Environmental power generation device and system for evaluating deterioration and health diagnosis

Abstract

To provide an environmental power generation device that is self-sustaining and long-term stable with respect to detecting displacement and evaluating deterioration of bridge beam structures, and a system for evaluating deterioration and health diagnosis.SOLUTION: An environmental power generation device 1 includes: a support body 101 installed on a bridge beam structure St; an elastic body 102 supported by the support body 101; a magnetic body 41 having a first magnetic field R1 operatively sandwiched between the elastic body 102 in a substantially vertical direction Z; and a coil 31 fixed and supported to the support body 101 in the first magnetic field R1, in which the coil 31 generates a current according to an inertial motion of the magnetic body 41 based on displacement and deterioration of the bridge beam structure St. A system for evaluating deterioration and health diagnosis includes: an environmental power generation device 1; and a deterioration information generation unit that generates deterioration information corresponding to power generation information by referring to a database in which reference power generation information corresponding to the power generation information indicating the status of power generation by the environmental power generation device 1 and reference deterioration information corresponding to the deterioration information of the bridge beam structure St are linked and stored in advance.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an energy harvesting device that generates power by inertial motion based on deformation or displacement of a bridge structure, and a degradation evaluation and soundness diagnosis system. [Background technology]

[0002] Currently, research is being conducted on energy harvesting devices that utilize the vibrations of bridge structures. Bridges, road bridges, viaducts, railway bridges, and other bridge structures make up a large part of Japan's social infrastructure, with at least tens of thousands of them in Japan alone. However, these bridge structures are subject to deterioration and natural disasters, and extending the lifespan of bridge structures through diagnostics is an important issue in terms of ensuring the convenience and living environment of the region. In this context, there is a strong need to realize efficient methods for evaluating the deterioration and diagnosing the soundness of bridge structures, as this would contribute greatly to local industries and finances.

[0003] Patent Document 1 discloses a vibration power generation device that converts the kinetic energy of a weight that moves significantly in resonation with the vibration of a bridge structure (structure such as a bridge) into electrical energy. Patent Document 2 discloses a vibration-damping power generation device that converts the vibration energy generated in a bridge structure (structure) into electrical energy using a dynamic mass type vibration damping device. By combining such energy harvesting devices with sensors for deterioration assessment, it is possible to realize an independent and long-term stable deterioration assessment and soundness diagnosis system, and to improve the efficiency of deterioration assessment for bridge structures for which it is difficult to secure a power source. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-207646 A [Patent Document 2] JP 2017-089559 A Summary of the Invention [Problem to be solved by the invention]

[0005] According to the vibration power generation device disclosed in Patent Document 1, the up and down movement of the driven body linked to the weight is converted into rotational motion, so that power can be generated efficiently based on the vibration of the bridge structure. Also, according to the vibration-damping power generation device disclosed in Patent Document 2, vibration energy can be converted into electrical energy and vibration of the bridge structure can be damped. However, the power generation devices disclosed in Patent Documents 1 and 2 convert the vibration energy of the bridge structure into rotational motion based on the power generation status of the power generation device, or damp the vibration with a vibration damping device, so that deformation (deflection) due to the vibration of the bridge structure cannot be accurately identified. For this reason, the power generation devices disclosed in Patent Documents 1 and 2 cannot evaluate deterioration based on whether the deformation of the bridge structure is abnormal, for example.

[0006] The present invention has been devised in consideration of the above-mentioned problems, and its object is to provide an environmental power generation device, and a deterioration evaluation and soundness diagnosis system that are independent and stable over the long term and have improved evaluation accuracy for the deterioration evaluation of bridge structures. [Means for solving the problem]

[0007] The environmental power generation device of the first invention comprises a support body installed on a bridge structure, an elastic body supported by the support body, a magnetic body having a first magnetic field that is held by the elastic body so as to be movable in a substantially vertical direction, and a coil fixedly supported by the support body within the first magnetic field, wherein the coil generates electricity by generating a current in response to the inertial motion of the magnetic body due to deformation or displacement of the bridge structure.

[0008] The energy harvesting device of the second invention is characterized in that, in the first invention, it further comprises a hard magnetic body fixed and supported by the support body, and the magnetic body is a soft magnetic body that is freely sandwiched within a second magnetic field possessed by the hard magnetic body.

[0009] The energy harvesting device according to a third aspect of the present invention is the energy harvesting device according to the first aspect of the present invention, characterized in that the magnetic body is a hard magnetic body.

[0010] The environmental power generation device of the fourth invention is characterized in that, in the first invention, it further comprises a vibrator that is provided on the surface or inside of the movable part and generates pseudo noise based on a pseudo noise signal received from the outside to move the movable part.

[0011] The environmental power generation device of the fifth invention comprises a support body installed on a bridge structure, a magnetic body having a first magnetic field fixedly supported by the support body, an elastic body supported by the support body, and a coil clamped to the elastic body so as to be movable in an approximately vertical direction within the first magnetic field, wherein the coil generates electricity by generating a current in association with its own inertial motion due to deformation or displacement of the bridge structure.

[0012] The deterioration assessment and soundness diagnosis system of the sixth invention is a deterioration assessment and soundness diagnosis system for assessing the deterioration of a bridge structure, and is characterized in comprising: an environmental power generation device described in any of the first to fifth inventions installed on the bridge structure; and a deterioration information generation unit that generates the deterioration information corresponding to the power generation information by referring to a database in which reference power generation information corresponding to power generation information indicating the status of power generation by the environmental power generation device and reference deterioration information corresponding to deterioration information indicating the attributes of the deterioration of the bridge structure are linked and stored in advance.

[0013] The deterioration assessment and health diagnosis system of the seventh invention is characterized in that, in the sixth invention, the deterioration information generation unit receives the power generation information as an input and generates the deterioration information using a deterioration information model that has been pre-trained using the reference power generation information and the reference deterioration information as teacher data. Effect of the Invention

[0014] According to the first and second inventions, a magnetic body having a first magnetic field that is clamped so as to be movable in a substantially vertical direction, and a coil fixedly supported within the first magnetic field are provided. The coil generates electricity by generating a current in response to the inertial motion of the magnetic body based on the deformation of the bridge structure. Therefore, while using the electricity generated based on the deformation of the bridge structure as power, it is possible to accurately identify the degree of deformation of the bridge structure from the power generation situation. This makes it possible to achieve independence and long-term stabilization as well as improved evaluation accuracy for deterioration evaluation of bridge structures by a deterioration evaluation and soundness diagnosis system using an environmental power generation device.

[0015] In particular, according to the second aspect of the present invention, the hard magnetic body is fixed to and supported by the support, and the magnetic body is a soft magnetic body that is movably sandwiched within the second magnetic field of the hard magnetic body. This allows a wider variety of soft magnetic bodies to be used, thereby improving the manufacturability of the energy harvesting device.

[0016] In particular, according to the third aspect of the present invention, the magnetic body movably sandwiched between the elastic body is a hard magnetic body. Therefore, there is no need to provide a hard magnetic body in the core part of the fixed part, which has a more complex shape than the movable part. This improves the manufacturability of the energy harvesting device.

[0017] In particular, according to the fourth aspect of the present invention, the bridge structure further includes a vibrator that generates pseudo noise based on a pseudo noise signal received from the outside to move the moving part. Therefore, even if the bridge structure is a large infrastructure structure, it is possible to obtain a repeatable and precise transmission characteristic that can be used to calibrate the sensitivity of the energy harvesting device to the deformation or displacement of the bridge structure. This makes it possible to further improve the evaluation accuracy of deterioration evaluation using the energy harvesting device and deterioration evaluation of the bridge structure by the soundness diagnosis system.

[0018] According to the fifth aspect of the present invention, a bridge structure is provided with a magnetic body having a fixedly supported first magnetic field, and a coil that is held within the first magnetic field so as to be movable in a substantially vertical direction. The coil generates electricity by generating a current due to its own inertial motion based on the deformation of the bridge structure. Therefore, while using the electricity generated based on the deformation of the bridge structure as its power source, the degree of deformation of the bridge structure can be accurately identified from the power generation situation. This makes it possible to achieve independence and long-term stabilization as well as improved evaluation accuracy for deterioration evaluation of bridge structures by a deterioration evaluation and soundness diagnosis system using an environmental power generation device.

[0019] According to the sixth to seventh inventions, the bridge structure is provided with an energy harvesting device according to the first to third inventions, which is installed on the bridge structure, and a deterioration information generating unit that generates deterioration information corresponding to the power generation information of the energy harvesting device by referring to a database in which reference power generation information and reference deterioration information are linked and stored in advance. Therefore, while using the power generated based on the deformation of the bridge structure as power source, it is possible to accurately identify the degree of deformation of the bridge structure from the power generation situation. This makes it possible to improve the accuracy of the deterioration evaluation of the bridge structure while achieving independence and long-term stabilization.

[0020] In particular, according to the seventh aspect of the present invention, the deterioration information generating unit receives power generation information as an input, and generates deterioration information using a deterioration information model that has been trained in advance using the reference power generation information and the reference deterioration information as teacher data. This allows for a more diverse evaluation of the degree of deterioration corresponding to the degree of deformation of the bridge structure. This improves the convenience of the deterioration evaluation of the bridge structure. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1(a) is a schematic diagram showing an example of the configuration of a degradation assessment and health diagnosis system in the first embodiment, and FIG. 1(b) is a schematic diagram showing an example of the detailed configuration of the degradation assessment and health diagnosis system. [Diagram 2]FIG. 2(a) is a schematic diagram showing an example of the configuration of an environmental power generation device in the degradation evaluation and health diagnosis system in the first embodiment, and FIG. 2(b) to FIG. 2(e) are schematic diagrams showing first to fourth modified examples of the configuration of the environmental power generation device. [Diagram 3] 3(a) to 3(d) are schematic diagrams showing fifth to seventh modified examples of the configuration of the energy harvesting device in the degradation assessment and soundness diagnosis system according to the first embodiment. [Figure 4] FIG. 4 is a schematic diagram showing an example of the configuration of a server in the degradation assessment and soundness diagnosis system in the first embodiment. [Diagram 5] FIG. 5 is a flowchart showing an example of the operation of the degradation evaluation and soundness diagnosis system in the first embodiment. [Figure 6] 6(a) and 6(b) are schematic diagrams showing an example of information accompanying the operation of the degradation assessment and soundness diagnosis system in the first embodiment. [Figure 7] FIG. 7 is a schematic diagram showing an example of a detailed configuration of the degradation evaluation and soundness diagnosis system in the second embodiment. [Figure 8] FIG. 8(a) is a schematic diagram showing an example of a learning method of the degradation assessment and health diagnosis system in the second embodiment, and FIG. 8(b) is a schematic diagram showing an example of the operation of the degradation assessment and health diagnosis system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An example of an environmental power generation device 1 and a degradation evaluation and health diagnosis system 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings. In each drawing, a vertical direction is Z, one direction perpendicular to the vertical direction Z is a first horizontal direction X, and a direction perpendicular to both the vertical direction Z and the first horizontal direction X is a second horizontal direction Y. The configurations in each drawing are shown diagrammatically for the purpose of explanation, and for example, the size of each component and the size comparison between the components may differ from those in the drawings.

[0023] (First embodiment: Energy harvesting device 1) An example of an energy harvesting device 1 according to this embodiment will be described with reference to the drawings.

[0024] 1(a), for example, the energy harvesting device 1 is installed in a part of a bridge structure St with large amplitude or vibration (including the front or back surface of the girders and beams that constitute the bridge), and constitutes a part of a deterioration evaluation and soundness diagnosis system 100 described below for evaluating the deterioration and soundness of the bridge structure St. Some components of the energy harvesting device 1 are freely movable, and the energy harvesting device 1 can generate power by inertial motion based on the vibration or periodic deformation of the bridge structure St caused by a vehicle C or the like running over the bridge structure St.

[0025] Here, the inertial motion of the energy harvesting device 1 refers to the motion of a freely supported magnetic body (or coil) included in the energy harvesting device 1, following the deformation (bending) or displacement (change in coordinates due to bending of surrounding members) of the bridge structure St, with a phase different from the phase of the deformation of the bridge structure St. In the energy harvesting device 1, the freely supported magnetic body (or coil) moves inertially (almost stationary in an inertial system) with respect to a fixedly supported coil (or magnetic body), generating a current in the coil by electromagnetic induction. Based on this principle, the energy harvesting device 1 generates power based on the deformation of the bridge structure St. In other words, the energy harvesting device 1 is different from a resonant type energy harvesting device that moves at the same frequency as the frequency of the deformation by following the deformation of the bridge structure St.

[0026] The bridge structure St includes structures that constitute a bridge, such as bridge girders, decks, piers, abutments, and bearings.

[0027] The deformation of the bridge structure St includes, for example, the deflection of the bridge girder and deck in the vertical direction Z due to the running of a vehicle C on the bridge structure St, the deformation of any of the piers, abutments, and supports linked to the deflection of the bridge girder and deck, or the displacement associated with the deformation of adjacent members. Specifically, the deflection of the bridge girder and deck includes, for example, a deformation including a vertically downward displacement caused by a downward load in the vertical direction Z acting as a compressive force on the bridge girder and deck extended along the first horizontal direction X and the second horizontal direction Y, and a deformation including a vertically upward displacement in an area acting as a tensile force due to a bending moment caused by the action of the load. In addition, the deformation of any of the piers, abutments, and supports includes, for example, a deformation including a vertically downward displacement caused by a compressive force acting in conjunction with the deflection of the bridge girder and deck, and a deformation including a vertically upward displacement caused by a tensile force. In addition, the displacement of any of the piers, abutments, and supports includes, for example, the displacement occurring when an adjacent component changes position without being deformed itself due to the deformation of the component itself caused by the action of compressive or tensile force.

[0028] Moreover, the bridge structure St deforms at a speed or acceleration corresponding to the vibration, thereby keeping a part of the energy harvesting device 1 in a nearly stationary state due to inertia. The bridge structure St also changes the direction of the speed or acceleration in response to vibration applied from the outside. At this time, a part of the energy harvesting device 1 performs inertial motion that follows the change in the direction of the speed or acceleration of the bridge structure St with a delay. In other words, unlike conventional displacement sensors or acceleration sensors that identify the displacement of the bridge structure St, the energy harvesting device 1 functions as a sensor that identifies the difference in the speed or acceleration of the displacement of the bridge structure St with the movement of a weight (movable part 4 described later) in a quasi-stationary state due to inertia as the amount of power generation. Therefore, unlike a resonant sensor that is related to the frequency of the movement of the bridge structure St, it can generate power regardless of the frequency of vibration.

[0029] Here, we will explain the relationship between the deformation of the bridge structure St and the power generation of the energy harvesting device 1. When a load is applied vertically downward to the bridge structure St, the amount of vertical downward displacement is σ, the damping ratio of the vibration of the bridge structure St is θ, and the power generation efficiency of the energy harvesting device 1 is f, the power generation amount W of the energy harvesting device 1 can be expressed by the following formula (1). Note that the amount of displacement σ of the bridge structure St is assumed to be the same value as the amount of displacement of the inertial magnetic body (or coil) that the bridge structure St is equipped with.

[0030]

number

[0031] Since the vibrations caused by traffic on the bridge structure St, including the movement of vehicle C, have a frequency much higher than the natural frequency of the bridge structure St, the traffic volume on the bridge structure St can be estimated using the above-mentioned power generation amount W.

[0032] Next, the relationship between the deterioration of the bridge structure St and the power generation of the energy harvesting device 1 will be described. If some defect occurs in the structure of the bridge structure St and its strength decreases, the displacement amount σ increases under the same load conditions, and as a result, the power generation amount W increases. In other words, by monitoring the power generation amount W under the same load conditions, it is possible to identify a value corresponding to the current strength of the bridge structure St. This makes it possible to evaluate the deterioration of the bridge structure St.

[0033] In order to identify the deterioration of the bridge structure St by taking into account the change and magnitude of the traffic volume on the bridge structure St, the power generation amount W corresponding to the deformation of the bridge structure St is calculated as shown in the following equation (2). b is the amount of power generated in response to traffic-related vibrations, W e The deterioration of the bridge structure St can be evaluated by using the bridge strength parameter S divided by . The bridge strength parameter S is a dimensionless value of the power generation per unit traffic volume.

[0034]

number

[0035] In addition, as shown in the following formula (3), the amount of generated power W b The cumulative amount of power generation for one month is W b add , power generation W e The cumulative amount of power generation for one month is W e add The integrated bridge strength parameter S for the one-month evaluation period is add The deterioration of the bridge structure St can be evaluated by using the integrated bridge strength parameter S add may be an integrated amount for less than one month or more than one month, and may indicate an integrated amount for any period.

[0036]

number

[0037] In the long-term monitoring of a bridge structure St, if sudden damage or unexpected deterioration occurs, such as a large earthquake, a rise in the river level, or scouring of a bridge pier, the bridge strength parameter S or the integrated bridge strength parameter S add shows an abnormally high value. In other words, when the bridge strength parameter S continues to increase or decrease over the long term, or when the integrated bridge strength parameter S add If the bridge strength parameter S continues to increase or decrease continuously every month, it can be determined that some change has occurred in the bridge structure St, and this can serve as an indicator for on-site observation by workers. Since it is difficult to calculate the initial value of the bridge strength parameter S of the bridge structure St, by monitoring the change over time of the bridge strength parameter S in this manner, it is possible to improve the efficiency of long-term monitoring of the bridge structure St. Note that the change in the bridge structure St may be automatically determined by comparing the amount of change in the bridge strength parameter S with a preset parameter in a deterioration assessment and soundness diagnosis system 100 described below that uses the environmental power generation device 1. Note that the bridge strength parameter S may be determined by comparing the amount of change in the bridge strength parameter S with a preset parameter in a deterioration assessment and soundness diagnosis system 100 described below that uses the environmental power generation device 1. b The average amount of electricity generated in a month is W b ave , power generation W e The average amount of electricity generated in a month is W e aveAs the average power generation amount W b ave The average power generation W e ave The average bridge strength parameter S during the one-month evaluation period is calculated by dividing ave may also be used.

[0038] The energy harvesting device 1 of the present invention can generate power in response to a wide range of vibration frequencies below 1 kHz and large amplitudes below 3 mm for vibrations of a bridge structure St. Simple measurements confirmed that the energy harvesting device 1 outputs a voltage value of 1 mV or more and a current value of 1 μA with a vibration of 1 Hz, and depending on the conditions, it is possible to generate a voltage value of 10 V and an amount of power of 1 Wh. Therefore, the energy harvesting device 1 can supply the power required for remote monitoring of the operation of the energy harvesting device 1, such as obtaining information indicating the power generation status and wireless communication.

[0039] That is, the energy harvesting device 1 can acquire information indicating its own power generation status and transmit the acquired information to an external storage device using the power obtained by power generation as a motive force. In this case, the energy harvesting device 1 may have a known current sensor, voltage sensor, data logger, etc. that has a function of acquiring information on the power generation status from the external storage device and wirelessly transmitting it to the external storage device. This allows the energy harvesting device 1 to function as a standalone monitoring device.

[0040] The induced current in the coil due to electromagnetic induction exhibits a larger current value the faster the relative motion between the magnetic body and the coil, or the larger the amplitude of the periodic motion. That is, the energy harvesting device 1 can obtain the parameters of the relative motion between the magnetic body and the coil by performing a back calculation from the information indicating the power generation status, and specify this as the degree of deformation of the bridge structure St. This cannot be realized by conventional power generation devices that convert vibration energy, vibration control devices that attenuate it, and resonant power generation devices that amplify it.

[0041] By using such a standalone energy harvesting device 1 for deterioration evaluation of a bridge structure St, it is possible to significantly shorten the time required for the deterioration evaluation of the bridge structure St, simplify and reduce the labor required, and reduce the cost required. Furthermore, in the event of a disaster, the wireless communication function of the energy harvesting device 1 can be used to remotely obtain information indicating the power generation status, allowing instantaneous evaluation of the presence or absence of damage to the bridge structure St and its soundness, thereby significantly supporting the promotion of disaster recovery.

[0042] The energy harvesting device 1 only needs to be able to cause the power generation component (the power generation unit 13 described below) to undergo inertial motion based on the deformation or displacement of the bridge structure St, and can generate power without needing to be firmly fixed to the bridge structure St. The energy harvesting device 1 may be placed on the bridge structure St without using, for example, known mounting fixtures or the like.

[0043] The energy harvesting device 1 may transmit power generation information indicating the status of its own power generation to the server 2 that can be wirelessly connected via the communication network 9, for example.

[0044] 1(b), the energy harvesting device 1 includes a communication unit 11, a storage unit 12, a power generation unit 13, and an acquisition unit 14. For example, the above-mentioned known current sensors, voltage sensors, data loggers, storage media, etc. may be used as the communication unit 11 and the storage unit 12. Furthermore, these known current sensors and voltage sensors may function as the acquisition unit 14 that acquires information indicating the status of power generation by the power generation unit 13.

[0045] The shape of the energy harvesting device 1 is a rectangular parallelepiped or a cylindrical body. The dimensions of the energy harvesting device 1 are, for example, a rectangular parallelepiped shape with a width in the first horizontal direction X of about 4 to 8 cm, a depth in the second horizontal direction Y of about 1 to 2 cm, and a height in the vertical direction Z of about 3.8 to 7.6 cm. The dimensions of the energy harvesting device 1 may be, for example, a perfect circle with a diameter of 18 to 36 cm in a plane direction including the first horizontal direction X and the second horizontal direction Y, and a cylindrical shape with a height in the vertical direction Z of about 20 to 40 cm. The shape and dimensions of the energy harvesting device 1 are arbitrary as long as they can be installed on a bridge structure St.

[0046] <Communications Division 11> The communication unit 11 may transmit power generation information indicating the status of power generation to the server 2 connected via, for example, a communication network 9. The communication unit 11 may transmit, for example, information acquired, generated, or stored by each component of the energy harvesting device 1 to the server 2 via the communication network 9. The communication unit 11 may receive, for example, information acquired, generated, or stored by the server 2 via the communication network 9.

[0047] <Storage section 12> The storage unit 12 stores, for example, information acquired or generated by each component of the energy harvesting device 1 in a storage device stored in a data logger or the like as necessary. The storage unit 12 retrieves, for example, various pieces of information stored in the storage device as necessary.

[0048] <Power Generation Division 13> The power generating unit 13 generates power by inertial motion based on the displacement of the bridge structure St.

[0049] As shown in FIG. 2(a), for example, the power generating unit 13 is composed of a fixed unit 3 fixedly supported by a support 101 and a movable unit 4 supported by the support 101 so as to be freely movable. At least a part of the fixed unit 3 is composed of either the coil 31 or the magnetic body 41, and at least a part of the movable unit 4 is composed of the other of the coil 31 and the magnetic body 41. In this case, the power generating unit 13 can generate power by a method in which the coil 31 or the magnetic body 41 constituting the movable unit 4 moves inertially relative to the coil 31 or the magnetic body 41 constituting the fixed unit 3 in the first magnetic field R1 possessed by the magnetic body 41 due to displacement of the bridge structure St, thereby generating an induced current in the coil 31 by electromagnetic induction.

[0050] <Acquisition part 14> The acquisition unit 14 acquires information relating to the status of power generation by the power generation unit 13 .

[0051] Next, a detailed example of the configuration of the energy harvesting device 1 will be described. As shown in Fig. 2(a), the energy harvesting device 1 includes a support 101, an elastic body 102, a fixed part 3, and a movable part 4. The energy harvesting device 1 may further include a power storage unit 5, for example.

[0052] <Support 101> The support 101 is installed on the bridge structure St. The shape of the support 101 may be a box shape or a frame structure with the inside exposed, as long as the shape and rigidity are such that the displacement of the bridge structure St can be transmitted to the inside of the support 101.

[0053] The material of the support 101 is, for example, a non-magnetic material having a large elastic constant, a small temperature coefficient of thermal expansion and the like, and high strength and toughness, and may be, for example, a plastic specified in "JIS K 6899-1," an aluminum alloy, a copper alloy, a titanium alloy, carbon, glass, other metal alloys (lead, zinc, tin, gold, silver, platinum, etc.), ceramics, or a composite material of these. In addition, the surface (outer surface or inner surface) of the support 101 may be provided with a soft magnetic material as a magnetic shield to avoid the influence of magnetism from the outside in the installation environment, or may be provided with a known coating material to improve weather resistance.

[0054] <Elastic body 102> The elastic body 102 is supported by a support 101 .

[0055] The elastic body 102, by clamping the movable part 4, can move the movable part 4 in an approximately uniaxial direction based on the deformation or displacement of the bridge structure St. Compared to a case where the movable part 4 is moved in an approximately uniaxial direction using the repulsive force of a pair of known permanent magnets, the elastic body 102 has a higher efficiency in converting the deformation or displacement of the bridge structure St into motion in an approximately uniaxial direction. In addition, there is no concern about variations in the magnetic force of the permanent magnets or deterioration. Since the environmental power generation device 1 is used to evaluate the deterioration of the bridge structure St based on the degree of the deformation or displacement, it is preferable to employ the elastic body 102, which has excellent motion conversion efficiency and reliability.

[0056] 2(a), the elastic body 102 is composed of a first compression spring 102a and a second compression spring 102b. One end of each of the first compression spring 102a and the second compression spring 102b is supported by the support 101, and the other end is connected to the movable part 4. Here, the compression spring includes a cylindrical spring (cylindrical coil spring), a conical spring (conical coil spring), a barrel spring (barrel coil spring), and a drum spring (drum coil spring).

[0057] The elastic body 102 is selected so as to have a natural frequency corresponding to the natural frequency of the material of the support 101 during free vibration. Here, the natural frequency of the elastic body 102 (or the natural frequency of the combination of the elastic body 102 and the movable part 4) is preferably lower than the natural frequency of the support 101. The reason is that when the natural frequency of the elastic body 102 is equal to the natural frequency of the support 101, the movable part 4 sandwiched between the elastic bodies 102 resonates with the vibration of the bridge structure St via the support 101. In addition, when the natural frequency of the elastic body 102 is higher than the natural frequency of the support 101, the movable part 4 moves following the vibration of the bridge structure St, resulting in a low power generation efficiency. Therefore, the elastic body 102 needs to have a natural frequency lower than the natural frequency of the movable part 4 in order to realize the inertial motion of the movable part 4 relative to the support 101.

[0058] For example, when the natural frequency of the bridge structure St is about 4 to 5 Hz, the natural frequency of the elastic body 102 is preferably 3 Hz or less. The material of the elastic body 102 is preferably a material that satisfies the above-mentioned natural frequency conditions. In order to lower the natural frequency of the elastic body 102, the smaller the spring constant of the material of the elastic body 102, the more preferable.

[0059] The first compression spring 102a and the second compression spring 102b may be, for example, a conical spring that extends in the winding axis direction and decreases in diameter toward the movable part 4. That is, the movable part 4 is more likely to move with a smaller external force than with a cylindrical spring or the like. Therefore, the movable part 4 is more likely to move in the vertical direction Z based on the displacement of the bridge structure St. This can improve the power generation efficiency of the energy harvesting device 1.

[0060] <Fixed part 3> The fixed part 3 is fixedly supported by the support 101. The fixed part 3 is, for example, composed of a coil 31 and a base 32, and the coil 31 is wound around the base 32. As shown in Figs. 2(a) to 2(d), the base 32 of the fixed part 3 is composed of a core part having a cross section obtained by cutting out a part of a substantially polygonal ring, a U-shape or a Y-shape, and a connecting part that connects the core part to the support 101 and supports it. For example, the coil 31 is wound around a part of the core part of the fixed part 3.

[0061] The material of the connecting portion of the base 32 of the fixed portion 3 is, for example, a non-magnetic material, and may be the same as the material of the support 101. The material of the core portion of the base 32 of the fixed portion 3 is, for example, a soft magnetic material. Here, the soft magnetic material is, for example, soft iron or ceramics capable of forming a magnetic circuit. The arrows shown in Figures 2(a) to 2(d) indicate the magnetic circuit formed by the magnetic body 41, which is a hard magnetic material (soft magnetic material), and the core portion of the soft magnetic material (hard magnetic material) of the fixed portion 3, and the direction of the magnetic field.

[0062] 2(a) to 2(d), it is preferable that the width J of the notch formed by cutting out a part of the substantially polygonal ring-shaped core portion of the fixed portion 3 is substantially the same as the width K of the magnetic body 41 in the vertical direction Z. The reason for this is that when the amplitude of the movable portion 4 (magnetic body 41) is smaller than |JK|, almost no induced current is generated, and power generation efficiency decreases. In other words, the closer |JK| is to 0, the greater the sensitivity to vibrations of the bridge structure St, and the more accurate the deterioration evaluation of the bridge structure St can be improved.

[0063] <Coil 31> The coil 31 is fixedly supported by the support 101. In this embodiment, the coil 31 is provided on the fixed portion 3, and thereby fixedly supported by the support 101.

[0064] The coil 31 may be made of a known material such as copper wire.

[0065] <Movable part 4> The movable part 4 is clamped between the elastic bodies 102 so as to be movable in the approximately vertical direction Z. The movable part 4 performs inertial motion based on the deformation or displacement of the bridge structure St transmitted via the support body 101. Note that the inertial motion of the movable part 4 refers to motion in which the movable part 4 maintains an approximately stationary state in the inertial system.

[0066] At least a part of the movable part 4 is made of a magnetic body 41, for example. The material of the base body 42 (42a, 42b), which is the part of the movable part 4 other than the magnetic body 41, may be, for example, a non-magnetic material or a soft magnetic material. The material of the movable part 4 is preferably one having a lower natural frequency than the support 101. The reason for this is the same as the condition for the natural frequency of the elastic body 102 described above. In order to further reduce the natural frequency of the movable part 4, it is preferable that the material of the movable part 4 has a larger weight or specific gravity.

[0067] When the natural frequency of the bridge structure St is greater than the natural frequency of the movable part 4, the movable part 4 is not substantially displaced in the vertical direction Z due to inertial force regardless of the displacement of the bridge structure St. In other words, the movable part 4 is kept substantially stationary in the inertial system even while the bridge structure St and the support 101 are vibrating.

[0068] Here, in the prior art, there is a vibration damping device that uses an inertial top that utilizes inertial motion. In the energy harvesting device 1 of the present invention, the movable part 4 that moves inertially weighs in the order of several kilograms. Furthermore, the bridge structure St that is the subject of evaluation weighs more than 100 tons, which is more than 10,000 times the weight of the energy harvesting device 1. For this reason, it can be considered that the inertial motion of the energy harvesting device 1 has no effect of damping the vibration of the bridge structure St.

[0069] Furthermore, although the power generation efficiency of the resonant power generation element of the prior art is high at the same frequency as the vibration of a bridge or the like, in order to resonate at a low frequency of about 3 Hz, it is time-consuming to fine-tune the selection of materials for the spring part corresponding to the elastic body 102 and the weight part corresponding to the movable part 4. Furthermore, when a dump truck or heavy machinery weighing 20 tons or more, which corresponds to 10% or more of the weight of the bridge, passes over the bridge, the natural frequency of the bridge changes, so it is not realistic to adjust the resonance frequency each time. Therefore, when generating power using the vibration of heavy objects such as infrastructure structures including bridges, a non-resonant method using inertial force like the energy harvesting device 1 is more advantageous than a resonance method.

[0070] Furthermore, the smaller the gap between the movable part 4 and the fixed part 3 (core part), the higher the power generation efficiency, but the stronger the tensile force of the fixed part 3 (core part) against the magnetic body 41 of the movable part 4, which may impede the inertial motion of the movable part 4. In this case, the movable part 4 may be provided with a non-magnetic gap holder 43 for maintaining the gap between the fixed part 3 and the movable part 4, for example, in the space between the fixed part 3 and the movable part 4 and on the surface of at least one of the fixed part 3 and the movable part 4. In this case, it is possible to prevent the movable part 4 from colliding with the fixed part 3 and being damaged. It is also possible to prevent the motion of the movable part 4 from being impeded by the fixed part 3. This makes it possible to suppress a decrease in the power generation efficiency of the energy harvesting device 1. For example, a non-magnetic ceramic bearing is used as the gap holder 43.

[0071] The movable part 4 may move based on, for example, a signal received by the energy harvesting device 1. In detail, the movable part 4 (magnetic body 41, base body 42) may be provided with a vibrator 6 on the surface or inside thereof, which vibrates in response to a received external signal, as shown in, for example, FIG.

[0072] The vibrator 6 is composed of, for example, an exterior 60, a weight 61, a connection part 62, and a voice coil motor 63. In the case of bridge inspection, the energy harvesting device 1 obtains the vibration (sound) transfer characteristics and transfer function when the floorboards, beams, etc. are sound in advance, and when there is a change in the transfer characteristics and transfer function acquired through the vibrator 6 at a later time, as in the conventional manual hammering inspection method, the floorboards, beams, etc. can be detected as having deteriorated or damaged. In other words, the sensitivity of the energy harvesting device 1 to the deformation or displacement of the bridge structure St can be calibrated. This makes it possible to further improve the evaluation accuracy of the deterioration evaluation using the energy harvesting device 1 and the deterioration evaluation of the bridge structure St by the soundness diagnosis system 100. Note that, as a prerequisite for realizing this, it is necessary to sufficiently ensure the theoretical understanding and reproducibility of the characteristics of the sound source (vibration source).

[0073] According to "Pseudorandom noise: On a New Real-Time Calibration Method for the Acoustic Emission Measurement System with Transducer, Specimen and Waveguide; Y.Higo, K.Takashima, S.Nunomura, H.Nakamura, A.Wada, Proceedings of the Fifth International Acoustic Emission Symposium, Tokyo, 1980, pp.103-114.", a periodic pseudo-noise shown in the following formula (4) may be used as a sound source for measuring the vibration transmission characteristics of such bridges. Here, t is time, m is the number of words, k is an integer, Φ is frequency, and Δt is the speed at which one word is read. According to this formula (4), when synthesizing with the number of words m, the pseudo-noise is a periodic pseudo-noise that reads 3072 words and synthesizes them repeatedly, and one period contains 511 frequencies, and each frequency Φ is made of 6 words. In addition, the phase of each frequency Φ is determined by a random number between 0 and 2π, creating a so-called white noise. In this case, the highest frequency of frequency Φ is 6 times Δt, and the lowest frequency (one period) is 3072 times Δt.

[0074]

number

[0075] The vibrator 6 receives a pseudo noise signal having a period with a frequency band including the sensitivity range of the voice coil motor 63 via a communication unit (not shown), and outputs pseudo noise corresponding to the pseudo noise signal to the voice coil motor 63 using the power storage unit 5 or the like as a power source. When the vibrator 6 is used in a degradation evaluation and soundness diagnosis system 100 (described later), the vibrator 6 may receive from the server 2 a pseudo noise signal that has been generated by the server 2 receiving an input from a user U.

[0076] When the voice coil motor 63 outputs the pseudo noise, it vibrates the weight 61 via the connection part. The exterior 60, the weight 61, and the connection part 62 may be made of a known non-magnetic material. The voice coil motor 63 may be a known voice coil motor. The vibrator 6 itself vibrates as the weight 61 vibrates.

[0077] The vibration of the vibrator 6 caused by this pseudo noise is transmitted through the exterior 60 to the movable part 4, and the movable part 4 moves based on the vibration. As a result, the coil 31 generates power in response to the movement of the movable part 4. At this time, the power generation result of the coil 31 at a first time point when the bridge structure St is sound is acquired, and then the power generation result of the coil 31 at a second time point when the bridge structure St is sound is acquired and compared with the power generation result at the first time point, thereby calibrating the sensitivity of the energy harvesting device 1 to the deformation or displacement of the bridge structure St. In other words, even if the bridge structure St is a large infrastructure structure, a repeatable and precise transmission characteristic can be acquired and used to calibrate the sensitivity of the energy harvesting device 1 to the deformation or displacement of the bridge structure St. This makes it possible to further improve the evaluation accuracy of the deterioration evaluation using the energy harvesting device 1 and the deterioration evaluation of the bridge structure St by the soundness diagnosis system 100.

[0078] The vibrator 6 may receive from the server 2 the above-mentioned pseudo noise, pseudo noise signal, or other speed or acceleration parameters as parameters corresponding to the speed or acceleration of the deformation of the bridge structure St input by the user U to the server 2, move the movable part 4 according to the parameters, and transmit information indicating the power generation status due to the movement to the server 2. In this case, a calibration process can be remotely performed to reduce the influence of the inertial motion of the energy harvesting device 1 and the power generation status on the increase or decrease of the power generation status due to the deterioration of the energy harvesting device 1 over time, including the deterioration of the elastic body 102. This can improve the long-term reliability of the deterioration evaluation using the energy harvesting device 1 and the deterioration evaluation of the bridge structure St by the soundness diagnosis system 100. The vibrator 6 may be provided on the surface or inside of the fixed part 3 or the support 101, and in this case, the calibration process can be remotely performed on the energy harvesting device 1 by the same method.

[0079] <Magnetic material 41> The magnetic body 41 is sandwiched between the elastic body 102 so as to be movable in the substantially vertical direction Z. In this embodiment, the magnetic body 41 is provided in the movable portion 4, and is thereby sandwiched between the support body 101 so as to be movable.

[0080] The magnetic body 41 is, for example, a hard magnetic body or a soft magnetic body that forms a magnetic circuit with the core part of the fixed part 3. That is, the energy harvesting device 1 generates power by generating a current in the coil 31 in association with the inertial motion of the magnetic body 41 based on the deformation or displacement of the bridge structure St. In this case, the degree of deformation of the bridge structure St can be accurately identified from the power generation situation while using the electric power generated based on the deformation of the bridge structure St as a power source. As a result, the deterioration evaluation of the bridge structure St by the deterioration evaluation and soundness diagnosis system 100 using the energy harvesting device 1 can be made independent and stabilized for a long time, and the evaluation accuracy can be improved. In addition, when a hard magnetic body is used as the hard magnetic body 41, it is not necessary to provide a hard magnetic body in the core part of the fixed part 3, which has a more complex shape than the movable part 4. As a result, the manufacturability of the energy harvesting device 1 can be improved.

[0081] A hard magnetic material such as a known permanent magnet is used as the magnetic material 41. As the hard magnetic material, a permanent magnet, a steel magnet, a ferrite magnet, a neodymium magnet, a samarium magnet, an alnico magnet, etc. are used.

[0082] <Storage unit 5> The power storage unit 5 takes in the current generated in, for example, the coil 31 and stores it. The power storage unit 5 is electrically connected to the coil 31 via, for example, a conductor 5a. The power storage unit 5 has, for example, a step-up transformer (not shown), and stores the current generated in the coil 31 after step-up rectification to a voltage required for storage. At this time, the environmental power harvesting device 1 may transmit to the server 2 a signal indicating the power generation result of the power generation unit 13 or a signal indicating the power storage result of the power storage unit 5. A known battery such as an electric double layer capacitor may be used as the power storage unit 5.

[0083] (First embodiment: modified example of energy harvesting device 1) The energy harvesting device 1 may further include a hollow body 110 for sliding the movable part 4 so that it moves in a substantially vertical direction Z, as shown in FIG. 2(b), for example. In this case, the inertial motion of the movable part 4 in directions other than the vertical direction Z can be inhibited, and the amount of displacement in one axis can be easily detected. This can improve the accuracy of displacement detection for use in deterioration evaluation of the bridge structure St. Note that, in order to suppress frictional resistance against the movable part 4, it is preferable that the hollow body 110 is subjected to a coating treatment with excellent slipperiness on the contact surface with the movable part 4 or that a ceramic ball bearing or the like is provided.

[0084] As shown in FIG. 2(b), the energy harvesting device 1 may have one or more hard magnetic bodies 33 (33a, 33b) provided on the fixed part 3. The hard magnetic body 33 has, for example, a second magnetic field R2. The magnetic body 41 is a soft magnetic body that is movably held by the second magnetic field R2. In this case, a wider variety of soft magnetic bodies can be used, and for example, inexpensive iron material or a ferrite-based magnetic body (soft ferrite) exhibiting soft magnetism can be used instead of a permanent magnet. This can improve the manufacturability of the energy harvesting device 1.

[0085] 2(c), the energy harvesting device 1 may have a plurality of coils 31a, 31b provided on the fixed part 3. Furthermore, since the voltage can be doubled by connecting the plurality of coils 31a, 31b in series, and the current can be doubled by connecting them in parallel, a function that enables adjustment of the voltage and current according to the power storage conditions can be expected.

[0086] In the example of Figure 2(c), an example is shown in which multiple coils 31a, 31b are electrically connected to each other via a conductor 5a, but multiple coils 31a, 31b that are not electrically connected to each other may also be provided.

[0087] 2(d), the energy harvesting device 1 may have a hard magnetic body 33 provided on the fixed part 3 and a coil 44 provided on the movable part 4. The coil 44 is provided by being wound around a base body 45 that is sandwiched between the elastic body 102 so as to be movable in the substantially vertical direction Z, for example, within a first magnetic field R1 generated by the hard magnetic body 33.

[0088] That is, the system includes a magnetic body (hard magnetic body 33) fixedly supported by a support 101 installed on the bridge structure St, and a coil 44 held by an elastic body 102 supported by the support 101 so as to be movable in the substantially vertical direction Z within a first magnetic field R1. The coil 44 generates electricity by generating a current due to inertial motion based on the deformation or displacement of the bridge structure St. In this case, the degree of deformation or displacement of the bridge structure St can be accurately identified from the power generation status while using the electric power generated based on the deformation or displacement of the bridge structure St as power. This makes it possible to achieve independence and long-term stabilization as well as improved evaluation accuracy for the deterioration evaluation of the bridge structure St by the deterioration evaluation and soundness diagnosis system 100 using the environmental power generation device 1.

[0089] In the energy harvesting device 1, the movable part 4 may be sandwiched between a first tension spring 102c and a second tension spring 102d, as shown in Fig. 3(a), for example. The movable part 4 shown in Fig. 3(a) may be supported by a compression spring from below. Although Fig. 3(a) shows an example in which one first tension spring 102c and one second tension spring 102d are used, it is preferable to provide more tension springs in parallel with the tension springs 102c and 102d, or to arrange a plurality of tension springs around the movable part 4, because this can restrict the movable part 4 from moving in a planar direction including the first horizontal direction X and the second horizontal direction Y, thereby improving the power generation efficiency of the energy harvesting device 1.

[0090] The fixed part 3 is supported above the support 101, for example, and extends downward. The fixed part 3 has, for example, a base 32a and a coil bobbin 32b of a generally cylindrical shape with an open lower end attached to the lower side of the base 32a, and the coil 31 is wound around the side of the coil bobbin 32b. In FIG. 3(a), for convenience of explaining the internal space of the coil bobbin 32b, a part of the side of the coil bobbin 32b is cut away. The coils 31c and 31d each show a part of a coil 31 having a circular ring shape in a plan view, as shown in the cross-sectional view and the perspective view of FIG. 3(b), for example. The base 32a and the coil bobbin 32b are both made of a non-magnetic material, such as plastic, aluminum, copper, brass, or lead.

[0091] The movable part 4 is composed of a base 410 of a soft magnetic material, hard magnetic bodies 41c and 41d of permanent magnets, and soft magnetic bodies 42c, 42d, and 42e. The hard magnetic bodies 41c and 41d and the soft magnetic body 42e extend upward from the base 410, for example. At this time, the hard magnetic bodies 41c and 41d cover the periphery of the coil bobbin 32b, and the soft magnetic body 42e is inserted into the coil bobbin 32b. The soft magnetic bodies 42c and 42d extend upward from the hard magnetic bodies 41c and 41d. Note that the hard magnetic bodies 41c and 41d are parts of one hard magnetic body 41 having a circular ring shape in a plan view, as shown in the cross-sectional view and the perspective view of FIG. 3(b), for example., and each of the soft magnetic bodies 42c and 42d is a part of one soft magnetic body 42 having a circular ring shape in a plan view. The coil 31 and the coil bobbin 32 of the fixed portion 3 are spaced apart from the base body 410, the hard magnetic bodies 41c and 41d, and the soft magnetic bodies 42c, 42d, and 42e, respectively.

[0092] At this time, the soft magnetic body 42 (42c, 42d) is magnetized to the N pole by the magnetic field of the hard magnetic body 41 (41c, 41d), and the base body 410 and the soft magnetic body 42e are magnetized to the S pole. As a result, a first magnetic field R1 is generated inside the movable part 4. At least one of the base body 410, the hard magnetic body 41, and the soft magnetic body 42 of the movable part 4 is sandwiched between the first tension spring 102c and the second tension spring 102d so as to be movable in the approximately vertical direction Z. Even when the support body 101 and the fixed part 3 (the coil 31 and the coil bobbin 32b) are displaced in the approximately vertical direction Z in response to the deformation or displacement of the bridge structure St, the movable part 4 is hardly displaced in the approximately vertical direction Z due to the inertial force. As a result, a current is generated in the coil 31.

[0093] The hard magnetic body 41 (41c, 41d) and the soft magnetic body 42 (42c, 42d) are positioned opposite to the outer surface of the coil bobbin 32b, and the soft magnetic body 42e is positioned on the inner surface of the coil bobbin 32. In detail, for example, as shown in the cross-sectional view and the perspective view of FIG. 3(b), the coil 31 and the coil bobbin 32b of the fixed part 3 and the magnetic bodies 41c, 41d, 41e, 42c, and 42d of the movable part 4 mesh with each other while maintaining a gap, or mesh with each other so as to slide. In this case, as with the above-mentioned hollow body 110, it is easy to hinder the inertial motion of the movable part 4 in a direction other than the vertical direction Z, and it is easy to detect the amount of displacement of one axis. This can improve the accuracy of displacement detection used for deterioration evaluation of the bridge structure St. It is preferable that the movable part 4 is separated from the coil 31 and the coil bobbin 32b of the fixed part 3 in order to maintain the power generation efficiency.

[0094] In the energy harvesting device 1, the movable part 4 may be supported above the support 101 via a third tension spring 102e for freedom of movement, as shown in, for example, FIG. 3(c). The movable part 4 may have, for example, a base 42c and a cylindrical coil bobbin 42d attached below the base 42c and having an open lower end, and a coil 44 (44c, 44d) is wound around the side surface of the coil bobbin 42d. In addition, the fixed part 3 may have a base 32f fixed to the support 101 via a support 32g below the movable part 4. The soft magnetic materials 32c, 32d, 32e, base 32f, and support 32g constituting the fixed part 3 correspond to the soft magnetic materials 42c, 42d, 42e, 410, and base 32a in the example of FIG. 3(a). The hard magnetic bodies 33c and 33d constituting the fixed portion 3 correspond to the hard magnetic bodies 41c and 41d in the example of Fig. 3(a). In this case, the material of the base body 42c and the coil bobbin 42d is, for example, a non-magnetic material, and although plastic, aluminum, copper, brass, lead, etc. may be used, a material with a high specific gravity is preferable for inertial motion, and it is particularly preferable to use copper, brass, lead, etc.

[0095] At this time, the magnetic field of the hard magnetic body 33 (33c, 33d) magnetizes the soft magnetic body 32 (32c, 32d) to the north pole, and the base body 32f and the soft magnetic body 32e to the south pole. As a result, a first magnetic field R1 is generated inside the movable part 4. The movable part 4 is sandwiched between the third tension spring 102e so as to be movable in the approximately vertical direction Z, and even when the support body 101 and the fixed part 3 (the coil 44 and the coil bobbin 42d) are displaced in the approximately vertical direction Z in response to deformation or displacement of the bridge structure St, the movable part 4 is hardly displaced in the approximately vertical direction Z due to inertial force. As a result, a current is generated in the coil 44.

[0096] For example, as shown in FIG. 3(d), a plurality of energy harvesting devices 1 (1a, 1b) may be provided in a bending region such as the bridge girder surface of the bridge structure St. In this case, by comparing the power generation status of the plurality of energy harvesting devices 1a, 1b, it is easier to identify the location of the bridge structure St where deterioration is estimated, compared to the case where one energy harvesting device 1 is used. Specifically, by identifying the energy harvesting device 1 with a larger increase over time in current value, voltage value, or power amount among the plurality of energy harvesting devices 1a, 1b, it is easier to identify the location of the bridge structure St where deterioration is estimated. This makes it possible to improve the accuracy of the deterioration evaluation of the bridge structure St. Furthermore, by connecting a plurality of energy harvesting devices 1 in series, it is possible to increase the output voltage when the vibration is cyclic. Furthermore, by connecting a plurality of energy harvesting devices 1 in parallel, it is possible to increase the output current when the vibration is cyclic.

[0097] Furthermore, for multiple energy harvesting devices 1, one energy harvesting device 1 applies vibration to the bridge structure St with the vibrator 6, and the power generation state of the other energy harvesting device 1 due to the vibration is obtained, thereby making it possible to determine the inter-device transfer characteristic (inter-device transfer function) between the multiple energy harvesting devices 1. Similarly, when there is a change in the measurement results at two points in time for the inter-device transfer characteristic, it is possible to detect that the floorboards, beams, etc. have deteriorated or been damaged. In other words, it is possible to calibrate the sensitivity of the energy harvesting device 1 to the deformation or displacement of the bridge structure St. This makes it possible to further improve the evaluation accuracy of the deterioration evaluation using the energy harvesting device 1 and the deterioration evaluation of the bridge structure St by the soundness diagnosis system 100.

[0098] Furthermore, by inputting a periodic pseudo-interference signal (periodic pseudo-interference signal) to any one of the multiple energy harvesting devices 1 and detecting the vibration generated by the other energy harvesting devices 1, it is possible to obtain a transfer function between the multiple energy harvesting devices 1. This makes it possible to grasp the presence or absence and the degree of deterioration or damage between the multiple energy harvesting devices 1.

[0099] (First embodiment: Degradation evaluation and soundness diagnosis system 100) Next, an example of a degradation assessment and health diagnosis system 100 using the energy harvesting device 1 of this embodiment will be described with reference to the drawings.

[0100] The degradation assessment and health diagnosis system 100 includes an energy harvesting device 1 and a server 2, as shown in, for example, FIGS.

[0101] <Server 2> The server 2 stores a database in which, for example, information corresponding to power generation information indicating the status of power generation by the energy harvesting device 1 and information corresponding to deterioration information indicating the attributes of deterioration of the bridge structure St are linked and stored in advance. The server 2 is communicatively connected to the energy harvesting device 1 via, for example, a communication network 9. The server 2 receives, for example, information acquired, generated, or stored by the energy harvesting device 1 from the energy harvesting device 1 via the communication network 9.

[0102] 4, the server 2 includes a housing 20, a CPU 201, a ROM 202, a RAM 203, a storage unit 204, and an I / F 205. The components 201 to 205 are connected by an internal bus 210. As the server 2, for example, a known electronic device such as a laptop (notebook) PC or a desktop PC is used.

[0103] The CPU 201 controls the entire server 2. The ROM 202 stores operation codes for the CPU 201. The RAM 203 is a working area used when the CPU 201 is operating. The storage unit 204 stores various information such as backups of the data stored in the ROM 202, databases, and learning target data. As the storage unit 204, for example, a data storage device such as an HDD or an SSD is used. For example, the server 2 may have a GPU (not shown). The I / F 205 is an interface for transmitting and receiving various information to and from the energy harvesting device 1 via the communication network 9 as necessary.

[0104] 1(b), the server 2 includes a server communication unit 21, a server storage unit 22, a degradation information generation unit 23, and a degradation information output unit 24. Each component of the server 2 is realized by a CPU 201 using a RAM 203 as a working area to execute a program stored in a ROM 202, a storage unit 204, etc.

[0105] <Server communication unit 21> The server communication unit 21 receives, for example, information acquired, generated, or stored by the energy harvesting device 1 via the communication network 9. The server communication unit 21 transmits, for example, information such as an operation control program for the energy harvesting device 1 to the energy harvesting device 1 via the communication network 9.

[0106] <Server storage unit 22> The server storage unit 22 stores, for example, information acquired or generated by each component of the server 2 in a database stored in the storage unit 204 as necessary. The server storage unit 22 retrieves, for example, various pieces of information stored in the database stored in the storage unit 204 as necessary.

[0107] <Deterioration information generation unit 23> The deterioration information generating unit 23 generates deterioration information of the bridge structure St corresponding to the power generation information of the environmental power generation device 1, by referring to a database in which information corresponding to the power generation information of the environmental power generation device 1 and information corresponding to the deterioration information of the bridge structure St are linked and stored in advance.

[0108] <Deterioration information output unit 24> The deterioration information output unit 24 outputs the deterioration information of the bridge structure St generated by the deterioration information generation unit 23. The deterioration information output unit 24 presents the deterioration information of the bridge structure St to the user U, for example, by outputting to the display unit 209.

[0109] <Communication Network 9> The communication network 9 is, for example, an Internet network to which the energy harvesting device 1 and the server 2 are connected via a communication circuit. The communication network 9 may be configured as a so-called optical fiber communication network. The communication network 9 may be realized by known communication technologies such as a wired communication network or a wireless communication network.

[0110] (First embodiment: Deterioration evaluation method) Next, an example of the operation of a degradation assessment and health diagnosis system 100 will be described with reference to the drawings as a degradation assessment method using the energy harvesting device 1 in this embodiment. The degradation assessment and health diagnosis system 100 is executed via a degradation assessment program installed in the energy harvesting device 1 and the server 2, for example.

[0111] The operation of the degradation assessment and soundness diagnosis system 100 includes, for example, a power generation step S11 and a degradation information generation step S12, as shown in Fig. 5. Note that, in the operation of the degradation assessment and soundness diagnosis system 100, the power generation step S11 may be performed multiple times, and the degradation information generation step S12 may be performed multiple times.

[0112] First, a description will be given of various information associated with the operation of the degradation assessment and health diagnosis system 100 in this embodiment. The various information handled by the degradation assessment and health diagnosis system 100 includes, for example, power generation information D1, degradation information D2, and a database D6 stored in the server 2, as shown in Fig. 6(a).

[0113] <Power Generation Information D1> The power generation information D1 is information indicating the status of power generation by the power generation unit 13. The power generation information D1 indicates an image of the bridge structure St acquired by the acquisition unit 14 functioning, for example, with a known current sensor and voltage sensor. The power generation information D1 includes, for example, the current value and voltage value of the current generated in the coil 31 by the power generation unit 13, or the amount of power actually stored in the power storage unit 5, etc.

[0114] <Deterioration information D2> The deterioration information D2 is information indicating the deterioration attributes of each member constituting the bridge structure St. Here, the deterioration attributes refer to information for identifying the details of the deterioration, such as the characteristics and properties of the deterioration of each material.

[0115] The deterioration information D2 includes, for example, the presence or absence of deterioration for each material, the name of the deterioration (including the official name, common name, and alias), the deteriorated part, deterioration feature amounts including the dimensions of the deteriorated part, the classification of the degree of deterioration (minor, significant, and the like), and other symbols for identifying the deterioration. The deterioration information D2 includes, for example, cracks, peeling, exposed rebar, water leakage, free lime, tilt, shifting, rust, cracks, breakage, loose screws, peeling paint, swelling, chalking, deformation, discoloration, and the like.

[0116] <Database D6> The database D6 is a collection of data stored in advance in the degradation assessment and soundness diagnosis system 100. The database D6 is stored in advance in the storage unit 204 of the server 2, for example.

[0117] The database D6 stores, for example, as shown in FIG. 6(a), a power generation information table T61 that stores pre-acquired reference power generation information D61, and a degradation information table T62 that stores pre-acquired reference degradation information D62.

[0118] 6(b), the database D6 stores each piece of information in the reference power generation information D61 and each piece of information in the reference degradation information D62 in association with each other. The database D6 may store, for example, information indicating daily power consumption (unit: Wh) included in the reference power generation information D61 and information indicating the presence or absence of degradation, the name of degradation, the deteriorated part, etc. included in the reference degradation information D62 in association with each other.

[0119] That is, the degradation evaluation and soundness diagnosis system 100 includes an energy harvesting device 1 and a degradation information generating unit 23 that generates degradation information D2 corresponding to the power generation information D1 of the energy harvesting device 1 by referring to a database D6 in which reference power generation information D61 and reference degradation information D62 are linked and stored in advance. In this case, the degree of deformation of the bridge structure St can be accurately identified from the power generation situation while using the power generated based on the deformation of the bridge structure St as power source. This makes it possible to improve the accuracy of the degradation evaluation of the bridge structure St while achieving independence and long-term stabilization.

[0120] In the reference power generation information D61, the daily power amount "a" may be linked to the deterioration presence / absence "yes" in the reference deterioration information D62, and the daily power amount "b" may be linked to the deterioration presence / absence "no" in the reference deterioration information D62. In addition, the reference power generation information D61 may be preset with specific values ​​such as the daily power amounts "a=a1" and "b=b1", or may be preset with threshold values ​​specified by two values ​​such as the daily power amounts "a=a1-a2" and "b=b1-b2".

[0121] In the reference power generation information D61, for the daily power amount "c", the presence or absence of degradation "Yes" in the reference deterioration information D62 may be linked to the degradation name "ca" and the degraded part "cb", and for the daily power amount "d", the presence or absence of degradation "Yes" in the reference deterioration information D62 may be linked to the degradation name "da" and the degraded part "db". Here, the degradation names "ca" and "da" may indicate the same content or different content. Also, the degraded parts "cb" and "db" may indicate the same content or different content.

[0122] <Power Generation Information Table T61> The power generation information table T61 stores reference power generation information D61, for example, as shown in FIG.

[0123] <Reference power generation information D61> The reference power generation information D61 is stored in advance in, for example, a power generation information table T61. The reference power generation information D61 is, for example, information corresponding to the power generation information D1, and may include information similar to the power generation information D1. Here, the information corresponding to the power generation information D1 refers to information indicating the status of power generation by the operation of another device having a similar configuration to the energy harvesting device 1 or another device that employs the principle of generating an induced current in a coil due to inertial motion.

[0124] For example, when incorresponding power generation information D1 is input or stored in any component of the degradation assessment and health diagnosis system 100, the reference power generation information D61 may be newly stored in the server 2 via the server memory unit 22 or the like, corresponding to the power generation information D1.

[0125] <Deterioration information table T62> The degradation information table T62 stores, for example, reference degradation information D62.

[0126] <Reference Deterioration Information D62> The reference degradation information D62 is stored in advance in, for example, a degradation information table T62. The reference degradation information D62 is, for example, information corresponding to the degradation information D2, and may include information similar to the degradation information D2. Here, the information corresponding to the degradation information D2 refers to information indicating an attribute of degradation detected by the operation of another device having a similar configuration to the energy harvesting device 1 or another device that employs the principle of generating an induced current in a coil due to inertial motion.

[0127] For example, when non-corresponding deterioration information D2 is input or stored in any configuration of the deterioration assessment and health diagnosis system 100, the reference deterioration information D62 may be newly stored in the server 2 via the server memory unit 22 or the like, corresponding to the deterioration information D2.

[0128] Next, the operation of the degradation assessment and soundness diagnosis system 100 in this embodiment will be described in detail.

[0129] <Advance preparation> Before operating the degradation assessment and soundness diagnosis system 100, the user U confirms that a database D6 in which reference power generation information D61 and reference degradation information D62 are linked and stored is saved in the server 2.

[0130] The user U also confirms that the energy harvesting device 1 is installed on the bridge structure St and is wirelessly connected to the server 2 that the user U operates.

[0131] <Power generation step S11> In a power generation step S11, the power generation unit 13 generates power based on the displacement of the bridge structure St. In detail, the power generation unit 13 generates power by generating a current in the coil 31 in association with the inertial motion of the magnetic body 41 based on the displacement of the bridge structure St.

[0132] Thereafter, the acquisition unit 14 acquires power generation information D1 indicating the status of power generation by the power generation unit 13. Thereafter, the server communication unit 21 receives, via the communication network 9, the power generation information D1 acquired in the power generation step S11 from the energy harvesting device 1.

[0133] <Deterioration information generating step S12> In the deterioration information generation step S12, the deterioration information generation unit 23 refers to a database D6 in which reference power generation information D61 and reference deterioration information D62 are linked and stored in advance, and generates deterioration information D2 corresponding to the power generation information D1 acquired in the power generation step S11.

[0134] After performing each of the above-mentioned steps, the operation of the degradation assessment and soundness diagnosis system 100 in this embodiment is completed. Note that the degradation assessment and soundness diagnosis system 100 may perform each of the above-mentioned steps repeatedly, for example.

[0135] According to this embodiment, the system includes a magnetic body 41 having a first magnetic field R1 that is movably held in an approximately vertical direction Z by an elastic body 102 supported by a support 101 installed on a bridge structure St, and a coil 31 that is fixedly supported by the support 101 within the first magnetic field R1. The coil 31 generates power by generating a current in association with the inertial motion of the magnetic body 41 based on the deformation of the bridge structure St. Therefore, while using the power generated based on the deformation or displacement of the bridge structure St as power, it is possible to accurately identify the degree of deformation of the bridge structure St from the power generation situation. As a result, the deterioration evaluation of the bridge structure St by the deterioration evaluation and soundness diagnosis system 100 using the environmental power generation device 1 can be made independent and stabilized for a long time, while improving the evaluation accuracy.

[0136] Moreover, according to this embodiment, the hard magnetic body 33 fixedly supported by the support 101 is further provided, and the magnetic body 41 is a soft magnetic body that is movably sandwiched within the second magnetic field R2 of the hard magnetic body 33. This allows a wider variety of soft magnetic bodies to be used, thereby improving the manufacturability of the energy harvesting device 1.

[0137] Furthermore, according to this embodiment, the magnetic body 41 movably held between the elastic bodies 102 is a hard magnetic body. Therefore, it is not necessary to provide a hard magnetic body in the core portion of the fixed part 3, which has a more complex shape than the movable part 4. This makes it possible to improve the manufacturability of the energy harvesting device 1.

[0138] Moreover, according to this embodiment, the system further includes a vibrator 6 that generates pseudo noise based on a pseudo noise signal received from outside to move the movable part 3. Therefore, even if the bridge structure St is a large infrastructure structure, it is possible to obtain a repeatable and precise transfer characteristic that can be used to calibrate the sensitivity of the energy harvesting device 1 to the deformation or displacement of the bridge structure St. This makes it possible to further improve the evaluation accuracy of the deterioration evaluation using the energy harvesting device 1 and the deterioration evaluation of the bridge structure by the soundness diagnosis system 100.

[0139] Moreover, according to this embodiment, the bridge structure St includes a magnetic body (hard magnetic body 33) fixedly supported by a support 101 installed on the bridge structure St, and a coil 44 held by an elastic body 102 supported by the support 101 so as to be movable in the substantially vertical direction Z within the first magnetic field R1. The coil 44 generates electricity by generating a current by its own inertial motion based on the deformation of the bridge structure St. Therefore, while using the electric power generated based on the deformation or displacement of the bridge structure St as its power source, the degree of deformation of the bridge structure St can be accurately identified from the power generation situation. As a result, the deterioration evaluation of the bridge structure St by the deterioration evaluation and soundness diagnosis system 100 using the environmental power generation device 1 can be made independent and stabilized for a long time, while improving the evaluation accuracy.

[0140] (Second embodiment: Degradation evaluation and soundness diagnosis system 100) An example of a degradation assessment and soundness diagnosis system 100 in this embodiment will be described with reference to the drawings. This embodiment differs from the first embodiment in that the degradation assessment and soundness diagnosis system 100 further includes a learning unit 25. Note that a description of the same configuration as that described above will be omitted.

[0141] <Server 2> The server 2 further includes a learning unit 25 .

[0142] <Study Section 25> The learning unit 25 generates a learning model using, as teacher data, information corresponding to the power generation information of the energy harvesting device 1 and information corresponding to the deterioration information of the bridge structure St. The learning unit 25 can generate or update the learning model using, for example, multiple pieces of teacher data.

[0143] (Second embodiment: Deterioration evaluation method) Next, the operation of the degradation assessment and health diagnosis system 100 using the energy harvesting device 1 in this embodiment will be described with reference to the drawings.

[0144] First, a description will be given of various information accompanying the operation of the degradation assessment and soundness diagnosis system 100 in this embodiment. The degradation assessment and soundness diagnosis system 100 uses a degradation information model D7, for example, as shown in Figs. 8(a) to 8(b).

[0145] <Deterioration information model D7> The deterioration information model D7 is a type of learning model used by the deterioration assessment and soundness diagnosis system 100 to automatically generate the deterioration information D2 of the bridge structure St.

[0146] 8(a), the degradation information model D7 is a learning model generated by learning in advance using a plurality of teacher data D70, with a data set being a set of input data D701 including reference power generation information D61 and output data D702 including reference degradation information D62 as teacher data D70. The degradation information model D7 may be generated by the learning unit 25, for example, or may be generated in advance and stored in the server 2.

[0147] The deterioration information model D7 is stored in a database D6, for example as shown in FIG. 8(b), and generates deterioration information D2 of the bridge structure St using power generation information D1 of the bridge structure St as an input.

[0148] That is, the deterioration information generating unit 23 receives the power generation information D1 as an input, and generates the deterioration information D2 using the deterioration information model D7 that has been trained in advance using the reference power generation information D61 and the reference deterioration information D62 as teacher data D70. This allows for a more diverse evaluation of the degree of deterioration corresponding to the degree of displacement caused by the bending of the bridge structure St. This improves the convenience of the deterioration evaluation of the bridge structure St.

[0149] The degradation information model D7 may include a regression model that is generated based on the analysis results by performing regression analysis or the like using, for example, the input data D701 as explanatory variables and the output data D702 as a response variable.

[0150] The deterioration information model D7 includes a deterioration correlation having a deterioration correlation between, for example, the input data D701 and the output data D702. The deterioration correlation may be generated by machine learning using, for example, a plurality of teacher data D70. The deterioration correlation indicates the degree of correlation between the input data D701 and the output data D702, and it can be determined that the higher the deterioration correlation is, the stronger the correlation between the data is. The deterioration correlation may be indicated by three or more values ​​(three or more stages) such as a percentage, or may be indicated by two or more values ​​(two or more stages).

[0151] Here, the deterioration correlation is constructed, for example, by the degree of connection between many-to-many information (plurality of input data D701, versus plural output data D702). The deterioration correlation is appropriately updated in the process of machine learning, and indicates, for example, a function (classifier) ​​optimized based on the plurality of input data D701 and the plurality of output data D702. Note that the deterioration correlation may have, for example, a plurality of deterioration correlations indicating the degree of connection between each data. For example, when the database D6 is constructed by a neural network, the deterioration correlation can be made to correspond to a weight variable.

[0152] For this reason, in the degradation assessment and soundness diagnosis system 100, for example, the output data D702 suitable for the input data D701 is selected using the degradation correlation based on all the results of the determination by the classifier. This makes it possible to quantitatively select the output data D702 suitable for the input data D701 not only when the input data D701 is the same as or similar to the output data D702, but also when the input data D701 is dissimilar.

[0153] The deterioration correlation may indicate, for example, the degree of connection between a plurality of input data D701 and a plurality of output data D702. In this case, by using the deterioration correlation, it is possible to link and store the degree of relationship between a plurality of output data D702 (for example, output data D702A, output data D702B) and each of a plurality of input data D701 (for example, input data D701A, input data D701B). Therefore, for example, a plurality of input data D701 can be linked to one output data D702 via the deterioration correlation. This makes it possible to realize a multifaceted selection of output data D702 for the input data D701.

[0154] The deterioration correlation has, for example, a plurality of deterioration correlations linking each input data D701 with each output data D702. The deterioration correlation is indicated in three or more stages, such as a percentage, 10 stages, or 5 stages, and is indicated, for example, by the characteristics of the line (for example, thickness, etc.). For example, "input data D701A" included in the input data D701 indicates a deterioration correlation AA of "73%" with "output data D702A" included in the output data D702, and indicates a deterioration correlation AB of "12%" with "output data D702B" included in the output data D702. That is, the "deterioration correlation" indicates the degree of correlation between each data, and for example, the higher the deterioration correlation, the stronger the connection between each data.

[0155] Furthermore, the deterioration correlation may be provided by providing at least one hidden layer between the input data D701 and the output data D702. The deterioration correlation described above is set in either the input data D701 or the hidden layer data, or in both, and this becomes the weighting of each data, and the output is selected based on this. Then, when this deterioration correlation exceeds a certain threshold, the output may be selected.

[0156] The degradation information model D7 may include a trained model generated by learning, for example, machine learning, using a plurality of teacher data D70. The trained model may be a neural network model such as a convolutional neural network (CNN) or a support vector machine (SVM). For example, deep learning may be used as the learning. For example, a generative adversarial network (GAN) may be used to generate the input data D701 in a pseudo manner.

[0157] <Teacher data D70> The teacher data D70 is used for learning to generate the degradation information model D7, for example. The teacher data D70 is a data set including, for example, input data D701 and output data D702.

[0158] A combination of a set of input data D701 and output data D702 included in the teacher data D70 includes, for example, a combination in which the reference power generation information D61 included in the input data D701 is linked to the reference degradation information D62 included in the output data D702. An example of a combination in which the reference power generation information D61 and the reference degradation information D62 are linked is shown in FIG. 6(b).

[0159] <Input data D701> The input data D701 is used as a part of the teacher data D70 used for learning to generate the degradation information model D7. The input data D701 includes, for example, reference power generation information D61 acquired in advance.

[0160] <Output data D702> The output data D702 is used as a part of the teacher data D70 used for learning to generate the degradation information model D7. The output data D702 includes, for example, reference degradation information D62 acquired in advance.

[0161] Next, the operation of the degradation assessment and soundness diagnosis system 100 in this embodiment will be described in detail.

[0162] <Advance preparation> Before operating the degradation assessment and soundness diagnosis system 100, the user U confirms that the degradation information model D7 previously learned by the learning unit 25, for example, is stored in the database D6 saved in the server 2.

[0163] <Deterioration information generating step S12> 8(b), for example, the degradation information generator 23 inputs the power generation information D1 of the energy harvesting device 1 to a degradation information model D7 that has been trained in advance using the reference power generation information D61 and the reference degradation information D62 as teacher data D70. After that, the degradation information model D7 generates degradation information D2 of the bridge structure St as an output result when the power generation information D1 is input.

[0164] After performing the above-mentioned steps, the operation of the degradation assessment and soundness diagnosis system 100 in this embodiment ends.

[0165] According to this embodiment, the system includes an energy harvesting device 1 installed on a bridge structure St, and a degradation information generating unit 23 that generates degradation information D2 corresponding to the power generation information D1 of the energy harvesting device 1 by referring to a database D6 in which reference power generation information D61 and reference degradation information D62 are linked and stored in advance. Therefore, while using the power generated based on the deformation of the bridge structure St as power, it is possible to accurately identify the degree of deformation of the bridge structure St from the power generation situation. This makes it possible to improve the accuracy of the degradation evaluation of the bridge structure St while achieving independence and long-term stabilization.

[0166] According to this embodiment, the deterioration information generator 23 receives the power generation information D1 as an input, and generates the deterioration information D2 using a deterioration information model D7 that has been trained in advance using the reference power generation information D61 and the reference deterioration information D62 as teacher data D70. This allows for a more diverse evaluation of the degree of deterioration corresponding to the degree of deformation of the bridge structure St. This improves the convenience of the deterioration evaluation of the bridge structure St.

[0167] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0168] 100 Deterioration assessment and health diagnosis system 1. Energy Harvesting Device 101 Support 102 Elastic body 110 Hollow body 11 Communications Department 12 Storage section 13 Power Generation Department 14 Acquisition Department 2 Server 20. Cabinet 201 CPU 202 ROM 203 RAM 204 Preservation Department 205~207 Interface 208 Input section 209 Display section 210 Internal Bus 21 Server Communication Department 22 Server memory unit 23 Deterioration information generation section 24 Degradation information output unit 25 Learning Department 3 Fixed part 31 Coil 32 Base 33 Hard magnetic material 4 Moving parts 41 Magnetic material 42 Base 44 Coil 5. Power storage unit 9. Communication Network St bridge structure C Vehicle U User R1 First magnetic field R2 Second magnetic field S11 Power generation step S12 Deterioration information generation step D1 Power Generation Information D2 Deterioration information D6 Database D61 Reference Power Generation Information D62 Deterioration Information for Reference D7 Degradation Information Model D70 training data D701 Input data D702 Output Data T61 Power Generation Information Table T62 Deterioration Information Table

Claims

1. A support installed on a bridge structure; An elastic body supported by the support body; a magnetic body having a first magnetic field, the magnetic body being sandwiched between the elastic body so as to be movable in a substantially vertical direction; a coil fixedly supported by the support within the first magnetic field; Equipped with The coil generates electricity by generating a current in response to the inertial motion of the magnetic body based on the deformation or displacement of the bridge structure. An energy harvesting device characterized by:

2. Further comprising a hard magnetic body fixed to and supported by the support body, The magnetic body is a soft magnetic body that is movably sandwiched within a second magnetic field of the hard magnetic body. The energy harvesting device according to claim 1 .

3. The magnetic body is a hard magnetic body. The energy harvesting device according to claim 1 .

4. The vibration generator may further include a vibration exciter that is provided on the surface or inside of the movable part and generates pseudo noise based on a pseudo noise signal received from the outside to move the movable part. The energy harvesting device according to claim 1 .

5. A support installed on a bridge structure; a magnetic body having a first magnetic field fixedly supported by the support; An elastic body supported by the support body; a coil held by the elastic body so as to be movable in a substantially vertical direction within the first magnetic field; Equipped with The coil generates electricity by generating a current in response to its own inertial motion based on the deformation or displacement of the bridge structure. An energy harvesting device characterized by:

6. A deterioration evaluation and soundness diagnosis system for evaluating deterioration of a bridge structure, comprising: An energy harvesting device according to any one of claims 1 to 5, which is installed on the bridge structure; a deterioration information generating unit that generates deterioration information corresponding to the power generation information by referring to a database in which reference power generation information corresponding to the power generation information indicating the state of power generation by the energy harvesting device and reference deterioration information corresponding to deterioration information indicating the attribute of deterioration of the bridge structure are linked and stored in advance; To be prepared A deterioration evaluation and health diagnosis system comprising:

7. the deterioration information generating unit receives the power generation information as an input, and generates the deterioration information by using a deterioration information model that has been trained in advance using the reference power generation information and the reference deterioration information as teacher data.

7. The degradation evaluation and health diagnosis system according to claim 6, further comprising:

Images