Measurement method, measurement device, measurement system, and measurement program

Abstract

To provide a measurement method that can accurately calculate an interval in which each of a plurality of railway vehicles has passed through a bridge.SOLUTION: A measurement method comprises: a response interval calculation step of calculating, on the basis of acceleration data, a plurality of response intervals each including a response to an action of each of a plurality of railway vehicles traveling on a bridge to an observation point of the bridge; and a passing interval calculation step of calculating, on the basis of the plurality of response intervals, a plurality of passing intervals in which each of the plurality of railway vehicles has passed through the bridge. In the passing interval calculation step, for a first response interval and a second response interval adjacent to each other among the plurality of response intervals, when a time interval between an end time of the first response interval and a start time of the second response interval is equal to or less than a threshold value, the one passing interval including the first response interval and the second response interval is calculated, and when the time interval is larger than the threshold value, the two passing intervals each including the first response interval and the second response interval are calculated.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a measurement method, a measurement device, a measurement system, and a measurement program. [Background technology]

[0002] Patent Document 1 describes an acceleration sensor attached to a railway bridge, and a deflection measuring device that sets the output of the acceleration sensor when the railway bridge is in an unloaded state as the zero point of acceleration, corrects the zero point of acceleration output by the acceleration sensor when the railway bridge is in a loaded state, and after the zero point correction, suppresses drift and estimates the amount of deflection of the railway bridge by applying double integration, Bayesian estimation, Kalman filter, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-049095 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the deflection measuring device described in Patent Document 1, if, for example, the peak acceleration when a railway vehicle approaches or leaves a railway bridge is high and the acceleration while the railway vehicle is traveling is small during that time, there is a risk that the device may mistakenly determine that two railway vehicles have passed over the railway bridge. [Means for solving the problem]

[0005] One aspect of the measurement method according to the present invention is to a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; Including, In the passing section calculation step, For adjacent first and second response intervals among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one pass interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively, are calculated.

[0006] One aspect of the measuring device according to the present invention is a response interval calculation unit that calculates a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation unit that calculates a plurality of passing sections along which each of the plurality of railway vehicles has passed over the bridge based on the plurality of response sections; Including, The passing section calculation unit For a first response interval and a second response interval that are adjacent to each other among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one passing interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, one passing interval including the first response interval and the second response interval is calculated. and calculate two passing sections each including the above.

[0007] One aspect of the measurement system according to the present invention is One aspect of the measurement device; the acceleration sensor; Equipped with.

[0008] One aspect of the measurement program according to the present invention is a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; on the computer, In the passing section calculation step, For adjacent first and second response intervals among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one pass interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively, are calculated. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a measurement system. [Figure 2] A cross-sectional view of the superstructure in Figure 1 taken along line AA. [Figure 3] FIG. 3 is an explanatory diagram of acceleration detected by an acceleration sensor. [Figure 4] FIG. 10 is a diagram showing an example of acceleration α(k) when two railroad vehicles travel on a bridge. [Figure 5] FIG. 10 is a diagram showing acceleration αFLT(k) obtained by band-pass filtering acceleration α(k). [Figure 6] FIG. 10 is a diagram showing acceleration αabs(k), which is the absolute value of acceleration αFLT(k). [Figure 7] FIG. 10 is a diagram showing acceleration αS(k) obtained by low-pass filtering acceleration αabs(k). [Figure 8] FIG. 10 is a diagram showing acceleration αS(k) and threshold value cas_th. [Figure 9] FIG. 10 is a diagram showing a response interval BS(k) obtained by comparing acceleration αS(k) with a threshold value cas_th. [Figure 10] FIG. 10 is a diagram showing a pass interval BSasm(k) obtained from the response interval BS(k) of FIG. [Figure 11] FIG. 1 is a diagram showing an example of the vehicle length LC (Cm) and the distance between the axles La (aw(Cm,n)). [Figure 12] FIG. 4 is a flowchart showing an example of the procedure of the measurement method of the present embodiment. [Figure 13] FIG. 4 is a flowchart showing an example of a procedure of a passing section calculation step in the first embodiment. [Figure 14] FIG. 1 is a diagram showing an example of the configuration of a sensor, a measuring device, and a monitoring device. [Figure 15] 10 is a diagram showing a difference value BSd(k) obtained from the response interval BS(k) shown in FIG. [Figure 16] 16 is a diagram showing a pass section BSasm(k) obtained from the difference value BSd(k) of FIG. 15; [Figure 17] FIG. 10 is a flowchart showing an example of a procedure of a passing section calculation step in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0011] 1. First embodiment 1-1. Measurement system configuration Railway vehicles passing over bridges are heavy and can be measured using BWIM. BWIM stands for Bridge Weigh in Motion, and is a technology that measures the weight and number of axles of railway vehicles passing over a bridge by treating the bridge as a "scale" and measuring the deformation of the bridge. Bridges that can analyze the weight of passing railway vehicles from responses such as deformation and strain are structures where BWIM can function, and the BWIM system, which applies the physical process between the action and response on the bridge, makes it possible to measure the weight of passing railway vehicles.

[0012] Fig. 1 is a diagram showing an example of a measurement system according to this embodiment. As shown in Fig. 1, the measurement system 10 according to this embodiment includes a measurement device 1 and at least one sensor 2 provided on a bridge 5. The measurement system 10 may also include a monitoring device 3.

[0013] The bridge 5 comprises a superstructure 7 and a substructure 8. Figure 2 is a cross-sectional view of the superstructure 7 taken along line AA in Figure 1. As shown in Figures 1 and 2, the superstructure 7 includes a bridge deck 7a consisting of deck plates F, main girders G, and crossbeams (not shown), as well as bearings 7b, rails 7c, sleepers 7d, and ballast 7e. As shown in Figure 1, the substructure 8 includes piers 8a and abutments 8b. The superstructure 7 is a structure spanning either adjacent abutments 8b and piers 8a, two adjacent abutments 8b, or two adjacent piers 8a. Both ends of the superstructure 7 are located at the positions of adjacent abutments 8b and piers 8a, two adjacent abutments 8b, or two adjacent piers 8a.

[0014] When a railway vehicle 6 enters the superstructure 7 of the bridge 5, the weight of the railway vehicle 6 causes the superstructure 7 to bend, but since the railway vehicle 6 is made up of multiple cars connected together, the bending of the superstructure 7 is repeated periodically as each car passes.

[0015] The measuring device 1 and each sensor 2 are connected by, for example, a cable (not shown) and communicate with each other via a communication network such as a CAN. CAN is an abbreviation for Controller Area Network. Alternatively, the measurement device 1 and each sensor 2 may communicate via a wireless network.

[0016] In this embodiment, each sensor 2 is an acceleration sensor that outputs acceleration data when the railway vehicle 6 travels over the bridge 5. Each sensor 2 may be, for example, a quartz acceleration sensor or a MEMS acceleration sensor. MEMS is an abbreviation for Micro Electro Mechanical Systems.

[0017] In this embodiment, each sensor 2 is installed in the longitudinal center of the superstructure 7 of the bridge 5, specifically, in the longitudinal center of the main girder G. However, each sensor 2 only needs to be able to detect acceleration generated by the running of the railway vehicle 6, and its installation position is not limited to the center of the superstructure 7. If each sensor 2 were installed on the deck F of the superstructure 7, there would be a risk of it being destroyed by the running of the railway vehicle 6, and there would also be a risk that measurement accuracy would be affected by local deformation of the bridge deck 7a. Therefore, in the example of Figures 1 and 2, each sensor 2 is installed on the main girder G of the superstructure 7.

[0018] The deck F and main girder G of the superstructure 7 are subjected to the load of the railway vehicle 6 passing through the bridge 5. The sensors 2 detect the acceleration of the deflection of the deck F and main girders G due to the load of a railway vehicle 6 passing over the bridge 5.

[0019] The measurement device 1 calculates the displacement of the bridge 5 when the railway vehicle 6 passes over the bridge 5, based on the acceleration data output from each sensor 2. The measurement device 1 is installed, for example, on an abutment 8b.

[0020] The measuring device 1 and the monitoring device 3 can communicate with each other via a communication network 4, such as a wireless mobile phone network or the Internet. The measuring device 1 transmits measurement data, including the displacement of the bridge 5, when a railroad vehicle 6 passes over the bridge 5 to the monitoring device 3. The monitoring device 3 stores the measurement data in a storage device (not shown) and may display whether the sensor 2 is in a normal state or an abnormal state based on, for example, the determination result of the state of the sensor 2 contained in the measurement data. The measuring device 1 may also perform processing such as monitoring the railroad vehicle 6 and determining whether an abnormality exists in the superstructure 7 based on, for example, the displacement of the bridge 5 contained in the measurement data.

[0021] In this embodiment, the bridge 5 is a railway bridge, such as a steel bridge, a girder bridge, or an RC bridge, etc. RC is an abbreviation for Reinforced Concrete.

[0022] As shown in FIG. 2 , in this embodiment, an observation point R is set in association with the sensor 2. In the example of FIG. 2 , the observation point R is set at a position on the surface of the superstructure 7 vertically above the sensor 2, which is installed on the main girder G. That is, the sensor 2 is an acceleration sensor that observes the observation point R, detects accelerations that are responses to the actions of multiple parts of the railway vehicle 6 traveling on the bridge 5 on the observation point R, and outputs acceleration data including the detected accelerations. For example, each of the multiple parts of the railway vehicle 6 is an axle or a wheel, but hereinafter, it will be assumed that the sensor 2 is an axle. The sensor 2 may be installed in a position where it can detect the acceleration occurring at the observation point R due to the traveling of the railway vehicle 6, but it is preferable that the sensor 2 be installed in a position close to the vertical line of the observation point R.

[0023] The number and installation positions of the sensors 2 are not limited to the examples shown in FIGS. 1 and 2, and various modifications are possible.

[0024] Based on the acceleration data output from the sensor 2, the measurement device 1 acquires acceleration in a direction intersecting the plane of the superstructure 7 of the bridge 5 on which the railcar 6 travels. The plane of the superstructure 7 on which the railcar 6 travels is defined by the X direction, which is the direction in which the railcar 6 travels, i.e., the longitudinal direction of the superstructure 7, and the Y direction, which is the width direction of the superstructure 7, which is a direction perpendicular to the direction in which the railcar 6 travels. As the railcar 6 travels, the observation point R deflects in directions perpendicular to the X and Y directions. Therefore, in order to accurately calculate the magnitude of the acceleration of the deflection, it is desirable for the measurement device 1 to acquire acceleration in the direction perpendicular to the X and Y directions, i.e., the Z direction which is the normal direction of the deck F.

[0025] 3 is a diagram illustrating acceleration detected by the sensor 2. The sensor 2 is an acceleration sensor that detects acceleration occurring in each of three mutually orthogonal axial directions.

[0026] In order to detect the acceleration of the deflection at observation point R due to the movement of the railway vehicle 6, the sensor 2 is installed so that one of the three detection axes, the x-axis, y-axis, and z-axis, intersects with the X-direction and the Y-direction. Because observation point R deflects in a direction perpendicular to the X-direction and the Y-direction, in order to accurately detect the acceleration of the deflection, ideally the sensor 2 is installed so that one axis is aligned with the Z-direction perpendicular to the X-direction and the Y-direction, i.e., the normal direction of the floor panel F.

[0027] However, when sensor 2 is installed on the superstructure 7, the installation location may be tilted. Even if one of the three detection axes of sensor 2 is not installed in the normal direction of floor board F, the error is small and negligible as long as it is roughly oriented in the normal direction. Furthermore, even if one of the three detection axes of sensor 2 is not installed in the normal direction of floor board F, measurement device 1 can correct the detection error due to the tilt of sensor 2 by using a three-axis resultant acceleration that is a combination of accelerations on the x-, y-, and z-axes. Furthermore, sensor 2 may be a one-axis acceleration sensor that detects at least acceleration occurring in a direction approximately parallel to the vertical direction or acceleration in the normal direction of floor board F.

[0028] The measurement method of this embodiment executed by the measurement device 1 will be described in detail below.

[0029] 1-2. Details of measurement method In this embodiment, the measurement device 1 calculates multiple response intervals including the response of each of the multiple railway vehicles 6 to an action on the observation point R, based on the acceleration data output from the sensor 2. Then, the measurement device 1 calculates multiple passing intervals in which each of the multiple railway vehicles 6 passed over the bridge 5, based on the calculated multiple response intervals.

[0030] When each of the multiple railway vehicles 6 travels across the bridge 5, an acceleration occurs at the observation point R in the direction of the gravitational acceleration. The sensor 2 detects this acceleration as acceleration α(k) in the z-axis direction and outputs acceleration data containing the acceleration α(k) in a time series, where k is the data number. Figure 4 shows an example of the acceleration α(k) when two railway vehicles 6A and 6B travel across the bridge 5. In the example of Figure 4, an acceleration occurs due to the travel of railway vehicle 6A, and then an acceleration occurs due to the travel of railway vehicle 6B.

[0031] The measuring device 1 acquires acceleration data from the sensor 2, and filters the acceleration α(k) to reduce unnecessary low-frequency signal components, as shown in equation (1), to obtain the acceleration α FLT (k) is calculated. This removes the offset and calculates the acceleration α FLT (k) is obtained. In equation (1), the filtering process f FLT (d) may be high-pass filtering or band-pass filtering.

[0032]

number

[0033] For example, the measurement device 1 calculates the acceleration α by N-1 order FIR filter processing as shown in equation (2). FLT In equation (2), for example, N is an even number equal to or greater than 2, and h(0) to h(N-1) are impulse response coefficients. FIG. 5 shows the acceleration α(k) obtained by band-pass filtering the acceleration α(k) shown in FIG. FLT (k) is shown.

[0034]

number

[0035] Next, the measurement device 1 calculates the acceleration α FLT The absolute value of (k) is the acceleration α abs (k) is calculated.FLT The absolute value of (k) is the acceleration α abs (k) is shown.

[0036]

number

[0037] Next, the measurement device 1 calculates the acceleration α as shown in Equation (4). abs Acceleration α obtained by applying low-pass filtering to (k) to reduce high-frequency noise S Calculate (k).

[0038]

number

[0039] For example, the measurement device 1 calculates k h Acceleration α of each abs Acceleration α by moving average of (k) S (k) may be calculated. For example, k h is an odd number equal to or greater than 3. abs (k) is processed by a low-pass filter to obtain the acceleration α S (k) is shown by a solid line. In FIG. 7, the acceleration α abs (k) is also shown with a dashed line.

[0040]

number

[0041] Next, the measurement device 1 calculates the acceleration α S (k) is the threshold c as_th By comparing and binarizing, the response interval B S Calculate (k). Response section B S The section where (k)=1 is the response section that includes the response to the action of the railway vehicle 6 on the observation point R. as_th is the acceleration α SThe amplitude is adjusted to a value that is greater than the noise amplitude of (k) and smaller than the amplitude of the response of the railway vehicle 6.

[0042]

number

[0043] Figure 8 shows the acceleration α S (k) is shown by a solid line, and the threshold c as_th is shown by a dashed line. Also, in FIG. 9, the acceleration α S (k) and threshold c as_th Response interval B obtained by comparing S (k) is shown by a solid line. In FIG. 9, the acceleration α FLT (k) is also shown by a dashed line. In the example of Figure 9, the response section of railway vehicle 6A is one, while the response section of railway vehicle 6B is separated into two. This is thought to be because, due to the relationship between the distance between the axles of railway vehicle 6B and the length of bridge 5, when the responses from each axle are added together, the vibrations in the middle part are canceled out. Therefore, in the example of Figure 9, response section B is as if three railway vehicles 6 were running. S (k) is obtained.

[0044] Therefore, in order to prevent the erroneous determination that two railway vehicles 6 have passed through the bridge 5 when the response section of one railway vehicle 6 is separated into two, the measurement device 1 calculates one passing section including the first response section and the second response section when the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold value for a first response section and a second response section that are adjacent among the multiple response sections. Also, when the time interval between the end time of the first response section and the start time of the second response section is greater than a threshold value, the measurement device 1 calculates one passing section including the first response section and the second response section. Calculate two passing sections that include the answer section and the answer section.

[0045] In this embodiment, the measurement device 1 detects the response interval B S The (k)=1 section is surrounded by a margin section C Sam Passing section B is extended by half SasmCalculate (k). Passing section B Sasm The section where (k)=1 is the section where the railway vehicle 6 passed over the bridge 5. In this case, the margin section C Sam When the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than the threshold, a single pass interval including the first response interval and the second response interval is obtained. This single pass interval starts before the start time of the first response interval and ends after the end time of the second response interval. In addition, the margin interval C Sam When the time interval between the end time of the first response interval and the start time of the second response interval is greater than the threshold, two passing intervals including the first response interval and the second response interval are calculated. The first passing interval starts before the start time of the first response interval and ends after the end time of the first response interval. The second passing interval starts before the start time of the second response interval and ends after the end time of the second response interval. For example, according to equation (7), passing interval B Sasm (k) is obtained.

[0046]

number

[0047] Figure 10 shows the response interval B in Figure 9. S Passing section B obtained from (k) Sasm (k) is shown by a solid line. In FIG. 10, the acceleration α FLT (k) and response section B shown in Fig. 9 S (k) is also shown by a dashed line. In the example of Fig. 10, one passing section is obtained for the railcar 6A, and another passing section is obtained for the railcar 6B.

[0048] The time required for each of the multiple railway vehicles 6 to pass through the bridge 5 is defined as the passing time t s is margin section C Sam If the time width is smaller than the time width of the margin section C, two or more passing sections will not be obtained for each of the multiple railway vehicles 6. SamThe threshold value, which is the time width of the passing time t s On the other hand, the margin section C Sam If the time width of t is too large, when two railroad vehicles 6A and 6B pass over the bridge 5 in turn, the two original passing sections may be combined into one passing section. From the viewpoint of ensuring the safety of travel, the time from when the first railroad vehicle 6A leaves the bridge 5 until the second railroad vehicle 6B enters the bridge 5 should be set to t s Therefore, the margin C Sam The threshold value, which is the time width of the passing time t s Therefore, the margin section C Sam may be in the range shown in formula (8). In formula (8), d smp is the sampling rate of the acceleration data.

[0049]

number

[0050] transit time t s is the bridge length L B and the dimensions of the railway vehicle 6 passing over the bridge 5. B is the length of the bridge 5, and in this embodiment, For example, if the bridge 5 has multiple superstructures 7, the bridge length L B is the distance between the ingress end and egress end of each superstructure 7. The dimensions of the railcar 6 are, for example, the length L of each railcar 6. C (C m ), the number of axles in each vehicle a T (C m ) and the distance between the axles of each vehicle La(a w (C m ,n)) is included. C m is the vehicle number, and the length of each vehicle L C (C m ) starts with C m The distance between the two ends of the th vehicle is the number of axles in each vehicle. T (Cm ) starts with C m n is the axle number of each vehicle, and 1≦n≦a T (C m ) The distance between the axles of each vehicle is La(a w (C m ,n)) is C from the beginning when n=1. m When n≧2, it is the distance between the n-1th axle from the front and the nth axle. m Length of the th vehicle L C (C m ) and the distance between the axles La(a w (C m ,n)) is shown below. The dimensions of the railway vehicle 6 can be measured by a known method. A database of the dimensions of railway vehicles 6 passing over the bridge 5 may be created in advance, and the dimensions of the relevant vehicle may be referenced based on the time of passing.

[0051] In addition, when it is assumed that a railway vehicle 6 consisting of any number of vehicles with the same dimensions runs on the bridge 5, the dimensions of the railway vehicle 6 are calculated by multiplying the length L of one vehicle by the length L of the other vehicle. C (C m ), number of axles a T (C m ) and the distance between the axles La(a w (C m ,n)).

[0052] From the front axle of railcar 6 to C m Distance D to the nth axle of the nth vehicle wa (a w (C m ,n)) is the length of each vehicle L C (C m ), the number of axles in each vehicle a T (C m ) and the distance between the axles of each vehicle La(a w (C m ,n)) is calculated by equation (9). In equation (9), L C (C m )=L C(1) is assumed to be true.

[0053]

number

[0054] The number of railcars is C T As a result, in equation (9), C m =C T , n=a T (C T ) From equation (10), the distance D from the front axle of the railway vehicle 6 to the rear axle of the rearmost vehicle is wa (a w (C T ,a T (C T ))) is calculated.

[0055]

number

[0056] transit time t s is the bridge length L B , the length of the train L, which is the length of the railcar 6 T , and the average running speed v0 expected when the railway vehicle 6 passes over the bridge 5, is calculated in advance by equation (11). T is the distance D calculated by equation (10) wa (a w (C T ,a T (C T ))).

[0057]

number

[0058] The dimensions and number of railroad vehicles 6 passing through the bridge 5 T If different, the transit time t sThen, the measurement device 1 identifies the railway vehicle 6 that has passed over the bridge 5, for example, based on a timetable, and calculates the passing time t s Using this, the margin range C of the above formula (8) Sam and then, using the above equation (7), the passing section B Sasm (k) can be calculated.

[0059] The measurement device 1 calculates the passing section B using equation (12). Sasm Acceleration α when (k)=1 FLT (k) is the acceleration α Sm Extract as (k).

[0060]

number

[0061] Then, the measurement device 1 passes through section B. Sasm Acceleration α when (k)=1 Sm (k) when each of the plurality of railroad vehicles 6 passes over the bridge 5. FLT (k) is saved securely. Sasm Acceleration α when (k)=1 Sm Based on (k), the displacement of bridge 5 is calculated.

[0062] 1-3. Measurement procedure 12 is a flow chart showing an example of the procedure of the measurement method according to the first embodiment. In this embodiment, the measurement device 1 executes the procedure shown in FIG.

[0063] 12, first, in the acceleration data acquisition step S10, the measurement device 1 acquires acceleration data output from an acceleration sensor, sensor 2. Sensor 2 observes an observation point R on a bridge 5 and detects accelerations that are responses to the actions of multiple parts of a railway vehicle 6 traveling on the bridge 5 on observation point R.

[0064] Next, in a response interval calculation step S20, the measurement device 1 calculates a plurality of response intervals including responses to the actions of the plurality of railway vehicles 6 traveling on the bridge 5 on the observation point R, based on the acceleration data acquired in step S10. For example, the measurement device 1 calculates a response interval B S (k) is calculated and the response interval B S A plurality of intervals where (k)=1 may be set as a plurality of response intervals.

[0065] Next, in a passing section calculation step S30, the measurement device 1 calculates multiple passing sections through which each of the multiple railway vehicles 6 has passed over the bridge 5, based on the multiple response sections calculated in step S20. Specifically, for a first response section and a second response section that are adjacent to each other among the multiple response sections calculated in step S20, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold, the measurement device 1 calculates one passing section that includes the first response section and the second response section. In this embodiment, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than the threshold, the measurement device 1 calculates one passing section that starts before the start time of the first response section and ends after the end time of the second response section. Furthermore, if the time interval between the end time of the first response section and the start time of the second response section is greater than the threshold, the measurement device 1 calculates two passing sections that include the first response section and the second response section, respectively. The threshold value is the time required for each of the plurality of railway vehicles 6 to pass through the bridge 5, i.e., the passing time t s The threshold is greater than the passing time t s An example of the procedure of the passing section calculation step S30 will be described later.

[0066] Next, in a passing section acceleration calculation step S40, the measurement device 1 calculates the acceleration in each of the passing sections calculated in step S30 based on the acceleration data acquired in step S10. For example, the measurement device 1 calculates the acceleration α FLT (k) is calculated and the passing section B is calculated using the above formula (12). SasmAcceleration α when (k)=1 FLT (k) is the acceleration α Sm It may also be calculated as (k).

[0067] Next, in a displacement calculation step S50, the measurement device 1 calculates the displacement of the bridge 5 when each of the multiple railway vehicles 6 travels, based on the acceleration in each of the multiple passing sections calculated in step S40. For example, the measurement device 1 calculates the displacement of the bridge 5 when each of the multiple passing sections travels, based on the acceleration α Sm The displacement of the bridge 5 may be calculated by integrating (k) twice and performing a filter process to reduce the integration error, or the displacement of the bridge 5 may be calculated by other known methods.

[0068] Next, in a measurement data output step S60, the measurement device 1 outputs measurement data including the displacement calculated in step S50 to the monitoring device 3. Specifically, the measurement device 1 transmits the measurement data to the monitoring device 3 via the communication network 4. The measurement data is further Sasm (k), acceleration α Sm (k) etc. may also be included.

[0069] Then, the measuring device 1 repeats the processes of steps S10 to S60 until the measurement is completed in step S70.

[0070] FIG. 13 is a flowchart showing an example of the procedure of the passing section calculation step S30 in FIG.

[0071] As shown in FIG. 13, in step S301, the measurement device 1 calculates the response interval B calculated in step S20 of FIG. 12 as in the above-mentioned formula (7). S For (k), the margin section C Sam Calculate the moving average over a range of .

[0072] Then, in step S302, the measurement device 1 calculates the response interval B calculated in step S301 using the above-mentioned formula (7). S The section where the moving average of (k) is not 0 is set to 1. Sasm Calculate (k) and pass section BSasm A plurality of sections where (k)=1 are set as a plurality of passing sections.

[0073] 1-4. Configuration of sensors, measuring devices and monitoring devices 14 is a diagram showing an example configuration of the sensor 2, the measuring device 1, and the monitoring device 3. As shown in FIG. 14, the sensor 2 includes a communication unit 21, an acceleration sensor 22, a processor 23, and a storage unit 24.

[0074] The storage unit 24 is a memory that stores various programs, data, etc. for the processor 23 to perform calculation processing and control processing. The storage unit 24 also stores programs, data, etc. for the processor 23 to realize predetermined application functions.

[0075] The acceleration sensor 22 detects acceleration occurring in each of the three axial directions.

[0076] The processor 23 controls the acceleration sensor 22 by executing the observation program 241 stored in the memory unit 24, generates acceleration data 242 based on the acceleration detected by the acceleration sensor 22, and stores the generated acceleration data 242 in the memory unit 24.

[0077] The communication unit 21 transmits the acceleration data 242 stored in the storage unit 24 to the measurement device 1 under the control of the processor 23 .

[0078] As shown in FIG. 14, the measurement device 1 includes a first communication unit 11, a second communication unit 12, a storage unit 13, and a processor .

[0079] The first communication unit 11 receives acceleration data 242 from the sensor 2 and outputs the received acceleration data 242 to the processor 14.

[0080] The storage unit 13 is a memory that stores programs, data, etc. for the processor 14 to perform calculation processing and control processing. The storage unit 13 also stores various programs, data, etc. for the processor 14 to realize predetermined application functions. The processor 14 may also receive various programs, data, etc. via the communication network 4 and store them in the storage unit 13.

[0081] The processor 14 generates measurement data 133 based on the acceleration data 242 received by the first communication unit 11, and stores the generated measurement data 133 in the storage unit 13.

[0082] In this embodiment, the processor 14 executes a measurement program 131 stored in the storage unit 13, thereby functioning as an acceleration data acquisition unit 141, a response interval calculation unit 142, a passing interval calculation unit 143, a passing interval acceleration calculation unit 144, a displacement calculation unit 145, and a measurement data output unit 146. That is, the processor 14 includes the acceleration data acquisition unit 141, the response interval calculation unit 142, the passing interval calculation unit 143, the passing interval acceleration calculation unit 144, the displacement calculation unit 145, and the measurement data output unit 146.

[0083] The acceleration data acquisition unit 141 acquires the acceleration data 242 received by the first communication unit 11, and stores it in the storage unit 13 as acceleration data 132. That is, the acceleration data acquisition unit 141 performs the process of the acceleration data acquisition step S10 in FIG.

[0084] The response interval calculation unit 142 calculates a plurality of response intervals including responses of a plurality of railway vehicles 6 traveling on the bridge 5 to the action on each of the observation points R, based on the acceleration data acquired by the acceleration data acquisition unit 141. For example, the response interval calculation unit 142 calculates the response interval B S (k) is calculated and the response interval B S A plurality of response intervals may be set to a plurality of intervals where (k) = 1. That is, the response interval calculation unit 142 performs the process of the response interval calculation step S20 in FIG.

[0085] The passing section calculation unit 143 calculates a plurality of passing sections in which each of the plurality of railway vehicles 6 has passed over the bridge 5, based on the plurality of response sections calculated by the response section calculation unit 142. Specifically, for a first response section and a second response section that are adjacent to each other among the plurality of response sections calculated by the response section calculation unit 142, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold, the passing section calculation unit 143 calculates one passing section that includes the first response section and the second response section. In the present embodiment, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold, the passing section calculation unit 143 calculates one passing section that starts before the start time of the first response section and ends after the end time of the second response section. Furthermore, if the time interval between the end time of the first response interval and the start time of the second response interval is greater than a threshold, the pass interval calculation unit 143 calculates two pass intervals including the first response interval and the second response interval, respectively. S For (k), the margin section C Sam Calculate the moving average over the range of response interval B S The section where the moving average of (k) is not 0 is set to 1. Sasm Calculate (k) and pass section B Sasm The plurality of passing sections may be a plurality of sections where (k) = 1. That is, the passing section calculation unit 143 performs the processing of the passing section calculation step S30 in Fig. 12, specifically, the processing of steps S301 and S302 in Fig. 13.

[0086] The passing section acceleration calculation unit 144 calculates the acceleration in each of the plurality of passing sections calculated by the passing section calculation unit 143 based on the acceleration data acquired by the acceleration data acquisition unit 141. For example, the passing section acceleration calculation unit 144 calculates the acceleration α FLT (k) is calculated and the passing section B is calculated using the above formula (12). Sasm Acceleration α when (k)=1 FLT (k) is the acceleration α Sm12. That is, the passing section acceleration calculation unit 144 performs the process of the passing section acceleration calculation step S40 in FIG.

[0087] The displacement calculation unit 145 calculates the displacement of the bridge 5 when each of the multiple railway vehicles 6 travels, based on the acceleration in each of the multiple passing sections calculated by the passing section acceleration calculation unit 144. For example, the displacement calculation unit 145 calculates the displacement of the bridge 5 when each of the multiple passing sections travels, based on the acceleration in each of the multiple passing sections α Sm The displacement of the bridge 5 may be calculated by performing double integration on (k) and filtering to reduce the integration error, or by using other known methods. That is, the displacement calculation unit 145 performs the process of the displacement calculation step S50 in FIG. 12.

[0088] The displacement of the bridge 5 calculated by the displacement calculation unit 145 is stored in the storage unit 13 as at least a part of the measurement data 133. The measurement data 133 further includes the following data: Sasm (k), acceleration α Sm (k) etc. may also be included.

[0089] The measurement data output unit 146 reads out the measurement data 133 stored in the storage unit 13 and outputs the measurement data 133 to the monitoring device 3. Specifically, under the control of the measurement data output unit 146, the second communication unit 12 transmits the measurement data 133 stored in the storage unit 13 to the monitoring device 3 via the communication network 4. That is, the measurement data output unit 146 performs the processing of the measurement data output step S60 in FIG. 12 .

[0090] In this way, the measurement program 131 is a program that causes the measurement device 1, which is a computer, to execute each procedure of the flowchart shown in FIG.

[0091] As shown in FIG. 14, the monitoring device 3 includes a communication unit 31, a processor 32, a display unit 33, an operation unit 34, and a storage unit 35.

[0092] The communication unit 31 receives the measurement data 133 from the measurement device 1 and outputs the received measurement data 133 to the processor 32 .

[0093] The display unit 33 displays various types of information under the control of the processor 32. The display unit 33 may be, for example, a liquid crystal display or an organic EL display. EL is an abbreviation for Electro Luminescence.

[0094] The operation unit 34 outputs operation data corresponding to an operation by the user to the processor 32. The operation unit 34 may be, for example, an input device such as a mouse, a keyboard, or a microphone.

[0095] The storage unit 35 is a memory that stores various programs, data, etc. for the processor 32 to perform calculation processing and control processing. The storage unit 35 also stores programs, data, etc. for the processor 32 to realize predetermined application functions.

[0096] The processor 32 acquires the measurement data 133 received by the communication unit 31, evaluates the change in displacement of the bridge 5 over time based on the acquired measurement data 133, generates evaluation information, and displays the generated evaluation information on the display unit 33.

[0097] In this embodiment, the processor 32 functions as a measurement data acquisition unit 321 and a monitoring unit 322 by executing a monitoring program 351 stored in the storage unit 35. That is, the processor 32 includes the measurement data acquisition unit 321 and the monitoring unit 322.

[0098] The measurement data acquisition unit 321 acquires the measurement data 133 received by the communication unit 31, and adds the acquired measurement data 133 to the measurement data sequence 352 stored in the storage unit .

[0099] The monitoring unit 322 statistically evaluates the change in displacement of the bridge 5 over time based on the measurement data sequence 352 stored in the memory unit 35. Then, the monitoring unit 322 generates evaluation information indicating the evaluation results and displays the generated evaluation information on the display unit 33. The user can monitor the condition of the bridge 5 based on the evaluation information displayed on the display unit 33.

[0100] The monitoring unit 322 may perform processes such as monitoring the railway vehicle 6 and determining abnormalities in the bridge 5 based on the measurement data sequence 352 stored in the storage unit 35.

[0101] Furthermore, the processor 32 transmits information for adjusting the operating conditions of the measuring device 1 and the sensor 2 to the measuring device 1 via the communication unit 31 based on operation data output from the operation unit 34. The operating conditions of the measuring device 1 are adjusted based on the information received via the second communication unit 12. The measuring device 1 also transmits information for adjusting the operating conditions of the sensor 2 received via the second communication unit 12 to the sensor 2 via the first communication unit 11. The operating conditions of the sensor 2 are adjusted based on the information received via the communication unit 21.

[0102] The functions of the processors 14, 23, and 32 may be realized by individual hardware components, or may be realized by integrated hardware components. For example, the processors 14, 23, and 32 may include hardware components, and the hardware components may include at least one of a circuit for processing digital signals and a circuit for processing analog signals. The processors 14, 23, and 32 may be a CPU, a GPU, a DSP, or the like. CPU is an abbreviation for Central Processing Unit, and GPU is an abbreviation for Graphics Processing Unit. DSP is an abbreviation for Digital Signal Processor. The processors 14, 23, and 32 may be configured as custom ICs such as ASICs to realize the functions of each section, or the functions of each section may be realized by a CPU and an ASIC. ASIC is an abbreviation for Application Specific Integrated Circuit, and IC is an abbreviation for Integrated Circuit. be.

[0103] The storage units 13, 24, and 35 are configured by, for example, various types of IC memory such as ROM, flash ROM, and RAM, as well as recording media such as hard disks and memory cards. ROM is an abbreviation for Read Only Memory, RAM is an abbreviation for Random Access Memory, and IC is an abbreviation for Integrated Circuit. The storage units 13, 24, and 35 include non-volatile information storage devices that are computer-readable devices or media, and various programs, data, and the like may be stored in the information storage devices. The information storage devices may be optical disks such as DVDs and CDs, hard disk drives, or various types of memory such as card-type memories and ROMs.

[0104] 14 shows only one sensor 2, multiple sensors 2 may each generate acceleration data 242 and transmit it to the measuring device 1. In this case, the measuring device 1 receives the multiple acceleration data 242 transmitted from the multiple sensors 2, generates multiple measurement data 133, and transmits it to the monitoring device 3. The monitoring device 3 also receives the multiple measurement data 133 transmitted from the measuring device 1, and monitors the state of the bridge 5 based on the received multiple measurement data 133.

[0105] 1-5.Effects As described above, in the measurement method of the first embodiment, the measurement device 1 calculates multiple response intervals including responses to the action on the observation point R of each of multiple railway vehicles 6 traveling on the bridge 5, based on acceleration data output from the sensor 2 provided on the bridge 5. Then, the measurement device 1 defines a margin interval C as the time interval between adjacent first and second response intervals among the calculated multiple response intervals. Sam and calculates one passing section passed by one railway vehicle 6 or two passing sections passed by two railway vehicles 6. Therefore, according to the measurement method of the first embodiment, the measurement device 1 can accurately calculate the section where each of the multiple railway vehicles 6 passed over the bridge 5.

[0106] Furthermore, according to the measurement method of the first embodiment, the margin section C Sam The transit time of railcar 6 is t s By setting this to a value greater than , the risk of erroneously calculating two passing sections when one railway vehicle 6 passes over a bridge 5 is reduced.

[0107] Furthermore, according to the measurement method of the first embodiment, the margin section C Sam The transit time of railcar 6 is t s By setting the value smaller than twice the distance, the risk of erroneously calculating one passing section when two railway vehicles 6 pass over a bridge 5 is reduced.

[0108] 2. Second embodiment In the following, the second embodiment will be described mainly with respect to the differences from the first embodiment, with the same components as those in the first embodiment being given the same reference numerals and explanations that overlap with those in the first embodiment being omitted or simplified.

[0109] In the second embodiment, similarly to the first embodiment, the measurement device 1 calculates the response interval B S (k) is calculated and the response interval B SIn the second embodiment, similarly to the first embodiment, when the response section of one railway vehicle 6 is divided into two, the measurement device 1 calculates one passing section including the first response section and the second response section if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold value, so as to avoid erroneously determining that two railway vehicles 6 have passed over the bridge 5. Furthermore, when the time interval between the end time of the first response section and the start time of the second response section is greater than a threshold value, the measurement device 1 calculates two passing sections including the first response section and the second response section, respectively.

[0110] In the second embodiment, the measurement device 1 calculates the response interval B S (k) difference B Sd Calculate (k) and calculate the difference B Sd (k) = ±1, where k is the jth k. Sd (j), where j=0, 1, 2,.... Figure 15 shows the response interval B shown in Figure 9. S The difference value B obtained from (k) Sd (k) is shown by a solid line. In FIG. 15, the acceleration α FLT (k) is also shown by a dashed line, and response interval B S (k) is also shown by a dashed line. Sd (0)~K Sd (5) is also shown.

[0111]

number

[0112] Then, the measuring device 1 is B Sd (K Sd If (j))=1, then K Sd (j) to K Sd Passing section B between (j+1) Sasm The value of (k) is set to 1. Also, the measurement device 1 is Sd (K Sd (j))=-1 and K Sd (j) and KSd The difference between (j+1) is margin C Sam If it is greater than 1 / 2 of Sd (j) to K Sd Between (j+1) Passing section B Sasm The value of (k) is set to 0. Also, the measurement device 1 is Sd (K Sd (j))=-1 and K Sd (j) and K Sd The difference between (j+1) is margin C Sam If it is less than half of K Sd (j) to K Sd Passing section B between (j+1) Sasm The value of (k) is set to 1.

[0113] Passing section B Sasm The section where (k)=1 is the section where the railway vehicle 6 passed over the bridge 5. In this case, the margin section C Sam When the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than the threshold, a single transit interval including the first response interval and the second response interval is obtained. This transit interval starts at the start time of the first response interval and ends at the end time of the second response interval. In addition, the margin interval C Sam If the time interval between the end time of the first response interval and the start time of the second response interval is greater than the threshold, two pass intervals each including the first response interval and the second response interval are calculated. The first pass interval starts at the start time of the first response interval and ends at the end time of the first response interval. The second pass interval starts at the start time of the second response interval and ends at the end time of the second response interval.

[0114] Figure 16 shows the difference B in Figure 15. Sd Passing section B obtained from (k) Sasm (k) is shown by a solid line. In FIG. 16, the acceleration α FLT (k) is also indicated by a dashed line. In the example of Fig. 16, one passing section is obtained for the railcar 6A, and another passing section is obtained for the railcar 6B.

[0115] Then, the measurement device 1 calculates the passing section B using the above-mentioned equation (12). Sasm Acceleration α when (k)=1 FLT (k) is the acceleration α Sm (k) and pass section B Sasm Acceleration α when (k)=1 Sm (k) when each of the plurality of railroad vehicles 6 passes over the bridge 5. FLT (k) is definitely preserved.

[0116] A flowchart showing an example of the procedure of the measurement method of the second embodiment is omitted because it is the same as Fig. 12. The processes of the acceleration data acquisition step S10, response interval calculation step S20, passing interval acceleration calculation step S40, displacement calculation step S50, and measurement data output step S60 in the measurement method of the second embodiment are the same as those in the first embodiment, so their explanations are omitted.

[0117] In the measurement method of the second embodiment, as in the first embodiment, in the passing section calculation step S30, the measurement device 1 calculates the multiple passing sections through which each of the multiple railway vehicles 6 has passed over the bridge 5 based on the multiple response sections calculated in step S20, but the procedure differs from that of the first embodiment.

[0118] FIG. 17 is a flowchart showing an example of the procedure of the passing section calculation step S30 of FIG. 12 in the second embodiment.

[0119] As shown in FIG. 17, in step S311, the measurement device 1 calculates the response interval B calculated in step S20 of FIG. 12 as in the above-mentioned formula (13). S (k) difference B Sd Calculate (k) and calculate the difference B Sd (k) = ±1, where k is the jth k. Sd (j).

[0120] Then, in step S312, the measurement device 1 calculates the difference value B Sd (K Sd(j)) = 1 Sd (j) to K Sd Between (j+1) and the difference value B Sd (K Sd (j))=-1 and K Sd (j) and K Sd The difference between (j+1) is margin C Sam K is less than half of Sd (j) to K Sd Passing section B, where the interval up to (j+1) is 1 Sasm Calculate (k) and pass section B Sasm A plurality of sections where (k)=1 are set as a plurality of passing sections.

[0121] The configurations of the sensor 2, the measuring device 1, and the monitoring device 3 in the second embodiment are the same as those in FIG. 14, and therefore are not shown in the figures.

[0122] In the measurement device 1 of the second embodiment, similarly to the first embodiment, the passing section calculation unit 143 calculates multiple passing sections in which each of the multiple railway vehicles 6 has passed over the bridge 5, based on the multiple response sections calculated by the response section calculation unit 142. Specifically, for a first response section and a second response section that are adjacent to each other among the multiple response sections calculated by the response section calculation unit 142, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold, the passing section calculation unit 143 calculates one passing section that includes the first response section and the second response section. In the present embodiment, if the time interval between the end time of the first response section and the start time of the second response section is equal to or less than a threshold, the passing section calculation unit 143 calculates one passing section that starts before the start time of the first response section and ends after the end time of the second response section. Furthermore, if the time interval between the end time of the first response interval and the start time of the second response interval is greater than a threshold, the pass interval calculation unit 143 calculates two pass intervals including the first response interval and the second response interval, respectively. For example, the pass interval calculation unit 143 calculates the response interval B calculated by the response interval calculation unit 142 as in the above-mentioned formula (13). S (k) difference B Sd Calculate (k) and calculate the difference B Sd (k) = ±1, where k is the jth k. SdThen, the passing section calculation unit 143 calculates the difference value B Sd (K Sd (j)) = 1 Sd (j) to K Sd Between (j+1) and the difference value B Sd (K Sd (j))=-1 and K Sd (j) and K Sd The difference between (j+1) is margin C Sam K is less than half of Sd (j) to K Sd Passing section B, where the interval up to (j+1) is 1 Sasm Calculate (k) and pass section B Sasm The plurality of passing sections may be a plurality of sections where (k) = 1. That is, the passing section calculation unit 143 performs the processing of the passing section calculation step S30 in Fig. 12, specifically, the processing of steps S311 and S312 in Fig. 17.

[0123] Other functions of the measuring device 1 in the second embodiment are the same as those in the first embodiment, and therefore their description will be omitted. Also, functions of the sensor 2 and the monitoring device 3 in the second embodiment are the same as those in the first embodiment, and therefore their description will be omitted.

[0124] According to the measurement method of the second embodiment, it is possible to achieve the same effects as the measurement method of the first embodiment.

[0125] 3. Variations The present invention is not limited to the present embodiment, and various modifications are possible within the scope of the present invention.

[0126] For example, in each of the above embodiments, each sensor 2 is provided on the main girder G of the superstructure 7, but it may also be provided on the surface or interior of the superstructure 7, the underside of the deck F, the pier 8a, etc.

[0127] The above-described embodiment and modifications are merely examples, and the present invention is not limited to these. For example, the embodiments and modifications can be combined as appropriate.

[0128] The present invention includes configurations that are substantially the same as the configurations described in the embodiments, for example, configurations with the same functions, methods, and results, or configurations with the same purpose and effects. The present invention also includes configurations that replace non-essential parts of the configurations described in the embodiments. The present invention also includes configurations that achieve the same effects or purposes as the configurations described in the embodiments. The present invention also includes configurations that add publicly known technology to the configurations described in the embodiments.

[0129] The following can be derived from the above-described embodiment and modifications.

[0130] One aspect of the measurement method is a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; Including, In the passing section calculation step, For adjacent first and second response intervals among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one pass interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively, are calculated.

[0131] In this measurement method, the time interval between adjacent first and second response sections among the calculated multiple response sections is compared with a threshold value to calculate one pass section passed by one railway vehicle or two pass sections passed by two railway vehicles. Therefore, this measurement method makes it possible to accurately calculate the section where each of the multiple railway vehicles passed over the bridge.

[0132] In one aspect of the measurement method, The threshold value may be greater than the time required for each of the plurality of railcars to pass over the bridge.

[0133] This measurement method reduces the risk of mistakenly calculating two passing sections when one railway vehicle passes over a bridge.

[0134] In one aspect of the measurement method, The threshold value may be less than twice the time required for each of the plurality of rail vehicles to pass over the bridge.

[0135] This measurement method reduces the risk of erroneously calculating a single passing section when two railway vehicles pass over a bridge.

[0136] In one aspect of the measurement method, In the passing section calculation step, If the time interval is equal to or less than the threshold, the one passing interval that starts before the start time of the first response interval and ends after the end time of the second response interval may be calculated.

[0137] In one aspect of the measurement method, In the passing section calculation step, If the time interval is equal to or less than the threshold, the one passing interval that starts at the start time of the first response interval and ends at the end time of the second response interval may be calculated.

[0138] One aspect of the measurement method is The method may include a passing section acceleration calculation step of calculating acceleration in each of the plurality of passing sections based on the acceleration data.

[0139] According to this measurement method, it is possible to accurately calculate the acceleration, which is the response when each of a plurality of railway vehicles passes over a bridge.

[0140] One aspect of the measurement device is a response interval calculation unit that calculates a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation unit that calculates a plurality of passing sections along which each of the plurality of railway vehicles has passed over the bridge based on the plurality of response sections; Including, The passing section calculation unit For adjacent first and second response intervals among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one pass interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively, are calculated.

[0141] This measurement device compares the time interval between adjacent first and second response sections among the calculated multiple response sections with a threshold value, and calculates one pass section passed by one railway vehicle or two pass sections passed by two railway vehicles. Therefore, this measurement device can accurately calculate the section where each of the multiple railway vehicles passed over the bridge.

[0142] One aspect of the measurement system is One aspect of the measurement device; the acceleration sensor; Equipped with.

[0143] One aspect of the measurement program is a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; on the computer, In the passing section calculation step, For adjacent first and second response intervals among the plurality of response intervals, if the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, one pass interval including the first response interval and the second response interval is calculated, and if the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively, are calculated.

[0144] In this measurement program, the computer compares the time interval between adjacent first and second response sections among the calculated multiple response sections with a threshold, and calculates one pass section passed by one railway vehicle or two pass sections passed by two railway vehicles. Therefore, according to this measurement program, the computer can accurately calculate the section where each of the multiple railway vehicles passed over the bridge. [Explanation of symbols]

[0145] 1...Measuring device, 2...Sensor, 3...Monitoring device, 4...Communication network, 5...Bridge, 6...Railway vehicle, 7...Superstructure, 7a...Bridge deck, 7b...Bearing, 7c...Rail, 7d...Sleeper, 7e...Ba Last, F... deck slab, G... main girder, 8... substructure, 8a... pier, 8b... abutment, 10... measurement system, 11... first communication unit, 12... second communication unit, 13... memory unit, 14... processor, 21... communication unit, 22... acceleration sensor, 23... processor, 24... memory unit, 31... communication unit, 32... processor, 33... display unit, 34... operation unit, 35... memory unit, 131... measurement program, 132... acceleration data, 133... measurement data, 141... acceleration data acquisition unit, 142... response section calculation unit, 143... passage section calculation unit, 144... passage section acceleration calculation unit, 145... displacement calculation unit, 146... measurement data output unit, 241... observation program, 242... acceleration data, 321... measurement data acquisition unit, 322... monitoring unit, 351... monitoring program, 352... measurement data string

Claims

1. a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; Including, In the passing section calculation step, a measurement method comprising: calculating, for adjacent first and second response intervals among the plurality of response intervals, one pass interval including the first response interval and the second response interval when the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold; and calculating, when the time interval is greater than the threshold, two pass intervals including the first response interval and the second response interval, respectively.

2. In claim 1, A measurement method, wherein the threshold value is greater than the time required for each of the plurality of railway vehicles to pass over the bridge.

3. In claim 2, A measurement method, wherein the threshold value is less than twice the time required for each of the plurality of railway vehicles to pass over the bridge.

4. In claim 1, In the passing section calculation step, When the time interval is equal to or less than the threshold, the one passing interval is calculated to start before the start time of the first response interval and end after the end time of the second response interval.

5. In claim 1, In the passing section calculation step, When the time interval is equal to or less than the threshold, the one passing interval is calculated, the passing interval starting at the start time of the first response interval and ending at the end time of the second response interval.

6. In claim 1, a passage section acceleration calculation step of calculating acceleration in each of the plurality of passage sections based on the acceleration data.

7. a response interval calculation unit that calculates a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation unit that calculates a plurality of passing sections along which each of the plurality of railway vehicles has passed over the bridge based on the plurality of response sections; Including, The passing section calculation unit a measurement device that calculates, for adjacent first and second response intervals among the plurality of response intervals, one passing interval including the first response interval and the second response interval when the time interval between the end time of the first response interval and the start time of the second response interval is equal to or less than a threshold, and calculates two passing intervals including the first response interval and the second response interval, respectively, when the time interval is greater than the threshold.

8. The measurement device according to claim 7 ; the acceleration sensor; A measurement system equipped with

9. a response interval calculation step of calculating a plurality of response intervals including responses of a plurality of railway vehicles traveling on the bridge to actions on the observation points based on acceleration data output from acceleration sensors installed at the observation points of the bridge; a passing section calculation step of calculating a plurality of passing sections along which each of the plurality of railway vehicles has passed through the bridge based on the plurality of response sections; on the computer, In the passing section calculation step, a measurement program that calculates, for adjacent first and second response intervals among the plurality of response intervals, one pass interval including the first response interval and the second response interval when a time interval between an end time of the first response interval and a start time of the second response interval is equal to or less than a threshold, and calculates two pass intervals including the first response interval and the second response interval, respectively, when the time interval is greater than the threshold.

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