Semi-active viscoelastic damper and method of operation thereof

Abstract

The present application relates to a kind of semi-active viscoelastic damper and its operating method, the damper includes respectively the outer force transmission plate and inner force transmission plate of first structure, second structure, sensor, controller, wherein, outer force transmission plate, inner force transmission plate produce relative movement when first structure and second structure vibrate;Outer force transmission plate is equipped with viscoelastic magnetic attraction piece, inner force transmission plate is equipped with permanent magnet, and viscoelastic magnetic attraction piece and permanent magnet can be mutually adsorbed;Controller can change the contact area of viscoelastic material (viscoelastic block) between inner and outer force transmission plate according to the structure motion state information collected by sensor by adjusting the adsorption state of viscoelastic magnetic attraction piece, to achieve the effect of changing viscoelastic damping force.Compared with prior art, the present application has the advantages of simple structure, less energy demand, flexible shear control force, high control precision, stable control effect, etc., can be used to cope with complex external excitation, to achieve better viscoelastic damping effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural vibration reduction, in particular to a semi-active viscoelastic damper and a running method thereof. BACKGROUND

[0002] At present, the viscoelastic damper has been widely applied in civil engineering and other fields at home and abroad. It mainly dissipates energy through the shear deformation of viscoelastic material to generate viscoelastic damping force, and has the advantages of strong vibration sensitivity, high energy consumption, simple structure and low cost. However, due to the strong temperature sensitivity of viscoelastic material, it is easily affected by environmental factors, and the traditional viscoelastic damper is passive control, which cannot well cope with complex excitation and environmental changes in actual engineering. Therefore, it is necessary to improve and upgrade the existing passive control viscoelastic damper to improve the self-adaptive ability and vibration reduction robustness of the viscoelastic damper.

[0003] For example, Chinese patent CN102287475A discloses a viscoelastic damper with intelligent controllable damping force, which mainly consists of a magnetic assembly, a controller and a sensor. The magnetic induction intensity in the magnetic circuit is changed by changing the current in the coil. The damper uses the rheological effect of the magnetic damping layer to compensate for the temperature softening effect of ordinary viscoelastic materials, so that the storage modulus of the viscoelastic material reduced due to temperature rise can be compensated by increasing the external magnetic field. However, the damper cannot maintain basic damping function in the case of viscoelastic material failure, which will lead to complete failure of the damper. SUMMARY

[0004] The purpose of the present application is to provide a semi-active viscoelastic damper and a running method thereof, which has good self-adaptive ability and vibration reduction robustness.

[0005] The purpose of the present application can be realized by the following technical solutions:

[0006] On the one hand, the present application provides a semi-active viscoelastic damper, which comprises an outer force transmission plate, an inner force transmission plate and a sensor. The outer force transmission plate is arranged on a first structure, and the inner force transmission plate is arranged on a second structure. The outer force transmission plate and the inner force transmission plate produce relative movement when the first structure and the second structure vibrate.

[0007] The outer force transmission plate is provided with a viscoelastic magnetic attraction piece capable of producing shear deformation, and the inner force transmission plate is provided with a permanent magnet. The viscoelastic magnetic attraction piece and the permanent magnet can be attracted to each other.

[0008] The sensor is used to monitor the movement information of the first structure and the second structure in real time. The sensor is connected with a controller capable of adjusting the energized state of the viscoelastic magnetic attraction piece.

[0009] Preferably, the motion information includes displacement, velocity, acceleration, etc. of the first structure and the second structure.

[0010] Further preferably, the sensor includes a displacement type sensor, an acceleration type sensor, etc.

[0011] Preferably, the controller is built-in with a control algorithm or an intelligent algorithm.

[0012] Preferably, the viscoelastic magnetic attraction piece includes an electromagnetic spring and a viscoelastic block, the electromagnetic spring can generate a strong magnetic attraction force to be adsorbed to a permanent magnet when energized, and the viscoelastic block can generate shear deformation to provide a viscoelastic damping force.

[0013] Preferably, one end of the viscoelastic block is connected to the outer force transmission plate, and the other end is connected to the electromagnetic spring, and the electromagnetic spring can stretch and contract along the axis direction of the viscoelastic magnetic attraction piece.

[0014] Preferably, a plurality of viscoelastic magnetic attraction pieces are provided, and at least 1 / 4 of the electromagnetic springs of the viscoelastic magnetic attraction pieces are provided with auxiliary permanent magnets at the end away from the viscoelastic block, so that the viscoelastic magnetic attraction pieces can be adsorbed to the permanent magnet and maintain the basic function of the viscoelastic damper when the electromagnetic spring is not energized.

[0015] Preferably, the viscoelastic magnetic attraction pieces are uniformly arranged at equal intervals on the outer force transmission plate, and the axis direction of the viscoelastic magnetic attraction pieces is perpendicular to the movement direction of the outer force transmission plate.

[0016] Further preferably, the interval is determined by the damper model, and generally 2-8mm is preferred.

[0017] In the present application, the size of the interval needs to be considered so that the shear deformation of the viscoelastic block of the viscoelastic magnetic attraction piece does not hinder the adsorption of the surrounding viscoelastic magnetic attraction pieces after adsorption.

[0018] In the present application, even if the ambient temperature is too high to cause the viscoelastic material (viscoelastic block) to fail, the electromagnetic spring can still provide nonlinear stiffness to maintain a certain damping function.

[0019] Preferably, the outer force transmission plate is clamped outside the inner force transmission plate.

[0020] Preferably, the outer force transmission plate has an open groove structure, and the viscoelastic magnetic attraction pieces are arranged on both sides of the inner wall of the open groove structure.

[0021] Preferably, the inner force transmission plate is a T-shaped structure matched with the open groove, and the T-shaped structure of the inner force transmission plate includes a transverse connecting part and a longitudinal embedding part connected vertically, and the permanent magnet is arranged on the axial surface of the longitudinal embedding part.

[0022] Preferably, the permanent magnet adopts a strong magnet, including a neodymium-iron-boron magnet.

[0023] Preferably, the outer force transmission plate is further provided with a piezoelectric energy harvester, which is electrically connected with the controller, and is used to convert mechanical energy generated by vibration of the first structure and the second structure into electrical energy and provide energy for the viscoelastic damper.

[0024] Preferably, the piezoelectric energy harvester is elastically connected with the inner force transmission plate through a self-resetting spring, which is arranged along the relative movement direction of the outer force transmission plate and the inner force transmission plate, and is used to reset the outer force transmission plate and the inner force transmission plate and transmit force to the piezoelectric energy harvester.

[0025] In the present application, the piezoelectric energy harvester can convert mechanical energy into electrical energy to meet the energy supply needs of the damper, and an external power supply can be connected to supply energy to the damper according to actual engineering needs.

[0026] In a second aspect, the present application further provides a running method of the semi-active viscoelastic damper, including the following steps:

[0027] S1: connecting the outer force transmission plate and the inner force transmission plate with the first structure and the second structure respectively to fix the viscoelastic damper;

[0028] S2: when the first structure and the second structure vibrate, the outer force transmission plate and the inner force transmission plate produce relative movement, the sensor converts the monitored movement information of the first structure and the second structure into a signal and transmits it to the controller; the controller adjusts the energized state of the viscoelastic magnetic adsorption piece according to the movement information fed back by the sensor, changes the number of viscoelastic magnetic adsorption pieces adsorbed to the permanent magnet, thereby adjusting the shear area of the viscoelastic block between the outer force transmission plate and the inner force transmission plate, and realizing the regulation and control of the viscoelastic damping force.

[0029] By dynamically adjusting the magnetic attraction force between the viscoelastic magnetic adsorption piece and the permanent magnet (the controller adjusts the energized state in real time according to the sensor feedback), the present application changes the contact area of the viscoelastic material between the inner and outer force transmission plates, and realizes self-adaptive control of the damping force. At the same time, in the case of failure of the viscoelastic material, the present application can provide a small amount of nonlinear stiffness based on the setting of the electromagnetic spring and the auxiliary permanent magnet, maintain a certain damping function, and avoid complete loss of the damping function of the entire damper. The piezoelectric energy harvester cooperates with the self-resetting spring to convert the mechanical energy of structure vibration into electrical energy to supply energy to the damper, reduce the dependence on external energy, and can be applied to power-free scenes. The present application has the advantages of simple structure, low energy demand, flexible shear control, and can be used to cope with complex external excitation to achieve better viscoelastic damping effect, has good practical application value, and meets the concept of environmental protection and energy saving.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] (1) The present application provides a semi-active viscoelastic damper, which can change the contact area of the viscoelastic material between the inner and outer force transmission plates by controlling the adsorption state of the viscoelastic magnetic adsorption part according to the structure motion state, thereby achieving the effect of changing the viscoelastic damping force, and having multi-stage vibration reduction and strong self-adaptive ability.

[0032] (2) The semi-active viscoelastic damper of the present application has multiple working performance guarantees, and requires less external energy. As a semi-active control system, it can provide considerable damping capacity and stiffness even if the external power is completely cut off.

[0033] (3) In the semi-active viscoelastic damper of the present application, at least 1 / 4 of the electromagnetic springs of the viscoelastic magnetic adsorption part are provided with auxiliary permanent magnets to ensure that they can be adsorbed on the permanent magnet without power supply, thereby maintaining the basic function of the viscoelastic damper. Even if the ambient temperature is too high to cause the viscoelastic material to fail, the electromagnetic spring can still provide a small amount of nonlinear stiffness to maintain a certain damping function.

[0034] (4) The semi-active viscoelastic damper of the present application has self-energy supply ability and self-resetting ability, and can even store energy to realize energy recycling when the vibration is small, which has good practical application value and meets the environmental protection and energy saving concept.

[0035] (5) The semi-active viscoelastic damper of the present application can realize flexible adjustment of shear control force, has high control precision and stable control effect, and can be used to cope with complex external excitation to achieve better viscoelastic damping effect, and has good self-adaptive ability and damping robustness. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic diagram of the semi-active viscoelastic damper (full adsorption) of the present application;

[0037] Figure 2 is a schematic diagram of the semi-active viscoelastic damper (partial adsorption) of the present application;

[0038] Figure 3 is a schematic diagram of the inner force transmission plate of the present application;

[0039] Figure 4 is a schematic diagram of the outer force transmission plate of the present application;

[0040] Figure 5 is a schematic diagram of the viscoelastic magnetic adsorption part device of the present application.

[0041] The figure label explanation: 1-outer force transmission plate, 2-inner force transmission plate, 3-sensor, 4-controller, 5-viscoelastic magnetic attraction piece, 51-viscoelastic block, 52-electromagnetic spring, 53-assistant permanent magnet, 6-permanent magnet, 7-self-resetting spring, 8-piezoelectric energy harvester. DETAILED DESCRIPTION

[0042] The present application will be described in detail below with reference to the drawings and specific embodiments. The embodiments are implemented on the premise of the technical solutions of the present application, and detailed implementation methods and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the following embodiments or examples, if there is no special description of the function parts or structures, it means that they are all conventional parts or conventional structures adopted in the field to realize the corresponding functions.

[0046] Embodiment 1

[0047] A semi-active viscoelastic damper, as shown in the figure, includes an outer force transmission plate 1, an inner force transmission plate 2 and a sensor 3. The outer force transmission plate 1 is mounted on a first structure, the inner force transmission plate 2 is mounted on a second structure, and the outer force transmission plate 1 and the inner force transmission plate 2 move relative to each other when the first and second structures vibrate. The outer force transmission plate 1 is provided with a viscoelastic magnetic attraction piece 5 capable of producing shear deformation, and the inner force transmission plate 2 is provided with a permanent magnet 6, and the two are attracted to each other. The sensor 3 monitors the movement information of the first and second structures in real time, and the controller 4 connected thereto is used to adjust the energization state of the viscoelastic magnetic attraction piece 5.

[0048] Embodiment 2

[0049] A semi-active viscoelastic damper, as shown in the figure, comprises an outer force transmission plate 1, an inner force transmission plate 2, a sensor 3, a controller 4, a viscoelastic magnetic attraction piece 5, a permanent magnet 6, a self-resetting spring 7 and a piezoelectric energy harvester 8. Figures 1-5

[0050] The outer force transmission plate 1 is installed on a first structure, the inner force transmission plate 2 is installed on a second structure, the outer force transmission plate 1 is clamped on the outer side of the inner force transmission plate 2, and the outer force transmission plate 1 and the inner force transmission plate 2 move relatively when the first and second structures vibrate. In this embodiment, the outer force transmission plate 1 has an open groove structure, and the inner force transmission plate 2 has a T-shaped structure matching the open groove.

[0051] The viscoelastic magnetic attraction piece 5 is provided with multiple pieces and is arranged uniformly at the same interval on the inner wall of the open groove structure of the outer force transmission plate 1, and the axis direction thereof is perpendicular to the movement direction of the outer force transmission plate 1. The viscoelastic magnetic attraction piece 5 comprises an electromagnetic spring 52 and a viscoelastic block 51, one end of the viscoelastic block 51 is connected with the outer force transmission plate 1, the other end is connected with the electromagnetic spring 52, and the electromagnetic spring 52 can stretch and contract along the axis direction of the viscoelastic magnetic attraction piece 5. The electromagnetic spring 52 can generate a strong magnetic attraction force when electrified to make the viscoelastic magnetic attraction piece 5 adsorbed to the permanent magnet 6, and the viscoelastic block 51 can generate a shear deformation to provide a viscoelastic damping force.

[0052] The T-shaped structure of the inner force transmission plate 2 comprises a transverse connecting part and a longitudinal embedding part connected vertically, and the permanent magnet 6 is arranged on the axial two side surfaces of the longitudinal embedding part. In this embodiment, the permanent magnet 6 adopts a neodymium iron boron magnet to provide a strong magnetic attraction force.

[0053] In this embodiment, at least 1 / 4 of the viscoelastic magnetic attraction piece 5 is provided with an auxiliary permanent magnet 53 at the end of the electromagnetic spring 52 away from the viscoelastic block 51, which is used to adsorb part of the viscoelastic magnetic attraction piece 5 to the permanent magnet 6 without electrifying the electromagnetic spring 52, so as to maintain the basic function of the viscoelastic damper.

[0054] The sensor 3 monitors the movement information of the first structure and the second structure in real time, the sensor 3 is connected with the controller 4, and the controller 4 adjusts the electrification state of the electromagnetic spring 52 in the viscoelastic magnetic attraction piece 5, so as to change the magnetic attraction force.

[0055] The piezoelectric energy harvester 8 is arranged on the outer force transmission plate 1 and is elastically connected with the inner force transmission plate 2 through the self-resetting spring 7, the self-resetting spring 7 is arranged along the relative movement direction of the outer force transmission plate 1 and the inner force transmission plate 2, is used for resetting the outer force transmission plate 1 and the inner force transmission plate 2, and transmits the acting force to the piezoelectric energy harvester 8. The piezoelectric energy harvester 8 is electrically connected with the controller 4, is used for converting the mechanical energy generated when the first structure and the second structure vibrate into electric energy and supplying energy for the viscoelastic damper.

[0056] When the semi-active viscoelastic damper provided in this embodiment operates,​

[0057] (1) First, the outer force transmission plate 1 and the inner force transmission plate 2 are respectively connected with the first structure and the second structure to realize the fixation of the viscoelastic damper;

[0058] (2) When the first structure and the second structure vibrate, the outer force transmission plate 1 and the inner force transmission plate 2 produce relative motion, the sensor 3 converts the monitored motion information of the first structure and the second structure into signals and transmits them to the controller 4; the controller 4 adjusts the energized state of the viscoelastic magnetic attraction piece 5 according to the motion information fed back by the sensor 3, changes the number of viscoelastic magnetic attraction pieces 5 adsorbed to the permanent magnet 6, thereby adjusting the shear area of the viscoelastic block 51 between the outer force transmission plate 1 and the inner force transmission plate 2, and realizing the regulation and control of the viscoelastic damping force.

[0059] The above description of the embodiments is for the purpose of facilitating the understanding and use of the invention by those skilled in the art. Those skilled in the art can obviously make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to go through creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A semi-active viscoelastic damper, characterized in that, it comprises an outer force transmission plate (1), an inner force transmission plate (2), and a sensor (3), the outer force transmission plate (1) is arranged on a first structure, the inner force transmission plate (2) is arranged on a second structure, and the outer force transmission plate (1) and the inner force transmission plate (2) generate relative movement when the first structure and the second structure vibrate; the outer force transmission plate (1) is provided with a viscoelastic magnetic attraction piece (5) capable of generating shear deformation, the inner force transmission plate (2) is provided with a permanent magnet (6), and the viscoelastic magnetic attraction piece (5) and the permanent magnet (6) can be attracted to each other; the sensor (3) is used for monitoring the movement information of the first structure and the second structure in real time, and the sensor (3) is connected with a controller (4) capable of adjusting the energized state of the viscoelastic magnetic attraction piece (5); the viscoelastic magnetic attraction piece (5) comprises an electromagnetic spring (52) and a viscoelastic block (51), the electromagnetic spring (52) can generate a strong magnetic attraction force to be attracted to the permanent magnet (6) when energized, and the viscoelastic block (51) can generate shear deformation to provide viscoelastic damping force; one end of the viscoelastic block (51) is connected with the outer force transmission plate (1), and the other end is connected with the electromagnetic spring (52), and the electromagnetic spring (52) can stretch and contract along the axial direction of the viscoelastic magnetic attraction piece (5); the outer force transmission plate (1) is clamped outside the inner force transmission plate (2), the outer force transmission plate (1) has an open groove structure, and the viscoelastic magnetic attraction piece (5) is arranged on the inner wall of the open groove structure; the inner force transmission plate (2) is a T-shaped structure matched with the open groove, the T-shaped structure of the inner force transmission plate (2) comprises a transverse connecting part and a longitudinal embedding part connected perpendicularly, the permanent magnet (6) is arranged on the axial two side surfaces of the longitudinal embedding part, and the permanent magnet (6) is a strong magnet.

2. A semi-active viscoelastic damper according to claim 1, wherein A plurality of viscoelastic magnetic attraction pieces (5) are arranged, at least 1 / 4 of the viscoelastic magnetic attraction pieces (5) are provided with auxiliary permanent magnets (53) at the end away from the viscoelastic block (51) of the electromagnetic spring (52), so that part of the viscoelastic magnetic attraction pieces (5) can be attracted to the permanent magnet (6) without energizing the electromagnetic spring (52), thereby maintaining the basic function of the viscoelastic damper.

3. A semi-active viscoelastic damper according to claim 1, wherein The viscoelastic magnetic attraction pieces (5) are arranged on the outer force transmission plate (1) at the same interval, the interval is 2-8 mm, and the axial direction of the viscoelastic magnetic attraction pieces (5) is perpendicular to the movement direction of the outer force transmission plate (1).

4. A semi-active viscoelastic damper according to claim 1, wherein The strong magnet comprises a neodymium-iron-boron magnet.

5. A semi-active viscoelastic damper according to claim 1, wherein A piezoelectric energy harvester (8) is further arranged on the outer force transmission plate (1), the piezoelectric energy harvester (8) is electrically connected with the controller (4), and the piezoelectric energy harvester (8) is used for converting mechanical energy generated when the first structure and the second structure vibrate into electrical energy to supply energy for the viscoelastic damper.

6. A semi-active viscoelastic damper according to claim 5, wherein The piezoelectric energy harvester (8) is elastically connected with the inner force transmission plate (2) through a self-resetting spring (7), the self-resetting spring (7) is arranged along the relative movement direction of the outer force transmission plate (1) and the inner force transmission plate (2), and the self-resetting spring (7) is used for resetting the outer force transmission plate (1) and the inner force transmission plate (2) and transmitting the acting force to the piezoelectric energy harvester (8).

7. A method of operating a semi-active viscoelastic damper as claimed in any one of claims 1 to 6, characterised by: The method comprises the following steps: S1: the outer force transmission plate (1) and the inner force transmission plate (2) are connected with the first structure and the second structure respectively, and the fixing of the viscoelastic damper is realized; S2: when the first structure and the second structure vibrate, the outer force transmission plate (1) and the inner force transmission plate (2) generate relative movement, the sensor (3) converts the monitored movement information of the first structure and the second structure into a signal and transmits the signal to the controller (4); the controller (4) adjusts the energized state of the viscoelastic magnetic adsorption piece (5) according to the movement information fed back by the sensor (3), changes the number of the viscoelastic magnetic adsorption pieces (5) adsorbed to the permanent magnet (6), thereby adjusts the shearing area of the viscoelastic block (51) between the outer force transmission plate (1) and the inner force transmission plate (2), and realizes the regulation and control of the viscoelastic damping force.

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