Collision test system for viscous damper

Abstract

The invention relates to the technical field of engineering seismic mitigation and isolation, in particular to a viscous damper collision test system, which comprises two transition plates arranged in parallel; the two ends of the viscous damper are fixedly mounted between the two transition plates through the viscous damper end plates; the force limiting friction damper is fixedly arranged on the outer surface of the transition plate on one side and is connected with loading equipment through a connecting lug plate; energy is dissipated through viscous fluid resistance; if the load does not exceed the preset limit, the viscous damper only deforms normally, the piston does not make contact with the oil cylinder, the force-limiting friction damper is installed on the outer side of the transition plate, is connected with loading equipment through the connecting lug plate and is connected with the viscous damper in series, and when the load exceeds a threshold value, the force-limiting friction damper starts sliding friction energy consumption; threshold force is set through friction interface pre-tightening force, it is ensured that sliding is preferentially carried out during overload so as to reduce the counter-force peak value, and meanwhile comparison data of energy consumption efficiency and response characteristics are formed with the viscous damper.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering seismic isolation and vibration reduction, and particularly to a collision test system for viscous dampers. Background Art

[0002] Viscous dampers can effectively protect engineering structures during earthquakes. With the large-scale application of viscous dampers, there have successively emerged cases where viscous dampers are damaged due to exceeding the deformation limit state for various reasons during earthquake disasters. When a viscous damper exceeds the deformation limit, it may cause the piston to collide with the oil cylinder, resulting in drastic changes in damping force, internal force, stiffness, etc., which may have an adverse impact on the structure, and at the same time cause damage and performance degradation of the damper.

[0003] In order to study the influence of a viscous damper exceeding the limit state, it is necessary to experimentally simulate its behavior when exceeding the deformation limit state. If a loading device is directly used to apply excessive deformation beyond the deformation capacity of the viscous damper to achieve the collision between the piston and the oil cylinder, the large impact force generated at the moment of collision is difficult to control. The excessive impact force may damage the viscous damper specimen, making the specimen unable to be used for repeated tests and parameter analysis. The excessive impact force may also affect the reliability and service life of the loading device at the same time.

[0004] In view of this, a collision test system for viscous dampers is provided to overcome the above defects. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a collision test system for viscous dampers is proposed. By connecting the collision component in parallel with the viscous damper, the collision between the piston and the oil cylinder of the viscous damper caused by exceeding the limit deformation capacity is simulated through the collision between the elastic component and the collision plate. The viscous damper itself will not reach the limit deformation during the loading test and will not actually experience the collision between the piston and the oil cylinder, thus avoiding damage to the viscous damper specimen. In addition, when the collision component is connected in parallel with the viscous damper, we can use the same viscous damper to test the deformation of the viscous damper under more displacement conditions. In addition, in order to prevent a moment from acting on the viscous damper after the collision, we install collision components on both the upper and lower parts of the viscous damper to offset the moment on the central axis. When the elastic component of the collision component collides with the collision plate, a large reaction force will be generated instantaneously. When the reaction force is too large, it will damage the loading device. For this, the solution we adopt is to connect the force-limiting friction damper in series with the viscous damper and the collision component. When the elastic component of the collision component collides with the collision plate, a large reaction force is generated instantaneously. When the reaction force exceeds the starting slip force of the force-limiting friction damper, the force-limiting friction damper deforms, thus avoiding damage to the loading device caused by excessive reaction force.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions: Viscous damper collision test system, comprising Two transition plates arranged in parallel; A viscous damper, both ends of which are fixedly installed between the two transition plates through the viscous damper end plates; A force-limiting friction damper, fixedly arranged on the outer surface of one of the transition plates, and connected to the loading device through a connecting ear plate; A detachable collision assembly, spanning between the two transition plates, including a support guide rod, a collision block arranged on the support guide rod, and collision plates with adjustable spacing on both sides; Wherein, by adjusting the spacing of the collision plates, the collision behavior between the piston and the cylinder block of the viscous damper under different ultimate strokes can be simulated by the contact between the collision block and the collision plates, while avoiding the actual collision between the piston and the cylinder block from damaging the viscous damper specimen; By adjusting the stiffness of the collision block, the different stiffnesses when the piston and the cylinder block of the viscous damper collide under the ultimate stroke can be simulated by the contact between the collision block and the collision plates; When the collision block contacts the collision plate, if the resultant force generated by the viscous damper and the collision assembly exceeds the starting slip force of the force-limiting friction damper, the force-limiting friction damper will slip, avoiding damage to the loading device.

[0007] As a further description of the above technical solution: The collision assembly includes a support guide rod arranged between the two transition plates; Wherein the support guide rod is fixedly connected to the transition plate away from the force-limiting friction damper, and the support guide rod is slidably connected to the other transition plate. A collision block is fixedly arranged on the support guide rod, and collision plates are arranged on both sides of the collision block. Internal thread blocks are rotatably arranged at the four corner positions of the collision plates. A lead screw is helically connected inside the internal thread block, and the lead screw is slidably connected to the transition plate away from the force-limiting friction damper; By rotating the internal thread block to drive the collision plate to translate, continuous or stepped adjustment of the spacing is achieved.

[0008] As a further description of the above technical solution: The collision block includes: Symmetrically arranged polymer polyurethane elastic components, the opposite surfaces of which are integrally formed with elastic component end plates; An elastic component connecting plate detachably connecting the two elastic component end plates; When the elastic component contacts the collision plate, the elastic component compresses and deforms to absorb impact energy, and generates an instantaneous reaction force to trigger the slip of the force-limiting friction damper.

[0009] As a further description of the above technical solution: There are two sets of collision components, symmetrically distributed on the upper and lower sides of the viscous damper, used to offset the eccentric moment generated by the collision and improve the accuracy of test data.

[0010] As a further description of the above technical solution: An avoidance groove is provided inside the collision plate, and the upper end of the avoidance groove is open, which is used for the quick disassembly and replacement of the support guide rod.

[0011] As a further description of the above technical solution: The viscous damper and the force-limiting friction damper are connected in series, and the force-displacement characteristic curves of the two can be synchronously recorded under the same load, which is used to compare the energy dissipation efficiency and the difference in nonlinear response.

[0012] As a further description of the above technical solution: One end of the support guide rod and the lead screw is connected to the transition plate through an insert bearing, and the other end is fixed by bolts.

[0013] As a further description of the above technical solution: An avoidance groove is provided inside the collision plate, and the upper end of the avoidance groove is open.

[0014] As a further description of the above technical solution: The lead screw is integrally formed by a threaded rod and a sliding rod, and a detachable limiting end is provided at one end of the sliding rod away from the threaded rod.

[0015] As a further description of the above technical solution: The lead screw is integrally formed by a threaded rod and a sliding rod, and one end of the sliding rod away from the thread is fixedly connected to the limiting end.

[0016] The present invention has the following beneficial effects: The viscous damper collision test system designed by the present invention is composed of a viscous damper, a force-limiting friction damper, a collision component and a connecting ear plate. The viscous damper is fixed between two transition plates, and its two ends are bolted to the transition plates through viscous damper end plates, forming a main energy dissipation structure. When an external load is applied, the piston of the viscous damper moves in the oil cylinder and dissipates energy through the viscous fluid resistance. If the load does not exceed the preset limit, the viscous damper only undergoes normal deformation and the piston does not contact the oil cylinder. The force-limiting friction damper is installed outside the transition plate and is connected to the loading device through a connecting ear plate, in series with the viscous damper. When the load exceeds the threshold value, the force-limiting friction damper starts sliding friction energy dissipation, and its threshold force is set by the pre-tightening force of the friction interface, ensuring that it slips first when overloaded to reduce the peak reaction force, and at the same time forming comparison data of energy dissipation efficiency and response characteristics with the viscous damper.

[0017] The modular design of this system supports quick switching of experimental modes, is suitable for the limit test requirements of dampers in multiple scenarios such as seismic structures and aerospace equipment, and provides an efficient experimental platform for optimizing damper design parameters and verifying protection strategies. Description of the Drawings

[0018] Figure 1 This is a schematic diagram of the collision test system for the viscous damper of the present invention; Figure 2 This is a schematic diagram of the lead screw and the collision plate of the collision test system for the viscous damper of the present invention; Figure 3 This is a schematic diagram of the support guide rod structure of the collision test system for the viscous damper of the present invention; Figure 4 This is a schematic diagram of the structure of the collision plate of the collision test system for the viscous damper of the present invention; Figure 5 This is a schematic diagram of the structure of the lead screw of the collision test system for the viscous damper of the present invention.

[0019] Legend description: 1. Force-limiting friction damper; 2. Transition plate; 3. Viscous damper end plate; 4. Viscous damper; 5. Support guide rod; 6. Lead screw; 61. Sliding rod, 62. Threaded rod, 63. Limit end; 7. Collision plate; 8. Elastic component; 9. Elastic component end plate; 10. Elastic component connecting plate; 11. Force-limiting friction damper end plate; 12. Connecting ear plate, 13 - Avoidance groove, 14 - Internal thread block. Detailed implementation manners

[0020] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] Please refer to Figures 1-3In this regard, the present invention provides a technical solution: A viscous damper collision test system, comprising: A viscous damper 4, which is fixedly arranged between two transition plates 2. When the viscous damper 4 is subjected to an external experimental load, the internal piston displaces. When the load exceeds the limit, the internal piston of the viscous damper 4 will collide with the oil cylinder, causing damage to the viscous damper 4. A force-limiting friction damper 1, which is fixedly arranged on the outer side of one of the transition plates 2. When the load exceeds the threshold, the force-limiting friction damper 1 works. The force-limiting friction damper 1 dissipates energy through sliding friction and is connected in series with the viscous damper 4 in the experiment, so as to compare the energy dissipation efficiency, response speed and non-linear characteristics of the two. A collision assembly, which is detachably arranged between the two transition plates 2. When the applied experimental load exceeds the limit range, the collision assembly is used to simulate the collision between the piston and the oil cylinder of the viscous damper 4 due to exceeding the limit deformation ability. A connecting ear plate 12, which is fixedly arranged at the other end of the force-limiting friction damper 1 away from the viscous damper 4. The loading device is connected to the force-limiting friction damper 1 through the connecting ear plate 12.

[0024] In the above, when the applied experimental load exceeds the limit range, the collision assembly is used to simulate the collision between the piston and the oil cylinder of the viscous damper 4 due to exceeding the limit deformation ability, while the viscous damper 4 itself will not reach the limit deformation during the loading test and will not actually have a collision between the piston and the oil cylinder, thereby avoiding damage to the viscous damper 4 specimen.

[0025] As Figures 2-3 shown in: The collision assembly includes a support guide rod 5 arranged between the two transition plates 2, wherein the support guide rod 5 is fixedly connected to the transition plate 2 away from the force-limiting friction damper 1, and the support guide rod 5 is slidably connected to the other transition plate 2. A collision block is fixedly arranged on the support guide rod 5, and collision plates 7 are arranged on both sides of the collision block. Internal thread blocks 14 are rotatably arranged at the four corner positions of the collision plates 7. A lead screw 6 is helically connected inside the internal thread blocks 14. The lead screw 6 is slidably connected to the transition plate 2 away from the force-limiting friction damper 1, and the lead screw 6 is fixedly connected to the transition plate 2 away from the force-limiting friction damper 1 through a nut. Thus, when the viscous damper collision test system conducts a loading experiment, the distance between the collision plates 7 is controlled by the internal thread blocks 14, and according to different distances, it can be divided into two modes: The first type is that the collision block does not collide with the collision plate 7, simulating the situation where the viscous damper 4 has not reached the stroke limit: During the experiment, the distance between the collision plate 7 and the collision block is adjusted to be greater than the loading displacement distance of the viscous damper 4. When the loading device works, the load drives the right transition plate 2 to move, driving the deformation of the viscous damper 4, and testing the mechanical behavior and energy dissipation capacity of the viscous damper 4. At the same time, the right transition plate 2 moves, driving the screw rod 6 to move, and then driving the displacement of the collision plate 7. However, since the distance between the collision plate 7 and the collision block is greater than the loading displacement distance of the viscous damper 4, the collision plate 7 and the collision block will not collide. At this time, the starting slip force of the limited force friction damper 1 is set to be greater than the maximum damping force that the viscous damper 1 may generate, and the limited force friction damper 1 does not slide.

[0026] The second type is that the collision block collides with the collision plate 7, simulating the situation where the viscous damper 4 reaches the stroke limit: When it is necessary to test the performance of the viscous damper 4 when it reaches the limit stroke, it is necessary to rotate the internal thread block 14 to drive the collision plates 7 on both the left and right sides to move towards the collision block, so that the distance between the collision plate 7 and the collision block is less than the loading displacement distance of the viscous damper 4. When the loading device works, the load drives the right transition plate 2 to move, driving the deformation of the viscous damper 4 and the displacement of the collision plate 7. Since the distance between the collision plate 7 and the collision block is less than the loading displacement distance of the viscous damper 4, the collision plate 7 and the collision block will collide at the set displacement. At this time, the mechanical behavior and energy dissipation capacity of the viscous damper 4 can be tested under the simulated stroke limit state. The large reaction force generated at the moment of collision exceeds the starting slip force of the limited force friction damper 1, and the limited force friction damper 1 slides to protect the loading device from being damaged due to excessive reaction force.

[0027] As Figure 2 shown in: The collision block includes an elastic component 8, an elastic component end plate 9, and an elastic component connecting piece 10. There are two elastic components 8, which are symmetrically arranged and are both made of high molecular polyurethane material. The elastic component end plate 9 is integrally formed with the elastic component 8, and the elastic component end plate 9 is detachably connected through the elastic component connecting plate 10. In this way, when the elastic component 8 collides with the collision plate 7, the elastic component 8 made of high molecular polyurethane compresses and deforms, absorbs the impact energy, and generates an instantaneous reaction force. When the reaction force exceeds the starting slip threshold of the limited force friction damper 1, the friction damper slides to dissipate energy, avoiding overloading and damage of the loading device. At the same time, the collision block can be replaced according to actual needs, and thus the stiffness of the collision block can be adjusted. Different stiffnesses can be simulated when the piston and the cylinder body of the viscous damper collide at the limit stroke by the contact between the collision block and the collision plate.

[0028] As Figure 1As shown in the figure: both ends of the viscous damper 4 are fixedly connected with viscous damper end plates 3, and the viscous damper end plates 3 are connected to the transition plate 2 through bolts provided. In this way, when the viscous damper 4 is damaged due to collision, the replacement of the viscous damper 4 is realized through the disassembly of the viscous damper end plates 3.

[0029] Still as Figure 1 As shown in the figure: one side of the lead screw 6 and the support guide rod 5 is connected to the filter plate 2 by inserting bearings, and the other side is installed on the filter plate 2 through bolts. In this way, by loosening the bolts of the support guide rod 5 and the transition plate 2, and then loosening the bolts of the lead screw 6 and the transition plate 2, and pulling them out from the inserted bearings, and then specifically disassembling, repairing or replacing the damaged parts of the collision assembly.

[0030] As Figure 1 As shown in the figure: there are two groups of collision assemblies, which are connected in parallel with the viscous damper 4 up and down, avoiding the influence of the overall eccentric moment generated after the collision on the test data, making the test data more accurate and reducing errors.

[0031] As Figure 4 As shown in the figure: an avoidance groove 13 is provided inside the collision plate 7, and the upper end of the avoidance groove 13 is open. In this way, it is convenient for the disassembly of the support guide rod 5 and improves the disassembly efficiency.

[0032] As Figure 5 As shown in the figure: the lead screw 6 includes a threaded rod 62 and a sliding rod 61 integrally formed, and one end of the sliding rod 61 away from the threaded rod 62 is detachably connected to the limit end 63 by a screw. The transition plate 2 away from the limited force friction damper 1 is slidably connected to the lead screw 6 through the sliding rod 61, and the displacement is limited by the provided limit end 63.

[0033] Working principle: Through the series design of the viscous damper 4 and the limited force friction damper 1, combined with the adjustable collision assembly, the system realizes the performance test and protection of the viscous damper under extreme loads. The viscous damper 4 is fixed between the two transition plates 2. Under the action of external loads, the internal piston of the viscous damper displaces. When the load exceeds the limit, the collision assembly simulates the collision behavior between the piston and the oil cylinder: The first type of collision block does not collide with the collision plate 7, simulating the situation where the viscous damper 4 has not reached the stroke limit: During the experiment, the distance between the collision plate 7 and the collision block is adjusted to be greater than the loading displacement distance of the viscous damper 4. When the loading device works, the load drives the right transition plate 2 to move, driving the deformation of the viscous damper 4, and testing the mechanical behavior and energy dissipation capacity of the viscous damper 4. At the same time, the right transition plate 2 moves, driving the lead screw 6 to move, and then driving the displacement of the collision plate 7. However, since the distance between the collision plate 7 and the collision block is greater than the loading displacement distance of the viscous damper 4, the collision plate 7 and the collision block will not collide. At this time, the starting slip force of the force-limiting friction damper 1 is set to be greater than the maximum damping force that the viscous damper 1 may generate, and the force-limiting friction damper 1 does not slip.

[0034] The second type of collision block collides with the collision plate 7, simulating the situation where the viscous damper 4 has reached the stroke limit: When it is necessary to test the performance of the viscous damper 4 when it reaches the limit stroke, it is necessary to rotate the internal thread block 14 to drive the collision plates 7 on both the left and right sides to move towards the collision block, so that the distance between the collision plate 7 and the collision block is less than the loading displacement distance of the viscous damper 4. When the loading device works, the load drives the right transition plate 2 to move, driving the deformation of the viscous damper 4 and the displacement of the collision plate 7. Since the distance between the collision plate 7 and the collision block is less than the loading displacement distance of the viscous damper 4, the collision plate 7 and the collision block will collide at the set displacement. At this time, the mechanical behavior and energy dissipation capacity of the viscous damper 4 can be tested under the simulated stroke limit state. The large reaction force generated at the moment of collision exceeds the starting slip force of the force-limiting friction damper 1, and the force-limiting friction damper 1 slides to protect the loading device from being damaged due to excessive reaction force.

[0035] The viscous damper 4 is disassembled and replaced by bolts on the end plate of the viscous damper; the collision assembly is removed from the transition plate 2 by loosening the bolts of the support guide rod 5 and the lead screw 6 for maintenance.

[0036] Through the designed upper and lower parallel collision assembly design and the avoidance groove 13 structure, the eccentric moment interference can be eliminated, and the test accuracy can be improved; the sliding rod 61 of the lead screw 6 cooperates with the limit end 63 to control the displacement range to ensure the safety and controllability of the test.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. Viscous damper collision test system, characterized in that: including two transition plates (2) arranged in parallel; a viscous damper (4), the two ends of which are fixedly installed between the two transition plates (2) through viscous damper end plates (3); a force-limiting friction damper (1), fixedly arranged on the outer surface of one of the transition plates (2), and connected to a loading device through a connecting ear plate (12); a detachable collision assembly, spanning between the two transition plates (2), including a support guide rod (5), a collision block arranged on the support guide rod (5), and collision plates (7) with adjustable spacing on both sides; wherein, by adjusting the spacing of the collision plates (7), the collision behavior between the piston and the cylinder block of the viscous damper under different ultimate strokes can be simulated by the contact between the collision block and the collision plates (7), while avoiding the actual collision between the piston and the cylinder block from damaging the viscous damper specimen; by adjusting the stiffness of the collision block, the different stiffnesses when the piston and the cylinder block of the viscous damper collide under the ultimate stroke can be simulated by the contact between the collision block and the collision plates; when the collision block contacts the collision plate (7), if the resultant force generated by the viscous damper (4) and the collision assembly exceeds the starting slip force of the force-limiting friction damper, the force-limiting friction damper (1) will slip, avoiding damage to the loading device.

2. The viscous damper collision test system according to claim 1, characterized in that: The collision assembly includes a support guide rod (5) arranged between the two transition plates (2); wherein the support guide rod (5) is fixedly connected to the transition plate (2) far from the force-limiting friction damper (1), and the support guide rod (5) is slidably connected to the other transition plate (2). A collision block is fixedly arranged on the support guide rod (5), and collision plates (7) are arranged on both sides of the collision block. Internal thread blocks (14) are rotatably arranged at the four corner positions of the collision plates (7), and a lead screw (6) is spirally connected inside the internal thread blocks (14). The lead screw (6) is slidably connected to the transition plate (2) far from the force-limiting friction damper (1); By rotating the internal thread block (14) to drive the collision plate (7) to translate, continuous or stepped adjustment of the spacing is achieved.

3. The viscous damper collision test system according to claim 1, characterized in that, The collision block includes: symmetrically arranged polymer polyurethane elastic components (8), the opposite surfaces of which are integrally formed with elastic component end plates (9); an elastic component connecting plate (10) detachably connecting the two elastic component end plates (9); when the elastic component (8) contacts the collision plate (7), the elastic component (8) compresses and deforms to absorb the impact energy, and generates an instantaneous reaction force to trigger the slip of the force-limiting friction damper (1).

4. The viscous damper impact test system according to claim 1, wherein There are two groups of the collision assemblies, symmetrically distributed on the upper and lower sides of the viscous damper (4), used to offset the eccentric moment generated by the collision and improve the accuracy of test data.

5. The viscous damper collision test system according to claim 1, characterized in that, An avoidance groove (13) is arranged inside the collision plate (7), and the upper end of the avoidance groove (13) is open, for the quick disassembly and replacement of the support guide rod (5).

6. The viscous damper collision test system according to claim 1, characterized in that The viscous damper (4) and the force-limiting friction damper (1) are connected in series, and the force-displacement characteristic curves of the two can be synchronously recorded under the same load, for comparing the energy dissipation efficiency and the differences in non-linear responses.

7. The viscous damper collision test system according to claim 1, characterized in that, One end of the support guide rod (5) and the lead screw (6) is connected to the transition plate (2) through an insert bearing, and the other end is fixed by bolts.

8. The viscous damper collision test system according to claim 2, characterized in that, An avoidance groove (13) is provided inside the collision plate (7), and the upper end of the avoidance groove (13) is open.

9. The viscous damper collision test system according to claim 2, characterized in that The lead screw (6) includes a threaded rod (62) and a sliding rod (61) integrally formed, and a detachable limit end (63) is provided at one end of the sliding rod (61) away from the threaded rod (62).

Images