Pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction

Abstract

The invention discloses a pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction. The pedestrian bridge vibration comfort evaluation platform comprises a self-energized sensing vibration force measurement platform and an analysis control system, the self-energized sensing vibration force measuring platform comprises a plurality of self-energized sensing force measuring tables and a servo control motor; friction nanometer generator self-powered three-way force measuring blocks are densely distributed on the self-powered sensing force measuring table; the analysis control system comprises a data acquisition module, a feedback control module and a data output module, acquires a three-dimensional pedestrian load on the self-energized sensing vibration force measuring platform in real time, calculates bridge dynamic response based on a pedestrian bridge finite element model, and further feeds back and controls the vibration state of the self-energized sensing vibration force measuring platform to simulate the actual vibration condition of the bridge; and finally, evaluating the vibration comfort of the bridge according to the dynamic response characteristics of the bridge in the whole loading process. According to the invention, real-time interaction between the computer end and the self-energized sensing vibration force-measuring platform is realized, sensing energy consumption is reduced, and a pedestrian bridge vibration comfort assessment result closer to a real situation is obtained.

Description

Technical Field

[0001] The invention relates to the field of bridge vibration comfort evaluation, and in particular to a pedestrian bridge vibration comfort evaluation platform taking into account human-bridge interaction. Background Art

[0002] In recent years, pedestrian bridges have been popularly constructed with high-strength and lightweight materials, which make them soft, low-damping, and have low natural frequencies. Such bridges may often produce uncomfortable human-induced vibrations, and it is necessary to conduct human-induced vibration response analysis in the design stage and evaluate their vibration comfort based on the response results. Existing human-induced vibration response analysis methods usually directly represent pedestrian loads as simplified models such as Fourier series moving load models, MSD models, or bipedal models with fixed parameters to carry out bridge vibration response calculations. However, the methods based on the above simplified pedestrian load models cannot fully consider the impact of human-bridge interaction on bridge vibration response, that is, after pedestrians perceive bridge vibrations, they adjust their own cadence, stride length, and trajectory, which causes changes in the size and temporal and spatial distribution of walking force, thereby affecting the bridge vibration response.

[0003] In addition, bridge vibration comfort assessment often divides pedestrian loads into three load components: vertical, horizontal, and longitudinal. Existing force platforms that can directly and simultaneously measure three-dimensional pedestrian loads mostly obtain the resultant force on the surface of the force platform through strain gauges or quartz piezoelectric force sensors installed at the four corners of the force platform, but cannot obtain the distribution of the three-dimensional forces on the surface of the force platform, and any failure of a single force sensor will cause the entire force platform to fail. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a pedestrian bridge vibration comfort evaluation platform that takes into account the human-bridge interaction. Through real-time interaction between the computer end and the self-powered sensing vibration force measuring platform, while reducing energy consumption, the interaction between pedestrian loads and the lateral vibration of the bridge is fully considered, thereby achieving an evaluation of the bridge vibration comfort that is closer to the actual situation.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction, including a self-powered sensing vibration force measurement platform and an analysis and control system;

[0007] The self-powered sensing vibration force measuring platform comprises a servo control motor and a plurality of self-powered sensing force measuring platforms closely arranged in parallel along the direction of travel of the pedestrian; the self-powered sensing force measuring platform is densely covered with a friction nanogenerator (TENG) self-powered three-way force measuring block, and the TENG self-powered three-way force measuring block is located in a fixed grid of the base of the self-powered sensing force measuring platform; the servo control motor controls the self-powered sensing force measuring platform to move perpendicular to the direction of travel of the pedestrian;

[0008] The analysis and control system includes a data acquisition module, a feedback control module and a data output module;

[0009] The data acquisition module collects the vibration signals of each of the self-powered sensing force platforms and the three-dimensional pressure signals output by the TENG self-powered three-dimensional force measuring block in real time through a data acquisition device, converts the three-dimensional pressure signals into three-dimensional pedestrian loads and corrects them, and then associates the position numbers of the TENG self-powered three-dimensional force measuring blocks with the three-dimensional pedestrian load values ​​to obtain the three-dimensional pedestrian load distribution on the self-powered sensing vibration force measuring platform;

[0010] The feedback control module applies the corrected pedestrian load obtained by the data acquisition module at the current time step to the corresponding position of the bridge surface of the bridge finite element model, calculates the dynamic response of the bridge, and outputs a vibration control signal to update the vibration state of the self-powered sensing vibration force measurement platform at the next time step to simulate the vibration response of the bridge;

[0011] After the test is completed, the data output module outputs the bridge dynamic response time history and characteristic values, pedestrian load time history and characteristic values, and bridge vibration comfort evaluation results obtained during the test.

[0012] Furthermore, the TENG self-powered three-way force measuring block includes a TENG sensor array, a sensor signal integrated processing single chip, a shell and an inspection cover; the TENG self-powered three-way force measuring block has a unique number according to its position on the self-powered sensing vibration force measuring platform.

[0013] Furthermore, the TENG sensor array is composed of multiple TENG sensors, which are fixed to the outside of the shell and are divided into a vertical TENG sensor array, a transverse TENG sensor array and a longitudinal TENG sensor array according to the different load directions measured; the TENG sensor array forms an electrical signal through the coupling friction and electrostatic induction of the power generation sheet under external pressure stimulation; the sensor signal integrated processing single-chip microcomputer is located inside the shell, receives the electrical signal output by the three-way TENG sensor array, and inverts the three-way pressure signal based on the VQX constitutive equation of TENG; the inspection cover is installed at the opening at the bottom of the shell.

[0014] Furthermore, the main structure of the TENG sensor includes a first friction power generation sheet, a spacer layer, and a second friction power generation sheet arranged in sequence from top to bottom; the first friction power generation sheet includes a first electrode layer and a first dielectric material layer arranged from top to bottom; the spacer layer is a square frame that penetrates the inside; the second friction power generation sheet includes a second dielectric material layer away from the spacer layer and a second electrode layer close to the spacer layer; micro-cone arrays are provided on the opposite surfaces of the first dielectric material layer and the second electrode layer, and the micro-cone array on the first dielectric material layer and the micro-cone array on the second electrode layer are arranged alternately.

[0015] Furthermore, after receiving the three-dimensional pressure signal of the TENG self-powered three-dimensional force measuring block, the data acquisition module uses formula 1 to calculate the three-dimensional pedestrian load, and then uses formula 2 to correct the three-dimensional pedestrian load to remove the influence of the inertial force of the TENG self-powered three-dimensional force measuring block itself on the load measurement value;

[0016]

[0017]

[0018] In the formula, the x-axis direction is the lateral direction of the self-powered sensing vibration force measuring platform, that is, the vibration direction; the y-axis direction is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis direction is the vertical direction; the number of the TENG self-powered three-way force measuring block is ij, which means the i-th row and j-th column of the self-powered sensing vibration force measuring platform; m ij is the mass of the force measuring block ij; t is the time; are the pressure values ​​of the TENG sensor on the force measuring block ij in the x, y, and z directions respectively; k x , k y , k z are the numbers of the TENG sensors in the TENG sensor array in the x, y, and z directions respectively; F ijx,d (t), F ijy,d (t), F ijz,d (t) is the pedestrian load in the x, y, and z directions directly measured at the force measuring block ij; a ijx (t) is the lateral vibration acceleration of the self-powered sensing force table where the force measuring block ij is located; F ijx (t), F ijy (t), F ijz (t) are the pedestrian load correction values ​​in the x, y and z directions at the force measuring block ij, respectively.

[0019] Furthermore, the self-powered sensing vibration force measuring platform also includes a safety protection device; the safety protection device includes a guardrail, a parallel overhead rail, a safety rope connected to the parallel overhead rail by a pulley, and a safety belt located at the end of the safety rope.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) Compared with the existing bridge vibration comfort evaluation method used in the design stage of pedestrian bridges, the pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction provided by the present invention can realize real-time interaction between the computer and the self-powered sensing vibration force measurement platform by analyzing the data acquisition module and the feedback control module in the control system, so that the output bridge human-induced vibration response analysis results can fully consider the human-bridge interaction mechanism in which pedestrians adjust their own step frequency, stride length and trajectory after sensing different lateral vibration states of the bridge, resulting in changes in the size and spatiotemporal distribution of walking force, thereby further affecting the bridge vibration response. Finally, a bridge vibration comfort evaluation result that is closer to the actual situation can be obtained, providing an important reference for bridge design.

[0022] (2) At present, the self-powered sensing force platform for measuring walking force usually only measures the unidirectional force distribution perpendicular to the force platform panel or gives the three resultant forces corresponding to the three directions on the self-powered sensing force platform. The self-powered sensing force platform designed in the present invention can obtain the three-dimensional force distribution on the surface of the self-powered sensing force platform through the densely distributed TENG self-powered three-dimensional force measuring blocks. Even under the test conditions of high-density human flow, it can effectively sense the three-dimensional walking force generated by different feet on the same self-powered sensing force platform, and there is no need for the subjects to deliberately adjust their steps to step on different self-powered sensing force platforms, thereby ensuring the naturalness and authenticity of the pedestrian's walking state during load collection.

[0023] (3) The three-dimensional force measuring platforms currently on the market operate using four sensors at the four corners of a rectangular force measuring platform. The failure of any single force sensor will cause the entire force measuring platform to fail. The three-dimensional force measuring blocks on the self-powered sensing force measuring platform of the present invention work independently and can be taken out individually. The damage of a single force measuring block does not affect the overall operation of the self-powered sensing force measuring platform. During maintenance, only the damaged force measuring block needs to be taken out and repaired or replaced. Even if one of the three-dimensional force measuring blocks is damaged, it can be taken out and repaired individually without affecting the overall use function of the self-powered sensing force measuring platform, thereby reducing maintenance costs.

[0024] (4) The TENG sensor used in the TENG self-powered three-axis force measuring block converts mechanical energy into electrical energy by coupling friction charging and electrostatic induction. It also has excellent energy capture effect in low-frequency vibration environment and can directly generate electrical signals without external power supply, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional rendering of a pedestrian bridge vibration comfort evaluation platform taking into account human-bridge interaction provided in an embodiment of the present invention.

[0026] Figure 2A schematic plan view of a pedestrian bridge vibration comfort evaluation platform taking into account human-bridge interaction provided in an embodiment of the present invention.

[0027] Figure 3 A top view of the self-powered sensing force platform.

[0028] Figure 4 Schematic diagram of the base of the self-powered sensing force table.

[0029] Figure 5 Schematic diagram of the TENG self-powered three-way force measuring block of the self-powered sensing force table.

[0030] Figure 6 Schematic diagram of the TENG sensor structure.

[0031] Figure 7 To analyze the working principle flow chart of the control system.

[0032] In the figure, 1. pedestrian, 2. parallel sky rail, 3. safety rope, 4. safety belt, 5. guardrail, 6. self-powered sensing force measuring platform, 7. analysis and control system, 8. servo motor, 9. hydraulic rod, 10. self-powered sensing vibration force measuring platform, 11. TENG self-powered three-way force measuring block, 12. force measuring platform base, 13. fixed grid, 14. force measuring platform data line hole, 15. lubricating coating, 16. TENG sensor, 17. shell, 18. inspection cover, 19. force measuring block data line hole, 20. first dielectric material layer, 21. first electrode layer, 22. protective layer, 23. micro-cone array structure, 24. wire, 25. second dielectric material layer, 26. second electrode layer, 27. spacer layer. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] like Figure 1 As shown, the pedestrian bridge vibration comfort evaluation platform considering the human-bridge interaction of this embodiment includes a self-powered sensing vibration force measurement platform 10 and an analysis and control system 7.

[0035] like Figure 2 As shown, the self-powered sensing vibration force measuring platform 10 includes a plurality of self-powered sensing force platforms 6 containing densely distributed friction nanogenerator (TENG) self-powered three-way force measuring blocks 11. Each self-powered sensing force platform 6 is closely arranged in parallel in the direction of human travel. Each self-powered sensing force platform 6 is independently driven by a different servo motor 8 according to a vibration control signal, and can move in a direction perpendicular to the direction of human travel, so as to obtain the distribution and change of human pedestrian load under different vibration states.

[0036] like Figure 3 and 4 As shown, the self-powered sensing force platform 6 includes a force platform base 12 with a fixed grid 13, and a TENG self-powered three-way force measuring block 11 located in the fixed grid 13 of the force platform base 12. Figure 5 As shown, the TENG self-powered three-way force measuring block 11 includes a shell 17, a TENG sensor array, a sensor signal integrated processing single chip and an inspection cover 18. The shell 17 has an opening at the bottom; the inspection cover 18 is installed at the opening at the bottom of the shell 17; the TENG sensor array is arranged on the side and top surface of the shell 17, and the shell 17 is used to support and arrange the TENG sensor array. The surface of the shell 17 is provided with evenly distributed small holes for the layout of the TENG sensor 16 wires. The TENG sensor array is composed of multiple TENG sensors, which are fixed to the outside of the force measuring block shell 17. According to the different load directions measured, it is divided into a vertical TENG sensor array, a transverse TENG sensor array and a longitudinal TENG sensor array; the TENG sensor array forms an electrical signal through the coupling friction and electrostatic induction of the power generation sheet under external pressure stimulation. The sensor signal integrated processing single chip is fixed inside the shell 17; the bottom of the inspection cover 18 is provided with a force measuring block data line hole 19 for leading out the data line of the sensor signal integrated processing single chip. The size of the fixed grid 13 on the force platform base 12 matches the TENG self-powered three-way force measuring block 11 and ensures that there is no interaction force between the two when they are not stimulated by external loads. The surfaces of the force platform base 12 (including the base grid 13) in contact with the force measuring block 11 are highly smooth and covered with a lubricating coating 15, thereby ensuring that the tangential force on the contact surface with the TENG self-powered three-way force measuring block 11 is extremely small and negligible. The bottom surface of the force platform base 12 is provided with a force platform data line hole 14 aligned with the force block data line hole 19, which is used for the passage of the output data line of the TENG self-powered three-way force measuring block 11. A plurality of steel pulleys are provided under the base 12, and the steel pulleys are placed on parallel tracks on the ground below the self-powered sensing vibration force measuring platform 10. The side of the base 12 is connected to the hydraulic rod 9 of the servo motor 8. Under the drive of the servo motor 8, the base 12 can independently move along the ground track perpendicular to the direction of pedestrian movement as the hydraulic rod 9 extends and retracts, thereby enabling the self-powered sensing vibration force measuring platform 10 to simulate different vibration states of the bridge structure.

[0037] Each TENG self-powered three-way force measuring block 11 on the self-powered sensing force platform 6 operates independently. Damage to a single force measuring block does not affect the force measuring function of other parts on the self-powered sensing force platform 6. During maintenance, only the damaged force measuring block needs to be taken out separately for repair and replacement. The sensor signal integrated processing single-chip microcomputer integrates a data acquisition device, which can collect the output electrical signals of all sensors 16 in the TENG sensor array received by the input interface and convert them into pressure signal output according to the pressure-electrical signal relationship. The pressure-electrical signal relationship is based on the VQX constitutive equation of TENG. Combined with the specific structural form, an analytical expression for the inversion of the current signal pressure signal is derived. The inspection cover 18 at the bottom of the housing 17 of the force measuring block is generally in a blocked state and can be opened when the TENG self-powered three-way force measuring block 11 needs to be inspected and maintained.

[0038] like Figure 6 As shown, the main structure of the TENG sensor 16 includes a first triboelectric sheet, a spacer layer 27, and a second triboelectric sheet arranged from top to bottom. The first triboelectric sheet includes a first electrode layer 21 and a first dielectric material layer 20 arranged from top to bottom; the spacer layer 27 is a square frame that penetrates the inside; the second triboelectric sheet includes a second dielectric material layer 25 away from the spacer layer 27 and a second electrode layer 26 close to the spacer layer 27. Micro-cone arrays are provided on the opposite surfaces of the first dielectric material layer 20 and the second electrode layer 26, and the micro-cone arrays on the first dielectric material layer 20 and the micro-cone arrays on the second electrode layer 26 are arranged alternately. A protective layer 22 is arranged on the outer surface of the first triboelectric sheet, and each layer of material fully covers each other. In this embodiment, the outer contour size of each layer is 20mm×20mm, the electrode layer (thickness 0.2μm) is made of aluminum, the dielectric material layer (thickness 150μm) is made of polytetrafluoroethylene with a micro-cone array structure 23 (50μm×50μm×40μm, interval 50μm), the protective layer 22 (thickness 50μm) is made of styrene-butadiene rubber, and the spacer layer 27 (thickness 50μm) has an inner contour size of 16mm×16mm and is made of elastic material. Figure 6 In order to magnify the main features and structural form of the TENG sensor 16, only part of the microcone array structure 23 is drawn and the proportion of some dimensions is adjusted for ease of understanding and viewing. Since the friction power generation sheets are all made of flexible materials, the contact and separation of the two friction power generation sheets will occur under external pressure stimulation, and the movement of charges is formed by coupling friction charging and electrostatic induction. The resulting electrical signal is transmitted to the sensor signal integrated processing microcontroller via a wire. The microcone array structure 23 on the friction power generation sheet and the spacing layer 27 with a suitable thickness between the two friction power generation sheets can make the contact and separation between the two friction power generation sheets more efficient, thereby making the TENG sensor 16 have higher sensitivity and stability.

[0039] In order to prevent pedestrians from having a significant change in gait when they are on and off the self-powered sensing vibration force measuring platform 10, the floor of the test site can be directly raised to be flush with the upper surface of the self-powered sensing vibration force measuring platform 10. When site conditions do not allow, a gentler slope can be added to the ground at both ends of the self-powered sensing vibration force measuring platform 10 to achieve a smooth connection between the ground and the vibration segment, so that pedestrians can stabilize their steps in advance. In order to fully ensure the safety of volunteers and prevent falls, the self-powered sensing vibration force measuring platform is also equipped with safety protection equipment, including guardrails 5, parallel sky rails 2, safety ropes 3 connected to the parallel sky rails 2 by pulleys, and safety belts 4 at the end of the safety ropes 3.

[0040] like Figure 7 As shown, the analysis and control system 7 in the pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction in this embodiment includes a data acquisition module, a feedback control module and a data output module. The data acquisition module collects the vibration signals of each self-powered sensing force platform 6 and the three-dimensional pressure signal output by the TENG self-powered three-dimensional force measuring block 11 in real time through a data collector, converts the three-dimensional pressure signal into a three-dimensional pedestrian load and corrects it, and then associates the position number of the TENG self-powered three-dimensional force measuring block 11 with the three-dimensional pedestrian load value to obtain the three-dimensional pedestrian load distribution on the self-powered sensing vibration force measuring platform 10. As shown in FIG. Figure 1As shown, the horizontal direction of the self-powered sensing vibration force measuring platform 10 (the vibration direction of the self-powered sensing vibration force measuring platform 10) is the x-axis direction, the longitudinal direction is the y-axis direction, and the vertical direction is the z-axis direction. After the data acquisition module receives the three-dimensional pressure signal of the TENG self-powered three-dimensional force measuring block 11, Formula 1 is used to calculate the three-dimensional pedestrian load. Under the condition of proper processing and installation, the vibration of the force measuring block relative to the self-powered sensing force measuring platform 6 can be ignored, so Formula 2 is used to correct the three-dimensional pedestrian load to remove the influence of the inertial force of the TENG self-powered three-dimensional force measuring block 11 on the load measurement value, and finally the three-dimensional pedestrian load distribution F(t) on the self-powered sensing vibration force measuring platform 10 is obtained. The feedback control module applies the three-dimensional pedestrian load distribution F(t) collected by the self-powered sensing vibration force measuring platform 10 in the vibration state of the current time step k to the corresponding position of the bridge surface of the bridge finite element model to calculate the acceleration, velocity and displacement of the bridge dynamic response, and outputs the corresponding vibration control signal, updates the vibration state of the self-powered sensing vibration force measuring platform 10 in the next time step, and simulates the vibration response of the bridge. The data output module is used to output the bridge dynamic response time history and characteristic values, pedestrian load time history and characteristic values, and bridge vibration comfort evaluation results obtained during the test after the test. Among them, the bridge vibration comfort evaluation generally uses characteristic values ​​such as bridge vibration acceleration peak value and weighted root mean square value as evaluation indicators. The analysis control system 7 realizes real-time interaction between the computer end and the self-powered sensing vibration force measuring platform 10 through the data acquisition module and the feedback control module, so that the output bridge human-induced vibration response analysis results can fully consider the interaction mechanism between pedestrians and bridge lateral vibration, thereby obtaining a comfort evaluation result that is closer to the actual situation.

[0041]

[0042] F ij,d (t)=[F ijx,d (t),F ijy,d (t),F ijz,d (t)] T (3)

[0043] F ij (t)=[F ijx (t),F ijy (t),F ijz (t)] T (4)

[0044]

[0045] In the formula, the x-axis direction is the lateral direction (vibration direction) of the self-powered sensing vibration force measuring platform; the y-axis direction is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis direction is the vertical direction; the number of the TENG self-powered three-way force measuring block is ij, which means it is in the i-th row and j-th column of the self-powered sensing vibration force measuring platform; m ij is the mass of the force measuring block ij; t is the time; are the pressure values ​​of the TENG sensor on the force measuring block ij in the x, y, and z directions respectively; k x , k y , k z are the numbers of the TENG sensors in the TENG sensor array in the x, y, and z directions respectively; F ijx,d (t), F ijy,d (t), F ijz,d (t) is the pedestrian load in the x, y, and z directions directly measured at the force measuring block ij; a ijx (t) is the lateral vibration acceleration of the self-powered sensing force table where the force measuring block ij is located; F ijx (t), F ijy (t), F ijz (t) are the pedestrian load correction values ​​in the x, y, and z directions at the force measuring block ij; F ij (t) is the corrected three-dimensional pedestrian load vector at the force measuring block ij.

[0046] The method for evaluating the vibration comfort of a pedestrian bridge using the pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction includes the following steps:

[0047] S1: Test preparation, including: (1) Importing the finite element model of the bridge into the analysis and control system, carrying out modal analysis, determining the test conditions required for evaluating comfort based on the dynamic characteristics of the bridge, and specifying the analysis step time length Δt (it is also possible to analyze the modal characteristics of the footbridge in other software to determine the test conditions) (2) Assembling the test equipment and calibrating and inspecting the equipment, including leveling and vibration testing of the self-powered sensing vibration force measuring platform 10, inspection of the analysis and control system, and inspection of the safety protection equipment. According to the inspection results, the equipment is adjusted and maintained to ensure normal operation, and the self-powered sensing vibration force measuring platform is restored to its initial static state; (3) Explaining the test requirements (including the number of people passing through, walking or running, random walking or walking along a specified trajectory, etc.) and the test safety instructions to the volunteers, and having them wear a safety belt 4.

[0048] S2: Conducting the experiment, the specific contents include: (1) operating the self-powered sensing vibration force measuring platform 10 and the analysis and control system; (2) the volunteers pass through the self-powered sensing vibration force measuring platform 10 according to the test requirements; (3) after all the volunteers have passed through the self-powered sensing vibration force measuring platform 10, the operation of the analysis and control system and the self-powered sensing vibration force measuring platform 10 is terminated.

[0049] S3: Data processing, including: (1) selecting comfort evaluation indicators in the data output module, generally using bridge vibration acceleration peak value, weighted root mean square value, etc.; (2) exporting the vibration response time history and characteristic values ​​of the real bridge finite element model during the entire test process, the pedestrian load time history and characteristic values, and the bridge vibration comfort evaluation results.

[0050] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction, characterized in that: It includes a self-powered sensing vibration force measurement platform and an analysis and control system; The self-powered sensing vibration force measuring platform comprises a servo control motor and a plurality of self-powered sensing force measuring platforms closely arranged in parallel along the direction of travel of the pedestrian; the self-powered sensing force measuring platform is densely covered with TENG self-powered three-way force measuring blocks, and the TENG self-powered three-way force measuring blocks are located in the fixed grid of the base of the self-powered sensing force measuring platform; the servo control motor controls the self-powered sensing force measuring platform to move perpendicular to the direction of travel of the pedestrian; The analysis and control system includes a data acquisition module, a feedback control module and a data output module; The data acquisition module collects the vibration signals of each of the self-powered sensing force platforms and the three-dimensional pressure signals output by the TENG self-powered three-dimensional force measuring block in real time through a data acquisition device, converts the three-dimensional pressure signals into three-dimensional pedestrian loads and corrects them, and then associates the position numbers of the TENG self-powered three-dimensional force measuring blocks with the three-dimensional pedestrian load values ​​to obtain the three-dimensional pedestrian load distribution on the self-powered sensing vibration force measuring platform; The feedback control module applies the corrected pedestrian load obtained by the data acquisition module at the current time step to the corresponding position of the bridge surface of the bridge finite element model, calculates the dynamic response of the bridge, and outputs a vibration control signal to update the vibration state of the self-powered sensing vibration force measurement platform at the next time step to simulate the vibration response of the bridge; After the test is completed, the data output module outputs the bridge dynamic response time history and characteristic values, pedestrian load time history and characteristic values, and bridge vibration comfort evaluation results obtained during the test.

2. The pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction according to claim 1 is characterized in that: The TENG self-powered three-way force measuring block includes a TENG sensor array, a sensor signal integrated processing single chip, a shell and an inspection cover; the TENG self-powered three-way force measuring block has a unique number according to its position on the self-powered sensing vibration force measuring platform.

3. The pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction according to claim 2 is characterized in that: The TENG sensor array is composed of multiple TENG sensors, which are fixed outside the shell and are divided into a vertical TENG sensor array, a transverse TENG sensor array and a longitudinal TENG sensor array according to the different load directions measured; The TENG sensor array forms an electrical signal through the coupling friction and electrostatic induction of the power generation sheet under external pressure stimulation; the sensor signal integrated processing microcontroller is located inside the shell, receives the electrical signal output by the three-dimensional TENG sensor array, and inverts the three-dimensional pressure signal based on the VQX constitutive equation of TENG; the inspection cover is installed at the opening at the bottom of the shell.

4. The pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction according to claim 3 is characterized in that: The main structure of the TENG sensor includes a first friction power generation sheet, a spacer layer and a second friction power generation sheet arranged in sequence from top to bottom; the first friction power generation sheet includes a first electrode layer and a first dielectric material layer arranged from top to bottom; the spacer layer is a square frame that penetrates the inside; the second friction power generation sheet includes a second dielectric material layer away from the spacer layer and a second electrode layer close to the spacer layer; micro-cone arrays are arranged on the opposite surfaces of the first dielectric material layer and the second electrode layer, and the micro-cone array on the first dielectric material layer and the micro-cone array on the second electrode layer are arranged alternately.

5. The pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction according to claim 1 is characterized in that: After receiving the three-dimensional pressure signal of the TENG self-powered three-dimensional force measuring block, the data acquisition module calculates the three-dimensional pedestrian load using formula 1, and then corrects the three-dimensional pedestrian load using formula 2 to remove the influence of the inertial force of the TENG self-powered three-dimensional force measuring block itself on the load measurement value; In the formula, the x-axis direction is the lateral direction of the self-powered sensing vibration force measuring platform, that is, the vibration direction; the y-axis direction is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis direction is the vertical direction; the number of the TENG self-powered three-way force measuring block is ij, which means the i-th row and j-th column of the self-powered sensing vibration force measuring platform; m ij is the mass of the force measuring block ij; t is the time; are the pressure values ​​of the TENG sensor on the force measuring block ij in the x, y, and z directions respectively; k x , k y , k z are the numbers of the TENG sensors in the TENG sensor array in the x, y, and z directions respectively; F ijx,d (t), F ijy,d (t), F ijz,d (t) is the pedestrian load in the x, y, and z directions directly measured at the force measuring block ij; a ijx (t) is the lateral vibration acceleration of the self-powered sensing force table where the force measuring block ij is located; F ijx (t), F ijy (t), F ijz (t) are the pedestrian load correction values ​​in the x, y and z directions at the force measuring block ij, respectively.

6. The pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction according to claim 1, characterized in that: The self-powered sensing vibration force measuring platform also includes safety protection equipment; the safety protection equipment includes a guardrail, a parallel overhead rail, a safety rope connected to the parallel overhead rail by a pulley, and a safety belt located at the end of the safety rope.

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