A vibration comfort evaluation platform for pedestrian bridges considering human-bridge interaction

Abstract

The present invention discloses a pedestrian bridge vibration comfort assessment platform that takes into account human-bridge interaction. The platform comprises a self-powered sensing vibration force measurement platform and an analysis and control system. The self-powered sensing vibration force measurement platform includes multiple self-powered sensing force platforms and servo-controlled motors. The self-powered sensing force platforms are densely packed with friction nanogenerator self-powered three-dimensional force measurement blocks. The analysis and control system comprises three modules: data acquisition, feedback control, and data output. The modules collect the three-dimensional pedestrian load on the self-powered sensing vibration force measurement platform in real time, calculate the bridge dynamic response based on a finite element model of the pedestrian bridge, and then feedback-control the vibration state of the self-powered sensing vibration force measurement platform to simulate the actual bridge vibration. Finally, the bridge vibration comfort is assessed based on the dynamic response characteristics of the bridge throughout the loading process. The present invention enables real-time interaction between a computer and the self-powered sensing vibration force measurement platform, reducing sensing energy consumption while obtaining pedestrian bridge vibration comfort assessment results that are closer to reality.

Description

Technical Field

[0001] The present invention relates to the field of bridge vibration comfort assessment, and in particular to a pedestrian bridge vibration comfort assessment platform considering human-bridge interaction. Background Art

[0002] In recent years, pedestrian bridges have become increasingly constructed using high-strength, lightweight materials, resulting in bridges that are light, low-damping, and have low natural frequencies. These bridges can often generate uncomfortable human-induced vibrations, necessitating a human-induced vibration response analysis during the design phase and an assessment of vibration comfort based on the response results. Existing human-induced vibration response analysis methods typically directly represent pedestrian loads as simplified models such as the Fourier series moving load model with fixed parameters, the MSD model, or the bipedal model, to calculate bridge vibration responses. However, these simplified pedestrian load models fail to fully account for the impact of human-bridge interactions on bridge vibration responses. This is because pedestrians, upon sensing bridge vibrations, adjust their gait frequency, stride length, and trajectory, resulting in changes in the magnitude and temporal and spatial distribution of walking force, which in turn affects the bridge's vibration response.

[0003] Furthermore, bridge vibration comfort assessments often divide pedestrian loads into three components: vertical, transverse, and longitudinal. Existing force platforms that can directly and simultaneously measure three-dimensional pedestrian loads typically use strain gauge or quartz piezoelectric force sensors mounted at the four corners of the platform to obtain the net force acting on the surface. This fails to capture the distribution of the three-dimensional forces on the surface, and any failure of a single force sensor will cause the entire platform to fail. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a pedestrian bridge vibration comfort assessment platform that takes into account the human-bridge interaction. Through real-time interaction between the computer terminal and the self-powered sensing vibration force measurement platform, while reducing energy consumption, it fully considers the interaction between pedestrian loads and the lateral vibration of the bridge, and realizes an assessment of 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 assessment 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 measurement platform includes a servo-controlled motor and a plurality of self-powered sensing force platforms closely arranged in parallel along the direction of travel of the pedestrian; the self-powered sensing force platform is densely covered with a triboelectric nanogenerator (TENG) self-powered three-dimensional force measuring block, and the TENG self-powered three-dimensional force measuring block is located in a fixed grid of the base of the self-powered sensing force platform; the servo-controlled motor controls the self-powered sensing force 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 self-powered sensing force platform and the three-dimensional pressure signals output by the TENG self-powered three-dimensional force measuring block in real time through a data collector, 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 in the current time step to the corresponding position of the bridge surface of the bridge finite element model, calculates the bridge dynamic response, and outputs a vibration control signal to update the vibration state of the self-powered sensing vibration force measurement platform in the next time step to simulate the bridge vibration response;

[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-axis force measuring block includes a TENG sensor array, a sensor signal integrated processing single-chip microcomputer, a shell and an inspection cover; the TENG self-powered three-axis 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 vertical TENG sensor array, transverse TENG sensor array and 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.

[0014] Furthermore, the main structure of the TENG sensor includes a first triboelectric power generation sheet, a spacer layer, and a second triboelectric power generation sheet arranged in sequence from top to bottom; the first triboelectric 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 passes through the inside; the second triboelectric 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 staggered.

[0015] Furthermore, after receiving the three-dimensional pressure signal from 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 on the load measurement value;

[0016]

[0017]

[0018] Wherein, the x-axis is the horizontal direction of the self-powered sensing vibration force measuring platform, i.e., the vibration direction; the y-axis is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis is the vertical direction; the number of the TENG self-powered three-dimensional force measuring block is ij, which represents 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 x, y, and z directions in the TENG sensor array; 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 load cell where the force 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 end and the self-powered sensing vibration force measurement platform by analyzing the data acquisition module and 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 gait frequency, stride length and trajectory after perceiving 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. Ultimately, 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 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 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 platforms currently on the market operate using four sensors on the four corners of a rectangular force platform. The failure of any single force sensor will cause the entire force platform to fail. The three-dimensional force blocks on the self-powered sensing force platform of the present invention work independently and can be removed individually. The damage of a single force block does not affect the overall operation of the self-powered sensing force platform. During maintenance, only the damaged force block needs to be removed and repaired or replaced. Even if one of the three-dimensional force blocks is damaged, it can be removed and repaired individually without affecting the overall use function of the self-powered sensing force 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, making it energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional rendering of a pedestrian bridge vibration comfort assessment platform that takes 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 considering 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 platform.

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

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

[0031] Figure 7 Flowchart to analyze the working principle of the control system.

[0032] In the figure, 1. Pedestrian, 2. Parallel overhead rail, 3. Safety rope, 4. Safety belt, 5. Guardrail, 6. Self-powered sensing force 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-axis 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. Housing, 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 with reference to the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figure 1 As shown, the pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction in 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 multiple self-powered sensing force platforms 6 containing densely distributed friction nanogenerator (TENG) self-powered three-directional 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 the vibration control signal, and can move perpendicular to the direction of human travel, so as to obtain the distribution and change of pedestrian load under different vibration states.

[0036] like Figure 3 and 4 As shown in FIG, the self-powered sensing force platform 6 includes a force platform base 12 with a fixed grid 13, and a TENG self-powered three-dimensional 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-axis force block 11 includes a housing 17, a TENG sensor array, a sensor signal integrated processing microcontroller, and an access cover 18. The housing 17 is open at the bottom; the access cover 18 is mounted at the bottom opening of the housing 17. The TENG sensor array is arranged on the side and top surfaces of the housing 17. The housing 17 is used to support and arrange the TENG sensor array. Evenly distributed small holes are provided on the surface of the housing 17 for routing the wires of the TENG sensors 16. The TENG sensor array is composed of multiple TENG sensors and is fixed to the outside of the force block housing 17. Depending on the direction of the load they measure, they are divided into vertical TENG sensor arrays, transverse TENG sensor arrays, and longitudinal TENG sensor arrays. Under external pressure stimulation, the TENG sensor array generates an electrical signal through friction and electrostatic induction coupled with the generator plate. The sensor signal integrated processing microcontroller is fixed inside the housing 17. The bottom of the access cover 18 has a force block data line hole 19 for leading out the data line of the sensor signal integrated processing microcontroller. The size of the fixed grid 13 on the force platform base 12 matches the TENG self-powered three-dimensional 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-dimensional 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-dimensional 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, it can move independently along the ground track perpendicular to the direction of pedestrian movement as the hydraulic rod 9 extends and contracts, 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-dimensional 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 of 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 sensing signal integrated processing microcontroller integrates a data collector, 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 to the 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-dimensional 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 power generation sheet, a spacer layer 27, and a second triboelectric power generation sheet arranged in sequence from top to bottom. The first triboelectric power generation 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 runs through the interior; the second triboelectric power generation 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 opposing 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 in an alternating manner. A protective layer 22 is arranged on the outer surface of the first triboelectric power generation sheet, and the layers of material fully cover 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 inner contour size of the spacer layer 27 (thickness 50μm) is 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 micro-cone array structure 23 is drawn and the proportions of some dimensions are adjusted for ease of understanding and viewing. Since the triboelectric power generation sheets are all made of flexible materials, the contact and separation of the two triboelectric power generation sheets will occur under external pressure stimulation. The movement of charges is formed by coupling friction charging and electrostatic induction, and the resulting electrical signal is transmitted via a wire to the sensor signal integrated processing microcontroller. The micro-cone array structure 23 on the triboelectric power generation sheet and the spacing layer 27 with appropriate thickness between the two triboelectric power generation sheets can make the contact and separation between the two triboelectric power generation sheets more efficient, thereby making the TENG sensor 16 have higher sensitivity and stability.

[0039] In order to prevent pedestrians from significantly changing their gait when going up and down 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, gentler slopes 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 overhead rails 2, a safety rope 3 connected to the parallel overhead rails 2 by a pulley, and a safety belt 4 at the end of the safety rope 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. 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, the three-dimensional pedestrian load is calculated using formula 1. 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 during the vibration state at the current time step k to the corresponding locations on the bridge surface of the bridge finite element model. It calculates the bridge's dynamic response acceleration, velocity, and displacement, and outputs corresponding vibration control signals to update the vibration state of the self-powered sensing vibration force measuring platform 10 at the next time step, simulating the bridge's vibration response. After the test, the data output module outputs the bridge's dynamic response time history and characteristic values, pedestrian load time history and characteristic values, and bridge vibration comfort assessment results acquired during the test. Bridge vibration comfort assessment generally uses characteristic values ​​such as peak acceleration and weighted root mean square value as evaluation indicators. The analysis and control system 7, through the data acquisition module and feedback control module, enables real-time interaction between the computer and the self-powered sensing vibration force measuring platform 10. This ensures that the output bridge human-induced vibration response analysis fully considers the interaction mechanism between pedestrians and the bridge's lateral vibration, thereby obtaining a comfort assessment result that is more realistic.

[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] Wherein, the x-axis is the horizontal direction (vibration direction) of the self-powered sensing vibration force measuring platform; the y-axis is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis is the vertical direction; the number of the TENG self-powered three-dimensional 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 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 x, y, and z directions in the TENG sensor array; 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 load cell where the force 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 pedestrian bridges using the pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction includes the following steps:

[0047] S1: Test preparation, including the following: (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 pedestrian bridge and determine the test conditions in other software) (2) Assembling the test equipment and performing equipment calibration and inspection, 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: Conduct the experiment, including the following: (1) operate the self-powered sensing vibration force measuring platform 10 and the analysis and control system; (2) volunteers pass through the self-powered sensing vibration force measuring platform 10 according to the test requirements; (3) after all 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, specifically 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) deriving the vibration response time history and characteristic values ​​of the real bridge finite element model during the entire test process, pedestrian load time history and characteristic values, and bridge vibration comfort evaluation results.

[0050] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art will still be able to modify the technical solutions described in the foregoing examples or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.

Claims

1. A pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction, characterized by: Including self-powered sensing vibration force measurement platform, analysis and control system; The self-powered sensing vibration force measurement platform includes a servo-controlled motor and multiple self-powered sensing force platforms closely arranged parallel to the direction of pedestrian movement; the self-powered sensing force platform is densely covered with TENG self-powered three-dimensional force measuring blocks, and the TENG self-powered three-dimensional force measuring blocks are located in the fixed grid of the base of the self-powered sensing force platform; the servo-controlled motor controls the self-powered sensing force platform to move perpendicular to the direction of pedestrian movement; 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 self-powered sensing force platform and the three-dimensional pressure signals output by the TENG self-powered three-dimensional force measuring block in real time through a data collector, 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 in the current time step to the corresponding position of the bridge surface of the bridge finite element model, calculates the bridge dynamic response, and outputs a vibration control signal to update the vibration state of the self-powered sensing vibration force measurement platform in the next time step to simulate the bridge vibration response; 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-axis force measuring block includes a TENG sensor array, a sensor signal integrated processing single-chip microcomputer, a shell and an inspection cover; the TENG self-powered three-axis 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 to the outside of the shell and are divided into vertical TENG sensor array, horizontal TENG sensor array and longitudinal TENG sensor array according to the different load directions measured. The TENG sensor array forms an electrical signal through friction and electrostatic induction coupled with 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 triboelectric power generation sheet, a spacer layer, and a second triboelectric power generation sheet arranged in sequence from top to bottom; the first triboelectric 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 passes through the inside; the second triboelectric 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 in an alternating manner.

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 from 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 on the load measurement value; Wherein, the x-axis is the horizontal direction of the self-powered sensing vibration force measuring platform, i.e., the vibration direction; the y-axis is the longitudinal direction of the self-powered sensing vibration force measuring platform; the z-axis is the vertical direction; the number of the TENG self-powered three-dimensional force measuring block is ij, which represents 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 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 x, y, and z directions in the TENG sensor array; 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 load cell where the force 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 is 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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