29 results about "Rigid model" patented technology

The invention provides a method, a device, equipment and a medium for generating an engineering project management digital model, and the method comprises the steps: collecting original data related to engineering project features, carrying out the preprocessing, forming a standardized project data set, constructing a space-time reference frame based on the data set, fusing a multi-dimensional feature tensor of multiple engineering features, and carrying out the construction of a space-time reference frame. The method comprises the steps of generating a project progress node and an integrated feature tensor, fusing the project progress node and the integrated feature tensor to generate a multi-source association graph containing entity relationships and feature semantics, generating a verified engineering project management digital model according to the project progress node, the integrated feature tensor and the association graph, and dynamically updating and optimizing the model in response to change data in project execution. According to the method, the problems of data dispersion, lack of association and static stiffness of the model in a traditional method are solved, automatic construction and dynamic evolution from multi-source heterogeneous data to an intelligent decision-making model are realized, and the accuracy, real-time performance and intelligent level of project management are remarkably improved.

The invention discloses a 10kV overhead line adaptive evaluation method and system for non-power-cut operation, and the method comprises the following steps: obtaining the field data of a target line, and constructing the field data into a multi-dimensional evaluation feature vector according to a preset evaluation dimension system for non-power-cut operation; inputting the multi-dimensional evaluation feature vector into a non-power-cut operation adaptability evaluation model to obtain a comprehensive evaluation score and an optimization suggestion of the target line; outputting the comprehensive evaluation score and the optimization suggestion; wherein the non-power-cut operation adaptability evaluation model is constructed by the following steps: training to obtain an initial machine learning model; simulating a preset non-power-cut operation task flow in the digital twinborn body; and performing incremental training and parameter optimization on the initial machine learning model by using operation effect data fed back after actual operation of the simulation data vector. The problems of single evaluation dimension, model stiffness and the like in the prior art can be solved.

The invention belongs to the technical field of artificial intelligence and edge computing, particularly relates to an industrial edge-oriented lightweight AI model dynamic loading system, and aims to solve the problems of rigid model deployment, high reasoning delay and update lag caused by resource limitation and variable working conditions of industrial edge equipment. According to the system, an AI model is decoupled into function fragments with attribute tags through a model fragment manager, a configuration strategy is generated by combining a context sensing adaptation module with an equipment state and a task requirement, a scheduling engine determines an optimal fragment combination according to the configuration strategy, an incremental loading executor realizes millisecond-level hot plugging through symbol analysis and a double-buffering mechanism, and the configuration strategy and the scheduling engine are combined. The localized fine tuning unit optimizes key parameters online by using a small amount of data. According to the scheme, loading on demand, dynamic adaptation and non-inductive upgrading are supported, memory occupation and energy consumption are remarkably reduced, the response speed and the model generalization ability are improved, and efficient autonomy of edge intelligent services is achieved.

The invention discloses a full-closed-loop control method for a humanoid robot joint module based on an FPGA (Field Programmable Gate Array), which relates to the technical field of robot control and comprises the following steps of: performing second-order active low-pass filtering and programmable gain amplification on analog signals of an encoder, a gyroscope and a force sensor to convert the analog signals into digital signals; a multi-dimensional feature sequence is constructed, temperature signals of a joint driver and an encoder are collected through a temperature sensor interface, a temperature drift model is constructed, and zero drift compensation parameters are obtained; further obtaining a joint elastic deformation error, and applying the joint elastic deformation error to an encoder signal for online offset correction; outputting a reconfiguration region selection signal based on the lightweight neural network; and triggering bit stream local refresh corresponding to the PR Region according to a region selection signal output by the lightweight neural network. The problem that a control loop is difficult to eliminate flexible errors due to the fact that a traditional rigid model or a constant parameter model is difficult to reflect deformation characteristics under the heat-lubrication-load combined action in real time is solved.

The present application belongs to the technical field of bridge wind tunnel test device, and provides a kind of wind tunnel test device simulating nonlinear vibration of bridge structure, including rigid model, rigid rod, rigid circular arc suspension arm, linear tensile spring, nonlinear elastic element and light high-strength fine rope.Nonlinear elastic element can adopt cable structure, membrane structure, nonlinear tensile spring, mechanical super material or superstructure.By designing the nonlinear stiffness characteristics of nonlinear elastic element, the layout mode and the combination mode of linear tensile spring, various target nonlinear stiffness modes can be realized to carry out large amplitude vertical torsional coupled flutter test of bridge structure under nonlinear stiffness.In the process of large amplitude vibration of model, the center hanging point of nonlinear elastic element and linear tensile spring can always maintain vertical displacement and deformation, and the device can ensure stable stiffness, damping, mass and mass moment characteristics.

The invention belongs to the technical field of bridge wind tunnel test devices, and provides a wind tunnel test device for simulating nonlinear vibration of a bridge structure, which comprises a rigid model, a rigid rod, a rigid arc suspension arm, a linear extension spring, a nonlinear elastic element and a light high-strength string. The nonlinear elastic element can adopt a cable structure, a membrane structure, a nonlinear extension spring, a mechanical metamaterial or a superstructure. Various target nonlinear rigidity modes can be realized by designing the nonlinear rigidity characteristics and the arrangement mode of the nonlinear elastic elements and the combination mode of the nonlinear elastic elements and the linear extension springs, so that a large-amplitude vertical torsion coupling flutter test under the nonlinear rigidity of a bridge structure can be carried out. In the large-amplitude vibration process of the model, the central lifting point of the nonlinear elastic element and the linear extension spring can always keep vertical displacement and deformation, and the device can ensure stable rigidity, damping, mass and mass moment characteristics.

This invention discloses a method for evaluating and comparing comprehensive economic and social development indices, addressing the technical problems of inefficient data processing, rigid models, singular analysis, and static results in existing evaluation methods. The method sequentially completes five layers of operations: constructing and dynamically configuring a three-level evaluation indicator system to generate a configuration file containing comprehensive information; automatically collecting multi-source heterogeneous data and performing cleaning and standardization to generate a standard dataset; calculating and storing sub-domain indices and comprehensive development indices according to a bottom-up hierarchical aggregation logic; conducting longitudinal time-series comparisons, structural differentiation identification, and automated attribution analysis to generate a structured analysis report; and generating a multi-partition interactive visualization interface to achieve a step-by-step exploration of the index from macro to micro levels. This invention automates data processing, dynamically adapts the indicator system, completes in-depth index analysis and interactive display, improves the efficiency and practicality of evaluation, and provides precise decision-making support for the formulation of policies related to economic and social development.

The application discloses a normal fault dislocation and earthquake time sequence coupling simulation test device and method in a supergravity environment, and the method comprises a rigid model box, a fault dislocation system, two normally closed electromagnetic valves, a manual hydraulic pump and a hydraulic oil pipe, wherein the fault dislocation system is arranged in the rigid model box; the two normally closed electromagnetic valves and the manual hydraulic pump are arranged outside the rigid model box; the manual hydraulic pump is connected with the two normally closed electromagnetic valves through the hydraulic oil pipe, and the two normally closed electromagnetic valves are connected with the fault dislocation system through the hydraulic oil pipe. The application realizes high-precision reproduction of the dynamic response of a rock-soil body and the structural disaster process under the time sequence coupling effect of fault dislocation and earthquake vibration by integrating a centrifuge supergravity field, a vibration table earthquake vibration simulation and a fault dislocation system, and provides an advanced test platform for studying the surface deformation law caused by fault dislocation and the coupling disaster mechanism of rock-soil engineering structures such as a roadbed, a slope and a tunnel.

A seabed slope shaking table test system for simulating ocean wave action includes a rigid model box, a wave-generating equipment support, an integrated lifting wave device, and an end wave-damping device. The rigid model box is connected to the shaking table platform at its bottom. The wave-generating equipment support is fixed to the side wall of the rigid model box, supporting the integrated lifting wave device and adjusting its height. The integrated lifting wave device is used for wave simulation and reflected wave elimination. The end wave-damping device is fixed to the side wall of the rigid model box, opposite the integrated lifting wave device, and is used for end wave damping. This invention simulates earthquakes on the shaking table while simultaneously loading waves, unifying the effects of overlying seawater, waves, and earthquakes. This allows for a more realistic simulation of multi-dynamic coupling instability of seabed slopes in complex marine environments. Furthermore, the wave parameters and the water depth of the wave-generating equipment are flexibly adjustable, facilitating a wider range of experimental parameters for seabed slopes.

The application belongs to the technical field of bridge wind tunnel test device, and provides a free vibration test device for simulating nonlinear stiffness of a bridge rigid model, which comprises a rigid model, a rigid rod, a rigid arc-shaped hanging arm, a bearing fixed pulley, a linear tensile spring and a light high-strength thin rope. By flexibly designing the shape and size of the rigid arc-shaped hanging arm, the spatial position of the bearing fixed pulley and the initial strain of the spring and other parameters, the device can realize various vertical and torsional coupling nonlinear stiffness modes, and can also realize only vertical nonlinear stiffness and constant torsional stiffness, so as to carry out large-amplitude vertical torsional coupling flutter and large-amplitude vertical galloping vibration test of the bridge structure under nonlinear stiffness. In the process of large-amplitude vibration of the model, the spring can always keep a vertical state and will not vibrate laterally, so that the test device has stable low damping, mass and stiffness.

The application relates to the technical field of unmanned aerial vehicle control, and discloses a four-unmanned aerial vehicle cooperative hoisting system for emergency rescue and a robust control method thereof; the robust control method solves the problem of low applicability of a rigid model by constructing a coupling model of the four-unmanned aerial vehicle cooperative hoisting system, establishing a dynamic equation based on Lagrange-D'Alembert theorem, accurately describing a high-order coupling relationship between unmanned aerial vehicle displacement and hoisting rope swing angle, designing a swing reduction control model, constructing a Lyapunov candidate function and a coupling error function by using an energy method, integrating position, formation and swing angle errors, regulating and controlling the swing reduction control model, dynamically adjusting parameters such as damping gain, realizing swing suppression, ensuring system asymptotic stability, improving model precision, enhancing control robustness, greatly reducing swing amplitude, and meeting the requirements of rapidness and safety of power emergency rescue.

This invention discloses a method for calculating and evaluating gear knocking on balance shaft scissor teeth, comprising the following steps: constructing a rigid model of an engine balance shaft system; performing mesh generation to obtain a finite element model; setting condensed nodes on the finite element model and coupling the condensed nodes with the contact boundaries; performing condensation processing on the finite element model and using the generated condensed model to replace the finite element model for mechanical analysis; making the gears flexible; applying excitations at various speeds on the crankshaft and starting simulation calculations; extracting the meshing force on the tooth surface of each gear pair at each speed; processing the meshing force data to obtain the peak meshing force, obtaining the impact index based on the peak meshing force, and obtaining the knocking evaluation based on the impact index. The method described in this invention can establish a fully flexible balance shaft system simulation model and quantitatively evaluate the knocking noise of balance shaft scissor teeth, providing a basis for the analysis and optimization of gear knocking problems on balance shaft scissor teeth.

The application discloses a construction safety risk early warning system and method based on three-dimensional grids and dynamic gain, comprising: a grid construction and risk factor management module for constructing three-dimensional grid units of a construction risk area and generating a risk factor set of each grid; a model parameter setting module for determining the benchmark weight of each risk factor, setting a dynamic gain function, sensitivity parameters and hierarchical early warning thresholds for each factor; a model parameter calibration module for iteratively optimizing model parameters through historical data backtesting and random scenario stress testing; a risk dynamic assessment and early warning module for calculating the dynamic weight of risk factors and the real-time risk value of grid units based on the real-time collected state values of risk factors, benchmark weights and optimized parameters, and then triggering hierarchical early warning. The application solves the problems of the existing risk early warning method, such as coarse granularity, difficulty in dynamically responding to risk evolution and rigid model parameters, and realizes real-time, accurate and dynamic early warning of construction safety risks.

The embodiment of the application discloses a kind of ring sweep imaging satellite's rotation control method, device and medium;The method can include: according to the kinematics equation constructed by (w,z) parameter and the dynamics equation constructed by rigid model, the reference value w of parameter w for describing spin axis pointing is obtained by time integration r ;Rotation stage: without introducing the parameter z for describing the rotation angle around spin axis, the parameter w obtained by the first reference value w r Parameter error w e And angular velocity error ω e First control law is designed for rotation control, and is switched to spin angle control stage after rotation stabilizes;Spin angle control stage: the value of parameter z at switching time is used as the initial value of the reference value z r Of parameter z, and according to the kinematics equation constructed by (w,z) parameter and the dynamics equation constructed by rigid model, subsequent reference value z r Is obtained by time integration;According to the reference value z r Of the parameter z, the error z e Of parameter z is introduced, and the second control law for spin angle control is designed according to the error z e Of the parameter z and the first control law.

The invention relates to the technical field of computers, and discloses a virtual model deformation method and device, equipment, a medium and a product, and the method comprises the steps: obtaining a first virtual model, and recognizing a first rigid model in the first virtual model; performing global deformation on the first virtual model to obtain an intermediate virtual model; determining rigid transformation parameters of the first rigid model according to parameter change information corresponding to the intermediate virtual model and the first rigid model from global transformation of the first virtual model; and combining a second rigid model obtained by performing rigid transformation on the first rigid model according to the rigid transformation parameters with the flexible model in the intermediate virtual model to generate a second virtual model. Smooth fitting of flexible models such as cloth can be guaranteed, the structural characteristics of rigid components can be maintained, and the method is suitable for deformation of mixed material models.

The application discloses a human-imitating robot joint module full-closed loop control method based on FPGA, and relates to the technical field of robot control.The steps of the method comprise the following steps: performing second-order active low-pass filtering and programmable gain amplification conversion on the analog signals of an encoder, a gyroscope and a force sensor to obtain digital signals; constructing a multi-dimensional feature sequence, collecting temperature signals of a joint driver and the encoder through a temperature sensor interface, and constructing a temperature drift model to obtain zero-position drift compensation parameters; then, joint elastic deformation error is applied to the encoder signal to perform online offset correction; based on a lightweight neural network, a reconfiguration region selection signal is output; and according to the region selection signal output by the lightweight neural network, a bit stream local refresh of a corresponding PR Region is triggered.The application solves the problem that a traditional rigid model or a constant parameter model is difficult to reflect deformation characteristics under the combined action of heat-lubrication-load in real time, so that a control loop is difficult to eliminate flexible error.

The invention provides a multi-modal fusion investment management evaluation method and device and a processor. The method relates to the technical field of data processing, and comprises the following steps: generating an evaluation model passing verification based on a selected model framework and a configuration code in user configuration information; based on a data request in the user configuration information, calling reference data from a database; based on reference data, in combination with options, through a function correspondingly configured in the evaluation model, performing statistical calculation to obtain evaluation data; and generating a visual result based on the evaluation data and pushing the visual result to the user terminal. Therefore, a complete closed-loop evaluation process from configurable model building to data calling, then to calculation analysis and finally to visual output solves the problems of model solidification, non-visual analysis result and the like of a traditional evaluation method; and finally, the evaluation data is pushed in a visual form, a user does not need to manually arrange the data and make a chart, the basic working cost of investment and research personnel is greatly reduced, and the evaluation efficiency is improved.

The present application relates to a kind of semi-rigid connection steel frame-support structure direct design method, comprising the following steps: according to load determination frame beam, frame column, plate component section size, and calculate internal force design value;Select bolt type, reasonably arrange the structure of beam-column joint area, to determine the flexural capacity of beam-column joint and the rigidity of each component;Establish the overall model of semi-rigid connection steel frame-support structure, according to the architectural function layout and structure stiffness demand, adjust the stiffness of buckling restrained brace, so that the lateral stiffness of semi-rigid model with increased support in two principal axes direction and the error of original rigid model is less than the set threshold value;Define the nonlinear properties of node, nonlinear working condition and combination, and carry out the checking of semi-rigid connection steel frame-support structure in load-carrying capacity limit state and normal use limit state.Compared with prior art, the present application has the advantages of high bearing efficiency, high section utilization rate, and saving steel quantity under the same mechanical performance.

The invention belongs to the technical field of aircraft design, and particularly relates to a static aeroelasticity influence correction method for a full-aircraft model of a high-aspect-ratio aircraft. The method for correcting the static aeroelasticity influence of the full-aircraft model of the high-aspect-ratio aircraft comprises the following steps: manufacturing a rigid model and an elastic model; performing a wind tunnel test; obtaining a static aeroelasticity influence quantity; and carrying out aerodynamic coefficient correction. According to the method for correcting the static aeroelasticity influence of the full aircraft model of the high-aspect-ratio aircraft, the influence of elastic deformation of an aircraft structure is considered, wind tunnel test data is subjected to static aeroelasticity influence correction, the correction precision is higher than that of a static aeroelasticity influence correction method based on engineering calculation or numerical simulation, and the method is not only suitable for framework types, but also suitable for large-aspect-ratio aircraft models. The method is also suitable for a cruise configuration, the corrected test data is used for flight control law design of the aircraft, the requirement for correcting the air and ground data correlation of the aircraft is met, the test period and expenditure are saved, and the method has engineering practical value.

An adaptive reaction system for intelligent responsive microplastic degradation, relating to the field of microplastic pollution control technology, addresses the problem of rigid model cognition in existing machine learning models. It includes a sample input and pretreatment module, a plasma degradation module, a photocatalytic degradation module, an intelligent response control module, and a product output and monitoring module. The sample input and pretreatment module receives microplastic samples and outputs a homogeneous microplastic suspension. The plasma degradation module receives the microplastic suspension and outputs a reaction mixture containing intermediate degradation products. The photocatalytic degradation module receives the reaction mixture and outputs the final product. The intelligent response control module incorporates a metacognitive monitor and a controlled exploration unit. The product output and monitoring module receives the final product and outputs degradation product and efficiency data, feeding the data back to the intelligent response control module. This invention solves the problem of rigid model cognition in existing machine learning models.

The application relates to a fault simulation test device and method satisfying strong earthquake dislocation coupling loading, which comprises a rigid model box, a module assembly type component, a layered shear component, a shaking table loading device and a bracket. The bracket is arranged between the two shaking table loading devices, one end of the module assembly type component is connected with the rigid model box, the other end of the module assembly type component is connected with the layered shear component, and the bottom of the layered shear component is slidably connected with the bracket. The soil body and the tunnel model are arranged in the rigid model box and the module assembly type component and pass through the layered shear component. The rigid model box and the module assembly type component are controlled to move along the vibration direction of the shaking table loading device by inputting the seismic wave of the shaking table loading device, so that the layered shear component is driven to dislocate. Compared with the prior art, the application can effectively simulate the influence of the displacement of the fault fracture zone on the tunnel structure under the strong earthquake dislocation coupling condition, is easy to operate and has high universality.

The invention discloses a method for calculating the safety coefficient of a spider type overhead working truck, which belongs to the field of overhead working trucks and comprises the following steps of: firstly, modeling a three-dimensional rigid model; importing the three-dimensional model into ADAMS software, performing Boolean operation merging on the model, and adding constraints and drives; carrying out flexible processing on each section of boom model of the whole vehicle in ANSYS software to obtain an MNF file and outputting the MNF file; re-importing the MNF file into the ADAMS software to replace an original rigid arm support model; carrying out rigid-flexible coupling multi-dynamics model simulation, and obtaining the real-time change condition of the contact counterforce between the supporting leg and the ground by utilizing a post-processing function; wherein the spider type overhead working truck has four overturning lines AB, BC, CD and DA, an overturning moment Mr and a stabilizing moment Ms are calculated by utilizing a formula, and finally, a safety coefficient K is calculated by combining the overturning moment Mr and the stabilizing moment Ms calculated in the step S7; the dynamic safety coefficient of the spider type overhead working truck is obtained through the change of the supporting reaction force of the supporting legs, and the authenticity of stability evaluation can be improved.

The present invention discloses a method for simulating cross-fault tunnel tests under the combined effects of earthquake motion and fault movement, belonging to the technical field of tunnel engineering model tests. The method comprises the following steps: step one: determining the similarity relationship of the models; step two: making a tunnel lining test model; step three: making a test model box; step four: pouring surrounding rock; step five: pressurizing the model box to simulate the tunnel burial depth; step six: simulating fault movement; and step seven: applying earthquake motion. In the present invention, a horseshoe-shaped flexible model box is designed to replace the rigid model box used in conventional model tests. The test cost is low and can be completed on a set of test systems without the need to design several additional devices. The operation process is simple and the feasibility is strong. Based on the characteristics of tunnels crossing active faults, the influence of ground stress is considered, and the deformation and damage evolution laws of the tunnel under the combined effects of earthquake motion and fault movement are comprehensively analyzed to better reflect the actual site conditions.

The invention provides a user side energy storage hybrid regulation capability cooperative control method, which comprises the following steps: collecting multi-source data, matching a scene label, and associating a scene database based on the scene label; generating a power grid change trend through a power grid edge trend pre-judgment strategy based on the multi-source data, generating an emergency degree parameter, calling the adaptation degree of a corresponding model from a scene database according to a scene label, calculating a priority coefficient through a priority model, obtaining a corresponding response model according to the priority coefficient, and obtaining a response result according to the response model; the response mode comprises a rigid priority mode, a flexible priority mode and a fusion control mode; according to the response mode, a corresponding control model is called to execute energy storage charging and discharging adjustment, the control model comprises a rigid control model adaptive to a scene adaptation degree threshold value and a multi-constraint flexible adjustment model capable of adaptively selecting an algorithm, and smooth transition of the rigid model and the flexible model is achieved by fusing the control mode based on pre-judgment parameters.

The invention relates to a carpet lamp angle positioning method and system, and the method comprises the steps: constructing each rigid model of a vehicle, and building a corresponding constraint point on each rigid model; based on the constraint points on the carpet lamp model and the constraint points on the threshold trim panel model, performing assembly constraint on the carpet lamp model and the threshold trim panel model to obtain a first assembly model; based on the constraint points of the first assembly model and the constraint points of the vehicle body assembly model, performing assembly constraint on the first assembly model and the vehicle body assembly model to obtain a vehicle rigid model; loading the theoretical tolerances corresponding to the constraint points of the rigid models and the constraint points of the first assembly model to the vehicle rigid model to obtain a carpet lamp positioning angle deviation value, and judging whether the carpet lamp positioning angle deviation value meets design requirements or not; and if the deviation value does not meet the design requirement, adjusting the constraint point of the first assembly model and the constraint point of the vehicle body assembly model, and carrying out assembly constraint on the first assembly model and the vehicle body assembly model again until the carpet lamp positioning angle deviation value meets the design requirement.

This invention belongs to the technical field of bridge wind tunnel testing devices, and provides a large-amplitude free vibration testing device for simulating bending-torsional coupled nonlinear stiffness. The device includes a rigid model, a rigid rod, a rigid boom, a bearing pulley, a linear tension spring, and a lightweight, high-strength rope. By adjusting the original length, stiffness, and initial strain of the spring, as well as the spatial positions of the boom's suspension point and the bearing pulley, the target nonlinear stiffness in both vertical and torsional directions can be achieved, facilitating large-amplitude bending-torsional coupled flutter vibration tests under the nonlinear stiffness of bridge structures. During the large-amplitude vibration of the model, the spring remains vertical, avoiding instability and damping caused by local vibrations. This invention's large-amplitude free vibration testing device only adds a bearing pulley and a lightweight, high-strength rope compared to traditional devices, making it simple in design, low in cost, easy to manufacture, and highly efficient.

The present invention belongs to the technical field of aircraft design, and specifically relates to a method for correcting the static aeroelastic influence of a full-machine model of a large aspect ratio aircraft. The method for correcting the static aeroelastic influence of a full-machine model of a large aspect ratio aircraft of the present invention comprises making a rigid model and an elastic model; conducting a wind tunnel test; obtaining the static aeroelastic influence amount; and correcting the aerodynamic coefficient. The method for correcting the static aeroelastic influence of a full-machine model of a large aspect ratio aircraft of the present invention takes into account the influence of the elastic deformation of the aircraft structure, and corrects the static aeroelastic influence of the wind tunnel test data. The correction accuracy is higher than that of the static aeroelastic influence correction method based on engineering calculations or numerical simulations. It is not only applicable to the frame configuration, but also to the cruise configuration. The corrected test data is used for the design of the flight control law of the aircraft, which meets the demand for correction of the correlation between the aircraft's ground and earth data, saves the test cycle and funds, and has engineering practical value.

The invention belongs to the technical field of bridge wind tunnel test devices, and provides a large-amplitude free vibration test device for simulating bending-torsion coupling nonlinear rigidity, which comprises a rigid model, a rigid rod, a rigid suspension arm, a bearing fixed pulley, a linear extension spring and a light high-strength thin rope. By adjusting the original length, the rigidity and the initial strain of the spring and the spatial positions of the suspension point of the rigid suspension arm and the bearing fixed pulley, the vertical and torsional target nonlinear rigidity can be realized, so that a large-amplitude bending-torsional coupling flutter vibration measurement test under the nonlinear rigidity of a bridge structure can be conveniently carried out. In the large-amplitude vibration process of the model, the spring can be kept in a vertical state all the time, and unstable damping and rigidity caused by local vibration of the spring are avoided. Compared with a traditional device, the large-amplitude free vibration testing device is additionally provided with the bearing fixed pulley and the light high-strength thin rope, and is simple in design, low in cost, easy to machine, efficient and feasible.

The invention belongs to the technical field of bridge wind tunnel test devices, and provides a free vibration test device for simulating the nonlinear rigidity of a bridge rigid model, which comprises a rigid model, a rigid rod, a rigid arc-shaped suspension arm, a bearing fixed pulley, a linear extension spring and a light high-strength string. By flexibly designing the shape and size of the rigid arc-shaped suspension arm, the spatial position of a bearing fixed pulley, the initial strain of a spring and other parameters, the device can realize various vertical and torsional coupling nonlinear rigidity modes, and also can realize that the rigidity is nonlinear only in the vertical direction and the torsional rigidity is kept constant; therefore, large-amplitude vertical torsional coupling flutter and large-amplitude vertical galloping vibration measurement tests under the nonlinear rigidity of the bridge structure can be carried out. In the large-amplitude vibration process of the model, the spring can be always kept in a vertical state, and lateral vibration is avoided, so that the test device is ensured to have stable low damping, quality and rigidity.