Vehicle and structure information simultaneous identification method based on axle coupling vibration

Abstract

The invention discloses a vehicle and structure information simultaneous identification method based on axle coupling vibration. The method includes acquiring structural environment vibration responsedata and structural sports car vibration response data through sensors arranged on a bridge; respectively identifying a basic modal parameter and a time-varying modal parameter of the structure through a modal algorithm; substituting into a mapping parameter equation of a structural vibration mode scaling coefficient, a modal parameter and a vehicle parameter; calculating vehicle parameters by utilizing the time-varying modal parameters at different moments; further obtaining a structural vibration mode scaling coefficient; reconstructing deep-level parameters of a structure displacement flexibility matrix through the vibration mode scaling coefficient and furthermore, predicting the displacement of structure under any static load, and evaluating current safety state of structure. According to the method, the vehicle parameters and the structure parameters can be recognized only from the structure vibration response, and the method has the advantages of being convenient to test, shortin consumed time and high in precision and is suitable for safety evaluation of many bridges in a road network.

Description

[0001] Field [0002] The invention relates to the field of bridge structure vibration testing in civil engineering structure health monitoring technology, in particular to a method for simultaneously identifying vehicle and structure information based on vehicle-bridge coupling vibration. Background technique [0003] Structural health monitoring technology is one of the most effective ways to improve the health and safety of civil and traffic engineering structures and realize their sustainable performance management. The deflection of bridges is crucial to the evaluation of bridge performance. Therefore, it is particularly important to predict the deformation of the structure under any static load. [0004] Environmental vibration test is one of the main means of health monitoring and detection of existing bridge structures. It uses natural conditions to excite the bridge. Compared with artificial vibration test, it has the advantage of convenient operation, but it can only...

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Problems solved by technology

[0004] Environmental vibration test is one of the main means of health monitoring and detection of existing bridge structures. It uses natural conditions to excite the bridge. Compared with artificial vibration test, it has the advantage of convenient operation, but it can only output the basic Cannot directly support the safety performance assessment of bridge structures

Compared with the environmental vibration test, the shock vibration test needs to artificially apply external excitation, and collect input and output data at the same time. Since the input force is known, the shock vibration test can not only obtain the basic modal parameters such as frequency, damping and mode shape, but also Identify deep-level parameters of the structure such as flexibility, but the impact vibration test needs to close the traffic, which affects the normal operation of the road, and it is difficult to effectively stimulate the entire bridge of the long-span bridge

[0005] A variety of rapid bridge test methods based on vehicle-bridge coupling vibration have been proposed by scholars in the early stage. The widely used method is to identify the bridge mode by installing an accelerometer on the vehicle and collecting acceleration data when the vehicle is driving on the bridge deck. information, but it mainly relies on the indirect measurement of the bridge response, which can only realize the basic modal parameters such as bridge frequency and mode shape and preliminary damage identification, and cannot obtain vehicle parameter information, let alone the structural mode shape scaling factor, which is very important for the safety of bridge structures. Performance evaluation is also limited

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