Random decrement technology-based structure dynamic characteristic identification method

A technology of random reduction and dynamic characteristics, which is applied in the testing of machines/structural components, measuring devices, vibration testing, etc., can solve problems such as being easily polluted by noise, reduce the impact of noise, and reduce the effect of eliminating false modes

Active Publication Date: 2017-09-08
ZHEJIANG UNIV
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Problems solved by technology

In general, it is advantageous to use a large number of trigger points, but trigger p

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  • Random decrement technology-based structure dynamic characteristic identification method
  • Random decrement technology-based structure dynamic characteristic identification method
  • Random decrement technology-based structure dynamic characteristic identification method

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Embodiment Construction

[0073] The following combination figure 1 The case shown in and figure 2 The workflow shown in further illustrates the invention.

[0074] see figure 1 and figure 2 The case cited in the present invention is to use a structural dynamic characteristic identification method based on random decrement technology to carry out modal identification on the two-story frame model, so as to complete the identification of its dynamic characteristics. The specific implementation steps are as follows:

[0075] A. Physical model experiment;

[0076] A1. Prepare the two-layer framework model (1), system installation and debugging;

[0077] A2. Select and arrange 6 measuring points (2) on the second-floor frame according to its structural characteristics;

[0078] A3. Use the vibration table (3) to apply the built-in seismic signal to the model, and output the acceleration response in the Y-axis direction in the computer (4);

[0079] B. Finite element model modeling;

[0080] B1. Est...

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Abstract

The invention discloses a random decrement technology-based structure dynamic characteristic identification method. The method is specifically implemented by the following steps of A, performing a real object model experiment: performing system carrying and debugging, arranging measurement points, and outputting a circumferential acceleration response in a corresponding direction under a certain excitation; B, performing finite element model building according to model parameters of a real object model, and performing acceleration excitation on a finite element model under different time-history conditions to obtain vibration modes and frequencies of different orders; C, performing measurement point arrangement and corresponding output: arranging measurement points according to the structure of the finite element model, and outputting an acceleration response in a required coordinate axis direction under a given sampling frequency; and D, processing response data: under a given triggering condition, extracting a time slice length, processing each measurement point by adopting a random decrement technology and an Ibrahim time domain method, and performing comparative analysis on the obtained data to check the application range and precision of the random decrement technology in dynamic characteristics.

Description

technical field [0001] The present invention relates to a method for identifying dynamic characteristics by using random decrement technology and cooperating with mode identification methods such as Ibrahim time domain method and covariance driven random subspace method. Background technique [0002] Under the action of sudden accidents, earthquakes, wind loads and operational loads, buildings and bridges will generate damage accumulation, which will lead to destructive accidents and bring huge casualties and property losses. Therefore, it is necessary to perform long-term health assessment of buildings and bridges in operation. [0003] The traditional damage testing and assessment of buildings and bridges is mainly based on non-destructive detection and manual inspection. This damage identification method can only be effective when there are visible defects on the structures and components within the human reach. Obviously, for large-scale engineering structures such as l...

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Application Information

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IPC IPC(8): G06F17/50G01M7/02
CPCG01M7/025G06F30/23G06F2119/06
Inventor 陈鹏宇叶肖伟金涛诸琦
Owner ZHEJIANG UNIV
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