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An Accurate Discrimination Method for False Modes of Engineering Structures

A discrimination method and engineering structure technology, applied in the direction of instrumentation, geometric CAD, calculation, etc., can solve problems such as environmental interference and false mode difficult to distinguish, and achieve the effect of accurately distinguishing false mode

Inactive Publication Date: 2019-10-11
DALIAN UNIV OF TECH +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for accurate identification of false modes of engineering structures to solve the problem that the false modes are difficult to distinguish due to environmental interference

Method used

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  • An Accurate Discrimination Method for False Modes of Engineering Structures
  • An Accurate Discrimination Method for False Modes of Engineering Structures
  • An Accurate Discrimination Method for False Modes of Engineering Structures

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specific Embodiment approach

[0027] Take an 8-story building structure frame, the mass of the first layer is 1.126×10 6 kg, the mass of the 2nd to 8th layers is 1.100×10 6 kg, the stiffness of the first to fifth floors is 862.07×10 6 N / m, the stiffness of the 6th to 8th floors is 554.17×10 6 N / m, the damping adopts Rayleigh damping, the Rayleigh damping coefficient is determined by the damping ratio of the first two orders of 5%, the excitation form is pulse excitation, the noise level is 20% of the actual signal variance, and the measured signal is each of the 8-layer structure Layer displacement. The specific implementation is as follows:

[0028] (1) Let I=100, J=100; and let k=1, select the measured signal y from the 1st moment to the 199th moment, and the measured signal y from the 2nd moment to the 200th moment (that is, two groups have a time error dynamic measured pulse data) to form Hankel matrices H(k-1) and H(k), in the following form:

[0029]

[0030] In the formula: the vector y is t...

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Abstract

The invention belongs to the technical field of engineering structure monitoring data analysis, mainly relates to a method of identifying false mode of an engineering structure and particularly provides a structure false mode identifying method based on different data selection characteristic system realization algorithms. Truncation order nt is judged preliminarily, data selection is changed according to the truncation order nt, a data movement stability diagram is drawn, and a structure false mode is identified accurately from the data movement stability diagram. The influence of an environment upon frequency is observed by changing data selection, the influence of the environment upon a true mode may be reflected directly, and the false mode may be identified accurately.

Description

technical field [0001] The invention belongs to the technical field of engineering structure monitoring data analysis and relates to a method for discriminating false modes of engineering structures. Background technique [0002] Engineering structures such as bridges will be subjected to various loads during long-term service, such as vehicle loads, wind loads, rain and snow loads, temperature changes, etc. In order to evaluate the service status of the structure, it is necessary to accurately identify the modal parameters of the structure very necessary. A large number of scholars have conducted research on the modal parameter identification methods of engineering structures, such as random subspace method, frequency picking method, random decrement method, and characteristic system realization algorithm. The characteristic system realization algorithm is one of the most popular modal parameter identification methods, which can analyze the modal only by measuring the data...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 曲春绪伊廷华李宏男马树伟
Owner DALIAN UNIV OF TECH
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