Nonlinear frequency modulation component decomposition-based time-frequency domain modal parameter identification method

A nonlinear frequency modulation, modal parameter technology, applied in complex mathematical operations, electrical digital data processing, special data processing applications, etc., can solve the problems of noise sensitivity, unreliable parameter identification results, poor identification results, etc., to achieve strong application performance and anti-interference ability, improve the modal parameter identification effect, and the effect of simple and convenient use
CN107329932AActive Publication Date: 2017-11-07SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI JIAO TONG UNIV
Publication Date
2017-11-07

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Abstract

The invention discloses a nonlinear frequency modulation component decomposition-based time-frequency domain modal parameter identification method comprising steps of (1) acquiring a dynamic response signal of a to-be-identified structure and setting sampling time and frequency, (2) building a redundancy Fourier model including the response signal, instantaneous frequency and instantaneous amplitude via Fourier series, (3) extracting instantaneous frequency information of the response signal according to generalized parameterization time-frequency transform, (4) extracting instantaneous amplitude information of the response signal according to a regularized least square method according to the acquired instantaneous frequency information, (5) conducting structure modal parameter identification via a linear least square fitting algorithm based on the instantaneous frequency information and slope information of the instantaneous amplitude logarithm and (6) analyzing errors of an identification result. Signal analysis and modal parameter identification are conducted according to a structure vibration response signal, so simple and easy use can be achieved; modal parameter identification precision for high-compact modal structures can be effectively improved; and strong adaptability and interference resistance capacity can be provided.
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Description

technical field

[0001] The invention relates to a time-frequency domain modal parameter identification method based on nonlinear frequency modulation component decomposition, and belongs to the field of structural dynamic modal parameter identification. Background technique

[0002] Modal parameter identification Identifying the modal parameters of the structural system from the measured signals, including modal natural frequency, modal damping ratio, etc., is the basic problem of the linear structural system. The identified modal parameters can be used for model correction in the design phase and damage assessment of structural systems, and many standard design and verification processes in the current industry still mainly rely on linear modal analysis techniques.

[0003] Traditional modal parameter identification methods are mainly divided into two categories: time domain method and frequency domain method, among which the method based on Fourier analysis is the most wid...

Claims

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