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Nonlinear rigidity identification method based on pattern search under pulse excitation

A pattern search and pulse excitation technology, applied in character and pattern recognition, complex mathematical operations, instruments, etc.

Pending Publication Date: 2021-08-24
SOUTHEAST UNIV
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  • Claims
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Problems solved by technology

At present, the parameter identification theory of linear systems has become mature, but the general linear model is actually an approximate mathematical description obtained by ignoring some nonlinearities or replacing them with linear relationships.

Method used

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  • Nonlinear rigidity identification method based on pattern search under pulse excitation
  • Nonlinear rigidity identification method based on pattern search under pulse excitation
  • Nonlinear rigidity identification method based on pattern search under pulse excitation

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Embodiment Construction

[0027] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0028] In this embodiment, a nonlinear stiffness identification method based on pattern search under pulse excitation can identify a multi-degree-of-freedom nonlinear vibration system, such as figure 1 As shown, the multi-degree-of-freedom nonlinear vibration system includes a linear structure and a nonlinear structure, and the nonlinear structure includes a linear damping item and a stiffness item connected in parallel; figure 1 Take the two-degree-of-freedom nonlinear vibration system as an example to illustrate, in the figure m 1 Indicates the mass of the linear structure, m 2 Indicates the quality of the nonlinear structure, and the linear coupling between the two is weak, C 1 represents the linear damping term of the linear structure, C 2 Represents the linear damping term of the nonlinear structure, K represents the linear stiffness term of...

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Abstract

The invention relates to a nonlinear rigidity identification method based on mode search under pulse excitation, which comprises the following steps of: applying a pulse signal to a two-degree-of-freedom local nonlinear vibration system, acquiring actual measurement transient response after the pulse signal acts, defining and extracting characteristic displacement, obtaining instantaneous frequency, and obtaining a frequency-displacement diagram; and establishing a kinetic model corresponding to the obtained frequency-displacement diagram, defining a frequency according to the kinetic model, fitting the frequency with the instantaneous frequency, and determining an unknown nonlinear stiffness parameter of the system based on a mode search algorithm. According to the method, data processing is performed on the signal on the basis of obtaining the actually measured transient response, the nonlinear stiffness parameters of the two-degree-of-freedom local nonlinear vibration system are effectively identified by adopting the mode search algorithm, and the method has practical engineering significance.

Description

technical field [0001] The invention relates to a nonlinear system parameter identification method, in particular to a nonlinear stiffness identification method based on pattern search under pulse excitation. Background technique [0002] System parameter identification is to use mathematical methods to extract system model parameters from data sequences. At present, the parameter identification theory of linear systems has become mature, but the general linear model is actually an approximate mathematical description obtained by ignoring some nonlinearities or replacing them with linear relationships. Systems with complex nonlinearities cannot be approximated by linear models, so efficient nonlinear parameter identification methods are needed to describe nonlinear system dynamics. Contents of the invention [0003] The invention provides a method for identifying nonlinear stiffness based on pattern search under pulse excitation, so as to effectively determine the nonline...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06F17/11
CPCG06F17/11G06F2218/06G06F2218/08
Inventor 费庆国谢雷朱锐马晗姜东马蕾张利
Owner SOUTHEAST UNIV
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