Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology

A fatigue crack propagation and vibration system technology, applied in the field of vibration system parameter identification, can solve the problems of poor operability, high cost, poor accuracy, etc., and achieve the effect of accurate quality and stiffness, low experimental cost, and strong operability

Active Publication Date: 2015-07-15
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0003] In order to overcome the deficiencies of poor operability, high cost and poor accuracy of the parameter identification method of the existing resonance fatigue crack growth test vibration system, the present

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  • Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology
  • Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology
  • Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] refer to Figure 1 to Figure 5 , a parameter identification method for a vibration system of a resonant fatigue crack growth test based on soft sensor technology, comprising the following steps:

[0020] 1) Carry out structural analysis on the vibration system, establish a three-degree-of-freedom vibration model of the system, and analyze the force of the mechanical model to obtain the dynamic equation, and derive the relationship between the natural frequency, spring stiffness and mass point of the system from the dynamic equation The system frequency equation of ;

[0021] 2) Calculate the stiffness of the specimen under different crack lengths according to the finite element method, and measure the resonance frequency of the system when the cracks extend to different lengths through the natural frequency measurement experiment method;

[0022] 3) Substituti...

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Abstract

A method for identifying parameters of a resonant fatigue crack propagation test vibration system based on a soft sensing technology comprises the following steps: 1, establishing a system three-degree-of-freedom vibration mechanical model to obtain a kinetic equation, and deriving to obtain a system frequency equation about a relationship among the system inherent frequency, the spring rigidity and the particle mass; 2, calculating according to a finite element technology to obtain the rigidity of a test piece under different crack lengths, and testing the system resonant frequency when a crack is propagated to different lengths; 3, substituting the system resonant frequency value and the corresponding test piece rigidity under different crack lengths into the system frequency equation in order to obtain overdetermined equations about the mass to be identified and unknown rigidity; 4, solving the overdetermined equations through a least squares technique to obtain nonlinear equations about the mass and rigidity; and 5, solving the nonlinear equations by using a Newton-Raphson formula, and identifying the vibration system parameters comprising the mass and the rigidity. The method has the advantages of good maneuverability, low cost and good accuracy.

Description

technical field [0001] The invention relates to the technical field of vibration system parameter identification, in particular to a method for parameter identification of a resonance fatigue crack growth test vibration system based on soft sensor technology. Background technique [0002] The working performance of the electromagnetic resonance high-frequency fatigue testing machine directly affects the accuracy of the test results, that is, during the crack growth process, the natural frequency of the system is strictly tracked and the stability of the test load is controlled. In order to achieve this goal, it is necessary to establish a systematic Dynamic model, and accurate analysis of the dynamic characteristics of the system, it is first necessary to measure and calculate the particle mass and spring stiffness of the vibration system, but the particle of the vibration system is composed of many parts with different shapes and materials. The direct measurement of the par...

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Application Information

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IPC IPC(8): G01N3/62
Inventor 高红俐郑欢斌刘辉刘欢朱亚伦
Owner ZHEJIANG UNIV OF TECH
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