Structural load identification method based on regularization and singular value decomposition

A technology of singular value decomposition and load identification, applied in the field of structural vibration and noise, it can solve problems such as measurement error amplification, and achieve the effect of improving accuracy, good applicability, and improving ill-conditioned inverse problems.

Active Publication Date: 2013-07-10
TONGJI UNIV
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Problems solved by technology

In actual engineering, the frequency response function inversion method is generally used for load identification, but if the system is seriously ill-conditioned during the inversion process, even small measurement errors will be magnified

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  • Structural load identification method based on regularization and singular value decomposition
  • Structural load identification method based on regularization and singular value decomposition
  • Structural load identification method based on regularization and singular value decomposition

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0042] Such as figure 1 As shown, a structural load identification method based on regularization and singular value decomposition, according to the condition number of the frequency response function matrix between the response and excitation, the singular value decomposition method or Tikhonov regularization method is used to To identify the load to be identified, the method specifically includes the following steps:

[0043] 1) The acceleration sensor collects the acceleration response time domain signal of the actual working condition at the response point, and obtains the accele...

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Abstract

The invention relates to a structural load identification method based on regularization and singular value decomposition. The structural load identification method comprises the following steps: (1) an acceleration sensor collecting acceleration response time domain signals of actual working conditions of response points, and obtaining acceleration response frequency domain signals through Fourier transformation; (2) an exciter applying exciting action on various exciting points, the acceleration sensor collecting the acceleration response time domain signals of the response points at the same time, obtaining the acceleration response frequency domain signals and excitation frequency domain signals through the Fourier transformation, and calculating frequency-response functions between the exciting points and the response points; (3) calculating the conditional number of a multi-method matrix of the frequency-response functions; (4) judging whether the conditional number is larger than preset value, identifying identification load through a Tikhonove regularization method if the conditional number is larger than the preset value, and identifying identification load through a singular value decomposition method. Compared with the prior art, the structural load identification method has the advantages of being high in load identification precision, good in application performance, and the like.

Description

technical field [0001] The invention relates to the field of structural vibration and noise, in particular to a structural load identification method based on regularization and singular value decomposition. Background technique [0002] In order to effectively reduce the vibration and noise of mechanical equipment, it is often necessary to predict and analyze the contribution of each excitation and transfer path to the final response. Transfer Path Analysis (TPA) is an effective method. TPA engineering applications mainly involve two structural dynamics problems: load identification and substructure identification. The accuracy of load identification directly affects the noise contribution of different excitations and paths to the final target point, which is the basis for the follow-up work of TPA. [0003] The load identification method refers to identifying the dynamic load acting on the structure according to the known dynamic characteristics of the structure by measur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
Inventor 郭荣房怀庆刘仕伟朱伟伟章桐
Owner TONGJI UNIV
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