Dynamic load recognizing method based on wavelet multiresolution analysis

A wavelet multi-resolution, dynamic load identification technology, applied in the testing of machine/structural components, measuring devices, instruments, etc., can solve the problem that the parameters have no qualitative or quantitative selection basis, have large limitations, and do not use the characteristics of two-dimensional analysis. and other problems, to achieve the effect of excellent recognition ability

Active Publication Date: 2014-07-30
TSINGHUA UNIV
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Problems solved by technology

The load identification method based on wavelet analysis is to identify loads in the time-frequency domain of wavelets. Using the excellent properties of wavelets such as scale characteristics, translation characteristics, compact support, displacement orthogonality, and multi-resolution analysis, it can identify impact loa...

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  • Dynamic load recognizing method based on wavelet multiresolution analysis
  • Dynamic load recognizing method based on wavelet multiresolution analysis
  • Dynamic load recognizing method based on wavelet multiresolution analysis

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Embodiment Construction

[0019] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0020] The idea of ​​the present invention to solve the problem is to complete the dynamic load identification based on the wavelet and its multi-resolution analysis properties: first solve the identification parameters; secondly, calculate the wavelet response function; thirdly, calculate the system response under the wavelet domain and the wavelet response function under the wavelet domain ;Finally, calculate the weight coefficient, reverse the load, and complete the identification.

[0021] figure 1 It is a flowchart of a dynamic load identification method based on wavelet multi-resolution analysis completed by the present invention, and the specific steps of the method are as follows:

[0022] Step 1: Measure the...

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Abstract

The invention belongs to the field of load recognizing, and discloses a dynamic load recognizing method based on the wavelet multiresolution analysis to solve the problems existing in the study on the field of load recognizing at present. The method comprises the first step of solving recognizing parameters; the second step of carrying out wavelet reconstruction on a load through a wavelet basis function based on a time domain convolution model to obtain a wavelet response function; the third step of carrying out wavelet transform on the response and the wavelet response function to obtain a system response in a wavelet domain and a wavelet response function in the wavelet domain; the last step of calculating the weigh coefficient, reversely solving the load and finishing recognition. According to method, non-stable loads such as impact and mutation can be recognized, the recognition precision is high, the method is not sensitive to interference among the multi-path loads comprising quick and slow change in a multi-input and multi-output system, and the multi-path loads can be distinguished and recognized; the ration/qualitative determining method for the recognition parameters is provided, and the dynamic load recognizing method based on the wavelet multiresolution analysis can be used for determining the parameters.

Description

technical field [0001] The invention relates to the field of load identification, in particular to a dynamic load identification method based on wavelet multi-resolution analysis. Background technique [0002] The dynamic load on the engineering structure is an important original parameter for the dynamic design of the structure, vibration reduction and vibration isolation design, strength check, dynamic optimization, etc. However, due to technical or economic constraints, the dynamic load on the structure in many cases Difficult to measure directly. Load identification is generated under such a background, and it can reverse the load through response and other information in many cases where the load cannot be directly measured. [0003] Traditional payload identification methods can be divided into frequency domain identification and time domain identification according to the domain of the signal. Load identification is a very basic problem, and there are still some pro...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 李宗褚福磊秦朝烨阎绍泽
Owner TSINGHUA UNIV
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