Dynamic load recognizing method based on wavelet multiresolution analysis

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...

AI Technical Summary

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 loads However, due to the short development time, the theoretical basis of the method is not perfect, some of the derived expressions are aimed at specific problems, and have large limitations, some parameters have no qualitative or quantitative basis for selection, and some methods do not use the two Dimensional Analysis Features

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