Frequency domain load identification method based on Tikhonov regularization

Abstract

The invention discloses a frequency domain load identification method based on Tikhonov regularization. The method aims at solving the problems existing in frequency response function acquisition in practical engineering application of a matrix inversion method and the morbidity problems existing in calculation. A frequency response function is acquired through a finite element method, the morbidity of mechanical equipment is evaluated through the number of matrix conditions of the frequency response function, and loads are identified based on different regularization methods when the morbidity is different. A proper mobility condition number threshold value is determined. The method has the advantages that the problem that the frequency response function of the mechanical equipment is difficult to acquire in practical engineering application of the matrix inversion method and the morbidity problems existing in calculation can be solved, the load identification accuracy in a frequency domain is improved, and high engineering application value is achieved.

Description

technical field [0001] The invention belongs to the field of mechanical structure load identification and vibration analysis, in particular to a frequency domain load identification method based on Tikhonov regularization. Background technique [0002] With the development of modern engineering technology, various vibration problems have become more and more concerned issues in the engineering field. The identification of the vibration source, which is what we call the identification of the load, is the key to this problem. People pay more and more attention to the load acting on the mechanical structure, and the research on it is gradually deepened. In actual work, the dynamic load acting on the mechanical structure has a great influence on the structure, and is destructive and unpredictable, such as the aerodynamic load on the aircraft in flight, the wave impact on the ship, etc. Therefore, the determination of dynamic load is of great significance in the analysis and re...

AI Technical Summary

Problems solved by technology

At present, the method and theory of load identification are relatively mature, but there are few identification methods that can be used to guide engineering practice. The main reason is that there are the following application difficulties: The number and position of the optimal measuring points involved in load identification will change to a certain extent, and the calculation process of load identification is prone to pathological phenomena, resulting in unreliable identification results; on the other hand, when faced with some complex structures in practice, the actual test The cost is high and sometimes impossible

Images