Mechanical structure dynamic load identification method based on cubic b-spline scaling function

Abstract

The invention relates to a mechanical structure dynamic load identification method based on a cubic b-spline scaling function. The method comprises the steps of (1) measuring a frequency-response function between a mechanical structure position point bearing a dynamic load and a mechanical structure response measurement point with the hammering method, obtaining a unit impulse response function through rapid Fourier inversion, and then obtaining a transfer matrix through deconvolution; (2) measuring an acceleration signal of the response point generated by the structure dynamic load through an accelerator sensor; (3) establishing scaling function matrixes, dual matrixes and coefficient matrixes of the cubic b-spline scaling function under different layer numbers, and selecting a coefficient matrix with the minimum conditional number; (4) calculating the weight coefficient of the cubic b-spline scaling function under the regularized layer number by means of an acceleration response and coefficient matrix; (5) obtaining a regularized mechanical structure dynamic load to be identified by multiplying the weight coefficient by the corresponding scaling function matrix.

Description

technical field [0001] The invention belongs to the field of load identification of mechanical vibration, and in particular relates to a dynamic load identification method of a mechanical structure based on a cubic B-spline scaling function. Background technique [0002] Dynamic load identification of mechanical structures plays a key role in the fields of structural health monitoring, reliability analysis, fault diagnosis and active vibration control. For example, the fan blades used for wind power generation are inevitably impacted by foreign objects such as wind and sand, flying birds, hail, tools, etc. during the operation and maintenance of the fan, and the frequency of occurrence is relatively high. Integrity and load-carrying capacity cause potential safety hazards; for example, in engineering practice, the atmospheric pulsation pressure acting on the wing of an aircraft or even the impact of foreign objects and birds on the wing or engine blade, the impact contact fo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a mechanical structure dynamic load identification method based on the cubic B-spline scaling function, which is superior to the traditional truncated singular value decomposition method, and is used to solve the ill-conditioned problems existing in the current mechanical structure dynamic load identification

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