Frequency domain load identification method based on Tikhonov regularization

A technology of load identification and frequency domain, applied in the field of frequency domain load identification based on Tikhonov regularization, can solve the problems of easy occurrence of morbid phenomenon, high cost, rare identification methods, etc., to overcome the inconvenience or even disassembly of complex mechanical equipment The effect of the test

Active Publication Date: 2015-04-22
XI AN JIAOTONG UNIV
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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 ...

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  • Frequency domain load identification method based on Tikhonov regularization
  • Frequency domain load identification method based on Tikhonov regularization
  • Frequency domain load identification method based on Tikhonov regularization

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Experimental program
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Embodiment 1

[0073] according to figure 1 The experimental bench that simulates the actual working conditions of mechanical equipment is shown.

[0074] 1. Conduct hammer impact modal tests on the structure, and establish a finite element model of the shell structure. By comparing with the finite element modal analysis results, the boundary conditions of the model were corrected, and the structural proportional damping parameters α and β were calculated from the modal test results and formulas (2) and (3), and a finite element model with damping was obtained.

[0075] 2. Reference figure 1 As shown, acceleration sensors are arranged on the determined response points, and the vibration response signals of each measuring point under the 160Hz sinusoidal excitation force of the vibrator are collected. And use the finite element model with damping to calculate the frequency response function matrix from each measuring point to the position of the exciter.

[0076] 3. According to the obtain...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/14
Inventor 陈雪峰罗新杰张兴武乔百杰
Owner XI AN JIAOTONG UNIV
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