An Experimental Identification Method for the Nonlinear Vibration Isolator with Unsymmetrical Dynamic Characteristics

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (6) : 18-23.

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An Experimental Identification Method for the Nonlinear Vibration Isolator with Unsymmetrical Dynamic Characteristics

Zhang C B1, Zhang X X2, Song H W1

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Abstract

When the vibration isolator stays in a biased situation induced by gravity, assembly stress etc., there will be a complex dynamic phenomenon with unsymmetrical characteristic in the concrete as rigid drift. Besides, this kind of drift has intimate relationship both with external exciting frequency and its amplitude. On the other hand, the vibration sensors mainly suit for the measurement of dynamic signals. Therefore, they have some deficiencies like blunt sensitivity and low accuracy in the measurement of constant and slowly varying signals. When these sensors are applied to the experiment of the unsymmetrical systems mentioned above, the rigid drift data will be measured inaccurately or even lost, which can cause great difficulty to the system’s parameter identification. According to this problem, a simple iteration algorithm based on the principle of harmonic balance is constructed for the parameter identification of unsymmetrical dynamic systems so that it is still efficient in the case of the losing of the rigid drift information. After the demonstration of a numerical simulation, this algorithm is successfully applied to the parameter identification of a real vibration isolator. The results show that the identified parameters have satisfying coincidence with the isolator’s experimental dynamic character.

Key words

Nonlinear System / Parameter Identification / Harmonic Balance / Unsymmetrical System / Drift

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Zhang C B;Zhang X X;Song H W. An Experimental Identification Method for the Nonlinear Vibration Isolator with Unsymmetrical Dynamic Characteristics[J]. Journal of Vibration and Shock, 2013, 32(6): 18-23