The model of negative vibration isolation system based on the Smart Spring was established. Firstly, it was proposed that the non-smooth system caused by dry friction is piecewise linear, so that the analytical solution of system response could be solved by connected-seam method. And then the possible response pattern of the system was studied. Lastly, using numeric simulation, the motion characteristics varied with the operating frequency which near the slip-starting frequency, for a set of structural parameters, was analyzed. The following conclusions may be drawn from the analysis result. The response curve of the vibration isolation system has a greater distortion in the slip region, and it possesses rich motion features. The results show that the single- period response, multi-period sub-harmonic response, super-harmonic response, qusi-periodic and chaotic response arise in the system. The system tends to maintain sticking motion outside the slipping region, as a result, the primary spring and the active spring are rigidly coupling to a single degree of freedom system. So there are two kinds of motion status in the system, including multi-period and aperiodic response. The vibration isolation system based on the Smart Spring Mechanism(SSM) can be used to suppress the vibration transmission in a adaptive manner by control the piezoelectric actuator voltage in order to vary both the stiffness and damping.
NI De ZHU Ru-Peng BAO He-Yun HU Zheng-Gen.
Study on Response Analysis of Smart Spring Vibration Isolation System under Harmonic Base Excitation Using Piecewise Analytic Method[J]. Journal of Vibration and Shock, 2013, 32(15): 161-167
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