Abstract
This study focuses on the effect of damping changes on the vibration isolation of a quasi-zero-stiffness vibration isolator. A nonlinear-vibration equation for the quasi-zero-stiffness vibration isolator is found and solved using the multiscale method. Then, the vibration characteristics before, in the process of and after the damping change, are also examined. The results show that time-varying damping can be equivalent to the addition of a stiffness term to the vibration system, which leads to a change of the vibration amplitude frequency response, leakage of power spectrum, and corresponding linear spectrum features being weakened. When the damping changes rapidly, the vibration system tends to be divergent rather than stable. After the change, the number of stable focuses of the proposed quasi-zero-stiffness vibration isolator increases from one to two, and the system will see decline in its vibration stability.
Highlights
In a floating raft isolation system, the raft frame itself can effectively isolate high-frequency vibration, but plays a limited role in isolating low-frequency vibration
A quasi-zero-stiffness vibration isolator is needed for low-frequency vibration isolation through reducing the inherent frequency of the system. [1, 2]
Kovacica et al investigated the vibration isolation of a quasi-zero-stiffness isolator and analyzed the nonlinear-vibration features that may appear during the vibration process, such as bifurcation and chaos [9]. ere are more examples, than the abovementioned, of those studies on the vibration isolation characteristics of quasi-zero-stiffness isolators, including such study in the context of underload/overload [10], subject to sinusoidal and stochastic excitations [11], and with a quasi-zero-stiffness isolator consisting of compound-shape memory alloys [12]
Summary
In a floating raft isolation system, the raft frame itself can effectively isolate high-frequency vibration, but plays a limited role in isolating low-frequency vibration. From the perspective of application, Valeev et al designed a quasi-zero-stiffness vibration isolator for oil/gas transporters and analyzed the low-frequency vibration isolation performance [3]. Ere has been very little research so far on the effect of damping changes on the vibration isolation performance of the quasi-zero-stiffness vibration isolator. In order to enhance the vibration isolation performance of the isolator against low-frequency vibration as much as possible, both damping and stiffness should be adjustable [17] To this end, magnetorheological (MR) damper is the currently preferred option [18]. To enhance the isolation performance of vibration isolators against low-frequency vibration, this study combines a quasi-zero-stiffness vibration isolator with a magnetorheological damper and analyzes the isolation performance of the quasi-zero-stiffness isolator against low-frequency vibration considering damping as a time-varying parameter
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