基于剪切增稠液体的变阻尼隔振器动力学特性研究

目的研究一种具有变阻尼特性的剪切增稠液体(STF)隔振器。方法首先采用二氧化硅纳米颗粒和聚乙二醇200为工作介质合成剪切增稠液体,通过试验研究剪切增稠液体的流变特性。之后以剪切增稠液体为工作介质,设计一种活塞液压式减振增稠液体隔振器,建立隔振器的动力学模型,并通过数值仿真研究了该隔振器的减振性能;最后,研究剪切增稠液体隔振器隔振性能影响因素。结果当远离共振频率时,隔振器具有小阻尼特性;在共振区附近,由于剪切增稠效应,隔振器阻尼骤然增加,实现对共振峰的有效抑制。结论剪切增稠液隔振器可有效抑制共振峰,同时不会对高频隔振性能产生不利影响,有效解决了传统隔振器线性阻尼的固有缺点。

Dynamical Properties of Variable-damped Vibration Isolator Based on Shear Thickening Fluid

Objective To research on a variable-damped isolator named shear thickening fluid (STF) vibration isolator. Methods Firstly, STF was prepared by dispersing nano-particles of silica into polyethylene glycol 200 fluid, followed by rheological properties test of shear thickening fluid. After that, an STF isolator was designed with STF as working medium. The vibration isolation system supported by STF isolator was modeled and the numerical simulation was conducted to study the vibration isolation properties of STF. And finally, the effect factors on vibrations isolation performance was researched quantitatively. Results STF isolator had small damping property under high vibration frequency. However, because of the shear thickening effect, it exhibited very strong damping at resonance frequency with the increase of shearing rate. So this special inherent character for STF vibration isolator was very effective for restraining resonance. Conclusion STF vibration isolator can effetely restrain resonance without bringing unfavorable effect at high frequency and effectively resolves the problem of traditional isolators.