Purpose

The mechanical molecular spring isolator (MMSI) presents the characteristics of high-static-low-dynamic-stiffness to isolate the low-frequency vibration of a heavy payload.

Methods

An MMSI consists of a piston-cylinder container full of the liquid and some hydraulic spring accumulators. This paper focuses on a particular type of the MMSI that all hydraulic spring accumulators applying the conventional coil spring are identical.

Results and conclusion

In the beginning, the MMSI stiffness model is modelled and the influences of critical parameters on the stiffness property are studied. The MMSI presents a piecewise linear stiffness property. The averaging method is applied to determine the primary resonance response, and the energy transmissibility is adopted to estimate the vibration isolation performance. A jump phenomenon is inevitable to be occurred around the resonance region. The jump avoidance is a critical design part of the MMSI isolation system. On the other hand, based on the stiffness model, it reveals that any stiffness of the coil spring or any size of the accumulator in the MMSI will be able to achieve the same desired stiffness property. The most significant difference between all solutions depends on the coil spring lateral stability. The coil spring lateral stability magnitude is defined as the ratio of the deflection to the buckling deflection to evaluate the quality of each solution. Then, the fundamental design criterion on the MMSI based on jump avoidance and the coil spring lateral stability is established.

中文翻译：

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一种机械分子弹簧隔离器的设计

目的

机械分子弹簧隔离器（MMSI）具有高静态，低动态刚度的特性，可隔离重负载的低频振动。

方法

MMSI由装满液体的活塞缸容器和一些液压弹簧蓄能器组成。本文着重于一种特殊类型的MMSI，即所有应用常规螺旋弹簧的液压弹簧蓄能器都是相同的。

结果与结论

首先，对MMSI刚度模型进行建模，并研究关键参数对刚度特性的影响。MMSI呈现分段线性刚度属性。应用平均法确定一次共振响应，采用能量传递率估计隔振性能。在共振区域周围不可避免地会发生跳跃现象。避免跳跃是MMSI隔离系统的关键设计部分。另一方面，基于刚度模型，它表明螺旋弹簧的任何刚度或MMSI中的任何尺寸的蓄能器都将能够实现相同的所需刚度特性。所有解决方案之间最显着的差异取决于螺旋弹簧的侧向稳定性。螺旋弹簧横向稳定性的大小定义为挠度与屈曲挠度之比，以评估每种解决方案的质量。然后，建立了基于跳跃避免和螺旋弹簧横向稳定性的MMSI基本设计准则。