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首页> 外文期刊>International journal of non-linear mechanics >Dynamics and nonlinear effects of a compact near-zero frequency vibration isolator with HSLD stiffness and fluid damping enhancement
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Dynamics and nonlinear effects of a compact near-zero frequency vibration isolator with HSLD stiffness and fluid damping enhancement

机译：紧凑型近零频隔振器与HSLD刚度和流体阻尼增强的动力学和非线性效应

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摘要

Aiming to isolate disturbance vibration for heavy payloads with low frequency, a novel hydro-pneumatic near-zero frequency vibration isolator is proposed, which possesses high-static and low-dynamic (HSLD) stiffness. And different from most isolators existing previously, a nonlinear damping strategy realized by fluid damping mechanism is implemented into the device in order to enhance vibration isolation performance. Due to that the natural frequency of isolation system is close to zero and loading capacity can be adjusted by the gas pressure, the proposed device is termed as pneumatic near-zero frequency (NZF) vibration isolator. To obtain the primary resonance response for the harmonically forced nonlinear system, the averaging method is employed first and verified numerically. A direct current (d. c.) term is added in the analytical trial solution, which reflects the asymmetry existed in dynamic response. As a result, multiple steady solutions are observed and the induced amplitude jump appears. Then the stability of periodic response is carried out by using the Jacobin matrix approach. It is concluded that increases of all types damping including linear, square and friction damping are able to shrink the unstable region and further reduce the possibility of occurrence of amplitude sudden-jump in primary resonance. More accurately, the critical border which can separate the jump and none jump zones is found analytically and numerically, and design criterion for avoidance of sudden-jump is developed. After that, equivalent damping analysis gives a new insight into how nonlinearity effects of each damping dominate vibration isolation transmissibility in resonance and effective isolation frequency band. It is shown that the square type damping based on fluid mechanism can suppress the resonance response and transmissibility and does not decrease the effectiveness in isolation band, which will bring the favorable advantage for NZF isolator in practical application.
机译：旨在隔离具有低频有效载荷的扰动振动，提出了一种新型水力气动接近零频率振动隔离器，具有高静态和低动态（HSLD）刚度。并且与先前现有的大多数隔离器不同，通过流体阻尼机构实现的非线性阻尼策略被实施到装置中，以提高振动隔离性能。由于隔离系统的固有频率接近零和装载能力，可以通过气体压力调节，所提出的装置称为气动接近零频率（NZF）隔振器。为了获得谐波强制非线性系统的初级谐振响应，首先使用平均方法并在数值上验证。在分析试验溶液中加入直流（D.C。）术语，其反映动态响应中存在的不对称性。结果，观察到多种稳定解决方案，出现感应幅度跳跃。然后通过使用Jacobin矩阵方法来执行周期性响应的稳定性。得出结论：包括线性，方形和摩擦阻尼的所有类型阻尼的增加能够缩小不稳定区域，并进一步减少初级共振突然跳跃的发生的可能性。更准确地说，可以分析和数值分开跳跃和无跳跃区域的临界边界，开发了避免突然跳跃的设计标准。之后，等效的阻尼分析介绍了对共振和有效隔离频带中的每个阻尼主导振动隔离变速质的非线性效应如何实现新的洞察。结果表明，基于流体机构的方形阻尼可以抑制谐振响应和传递率，并且不会降低隔离带中的有效性，这将为实际应用中的NZF隔离器带来有利的优势。

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