Purpose

Bellows-type fluid viscous damper can be used to isolate micro vibration in high-precision satellites. The conventional model cannot describe hydraulic stiffness in the medium- and high-frequency domain of this damper. A simplified analytical model needs to be established to analyze hydraulic stiffness of the damping element in this damper.

Design/methodology/approach

In this paper, a bellows-type fluid viscous damper is researched, and a simplified model of the damping element in this damper is proposed. Based on this model, the hydraulic stiffness and damping of this damper in the medium- and high-frequency domains are studied, and a comparison is made between the analytical model and a finite element model to verify the analytical model.

Findings

The results show that when silicone oil has low viscosity, a model that considers the influence of the initial segment of the damping orifice is more reasonable. In the low-frequency domain, hydraulic stiffness increases quickly with frequency and remains stable when the frequency increases to a certain value; the stable stiffness can reach 106 N/m, which is much higher than the main stiffness. Excessive dynamic stiffness in the high-frequency domain will cause poor vibration isolation performance. Adding compensation bellows to the end of the original isolator may be an effective solution.

Practical implications

A model of the isolator containing the compensation bellows can be derived based on this analytical model. This research can also be used for dynamic modeling and vibration isolation performance analysis of a vibration isolation platform based on this bellows-type fluid viscous damper.

Originality/value

This paper proposed a simplified model of damping element in bellows-type fluid viscous damper, which can be used to analyze hydraulic stiffness in this damper and it was found that this damper showed stable hydraulic stiffness in the medium- and high-frequency domains.

中文翻译：

---

波纹管式流体粘性阻尼器阻尼元件动力刚度的简化模型研究

目的

波纹管式流体粘性阻尼器可用于隔离高精度卫星中的微振动。常规模型无法描述该阻尼器的中高频范围内的水力刚度。需要建立简化的分析模型来分析该阻尼器中阻尼元件的液压刚度。

设计/方法/方法

本文研究了一种波纹管式流体粘性阻尼器，并提出了该阻尼器中阻尼元件的简化模型。在此模型的基础上，研究了该阻尼器在中高频区域的水力刚度和阻尼，并与解析模型和有限元模型进行了比较，以验证解析模型。

发现

结果表明，当硅油粘度较低时，考虑阻尼孔初始段影响的模型更为合理。在低频域，水力刚度随频率快速增加，当频率增加至一定值时，水力刚度保持稳定。稳定的刚度可以达到106 N / m，远高于主刚度。高频域的动态刚度过大将导致隔振性能不佳。在原始隔离器的末端增加补偿波纹管可能是一种有效的解决方案。

实际影响

可以基于该分析模型导出包含补偿波纹管的隔离器模型。该研究还可用于基于该波纹管式流体粘性阻尼器的隔振平台的动力学建模和隔振性能分析。

创意/价值

本文提出了一种波纹管式流体粘性阻尼器阻尼元件的简化模型，该模型可用于分析该阻尼器的水力刚度，并且发现该阻尼器在中高频范围内显示出稳定的水力刚度。