温度和电场对电流变流体短挤压膜阻尼器阻尼和刚度特性的影响

IF 1.5 Q3 ENGINEERING, MECHANICAL
H. Jagadish, L. Ravikumar
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引用次数: 2

摘要

挤压膜阻尼器是一种新型的转子动力装置,用于减轻小振幅,大力振动,并与飞机喷气发动机轴承中的减摩轴承一起使用,以提供外部阻尼,因为这些轴承具有很小的固有阻尼。电流变(ER)流体是一种可控流体,其中流体的流变特性,特别是粘度,可以通过控制外加电场的强度来控制,以符合转子动力系统的要求,这种特性可以用于挤压膜阻尼器,在特定的激励频率下提供可变的刚度和阻尼。本文利用现有文献研究了温度和电场对ER流体(硅藻土在变压器油中的悬浮液)表观粘度和动态(刚度和阻尼特性)的影响。随着粘度的增加,这些特性也随着场的增加而增加。然而,随着温度和剪切应变速率的增加,这些特性降低,因为流体的粘度随温度和剪切应变速率而降低。喷气发动机转子处于高温梯度区,阻尼液易受温度变化的影响,因此温度是一个重要的参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Temperature and Electric Field on the Damping and Stiffness Characteristics of ER Fluid Short Squeeze Film Dampers
Squeeze film dampers are novel rotor dynamic devices used to alleviate small amplitude, large force vibrations and are used in conjunction with antifriction bearings in aircraft jet engine bearings to provide external damping as these possess very little inherent damping. Electrorheological (ER) fluids are controllable fluids in which the rheological properties of the fluid, particularly viscosity, can be controlled in accordance with the requirements of the rotor dynamic system by controlling the intensity of the applied electric field and this property can be utilized in squeeze film dampers, to provide variable stiffness and damping at a particular excitation frequency. The paper investigates the effect of temperature and electric field on the apparent viscosity and dynamic (stiffness and damping characteristics) of ER fluid (suspension of diatomite in transformer oil) using the available literature. These characteristics increase with the field as the viscosity increases with the field. However, these characteristics decrease with increase in temperature and shear strain rate as the viscosity of the fluid decreases with temperature and shear strain rate. The temperature is an important parameter as the aircraft jet engine rotors are located in a zone of high temperature gradients and the damper fluid is susceptible to large variations in temperature.
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来源期刊
Advances in Tribology
Advances in Tribology ENGINEERING, MECHANICAL-
CiteScore
5.00
自引率
0.00%
发文量
1
审稿时长
13 weeks
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