Directionally Controllable Squeeze Film Damper Using Liquid Crystal

使用液晶的定向可控挤压油膜阻尼器

基本信息

批准号：
07650278
负责人：
MORISHITA Shin
金额：
$ 1.34万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650278/
关键词：
Rotordynamics Squeeze Film Damper Liquid Crystal ER Effect Vibration Control Neural Network スクイーズフィルムダンパ

项目摘要

Liquid crystal (LC) is known as one of highly functional fluids whose apparent viscosity can be varied by an externally applied electric or magnetic field. LC is a homogeneous liquid and its Newtonian viscosity can be varied by the applied electric or magnetic field strength. The attractive characteristics of LC are the wide range of variation of apparent viscosity, the controllability and quick response time, which leads to make various attempts of applying LC to mechanical equipments.A squeeze film damper (SFD) has been widely used as a damping equipment of rotating systems. The damping characteristics of a SFD are generally governed by the viscosity of lubricant and the clearance of the damper. Satio and Kobayashi pointed out the existence of the optimum value of the supporting damping for every whirling mode of a flexible rotor.This research treats a controllable SFD that uses LC as a lubricant which can produce anisotropic damping forces in the horizontal and vertical direction. The whirling orbit of a flexible shaft is, in general, not a circular one but an ellipsoid, therefore, the whirling amplitude of the shaft at each rotating speed can be effectively minimized by controlling the damping forces independently. A pair of electrodes settled in the SFD to control the viscosity of lubricant was divided into a horizontal and vertical direction, and the directional controllability was investigated experimentally. Furthermore, and adaptive control system using an artificial neural network was constructed and its performance was studied.

液晶（LC）被称为高功能性流体之一，其表观粘度可以通过外部施加的电场或磁场来改变。 LC是一种均匀的液体，其牛顿粘度可以通过施加的电场强度或磁场强度来改变。 LC的有吸引力的特征是明显粘度的广泛变化，可控性和快速响应时间，这导致了将LC应用于机械设备的各种尝试。A挤压膜阻尼器（SFD）已被广泛用作阻尼设备旋转系统。 SFD的阻尼特性通常受润滑剂粘度和阻尼器的清除率的控制。 Satio和Kobayashi指出了在柔性转子的每种旋转模式下的支持阻尼的最佳值的存在。这项研究处理可控制的SFD，该SFD使用LC作为润滑剂，该润滑剂可以在水平和垂直方向上产生各向异性阻尼力。通常，柔性轴的旋转轨道不是圆形的轨道，而是椭圆形的圆形轨道，因此，可以通过独立控制阻尼力来有效地最小化轴的旋转振幅。将一对定位在SFD中的电极以控制润滑剂的粘度分为水平和垂直方向，并通过实验研究了方向可控性。此外，还构建了使用人工神经网络的自适应控制系统，并研究了其性能。