Buffer Action of Fluid Films

液膜的缓冲作用

基本信息

批准号：
02650129
负责人：
YAMAGUCHI Atsushi
金额：
$ 1.28万
依托单位：
Faculty of Engineering, Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650129/
关键词：
Buffer action Fluid-films Elastic deformation Reduction of vibration Coefficient of rebound Theoretical analysis Experiment

项目摘要

Hydraulic equipment is widely used for automation and high-performance operation of high-power machines and equipment. However, it is demanded to reduce the vibration and noise. The purpose of this study is to clarify the buffer action of fluid films and elastic deformation.In the first circular (1990), we carried out theoretical analysis. The theoretical model is the case that a cylinder impacts the surface of a cantilever through fluid films. We consider the changes of viscosity an compressibility of the fluid and the elastic deformation and deflection of the cantilever, independently. In this study, the efficiency of the buffer action is mainly evaluated by the changes of the coefficient of rebound. For the case where the impacting velocity is relatively small and the film thickness is comparatively large, the coefficient of rebound became small. Considering the deflection of the cantilever, the efficiency of the buffer action of films becomes to be clear with thin films.In the fina … More l circular (1991), we examined the buffer action experimentally. A cylinder (8.5 g, radius = 4.5 mm) and a sphere (8.35 g, radius = 6.35 mm) impacted the surface of the cantilever (Steel, length = 180 mm, width = 36 mm, thichness = 16 mm) and the infinite elastic body through the fluid film. By estimating the buffer action with the coefficient of rebound, the area-contacting is able to obtain larger buffer action than the point-contacting. It is clarified that the larger the fluid film thickness, the larger the buffer action, and as a whole the buffer action becomes larger by the cantilever. Furthermore, we compared with the theoretical (in the last circular) and experimental results for the case of the cylinders. They have good agreements for the coefficient of rebound qualitatively but do not quantitatively. For the case of the deflection of the cantilever, they have good agreements.In conclusion, it is possible to absorb the impacts by use of the fluid films and the elastic deformation, and estimate the effects by the theoretical analysis. Less

液压设备广泛用于高功率机和设备的自动化和高性能操作。但是，要求减少振动和噪音。这项研究的目的是阐明流体膜和弹性变形的缓冲作用。在第一个圆形（1990年）中，我们进行了理论分析。理论模型是气缸通过流体膜影响悬臂的表面。我们将粘度的变化视为流体的可压缩性以及悬臂的弹性变形和挠度。在这项研究中，缓冲区作用的效率主要通过反弹的核心变化评估。对于撞击速度相对较小并且膜厚度相对较大的情况，反弹的核心变得很小。考虑到悬臂的偏转，薄膜的薄膜缓冲作用的效率变得清晰。圆柱体（8.5 g，半径= 4.5 mm）和一个球（8.35 g，半径= 6.35 mm）影响了悬臂的表面（钢，长度= 180 mm，宽度= 36 mm，Thichness = 16 mm）和通过流体膜的无限弹性体。通过用反弹的核心估算缓冲区的作用，面积接触能够获得比点接触更大的缓冲作用。可以澄清的是，流体膜厚度越大，缓冲作用的越大，并且整个悬臂的缓冲区动作变得更大。此外，我们与圆柱体的理论（最后一个圆形）和实验结果进行了比较。他们对反弹的核心有良好的协议，但没有定量。对于悬臂偏转的情况，它们具有良好的协议。总之，可以通过使用流体膜和弹性变形来吸收影响，并通过理论分析估算效果。较少的