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

液压设备广泛用于大功率机器和设备的自动化和高性能运行，但需要降低振动和噪声，本研究的目的是阐明流体膜和弹性变形的缓冲作用。在第一个循环（1990）中，我们进行了理论分析，理论模型是圆柱体通过流体膜撞击悬臂梁表面的情况，我们考虑了流体的粘度变化、压缩性以及弹性变形和偏转。在本研究中，缓冲作用的效率主要通过回弹系数的变化来评价，对于冲击速度较小且膜厚较大的情况，回弹系数。考虑到悬臂梁的偏转，薄膜的缓冲作用的效率变得很明显。在fina … More l圆形（1991）中，我们通过实验检查了圆柱体（8.5 g，半径= 4.5 mm）和球体（8.35 g，半径 = 6.35 mm）通过液膜撞击悬臂梁（钢，长度 = 180 mm，宽度 = 36 mm，厚度 = 16 mm）和无限弹性体的表面。用回弹系数来估计缓冲作用，面接触比点接触能够获得更大的缓冲作用。液膜厚度越大，缓冲作用越大，并且整体上，悬臂的缓冲作用变得更大。此外，我们与圆柱体情况下的理论（在上一循环中）和实验结果进行了比较。对于回弹系数的定性分析，但对于悬臂梁挠度的情况，两者具有很好的一致性。总之，可以利用流体膜和弹性变形来吸收影响，并估计。理论分析的影响较小。