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Clarification of Contact Dynamic Characteristics and Perfect Contact Sliding Condition of Tri-pad Contact Slider with Air Bearing System

阐明带空气轴承系统的三垫接触滑块的接触动态特性和完美接触滑动条件

基本信息

批准号：
10305015
负责人：
ONO Kyosuke
金额：
$ 21.76万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

1. Contact Dynamics Characteristics and Design Condition of a Slider and Disk Surface (Single-DOF Model)We theoretically derived the perfect contact sliding condition of a single-DOF slider over random wavy disk surface and verified its validity by numerical simulations and experiments. Then, we derived the design conditions of slider and disk surface both for perfect contact sliding and wear durability.2. Design Conditions of Tri-pad Slider (2-DOF Model)We numerically simulated the contact sliding ability of tri-pad sliders, changing design parameters. As a result, it was found that if we make the slider be in perfect contact sliding with disk surface waviness whose standard deviation is 1nm, the contact pressure becomes several MPa. Since the current allowable contact pressure is several kPa for the life time of 5 years, it is almost impossible to satisfy both perfect contact sliding and wear durability condition. Thus, it is the remained subject to expand the calculation range to near contact regime, in which the slider contacts with disk surface intermittently.3. 3-DOF Numerical Simulation of Tri-pad SlidersWe numerically analyzed the effects of roll vibration of the slider on the spacing variation and found that the effect of roll vibration can be neglected even if the ratio of right and left air bearing stiffness is 0.8 (the worst case).4. Experimental Study of Tri-pad SlidersWe manufactured experimental set up which can measure slider dynamic behavior in near contact and contact regimes by reducing ambient pressure to less than 0.1 atmospheric pressure. We observed multiple peak resonance phenomena and decrease of the main resonance frequency from near contact to contact regime.

1.滑块与圆盘表面接触动力学特性及设计条件(单自由度模型)本文从理论上推导了单自由度滑块在任意波纹圆盘表面上的理想接触滑移条件，并通过数值模拟和实验验证了其有效性。在此基础上，推导出了理想接触滑动和耐磨性能的滑块和盘面的设计条件。三垫块滑块的设计条件(二自由度模型)通过改变设计参数，对三块滑块的接触滑动能力进行了数值模拟。结果发现，如果使滑块与标准偏差为1 nm的盘面波纹度完全接触滑动，则接触压力可达数兆帕。由于目前允许的接触压力为几千帕，寿命为5年，因此几乎不可能同时满足完美的接触滑动和耐磨条件。因此，将计算范围扩大到滑块与磁盘表面间歇接触的近接触区域是有待进一步研究的课题。三垫块滑块三自由度数值模拟分析了滑块滚动振动对滑块间距变化的影响，发现即使左右空气轴承刚度之比为0.8(最坏情况)，滚动振动的影响也可以忽略不计。三垫块滑块的实验研究我们研制了一套实验装置，通过将环境压力降低到0.1大气压以下，可以测量近接触和接触状态下的滑块动态行为。我们观察到了多峰共振现象，并观察到从近接触到接触区域的主共振频率降低。