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Analysis of Nano-Dynamic Behaviors and Complete and Stable Tracking Conditions for Contact Slider

接触滑块纳米动力学行为及完整稳定跟踪条件分析

基本信息

批准号：
08455079
负责人：
ONO Kyosuke
金额：
$ 4.86万
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 (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455079/
关键词：
Magnetic Recording Contact Slider Bouncing Vibration Friction-Induced Self-Excited Vibration Tracking Characteristics Contact Stiffness Air Bearing Stiffness Dynamic Contact Force ランダム表面

项目摘要

I analyzed bouncing vibrations and dynamic contact force of a 1-DOF contact slider and a 2-DOF tripad contact slider which has two air bearing pads and one contact pad at the trailing edge, and then showed the validity of the results obtained from these numerical analysis by an experimental study. I also investigated friction-induced self-excited vibration phenomena of contact slider supported by a cantilever beam and clarified stable tracking conditions. The results from these studies are summarized as follows :(a) 1-DOF slider model analysisIn order to decrease the bouncing vibration of 1-DOF contact slider and make it track on disk surface completely, low contact stiffness in the order of 10^5N/m, high contact damping of about 0.1, small slider mass and small static load are necessary.(b) Basic experimentThe bouncing vibration are always low when the slider load is high. In the lead contact sliders, the bouncing vibrations are smaller for smaller mass. However, in the case of some glass sliders, a large mass can reduce the bouncing vibrations because of the increase in the inertia effect. Almost all experimental results qualitatively agree with the theoretical ones.(c) 2-DOF slider model analysisLow contact stiffness and high contact damping are important in reducing bouncing vibrations and that the effects of a lower-mode can be avoided. The slider will be analyzed as a single-DOF model by making the rear to front air boaring stiffness ratio high.(d) Friction-induced self-excited vibration analysisThe slider became unstable when the lateral and the angular frequencies of the beam were close to each other and that the slider could be stabilized it the supporting and the contact points were located at the rear of the slider mass center position.

分析了一自由度接触滑块和两自由度三垫接触滑块的弹跳振动和动态接触力，并通过实验验证了数值分析结果的有效性。研究了悬臂梁支承接触滑块的摩擦自激振动现象，阐明了稳定跟踪的条件。研究结果总结如下：(A)单自由度滑块模型分析为了减小单自由度接触滑块的弹跳振动，使其完全在盘面上运行，需要较低的接触刚度为10^5N/m量级，较高的接触阻尼约为0.1，滑块质量和静载荷较小。(B)基础实验当滑块载荷较大时，弹跳振动总是较小的。在铅接触滑块中，质量越小，反弹振动越小。然而，在一些玻璃滑块的情况下，由于惯性效应的增加，较大的质量可以减少反弹振动。(C)二自由度滑块模型分析低接触刚度和高接触阻尼量是减小弹跳振动的重要因素，可以避免低阶振型的影响。(D)摩擦自激振动分析当梁的横向频率和角频率接近时，滑块变得不稳定，滑块可以稳定，支撑点和接触点位于滑块质心位置的后部。