Development of a System for Measurement, Analysis and Evaluation of Nano-Dynamics

本研究计画针对磁盘记录用静压空气轴承主轴及浮动滑块轴承之奈米动力学特性进行量测、分析与评估，以改善其性能。本研究的结果如下。(a)比较了三种精密测振仪的分辨率和信噪比，以确定每次测量应使用哪种测振仪。(b)提出了一种分离测振仪测量信号中主轴振动不可重复分量和可重复分量的方法。提出了一种从表面不平整度中分离出主轴重复振动的方法。(c)用该方法对磁盘主轴和静压气浮主轴的回转精度进行了精密测量。(d)理论上可以预测出最低三阶振型、固有频率和阻尼比 ...更多信息 从轴承气膜润滑分析和刚性转子及轴承动力学分析相结合的角度出发，(e)采用有限元法和实验模态分析相结合的方法，研究了推力盘与轴颈螺栓连接对转子振动特性的影响。(f)将基于雷诺方程的气膜润滑分析与主轴转子的有限元结构分析相耦合，可以从理论上估计气浮主轴的振动特性。(g)提出了一种旋转气浮主轴传递函数的测量方法。该方法可以从检测到的响应信号中去除表面不规则性。(h)建立了一种反分析方法，为浮动磁头滑块的设计提供了一种有效的工具。(i)建立了磁头浮动块跟踪特性的频域分析方法。建立了磁头浮动块对磁盘表面振动响应特性的测试与评价方法。少

For improving the performance of a hydrostatic air bearing spindle and a flying slider had bearing for magnetic disk recording, this research project aims at development of a system for measurement, analysis and evaluation of is and evaluation of nano-dynamics of these precise machine elements. The results of this study are as follows.(a) The resolution and S/N of three kinds of precision vibrometers are compared to determine which vibrometers should be used on each measurement.(b) A method of separating the non-repeatable from the repeatable components of the spindle vibrations in the measured signal of vibrometer is proposed. A method of separating the repeatable spindle vibration from the surface irregularity is also proposed.(c) The rotating accuracy of the magnetic disk spindle and the hydrostatic air bearing spindle are measured by using above-discribed method with precision.(d) The lowest three vibration medes, natural frequencies and damping ratioes can be the oretically predic … More ted from the combination of lubrication analysis of bearing air film and dynamics of rigid rotor and bearing.(e) Effects of bolted joints between thrust plates and journal on the vibration characteristics of the rotor can be evaluated by using the FEM and experimental modal analysis.(f) Vibration characteristics of air bearing spindle can be theoretically estimated by coupling the lubrication analysis of air film based on Reynolds equation and the structural analysis of spindle rotor by FEM.(g) A measurement method of transfer function of rotating air bearing spindle is proposed. This method can remove the surface irregularity from the detected response signal.(h) An inverse analysis method is established to provide an efficient tool in designing flying head slider.(i) Frequency domain analysis of the tracking characteristics of flying head slider is formulated. The measurement and evaluation way of response characteristics of flying head slider to disk surface vibration is established. Less