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    Method for predicting vibrational characteristics of rotating structures
    2.
    发明授权
    Method for predicting vibrational characteristics of rotating structures 失效
    预测旋转结构振动特性的方法

    公开(公告)号：US07630869B2

    公开(公告)日：2009-12-08

    申请号：US10854608

    申请日：2004-05-26

    申请人： I-Yeu Shen ,  Chaw-Wu Tseng ,  Jr-Yi Shen

    发明人： I-Yeu Shen ,  Chaw-Wu Tseng ,  Jr-Yi Shen

    IPC分类号： G06G7/48 ,  G06F7/60 ,  G06F17/10 ,  G06F17/50

    CPC分类号： G01H1/003 ,  Y02T10/82

    摘要： A method is disclosed for analyzing the vibrational characteristics of rotating devices, such as hard disk drives and jet engines, that are coupled through bearings to flexible supports. In the method, the rotating device is discretized, for example, using a mesh suitable for finite element analysis. The support is also discretized. The natural frequency of elastic vibration modes for the rotating device is calculated and the natural frequency of vibration modes for the support is calculated. The mode shapes are then calculated and a set of modal basis corresponding to the mode shapes is utilized. Bearing stiffness and damping matrices are input, and the Lagrangian equations of motion are integrated numerically in the modal space, to calculate the vibrational response of the rotating device and support. The modal space results are then transformed into ordinary space. The vibrational analysis may be used to design devices having desired vibrational characteristics.

    摘要翻译： 公开了一种用于分析旋转装置（例如硬盘驱动器和喷气发动机）的振动特性的方法，其通过轴承联接到柔性支撑件。 在该方法中，旋转装置例如使用适于有限元分析的网格离散化。 支持也是离散的。 计算旋转装置的弹性振动模式的固有频率，并计算支架的振动模式的固有频率。 然后计算模式形状，并且利用对应于模式形状的一组模态基础。 输入轴承刚度和阻尼矩阵，运动的拉格朗日方程在模态空间中数值积分，以计算旋转装置和支撑件的振动响应。 然后将模态空间结果转换为普通空间。 振动分析可用于设计具有期望的振动特性的装置。

    METHODS AND SYSTEMS FOR IMPROVING ACTUATOR PERFORMANCE BY REDUCING TENSILE STRESSES IN PIEZOELECTRIC THIN FILMS
    7.
    发明申请
    METHODS AND SYSTEMS FOR IMPROVING ACTUATOR PERFORMANCE BY REDUCING TENSILE STRESSES IN PIEZOELECTRIC THIN FILMS 审中-公开
    通过减少压电薄膜中的拉伸应力来提高执行机构性能的方法和系统

    公开(公告)号：US20120245408A1

    公开(公告)日：2012-09-27

    申请号：US13427727

    申请日：2012-03-22

    申请人： I-Yeu Shen ,  Cheng-Chun Lee ,  Clifford R. Hume ,  Guozhong Cao ,  Chuan Luo

    发明人： I-Yeu Shen ,  Cheng-Chun Lee ,  Clifford R. Hume ,  Guozhong Cao ,  Chuan Luo

    IPC分类号： A61F11/04 ,  H04R25/00 ,  H02N2/06

    CPC分类号： H01L41/042 ,  B06B1/0223 ,  B06B1/0688 ,  F04B43/046 ,  H01L41/0973 ,  H02N2/181 ,  H04R17/00

    摘要： Disclosed are methods and systems for improving actuator performance by reducing tensile stresses in piezoelectric thin films. In one embodiment, a piezoelectric actuator includes a substrate, a first electrode positioned on the substrate, a piezoelectric thin film positioned on the first electrode, and a second electrode positioned on the piezoelectric thin film. The displacement capability of the actuator is enhanced by reducing the tensile stresses of the piezoelectric thin film. In some embodiments, a constant DC voltage applied to the piezoelectric actuator generates compressive in-plane stresses, which counteract the tensile in-plane stresses. As a result, the overall tensile stresses in the actuator are reduced, and the actuator displacement is improved.

    摘要翻译： 公开了通过降低压电薄膜中的拉伸应力来改善致动器性能的方法和系统。 在一个实施例中，压电致动器包括基板，位于基板上的第一电极，位于第一电极上的压电薄膜和位于压电薄膜上的第二电极。 通过减小压电薄膜的拉伸应力来增强致动器的位移能力。 在一些实施例中，施加到压电致动器的恒定DC电压产生压缩面内应力，其抵消拉伸面内应力。 结果，致动器中的总拉伸应力减小，致动器位移得到改善。