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7 条记录 (耗时 0.088 秒)

    Piezoelectric film sonic emitter
    5.
    发明授权
    Piezoelectric film sonic emitter 有权
    压电薄膜声发射体

    公开(公告)号：US06606389B1

    公开(公告)日：2003-08-12

    申请号：US09388787

    申请日：1999-09-02

    申请人： Alan Robert Selfridge ,  Pierre Khuri-Yakub

    发明人： Alan Robert Selfridge ,  Pierre Khuri-Yakub

    IPC分类号： H04B300

    CPC分类号： G10K15/02 ,  H04R17/00 ,  H04R2217/03

    摘要： A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate. The thin film at the apertures distends into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to thereby create a compression wave in a surrounding environment. Parametric ultrasonic frequency input is supplied to the piezoelectric film to propagate multiple ultrasonic frequencies having a difference component corresponding to the desired subsonic, sonic or ultrasonic frequency range.

    摘要翻译： 一种用于发射亚音速，声波或超声压缩波的扬声器装置，包括附接到滚筒的刚性发射器板，以及形成在该板内的多个孔，该多个孔由设置在发射极板上的薄压电薄膜覆盖。 孔处的薄膜扩张成能够响应于压电薄膜上施加的电输入的变化而收缩和延伸的弓形发射器配置，从而在周围环境中产生压缩波。 将参数超声波频率输入提供给压电膜，以传播具有对应于期望的亚音速，声波或超声波频率范围的差分分量的多个超声波频率。

    Piezoelectric film sonic emitter
    6.
    发明授权
    Piezoelectric film sonic emitter 有权
    压电薄膜声发射体

    公开(公告)号：US07376236B1

    公开(公告)日：2008-05-20

    申请号：US09478114

    申请日：2000-01-04

    申请人： Joseph O. Norris ,  James J. Croft, III ,  Alan Robert Selfridge ,  Pierre Khuri-Yakub

    发明人： Joseph O. Norris ,  James J. Croft, III ,  Alan Robert Selfridge ,  Pierre Khuri-Yakub

    IPC分类号： H04R3/00

    CPC分类号： H04R17/00

    摘要： A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a generally hollow drum, a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate. A pressure source is coupled to the drum for developing a biasing pressure with respect to the thin film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to thereby create a compression wave in a surrounding environment. Parametric ultrasonic frequency input is supplied to the piezoelectric film to propagate multiple ultrasonic frequencies having a difference component corresponding to the desired subsonic, sonic or ultrasonic frequency range.

    摘要翻译： 一种用于发射亚音速，声波或超声波压缩波的扬声器装置，其包括大致中空的鼓，附接到滚筒的刚性发射器板以及形成在该板内的多个孔，该多个孔由设置在发射极板上的薄压电薄膜覆盖。 压力源耦合到滚筒，用于相对于孔处的薄膜产生偏置压力，以将薄膜扩展成弓形发射器配置，其能够响应于在压电薄膜上施加的电输入的变化而收缩和延伸， 从而在周围环境中产生压缩波。 将参数超声波频率输入提供给压电膜，以传播具有对应于期望的亚音速，声波或超声波频率范围的差分分量的多个超声波频率。

    Method and apparatus to provide dynamic ultrasonic measurement of rolling element bearing parameters
    7.
    发明授权
    Method and apparatus to provide dynamic ultrasonic measurement of rolling element bearing parameters 失效
    提供动态超声波测量滚动体轴承参数的方法和装置

    公开(公告)号：US06571632B1

    公开(公告)日：2003-06-03

    申请号：US09573644

    申请日：2000-05-18

    申请人： Richard W. Browner ,  Richard L. Lemoine ,  Mark I. Jurras, III ,  David Nguyen ,  Robert Domnitz ,  Alan Robert Selfridge

    发明人： Richard W. Browner ,  Richard L. Lemoine ,  Mark I. Jurras, III ,  David Nguyen ,  Robert Domnitz ,  Alan Robert Selfridge

    IPC分类号： G01M1304

    CPC分类号： G01L5/0009 ,  F16C19/52 ,  G01M13/04 ,  G01N2291/02845

    摘要： An acoustic signal unit comprises a signal generation unit to generate a first electrical signal, a first transducer to generate an acoustic signal in response to the first electrical signal, and a second transducer to generate a second electrical signal in response to the received acoustic signal. A calculation unit is provided to compare the first and second electrical signals to determine the time of flight of the acoustic signal, wherein the time of flight corresponds to the stress in the rolling element bearing. The stress may be calculated according to a formula or by multiplying an acoustic time constant for the rolling element bearing by the distance traveled by the acoustic signal across the rolling element bearing, and by the time of flight determined by said comparison unit.

    摘要翻译： 声信号单元包括产生第一电信号的信号产生单元，响应于第一电信号产生声信号的第一换能器，以及响应于所接收的声信号产生第二电信号的第二换能器。 提供计算单元以比较第一和第二电信号以确定声信号的飞行时间，其中飞行时间对应于滚动元件轴承中的应力。 可以根据公式计算应力，或者通过将滚动元件轴承的声学时间常数乘以由声学信号穿过滚动元件轴承所经过的距离乘以由所述比较单元确定的飞行时间来计算。