Damping for directional sound cancellation
    3.
    发明授权
    Damping for directional sound cancellation 失效
    方向声音消除阻尼

    公开(公告)号:US4669122A

    公开(公告)日:1987-05-26

    申请号:US744734

    申请日:1985-06-14

    Abstract: Sound in ducts can be reduced by using two cancelling sources spaced along the duct, and in order to reduce reflections upstream of the cancelling sources, sounds from these sources may be arranged to be in phase opposition upstream from the sources at all frequencies. Such an arrangement does not provide cancellation downstream at some frequencies. In the invention sound detected by a microphone is processed to generate a drive signal for a first source which tends to cancel sound in the duct partially, the remainder of the cancellation being provided by a sound source. A delay positioned between the sources is such that sounds from these sources are in phase at all frequencies of interest downstream of the second source.

    Abstract translation: 可以通过使用沿着管道间隔开的两个消除源来减少管道中的声音,并且为了减少消除源的上游的反射,来自这些源的声音可以被布置成在所有频率处与源的上游相位相反。 这种布置在某些频率下不提供下游的取消。 在本发明中,处理由麦克风检测到的声音以产生用于第一源的驱动信号,其倾向于部分地消除导管中的声音,其余的消除由声源提供。 位于源之间的延迟使得来自这些源的声音在第二源的下游的所有感兴趣的频率处于同相。

    Attenuation of sound waves
    4.
    发明授权
    Attenuation of sound waves 失效
    声波衰减

    公开(公告)号:US4596033A

    公开(公告)日:1986-06-17

    申请号:US704028

    申请日:1985-02-21

    Abstract: When sound waves are intentionally attenuated by systems using destructive interference temporal changes sometimes cause less than optimum performance. In the present invention the transfer function of a signal processing system connected between a sound detector and a sound generator destructively interfering with an unwanted sound is modified at intervals as a result of sequential measurements of the transfer function between the sound detector and a further sound detector downstream from the generator. For this purpose a data processor calculates the required transfer function and causes a data processor to vary the coefficients of a digital filter comprising the signal processing system.

    Abstract translation: 当使用破坏性干扰的系统有意地衰减声波时,时间变化有时会导致不到最佳性能。 在本发明中,作为连续测量声音检测器和另外的声音检测器之间的传递函数的结果,间隔地修改了连接在声音检测器和声音发生器之间的信号处理系统的传递函数,该声音检测器和声音发生器相互干扰不需要的声音 下游发电机。 为此,数据处理器计算所需的传递函数,并使数据处理器改变包括信号处理系统的数字滤波器的系数。

    Electromagnet support system
    5.
    发明授权
    Electromagnet support system 失效
    电磁铁支撑系统

    公开(公告)号:US06487061B1

    公开(公告)日:2002-11-26

    申请号:US09492827

    申请日:2000-01-27

    CPC classification number: F16M11/12 F16F15/03 F16M11/043 F16M2200/04

    Abstract: A compliant structure, such as a rubber pad, is used to simplify the resonance pattern of a vibrating object. According to one aspect of the invention, a support system is provided with a device for applying electromagnetic forces to the vibrating object, and the compliant structure is used to support the electromagnetic device. The electromagnetic device is positively controlled as a function of (A) the position of the vibrating object and (B) the position of the electromagnet. The compliant structure may also be used to further attenuate high frequency vibration transmission. According to one aspect of the invention, the compliant structure permits some rocking and/or rotational motion of the electromagnet to simplify the vibration transmission mechanism. According to another aspect of the invention, the compliant structure operates as a slightly-damped stiff spring in the axial direction of the electromagnet.

    Abstract translation: 使用柔性结构,例如橡胶垫,以简化振动物体的共振图案。 根据本发明的一个方面,一种支撑系统设置有用于向振动物体施加电磁力的装置,并且柔性结构用于支撑电磁装置。 电磁装置作为(A)振动物体的位置和(B)电磁体的位置的函数被积极地控制。 柔性结构也可用于进一步衰减高频振动传播。 根据本发明的一个方面,柔性结构允许电磁铁的一些摆动和/或旋转运动来简化振动传递机构。 根据本发明的另一方面,柔性结构在电磁体的轴向上作为稍微阻尼的刚性弹簧而起作用。

    Active control of sound waves
    6.
    发明授权
    Active control of sound waves 失效
    主动控制声波

    公开(公告)号:US4171465A

    公开(公告)日:1979-10-16

    申请号:US931951

    申请日:1978-08-08

    Abstract: A sound wave propagated along a duct through a fluid contained in the duct is attenuated by generating sound waves from an array of sound sources spaced along the duct. Each source generates two waves travelling in opposite directions, the array being operated so that the resultant of those travelling in the same direction as the unwanted wave interferes destructively with the unwanted wave while the resultant of those travelling in the opposite direction is negligible. The array is operated in response to detection of the unwanted wave, the sound detector(s) being so positioned as to introduce a degree of acoustic coupling between the source array and the detection system.

    Abstract translation: 沿管道传播通过包含在管道中的流体的声波通过从沿管道间隔开的声源阵列产生声波来衰减。 每个源产生沿相反方向行进的两个波,该阵列被操作,使得以与不需要的波相同的方向行进的那些的结果与不希望的波相互干扰,而在相反方向上行进的那些波的结果是可以忽略的。 响应于不想要的波的检测而操作阵列,声音检测器被定位成在源阵列和检测系统之间引入一定程度的声耦合。

    Attenuation of sound waves
    7.
    发明授权
    Attenuation of sound waves 失效
    声波衰减

    公开(公告)号:US4589133A

    公开(公告)日:1986-05-13

    申请号:US620751

    申请日:1984-06-14

    Abstract: An active sound control system is described in which allowance is made in a relatively uncomplicated circuit for acoustic coupling between a sound generating system for generating a cancelling sound wave and a detector for sensing a sound wave to be cancelled. Unwanted sound from a source is detected by a microphone and cancelled by sound from a speaker connected by way of an amplifier to the microphone. The amplifier has a feedback processing system with a transfer function which takes account of acoustic feedback between the speaker and the microphone in deriving, with the amplifier, a signal to drive the speaker.

    Abstract translation: 描述了一种主动声音控制系统,其中在用于产生消除声波的声音发生系统和用于感测要消除的声波的检测器之间的声耦合的相对不复杂的电路中进行允许。 来自源的不需要的声音由麦克风检测,并由通过放大器连接到扬声器的扬声器的声音被麦克风取消。 放大器具有具有传递函数的反馈处理系统,其考虑到扬声器和麦克风之间的声反馈,通过放大器得到驱动扬声器的信号。

    Active suspension for a marine platform
    8.
    发明授权
    Active suspension for a marine platform 失效
    主动悬挂海洋平台

    公开(公告)号:US07039512B2

    公开(公告)日:2006-05-02

    申请号:US10379921

    申请日:2003-03-06

    CPC classification number: F16F15/02 B63B17/0081 B63B39/005

    Abstract: An active suspension system is used to control the motion of a passenger seat in a high speed watercraft. A forward looking wave sensor is used in connection with a feed-forward wave impact shock predictor to determine characteristics of impending dynamic forces applied via the impact of the watercraft on waves. Information concerning the impending dynamic forces is used by a passenger seat suspension and control system to attenuate the shock effects on passengers, where such effects are characterized by large-amplitude, short-duration accelerations recurring at a low frequency and/or irregularly.

    Abstract translation: 主动悬挂系统用于控制高速船只中乘客座椅的运动。 前向波传感器与前馈波浪冲击预测器结合使用,以确定通过船舶对波浪的冲击而施加的即将发生的动力的特征。 关于即将发生的动力的信息由乘客座椅悬挂和控制系统用于减弱对乘客的冲击效应,其中这种效应的特征在于以低频率和/或不规则地重复的大幅度,短时间加速度。

    Active suspension for a marine platform
    9.
    发明授权
    Active suspension for a marine platform 失效
    主动悬挂海洋平台

    公开(公告)号:US07418324B2

    公开(公告)日:2008-08-26

    申请号:US10894121

    申请日:2004-07-20

    CPC classification number: F16F15/02 B63B17/0081 B63B39/005

    Abstract: A look-ahead detection system (LADS) that actively controls the suspension of at least some of the seats in a watercraft to drastically reduce the shock and/or vibrations experienced by passengers within the seats caused by waves, other water conditions and/or the bending of the craft as it travels through the water. The look-ahead detection system utilizes downward-looking sensors to help the system predict when the craft will strike the water and how strong the impact will be. That is, the look-ahead detection system uses the sensors to look forward in time and down in space.

    Abstract translation: 一种预先检测系统(LADS),其主动地控制船舶中的至少一些座椅的悬架,以大大减少由波浪,其他水条件和/或所述座椅引起的座椅内的乘客所经历的冲击和/或振动 工艺在穿过水面时弯曲。 先行检测系统利用向下观察的传感器来帮助系统预测船舶何时撞击水面,影响力将会有多大。 也就是说,前瞻检测系统使用传感器在时间上向前看。

    Dynamic degaussing system
    10.
    发明授权
    Dynamic degaussing system 失效
    动态消磁系统

    公开(公告)号:US07113384B2

    公开(公告)日:2006-09-26

    申请号:US10431374

    申请日:2003-05-08

    Abstract: A dynamic degaussing system includes a magnetic field sensor for generating a sensor signal in response to a sensed magnetic field. The magnetic sensor is coupled to a controller that produces an output signal based on the sensor signal. The controller may include feedforward and feedback control loops. The output signal of the controller controls a magnetic field generator which generates a magnetic field so as to attenuate the sensed magnetic field. According to one aspect of the invention, a vessel is provided with a reduced magnetic signature and a control system for controlling magnetic fields about a podded electric motor. The control system employs feed-forward and feedback control in tandem. The control system may be dynamically adapted to changing physical characteristics of the motor. Control signals are generated in response to sensed or predicted magnetic fields internal to, or external to, the motor. The control inputs may be used to modify one or more motor driving currents, or to drive one or more magnetic field generators, so as to attenuate one or more magnetic field components generated by the motor.

    Abstract translation: 动态消磁系统包括用于响应于感测到的磁场产生传感器信号的磁场传感器。 磁传感器耦合到基于传感器信号产生输出信号的控制器。 控制器可以包括前馈和反馈控制回路。 控制器的输出信号控制产生磁场的磁场发生器,以便衰减感测的磁场。 根据本发明的一个方面,容器具有减小的磁性特征和用于控制围绕电动马达的磁场的控制系统。 控制系统采用前馈和反馈控制。 控制系统可以动态地适应于改变电动机的物理特性。 响应于马达内部或外部的感测或预测的磁场产生控制信号。 控制输入​​可以用于修改一个或多个电动机驱动电流,或者驱动一个或多个磁场发生器,以便衰减由电动机产生的一个或多个磁场分量。

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