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1. 发明授权

US5952621A Sound attenuation system and related method 失效
标题翻译：声衰减系统及相关方法
公开(公告)号：US5952621A
公开(公告)日：1999-09-14
申请号：US60070
申请日：1998-04-15
申请人： Alan R. D. Curtis , Richard Madden , Paul J. Remington
发明人： Alan R. D. Curtis , Richard Madden , Paul J. Remington
IPC分类号： B64D33/02 , F02C7/045
CPC分类号： F02C7/045 , B64D33/02 , B64D2033/0206 , B64D2033/0286 , F05D2260/96 , F05D2260/962 , Y02T50/671
摘要： The present invention is noise attenuation system and related method for suppressing noise generated by a noise source, such as a jet engine, contained in a housing. An impedance device is positioned in the housing to attenuate the amplitude of sound waves generated by the noise source propagating in one direction and to create a reflected sound wave. The reflected sound wave is out of phase with the sound waves propagating from the noise source away from the impedance device. The reflected sound wave destructively interferes with this sound wave to attenuate the amplitude.
摘要翻译：本发明是噪声衰减系统和相关方法，用于抑制由包含在壳体中的诸如喷气发动机的噪声源产生的噪声。阻抗装置位于壳体中以衰减由沿一个方向传播的噪声源产生的声波的振幅并产生反射的声波。反射的声波与从噪声源传播的声波远离阻抗装置异相。反射的声波破坏性地干扰这个声波来衰减幅度。

2. 发明授权

US5831401A Impedance controller 失效
标题翻译：阻抗控制器
公开(公告)号：US5831401A
公开(公告)日：1998-11-03
申请号：US823867
申请日：1997-03-25
申请人： Ronald B. Coleman , Alan R. D. Curtis , Paul J. Remington
发明人： Ronald B. Coleman , Alan R. D. Curtis , Paul J. Remington
IPC分类号： F16F15/02 , G05D19/02 , G10K11/02 , G10K11/16 , H02K33/00
CPC分类号： G10K11/16 , F16F15/02 , G05D19/02 , G10K11/02
摘要： The system disclosed herein controls the vibratory energy radiated from a structure subject to excitation from an outside disturbance by enforcing a preselected mechanical impedance upon at least one point in the structure using an electromechanical transducer connected to the structure at that point. The transducer is energized in response to the output of an adjustable or adaptable filter. Sensors provide signals representing the force applied by the transducer and the resultant velocity. The force and velocity signals are applied as inputs to the adaptable filter through circuit means including a component providing an electrical analog of the preselected mechanical impedance. The adaptable filter is then controlled to reduce the amplitude of the input signal applied to the filter, i.e. the error between the measured mechanical impedance and the desired impedance.
摘要翻译：本文公开的系统通过使用连接到该点处的结构的机电换能器在结构中的至少一个点上施加预选的机械阻抗来控制从外部干扰受到激励的结构辐射的振动能量。传感器响应于可调节或适应性过滤器的输出而通电。传感器提供表示由换能器施加的力和合成速度的信号。力和速度信号通过包括提供预选机械阻抗的电气模拟的部件的电路装置作为适应滤波器的输入。然后控制适应性滤波器以减小施加到滤波器的输入信号的幅度，即所测量的机械阻抗与期望阻抗之间的误差。

3. 发明授权

US5471106A Methods and apparatus for closed-loop control of magnetic bearings 失效
标题翻译：磁轴承闭环控制方法及装置
公开(公告)号：US5471106A
公开(公告)日：1995-11-28
申请号：US233538
申请日：1994-04-26
申请人： Alan R. D. Curtis , James E. Joseph
发明人： Alan R. D. Curtis , James E. Joseph
IPC分类号： F16C39/06 , G01B7/14 , G01B7/312 , H02K7/09
CPC分类号： G01B7/312 , F16C32/0448 , F16C32/0455 , G01B7/144
摘要： A magnetic bearing control system for a rotating shaft, for example, includes a plurality of electromagnets disposed around and in close proximity to the surface of the shaft. The control system provides a bias current to the electromagnets to maintain the shaft in a null position. Levitation of the shaft is controlled by a levitation controller, and disturbance rejection is effected by a disturbance rejection controller. Flux sensors, suitably located near the electromagnets, determine the magnitude and polarity of the flux resident in the gap between each electromagnet and the shaft. The controller determines the size of the gap based on the flux and generates a corresponding control signal to maintain the position of the shaft within the bearing.
摘要翻译：用于旋转轴的磁性轴承控制系统例如包括设置在轴的表面周围并且紧邻轴的表面的多个电磁体。控制系统向电磁铁提供偏置电流以将轴保持在无效位置。轴的悬挂由悬浮控制器控制，并且干扰抑制由干扰抑制控制器实现。适当位于电磁铁附近的磁通传感器确定驻留在每个电磁体和轴之间的间隙中的磁通量的大小和极性。控制器基于通量确定间隙的尺寸，并产生相应的控制信号，以保持轴在轴承内的位置。

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