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    • 3. 发明授权
    • Control system for suppressing wheel squealing noise produced by railroad car retarders
    • 用于抑制由铁路车辆缓速器产生的轮啸声的控制系统
    • US3888183A
    • 1975-06-10
    • US48414074
    • 1974-06-28
    • WESTINGHOUSE AIR BRAKE CO
    • NOBLE PETER M
    • B61H11/00B61K7/08B61K7/12F16D65/00B61B1/00
    • B61K7/08B61H11/00B61K7/12F16D65/0012
    • This disclosure relates to a control system for suppressing wheel squealing noises produced by an activated frictional type of fluid pressure operated railroad car retarder. A microphonic transducer is disposed in the immediate vicinity of the car retarder for picking up and converting the sound wave pressures into alternating current signals. A band-pass filter network is arranged to pass a select band of frequencies of the alternating current signals. A diode rectifier converts the passed alternating current signals into a d.c. voltage. An integrating circuit produces an output signal which is substantially the time integral of the d.c. input voltage. An operational amplifier compares the output signal of the integrating circuit with an input reference signal and produces an output signal when the output signal is greater than the input reference signal. The output signal drives a power amplifier for causing the energization of an electromagnetic exhaust valve which deactivates the car retarder.
    • 本公开涉及一种用于抑制由激活的摩擦型流体压力操作的铁路车辆缓速器产生的轮子鸣叫噪声的控制系统。 麦克风换能器设置在汽车延迟器附近,用于拾取和将声波压力转换成交流信号。 带通滤波器网络布置成传递交流信号的选择频带。 二极管整流器将传递的交流信号转换成直流。 电压。 积分电路产生输出信号,其基本上是直流电的时间积分。 输入电压。 运算放大器将积分电路的输出信号与输入参考信号进行比较,并在输出信号大于输入参考信号时产生输出信号。 输出信号驱动功率放大器,使电磁排气阀通电,这使停车缓速器失效。
    • 5. 发明授权
    • Single guide member transit vehicle switching mechanism
    • 单指导会员交通车辆切换机制
    • US3661091A
    • 1972-05-09
    • US3661091D
    • 1969-12-23
    • WESTINGHOUSE AIR BRAKE CO
    • NOBLE PETER M
    • E01B25/12E01B7/04
    • E01B25/12
    • This disclosure relates to a roadway switch for self-guided vehicles having at least two selectable routes of travel. The switch includes at least two movable I-beams each having one end pivotally mounted for movement in two modes. A rotatable member supports the outer end of each of the movable I-beams and permits movement of the other end of the I-beams in three modes. An electric motor is incorporated for rotating the rotatable member between a first and second position whereby one of the I-beams establishes the route of travel for the self-guided vehicles.
    • 本公开涉及一种具有至少两个可选择的行进路线的用于自行车的车道开关。 开关包括至少两个可移动的I型梁,每个可移动的I型梁各自具有枢转地安装以便以两种模式运动的一端。 可旋转构件支撑每个可移动的I形梁的外端,并允许I型梁的另一端以三种模式移动。 并入电动马达,用于在第一和第二位置之间旋转可旋转构件,由此其中一个I形梁确定了自行车辆的行进路线。