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公开(公告)号：US3735261A
公开(公告)日：1973-05-22
申请号：US3735261D
申请日：1971-06-07
Applicant: NORTHROP CORP
Inventor： VAHLSTROM R , NUTTEN D , RENNICK L , BAYNE D , OSTER ST
Abstract: Rise time, fall time, and width of a single short duration pulse are measured with no a priori knowledge of the pulse. First and second level detectors are used to respectively start and stop a ramp generator. The level detectors are biased to fire at certain defined percentages of the leading and/or trailing edge of the pulse depending upon which time parameter the detectors are measuring. A peak level detector and hold circuit connected to the ramp generator output gives a voltage amplitude proportional to the ''''on'''' time of the generator and thus indicative of the time interval being measured. To supply the level detectors with the proper information, an input and logic section produces from the incoming (positive) pulse its peak amplitude, negative peak amplitude, a delayed positive pulse, a delayed negative pulse, and timing signals for enabling and disabling the level detectors as necessary.
Abstract translation: 在没有脉冲的先验知识的情况下测量单个短持续时间脉冲的上升时间，下降时间和宽度。 第一和第二电平检测器用于分别启动和停止斜坡发生器。 根据检测器正在测量的时间参数，电平检测器被偏置为以脉冲的前沿和/或后沿的某些确定的百分比发射。 连接到斜坡发生器输出的峰值电平检测器和保持电路给出与发电机的“接通”时间成比例的电压振幅，并因此指示所测量的时间间隔。 为了向电平检测器提供正确的信息，输入和逻辑部分从输入（正）脉冲产生其峰值幅度，负峰值幅度，延迟正脉冲，延迟负脉冲和用于启用和禁用电平的定时信号 检测器是必要的。
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公开(公告)号：US3733892A
公开(公告)日：1973-05-22
申请号：US3733892D
申请日：1972-04-03
Applicant: NORTHROP CORP
Inventor： RENNICK L
CPC classification number: G01H1/003
Abstract: A pulse signal is generated which is a precise multiple of the rotation frequency of a machine to be tested. A sensor is utilized to generate an electrical signal in accordance with vibration developed in the machine with its rotation. Low frequency components of this signal are filtered out therefrom and these filtered signals fed to a pair of switching circuits. The pulse signals in accordance with the rotation of the machine are fed to a switching signal generator where quadrature related signals synchronized with the machine rotation are developed. These quadrature related signals are fed to the switching circuits as the switching control therefor, so as to provide samplings of the vibration signals in quadrature relationship. The outputs of the switching circuits are each integrated and squared, the squared signals then being summed. These summed output signals are then fed to an indicator which provides the indication of the amplitude of vibrational components at the machine rotation frequency or a harmonic thereof.
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公开(公告)号：US3813931A
公开(公告)日：1974-06-04
申请号：US34170373
申请日：1973-03-15
Applicant: NORTHROP CORP
Inventor： RENNICK L , MITCHAEL W
CPC classification number: G01M15/06
Abstract: A rotating portion such as a drive shaft of a machine has a marker placed thereon to indicate a predetermined portion of the rotation cycle. A signal from this marker is sensed by a sensor each time the machinery passes through this portion of the rotation cycle. A ramp generator develops a ramp signal in response to the output of the sensor. The peak of the ramp signal is detected and this peak signal fed to a calibration potentiometer by means of which a percentage of the peak signal can be selected. The output of the potentiometer and that of the ramp generator are fed to a voltage comparator which triggers a pulse generator when the ramp reaches the voltage set on the potentiometer. The output of the pulse generator actuates a strobe light which is used to detect a marker on the machinery indicative of a precise rotational position, the potentiometer being adjusted until the strobe light is precisely synchronized with this marker. Thus a calibration is achieved whereby the output pulse precisely indicates a predetermined rotational position of the machinery. This output pulse can then be used with other measurement circuitry, without further requirement of the strobe light.
Abstract translation: 诸如机器的驱动轴的旋转部分具有放置在其上的标记，以指示旋转周期的预定部分。 每当机械通过旋转周期的这一部分时，传感器就会感测到来自该标记的信号。 斜坡发生器响应于传感器的输出产生斜坡信号。 检测到斜坡信号的峰值，并将该峰值信号馈送到校准电位计，借此可以选择峰值信号的百分比。 电位计和斜坡发生器的输出馈送到电压比较器，当斜坡达到电位器上设置的电压时，触发脉冲发生器。 脉冲发生器的输出启动闪光灯，该闪光灯用于检测机器上的指示精确旋转位置的标记，调节电位计直到闪光灯与该标记精确同步。 因此，实现校准，由此输出脉冲精确地指示机械的预定旋转位置。 该输出脉冲随后可与其他测量电路一起使用，而不需要闪光灯。
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公开(公告)号：US3777559A
公开(公告)日：1973-12-11
申请号：US3777559D
申请日：1972-04-21
Applicant: NORTHROP CORP
Inventor： MITCHAEL W , WEISS R , RENNICK L , SHORE J , ALMICH C
Abstract: A first counter is driven by pulses from a signal generator. A second counter is driven by the output of the signal generator divider by a factor in accordance with the number of cylinders in the engine under test. The output of the second counter is shifted to a register in response to a pulse which is phase synchronized with a predetermined point in the rotation cycle of the engine. The output of the register and the output of the first counter are compared for coincidence, a coincidence signal being generated which corresponds to a predetermined point in the cycle of each of the engine cylinders. These coincidence signals are used to generate window signals which provide gating signals to sensor circuits. The sensor circuits receive the outputs of sensors which provide electrical signals in accordance with various engine parameters. The outputs of the sensor circuits are gated to an indicator by the window signals so that the sensed parameters can be observed at predetermined identifiable portions of each engine rotation cycle.
Abstract translation: 第一计数器由来自信号发生器的脉冲驱动。 第二计数器由信号发生器分压器的输出根据被测引擎中的气缸数量的因数驱动。 响应于与发动机的旋转周期中的预定点相位同步的脉冲，第二计数器的输出被移位到寄存器。 将寄存器的输出和第一计数器的输出进行比较，以便一致，产生与每个发动机气缸的循环中的预定点对应的一致信号。 这些重合信号用于产生向传感器电路提供门控信号的窗口信号。 传感器电路接收根据各种发动机参数提供电信号的传感器的输出。 传感器电路的输出通过窗口信号门控到指示器，使得可以在每个发动机旋转周期的预定可识别部分处观察感测的参数。
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