公开(公告)号：US3829848A

公开(公告)日：1974-08-13

申请号：US12871971

申请日：1971-03-29

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： EICKELBERG J ,  RICE J

IPC: D21F1/00 ,  D21G9/00 ,  G08B21/00

CPC classification number: D21G9/0009 ,  D21F1/00

Abstract: A system for and method of determining if an actuator, such as a motor driving a stem of a valve in a line feeding a fibrous slurry to a paper making machine, is in a stuck condition includes a position transducer for the actuator. A control signal for the actuator may be periodically supplied to the actuator. A computer responds to the magnitude of the control signal and an indication of the actual position of the actuator, as derived by an analog-to-digital converter responsive to a position transducer for the actuator. The computer compares the position of the actuator before and after the control signal is supplied to the actuator. In response to the two positions being the same, a signal indicative of the amount the actuator should have moved in response to the control signal is derived and compared with a predetermined value for the minimum amount of detectable movement for the actuator to derive a stuck actuator alarm signal selectively.

Abstract translation: 一种系统和方法，用于确定诸如驱动管线中的阀门的马达的致动器是否处于卡纸状态，该状态包括用于致动器的位置传感器。 可以将致动器的控制信号周期性地提供给致动器。 计算机响应控制信号的大小以及响应于用于致动器的位置传感器的模拟 - 数字转换器得出的致动器的实际位置的指示。 计算机将执行器的位置与控制信号提供给执行器之前和之后进行比较。 响应于两个位置相同，导出指示致动器响应于控制信号的量的量的信号，并将其与用于致动器的可检测运动的最小量的预定值进行比较以导出卡住的致动器 报警信号选择。

公开(公告)号：US3852578A

公开(公告)日：1974-12-03

申请号：US837770

申请日：1970-02-03

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： RICE J

IPC: B21B41/12 ,  D21G9/00 ,  G05B13/02 ,  D21D1/20 ,  D21F1/06

CPC classification number: D21G9/0027 ,  B21B41/12 ,  B65H2557/2644 ,  D21G9/0036 ,  G05B13/024 ,  Y10S162/11

Abstract: A controller for a machine or process having a transportation lag is responsive to a signal sampled at time intervals less than the time required for the transportation lag. The sampled signal is fed to a controller which drives the machine prior to completion of the time required for the transportation lag. A negative feedback loop around the controller includes a transfer function indicative of the d.c., steady state response of the machine being controlled and a positive feedback loop indicative of the total transfer function of the machine being controlled, including the transportation lag thereof. A further negative feedback loop is provided between the machine output and the controller input. In a specifically disclosed embodiment, full corrections to errors of moisture and fiber content of a fibrous sheet are made within a transportation lag between a slurry input point of a headbox and scanning gauges located downstream of a dryer.

Abstract translation: 具有运输滞后的机器或过程的控制器响应于以小于运输滞后所需时间的时间间隔采样的信号。 采样信号被馈送到在运输滞后所需时间完成之前驱动机器的控制器。 控制器周围的负反馈环路包括指示所控制的机器的直流，稳态响应的传递函数和指示所控制的机器的总传递函数的正反馈回路，包括其运输滞后。 在机器输出和控制器输入之间提供进一步的负反馈回路。 在具体公开的实施例中，在流浆箱的浆料输入点和位于干燥器下游的扫描计量器之间的运输滞后期间，对纤维片材的水分和纤维含量的误差进行全面校正。