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中文摘要：
介绍了NHRI-4000型高性能大接触面直剪仪研制与运用情况。采用数字PID模糊控制方式,实现垂直荷载和水平荷载的控制精度;采用MCS51单片机控制单元和多机通信等方式,实现垂直荷载和水平荷载的控制;在硬件电路上采用低通滤波等办法,在软件方面采用定量预测方法平滑测试信号,实现了传感器测量稳定性要求;引入Spcomm控件和定时控件,运用Delphi语言进行编程,实现了自动控制、自动采集、实时绘图等功能。
英文摘要：
The development of NHRI-4000 high performance direct shear apparatus with large contact surface is introduced. The control precision requirements of normal force and shear force are achieved by use of the digital PID fuzzy control method. Mcs51 microcontroller control unit and multi-machine communication are used to control the normal force and shear force. Low-pass filter of the circuit and other techniques of the hardware circuit and a simple moving average technique in software are used to ensure the stability of the signal. The software programmed by Delphi language has the capability of automatic collection and real-time graphics by means of spcomm controls and timing controls.
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