基于LabVIEW的吞雨测控系统

Rain Swallowing Measurement and Control System Based on LabVIEW

本文通过Simulink建模仿真,分析在不同控制器模式下系统对阶跃信号的响应,为系统选择最合适的控制器。以此为依据完成了测控系统的电路设计、软件设计及实现。在后续的试验过程中发现,系统在控制流量的过程中出现振荡收敛及流量信号大扰动的现象。分析后得出,由于供水系统设计的缺陷,导致经典PID控制效果不理想,采用基于LabVIEW的积分分离PID算法对系统控制软件进行改进,解决了控制过程振荡收敛的问题,并取得了较好的控制效果。此外,通过信号隔离镜像的方法解决了流量传感器同时传输瞬时流量和累积流量时,瞬时流量信号出现大扰动信号的问题。

Through Simulink modeling and simulation,this paper analyzes the response of the system to the step signal under different controller modes,and selects the most appropriate controller for the system.Based on this,the circuit design,software design and implementation of the measurement and control system are completed.In the course of subsequent tests,oscillation convergence and large disturbance of flow signal appear in the process of flow control.After analysis,it is concluded that the classical PID control effect is not ideal due to the defects of water supply system design.The integral separation PID algorithm based on LabVIEW is used to improve the system control software,solve the problem of oscillation convergence in the control process,and achieve good control effect.At the same time,the problem that the instantaneous flow signal appears big disturbance when the flow sensor transmits instantaneous flow and cumulative flow simultaneously is solved by signal isolation mirror method.