基于LabVIEW的车体静强度试验台测控系统

车体静强度试验需要通过液压缸对车体进行作用力加载。针对传统车体静强度试验台手动调节液压缸作用力操作复杂、精度低以及试验台信息化程度低、监管困难等问题,基于LabVIEW设计了车体静强度试验台测控系统。基于LabVIEW开发了该测控系统上位机软件,在控制算法上,针对液压缸加载特性和系统安全性、鲁棒性的要求,对PID(proportion integration differentiation,比例积分微分)算法进行改进并基于自适应算法对PID参数进行调整;选择S7-200 SMART PLC(programmable logic controller,可编程逻辑控制器)作为下位机来对液压泵站进行控制,上、下位机间采用OPC(object linking and embedding for process control,过程控制中的对象链接和嵌入)技术进行通信;基于以太网开发了试验台信息化系统,并设计了信息化流程。试验结果证明:该测控系统实现了对液压缸作用力的快速、准确控制,具有较强的安全性和鲁棒性;达到了对液压泵站远程操作、数据实时采集及对试验台信息化管理的目标。该测控系统可推广至需对液压缸作用力进行自动控制和对系统信息化要求较高的实际应用中。

Measurement and control system for car body static strength test bench based on LabVIEW

The static strength test of car body needs to be loaded by the hydraulic cylinder. Aiming at the problems of the manual adjustment of hydraulic cylinder force with complicated operation and low precision and the bench with low degree of informationization and difficult supervision in the traditional car body static strength test, a measurement and control system for car body static strength test bench was designed based on LabVIEW. The upper computer software of the measurement and control system was developed based on LabVIEW. According to the loading characteristics of the hydraulic cylinder and the requirements for system safety and robustness, the PID （proportion integration differentiation）algorithm was improved and the PID parameters were adjusted based on the adaptive algorithm. The S7-200 SMART PLC（programmable logic controller）was chose as the slave computer to control the hydraulic pump station, and the OPC （object linking and embedding for process control） technology was used for communication between upper computer and slave computer. The test bench information system was developed based on the Ethernet and the information process was designed. The test results proved that the measurement and control system realized the control of the hydraulic cylinder force quickly and accurately with strong safety and robustness, and achieved the goal of remote operation and real-time data acquisition of the hydraulic pump station and information management of the test bench. The measurement and control system can be extended to practical applications that require the automatic control of hydraulic cylinder force and the high informationization of system.