NI PXIe嵌入式电液伺服同步系统设计

为了合理选择控制方法和测控系统以提高电液伺服同步系统同步精度,基于同步系统多回路特性,针对控制方法改进提出了在各回路中添加控制器进行信号预处理;采用基于NI PXIe嵌入式平台的测控系统,结合PXIe-8133嵌入式实时控制器与PXIe-4300同步采集卡,在高速采集的同时提高液压系统的同步特性;PC端采用LabVIEW编写试验台的测控程序,实现系统的精确控制与数据的实时采集及后处理,并对两缸同步电液伺服系统进行初步试验研究,实现了液压系统数据的同步采集和实时控制.结果发现,两缸同步的系统误差由0.40 mm减小至0.15 mm,取得了良好的控制效果,达到了设计要求.设计体现了嵌入式测控平台兼具高速性与可靠性的优势,在同步系统控制中具有优越性,可以有效提高圆筒阀与调速器控制系统的同步精度.

Design of embedded electro-hydraulic servo synchronous system

Reasonable control method and high-performance measurement and control system can effectively enhance the synchronization accuracy of electro-hydraulic servo system, which is of great significance for improving the performance of cylindrical valve and governor of a turbine. Considering the characteristics of synchronous multi-loop system, an improved control method was proposed to add controller to each circuit for signal pre-processing. The measurement and control system is based on PXIe embedded platform, combining the advantage of embedded R-T controller and synchronization data acquisition card to gain efficient control over the system and the software employed by LabVIEW is responsible for data collecting and processing. Preliminary test was made on the two-cylinder synchronous system. The results show that this hydraulic system works well and achieves the design requirement. System′s synchronous errors reduce from 0.40 mm to 0.15 mm and meet the requirement. The design reflects that embedded system is superior in the control of synchronous system as its high speed and reliability, it can effectively improve the control accuracy of the cylinder valve and speed governor.