基于容腔调节的钢轨打磨压力控制系统

Pressure Control System for Rail Grinding Based on Chamber Adjustment

为了降低钢轨打磨过程中的压力波动,采用在传统气动恒压控制系统中加入容腔调节器的方法构建新型钢轨打磨压力控制系统.容腔调节器由储气罐与比例流量阀构成,能够在系统受到压力冲击时吸收冲击压力,降低压力波动,并在系统需要输出压力时补充系统供能,加速系统响应.为了保障钢轨打磨控制的精确性与稳定性,所研究的钢轨打磨压力系统采用了双闭环的形式,以变结构控制为基础,结合每个闭环的控制特性来构建控制器.为了验证所提出控制系统的特性,分别以系统仿真与打磨实验的形式与传统钢轨打磨压力控制系统进行对比.结果显示,与传统系统相比,本文所提出的容腔调节控制系统控制压力波动降低了76.8%.

To reduce the pressure fluctuation during rail grinding operation,a new rail grinding pressure control system was proposed by adding a chamber adjuster into the traditional pneumatic constant pressure control system. The chamber adjuster consisted of a gas holder and a proportional flow valve. It could absorb the shock pressure exerting on the system to reduce the pressure fluctuation and supplement energy for the system when delivery pressure was needed to accelerate system response. To ensure the accuracy and stability of the rail grinding pressure control,the rail grinding pressure system with chamber adjuster adopted a double closed-loop control system based on variable structure control,and the controller was designed according to the control characteristic of each closed loop. In addition,the characteristics of the proposed control system were verified by numerical simulation and grinding experiments,and compared with those of the traditional rail grinding pressure control system. The results show that the chamber adjustment control system could reduce 76. 8% of the pressure fluctuation in the traditional pressure control system.