论文部分内容阅读
阀控非对称缸系统因结构的不对称,正反向动态特性差异很大。建立了包含死区的阀控非对称液压缸系统数学模型。根据流入和流出流量的比例关系,提出了非对称控制策略。通过对比例阀正反两方向设置不同的最大输出流量、死区流量、参考输入和放大系数以实现正反向速度一致。以大型挤压机节流调速系统为工程实例,应用非对称控制策略,实现了节流系统中水阀正反方向特性一致。试验结果验证了建模分析的正确性和非对称控制策略的有效性,为大载荷作用下比例控制系统设计提供了基础。
Valve control asymmetric cylinder system due to structural asymmetry, positive and negative dynamic characteristics vary widely. A mathematical model of valve controlled asymmetric hydraulic cylinder system with dead zone is established. According to the proportional relationship between inflow and outflow, an asymmetric control strategy is proposed. By comparing the positive and negative directions of the proportional valve, different maximum output flow rate, dead-zone flow rate, reference input and amplification factor are set to achieve the same positive and negative speed. A large-scale extrusion throttling speed control system is taken as an example of engineering, the application of asymmetric control strategy to achieve the throttling system in the positive and negative direction of the valve features the same. The test results validate the correctness of the modeling analysis and the effectiveness of the asymmetric control strategy, and provide the basis for the design of the proportional control system under large load.