高水基安全阀动态特性仿真与优化

Dynamical characteristics simulation and optimization of high water-based relief valves

运用功率键合图和状态空间相结合的方法,建立支架立柱用高水基安全阀的动态数学模型,给出必要的约束条件,在Matlab/Simulink环境下实现其动态特性的数字仿真.通过仿真确定对安全阀动态特性影响较大的参数,选择ItAE准则为优化指标函数,得到使安全阀更为稳定、快速的性能参数组合.优化前后的仿真结果表明:适当增加安全阀阀芯的质量和弹簧刚度可以提高系统的相对稳定性,加快安全阀卸载系统的响应速度.

A dynamic mathematic model of high water-based relief valve in supporting post was developed by means of power bond graph combined with state space.After necessary constraint condition being given,the digital simulation of dynamical characteristics of the valve was realized in Matlab/Simulink environment.The parameters that had greater influence on the dynamical characteristics of the valve were determined,then.The ItAE criterion was selected as optimization index function,and the performance parameters combination that would make the relief valve more stable and more rapid was found.Simulation results before and after optimization showed that an appropriate increase of the quality of relief valve spool and spring stiffness could improve the relative stability of the system and up the response of unloading system of relief valve.