液压静力压桩机油泵溢流阀建模控制优化仿真

Modeling Controlling and Optimization Simulation of the Hydraulic Static Piling Driver's Pump Relief Valve

针对液压静力压桩机油泵溢流阀建压时间过长的问题,为探究阀中各参数对其建压过程的影响规律,运用功率键合图法建立了阀的数学模型,运用Matlab仿真软件分析了阀主要参数对其建压过程的影响规律,并通过现场实验验证了所建模型的正确性。定义了阻尼孔结构参数Cf,以衡量细长阻尼孔的阻尼大小。研究结果表明:主阀阻尼孔结构参数及主阀弹簧刚度对建压时间、卸荷压力以及高压溢流压力均有影响,且前者不得小于2.5 mm-3,后者不得大于20×103N/m;主阀弹簧预压缩量仅对建压时间有明显影响,先导阀各参数仅对高压溢流压力有影响;主阀芯与先导阀芯质量对建压过程无明显影响。参数优化后溢流阀的建压时间可缩短84%。研究为油泵溢流阀性能优化提供了参考。

In order to reduce thepressure building time of the oil pump relief valve of the hydraulic static piling driver, the influence of key parameters of the valve on the pressure building process is studied through modeling and simulation method. A mathematical model of the valve is established through the bond graph method, the effects of the valve parameters are analyzedthrough Matlab, andan experiment is conducted to verify the simulation model. To measure the damping of the long and thin orifice more simply, a parameter named Damping Orifice Structure Parameter （Cf） is defined. The results indicate that, Cf of the main valve and the stiffness of the main valve spring affect the pressure building time, the unloading pressure and the high over flow pressure. The fomler shouldnot be smaller than 2.5ram-3 and the later one shouldnot be bigger than 20× 10^3 N/m. The pre-eompression of the main valve spring only has obvious effects on the pressure building time, and parameters of the pilot valve only influence the high over flow pressure. Neither the main valve spool mass nor the pilot valve spool mass has obvious effects on the pressure building process. After parameters optimization, the pressure building time can be reduced by 84%.