潜孔钻机回转液压系统的建模与仿真

Modeling and Simulation of Rotating Hydraulic System in Down-the-Hole Drill

考虑到潜孔钻机的工作特点,研究潜孔钻机回转液压系统的建模方法,进而对其动态特性进行分析,研究表明,功率键合图建模方法适合具有非线性特点的液压系统的建模仿真。建立了系统的功率键合图,并根据键合图变量间的逻辑关系,导出了的系统状态方程,并利用所建立的数学模型,在Simulink环境下对系统进行研究分析,得到了变量泵出口流量阶跃响应与液压马达进口压力特性曲线,结果表明,系统的仿真结果接近于实际试验数据,证明了仿真的正确性,这为系统进一步的性能评价及优化设计奠定了基础。

Considering the working characteristics of DTH Drill and after researching the modeling method of hydraulic system, the paper chooses the power bond graph to model the nonlinear hydraulic system. A power bond graph is formulated for the rotating hydraulic system in Down - The - Hole Drill （ DTH ） according to working principle. Based on logistical relations amongst system variables, a state function is exploited in the form of a mathematical model. In this way, the step response of pump outlet flux and the inlet pressure change of hydraulic motor are obtained by using Simulink TM. The results indicate the validity of this simulation by comparing to the experiment data. This research provides a foundation for the performance evaluation and optimization design of the system.