ADAMS二次开发技术在气动潜孔锤虚拟样机建模中的应用

Applications of Secondary Development of ADAMS in Building Pneumatic DTH Hammer Virtual Prototype

气动潜孔锤是一种冲击凿岩设备,动力学特性非常复杂。利用准稳态的方法,联立潜孔锤气室气体流量方程、状态方程和等熵方程建立了气室气体状态数学模型。并利用差分方法在Visual C++中编制了气体压力程序,应用动态链接库技术实现其与多体动力学程序ADAMS/View的链接,生成了活塞驱动力用户子程序,在ADAMS中建立了潜孔锤虚拟样机模型,分析了活塞的运动过程及不同工作气室的压力变化。仿真结果与实验数据进行了对比,验证了潜孔锤虚拟样机的正确性,对潜孔锤的优化设计具有指导意义。

Pneumatic Down-the-Hole （DTH） hammer is a percussive rock drilling equipment. The dynamics of DTH hammer system is very complex for its high non-linear behavior. Based on quasi-stable state method, gas state mathematical model of air chambers was established with the flow equation, state equation and isentropic equations. Program of gas pressure was written in Hsual C ＋ ＋ with the differential methods. The user-written subroutine of piston driving force was generated as link of C＋ ＋ program with ADAMS/View realized with dynamic link libranry, and DTH hammer virtual prototype was finally built in ADAMS. According to the DTH hammer virtual prototype model piston motion and pressures of different air chambers were analyzed. The simulation results obtained from the virtual prototype model of DHT hammer system agree very well with the data from the experimental tests. The simulation method provides valuable preferences for design and analysis of the pneumatic hammer tools.