摘要
讨论了液压系统仿真中的刚性问题,指出传统阀口流量方程在压差接近零时存在无穷导数值,并导致液压回路仿真计算的困难。从提高仿真计算效率出发,引入临界压力点的概念,给出了一个经验公式来取代零压差附近的传统紊流流量公式,该公式参数易于获取且为线性,并与紊流区域的流量方程能够平滑过渡,从而建立了分段描述的阀口流量模型。实例计算表明,改进后的流量方程能够有效地保证了计算精度和解决数值计算上的困难,可应用于复杂液压系统实时仿真与控制中。
Stiff problem of hydraulic system dynamic simulation is discussed,and it points that the conventional orifice flow formula has an infinite derivative when the pressure drop is zero.This can cause computing trouble during numeri-cal simulation of hydraulic system.For the purpose of improving the computing efficiency,the conventional turbulent flow function is replaced by an empirical laminar formula based on a small number of readily available physical parameters,so a two-regime orifice flow model is given.The proposed formula has a smooth transition between laminar and turbulent regimes and does not have a singular derivative.An example is given to indicate that the modified model is well suited for accurate and trouble-free simulation.
出处
《计算机工程与应用》
CSCD
北大核心
2003年第12期209-211,共3页
Computer Engineering and Applications
基金
"高等学校骨干教师资助计划"资助
关键词
液压系统
计算机仿真
流量方程
Hydraulic System,Computer Simulation,Flow Model
