Comparison of numerical effectiveness of three methods for modelling 2-way flow control valves
In simulating the dynamics of 2-way flow control valves using semi-empirical model 6 the integration of pressure in small fluid volume between the pressure compensator and control throttle causes numerical problems. The system stiffness approaches infinity as the fluid volume approaches zero. Using semi-empirical model with description of the two orifices in series 6 the integration of the pressure in the small fluid volume between the pressure compensator and the main orifice can be avoided. The drawback of this method is that this pressure is needed in dynamic equation for the pressure compensator. This again leads into numerical problems when control throttle has a small cross-section area. The method proposed in this paper uses pseudo-dynamic solver to calculate the pressures in small volumes of flow control valve as individual static solutions at each time step of the actual solver that is solving the dynamics of complete valve. The key advantage of the method is that the numerical problems caused by the small volumes are completely avoided. The superiority of pseudo-dynamic method comes from the fact that the method is freely applicable regardless of used integration routine. The present paper describes the algorithm in general level and how it applies to a 2-way flow control valve model. Results obtained with the three methods are compared.
Fluid power 2-way flow control valve Simulation Small volume Pseudo-dynamic solver Static solution
Rafael Aman Heikki Handroos
Department of Intelligent Machines, Lappeenranta University of Technology, Lappeenranta, Finland
国际会议
杭州
英文
775-779
2009-04-08（万方平台首次上网日期，不代表论文的发表时间）