摘要
针对复杂液压系统动态特性仿真中出现的刚性问题,从基本液压元件的建模入手研究了降低系统模型刚性问题的方法。基于里兹近似法,从分布参数模型出发得到了液压管路的精确近似的集中参数模型;引入了分段的阀口流量计算公式,解决了传统紊流流量方程存在奇点的问题;采用迭代计算、模型降阶和线性化处理的方法,避免了小液压容腔和小阀芯质量引入系统模型时带来的刚性问题。
Modeling problems of hydraulic components are discussed and methods to reduce the stiff problems in dynamic simulation of complex hydraulic system are studied. A lumped parameter model of fluid transmission line is given based on the accurate approximation method of distributed parameter model and Ritz approximation method is used. A sectional flow formula is given to avoid the infinite derivative of conventional orifice flow formula. Iterated method, reduced-order and linearized methods are introduced to solve the stiff problems caused by small volume and small mass of valve joined into system differential equations.
出处
《系统仿真学报》
CAS
CSCD
2003年第4期482-485,共4页
Journal of System Simulation
