基于工况特性分析的流体耦合因素对液压系统功率流的影响机理研究

Influence Mechanism of Fluid Coupling Factors on Hydraulic System Power Flow Based on Analysis of Working Condition Characteristics

以闭式液压系统为研究对象,利用键合图理论建立其多能域耦合模型,并结合典型工况特性,分析流体主要耦合因素变化对液压系统功率流分布规律的影响,为从功率流角度分析液压系统耦合特性和液压系统设计提供理论指导。研究表明,不同工况周期过程中,流体耦合因素的变化导致液压系统功率流传递效率的变化,通过合理选择油液体积弹性模量、油液黏度等流体耦合因素,可有效提高系统存储功率、降低损失功率,从而改善系统稳定性和工作效率。

Taking the closed hydraulic system as the research object,by using the bond graph theory to set up the multi-energy domains system model,we analyze the change of main fluid coupling factors on the influence of the hydraulic system power flow distribution in typical condition characteristics.This research can provide a theoretical guidance for the hydraulic system＇ s analysis of coupling characteristics and its design.The result shows that during different conditions of working periods,the change of fluid coupling factors can cause the transfer efficiency＇s change of the power flow of hydraulic system.In this paper,we think that selecting proper fluid coupling factors such as the oil bulk modulus and the oil viscosity can effectively improve the system storage power,reduce the power loss,and improve the system stability and efficiency.