液压球阀磨损可靠性分析

Wear reliability analysis of hydraulic ball valve

液压阀是液压系统的核心元件,以常见的球阀为例,对其进行受力分析.基于Archard磨损计算公式和球阀几何关系求得球阀磨损深度函数,根据一次二阶矩设计验算点法,构造了液压球阀多参数状态函数;基于Matlab编程求得液压球阀的磨损可靠度和设计验算点,分析了球阀管道内径、压力、弹簧预紧力、材料硬度变化对其可靠度的影响.结果表明:可靠度设计点法计算值与蒙特卡洛仿真值接近,说明球阀磨损线性函数可信;球阀各参数对磨损可靠度不是简单的单调线性关系,各参数在一定区间范围内球阀可靠度较高.上述工作为液压球阀的前期优化设计和后期工作参数的选择提供了理论参考.

Hydraulic valve is the core control component of hydraulic system.Taking the common ball valve as an example,the analysis of the stress is made,and wear depth of ball valve is get based on Archard wear calculation formula and ball valve geometry,and the multi parameter state function of hydraulic ball valve is constructed based on the first-order second-moment(FOSM)of the design point method,and the wear reliability and design points of hydraulic ball valves are obtained based on Matlab programming.The influence of the inner diameter of the ball valve,pressure,spring preload,material hardness change on the reliability of the ball valve is analyzed.The results show that the calculation value of reliability based on design point method is close to that of Monte Carlo simulation,which shows that the wear state function of ball valve is reliable;the relationship between the parameters of ball valve and wear reliability is not simple monotonic linear,the reliability of valve is higher in a certain range of valve parameters.The above work provides theoretical reference for the previous optimization of structure design and later selection of working parameters.