This paper presents a reliability optimization design method for a hydraulic system that considers oil contamination. The proposed method applies the quantitative relationship between oil contamination and system reliability to the reliability design of a hydraulic system, while considering the performance, layout, and other design factors. A global reliability model of the hydraulic system is constructed based on the oil contamination control model. Further studies aiming at an optimization design model of the hydraulic system is established where the cost is the objective function, reliability index, size and structure range, performance requirements are constraints, structure size and oil change period are design variables. For illustration, a case study on the reliability optimization design of the oil supply point branch of the static pressure bracket of a certain type of heavy CNC horizontal lathe is considered.

本文提出了一种考虑油污的液压系统可靠性优化设计方法。所提出的方法将油污染和系统可靠性之间的定量关系应用于液压系统的可靠性设计中，同时考虑到性能，布局和其他设计因素。基于油污控制模型，建立了液压系统的整体可靠性模型。建立了针对液压系统优化设计模型的进一步研究，其中成本为目标函数，可靠性指标，尺寸和结构范围，性能要求为约束条件，结构尺寸和换油周期为设计变量。为了说明，