液压流道局部拓扑优化与增材制造

液压阀块是液压系统的重要组成部分，降低液压阀块的压力损失对实现液压系统节能化、提高功重比意义重大。选区激光熔化(Selective Laser Melting, SLM)技术是一种增材制造(Additive Manufacturing, AM)技术，基本突破了减材、等材等传统加工方式的设计约束，结合拓扑优化方法，可大大提高液压阀块及其流道的设计自由度。以降低流道局部压力损失为研究目标，对流道局部压力损失较大的拐弯处进行拓扑优化设计，并采用SLM技术成形，优化设计后流道的压力损失明显降低。进一步探究弯管压力损失的主要影响因素——迪恩涡，定量分析了拓扑优化流道降低压力损失的原理，结果表明，拓扑优化得到的变截面流域通过改变流域的弯曲程度，使迪恩涡对压力损失的影响降到最小，从而有效降低流域内的压力损失。对增材制造液压元件及其流道的设计具有重要指导意义。

Topology Optimization and Additive Manufacturing of Local Hydraulic Flow Channel

Hydraulic valve block is an important part of integrated hydraulic system. Reducing the pressure loss of hydraulic valve block is of great significance for saving energy consumption of hydraulic system. The Additive Manufacturing technology breaks through the traditional processing method and improves the design freedom of the flow channel in the hydraulic valve block. Topology optimization method is a calculation method for finding the optimal spatial distribution of materials in the design domain. Combined with this method, topology optimization design is carried out for corners with large local pressure loss in the runner. Selective Laser Melting is used as the forming method, and the research goal is to reduce the local pressure loss. The pressure loss in the flow channel after optimization design is significantly reduced. The main influencing factor of elbow pressure loss, Dean vortices, is further explored, and the principle of reducing pressure loss by topological optimization flow channel is quantitatively analyzed. The results show that the influence of Dean vortices on pressure loss is minimized by changing the bending degree of the basin, thus reducing the pressure loss in the basin.