Lightweight Design And Research Of Electrohydraulic Actuator Shell Based On Additive Manufacturing

As an important part of mobile equipment field,the hydraulic system occupies a very large power and weight,and is a key link to realize lightweight mobile equipment.As a joint driver of hydraulic foot robot,the electrohydraulic actuator has the advantages of large output power and good control performance,and its performance is also the key component affecting the motion performance of the robot.Therefore,the lightweight of the electrohydraulic actuator can reduce the energy consumption of the whole robot and improve its maneuvering performance and control performance.In this paper,based on the cylinder shell structure of the electrohydraulic actuator,combined with the additive manufacturing,the bionic lightweight design is carried out.With the goal of reducing the quality of the cylinder shell and improving the power density of the electrohydraulic actuator,the main research work includes:(1)The main source of the pressure loss in the flow channel of the electrohydraulic actuator are analyzed and the different forms of pressure loss are calculated theoretically;The key design parameters of the cylinder shell pipeline were determined by referring to the structure of heart and blood vessel;The force analysis of the cylinder shell is carried out,and a biological structure similar to the electrohydraulic actuator is studied.The mathematical model of cylinder shell bionic structure are established,which provided the theoretical basis for the lightweight of the cylinder shell.(2)The branch Angle and arrangement scheme of different channels are analyzed;Combined with the key parameters of the bionic structure,the branch angle and layout scheme of the pipelines were optimized by constructing different pipeline models and taking pressure loss as the evaluation index.Combined with the additive manufacturing,the optimization scheme of the cylinder shell pipeline are determined to realize the low pressure loss and lightweight design.(3)The structural parameters of cylinder shell stiffeners and the selection principle of wall thickness are analyzed;On the basis of ensuring the strength and stability of the structure,the structural parameters of the cylinder shell stiffeners are optimized;The structural parameters of cylinder shell stiffeners are determined,and the layout scheme of stiffeners are analyzed;Under the influence of stiffeners,the selection principle of safety factor of wall thickness is optimized to realize the lightweight design of cylinder shell.(4)The dynamic and static performance of the lightweight electrohydraulic actuator prototype is analyzed;Testing the cylinder shell pressure loss.The pressure loss test and power density calculation are carried out to verify the advanced design method and the reliability of the overall performance of the prototype.