Flow velocity fuzzy control about softness abrasive flow machining

JI Shi-ming， ZHOU Long-bing， TAN Da-peng， SHI Meng， ZHANG Wei
（Key Laboratory of Special Purpose Equipment and Advanced Processing Technology， Ministry of Education & Zhejiang Province， Zhejiang University of Technology， Hangzhou 310014， China）

Abstract： Aiming at the question that the process of softness abrasive flow machining can result in the uneven machining surface and machining quality，because of the change of viscosity，a method that through adjusting the flow velocity to improve the evenness of machining surface was put forward. Aiming at the feature about the complexity of regulation and control of softness abrasive flow velocity and altitudinal nonlinearity，a set of fuzzy control system was designed. As the fuzzy control need not to know an accurate mathematical model of the object，the control of the flow velocity of softness abrasive flow could be realized well，which can't be achieved by the traditional method of control. According to the machining features and machining experience of softness abrasive flow，a design project for reasonable membership function and control rule was put forward，which makes the design of a fuzzy controller more reasonable. The fuzzy controller and the fuzzy control system were simulated by using the fuzzy logic toolbox and simulation modules in Matlab. The results indicate that fuzzy control can adjust the flow velocity of softness abrasive flow well，and can get more satisfactory control accuracy.
Key words： softness abrasive flow machining； flow velocity； fuzzy control； fuzzy logic toolbox； Simulink simulation