Research On The Active Disturbance Rejection Control Of The Detection Test Bench Of The Oil Film Thickness For Lathe Hydrostatic Slide

As realizing the equipment of high speed,precision and stability in mechanical processing,hydrostatic slide has become the main development direction of high-speed,precision and overloaded motive mechanism in current manufacturing field.Oil film thickness is affected by load in the working process of machine tools.In order to ensure the accuracy of the guide rail,it is necessary link to maintain the stable state of oil film thickness.The detection of oil film thickness at present is mainly fixed-point detection of the size of oil film thickness,and cannot simulate the change of cutting force.The detection has no real time,and also don't have the ability to automatically detect.The detection test bench of oil film thickness for lathe hydrostatic slide was designed in this paper.It not only can real-time detect the size of oil film thickness in the machine working process,but also can simulate the change of cutting force.It has the ability to automatically detect.The primary research contents in this article include:(1)The overall design scheme of the test bench was established.The crucial meaning of the oil film thickness control of slide was elaborated.The mechanical structure of the test bench was designed.The components and working process of the structure were described,and its three-dimensional model principle diagram was established based on NX software.(2)The hydraulic control system principle diagram of the test bench was designed.The element composition and working principle of the system were analyzed in detail.The corresponding calculation and selection of components in the system were carried out.In order to verify whether the system can meet requirements,the performance of the system was checked.The simulation and analysis of the system were conducted by using AMESim software.(3)The principle diagram of electro hydraulic force servo system was established,and the pressure control scheme for hydrostatic slide was determined.The modeling of the electric hydraulic force servo control system of the test bench was finished.The Dynamic and static characteristics of the system were analyzed.The simulation and analysis of control system performance were carried out based on Matlab software.The control performance was optimized by adopting quadratic optimal control and pole assignment.(4)The active disturbance rejection control was introduced by the fast response and overshoot of PID control.The design of active disturbance rejection controller was completed through the cancellation of zero and pole,the establishment and programming of the algorithm,the user-defined module library and the creation and encapsulation of the subsystem.The active disturbance rejection optimization of the electric hydraulic force servo control system of the test bench was conducted based on the controller.The response graphs of electric hydraulic force servo control system after joining linear quadratic optimal control,pole assignment,PID control and active disturbance rejection control were observed,and their advantages and disadvantages were compared.(5)According to the design of the mechanical structure of the test bench,the manufacture and overall assembly of the test bench were completed.The operation procedures of the components of the test bench were determined.The dynamic guideway was added load by using electro hydraulic servo control system to simulate the change of machine tool cutting force in real time,and the relevant experiment of oil film thickness detection was completed.The system performance was optimized by adopting active disturbance rejection control,and the relevant detection test was completed.The experimental results showed that loading force traceability and the detection accuracy of thickness from the test bench were good,and the electric hydraulic force servo control system of the test bench after joining the active disturbance rejection control algorithm can improve the stability of oil film thickness.To real-time monitor the change of oil film thickness in this paper,the overall structure of the test bench was designed,and its manufacturing and building were completed.The whole process of machine cutting force produced was simulated by the electric hydraulic force servo control system,and the control performance of the system was optimized by using active disturbance rejection control algorithm.Simulation and experiments showed that the performance of the electric hydraulic servo control system of the test bench become superior and oil film thickness tended to be stable under the active disturbance rejection control environment.