Cushion Performance Analysis And Experimental Research Of High-speed Pneumatic Cylinder

Pneumatics is a technology which passes the signal and power to achieve mechanizationand automation by compressed gas as the working fluid. As a more efficient and cleaner drivetechnology, it is widely applied in the field of production, especially in the industrialautomation. Pneumatics is developing to high-precision, high speed, high density andintegrated direction increasingly. As the most widely used implementation components inpneumatic systems, pneumatic cylinders is developing toward high speed, which is of greatsignificance to enhance the production efficiency. The high-speed process of pneumaticcylinder needs to solve the problem of buffer. Due to the gas inherent property ofcompressibility and high flexibility and load inertia and so on, if we require swift positioningand reversing of the cylinder. The cylinder with high-speed movement will produce strongvibration and shock, and impair swift positioning accuracy and life time of the cylinder, andsevere cases will damage the cylinder cover and the equipment. So it is particularly importantfor us to study on cushioning performance of the high-speed cylinder and improve theperformance and life time of it through optimization approaches.The thesis proposes the research threads and contents of the subject on the basis ofsumming up the structures, the cushion forms and the review of the previous work of thehigh-speed cylinder, the cushion performance and dynamic changes were researched in detail,through theoretical analysis, mathematical modeling, numerical simulation and experimentaltest.First, the thesis establishes a mathematical model for high-speed cylinder and simulatesthe cushion process of the stretching motion of the high-speed cylinder’s piston through theSimulink software. On the basis of this, the thesis analyzes the trends of dynamic parametersof cylinder cushion process, as well as changes of the parameters impact on dynamicperformance under variable conditions. Comparing simulation results with experimentaldatum shows that the simulation curve and trends in the actual movement of cylinder arebasically the same. Then, the thesis makes a test scenario for cushioning performance of high-speed cylinder,designs a test platform for cushion characteristics of the cylinder and establishes acomputer-assisted testing system. Completed the installation and debugging of mechanicalstructure, pneumatic circuit and corresponding sensors. Using the LabVIEW programmingsoftware, the thesis completes the interface design and coding of the test program, whichmakes it possible for data collection and the controlling of a solenoid valve.Finally, the thesis makes a test of dynamic parameters of the cushion process forhigh-speed cylinder, and a validation of theoretical research and simulation analysis forcushion performance of cylinder. Through analyzing test datum, variation laws of cushionprocess parameters are summarized. The thesis provides a research foundation for finding andbuilding relationship models of the best cushion and working conditions, and provides areference for parameter optimization of cushion structure of the cylinder.In summary, the thesis studies a specific architecture for cushioning performance ofhigh-speed cylinder by theoretical analysis and experimental design, and offers a theoreticbasis and experimental references for structural improvements and performance optimizationsof high-speed cylinder.