Research On Linear Pneumatic Cylinder Dynamics And Bending Vibration

As the most important pneumatic actuator,the cylinder has a wide range of applications in various industrial automation equipment.With the diversification of the application conditions of cylinders and the continuous improvement of people’s requirements for cylinder reliability,it is more and more important to study the dynamics of cylinders for different installation methods of cylinders.By establishing a dynamic model of the cylinder and its driving mechanism,not only can you obtain various dynamic parameters such as the stress of the internal parts of the cylinder,the radial motion characteristics of the cylinder,but also optimize the design,failure mechanism and reliability of the cylinder Provide theoretical guidance.Based on the above discussion,this paper will study the structural optimization design method,swing dynamics and bending vibration dynamics of the key components of the cylinder.First,introduce the two common installation methods of the cylinder.The finite element simulation of the fixed cylinder is used to obtain the dynamic characteristics of the cylinder,which is used as the boundary condition to optimize the structure of the key parts of the cylinder and reduce the stress on the piston during the impact of the cylinder.Based on Lagrange equation,the dynamic modeling of articulated cylinder and its load is carried out.The rigid body dynamics simulation of the pneumatic mechanism is carried out in ADAMS,which is compared with the analytical results to verify.Simplify the internal contact relationship of the cylinder,find the analytical expression of the internal contact force of the cylinder and analyze the influencing factors of the contact force.For the articulated cylinder,there is the problem of bending vibration at the end of the extension stroke.A flexural vibration model was established at the end of the cylinder,and the natural frequency and vibration mode of the cylinder were solved and verified by ANSYS modal analysis.The working condition of the extended end of the cylinder is equivalent to the problem of free vibration of the simply supported step beams at both ends under the excitation of the swing speed,and the radial vibration response of the cylinder is obtained.Finally,the rigid-flexible coupling model of the pneumatic mechanism is established through simulation,and the stress variation of the cylinder during the extension process is obtained.The cylinder test platform was designed and built,and dynamic signal acquisition was performed on the cylinder to further improve the dynamic model.At the same time,the test results are compared with the analytical results to verify the correctness of the cylinder dynamics analytical model.This paper provides a theoretical reference and data basis for the optimization design,motion control,internal contact force of the cylinder and radial vibration research through the study of the dynamics of the linear cylinder.