Cylinder Constant Research And Development Of The Loading System

Loading test is a very important link in scientific research and manufacturingprocess. The static and dynamic force can be exerted on the load-carrying object by theloading system with excellent performance, which can assess characteristics of researchobjects objectively and authenticly. The electric loading system driven by the servo motorhas attracted more and more attention in the field of low power loading because it hasadvantages of good dynamic properties, rapid response, compact structure and convenientmaintenance.Developing a loading system with constant force driven by the AC servo motor isthe main purpose of this thesis.Dynamic constant force can be carried on all kinds ofworking linear cylinders by this system. The main research contents completed are asfollows: (1) Completing the general structure design of the loading system includingmechanical transmission and torque-force conversion equipment. A torque control modelsubsystem is set up on the basis of the control strategy of "AC servo motor +motioncontrol card"; (2) Doing the research on the servo motor through preliminary tests; (3)Building the mathematical model and transfer functions of the loading system, designingthe control software module and proposing a closed-loop control method based on PIDcontrol algorithm; (4) Doing the whole loading test to gain the main performance indexs.The result suggests that the error rate of the constant force is less than 7% and theregulating time is lower than 0.3s when the linear cylinders are loaded by the system in aload range of 30N～200N, which can meet the performance requirements.