Research on the Synchronous Control of the Pneumatic Parallel Robot with Two DOF

Basing on the structure of the pneumatic parallel robot with two degrees of freedom (DOF), this paper studies the control method of synchronous coordinated motion of two cylinders in the parallel mechanism to ensure the horizontal attitude of the end position of the parallel mechanism and the trajectory planning. Two active cylinders in the parallel mechanism cannot be controlled coordinately because of the compressibility of gas, the variety of the load force of parallel mechanism and the difference of cylinder pressure changing in the motion. The paper uses the fuzzy adaptive PID control algorithm with gravity compensation and the object-oriented coordinated method to control the motion of the active cylinder. Firstly, the pneumatic parallel mechanism in this paper is introduced. Then the paper studies on the control method when cylinders swing, which is the fuzzy adaptive PID control algorithm. In the end, two cylinder coordinated motion control method is researched based on the parallel mechanism. The synchronous motion control method lays a theoretical foundation for the study of pneumatic parallel mechanism and improves the pneumatic parallel robot technology.