Anechoic Chamber Motion Platform System Research And Design

In this paper we take "the moving platform of the microwave dark-room" as the studied object. We realize the function of the system by designing the mechanic structure, control system and communication system. At the same time, we practiced the related theories.At the aspect of the mechanic structure, we have designed the simple mechanism, which could accomplish the round movement in the special environment, and the cable collection mechanism. The conception of the simple mechanism is that the wheel's diameter of car's two sides is unequal and the car's two shafts are unparallel. The unequal wheels satisfy the velocity ratio relation of the inside and outside wheel. When the car moves along the orbit, the axis of the two unparallel shafts point to the center of the circle orbit. This mechanism makes the motion of the car smoothly. Basing on the thinking of the overhead traveling crane, we develop the cable collection mechanism which ensure the cable avoid drag, fabric and so on. The mechanism satisfies the demand of system, that is reliability, safety.The basic design idea of the control system is the DCS based on the PLC and IPC. As the principal control system, the IPC accomplishes the device's control and the whole system's management, control and supervise. As the subordinate control system, PLC receives the principal instruction and finishes the given functions. All the subsystems are concurrent and independent working. They exchange information through the up system. In this system we apply the double closed loop theory to guarantee the accuracy of position control.The redundant communication technology is used in this system. On the base of communication controller, we adopt the method, which combine the information redundancy of software redundancy and the redundancy transmission. The communication software is programmed on the platform of VC++6.0. Therefore, we can advance the reliability of serial communication. This communication method ensures system's reliability in communication and control.