The Application Of PAC In Wind Tunnel Control System

The article summarizes the development situation of our contry's wind tunnel control system, The paper mainly discusses why the case of the control system based on PAC is better than the one based on PLC and PC ,futher more the PLC and PC system must be replaced by the PAC system, Because it is the advanced system in the application of the wind tunnel control system . It brings forward the idea of system design and its material demands of the task. The paper further discusses system's early blueprint and the collectivity frame chart of the control system, at the same time, it bring forward system solutions. To realize the system function, the hardware design is the base, It includes drive system design, it mainly analyses the deference between invert motor and general motor, It includes the motor's temperature ascend , efficiency problem, insulation intensity, the ability of freqent start and brake. At last , it does well in the resistance against interference from inverter, system design of PAC, PAC acts as the core of the control system , By human-machine interface it receive the order from the operator, it would implement the order,include wind speed set and the currency zero control of AC service drive system. AC service drive system has A, B,Z pulse, the A, B pulse symbles the operation direct of the service motor, the Z pulse is the circle pulse, when the service motor arrives electrical zero field , the light-electric switch gives high signal,the high signal and the Z pulse is the currency zero. On the other hand, the way of control mainly includes two sort of wind speed control method, the first one is the control technology based on PID, second one is the control technology based on least square method. otherwise it introduces data filter methods. By lots of the experiment we obtain the parameter of the PID system. By the sample data we decide the parameter of the LS system. The paper bring forward feasible mothod to solve the problem. At last, we carry out the control system selftest and the stream field measure of the wind tunnel, check its function. The measure item includes wind speed, active press stablity, airflow bearing, the asymmetry of the stream field, and the noises arround the wind tunnel, lots of the experiments testified the function of the contol system is stable, and the currency of the system is perfect. The end gives the conclusion.