Papers by Author: Hua Lu

Abstract: Winding molding is a commonly-used molding method for composite fiber materials. In this method, the fiber winding tension control is a key technique in fiber winding since the winding tension directly affects the quality of winded products. Here designed is a closed-loop tension control system, equipped with the PLC as the main controller, the industrial control computer as the upper-host, the alternating numeric servo-electromotor and air cylinder as the actuators, and with the angle sensor of real time feedback filament tension change is designed. Presented below is Fuzzy-PID control algorithm, which combines the advantages of PID and fuzzy control by adopting the theory of adapt fuzzy control in big error range and adapt PID control in small error range. Experimental results prove that the principle of the design scheme is right with tension deviation less than 4 pers, response time about 0.4s and thus meeting the requirements of the system well.

Abstract: As an important factor in composite fiber winding, fiber winding tension influences the product quality directly, and therefore tension control is a key technique in fiber winding techniques. This paper introduces a closed loop tension control system with the PIC single chip computer as the kernel, a function module with TLC5615 D/A converter as the output, AC servomotors as the actuator, and a radius-following arm to measure the real time radius of the scroll. The mechanism of the tension control system is analyzed and the mathematical model is set up. Then the paper expatiates the design of main control circuit, the voltage transformation circuit and the analogy filter circuit. In addition, the paper presents digital filter and control algorithm of the PIC software. The system is proved to have high control precision and rapid time response through performance experiments of the tension control system in different working states, which well meets the anticipated design requirements.