DESIGN OF DYNAMIC COMPENSATION SYSTEM FOR CORN SEEDING POSITION BASED ON FUZZY PID CONTROL AND ANALYSIS OF BENCH TEST
Aiming at the problem that the existing planters cannot accurately maintain the seeding spacing and row spacing in the field, the high-speed photography technology is used to analyze the seeding trajectory, so as to determine the key factors affecting the seeding position. First, a dynamic compensation system for maize seeding position based on fuzzy PID control was designed. In the dynamic compensation system, the biaxial angle sensor was used to detect the angle of seeding monomer, and the space rotation theory was used to calculate the offset of the seeding position. Then, the dynamic compensation of seeding position was completed by the fuzzy PID control servo electric push rod, and the response time of fuzzy PID control system was 0.035 s. When the seed spacing of maize was 30 cm, the conveyor speed was 1.67 m/s and the seed tray speed was 30 r/min. Finally, the bench test was carried out under the conditions of random disturbance signal, sinusoidal wave disturbance signal and random disturbance signal plus sinusoidal wave disturbance signal. The results showed that compared without dynamic compensation, the variation coefficient of the longitudinal grain spacing and the transverse grain spacing decreased by an average of 6.94 % and 9.16 %, respectively. In this way, this study can provide a reference for improving the stability of seeding row spacing and plant spacing.
Abstract in Chinese