A kind of decoupling mathematical model of Permanent Magnet Synchronous Motor (PMSM) in two-phase rotated coordinate is established. According to the Space Vector Pulse Width Modulation (SVPWM) control strategy and optimum parameters scheme, the three closed-loop servo control system for Automobile Gear Fatigue Test (AGFT) is designed. Rapid and accurate positioning must meet the requirement of testing gear fatigue system. Simulation results show it can achieve the goal of linearization control and the scheme mentioned is feasible and effective.

Planting requirement of Super Hybrid Rice is 2±1 seedlings per hill, so sowing seeds request seed quantity and position accuracy for super rice transplanting mechanization. Based on the physical characteristic of super rice seed’s surface that along its long axis the awns grow in all directions from glumes to the glumes tip, the rotation mechanism of rice seeds embryo to the same direction were researched. In consideration of the difference of rice seeds, the arc-shaped guided plate with high friction coefficient was proposed. Orthogonal method was used to analyze the influence of parameters on rice seeds arrangement and a set of parameters were got. Vibration seed metering device was fabricated, and its structure parameter could be adjusted conveniently. Experimental results showed that above 88% super rice seeds embryo were orienting ordered, and the seed metering device based on arc-shaped guided plate can be used in seeding pipeline.

Preliminary tests found that super-rice seeds could be oriented by rolling them down with a guided plate. The rotation of the seed around the shortest axis was found to be unstable, while rotation around another two axes was found to be stable. The purpose of the current study was to examine whether this orientation phenomenon could be explained in terms of inertial characteristics of seeds. According to the surface feature of the seeds, an ellipsoid geometrical model was made. Euler dynamical model were built to analysis the movement stability of the seeds. The effect of parameters on movement stability was analyzed by the method of numerical simulation.

A new-style pneumatic precision seed-metering device for super rice seed was proposed. This paper analyzed the working process for seed-metering device. The movement of rice seed in the “L” tube was simulated by finite element analysis software. The speed distribution, pressure distribution of air in the “L” tube and the trajectory of rice seed were solved. Results of the analyses indicated that there were partial reflux at the entrance and elbow; while the airflow moved steadily at the straight pipe. Based on the fabricated device, the motion trajectory was studied by high speed video camera. Experiment was used to analyze the effect of parameters. The results showed that the experimental trajectory was in accordance with theoretical models.