The Experimental Research of Magnetic Powder Brake Loading Characteristic in Rotary System

In order to obtain the loading characteristics of magnetic particle brake (MPB) in rotary system, the servo-motor controlling and testing experimental platform is used to research MPB loading characteristics. The key step is designing different experiments that include static loading experiment, step loading experiment, and tracking loading experiment. Based on the static experiment data, the MPB static property presents hysteresis which is described appropriately in the way of piecewise fitting. The response time in step experiment is longer in upward section than in downward section and it has no relation with the speed of MPB by lucubrating step experiment data. Phase difference is relevant to input current excitation frequency after analyzing tracking experiment data. The loading characteristic of MPB is closely relation to the MPB velocity which is proposed in rotary loading system. When the input current doesn’t change, the output torque increases along with the rotary speed increasing. Also, this paper provides reference materials for improving the loading precision, mathematics modeling, and hysteresis compensation.

Research on the Half-Real Simulating Experimental System of the Automotive Power System

In order to test the performance of the Automated Mechanical Transmission (AMT) system with low cost, a half-real simulating experimental system of the automotive power system is developed. In which, the gearbox is real part, a small inertia flywheel is used to simulate the inertia of the real automotive. So a low power motor whose torque is controlled by a transducer is adopted to simulate the engine, a low power magnetic powder brake is used to replace the high-priced dynamometer. The control software is programmed using visual basic language. Experimental results show that the performance of the AMT system could be validated effectively by this system

Simulation of Yarn Tension Control System Based on Simulink

Based on the analyses of the yarn tension and the mathematical model of the magnetic powder brake, the digital simulation of the yarn tension fuzzy control system was performed by using MATLAB Simulink. The relationship between the structure parameters and the system dynamic performance was then obtained, and the system scheme was justified.