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Reliability of braking systems is a key requirement to ensure the safety of in using downward belt con-veyor brakes.By analyzing and comparing three commonly used braking velocity curves,we concludethat the Harrison curve is the best.Given the characteristics of a downward belt conveyor,we studiedthe control in a closed-loop velocity,a conventional PID method and an optimal PID control method.We used MATLAB/Simulink to simulate the three control methods.Our simulation results show that opti-mal PID control is especially suitable for disc braking systems.To verify the results from theoretical anal-ysis and simulation,a multifunctional test-bed was developed to simulate the braking process of a discbrake system.Our experimental results demonstrate that the optimal PID control can make the outputvelocity to follow a preset velocity correctly with only small fluctuations,meeting the requirements ofa flexible brake for a belt conveyor.
Reliability of braking systems is a key requirement to ensure the safety of in using downward belt con-veyor brakes.By analyzing and comparing three commonly used braking velocity curves, we conclude that the Harrison curve is the best. Giving the characteristics of a downward belt conveyor , we studied the control in a closed-loop velocity, a conventional PID method and an optimal PID control method. We used MATLAB / Simulink to simulate the three control methods. Our simulation results show that opti-mal PID control is especially suitable for disc braking systems.To verify the results from theoretical anal-ysis and simulation, a multifunctional test-bed was developed to simulate the braking process of a discbrake system. Our experimental results demonstrate that the optimal PID control can make the outputvelocity to follow a preset velocity correctly with only small fluctuations, meeting the requirements of a flexible brake for a belt conveyor.