Question:
A simple band brake shown in figure 2 is applied to a shaft carrying a flywheel of mass 250 kg and of radius of gyration 300 mm. The shaft speed is 200 rpm. The drum diameter is 200 mm and the coefficient of friction is 0.25. The dimensions a and l are 100 mm and 280 mm respectively and the angle β = 135o. Determine
(i) the brake torque when a force of 120 N is applied at the lever end.
(ii) the number of turns of the flywheel before it comes to rest.
(iii) the time taken by flywheel to come to rest.
Answer:
A simple band brake drum:
