Bowers Olson

05/14/2023 · High School

Exercise 3.1 In the band brake in Fig. 3.20 the actuating force ap- plied to the lever is 100 N . The angle of contact be- tween the band and the drum is \( 215^{\circ} \) and the coefficient of friction is 0,27 . The brake drum is fitted on a shaft with a flywheel. The mass of the components on the shaft is 500 kg and its radius of gyration is 360 mm . Before the brake is applied, the drum speed is \( 480 \mathrm{r} / \) min. Calculate: (a) the brake torque (b) the time required for the drum to come to rest if the brake is applied at \( 480 \mathrm{r} / \mathrm{min} \) (c) the number of revs that the brake drum completes from the moment that the brake is applied until the drum comes to a standstill (d) the total kinetic energy absorbed by the brake. Fig. 3.20 F F (