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WS24 - maximum allowable temperature a Determine the ratio...

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MANE-4030: Elements of Mechanical Design: Worksheet #24 12/3/07: Topic: Brakes A differential band brake is to be used on a horse-drawn cart as shown in the sketch below. The cart with driver and passenger is expected to have a mass of 280 kg. A horse going at a good pace goes roughly 6 m/s. Woven cotton is selected as the brake lining material. In an emergency, the cart must be able to stop within 450° rotation of the wheel (to which the brake drum is attached). Neglect the force of the horse (assume the brake is to assist the horse by removing the inertial load of the cart). In this problem you are to determine the required actuating force, the required band width to avoid exceeding the maximum allowable pressure, and the required rim mass to avoid exceeding the
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Unformatted text preview: maximum allowable temperature. a) Determine the ratio of band forces for the given brake lining material and geometry. Check that the brake design is not self-locking. b) Determine the required braking torque to achieve the stopping distance by balancing the kinetic energy with the brake dissipation energy. c) Solve for the band forces, then using the geometry, solve for the required actuating force. d) Solve for the minimum band width to avoid exceeding the maximum allowable pressure. e) Based on the dissipation energy found in part (d), find the minimum rim mass (assume cast iron) to avoid exceeding the maximum allowable temperature. F a...
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