A disc brake system slows down or brings vehicles to a complete halt by transforming kinetic energy into heat energy which is then dissipated into the surroundings, generating sound and other energy losses components. Discuss how you would conduct stress analysis of this disc brake system under the following analysis types: i) Thermal. 11) Static structural
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- The tyre of a parked car in a parking lot experiences Select one: O Siding Friction O Rolling Friction Both static and dynamic friction O Static FrictionH.W LEC 14 .pdf H.W LECTURE 14 1) A vehicle with mass of 1900 kg traveled with speed of 78 km/h on a level road surface, the coefficient of friction 0.88 find the maximum braking efficiency possible under these conditions, acceleration and stopping distance if all wheels of the vehicle are braked. 2) The brakes of a vehicle were found to be only 90% efficient. Find the stopping distance from 65 km/h, and the acceleration. if all wheels of the vehicle are braked IIDisadvantages and advantages of mechanical power from animal power
- Choose the best answer and explain it An engineer wants to design an improved elevator for a building. The original design used a motor that could lift 1000 kg through a distance of 20 meters in 30 seconds. The engineer wants a motor that can lift 800 kg through a distance of 30 meters in 20 seconds. Compared to the old motor, the new motor __________. Explain your answer. (A) Should exert a force of the same magnitude, but must provide larger power output (B) Should exert a force of a larger magnitude, and must provide a larger power output (C) Can exert a force of a smaller magnitude, and can provide a smaller power output (D) Can exert a force of a smaller magnitude, but must provide the same power output (E) Can exert a force of a smaller magnitude, but must provide a larger power output.b) If all axles must be operational for the vehicle to function and the reliabilities are measured over a 100-day mission, calculate the MTTF of the vehicle assuming a constant failure rate for each tire. • MTTF = 80 d • MTTF = 183 d • MTTF = 128 d • MTTF = 100d11. Bicycle tires for street racing are very narrow. Why aren't they made wider if the bicycle needs to have a large amount of friction to grip the road during the race? (Your answer must relate to friction, but you may add other ideas as well.)
- The following data refers to a laboratory experiment with rope break. Diameter of the flywheel = 1 m, Diameter of rope = 12 mm, Dead weight on the brake = 55 kg, Speed of the engine = 200 rpm, spring balance reading = 130 N. Find the brake power of the engine. %3D %3D1. A vehicle with a wheel diameter of 1.3 m develops a drawback pull of 14.8 kN while at a speed of 15 km/h. the combined efficiency of the differential transmission is 80% and the overall reduction is 25 to 1. Calculate: a) The power delivered by the engine b) Torque delivered by the clutch c) Axial force in the clutch needed to transfer power. There are three pairs of friction surface and a 0.28 coefficient of friction. The outside diameter and face of the clutch are 320 mm and 30 mm, respectively. d) Maximum pressure on the clutchThese are material used for lining of friction surfaces of a clutch should have the followingcharacteristics: 1.It should have a high and uniform coefficient of friction.2. It should not be affected by moisture and oil.3. It should have the ability to withstand high temperatures caused by slippage.4. It should have high heat conductivity.5. It should have high resistance to wear and scoring. Can you explain why these characterictic are important?