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ME125BP hmwk 3

# ME125BP hmwk 3 - reaction torque is transferred to the...

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Homework #3 ME125BP Due Wednesday, April 27 in homework box Problem 1. Reference to Figure 2.9 on page 32. Assume that the dynamometer brake produces 3 ft-lbs of torque per psi of Mean Effective Pressure. a) At what torque and speed is the engine most fuel efficient? b) At this peak efficiency point, what is the horsepower output? c) If the engine is constrained to operate on the “Operating Schedule of Ideal Transmission” shown, what is the peak horsepower output? Problem 2. Locking and non-locking differentials (see Fig. 2.10 for suspension geometry) a) For a non-locking differential, what is the effect of increasing the differential gear ratio on traction limits? b) If the front and rear suspensions are identical, how much of the drive train
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Unformatted text preview: reaction torque is transferred to the front wheels? Problem 3. Consider the drum brake of figure 3.2 and assume that it is a scale drawing of a real system. a) The inside diameter of the drum is 0.2 meter. Using a scale, find e, m and n. b) Go to www.gmpfriction.com/Client/Images/GMP_473_dry_Data_Sheet.pdf and get their dynamic coefficient of friction for the GMP 473 material. With this material and Pa = 100lbs, what is the braking torque of the brake. Problem 4. In reference to figure 3.8 on page 63 and related calculations, find the coordinates Fxmr and Fxmf corresponding to the Front and Rear Lockup point....
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