Strength Of Materials
1. For the engine you identified in the previous homework, calculate the following:
(a) Mean piston speed at maximum torque and at maximum power. Compare this with the typical values discussed in class. If it is outside the typical range,explain why this may still be correct.
(b) Brake mean effective pressure (bmep) at maximum torque. Compare this with the typical values discussed in class. If it is outside the typical range, explain why this may still be correct.
(c) Find or assume a reasonable size for the connecting rod in this engine.Plot V(crank angle)/Vmax as a function of crank angle and compare this with a simple sinusoidal variation in cylinder volume.
(e) Air-standard cycle efficiency calculated from the formulas deri ved in class and the arbitrary engine efficiency associated with part (d).
(d) Brake specific fuel consumption (bsfc) at maximum power assuming an air/fuel ratio of 15:1 (spark ignition) or 25:1 (compression ignition), a volumetrice fficiency of 100%, and a calorific value of 42 MJ/kg for the fuel. If you are studying a turbo, make a reasonable guess at the boost pressure when computing the intake density. Compare your bsfc with the typical values discussed in class.
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