DieselShip's Online Content Library

Q4. For one cylinder of a vertical diesel engine, the mass of the piston and other reciprocating parts is 40 kg. The engine stroke is 400 mm and the engine speed is 480 rev/min. The motion of the piston may be assumed to be simple harmonic. Calculate EACH of the following:

(a) The maximum velocity of the piston;

(b) The velocity of the piston when it is 50 mm from top dead center and travelling downwards;

(c) The piston rod force, in both magnitude and direction, acting on the piston at the position given in part (b) if the gas force above the piston is 25 kN at this instant. Assume the piston rod is vertical.