Repeat Problem 1, except include a rotating counterweight on the crankshaft at an angle of 180° relative to the crank. The counterweight has a mass of 3.5 kg and a center of mass located at a distance of 0.1 m from the crankshaft axis.
Problem 1:
For the mechanism of Problem 2, determine the magnitudes and directions of all bearing forces for crank angle ϕ = 0, 45°, 90°, 135°, and 180°. Assume that the center of mass of the crank is stationary.
Problem 2:
An in-line slider-crank mechanism has a crank length of 0.1 m and a connecting-rod length of 0.5 m. The piston has a mass of 3 kg. The connecting rod has a mass of 2 kg with a center of mass located at a distance of 0.15 m from the crankpin end of the rod. Utilizing a lumped-mass approximation for the connecting rod, determine an expression for the torque required to maintain a constant crank speed of 200 rev/min. Evaluate the torque on the following crank angles ϕ: 0°, 30°, 60°. 90°, 120°, 150°, and 180°.
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