Meriam, Kraige & Bolton — Plane Kinetics of Rigid Bodies: Problem 6_181

6/181 The four-bar mechanism operates in a horizontal plane. At the instant illustrated, \(\theta = 30^\circ\) and crank OA has a constant counterclockwise angular velocity of 3 rad/s. Determine the required magnitude of the couple M necessary to drive the system at this instant. Member BCD has a mass of 8 kg with a radius of gyration of 450 mm about point C. The mass of crank OA and connecting link AB may be neglected for this analysis.