Solving for (\theta_3) and (\theta_4) (the coupler and follower angles) requires solving a , often handled via the Freudenstein equation:
[ K_1 \cos\theta_4 + K_2 \cos\theta_2 + K_3 = \cos(\theta_2 - \theta_4) ]
[ r_2 \cos\theta_2 + r_3 \cos\theta_3 = r_1 + r_4 \cos\theta_4 ] [ r_2 \sin\theta_2 + r_3 \sin\theta_3 = r_4 \sin\theta_4 ] 4 bar link calculator
Given link lengths and crank angle, output the angles of the coupler and follower, plus the coupler point position.
Breaking into (x) and (y) components for a given crank angle (\theta_2): Solving for (\theta_3) and (\theta_4) (the coupler and
Second derivatives provide angular accelerations, essential for force and inertia calculations.
Differentiating the loop equations yields angular velocities using the known input angular velocity. where (K_1, K_2, K_3) are constants derived from
where (K_1, K_2, K_3) are constants derived from link lengths. A 4-bar link calculator automates this solution, handling the two possible assembly configurations (open vs. crossed). A comprehensive 4-bar link calculator typically offers: