The instantaneous centre of four bar linkage is defined as the point on a four bar linkage where the velocity of two adjacent links is equal and opposite to each other at any given instant.
The instantaneous centre of four bar linkage can be calculated using the concept of relative motion analysis, where the velocity vectors of two adjacent links are drawn and the point of intersection of these vectors is the instantaneous centre.
The instantaneous centre of four bar linkage is a crucial concept in the study of kinematics and dynamics of machinery. It helps in determining the direction and magnitude of velocity and acceleration of different points on the linkage, which is essential in designing and analyzing mechanical systems.
The location of the instantaneous centre affects the motion of a four bar linkage by determining the type of motion, i.e. whether it is a rotation or a translation. It also influences the velocity and acceleration of different points on the linkage, which in turn affects its overall performance.
Yes, the instantaneous centre of four bar linkage can change during motion as the velocity vectors of the adjacent links also change. This is particularly important in cases where the four bar linkage is not a perfect mechanism and there is some amount of play or clearance in the joints.