Constrained Motion: Definition, Types [PDF]

What is a Constrained Motion?

Constrained Motion is defined as a mechanical pair which is having definite motion with respect to another element.

Types of Constrained Motion:

There are three types of Constrained Motion:

1. Completely constrained
2. Partially or Successfully constrained motion and
3. Incompletely constrained motion

1. Completely Constrained Motion:

Completely Constrained Motion is defined as the motion between the pair that takes place in a definite direction irrespective of the direction of the force applied, Therefore it is known as Completely Constrained motion.

Example:

• Square bar in a square hole
• Shaft with a collar at each end in the circular hole.
• A piston in the cylinder of an IC engine.

2. Partially or Successfully constrained motion:

In a partially or successfully constrained motion, the motion between a pair is not completed by itself but by some other means. Let’s understand by an example

Example: The motion of the shaft in a footstep bearing becomes successfully constrained motion when a compressive load is applied.

3. Incompletely constrained motion:

The motion between a pair takes place in more than one direction.

Example: Circular shaft in a circular hole, as it may either rotate or slide in a hole. Both motions have no relationship with other.

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