Which of the following displacement diagram is chosen for better dynamic performance of a cam follower mechanism? 

Explanation:

Cycloidal motion: 

• cycloidal motion curve has the best dynamic characteristics.
• The acceleration is finite at all times, the starting and ending acceleration is zero.
• It will yield a cam mechanism with the lowest vibration, stress, noise and shock characteristics. Hence for the high-speed engine, the cam follower should move with Cycloidal motion.

Additional Information

Simple Harmonic Motion: Since the follower moves with a simple harmonic motion, therefore velocity diagram consists of a sine curve and the acceleration diagram is a cosine curve.

• velocity of the follower is zero at the beginning and at the end of its stroke and increases gradually to a maximum at mid-stroke.
• acceleration of the follower is maximum at the beginning and at the ends of the stroke and diminishes to zero at mid-stroke

Uniform Acceleration and Retardation: The round corners of the displacement diagram are usually parabolic curves because the parabolic motion results in a very low acceleration of the follower for a given stroke and cam speed

Uniform velocity motion: