This unit is designed to determine the time period and frequency of a cantilever beam. When a force acts on a vibrating body in such a way that it makes the body to keep vibrating at constant speed, it is called forced vibration whereas if a body vibrates freely without any external force acting on it, it is termed as free vibration.
The unit consists of a horizontal metallic beam which is pivoted on one side of frame and is free at other end. To suspend it in horizontal position, it is connected to the upper side of frame via a spring. The unit contains two exciters.
1. Linear exciter/Balanced exciter
2. Non-linear exciter/Unbalanced exciter