Free and Forced Vibrations
Product Code : EL-TOMP-11416
Quick Answer: Free and Forced Vibrations is a bench-top unit that shows free and forced vibration of two mass-beam systems: a rigid beam on a pivot and spring, and a flexible pinned-pinned beam. A servomotor turning an offset mass forms the exciter for forced vibration.
Last updated: October 2026
Key Features
- Rigid beam with a pivot at one end and a spring at the other
- Flexible pinned-pinned beam with a pivot at one end and a roller pivot at the other
- Variable speed servomotor with its own encoder and controller drives a rotating offset mass
- Non-contacting sensor measures beam displacement with negligible damping
- Accelerometer in the exciter assembly shows the phase between displacement and acceleration
- Ground steel beam, ball race pivots and a rigid, heavy steel frame
Technical Specifications
| Specification | Value |
|---|---|
| Systems | Rigid beam with spring; flexible pinned-pinned beam |
| Exciter | Variable speed servomotor with rotating offset mass |
| Speed control | Servomotor encoder and controller |
| Sensors | Non-contacting displacement sensor; accelerometer in exciter |
| Frame | Rigid, heavy steel |
About This Product
Students first let each beam vibrate freely to find its natural frequency, then drive it with the exciter across a range of speeds to watch the response build up near resonance. In the spring system the spring gives the elasticity, while in the pinned-pinned beam the beam itself does, so the two can be compared. Educational Instrument can arrange export supply of the Free and Forced Vibrations to United Kingdom, Barbados, Belize, Mali and Uzbekistan.
Frequently Asked Questions
How are forced vibrations produced?
A variable speed servomotor drives a rotating offset mass, forming an exciter. The servomotor has its own encoder and controller to regulate speed.
Related: Theory of Machines Products, Free Vibration of Beam Spring, Universal Vibrations Apparatus and Free Vibrations of Cantilever.
For a quotation on the Free and Forced Vibrations, contact Educational Instrument.
