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Free And Forced Vibrations
Free And Forced Vibrations (Product Code: SLE/ETM/13) is a beam vibration apparatus used to study free, forced and damped oscillations in engineering and theory of machines laboratories. Students can set the beam vibrating by hand or force it with a variable-speed servomotor driving a rotating offset mass, while a non-contacting sensor records displacement without adding damping. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Beam | High-grade ground steel |
| Pivots | High-quality ball races for lowest friction and incidental damping |
| Excitation | Manual, or a variable-speed servomotor driving a rotating offset mass (‘exciter’) |
| Speed control | Servomotor with its own encoder and advanced controller for accurate speed regulation |
| Exciter position | Encoder linked to the rotating exciter mass measures its dynamic position |
| Displacement sensing | Non-contacting sensor with no physical contact with the oscillating system |
| Acceleration sensing | Accelerometer built into the exciter assembly |
| Damping | Variable-area viscous dashpot damper, with non-toxic fluid of stable viscosity (supplied) |
| Set-up | Simple and quick set-up and changeover; designed for repeatable results over a range of ambient temperatures |
| Analysis | Software compares measured acceleration with that derived from displacement |
| Product code | SLE/ETM/13 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Free And Forced Vibrations Apparatus Used For?
Engines, pumps and building floors all vibrate, and engineers need to know the natural frequency of a structure and how strongly it responds when something drives it near that frequency. With this apparatus, a class first plucks the beam by hand to watch free vibration die away, then switches on the exciter and raises the servomotor speed step by step to trace the forced response and find resonance.
Fitting the dashpot and changing its open area adds controlled viscous damping, so students can see how damping lowers the resonant peak. Because the displacement sensor never touches the beam and the pivots run on ball races, very little unwanted damping creeps in. The accelerometer in the exciter shows the phase between displacement and acceleration — a strong SHM and vibration practical for mechanics lab equipment in India.
What to Specify When Ordering
- The computer arrangement for the software — ask us what the software runs on.
- Your mains supply, so the servomotor controller arrangement can be confirmed.
- Whether you need extra dashpot fluid with the order.
- The number of units for your vibration laboratory.
OEM Manufacturer
Jain Scientific Equipments Private Limited, which sells under the ScienceLab name, is the OEM for the Free And Forced Vibrations apparatus and produces it at its own licensed factory at Saha, Ambala, Haryana, India. Engineering colleges and dealers deal with the maker itself for quotations, repeat orders and parts such as the dashpot or sensors — ask us.
Read about the company on the ScienceLab profile.
Related Theory of Machines Equipment
Other vibration apparatus for building a complete practical set:
- Free and Forced Vibration Apparatus — a separate ScienceLab model to compare when choosing equipment.
- Free Vibrations Of A Cantilever — free vibration of a cantilever beam.
- Damper Kit — for further damping experiments.
- Whirling of Shaft Apparatus — resonance of rotating shafts.
All models are listed in the Theory of Machines category.
Frequently Asked Questions
How are vibrations produced on the Free And Forced Vibrations apparatus?
On the Free And Forced Vibrations apparatus, students may vibrate the system manually for free vibration, or force it using a variable-speed servomotor driving a rotating offset mass. The servomotor has its own encoder and controller for accurate speed regulation.
Why is a non-contacting displacement sensor used?
The Free And Forced Vibrations apparatus SLE/ETM/13 measures beam displacement with a non-contacting sensor, so the sensor has no physical contact with the oscillating system. That keeps added damping negligible and the measured response closer to the true behaviour of the beam.
What does the accelerometer show?
The accelerometer built into the exciter assembly of the Free And Forced Vibrations apparatus shows the phase relationship between beam displacement and acceleration. The software also compares measured acceleration with acceleration derived from the displacement readings.
Is damping included?
Yes. The Free And Forced Vibrations apparatus includes a variable-area viscous dashpot damper for use with a non-toxic fluid of stable viscosity, and the fluid is supplied. Changing the damper area lets students compare different levels of damping.
Who manufactures the Free And Forced Vibrations apparatus?
Jain Scientific Equipments Pvt Ltd (ScienceLab) is the OEM manufacturer of the Free And Forced Vibrations apparatus SLE/ETM/13, producing it at its own licensed factory in Saha, Ambala, Haryana, India, and selling it direct.
What computer does the software need?
The Free And Forced Vibrations listing refers to software for comparing acceleration with displacement but does not state its computer requirements. Ask us through the contact page, and include your preferred set-up when you request a quotation.
Request a Quote
Request a quotation for the Free And Forced Vibrations apparatus (SLE/ETM/13) on the contact page or add it to your enquiry cart. The manufacturer answers directly, for Indian and export orders alike.
Last updated: 24 September 2026
