Free and Forced Vibration Apparatus
Product Code : EL-DOMLE-10772
Free and Forced Vibration Apparatus (code EL-DOMLE-10772) is a trainer for demonstrating the fundamentals of free, damped and forced mechanical vibration on a simple bar-type oscillator mounted on an aluminium profile frame. Coil springs of 0.75, 1.5 and 3.0 N/mm, an oil-filled damper of 5-15 Ns/m and imbalance or displacement exciters running at 0-50 Hz can be placed in any position, and a mechanical drum recorder captures the vibrations.
Get a quote: use the Add To Cart enquiry button below, or send your quantity and delivery location through the contact page.
Specifications
| Parameter | Detail |
|---|---|
| Frame | Aluminium profile frame carrying the experimental set-ups |
| Oscillator | Bar-type, 700 × 25 × 12 mm (L × W × H), 1.6 kg |
| Configuration | Spring, damper and exciter can be mounted in any position |
| Coil springs | 0.75 N/mm, 1.5 N/mm and 3.0 N/mm |
| Damper | Oil hydraulic, oil-filled, damper constant 5–15 Ns/m, adjustable damping |
| Exciter types | Imbalance exciter and displacement exciter for spring base-point excitation |
| Excitation frequency | 0–50 Hz, electronically controlled; set and displayed on a control unit |
| Imbalance | 0–1000 mmg |
| Displacement exciter stroke | 20 mm |
| Drum recorder | Mechanical; feed 20 mm/s, paper width 100 mm |
| Data acquisition | Optional unit for displaying and analysing measured values on a PC |
| Experiments | Free vibrations; damped vibrations; inertia force and displacement excitation; forced vibrations; resonance; amplitude and phase response |
| Power supply | 230 V, 50 Hz, 1 phase; 230 V, 60 Hz, 1 phase; or 120 V, 60 Hz, 1 phase |
| Dimensions | 1200 × 600 × 1400 mm approx. (L × W × H) |
| Weight | 125 kg |
| Product code | EL-DOMLE-10772 |
| Manufacturer | Engineering Lab Equipment, Ambala, Haryana, India |
What Is the Free and Forced Vibration Apparatus Used For?
A vibrating system left alone after a disturbance oscillates at its natural frequency, dies away when damping is present, and, when driven by a periodic force, responds most strongly near resonance, where the excitation frequency matches the natural frequency. Students set up the bar oscillator with a chosen spring and damper, release it to record free and damped vibrations on the drum, and then drive it with the imbalance exciter (inertia force) or the displacement exciter at increasing frequencies. Plotting amplitude and phase against frequency gives the response curves and shows the difference between the two types of excitation.
What to Specify When Ordering
- Quantity — the number of trainers required.
- Data acquisition — whether the optional PC data acquisition unit is wanted.
- Power supply — 230 V 50 Hz, 230 V 60 Hz or 120 V 60 Hz, single phase.
Frequently Asked Questions
What kinds of vibration can be demonstrated?
Free, damped and forced vibrations, including inertia force and displacement excitation, resonance, and amplitude and phase response, all on a bar-type oscillator.
Which springs are supplied?
Three coil springs are supplied, rated at 0.75, 1.5 and 3.0 N/mm, and the spring can be mounted in any position along the oscillator.
How are forced vibrations excited?
An imbalance exciter of 0-1000 mmg and a displacement exciter with a 20 mm stroke provide spring base-point excitation, at frequencies of 0-50 Hz set and displayed on the control unit.
How is damping adjusted?
An oil-filled hydraulic damper gives damped vibrations with an adjustable damping level, its damper constant ranging from 5 to 15 Ns/m.
How are the vibrations recorded?
A mechanical drum recorder with 20 mm/s feed and 100 mm paper width records them, and the optional data acquisition unit shows and analyses the measured values on a PC.
How is an order for the apparatus placed?
The Add To Cart enquiry button on this page starts an order enquiry; the contact page can also be used to send the quantity and the delivery location.
OEM Manufacturer
Buyers of the Free and Forced Vibration Apparatus deal directly with its maker, Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd), whose works are at Plot No. 43, Industrial Park, Sector 2, Growth Center, Saha, District Ambala, Haryana, India. The company designs, makes and tests dynamics of machines apparatus such as governors, gyroscopes, cams and balancing machines, supplies engineering colleges, polytechnics, technical training institutes and research laboratories in India and overseas, and builds to institution-specific requirements on request. Tender details are on the Tenders/OEM page.
Related Dynamics of Machines Equipment
- Universal Vibration Apparatus — profile-frame vibration trainer with beams, springs, imbalance exciter, tunable absorber and two chart recorders.
- Whirling of Shaft Apparatus — critical speed and shaft whirl demonstrator with six steel shafts, 6000 min-1 motor and Laval disc.
- Static and Dynamic Balancing Apparatus — ball-bearing shaft with four imbalance masses and pulley weights for static and dynamic balancing.
See the full Dynamics of Machine Lab Equipment range or all Mechanical Engineering Lab Equipment.
Request a Quote
For this and other dynamics of machine lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. Quotations are given on request: send the number of trainers and whether the optional data acquisition unit is needed and your delivery location through the contact page, or add the Free and Forced Vibration Apparatus to the enquiry cart from this page.
Last updated: October 2026
