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TM 140: Torsional Vibration Apparatus

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Torsional Vibration Apparatus

Torsional Vibration Apparatus Torsional Vibration Apparatus Torsional Vibration Apparatus

Product Details

Technical Description 
This table unit is used to explain torsion and torsional vibration in experiments. Demonstrations and student experiments are both foreseen in equal measures. The core of the experiment is a metal torsion bar. With the aid of chucks, mass discs of varying inertia can be attached to the bar. It this way it is possible to assemble torsional vibrator systems with up to three masses. Vibrations can be induced on the system using an electrical exciter supplied from the control unit. An adjustable damper can be used to influence the vibrations. Shaft encoders on the chucks provide the amplitude of vibration as an electrical signal. The control unit conditions these signals and makes them available, e.g., for display on an oscilloscope (which must be provided) or on the PC data acquisition system TM 140.20 (available as an accessory).  
Learning Objectives / Experiments

- Determination of the torsional stiffness of a torsion
- Determination of the mass moment of inertia
- Decay behaviour of torsional vibration
- Determination of the damping of torsional vibration
- Forced torsional vibration, resonance
- Torsional vibration systems with several weights,
  two mass torsional vibrator, three mass torsional
* Versatile table experiment system on torsional
  stiffness and torsional vibration1
* Behaviour of two and three masses torsional
* PC data acquisition TM 140.20 available


[1] Unit for investigating torsional vibration and torsional stiffness in demonstrations and student experiments
[2] Base frame made of aluminium with rubber feet
[3] Steel torsion bar, corrosion-resistant
[4] Mass discs D=150mm and D=228mm
[5] 4 ball bearing mounted bearing units with chucks and 3 hole flange, the bearing units can be positioned as required
[6] Sealed oil damper 0.25...3.5Nm/rad/s
[7] Exciter with drive crank, excitation amplitudes 1.4°, 1.8°, 2.4°
[8] 4 electr. shaft encoders, 0.03V/°
[9] Electron. exciter control unit with digital frequency display, 10-turn potentiometer and supply for the shaft encoders
[10] lxwxh 1400x410x400mm

Technical Data

Torsion test bar
-  1300mm
- D=6mm
corrosion-resistant steel
Stiffness: approx. 1.0Nm/rad/m
- D=150mm, approx. 2.7kg
- D=228mm, approx. 4.8kg
Exciter frequency: 1...20Hz
Damping coefficient: 0.25...3.5 Nm/rad/s
Dimensions and Weight
l x w x h : 1400 x 410 x 400 mm
Weight : approx. 55 kg


230V, ~50Hz

Scope of Delivery

1 base frame
4 bearing units
1 torsion bar
3 mass discs
1 exciter
1 rotary damper
1 control unit
1 instruction manual

Order Details

040.14000  TM 140  Torsional Vibration Apparatus

Available accessories

TM 140.20 -- PC Data Acquisition System
Alternative products
TM 150.02 -- Free and Damped Torsional Vibrations
TM 163 -- Torsional Vibration Apparatus
TM 164 -- Vibration of Spiral Spring Apparatus
TM 610 -- Inertia in Rotational Motion Apparatus
TM 612 -- Flywheel Apparatus

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
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