Torsional vibrations (TM163)

Torsional vibrations (TM163)

vibrations of different torsion bars



  • In torsional vibrations, a restoring moment is produced by the twisting of a bar in the oscillating system.
  • The restoring moment strives to return the rotating mass to the resting position.
  • The TM 163unit can be used to study torsional vibration on torsion bars with different diameters and different lengths.
  • At the top end, the torsion bars are clamped in a quick-action chuck.
  • A solid circular disk or a circular ring is fixed at the bottom end of the bar using a quick-action chuck.
  • They have the same mass and the same diameter, but different moments of inertia due to their shape.
  • The torsion bars can be quickly and easily exchanged and their length varied.
  • The oscillation period is measured.
  • The experimental unit is designed to be fixed to a wall

Technical Details:


  • torsional vibrations on different torsion bars
  • 5 aluminium torsion bars with different diameters
  • adjustable effective length of the torsion bars
  • quick-action chucks to swap components
  • generate torsional vibration via a circular disk or circular ring
  • stopwatch to measure the oscillation period
  • bracket for wall mounting

Technical Data:

  • Five torsion bars:
    • Aluminium
    • length: 1100mm
    • diameter: 2mm, 3mm, 4mm, 5mm, 6mm
  • Circular ring:
    • outer diameter: 160mm
    • inner diameter: 100mm
    • height: 31mm
    • moment of inertia: 0,01335kgm2
  • Circular disk:
    • diameter: 160mm
    • height: 19mm
    • moment of inertia: 0,0096kgm2
  • Stopwatch: 1/100s

Dimensions & Weight:

  • L x W x H: 700x200x200mm
  • Weight: approx. 12kg

Learning Objections/Experiments:

  • determine the oscillation period as a function of:
  • the length of the torsion bar
  • the diameter of the torsion bar
  • the rotating mass and its shape

Scope of Delivery:

  • 1 experimental unit
  • 1 set of instructional material

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.