• Determination of the torsional stiffness of a torsion bar
  • Determination of the mass moment of inertia
  • Decay behavior of torsional vibration system
  • Determination of the damping of torsional vibration
  • Understanding the resonance by forced torsional vibration
  • Torsional vibration systems with several weights, two mass torsional
  • vibrator, three mass torsional vibrator


  • Experimental unit for investigating torsional vibration and torsional stiffness
  • Frame made of Anodized Aluminum Profiled Structure
  • Stainless Steel torsion bar, corrosion-resistant
  • 3 mass discs made of Stainless Steel
  • 4 ball bearing mounted bearing units with chucks, the bearing units can be positioned any place along the length of the shaft
  • Oil damper for study the influence damping
  • Motorized exciter with drive crank, excitation amplitudes 1.4°, 1.6°, 2.4°
  • 4 angle of rotation sensors.
  • Servo Exciter control unit with digital frequency display and supply for the shaft encoders
  • Shaft encoders

This apparatus is used to explain torsion of rods and torsional vibration experiments. This apparatus allow the student to demonstrate and to perform experiments foreseen as well as to calculate the results. The main unit of this apparatus is metal torsion bars. With the aid of chucks, mass discs of varying inertia can be attached to the bars. In this way it is possible to assemble torsional vibrator systems with up to three masses. Vibrations can be induced on the system using a servo motorized exciter and 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 the data acquisition software or on an oscilloscope (optional).