HVT12g Free and Forced Vibrations

HVT12 Universal Vibration Apparatus

A rectangular steel beam pivots at one end from a bracket and bearing attached to the HVT12f Vibration Frame. A spring is attached to the free end of the beam to enable the beam to vibrate. The horizontal position of the spring can be adjusted using the integral adjustment system

Beam displacement is measured using an LVDT displacement transducer from the HAC90 Tachometer. The output signal from the LVDT can be displayed using the HVT12k data Acquisition system.

The beam can vibrate freely by displacing the free end by a known amount between the two bump stops provided within the HVT12f Vibrations Frame. Alternatively the beam can be forced to vibrate using the Motor Exciter. The motor exciter has integral imbalanced masses, which when rotated excites the beam to vibrate. The speed of beam excitation is controlled using the HAC110 Speed Controller and its output monitored with the tachometer display HAC90 Tachometer. The output from the tachometer can also be fed into the HVT12k Data Acquisition System.

A set of calibrated weights are supplied to vary the weight being vibrated. These weights attach to the underside of the motor exciter or in another position along the beam.

The beam can be vibrated freely or forced. It can also vibrate with or without damping. Damping is introduced onto the beam using a set of damping discs and damping tank. The damping discs have adjustment which allows the amount of damping to be altered.

Full technical instruction manual included detailing apparatus assembly, operation, theory and example results.

Supplied as standard

  • 1 Vibrations Frame (HVT12f)
  • 1 Beam, pivot and spring (HVT12g)
  • 1 Vibration Absorber (HVT12d)
  • Data Acquisition System (HVT12k)
  • 1 Interface, complete with Power Supply, USB Lead, Master Software CD
  • 1 Tachometer (HAC90)
  • 1 Speed Controller (HAC110)
  • 1 Motor Exciter (HAC120)
  • 1 Vertical Support
  • 1 Dash pot Damper
  • 1 LVDT Sensor
  • 1 Maintenance Kit & Instruction manual


HVT12g Free and Forced Vibrations
  • To comprise of steel beam, pivoted at one end and supported by a spring at the other
  • Beam can be forced to vibrate or free to vibrate naturally
  • Beam forced to vibrate using a motor exciter with integral off centred masses
  • To include damping mechanism to apply damping to beam
  • Excitation frequency from motor exciter monitored using HAC90 Tachometer and controlled using HAC110 speed controller
  • To have LVDT transducer to monitor beam displacement from HAC90
  • To have outputs from LVDT and Tachometer available to input to HVT12k data acquisition system or storage oscilloscope
  • Instruction manual for student and lecturer provided
  • Free vibration of a beam, spring and mass system
  • Forced vibration of a beam, mass and spring system
  • Natural frequency of oscillations
  • Resonance
  • Amplitude of vibrations
  • Phase lag
  • Periodic time
  • Imbalanced mass excitation