VBT - Vibrating Beam Testing


The VBT system measures the Young's modulus, the shear modulus and the structural damping factor of elastic and viscoelastic materials. The method is based on the measurement of the entry mobility of a free-free beam excited in its center. It is valid for a frequency range from 10 to 5000 Hz.​

All Mecanum VBT systems come with a verification steel beam as well as a starter kit which includes glue, steel uniform beams, aluminum uniform beams and mounting screws. The VBT-X software measures the entry mobility of a free-free beam excited at its center as a function of frequency. ​A modal decomposition accompanied by a genetic algorithm makes it possible to extract the resonant modes and to determine the mechanical properties of the material.​

Like the Oberst beam (ASTM E756-05), different types of beams can be measured.


Main Advantages

  • Quality control

  • Research and development

  • Acoustic materials modelisation

  • Damping potential evaluation

  • Method inspired from ASTM E756-05 standard

  • Simple and user-friendly interface

  • Advanced calculation algorithms

  • Superior build quality

  • Automatic calculation of global statistics

  • Automatic report



  • Test bench with a stainless steel frame

  • Acquisition system with integrated amplifier

  • Set of starting beams (5 aluminum beams, 5 steel beams and 10 pairs of roots)

  • Magnetic exciter

  • Magnetic position sensor

  • Steel beam

  • Aluminum beam

  • Steel root

Measured Properties