Norsonic AS

Sound instrumentation for Human vibration - Health and Safety - Noise and Vibration

Vibration is simply defined as the variation of an object about a fixed position. To properly define and quantify the physical characteristics of vibration, however, is much more complex – account must be taken of the direction, frequency and magnitude of vibration. Then, what properties should be measured? Is it appropriate to measure the displacement of the vibrating object as a measure of its amplitude, or should we instead measure velocity, or acceleration? What are the conventions for measuring direction, and is it really important?

  • Vibration explained
  • Damping
  • Vibrating Systems
  • What problems can vibration cause?

  • Human response to vibration
  • Whole body Vibration
  • Hand-Arm Vibration

The method used for measurement of vibration depends somewhat on which application is being evaluated (Human response, building, machine etc.) and which standard is being employed. For most general purposes vibration can be measured with an accelerometer, but some applications require a Geophone, which measures velocity instead. Outlined below are some typical measurement scenarios and recommended measurements solutions.

  • Car body panel, 1 axis;
  • Hand-Arm Transmitted Vibration, 3 axes;
  • Whole Body Vibration, 6 axes;

The harmful effects of vibrations imposed on man have been well known for years. People exposed to too high vibration levels may experience vision and balance disturbances and in the most severe cases your body may be injured. The white finger syndrome is a typical example.

There are several national and international standards describing human exposure to vibrations. ISO has a range of standards. It is recommended to visit the ISO site for further information and latest updates. The most important standards are:

  • General standards
  • Standards for Whole Body vibration
  • Standards for Hand Arm vibration
  • Whole Body
  • Hand Arm