MaGyc's Sound Test

FRF Analysis

FRF Analysis: a quick and relatively inexpensive way to detect the presence of defects (flaws). The analysis based on the vibrational characteristics of the product concerned is used to detect flaws like cracks, porosities, incorrect heat treatment, machining errors in many different types of products and components.

The most evident advantages of the application of this technique:

  • The cost is significantly lower compared to other control techniques;
  • The test time may be as short as 0,5 sec.;
  • It can be applied at the end of the production line..

How does the FRF Analysis work?

  • The piece is excited to vibrate by dropping or impact;
  • A microphone captures the sound;
  • Learning with an adequate number of good pieces, a unique signature is generated;
  • A piece not good reveals deviations from the signature of the good one.

NDT Control techniques based on the FRF Analysis have been successfully Applied to:

  • Flaw detection in sintered parts even at the green state;
  • Control of brake pads and brake disks integrity;
  • Checking integrity of cast parts;
  • Control of welds integrity;
  • Checking integrity of refractory products and ceramics.


  • analysis for squeal reduction;
  • detection of voids, cracks, debonding;
  • geometry or density variations;
  • different material characteristics;
  • manufacturing process deviations.