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The Acoustic Resonance Analysis is a technique of non-destructive component testing in series production. It is a volume-oriented method and competes therefore to ultrasonic, thermographic, sound emission, radiographic, and surface oriented methods, such as eddy current test, visual examination, dye insertion and magnetic powder.

Acoustic Resonance Analysis allows to detect and analyse quality relevant component irregularities, such as cracks, cavities, differences in hardess, inhomogenities and unbalances. 

The method uses the different physical properties resonance frequency and self-oscillation of the components to gain an objective model of the condition of the test item by suitable signal analysis methods. 
  

 

For example, cracks and lateral contraction
For example, cracks and lateral contraction

 

  

Resonance frequencies and frequency window
Resonance frequencies and frequency window

For this resonance analysis we use the revolutionary Chameleon method.

The approach of the Chameleon method is that we detect suspicious components within a sequence. We consider the resonance behaviour of the components and compare it with those of the latest references.

Our approach works properly at customers producing predominantly GOOD parts and who want to recognise statistical irregularities first of all.
To fulfil exactly this requirement, we designed our setup concept:


Testing for irregularity
Testing for irregularity

Our Chameleon considers a sample sequence of series components, eliminates outliers and returns the components of the sample sequence according to the measure of their irregularity.

The manufacturer's quality control examines the irregular components for irregularities in regards of quality relevance, and adjusts the system. Additionally some few regular components are also examined to gain the reliability that manufacturing error in the components are excluded.

During production, the Chameleon self-adjusts to the current process conditions and compensates for irrelevant process variations.


The profit of the operator is that no pre-sorting of good parts and bad parts (!) is needed to adjust the test equipment. Furthermore, current updating of the borders for irregularities by irrelevant but inevitable process effects becomes obsolete. Quality assurance only post-processes irregular components.


Due to the components' physical properties, which must first be investigated, a comprehensive series of accompanying tests is needed besides the design of the component specific measurement setup and measurement regime. Only then, suitable concepts for an automatic solution by meaningful estimation of the expected testing quality can be prepared.


We deliver not only the measurement and testing equipment, but also the complete automatic equipment on demand. Typical test cycles are between 1 and 6 seconds per item under test, according to the physical properties of the measurement regime.

Successful test results were achieved in the following industries:

  • foundry
  • forge
  • sintered metal
  • steel
  • connectors
  • ceramics
  • glass  

 

For more information on CrackMaster and other products see www.medav.de -  IAS keyword.