Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Acoustic resonance testing for nondestructive detection of forged or casted serial parts

07.06.2016

The Fraunhofer Institute for Nondestructive Testing IZFP carries out research and development activities in the field of nondestructive testing processes along the entire materials value chain. For customers in the automobile, aerospace, rail, energy, construction and agriculture industries, the institute offers a wide range of NDT expertise and technologies. At the 19th World Conference on Non-Destructive Testing, our engineers will be presenting the acoustic resonance testing (ART) - an integral nondestructive testing method that is used to inspect components and assemblies with regard to different properties or variations in quality.

Acoustic resonance testing (ART) is an integral nondestructive testing method that is used to inspect components and assemblies with regard to different properties or variations in quality by evaluating the test object’s eigenfrequencies or other parameters determined from its natural vibration behavior.


Acoustic resonance analysis

Fraunhofer IZFP/Uwe Bellhäuser

As a comparative method, ART mainly focusses on the examination of serial parts which are produced in large quantities and with low cycle times, e.g. forged or casted metallic parts. Besides the possibility for complete automation, a big advantage of ART compared to other volume-oriented methods is the fast in-line quality assessment of an entire specimen within a matter of seconds.

The principle of ART is based on the fact that a specimen’s natural vibration behavior and its eigenfrequencies mainly depend on geometry and material properties, but also on structural defects, e.g. cracks.

One objective of ART is to detect defective parts by evaluating the test object’s measured eigenfrequencies. Generally, the exact geometric dimensions and the exact material properties of single parts in a serial production vary randomly within acceptable ranges, for example because of manufacture-related effects, entailing variations in the eigenfrequencies of the good parts.

These effects are superposed by changes in the eigenfrequencies caused by intolerable component variations. This impedes a reliable classification of the components with the help of ART. To solve this problem a new compensation method of those random perturbations respectively a method to differ between eigenfrequency shifts caused by acceptable as well as intolerable variations is required.

A current research project focusses on detecting forged or casted metallic parts with intolerable geometric variations by evaluating the component’s eigenfrequencies, whereat such parts are also characterized by large acceptable component variations.

Previous investigations using simulated data showed that the exact dimensions of components can be estimated from their eigenfrequencies after describing those correlations with the help of linear regression analyses. This contribution presents the latest results of the project, especially the adjustment of this procedure to real parts and the associated difficulties.

Weitere Informationen:

http://www.izfp.fraunhofer.de

Sabine Poitevin-Burbes | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

More articles from Materials Sciences:

nachricht Glass's off-kilter harmonies
18.01.2017 | University of Texas at Austin, Texas Advanced Computing Center

nachricht Explaining how 2-D materials break at the atomic level
18.01.2017 | Institute for Basic Science

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland

19.01.2017 | Earth Sciences

Not of Divided Mind

19.01.2017 | Life Sciences

Molecule flash mob

19.01.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>