Squeak and Rattle : test bench
![cevaa-moyen-Banc essai squeak and rattle banc essai squeak and rattle acoustique](https://cevaa.com/wp-content/uploads/2021/01/cevaa-moyen-Banc-essai-squeak-and-rattle.jpg)
Two means are available at CEVAA:
Method 1 : impact noises
A steel rod is dropped vertically on a bell-shaped aluminum plate. The noise measurements are carried out without samples, then with a sample on the rod at the level of the impact zone. The whole is placed in a quiet environment (semi-anechoic chamber or squeak and rattle chamber).
![cevaa-moyen-Banc essai squeak and rattle - bruit impact bruit impact](https://cevaa.com/wp-content/uploads/2021/01/cevaa-moyen-Banc-essai-squeak-and-rattle-bruit-impact.png)
The average attenuation level generated by the sample (Natt in dB(A)) is the difference between the two calculated levels:
Natt = Nsam – Nrod
Method 2
Claps noise
The element to be tested (cable or wire harness) is placed on a steel plate excited at 9 Hz (displacement of +/- 5 mm). A microphone is placed 150 mm from the steel plate.
![cevaa-moyen-Banc essai squeak and rattle - bruit claquement bruit claquement](https://cevaa.com/wp-content/uploads/2021/01/cevaa-moyen-Banc-essai-squeak-and-rattle-bruit-claquement.png)
Frictions noise
The element to be tested (cable or bundle of cables) is placed on a steel plate, it is excited according to the same profile used for the claping noise.
![cevaa-moyen-Banc essai squeak and rattle - bruit frottement bruit frottement](https://cevaa.com/wp-content/uploads/2021/01/cevaa-moyen-Banc-essai-squeak-and-rattle-bruit-frottement.png)
Measurements / calculations made
The average attenuation level generated by the sample (Natt in dB(A)) is the difference between the two calculated levels:
Natt = Nsample – Nrod
Examples of completed projects
Innovative materials characterization
Reference procedure
- Standard SAE J2192 revised 2016-06 “Recommended testing methods for physical protection of wiring harnesses”
- Standard Renault 16-00-001 -L dated 03/31/2017 “Protective Tape for harness”
- BMW Standard GS 95008—3 revised 2005-10 “Adhesive tapes for wiring harnesses in motor vehicles”
Materials characterization benches
For more information, contact us to discuss technically on your needs!