Squeak and Rattle Noise
The study of noise is carried out by the CEVAA for manufacturers in order to understand acoustic phenomena and optimize systems.
Interference noise is noise perceptible by customers, of a random nature, generated by external stresses (road profile, running on rails, jet engines, etc.).
Interference noise consists of sound emissions created:
- At the level of the contact surface of two parts during relative movements (squealing, grinding),
- By deformation of parts with unsuitable tolerances and coming into contact (crackling, rattling, etc.).
Acoustic tests and measurements
The test performed is noise detection on a bench, including (according to specifications), climatic + vibration ageing based on the following best practices:
- Background noise measurement
- Listening anew (subjective “human ear” listening) + rating of levels in dB(A) / sones
- Climatic and vibratory ageing
- Listening after ageing (subjective “human ear” listening) + rating of dB(A)/sones levels
The bench must have a background noise low enough to detect parasitic noise.
The measurements taken must be subject to a rating grid to classify the noise level of the product.
The CEVAA also has extensive experience in this area, particularly with equipment manufacturers in the Automotive sector:
- Trunk box with emergency inflation kit
- Tramway seats (with complete measurements taken directly on the system’s operating site for reproduction on a vibration bench)
- HVAC vehicles
Squeak & Rattle simulation
In addition to having this expertise, we offer our customers to take this subject into account upstream, during the product development phase.
Indeed, an additional skill “Squeak & Rattle simulation” makes it possible to detect potential problems with parasitic noise. An expertise that the CEVAA has mastered for several years with achievements in project mode for automotive manufacturers & suppliers, for the railway sector, etc.
FOR MORE INFORMATION, CONTACT US TO DISCUSS TECHNICALLY ON YOUR NEEDS!