Browse Publications Technical Papers 2018-01-1532

Mechanical Retractor Noise Evaluation on Electrodynamic Shaker: Test Procedure 2018-01-1532

Modern vehicles are driven with various speeds over specific rough road tracks to detect the presence of annoying buzz, squeak and rattle sounds. As known in the occupant safety industry the mechanical locking systems of seat belt retractors can be significant noise sources, when excited by road vibrations.
A reliable bench test procedure is necessary to quantify the acoustic performance of retractors, verify production quality, and derive realistic acoustic product targets. With this goal, a vibration noise test procedure has been developed condensing the work over three years by the K2 Comet automotive research project X2T1, various OEM retractor noise specifications closed to public and own research. The load case in this specification has been defined as horizontal 60 Hz bandlimited broadband excitation, while the N10 instationary loudness metric has been selected to characterize the retractor acoustic performance. A single load case along with a single value linear metric have been found to adequately characterize retractor noise without added test complexity. The enhanced reliability can promote the selection of a more silent retractor type and eases discussions in the automotive industry about retractor noise. This publication offers a developed test procedure, with the potential to reduce the number of retractor noise procedures currently in use.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Motor Vehicle Seat Belt Assembly Installation


View Details


Rollover Testing Methods


View Details


Dolly Rollover Recommended Test Procedure


View Details