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Robustness and Reliability Enhancement on Retractor Noise Testing, from Development Considerations to Round Robin
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 13, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Event: 10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
Sensing and acting elements to guarantee the locking functions of seat belt retractors can emit noise when the retractor is subjected to externally applied vibrations. For these elements to function correctly, stiffness, inertia and friction needs to be in tune, leading to a complex motion resistance behavior, which makes it delicate to test for vibration induced noise. Requirements for a noise test are simplicity, robustness, repeatability, and independence of laboratory and test equipment.
This paper reports on joint development activities for an alternative test procedure, involving three test laboratories with different equipment. In vehicle observation on parcel shelf mounted retractors, commercially available test equipment, and recent results from multi-axial component tests , set the frame for this work. Robustness and reliability of test results is being analyzed by means of sensitivity studies on several test parameters. This work aims to obtain fundamental findings for retractor noise testing, which should be addressed by any general test procedure, to provide a maximum of repeatability and reliability.
Combining the knowledge about field relevant retractor noise sources from bench testing with CAE based  predictions of the retractors’ in-vehicle behavior can yield much easier and quicker in a suitable acoustic in-vehicle performance.
CitationScholz, J., Amort, M., Payer, J., Kapsalis, C. et al., "Robustness and Reliability Enhancement on Retractor Noise Testing, from Development Considerations to Round Robin," SAE Technical Paper 2018-01-1533, 2018, https://doi.org/10.4271/2018-01-1533.
Data Sets - Support Documents
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- Schaffner, T., Girstmair, J., Neumann, J., Witfeld, E., and Melzer, W. , “Prediction of Eigenfrequencies and Eigenmodes of Seat Belt Retractors in the Vehicle Supporting an Acoustical Optimal Retractor Integration by CAE,” SAE Technical Paper 2018, 2018 (accepted).
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- Malinow, I. and Perkins, N. , “Seat Belt Retractor Rattle: Understanding Root Sources and Testing Methods,” SAE Technical Paper 1999-01-1729, 1999, doi:10.4271/1999-01-1729.
- Liu, K., DeVilbiss, T., and Freeman, M. , “Experimental Analysis of Rattle Noise Abatement in Seatbelt Retractor Assembly,” SAE Technical Paper 1999-01-1723, 1999, doi:10.4271/1999-01-1723.
- Morgan, C., Naganarayana, B., and Shankar, S. , “Comparative Evaluation of Seat Belt Retractor Websense Mechanism Rattle Noise,” SAE Technical Paper 2004-01-0391, 2004, doi:10.4271/2004-01-0391.
- Machens, K.-U. and Weisgerber, I. , “Geräuschbeurteilung Sicherheitsgurte: Klappern auf dem Prüfstand,” Fortschritte der Akustik - DAGA 2010, 2010, 435-436.
- Machens, K.-U., Neumann, J., Scholz, J., and Markiewicz, M. , “Sensor Ball Rattle: Experimental and Numerical Sensitivity Study for Seat Belt Applications,” ASA Proc. Mtgs. Acoust. 30:065002, 2017, doi:10.1121/2.0000531.