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The Use of in Vehicle STL Testing to Correlate Subsystem Level SEA Models
Technical Paper
2003-01-1564
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For the assessment of vehicle acoustics in the early design stages of a vehicle program, the use of full vehicle SEA models is becoming the standard analysis method in the US automotive industry. One benefit is that OEM's and Tier 1 suppliers are able to cascade lower level acoustic performance targets for NVH systems and components. Detailed SEA system level models can be used to assess the performance of systems such as dash panels, floors and doors, however, the results will be questionable until test data Is available. Correlation can be accomplished with buck testing, which is a common practice in the automotive industry for assessing the STL (sound transmission loss) of vehicle level components. The opportunity to conduct buck testing can be limited by the availability of representative bodies to be cut into bucks and the availability of a transmission loss suite with a suitably large opening. In addition, the temporary fixture used to mount the test structure does not typically provide representative boundary conditions. Boundary conditions are particularly important when the in-vehicle performance is dependent on point connections at hinges / locking mechanisms and flexible seals at the perimeter of the system such as found in doors or lift-gate.
In this paper the use of in-vehicle testing on prototype vehicles to assess the STL for the vehicle systems and the SEA models are discussed. Results are presented for a dash panel, floor system and door systems. The measurements are compared with predictions from system level SEA (Statistical Energy Analysis) models of the test systems. It is concluded that subsystem level SEA models can be used to assess the design and correlate well with STL measurements from in-vehicle tests.
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Citation
Connelly, T., Knittel, J., Krishnan, R., and Huang, L., "The Use of in Vehicle STL Testing to Correlate Subsystem Level SEA Models," SAE Technical Paper 2003-01-1564, 2003, https://doi.org/10.4271/2003-01-1564.Also In
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6; Published: 2004-09-15
Number: V112-6; Published: 2004-09-15
References
- Huang M. Krishnan R Knittel J. Connelly T “Development of a Luxury Vehicle Acoustic Package using SEA full vehicle model” SAE paper 2003-01-1554 2003
- DeJong. R.G. “A study of vehicle interior noise using statistical energy analysis” SAE paper 850960 1985
- Moeller M.J. Powell R.E. “Review of statistical energy analysis (SEA) applied to the automotive industry 1985 to 1997” Noise-Con 98
- SAE standard J1400 ‘Laboratory Measurement of the airborne sound barrier performance of automotive materials and assemblies’ 1990-05
- Fahy F. “Sound Intensity” Elsevier Applied Science May 1989