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NVH Variations in Diesel Engine Populations
Technical Paper
2003-01-1723
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Customer feedback indicated that there was a difference in noise levels and frequency content between nominally identical diesel engines manufactured in two different plants. A test program was created to determine whether this perceived difference was real. This program opened the opportunity to investigate several levels of variability in SAE J-1074 noise measurements. From the data, estimates of confidence intervals were developed to predict true mean noise levels in the presence of back-to-back, install-test-remove, and sample-to-sample test variability. The data from this project can be used to estimate the number of tests required in order to achieve a given level of accuracy in estimating the true mean noise level of an engine or of an engine population. The results can also be used to design a test program that will provide a given level of confidence in determining whether there is a statistically significant difference between two engine populations.
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Citation
Reinhart, T., Sampath, A., Bagga, K., and Leistensnider, G., "NVH Variations in Diesel Engine Populations," SAE Technical Paper 2003-01-1723, 2003, https://doi.org/10.4271/2003-01-1723.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
- SAE Recommended Practice J1074 “Engine Sound Level Measurement Procedure” February 1987
- Ruffinen M.A. Zen Hamilton D.A. Hayes P.A. Reinhart T.E. “J366 Driveby Variability” SAE Paper 951357 June 1995
- Beckwith, Marangoni Lienhard “Mechanical Measurements” Addison Wesley Publishing Co. Reading MA 1995