Browse Publications Technical Papers 2007-01-2300
2007-05-15

A Fully Absorptive Vehicle Underbody - A New Noise Abatement Strategy 2007-01-2300

Worldwide OEM's are seeking for potential to further reduce noise & CO2 pollution. Especially the European premium class vehicles are basically all equipped with aerodynamic under-shields in order to reduce the air drag coefficient, and hence to lower fuel consumption and CO2 emission. The complete absorptive vehicle underbody approach has proved to be a promising noise abatement strategy. First, it leads to substantial exterior and interior noise improvements and also to a reduction of the disturbing cold start Diesel engine noise in the neighborhood. Second, it bears significant potential for further weight reduction.
The absorptive underbody treatments were first developed in the virtual environment of Statistical Energy Analysis (SEA), where each component is specified according to its acoustic characteristics, namely its airflow Resistivity.
A complete underbody absorption package consists of; Absorptive engine shield, Absorptive aerodynamic body shield, Absorptive textile wheel arch liners (front & rear), and Absorptive heat shields.
During a second optimization loop a full vehicle SEA model was used to fine-tune the entire acoustic package in respect of best acoustic performance with minimum weight. This new strategy of a complete absorbing vehicle underbody has been positively tested on several vehicles in the lab and on the road. Exterior & interior noise reductions up to 1.5 dB(A) and 3.0 dB(A) respectively, were achieved.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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:
TECHNICAL PAPER

Functional and Material Acoustic Optimization integrated into Underbody Systems for Vehicle Performance Improvement

2007-01-2350

View Details

TECHNICAL PAPER

CFD Study Concerning the Influence of the Underbody Components on Total Drag for a SUV

2009-01-1157

View Details

TECHNICAL PAPER

Powertrain Acoustic Characterization at High Frequencies: Acoustic Source Modeling Based on Sound Intensity Measurements

2003-01-1457

View Details

X