TRUCK NOISE III-F: FINAL CONFIGURATION OF FREIGHTLINER QUIETED TRUCK
This report provides the rationale for selecting a final set of noise treatments for the Freightliner Quieted Truck, describes the salient features of the treatments, and presents the noise and performance characteristics of that truck prior to its entering a one-year field test. Using the results of noise level vs. cost optimization study and having the objective of field-testing some innovative noise-control techniques, we built a truck with many minor treatments and the following principal features: a partial engine enclosure lined with sound-absorptive material, a manifold muffler, two-stage engine mounts, and a thermostatically controlled fan. The final truck configuration was 16 dB(A) quieter than contemporary units (generating 72 dB(A) when measured according to the SAE J366b Recommended Practice), obtained 15 to 20% better fuel economy, but had a slightly inferior cooling index.
- Prepared in cooperation with Freightliner Corp., Portland, Oreg. See also PB-240 010.
Bolt, Beranek and Newman, Incorporated50 Moulton Street
Cambridge, MA USA 02138
Office of Noise Abatement400 7th Street, SW
Washington, DC USA 20590
Freightliner Corporation2525 SW Third Avenue
Portland, OR USA 97201
- Kaye, M C
- BENDER, E K
- Publication Date: 1974-10
- Pagination: 65 p.
- TRT Terms: Acoustic measuring instruments; Acoustics; Diesel engines; Engines; Fans; Fuel consumption; Mufflers; Noise; Noise control; Sound absorption; Sound level; Traffic noise; Trucks
- Uncontrolled Terms: Noise reduction
- Old TRIS Terms: Acoustic measurement; Cooling fans; Engine noise; Truck noise
- Subject Areas: Energy; Environment; Highways; Motor Carriers; Safety and Human Factors; Vehicles and Equipment;
- Accession Number: 00090417
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: 6
- Files: NTIS, TRIS
- Created Date: May 29 1975 12:00AM