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.
Truck Noise III-F: Final Configuration of Freightliner Quieted Truck
1974
65 pages
Report
No indication
English
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