Matches in SemOpenAlex for { <https://semopenalex.org/work/W79745286> ?p ?o ?g. }
Showing items 1 to 70 of
70
with 100 items per page.
- W79745286 abstract "As part of a federally funded research project to update vehicle noise emission levels, the California Department of Transportation (Caltrans) examined heavy truck noise emission levels on grades in California. Nearly 1,800 noise measurements were taken at 6 locations along Interstate and state freeways with grades ranging from +3 to +7 percent. The six sites were located far enough upgrade to allow heavy trucks to decelerate from free-flowing speeds of 55 to 60 mph to sustained crawl speeds before measurement. The noise data showed no direct grade dependency at any observed speed. This may have been caused by the inverse relationship between grade steepness and truck weight for a given speed. In order to maintain the same crawl speeds, trucks must be carrying lighter loads on steeper grades, and vice versa, possibly resulting in offsetting effects on noise emission levels. Further research into the exact cause is recommended. Speed dependency, however, was significant. A second-degree polynomial equation for noise energy versus log sub 10 speed was found to represent the best curve fit. A combined speed-dependent curve for +3 to +7 percent grades was developed. Observed speed distributions were found to be grade dependent and appeared to agree with those typically found for trucks on grades in California. This information was used to develop reference energy mean emission levels for heavy trucks on grades up to +7 percent in 1-percent increments. For 3 to 5 percent grades, these values are 1.4 to 0.5 dBA higher than those developed by the currently used NCHRP 117 method; above 5 percent grade the default values are 0.2 to 2.1 dBA lower than those of NCHRP 117." @default.
- W79745286 created "2016-06-24" @default.
- W79745286 creator A5079455723 @default.
- W79745286 date "1986-01-01" @default.
- W79745286 modified "2023-09-23" @default.
- W79745286 title "HEAVY-TRUCK NOISE EMISSION LEVELS ON GRADES IN CALIFORNIA" @default.
- W79745286 hasPublicationYear "1986" @default.
- W79745286 type Work @default.
- W79745286 sameAs 79745286 @default.
- W79745286 citedByCount "0" @default.
- W79745286 crossrefType "journal-article" @default.
- W79745286 hasAuthorship W79745286A5079455723 @default.
- W79745286 hasConcept C105795698 @default.
- W79745286 hasConcept C115961682 @default.
- W79745286 hasConcept C121332964 @default.
- W79745286 hasConcept C127413603 @default.
- W79745286 hasConcept C154945302 @default.
- W79745286 hasConcept C163294075 @default.
- W79745286 hasConcept C171146098 @default.
- W79745286 hasConcept C22212356 @default.
- W79745286 hasConcept C24890656 @default.
- W79745286 hasConcept C2781353297 @default.
- W79745286 hasConcept C33923547 @default.
- W79745286 hasConcept C39432304 @default.
- W79745286 hasConcept C41008148 @default.
- W79745286 hasConcept C52121051 @default.
- W79745286 hasConcept C99498987 @default.
- W79745286 hasConceptScore W79745286C105795698 @default.
- W79745286 hasConceptScore W79745286C115961682 @default.
- W79745286 hasConceptScore W79745286C121332964 @default.
- W79745286 hasConceptScore W79745286C127413603 @default.
- W79745286 hasConceptScore W79745286C154945302 @default.
- W79745286 hasConceptScore W79745286C163294075 @default.
- W79745286 hasConceptScore W79745286C171146098 @default.
- W79745286 hasConceptScore W79745286C22212356 @default.
- W79745286 hasConceptScore W79745286C24890656 @default.
- W79745286 hasConceptScore W79745286C2781353297 @default.
- W79745286 hasConceptScore W79745286C33923547 @default.
- W79745286 hasConceptScore W79745286C39432304 @default.
- W79745286 hasConceptScore W79745286C41008148 @default.
- W79745286 hasConceptScore W79745286C52121051 @default.
- W79745286 hasConceptScore W79745286C99498987 @default.
- W79745286 hasIssue "1058" @default.
- W79745286 hasLocation W797452861 @default.
- W79745286 hasOpenAccess W79745286 @default.
- W79745286 hasPrimaryLocation W797452861 @default.
- W79745286 hasRelatedWork W1492141693 @default.
- W79745286 hasRelatedWork W1594954963 @default.
- W79745286 hasRelatedWork W166044628 @default.
- W79745286 hasRelatedWork W1974500373 @default.
- W79745286 hasRelatedWork W1988042644 @default.
- W79745286 hasRelatedWork W1988478996 @default.
- W79745286 hasRelatedWork W2087183044 @default.
- W79745286 hasRelatedWork W2249975711 @default.
- W79745286 hasRelatedWork W2381354929 @default.
- W79745286 hasRelatedWork W2593398596 @default.
- W79745286 hasRelatedWork W35016130 @default.
- W79745286 hasRelatedWork W568848829 @default.
- W79745286 hasRelatedWork W577995802 @default.
- W79745286 hasRelatedWork W585203035 @default.
- W79745286 hasRelatedWork W585625967 @default.
- W79745286 hasRelatedWork W589152045 @default.
- W79745286 hasRelatedWork W603732819 @default.
- W79745286 hasRelatedWork W639705333 @default.
- W79745286 hasRelatedWork W67335371 @default.
- W79745286 hasRelatedWork W812447684 @default.
- W79745286 isParatext "false" @default.
- W79745286 isRetracted "false" @default.
- W79745286 magId "79745286" @default.
- W79745286 workType "article" @default.