Fiscal 1996 R and D under a consignment from NEDO of environmental technology such as recycling. 2. Automobile running sound reduction technology (for public)
Fiscal 1996 R and D under a consignment from NEDO of environmental technology such as recycling. 2. Automobile running sound reduction technology (for public)
Tire/road noise and the running performance were studied. Tests were conducted using a drum testing machine. If kinds and frequencies of tires are different, noise radiation characteristics are also different, and the degree of the differences are more remarkable in tires of passenger cars than those of large sized cars. Also observed was special frequency noise caused by natural vibration of tires. Noise increases when there are translots in tires; it decreases when the translots have angles. In hydroplaning, tires which had translots installed inclinedly generate less noise. The sound absorbing rate of the pavement using dense particle asphalt-concrete mixture is low, below 0.2, but the drainage type pavement (three kinds) showed high sound absorbing rates (0.4-0.7) in each kind. Noise reduction by the drainage type pavement was seen also in the engine type noise. Further, prediction of noise propagation was possible to a certain extent using the Allard model. As to lock braking force coefficients on the wet road, there are no definite differences between roads in terms of passenger cars, but the coefficients are higher in the drainage type pavement than that using the dense particle asphalt-concrete mixture in terms of large sized cars. On dry roads, those in the use of dense particle asphalt-concrete mixture are the highest. 3 refs., 96 figs., 11 tabs.
Dokumentinformationen
Fiscal 1996 R and D under a consignment from NEDO of environmental technology such as recycling. 2. Automobile running sound reduction technology (for public)
1997
101 pages
Report
Keine Angabe
Englisch
Road Transportation , Noise Pollution & Control , Automobiles , Noise pollution abatement , Tires , Recycling , Road transport , Frequency dependence , Acoustic measurements , Environmental Engineering , Eigenfrequency , Notches , Hydrodynamics , Pavements , Porosity , Brakes , Asphalts , Concretes , EDB/560400 , EDB/320203
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