Buses and coaches built in 1966 show little improvement and sometimes deterioration from noise point of view when compared with their predecessors of 30 yr ago; areas and means of improvements are discussed together with various methods of testing vehicle noise such as acceleration test, which Ministry of Transport plans to use; with regard to permissible noise level, it is expected that limit will be set at 87 db (A) for existing and 85 db (A) for new vehicles; research made in reducing engine and combustion noise by means of modifications to combustion chamber and fuel injection process; boxing-in of engines is studied as means of reducing vehicle 's external noise level.
Let's have less noise
Bus Coach
Bus and Coach ; 38 , n 6 ; p 190-194
1966
5 pages
Aufsatz (Zeitschrift)
Englisch
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