NOISE PROBLEMS WITH MOTOR VEHICLES

GERAEUSCHPROBLEME AN KRAFTFAHRZEUGEN

COMMENCING WITH A METHOD FOR CALCULATING VEHICLE NOISE AND FROM INVESTIGATIONS CARRIED OUT IT IS ESTABLISHED THAT EXTERNAL NOISE IS DETERMINED MAINLY BY THAT EMITTED FROM THE ENGINE. WITHOUT CONSIDERABLE INVESTIGATIONS INTO THE DESIGN CONCEPTION AND CONSTRUCTION OF THE ENGINE, A SIGNIFICANT REDUCTION IN NOISE EMISSION IS NOT POSSIBLE WITH CURRENT EXPENDITURE AND ENGINE SIZE. THE FOLLOWING MEASURES PROMISE SOME DEGREE OF SUCCESS AND HAVE BEEN INVESTIGATED: PLACING THE ENGINE IN A CAPSULE; REDUCING PERFORMANCE BASED ON ENGINE CAPACITY; CHANGING FROM AIR- TO WATER COOLING; THE CHANGE OVER TO NEW TYPES OF ENGINE CONSTRUCTION. WITH GREATER ADDITIONAL NOISE ABSORBTION IN THE ENGINE AREA, A SECONDARY NOISE PREVENTION MEASURE IS FURTHER STUDIED. THE FOLLOWING ARE GIVEN IN TABULAR FORM: EXTERNAL NOISE LIMITS AND THEIR DEVELOPMENT IN PERSPECTIVE; EXTERNAL NOISE ACCORDING TO TEST RECOMMENDATIONS; REDUCTION OF THE NOISE LEVEL FROM ENGINES WITH HIGH REVOLUTIONS AND HIGH PERFORMANCE; REDUCTION OF EXTERNAL AND INTERNAL NOISES BY PLACING THE ENGINE IN A CAPSULE; INCREASING THE SIZE AND MATERIAL COSTS WITH A REDUCTION IN EXTERNAL NOISE LEVEL BY APPROXIMATELY 2 DECIBELS (A) BY REDUCING THE AREA OF OPENINGS IN THE ENGINE SPACE; LIMITS FOR INTERNAL NOISE LEVELS AND THEIR DEVELOPMENT IN PERSPECTIVE; LIMITS FOR INTERNAL NOISE LEVEL BY EMPIRICAL CALCULATION FORMULAE; INTERNAL NOISE LEVEL FROM TEST RECOMMENDATIONS; INCREASES IN SIZE AND MATERIAL COSTS WITH A REDUCTION OF APPROXIMATELY 2 DECIBELS (A) IN THE INTERNAL NOISE LEVEL BY GREATER NOISE ABSORPTION IN THE ENGINE SPACE; INCREASES IN SIZE AND MATERIAL COSTS WITH A REDUCTION OF APPROXIMATELY 2 DECIBELS (A) BY GREATER ADDITIONAL NOISE ABSORBTION MEASURES.

Language

  • German

Media Info

  • Pagination: 114-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01292714
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD
  • Created Date: Nov 21 2010 3:40AM