NOISE REDUCTION IN DIRECT INJECTION DIESEL ENGINES. PART 2

GERAEUSCHEMINDERUNG AN DIREKTEINSPRITZENDEN DIESELMOTOREN. 2. TEIL

The future limit values covering noise emission of motor vehicles will make it necessary to decrease engine noise further. Structure-borne noise excitation, structure-borne noise conduction and, under certain conditions, airborne noise must be reduced. In the case of the direct injection diesel engine, combustion excitation is particularly relevant. Any optimization achieved here might reduce engine noise by up to 4 dB(A) in the example cited without disadvantages in terms of consumption. Using various aids such as finite element method, modal analysis and pulsed sound methods, it is possible to improve load bearing structures systematically with a view to a decrease in the amount of structure-borne noise. In one example given, a reduction by some 3 dB(A) was reached. For extreme requirements, engine encapsulation has been technically proven. By combining engine-integrated measures with full encapsulation, the pass-by noise level of a truck was decreased by 13 dB(A). The report describes techniques for achieving noise reduction in diesel engines.

  • Corporate Authors:

    Motor Industry Research Association

    Watling Street
    Nuneaton CV10 0TU, Warwickshire,   England 
  • Authors:
    • FLOTHO, A
    • SPESSERT, B
  • Publication Date: 1991

Language

  • German

Media Info

  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00619633
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: MIRA TRANS-91/01
  • Files: TRIS
  • Created Date: Sep 1 2004 9:57PM