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Noise reduction of diesel engines with internal stiffeners
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0001-5435-2069
Luleå tekniska universitet.
1997 (English)In: Noise Control Engineering Journal, ISSN 0736-2501, E-ISSN 2168-8710, Vol. 45, no 1, p. 1-13Article in journal (Refereed) Published
Abstract [en]

In recent years there has been an increased interest from truck manufacturers in reducing the noise from internal combustion engines through stiffening solutions like bearing beams, ladder frames, and bedplates. This paper presents a short literature review of experiences published on the topic. Results of an experimental study of engine modifications with a bearing beam, a ladder frame, and an isolated oil sump are presented as well. The beam and the frame were designed so that they can be installed together without vibration propagating connections and to give high stiffness in the areas where they are most effective. The study was performed on a relatively light 9-liter six-cylinder diesel engine with an engine block of deep skirt type. The influence of the engine modifications was investigated through measurements of sound intensity, sound pressure, running modes, internal and external vibrations, and mobility. The results show that a ladder frame effectively reduces the noise from a deep skirt engine and that the reductions are substantially increased by isolation of the oil sump. The results also show where the components of the ladder frame are effective and that a bearing beam can be an unsuitable solution for deep skirt engines as resonances are shifted to higher frequencies that can be more effectively transferred and radiated.

Place, publisher, year, edition, pages
1997. Vol. 45, no 1, p. 1-13
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-6123DOI: 10.3397/1.2828421ISI: A1997WK34500001Local ID: 452ed890-6fea-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-6123DiVA, id: diva2:979000
Note
Godkänd; 1997; 20060926 (biem)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ågren, AndersJohansson, Örjan

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