In recent years there has been an increased interest from truck manufacurers in reducing the noise from internal combustion engines through stiffening solutions like bearing beams, ladder frames, an bedplates. Ths paper presents a short literature review of experiences published on the topic. Results of a experimental study of engine modificatons with a bearing beam, a ladder frame and an isolate oil sump are pesented as well. The beam and the frame were designed so that hey can be installed together without vibration propagating connections and to give high stiffness in the areas where they are most effective. The stuy was performed on a reatively light 9-liter six-cylinder diesel engine with an engine block og 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 substanially increased by isolation of the oil sump. The results also show where the componets of the ladder frame are effective an that a bearing beam can be an unsuitable solution for deep skirt engines as reonances are shifted to higher frequencies that an be more effectively transferred and radiated.
Noise reduction of diesel engines with internal stiffeners
Lärmminderung bei Dieselmotoren durch den Einbau von Steifigkeitselementen
Noise Control Engineering Journal ; 45 , 1 ; 1-13
1997
13 Seiten, 19 Bilder, 1 Tabelle, 20 Quellen
Article (Journal)
English
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