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MTZ Motortechnische Zeitschrift

MOTORTECHN.Z.

1976/07

37

8-Jul

269

274

0024-8525

Unknown(0)

The aims of the research work described in this paper consist of a fundamental knowledge concerning vibration transmission from combustion chamber to the noise radiating external crankcase surfaces with watercooled inline engines; furthermore, the influence of cast iron and cast aluminium as a material of crankcase, the origin of the noise of crankshaftpulleys, as well as the attenuation of vibration isolating elements for pipe systems. With watercooled inline engines, the main part of vibration energy is transmitted from cobustion chamber via crankdrive components to the noise radiating external surface, the natural vibration modes of the force transmitting parts exerting the main influence on the vibration transfer. The prediction elaborated by theoretical considerations, that engines the casing of which consist of cast aluminium produce an essentially higher noise level compared to engines made of cast iron, could not be confirmed with running engines. The position of the axial bearing of crankshafts with inline engines as well as the mass of crankshaft pulleys have a certain influence on the noise radiated by crankshaft pulleys. The measures vibration isolation of the pulley as well as the noise attenuating enclosure, however, are much more effective. With exhaust pipe systems sufficient vibration attenuation can be achieved by means of corrugated pipes and socalled piston ring compensators, the arrangement being very advantageous. The vibration isolation of air intake and cooling water pipes can be carried out by means of flexible rubber tubes.

diesel engine, methodology, vibration

KORPERSCHALLAUSBREITUNG BEI DIESELMOTOREN

Embase

Embase

Fachbach,H. A., Thien,G. E.

Fachbach, Heinz A., Forsch. Vereinig. Verbrenn. Kraftmaschinen, Graz

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1976