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  1. 3 Polish Maritime Research

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  1. 3 Homik W.

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  1. 1 2012

  2. 1 2011

  3. 1 2010

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1

Damping of torsional vibrations of ship engine crankshafts - general selection methods of viscous vibration damper

100%
Homik W.
Polish Maritime Research
|
2011
|
tom 18
|
nr 3
This paper describes causes of torsional vibrations generated in ship engine crankshafts. Means for damping the torsional vibrations as well as general methods for selection of viscous torsional vibration dampers for a given type of engine are also presented. Exemplary results of calculations connected with selection of a viscous torsional vibration damper intended for a six-cylinder engine, are attached
2

The effect pf liquid temperature and viscosity on the amplitude-frequency characteristics of a viscotic torsion damper

100%
Homik W.
Polish Maritime Research
|
2012
|
tom 19
|
nr 4
The article discusses causes of the appearance of transverse, longitudinal and torsional crankshaft vibrations in multi-cylinder internal combustion engines. Particular attention is paid to the torsional vibration which is the most severe threat to engine crankshafts. Damping methods making use of torsion dampers are presented. With the reference to viscotic dampers, problems with their damping efficiency are discussed in the context of viscosity changes of the damping liquid. The article also presents the amplitude-frequency characteristics of a series of viscotic dampers, which were recorded experimentally on the research rig and on a real object. An idea of vibration damper metric is given
3

Diagnostics, maintenance and regeneration of torsional vibration dampers for crankshafts of ship diesel engines

100%
Homik W.
Polish Maritime Research
|
2010
|
tom 17
|
nr 1
Periodically changeable gas and inertia forces which occur during operation of engine generate transverse, axial and torsional vibrations of crankshafts of multi-cylinder combustion engines. Torsional vibrations are those which endanger crankshafts of multicylinder combustion engines the most. In order to minimize their impact a torsional vibration damper is installed at crankshaft’s free end. Its technical state directly influences lifetime and reliability of engine. In this paper methods of diagnosing, maintenance and regeneration of torsional vibration dampers used in shipbuilding, are discussed. Also, are presented results of multi-year statistical investigations carried out in cooperation with a firm maintaining and regenerating ship engine torsional vibration dampers, which illustrate types of failures occurring in viscous and spring torsional vibration dampers
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