Diesel crankshaft failures in marine industry— A variable inertia aspect

Pasricha, M. S.; Carnegie, W.

doi:10.1016/s0022-460x(81)80144-7

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…With little attention given to torsional vibrations at the developmental stages of off-highway Diesel Engine, several torsional vibration problems such as crankshaft failure, flywheel bolt failure, bearing bush pitting, increasing knock noises of timing gear, decreasing engine power and others [3][4][5], occurs commonly during operations. Also, since mechanize land cultivation is on the increase globally, the significance of Noise, Vibration and Harshness (NVH) levels from agricultural machinery on their performance are on the rise with high global awareness, currently.…”

Section: Introductionmentioning

confidence: 99%

Research on torsional vibration reduction of crankshaft in off-road diesel engine by simulation and experiment

Sun¹,

Luo²,

Shang³

et al. 2018

J. vibroeng.

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Formerly, torsional vibration of crankshaft in off-highway diesel engine (agricultural machinery) were given little attention at their developmental stages, however with increasing agricultural activities, numerous torsional vibration problems have been noted to occur in agricultural machinery, especially in their diesel engines. This results in engine vibration, crankshaft failure and undesirable engine noise. In this paper, a six-cylinder four-stroke inline diesel engine's crankshaft model was developed using AVL Excite Designer. After experimentally validating the model, it was used to numerically determine the torsional vibrations of a crankshaft. For the reduction of torsional vibration, two methods of crankshaft improvements were proposed based on simulation results. The first method, is to decrease the inertia of the crank pulley while the second, involves the replacement of the crank pulley with a torsional vibration damper. To ensure minimal engine alterations and cost effectiveness, the second improvement method was adopted for improving torsional vibration. Afterwards, engine radiating noise and surface vibration measurements were conducted to ensure that the required limits were achieved by the improved engine. The simulation, experiment and the improvement process of the crankshaft torsional vibration are documented further in this research. These improvements have applicable values in the developmental or quality enhancement stage of diesel engines used in agricultural machinery.

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Section: Introductionmentioning

confidence: 99%

Research on torsional vibration reduction of crankshaft in off-road diesel engine by simulation and experiment

Sun¹,

Luo²,

Shang³

et al. 2018

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…It was found that stress magnification due to secondary resonance failed to appear. Following this, Pasricha and Carnegie [7,8] carried out further investigations to explain the secondary resonance phenomenon. It was realized that Draminsk's work served only to indicate, in very broad terms, the circumstances in which adverse effects could be anticipated.…”

Section: Introductionmentioning

confidence: 99%

Effect of the reciprocating mass of slider-crank mechanism on torsional vibrations of diesel engine systems

Pasricha

Hashim

2017

AJSTD

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The torsional vibration phenomenon in the running gear of reciprocating engine systems is usually dealt with by considering a series of constant inertias connected by sections of massless shafting. However in reality, a slider crank mechanism is a vibrating system with varying inertia because the effective inertia of the total oscillating mass of each crank assembly varies twice per revolution of the crankshaft. Large variations in inertia torques can give rise to the phenomenon of secondary resonance in torsional vibration of modern marine diesel engines which can not be explained by conventional theory incorporating only the mean values of the varying inertias. In the past associated secondary resonances and regions of instability tended to be dismissed by most engineers as interesting but of no importance. The situation changed in recent years since there is evidence of the existence of the secondary resonance effects which could have contributed to a number of otherwise inexplicable crankshaft failures in large slow speed marine engines. The cyclic variation of the polar moment of inertia of the reciprocating parts during each revolution causes a periodic variation of frequency and corresponding amplitude of vibration of reciprocating engine systems. It also causes an increase in the speed range over which resonance effects are experienced and only a partial explanation of the behaviour of the systems has been worked out. It is impossible to avoid these instabilities by changes in the design, unless of course the variations in mass and spring constant can be made zero. In the present paper a critical appraisal of the regions of instability as determined from the equation of motion which takes into account variation of inertia is given. The motion in the form of complex waveforms is studied at different speeds of engine rotation. A comparison of theoretical results with Goldsbrough's experimental results and Gregory's analysis is included.

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“…In this regard, the papers of Draminsky [6,7] and Archer [8] are worthy of note. In the same area of research, the investigation carried out by Pasricha and Carnegie in a number of papers published from 1971 [9] to 1981 [10] and the recent works of Brusa et al [11], Hesterman and Stone [12] and Drew et al [13] are also to be referred to. Furthermore, the analyses of Porter [14], Denman [15] and Ashra®uon and Whitman [16], regarding the occurrence of parametric excitation in systems characterized by a periodic steady state are well worth reading.…”

Section: Introductionmentioning

confidence: 99%

Dynamical behaviour of a torsional system with parametric and external excitations

Adiletta

Guido

2000

Proceedings of the Institution of Mechanical Engineers, Part C:

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The dynamic behaviour of a torsional system with a one-cylinder, reciprocating compressor driven by an asynchronous motor is studied using a two degrees-of-freedom (2 DOF) lumped-parameter theoretical model. The model takes into account the variability of the mass moment of inertia of the crank mechanism and the presence of pressure forces loading the compressor piston. The influence of the ratio of the variable to the constant part of inertia in the crank mechanism and the effect of the load torque due to pressure forces acting on the piston are examined in relation to system dynamic behaviour. Experimental data, obtained with the adoption of a suitable rig, show that the theoretical indications can be considered reliable, despite the approximation that was given to the mathematical model as far as the treatment of the damping and the absence of clearances were concerned.

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Diesel crankshaft failures in marine industry— A variable inertia aspect

Cited by 7 publications

References 4 publications

Research on torsional vibration reduction of crankshaft in off-road diesel engine by simulation and experiment

Research on torsional vibration reduction of crankshaft in off-road diesel engine by simulation and experiment

Effect of the reciprocating mass of slider-crank mechanism on torsional vibrations of diesel engine systems

Dynamical behaviour of a torsional system with parametric and external excitations

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