Secondary Inertia Effects in the Torsional Vibration of Reciprocating Engines—A Literature Review

Hesterman, Dianne; Stone, Brian

doi:10.1243/pime_proc_1995_209_117_02

Cited by 17 publications

(12 citation statements)

References 15 publications

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“…The resulting vibration superimposed upon steady engine speed yields engine order vibrations [23] which should be included in any practical analysis. Engine harmonics are used to describe the variation of the engine torque with time.…”

Section: Engine Torquementioning

confidence: 99%

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Effect of clutch lining frictional characteristics on take-up judder

Gkinis

Rahmani

Rahnejat

2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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Take-up judder is the first rigid body torsional mode of the clutch system, which occurs during clutch engagement. This phenomenon is induced by stick-slip oscillations at the friction lining interfaces between the clutch disc and flywheel, and the pressure plate. The phenomenon is influenced by the clutch lining friction characteristics, the topography of the mating-sliding surfaces and the operational conditions during the engagement process. Therefore, the interfacial characteristics are affected by contact pressure, interfacial slip speed and surface temperature. Take-up judder causes driver and vehicle occupant discomfort, as well as gradual wear of contacting surfaces. The response frequency of the system is reported to be in the range 5-20Hz, depending on the clutch system and vehicle inertia.In this paper the measured interfacial friction characteristics together with clamp load variation (contact pressure) under different surface temperatures are included in a multidegree of freedom dynamic analysis to obtain torsional vibrations of the system, pertaining to take-up judder conditions. Such an in-depth investigation has not hitherto been reported in literature. The paper shows that take-up judder is omnipresent under all clutch engagement conditions, but its poignancy is most evident at cold surface temperatures. It is also shown that the transient judder response has a broader spectral content that is generally acknowledged. Keywords Resistive torque Greek symbols Stiffness proportionality coefficient Damping ratioNon-dimensional time parameter

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Section: Engine Torquementioning

confidence: 99%

“…where, =1, is the harmonic order of the unbalanced torque, is the nominal angular velocity of the engine crankshaft, and is the initial phase of the ℎ order which for a 4-stroke combustion process is [23]: = 0.5,1,1.5,2,2.5,3 … . The engine modelled in this analysis is a 4-stroke 4-cylinder 1.81 Litre diesel engine.…”

Section: Engine Torquementioning

confidence: 99%

Effect of clutch lining frictional characteristics on take-up judder

Gkinis

Rahmani

Rahnejat

2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…However, it is important to note that for more complex propulsion systems, changes in inertia moment function of crankshaft rotation must be taken into account (Gregory 1954;Hestermann and Stone 1994):…”

Section: Internal Loadsmentioning

confidence: 99%

Dynamics of shaft lines of the landing ships

Grządziela

Batur

2017

Journal of Marine Engineering & Technology

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The paper presents an analysis of the dynamics of the shaft line of landing ship manoeuvre during grounding at a landing area. The work characterises the specific features of shallow water interactions on the propeller operation. There is a characteristic structure of the ship's propulsion system. Potential operational hazards arising from the problem of grounding and descent from shore shoals of a landing ship have also been identified. A model of sandy water interaction on propellers' torque was proposed for the dynamic calculations of shafts' loads. The results of the simulation of torsional vibrations on the shoal area are presented as well.

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“…7 The effect of variable inertia on the torsional system was studied by Pasricha and Carnegie 8 and also implemented in the equations of motion of the internal combustion engines. 9 A conclusion was made by Hesterman and Stone 10 that the unexpectedly large angular displacements occur in some coefficients of the engine speed due to the variable inertia characteristics of the cranktrain mechanism. The physics of motion of an assembly of constrained or restrained bodies was described by Rahnejat.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of torsional vibration system for a heavy-duty inline six-cylinder diesel engine

Karimaei

Mehrgou

Chamani

2019

Proceedings of the IMechE

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Torsional vibration is one of the major issues and very important calculation for the safe running of heavy-duty diesel engines, specifically crankshaft. Because of different applications of a heavy-duty diesel engine, different driven machine and different attaching systems are inevitable that affect the torsional system. The cranktrain contains the flywheel and torsional damper. The properties of these parts have significant effect on torsional vibration of the system as well as the crankshaft strength. Initial selection of these properties is usually specified based on engine designer experience and also the torsional vibration calculation of the cranktrain. In this paper, the focus is to find the optimum and reliable operating points for the elements in cranktrain using computer-aided engineering (CAE) tools. These are parameters like tuned mass inertia, flywheel inertia, damper stiffness, damper inertia, damper damping, coupling damping and coupling stiffness. The effect of these parameters on system design criteria, especially crankshaft life, was investigated. The results show high sensitivity of crankshaft safety factor to parameters like tuned mass inertia, damper damping coefficient and damper stiffness. Therefore, damper selection is the most important factor to increase the crankshaft life. The new contribution is that the parameters related to the whole cranktrain system that have the greatest effect were obtained and an optimisation was executed on these parameters to fulfil the vibration targets as well crankshaft life.

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Secondary Inertia Effects in the Torsional Vibration of Reciprocating Engines—A Literature Review

Cited by 17 publications

References 15 publications

Effect of clutch lining frictional characteristics on take-up judder

Effect of clutch lining frictional characteristics on take-up judder

Dynamics of shaft lines of the landing ships

Optimisation of torsional vibration system for a heavy-duty inline six-cylinder diesel engine

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