Dynamic Analysis of Crankshaft Using Component Mode Synthesis (Part 2)

Tanida, Koji; Kubota, Minoru; Hasegawa, Noboru; Nakagawa, Eiichi

doi:10.5988/jime1966.22.521

Cited by 2 publications

(4 citation statements)

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“…The stress in the shaft due to axial oscillation is quite small to use as an evaluation parameter in the research 3 . Hence, it is considered that the only risk of axial oscillation through amplitude, for example, in terms of the free-end amplitude of the crankshaft.…”

Section: Mathematical Modelsmentioning

confidence: 99%

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A recent approach to the research on axial oscillation of shaft system on ships

Hoang¹,

Huynh²,

Trần³

2021

Sci.Tech.Dev.J.-Eng.Tech.

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In the design of ship propulsion system, the study of oscillation is a great importance because they play a decisive role in the operating ability of the shaft system. Among ship shaft oscillations, axial oscillation has been only a particular interest after applying on ships for diesel engines with ratio of piston stroke and its diameter 3-4,4. In this paper, the special features of the computational model are presented when studying the axial oscillations on the ship shaft system. It should be emphasized that the system of differential equations in describing the free and forced oscillations can be obtained directly from the analogous equations of the torsion oscillation. However, unlike the torsional oscillation, the axial oscillation of the ship shaft system directly affects the hull through the thrust bearing. In order to solve with the problem of determining the forced and resonant axial oscillations based on the Runge-Kutta numerical method is done by directly integrating the system of 2nd order differential equations in describing the oscillations. Therefore, the paper presents the research results in proposing a procedure to reduce the order of 2nd order differential equations and providing an algorithm to solve the system of differential equations in describing axial oscillations. From that, it will be considered that the mechanism under which forces of variable value are applied to it, axial oscillation occurs. The accuracy in calculating of the axial oscillation depends not only on the accepted method of determining the free and forced oscillation, but also the proper in giving the parameters of the discrete model. If the masses are easy to calculate, the evaluation of the axial deformation of the crankshaft is not univariate because there are many formulas given on the basis of idealizing the crankshaft under the structure of bar. Hence, it is proposed to build a 3D model and determine the deformation of the engine crankshaft components by the finite element method.

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Section: Mathematical Modelsmentioning

confidence: 99%

“…Hence, it is proposed to build a 3D model and determine the deformation of the engine crankshaft components by the finite element method. [1][2][3][4][5][6][7][8][9]…”

mentioning

confidence: 99%

A recent approach to the research on axial oscillation of shaft system on ships

Hoang¹,

Huynh²,

Trần³

2021

Sci.Tech.Dev.J.-Eng.Tech.

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show abstract

“…However, all analyses in references [1, 4}7] fail to represent the crankshaft dynamic behavior, which can be very important under certain operating conditions or even essential for noise and vibration analysis of a crankshaft-engine block system. The idea of using dynamic substructuring in crankshaft analysis has been introduced in references [8,9]. The MSC/NASTRAN superelement capability [14] was used to perform a dynamic analysis of a long stroke diesel engine crankshaft using component mode synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…The present analysis does not rely on any of the simplifying assumptions of references [1, 4}7]. Furthermore, it can be even more accurate and computationally more e$cient than the analysis of references [8,9] since it uses Ritz vectors instead of eigenvectors to form the transformation basis. Ritz vectors are easier to compute and provide a more accurate dynamic representation of the structure.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Crankshaft Dynamic Analysis Using Substructuring With Ritz Vectors

Mourelatos¹

2000

Journal of Sound and Vibration

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Dynamic Analysis of Crankshaft Using Component Mode Synthesis (Part 2)

Cited by 2 publications

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A recent approach to the research on axial oscillation of shaft system on ships

A recent approach to the research on axial oscillation of shaft system on ships

An Efficient Crankshaft Dynamic Analysis Using Substructuring With Ritz Vectors

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