A Review of Recent Ship Vibration Papers

Ozsoysal, Reyhan

doi:10.1177/0583102404038874

Cited by 7 publications

(2 citation statements)

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“…Each layer is created from the adjacent inner layer using the same proportional constant or similarity ratio. The infinite number of nodal pressures will be transformed into a finite set of generalized coordinates using the global interpolation functions derived from (9). Similar to the stiffness matrices [12], it can be shown that there is a simple relation between the H matrices of similar elements, which allows this transformation to be performed at the local element level and the results summed up as geometrical progression series to be assembled to the global H matrix (see later).…”

Section: The Ffemmentioning

confidence: 99%

The fractal finite element method for added‐mass‐type problems

Leung

Fok

Dai

et al. 2008

Numerical Meth Engineering

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SUMMARYThe fractal finite element method (FFEM), originally developed for calculating stress intensity factors in fracture mechanics problems, has been extended to analyse fluid-structure interaction in the form of added-mass-type problems. These include the free vibration of a submerged spherical shell and the interaction between a dam and a reservoir. For the former problem, the numerical solution from the FFEM agrees well with the analytical solution, and the FFEM performed better than conventional finite elements and infinite elements in terms of efficiency. For the latter problem, the FFEM predicted an added mass profile that is different from that based on Westergaard's parabolic solution.

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Section: The Ffemmentioning

confidence: 99%

The fractal finite element method for added‐mass‐type problems

Leung

Fok

Dai

et al. 2008

Numerical Meth Engineering

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“…In small ships the living compartments are much closer to the machinery spaces, it shall aggravates the noise levels in the vicinity Brooker and Humphrey (2015). Resilient mountings, isolation, acoustic and thermal insulation, deck covering and loading tank spaces help in dissipating the noise transmission (Ozsoysal, 2004). The modal analysis methods for estimating the energy delivers by the machinery to its foundation are the semi-empirical, Nilson's grillage methods and statistical energy analysis (Tratch, 1985); Gaggero et al (2014).…”

Section: Introductionmentioning

confidence: 99%

Measurement of small vessel machinery vibration induced acoustic signature levels

Kumar¹,

Prasad²,

Nagesh³

2019

J. nav. arch. mar. engg.

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Ship vibrations, airborne and underwater noise levels have always been a challenging topic from a performance point of view in ship design, building and operation. The measurement shall help in monitoring the self-noise and the technical state of their machinery mechanism. The vibration levels on the main engine and auxiliary Genset foundation, airborne noise levels of the engine room and underwater self-noise levels of a small mechanized fishing trawler was measured at the jetty in idling condition. The vibration levels on the foundation measured the average value of 0.207 mm/s for the main engine and 1.36 mm/s for auxiliary Genset. The airborne noise levels measured 99 dB (A) in the engine room. The peak underwater sound pressure levels measured 162 dB re 1µPa. The response spectra indicate the peak vibration and noise levels in the lower frequency region <1.2 kHz. The machinery excitation forces transferred to the hull surface as pressure fluctuations which generated the airborne and underwater noise levels. Though the measurement limited to jetty conditions, detailed analysis can be useful for detection, classification, and tracking of small vessels.

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Free and forced vibration analyses of ship structures using the finite element method

Yucel

Arpaci

2013

J Mar Sci Technol

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A Review of Recent Ship Vibration Papers

Cited by 7 publications

References 0 publications

The fractal finite element method for added‐mass‐type problems

The fractal finite element method for added‐mass‐type problems

Measurement of small vessel machinery vibration induced acoustic signature levels

Free and forced vibration analyses of ship structures using the finite element method

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