Arvid Næss

Norwegian University of Science and Technology

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Oleg Gaidai

Shanghai Ocean University

Bernt J. Leira

Norwegian University of Science and Technology

Wei Chai

Wuhan University of Technology

Torgeir Moan

Norwegian University of Science and Technology

M. F. Dimentberg

Worcester Polytechnic Institute

O. Batsevych

Norwegian University of Science and Technology

Daniil Yurchenko

University of Southampton

Knut V. Høyland

Norwegian University of Science and Technology

Chana Sinsabvarodom

Chiang Mai University

Panagiotis Alevras

Technical University of Crete

Cooperative Institutions

Norwegian University of Science and Technology

NTNU Samfunnsforskning

SINTEF

SINTEF Ocean

Dalian University of Technology

Universidade Federal do Rio de Janeiro

Jiangsu University of Science and Technology

Shanghai Ocean University

Norsk Hydro (Norway)

Equinor (Norway)

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Probabilistic methods for estimation of the extreme value statistics of ship ice loads

Cold Regions Science and Technology (2017)

Wei Chai Bernt J. Leira Arvid Næss

Benchmark (surveying)

10.1016/j.coldregions.2017.11.012

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Citations (37)

Stochastic Analysis of Nonlinear Response of a Moored Structural System Under Narrowband Excitations

Solomon C. Yim Dongjun Yuk Arvid Næss I-Ming Shih

A semi-analytical method is developed for the stochastic analysis of a nonlinear moored ocean structure subjected to narrowband random waves. The method is then used to investigate the probability distribution of extreme values of the responses. To verify the accuracy and capability of the method in handling complex nonlinear behavior of the nonlinear moored ocean structure, experimental results are employed to calibrate numerical simulations and the resulting probability distributions obtained from the semi-analytical method. A nonlinear-structure nonlinearly damped model is employed to model the moored structure considered and the system coefficients are identified through the reverse multiple-input/single-output technique. An examination of the comparisons indicates that the structural response extreme value probability distributions obtained from the semi-analytical predictions are quite accurate.

Narrowband

10.1115/omae2006-92624

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Citations (3)

Response of a Rotating Shaft to Uniaxial Random Excitation

Journal of Applied Mechanics (2012)

M. F. Dimentberg Arvid Næss L. Sperling

Random vibrations are considered for a Jeffcott rotor subject to uniaxial broadband random excitation by a lateral force along one of its transverse axes. Exact analytical solution for mean square responses is obtained which provide quantitative description of two effects: the magnification of mean square whirl radius due to rotation; and the increasing mean square response along the nonexcited direction with increasing rotation speed, that is, the spread of vibration to all directions around the shaft. The latter effect clearly corresponds to the approaching forward whirl of the shaft approaching its instability threshold; it can be used for the on-line evaluation of the rotor’s stability margin from the simple processing of its measured response signals as demonstrated by direct numerical simulation.

Random vibration

Square (algebra)

10.1115/1.4005581

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Citations (5)

Short-term extreme ice loads prediction and fatigue damage evaluation for an icebreaker

Ships and Offshore Structures (2018)

Wei Chai Bernt J. Leira Arvid Næss

In this paper, the short-term extreme value statistics of the ice loads acting on ship hull and the fatigue damage due to ice loads actions are studied. Due to the stochastic nature of the ice-induced loads and randomness of the ice thickness, probabilistic methods and models are applied in order to find some correlations between the ice-induced loads statistics and the prevailing ice conditions. For the extreme value prediction, the average conditional exceedance rate method is applied to approximate the exact extreme value distribution. The short-term fatigue damage is estimated based on the S–N curve approach. Furthermore, probabilistic models, such as the Weibull distribution and the three-parameter exponential distribution are applied to approximate the distribution of the stress ranges due to ice loads actions and the performance of the fatigue damage evaluation based on probabilistic distribution functions of the stress ranges is studied.

Gumbel distribution

10.1080/17445302.2018.1427316

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Citations (27)

MODEL TESTS IN WAVES OF OIL BOOMS IN CATENARY CONFIGURATION

Arvid Næss

Catenary

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TIME SIMULATION OF THE DYNAMIC RESPONSE OF HEAVILY LISTED SEMI-SUBMERSIBLE PLATFORMS IN WAVES

Arvid Næss Jan Roger Hoff

This is a revised version of a paper presented at Marintec Offshore China, Shanghai, 1983. Some aspects of the dynamic response of a heavily-listed semi-submersible pontoon/column type of platform are discussed. It is pointed out that the equations of motion are essentially nonlinear for list and draught conditions where the pontoons are very close to, or penetrate, the water surface. A time domain solution technique is described and is shown to give fairly good agreement with experimental results.

Response amplitude operator

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Citations (1)

Reliability of Linear and Nonlinear Dynamic Systems under Multiplicative and Additive Noise

IUTAM bookseries (2011)

Arvid Næss D. V. Iourtchenko O. Batsevych

Multiplicative noise

10.1007/978-94-007-0732-0_7

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Citations (1)

Response statistics of rotating shaft with non-linear elastic restoring forces by path integration

Journal of Sound and Vibration (2017)

Oleg Gaidai Arvid Næss M. F. Dimentberg

Restoring force

Path integration

10.1016/j.jsv.2017.04.014

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Citations (11)

The joint crossing frequency of stochastic processes and its application to wave theory

Applied Ocean Research (1985)

Arvid Næss

Crest

Frequency band

10.1016/0141-1187(85)90016-1

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Citations (34)

Statistics of Combined Linear and Quadratic Springing Response of a TLP in Random Waves

Journal of Offshore Mechanics and Arctic Engineering (1994)

Arvid Næss

Abstract The paper presents the results of statistical analyses of combined first-order and second-order, sum-frequency response in heave, pitch, and roll of a TLP structure subjected to random, long-crested seas. The results are based on available numerically calculated data for the linear and quadratic transfer functions from the waves to the hydrodynamic loads on the TLP. It has also been assumed that the equations of motion in heave, pitch, and roll can be reasonably well approximated by a set of uncoupled, linear, and time-invariant equations.

Springing

LTI system theory

10.1115/1.2920141

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Citations (17)