NDLI: Approximation of Crossing Intensities for Non Linear Responses Subjected to Non Gaussian Loadings

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Galtier, Thomas Gupta, Sayan Rychlik, Igor
Copyright Year	2010
Abstract	Crossing intensity constitute an important response characteristic for randomly vibrating structures, especially if one is interested in estimating the risk against failures. This paper focusses on developing approximations by which estimates of the crossing intensities for response of marine structures can be obtained in a computationally efficient manner, when the loads are modeled as a special class of non-Gaussian processes, namely as LMA processes. Ocean waves exhibit considerable non-Gaussianity as marked by their skewed marginal distributions and heavy tails. Here, a new class of processes-the Laplace driven Moving Average (LMA) processes are used to model the ocean waves. LMA processes are non-Gaussian, strictly stationary, can model in principle any spectrum and have the additional flexibility to model the skewness and the kurtosis of the marginal distribution. The structure behavior assumed is limited to quadratic systems characterized by second order kernels, which is common for marine structures. Thus, an estimation of the crossing intensities of the response involves studying the crossing characteristics of a LMA process passing through a second order filter. A new computationally efficient hybrid method, which uses the saddle point approximations along with limited Monte Carlo simulations, is developed to compute crossing intensity of the response. The proposed method is illustrated through numerical examples.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	109
Ending Page	121
Page Count	13
File Format	PDF
ISBN	9780791849101
DOI	10.1115/OMAE2010-20114
e-ISBN	9780791838730
Volume Number	29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2
Conference Proceedings	ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2010-06-06
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Filters Approximation Simulation Marine structures Ocean waves Risk Engineering simulation Failure Stress
Content Type	Text
Resource Type	Article

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