Direct Wave-Drive Thruster

Abstract The scope of this paper is to provide a method implemented in an application for assessment of dynamic response of free spanning pipelines subjected to combined wave and current loading. The premises for the paper are based on application development within pipeline free span evaluation in a software development project. A brief introduction is provided to the basic hydrodynamic phenomena, principles and parameters for dynamic response of pipeline free spans. The choice of method for static and dynamic span modelling has an influence on calculated modal frequencies and associated stresses. Due to the importance of frequencies and stresses for fatigue and environmental loading calculations, the choice of analysis approach influences the partial safety factor format. The aim of the structural analysis is to provide the necessary input to the calculations of VIV and force model response, and to provide realistic estimations of static loading from functional loads. Environmental flow conditions are implemented in the application, such as steady flow due to current, oscillatory flow due to waves and combined flow due to current and waves. Combined wave and current loading include the long-term current velocity distribution, short-term and long-term description of wave-induced flow velocity amplitude and period of oscillating flow at the pipe level and return period values. Inline and cross-flow vibrations are considered in separate response models. For pipelines and risers, modes are categorized in in-line or cross-flow direction. A force model is also considered for the short-term fatigue damage due to combined current and direct wave actions. Design criteria can be specified for ultimate limit state (ULS) and fatigue limit state (FLS) due to in-line and cross-flow vortex induced vibrations (VIV) and direct wave loading.

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Reconstruction of a rough surface profile with an iterative method based on a rigorous direct wave scattering model

2011 XXXth URSI General Assembly and Scientific Symposium ◽

10.1109/ursigass.2011.6050373 ◽

2011 ◽

Author(s):

Gabriel Soriano ◽

Slimane Arhab ◽

Kamal Belkebir

Keyword(s):

Iterative Method ◽

Rough Surface ◽

Wave Scattering ◽

Surface Profile ◽

Direct Wave ◽

Scattering Model

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The Design of Shear Wave Drive Device in Magnetic Resonance Elastography

2011 5th International Conference on Bioinformatics and Biomedical Engineering ◽

10.1109/icbbe.2011.5780456 ◽

2011 ◽

Author(s):

Qite Chen ◽

Pengde Wang ◽

Chao Li ◽

Hongzhi Wang ◽

Xuelong Zhang

Keyword(s):

Magnetic Resonance ◽

Shear Wave ◽

Magnetic Resonance Elastography ◽

Wave Drive

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