# Dynamics of Ocean Structures

IIT Madras, , Prof. Srinivasan Chandrasekaran

IIT Madras, , Prof. Srinivasan Chandrasekaran

Contents:

Introduction to different types of ocean structures - Development of structural forms for deep and ultra-deep waters - Environmental forces - structural action of ocean structures - fluid-structure interaction - Introduction to structural dynamics - Characteristics of single degree-of-freedom model - Methods of writing equation of motion - comparison of methods - Free and forced vibration of single degree-of-freedom systems - Undamped and damped systems - Formulation of equation of motion - examples - Coulomb damping - comparison of damped and undamped forced vibration - response build up - Numerical problems in single degree-of-freedom systems - Two degrees-of-freedom systems.

Formulation of equation of motion - Eigenvalues and eigenvectors - Orthogonality of modes - Study of multi degrees-of-freedom systems - Equations of motion - Natural frequencies and mode shapes - Stodla, Rayleigh-Ritz and influence coefficient methods, Dunkerley - Matrix methods for dynamic analysis - Eigen solution - Modal analysis - Structural action of offshore structures - Types of offshore structures based on the geometric form - Development of structural form for deep waters - Fluid-structure interaction - Dynamic analysis of offshore jacket platforms - steps of analysis using software - Dynamic analysis of articulated towers - Iterative frequency domain - Multi-legged articulated towers - Response control of multi-legged articulated towers using tuned mass dampers - Experimental and analytical studies on MLAT - Development of Tension Leg Platforms and geometric optimization - Dynamic analyses of TLPs

Development of Mass, stiffness and damping matrices of TLP from first principles - Dynamic analysis methodology of offshore structures under earthquakes - TLPs under seismic excitation - Development of new generation offshore structures - Buoyant Leg Structures and offshore triceratops - Numerical modeling of offshore triceratops using software - Comparison of experimental, analytical and numerical studies on offshore triceratops - Estimate of damping: Classical damping, Rayleigh and Caughey - Damping by mode superposition - Analytical technique to solve equation of motion using in Newmarks Beta method - Introduction to stochastic dynamics of ocean structures - Random environmental processes - Stationary process - Response spectrum - Narrow band process - Return period - Fatigue prediction - Modal response method - Modal mass contribution - Missing mass correction, Example problems - Duhamel's integrals

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4.1 ( 11 )

Dynamics of Ocean Structures by Dr. Srinivasan Chandrasekaran, Department of Ocean Engineering, IIT Madras. For more details on NPTEL visit httpnptel.iitm.ac.in

Sam

Sep 12, 2018

Excellent course helped me understand topic that i couldn't while attendinfg my college.

Dembe

March 29, 2019

Great course. Thank you very much.