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The course will give a brief overview of different types of ocean structures that are deployed in sea for exploiting oil, gas and minerals. While fundamentals of structural dynamics are discussed, detailed mathematical modeling of ocean structures and their dynamic analysis under waves, wind and current are highlighted with special emphasis to fluid-structure interaction. Introduction to stochastic dynamics of ocean structures is also discussed with lot of tutorials and sample papers that shall initiate self-learning through the course. Focus is on the explanation of fundamental concepts as addressed to graduate students. 

 

Week. No

Topics

1.

Fundamentals of Structural dynamics - 5 weeks ( 4 days a week)

  • Introduction to different types of ocean structures
  • Development of structural forms for deep and ultra-deep waters
  • Environmental forces
  • structural action of ocean structures
  • 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
  • Estimate of damping: Classical damping, Rayleigh and Caughey
  • Damping by mode superposition
  • 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
  • Modal response method
  • Modal mass contribution
  • Missing mass correction, Example problems
  • Duhamel's integrals

2.

Application of structural dynamics to offshore structures: 5 weeks (4 days a week)

  • Fluid-structure interaction
  • Dynamic analysis of offshore jacket platforms
  • Dynamic analysis of articulated towers
  • Iterative frequency domain
  • Multi-legged articulated towers(MLAT)
  • 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 earthquake loads
  • TLPs under seismic excitation
  • Development of new generation offshore structures
  • Buoyant Leg Structures and offshore triceratops
  • Comparison of experimental, analytical and numerical studies on offshore triceratops
  • Dynamic analysis of compliant offshore structures under extreme waves (springing and ringing responses)
  • Stability analysis of offshore compliant structures
  • Hydrodynamic performance of perforated cylinders under regular waves
  • Structural health monitoring of offshore platforms using WSN (wireless sensor networking)
  • Retrofitting and rehabilitation of offshore structures
  • Dynamic analysis of large floating structures: Buoyant leg supported regasification platforms

3.

Introduction to stochastic dynamics: 3 weeks (4 days a week)

  • Introduction to stochastic dynamics of ocean structures
  • Random environmental processes
  • Stationary process
  • Response spectrum
  • Narrow band process
  • Return period
  • Fatigue prediction

UG/PG/Ph.D of all engg branches and PG of applied sciences; Diploma students can also register



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