Compliant Offshore Structures

1st Edition - May 27, 1991
Authors: Minoo H Patel, Joel A Witz
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 1 - 6 3 3 2 - 1

Compliant Offshore Structures deals with some aspects of the mechanics of compliant offshore structures. Analysis methods for determining the hydrostatic and hydrodynamic behavior,… Read more

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Compliant Offshore Structures deals with some aspects of the mechanics of compliant offshore structures. Analysis methods for determining the hydrostatic and hydrodynamic behavior, at wave frequencies only, of conventional and novel compliant structure types are described. The contribution of hull configuration for tandem hull vessels and of pneumatic compliances for ship shape and semi-submersible vessels is also emphasized. Comprised of 11 chapters, this book begins with an overview of the various conventional and emerging methods of hydrostatic and hydrodynamic analysis that are available for characterizing compliant marine structures. The response of compliant structures to ocean waves is given emphasis, along with the hydrostatic stability of a compliant vessel. The discussion then turns to the use of analysis methods for a variety of conventional and novel compliant structures such as semi-submersibles, ship forms, tensioned buoyant platforms, crane vessels, and vertical marine risers. However, those compliant structures that are believed to have a future application or, alternatively, are useful in illustrating an interesting performance feature are also considered. Among such structures are those with articulated joints, pneumatic compliances, and tandem hull marine vehicles. This monograph is intended for practicing engineers as well as undergraduate and postgraduate students.

Preface1 Introduction 1.1 Historical Development 1.2 Types of Structures 1.3 General Analysis and Design Requirements2 Ocean Wave Excitation 2.1 Ocean Waves as a Random Process 2.2 Short Term Wave Statistics 2.3 Wave Spectra 2.4 Long Term Wave Statistics 2.5 Wind and Current 2.6 Application of Environmental Spectra3 Hydrostatic Analysis 3.1 Theoretical Background to Pressure Integration Technique for Hydrostatic Analysis 3.2 Classical Hydrostatics 3.3 Pressure Integration Technique4 Dynamic Response Analysis 4.1 Formulation of Governing Equations 4.2 Solution Techniques5 Semisubmersible and Ship Forms 5.1 Introduction 5.2 Morison Equation Based Analysis 5.3 Diffraction Analysis 5.4 Monohull Roll Response 5.5 Design Considerations and Operability 5.6 Concluding Remarks6 Tensioned Buoyant Platforms 6.1 Introduction 6.2 Platform Dynamics 6.3 Tether Dynamics 6.4 Coupling Between Platform and Tether Dynamics 6.5 Model Tests 6.6 Mathieu Instability7 Dynamics of Crane Vessels 7.1 Introduction 7.2 Rigid vessel Wave Induced Forces and Motions 7.3 Coupled Motions of Vessel and Crane Load 7.4 Operability Limits 7.5 Transient Line Tension at Lift-Off8 Tandem Hull Floating Vessels 8.1 Introduction 8.2 Hybrid Hull Characteristics 8.3 Simplified Wave Induced Motions Analysis 8.4 Dynamic Analysis of Tandem Hulls 8.5 Design Considerations9 Articulated Structures 9.1 Introduction 9.2 Design Criteria 9.3 Classical Hydrostatics 9.4 Catastrophic Instability at Large Angles 9.5 Hydrodynamic Response 9.6 Rigid Vessels with Inflected Righting Moment Curves10 Floating Vessels with Trapped Air Cavities 10.1 General Considerations 10.2 Hydrostatic Analysis 10.3 Semisubmersible Vessels 10.4 Tensioned Buoyant Platforms 10.5 Ship Shape Hull Forms 10.6 Active Control of Trapped Air Volumes11 Vertical Marine Risers 11.1 Introduction 11.2 Governing Equations 11.3 Methods of Analysis 11.4 Vortex Shedding Effects 11.5 Design ConsiderationsAppendix Results of Linear Wave TheoryIndex