Download or read book Learning Hydrodynamic Coefficient Databases for Vortex Induced Vibration Prediction of Marine Risers Using Sparse Sensor Measurements written by Andreas P. Mentzelopoulos and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-empirical models are currently the state-of-the-art technology for flexible cylinder vortex induced vibrations (VIV) predictive modelling. Accurate prediction of the structural response relies heavily on the accuracy of the acquired hydrodynamic coefficient database. Due to the large number of inputs required, the construction of systematic hydrodynamic coefficient databases from rigid cylinder forced vibration experiments can be time-consuming or even intractable. An alternative approach has been implemented in this work to improve the flexible cylinder VIV prediction by machine-learning optimal parametric hydrodynamic databases using physical measurements along the structure. The methodology is applied to a straight riser in uniform flow and extended to non-straight riser configurations and non-uniform incoming flow profiles. Moreover, database inference is extended to using direct sparse sensor measurements along the structure. Specifically, a 19-dimensional parametric hydrodynamic coefficient database is obtained for: (i) straight riser in uniform flow (using either displacement or strain data) (ii) straight riser in stepped uniform flow (iii) straight riser in sheared flow (iv) catenary riser in uniform flow of various incidence directions between the catenary plane and the incoming flow stream (v) stepped (2-diameter) riser in uniform flow. The predicted amplitude and frequency responses, using the extracted databases, are compared with observed experimental results.

Download or read book Improving Time domain Prediction of Vortex induced Vibration for Marine Risers written by Boyang Zhang and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As offshore exploration and production is moving into deepwaters, the prediction of the Vortex-Induced Vibration (VIV) of marine risers becomes a critical issue in the design process. VIV can lead to a reduced fatigue life and even the structural failure of the riser. Currently, frequency-domain models are widely used in the offshore industry to predict riser VIV. However, the nonlinearities encountered in complex deepwater environments make linear approaches unreliable. In contrast, time-domain models can capture the nonlinearities in a straightforward manner. In this thesis, a time-domain model was further developed to predict the VIV of both rigid and flexible risers. Through a zero up-crossing analysis of the crossflow displacement, the two state variables, amplitude-to-diameter ratio and reduced velocity, were determined to interpolate the database of hydrodynamic coefficients obtained from forced oscillation tests at high Reynolds numbers. The hydrodynamic forces were then calculated and incorporated into an enhanced global-coordinatebased finite element method program, MAPS-Mooring, to investigate riser behaviours in the time domain. The enhanced program, MAPS-Mooring, comprises a two-stage computation: the riser profile under static equilibrium is first obtained based on a Newton iterative method, and the dynamic profile and tension of the riser are then solved by the second-order semi-implicit Adams method in the time domain. The enhanced program was first validated by using experimental results of mooring line tests in the literature to prove its reliability and robustness. Validation studies were then carried out to the enhanced time-domain VIV model for a rigid riser in a uniform flow and a flexible riser in a step current. Good agreement was observed between the numerical results and the experimental measurements.

Download or read book Numerical Prediction of the Vortex induced Vibrations of Marine Riser written by and published by . This book was released on 2003 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cont This Scatter Diagram Method Could Reduce the Cost of Risers by Reducing the Over Conservatism that is Introduced by the Common Practice of Using an Envelope Design Current Profile It Also Reduces the Analysis Time Required for the Brute Force Approach by Allowing the Designer to Focus on Only the Most Relevant Profiles written by Jessica Mary Donnelly and published by . This book was released on 2004 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a scatter diagram approach for the classification of large numbers of current profiles for use in the prediction of riser fatigue damage due to vortex-induced vibration. Scatter diagrams have long been used to characterize the probability of various combinations of wave height and period, which are then used to assess wave forces. To predict VIV fatigue damage the designer needs to know which current profiles have the combined property of long regions of relatively constant velocity and relatively high speed. A sorting algorithm is proposed which searches every current profile for long regions of relatively constant flow speed. The probability of each length and speed combination is assessed and the data is used to populate the bins of the scatter diagram. The designer need only select relatively few representative profiles for detailed VIV analysis from those bins that would account for the most damage. The method is tested by making comparison to a brute force approach in which each of many thousands of profiles is evaluated for fatigue damage by running it in the SHEAR7 VIV response prediction program.

Download or read book Vortex induced Motions of Marine Risers written by Filippos Chasparis and published by . This book was released on 2009 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Type II responses, on the other hand, are characterized by features of chaotic oscillation with small or non-existent 3rd harmonic components in the acceleration and strain signals, reduced correlation length, and a continuous spectrum.

Download or read book An Investigation of Vortex Induced Vibrations of Subsea Risers and Umbilicals from Offshore Field Measurements written by and published by . This book was released on 2004 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Method for Computation of Integrated Vortex Induced Fluid Loading and Response Interaction of Marine Risers in Waves and Currents written by Hans Tormod Hansen and published by . This book was released on 1988 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prediction of Hydrodynamic Coefficients During Roll Motion of Ship Using RANSE written by Kumar Bappaditya Salui and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Vortex induced Oscillations on the Stress Levels in a Marine Riser written by Rupert Hunt and published by . This book was released on 1981 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Forecasting written by Jacques C. J. Nihoul and published by Elsevier Science & Technology. This book was released on 1979 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Review of the theories of wind-mixed layer deepening / S.A. Kitaigorodskii -- Large scale air-sea interactions and climate predictability / C. Frankignoul -- Low frequency motions in the North Pacific and their possible generation by meteorological forces / I. Magaard -- Wind-induced low-frequency oceanic variability / J. Willebrand and G. Philander -- A discussion of wave prediction in the northwest Atlantic Ocean / C.L. Vincent and D.T. Resio -- Wave height prediction in coastal water of southern North Sea / S. Aranuvachapun -- Correlation between wave slopes and near-surface ocean currents / S. Sethuraman -- The tow-out of a large platform / B. MacMahon -- A hybrid parametrical surface wave model applied to North Sea sea state prediction / H. Günther and W. Rosenthal -- On the fraction of wind momentum retained by waves / M. Donelan -- The NUSC windwave and turbulence observation program (WAVTOP) : a status report / D. Shonting and P. Temple -- A numerical model of longshore current ...

Download or read book Prediction of Vortex induced Fluid Mechanics of Maneuvering Submarines written by Michael R. Mendenhall and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations written by Turgut Sarpkaya and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.

Download or read book Advances in Computer Science for Engineering and Education III written by Zhengbing Hu and published by Springer Nature. This book was released on 2020-08-05 with total page 689 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises high-quality refereed research papers presented at the Third International Conference on Computer Science, Engineering and Education Applications (ICCSEEA2020), held in Kyiv, Ukraine, on 21–22 January 2020, organized jointly by National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, National Aviation University, and the International Research Association of Modern Education and Computer Science. The topics discussed in the book include state-of-the-art papers in computer science, artificial intelligence, engineering techniques, genetic coding systems, deep learning with its medical applications, and knowledge representation with its applications in education. It is an excellent source of references for researchers, graduate students, engineers, management practitioners, and undergraduate students interested in computer science and their applications in engineering and education.

Download or read book Computational and Experimental Simulations in Engineering written by Hiroshi Okada and published by Springer Nature. This book was released on 2019-11-16 with total page 1278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of computational engineering, as presented by leading international researchers and engineers at the 24th International Conference on Computational & Experimental Engineering and Sciences (ICCES), held in Tokyo, Japan on March 25-28, 2019. ICCES covers all aspects of applied sciences and engineering: theoretical, analytical, computational, and experimental studies and solutions of problems in the physical, chemical, biological, mechanical, electrical, and mathematical sciences. As such, the book discusses highly diverse topics, including composites; bioengineering & biomechanics; geotechnical engineering; offshore & arctic engineering; multi-scale & multi-physics fluid engineering; structural integrity & longevity; materials design & simulation; and computer modeling methods in engineering. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaborations.

Download or read book Offshore Pipelines written by Boyun Guo and published by Elsevier. This book was released on 2005-04-25 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offshore Pipelines covers the full scope of pipeline development from pipeline designing, installing, and testing to operating. It gathers the authors' experiences gained through years of designing, installing, testing, and operating submarine pipelines. The aim is to provide engineers and management personnel a guideline to achieve cost-effective management in their offshore and deepwater pipeline development and operations. The book is organized into three parts. Part I presents design practices used in developing submarine oil and gas pipelines and risers. Contents of this part include selection of pipe size, coating, and insulation. Part II provides guidelines for pipeline installations. It focuses on controlling bending stresses and pipe stability during laying pipelines. Part III deals with problems that occur during pipeline operations. Topics covered include pipeline testing and commissioning, flow assurance engineering, and pigging operations. This book is written primarily for new and experienced engineers and management personnel who work on oil and gas pipelines in offshore and deepwater. It can also be used as a reference for college students of undergraduate and graduate levels in Ocean Engineering, Mechanical Engineering, and Petroleum Engineering. * Pipeline design engineers will learn how to design low-cost pipelines allowing long-term operability and safety. * Pipeline operation engineers and management personnel will learn how to operate their pipeline systems in a cost effective manner. * Deepwater pipelining is a new technology developed in the past ten years and growing quickly.

Download or read book Linear Time varying Approximations to Nonlinear Dynamical Systems written by Maria Tomas-Rodriguez and published by Springer Science & Business Media. This book was released on 2010-02-04 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear, Time-varying Approximations to Nonlinear Dynamical Systems introduces a new technique for analysing and controlling nonlinear systems. This method is general and requires only very mild conditions on the system nonlinearities, setting it apart from other techniques such as those – well-known – based on differential geometry. The authors cover many aspects of nonlinear systems including stability theory, control design and extensions to distributed parameter systems. Many of the classical and modern control design methods which can be applied to linear, time-varying systems can be extended to nonlinear systems by this technique. The implementation of the control is therefore simple and can be done with well-established classical methods. Many aspects of nonlinear systems, such as spectral theory which is important for the generalisation of frequency domain methods, can be approached by this method.

Download or read book Well Completion Design written by Jonathan Bellarby and published by Elsevier. This book was released on 2009-04-13 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completions are the conduit between hydrocarbon reservoirs and surface facilities. They are a fundamental part of any hydrocarbon field development project. The have to be designed for safely maximising the hydrocarbon recovery from the well and may have to last for many years under ever changing conditions. Issues include: connection with the reservoir rock, avoiding sand production, selecting the correct interval, pumps and other forms of artificial lift, safety and integrity, equipment selection and installation and future well interventions. Course book based on course well completion design by TRACS International Unique in its field: Coverage of offshore, subsea, and landbased completions in all of the major hydrocarbon basins of the world Full colour