Process of deploying wireless sensor network in offshore structures for structural health monitoring is presented in this paper. Offshore structures are subjected to environmental loads with high uncertainties that are capable of causing damage during their service life. Preventive measures to safeguard the offshore platforms from such damages are not only innovative but also inevitable. Structural damages can be readily identified by monitoring their response behavior deploying dense array of sensors. Deploying wireless structural health monitoring (SHM) system ensures reduced installation time, compact design and cost reduction in comparison to that of the traditional wired systems. Wireless sensor network architecture for monitoring offshore platforms, proposed in the present study will acquire data using network of sensor nodes and transmits to the base station for post-processing. Present study compares the structural responses of offshore tension leg platform under different postulated failure cases through experimental investigations on scaled model. Acquired data are also hosted in the webpage after analyzing and post-processing. The alert monitoring system, which is an integral part of SHM triggers alert messages is an indigenous design. © 2018, JASNAOE.

Srinivasan Chandrasekaran

Department of Ocean Engineering

Thailammai Chithambaram

Cost reduction

Monitoring

Network architecture

OFFSHORE OIL WELLS

OFFSHORE STRUCTURES

Sensor nodes

TENSION-LEG PLATFORMS

wireless sensor networks

Condition-based monitoring

ENVIRONMENTAL LOADS

Experimental investigations

OFF SHORE PLATFORMS

Preventive measures

RESPONSE ANALYSIS

WIRELESS SENSOR NETWORKINGS

WIRELESS STRUCTURAL HEALTH MONITORING

Structural health monitoring

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Marine Science and Technology (Japan)

Response control of offshore tension leg platforms (TLP) using a passive damper is studied. The study is attempted to control the large surge motion of a TLP. Tuned mass damper (TMD) is used for the control purpose as it effectively controls the motion of the primary structure under the lateral loads. Experimental investigations are carried out on a scaled model of TLP with TMD under regular waves to examine the effectiveness of TMD in controlling the surge response of TLP. TMDs with two different mass ratios, which are tuned to that of the structural characteristics of TLP model, are used in the study. Based on the studies conducted, it is seen that there is an effective control of surge response in certain bandwidths of wave periods under the chosen mass ratio. It is also seen that the presence of TMD controls heave and pitch response as well in addition to exhibiting reduction in tether tension variation. Attempted study is novel in terms of its application to offshore compliant structures although TMDs are commonly used in the response control of onshore structural systems. © 2016 Informa UK Limited, trading as Taylor &amp; Francis Group.

Ships and Offshore Structures

Response control of tension leg platform with passive damper: experimental investigations

This book addresses the concepts of material selection and analysis, choice of structural form, construction methods, environmental loads, health monitoring, non-destructive testing, and repair methodologies and rehabilitation of ocean structures. It examines various types of ocean and offshore structures, including drilling platforms, processing platforms and vessels, towers, sea walls and surge barriers, and more. It also explores the use of MEMS in offshore structures, with regard to military and oil exploration applications. Full-color figures as well as numerous solved problems and examples are included to help readers understand the applied concepts. © 2017 by Taylor &amp; Francis Group, LLC.

Ocean Structures: Construction, Materials, and Operations

Ocean structures: Construction, materials, and operations

This book attempts to provide readers with an overall idea of various types of offshore platform geometries. It covers the various environmental loads encountered by these structures, a detailed description of the fundamentals of structural dynamics in a class-room style, estimate of damping in offshore structures and their applications in the preliminary analysis and design. Basic concepts of structural dynamics are emphasized through simple illustrative examples and exercises. Design methodologies and guidelines, which are FORM based concepts are explained through a few applied example structures. Each chapter also has tutorials and exercises for self-learning. A dedicated chapter on stochastic dynamics will help the students to extend the basic concepts of structural dynamics to this advanced domain of research. Hydrodynamic response of offshore structures with perforated members is one of the recent research applications, which is found to be one of the effective manner of retrofitting offshore structures. Results of recent research, validated by the experimental and numerical studies are presented to update of the readers. Integration of the concepts of structural dynamics with the FORM-evolved design of offshore structures is a unique approach used in this book. The book will prove useful to the practicing and consulting offshore structural engineers, as also to students and researchers working in the field. © Springer India 2015.

Dynamic Analysis and Design of Offshore Structures

Dynamic analysis and design of offshore structures

Recent observations of the sea state that result in the undesirable events confirm the presence of extreme waves like freak waves, which is capable of causing irreparable damages to offshore installations and (or) create inoperable conditions to the crew on board. Knowledge on the extreme wave environment and the related wave-structure interaction are required for safer design of deep-water offshore structures. In the current study, typical long crested extreme waves namely: i) New Year wave at offshore Norway; and ii) Freak wave at North Sea are simulated using the combined wave model. Dynamic response of the Tension Leg Platforms (TLP) under these extreme waves is carried out for different wave approach angles. Based on the analytical studies carried out, it is seen that the TLPs are sensitive to the wave directionality when encountered by such extreme waves; ringing type response is developed in TLPs which could result in tether pull out. © 2013 ANAME Publication. All rights reserved.

Fulltext

Journal of Naval Architecture and Marine Engineering

Dynamic analysis of a Tension Leg Platform under extreme waves

Offshore Structural Engineering

Structural Reliability Theory

Health monitoring of tension leg platform using wireless sensor networking: experimental investigations

Journal	Data powered by TypesetJournal of Marine Science and Technology (Japan)
Publisher	Data powered by TypesetSpringer Tokyo
ISSN	09484280
Open Access	No