Σύνδεση Μελών

Σύνδεση με προνόμια ΕΛ.Ι.Ν.Τ.

Structural Monitoring of Ships’ Hulls Using Optical Sensors

Manolis S.Samuelides, Nicholas G. Tsouvalis & Dimitris Dimou.
National Technical University of Athens, Greece

Andrea M.Ferrari
D'Appolonia S.p.A., Italy

Alessandro Grasso
Registro Italiano Navale

Summary
The paper describes a system including hardware and software elements for the health monitoring of ships’ hulls. Hardware elements are the sensors, the transmission line and the reading unit and switch. The software is designed to present the user with information concerning the health of the structure on the basis of the readings obtained from the sensors. The system has been applied in a bulk carrier and a tug boat operating in the gulf of Tallinn. Initial readings from the latter system have been obtained and currently investigated. The initial readings indicate that the structure of the tug does not suffer high stresses under normal operating conditions. The work is performed within the MOSES project -  Innovative continuum Multiplex Optical Sensors hull stress monitoring system, which is a two-years project started in October 2008 and carried out within the framework of the European Commission FP7 program, Research for the benefit of SMEs.

 

The MOSES project

More than 4500 total ship losses were recorded worldwide in the period from 1994 to 2002: a significant percentage of such incidents are caused by structural problems. Hull stresses due to loading, or stresses imparted by wave and adverse weather conditions constitute primary source of risk to all types of ships with a large hull. Bulk carriers, large oil tankers [1] & [2], containers carriers, LNG carriers, and RoRo are vessel types particularly subject to such type of risks. The concept of MOSES project - Innovative continuum Multiplex Optical SEnsors hull Stress monitoring system - is to apply highly knowledge-based methods to achieve control of loads in the whole extension of the ship hull, using temperature compensated laser based optical sensors. The project objectives involve a) sensor development, b) FEM Structural Calculations and c) data conditioning, to grant the applicability to the widest types of ships. Sensor fusion concept is adopted to integrate strain gauges, accelerometers and inclinometers in a common optical-fibre based architecture, capable of providing instantaneous information concerning the dynamic status of the ship. The sensors have to meet the stringent requirements of the working environment, in terms of ruggedness, reliability, response accuracy, resistance to electromagnetic interference and multiplex connection capability. The expected benefits are associated to immediate increase in safety of the ship where they are installed, during loading as well as in shipping conditions, reduction of casualties, extended service life of vessel, and targeted maintenance directed to overcome the damages detected by the monitoring system.

The development of the sensors for strain, acceleration and inclination measurement is based on laser signal transmission with optical fibres, exploiting Fibre Bragg Grating (FBG) or Fabry-Perot interferometer diffraction effect, a technology already in application in other fields [3] like civil engineering, [4] & [5] and composite materials structural monitoring [6] & [7]. The sensors are designed to monitor in real time the strain in different points of the structure, and provide: ....

Το πληρες άρθρο είναι διαθέσιμο μόνο για τα μέλη ΕΛ.Ι.Ν.Τ.
Αν είστε μέλος παρακαλούμε συνδεθείτε με τον κωδικό σας.
Για να γίνετε μέλος ΕΛ.Ι.Ν.Τ. ακολουθήστε τις οδηγίες στις Εγγραφές Μελών
Τετάρτη, 24 Απριλίου 2013

TRAINING WORKSHOP, ΠΟΥ ΟΡΓΑΝΩΘΗΚΕ ΑΠΟ «ΕΛΙΝΤ» / «MAR.TEC.M.A.» / «Ε.Ε.Δ.Ε.» ΣΤΙΣ 19 & 20 ΑΠΡΙΛΙΟΥ 2013, ΣΤΑ ΠΛΑΙΣΙΑ ΤΩΝ ΕΚΔΗΛΩΣΕΩΝ:
«ΗΦΑΙΣΤΟΣ 2013» / ΑΘΗΝΑ & «HE.M.E.EXPO. 2013» / ΣΑΓΚΑΗ

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