MATHEMATICAL MODELLING FOR SAFETY EVALUATION OF SHIP STRUCTURES
Main researcher
: SENJANOVIĆ, IVO (57053) Assistants
PUŠIĆ, VELIMIR (67350)
ČORIĆ, VEĆESLAV (77520)
SMILJANIĆ, BRANIMIR (181784)
ŽMIRE, BORIS (181683)
ŽANIĆ, VEDRAN (77913)
BOBANAC, NENAD (147720)
KALINOVČIĆ, HRVOJE (181804)
KOVŠCA-OBSIEGER, JANJA (73523)
FAN, YING (162386)
JANČIJEV, TOMISLAV (63750)
GRUBIŠIĆ, RAJKO (74052)
GRUBIŠIĆ, IZVOR (76234)
ŽIHA, KALMAN (55582)
PARUNOV, JOŠKO (206782)
MRAVAK, ZORAN (900652)
DONKOV, IVICA (900754)
BEGOVIĆ, ERMINA (900837)
Type of research: applied Duration from: 05/01/91. to 12/21/93. Papers on project (total): 100
Papers on project quoted in Current Contents: 15
Institution name: Fakultet strojarsva i brodogradnje, Zagreb (120) Department/Institute: Department of Naval Architecture and Ocean Engineering Address: Ivana Lučića 5 City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 611-19-44
Fax: 385 (0)1 51-45-35
E-mail: VCORIC@uni-zg.ac.mail.hr
Summary: This project consists of three main parts (principal
investigators: (A-V. Čorić, B-I. Senjanović, C-V. Žanić) and grouped into
two projects (1-part B, 2-parts A and C). A-Ship Oscillations on Waves and
Loading of Floating Objects The classification of problems of motions and
loading calculations of ships on waves on the basis of linear theory.
Ordering of existing software on the common data basis. For the solution
of problems of swaying and rolling of ships and their anchoring a
nonlinear theory has been devloped. For the determination of loading of
single and multy hull slender bodies on waves the numerical modelling of
the hydrodynamic forces of the 1st and 2nd order was performed. The
procedure for determination of loading on ship structure caused by
underwater explosion, is analysed. The effects of shock wave and the
gaseous bubble products of such explosion, are treated separately. For
determination of propeller-hull interaction the non-uniform wake in the
plane of propeller, unsteady harmonics of propeller forces and
hull-surface pressure fluctuations are analysed. Numerical methods of
calculation are developed. B- Response (Strength and Vibrations) of Ship
Structures For determination of normal and shear stress distribution over
open and closed ship's cross-sections and their flexural,shear,
torsional and warping stiffness, a higher-order theory of thin walled
girders has been developted. A coresponding computer program for
calculation of that stiffness and of the longitudinal vibrations of
ship's hull of higher-orders has been worked out.In the analaysis of the
transient and nonlinear vibrations of ship's hull new harmonic
acceleration method is developed and the well-known harmonic balanse
method has been improved. These methods are applied to solve the problem
of the ship's stability in rough sea. C- The Assesment of Structural
Safety (Reliability) is based on integration of the following
mathematical models : stohastic loading model, FEM calculation of
structural response, deterministic safety check procedure, calculation of
ultimate strength failure modes, nonlinear procedure for determination of
collapse load, reliability calculation. They are used for
multicriterial decision making via the adaptive generation of
hippersurface of non-dominated designs (based on the Monte Carlo method).
Note: From 1991 until 1994 the principal researcher of the project was
Prof.D.Sc.Josip Uršić.
Keywords: hydrodynamic forces, numerical methods, slender bodies, loading of ship structures, underwater explosion, shock wave, wake field, propeller shaft excitation forces,thin walled girders, effective stiffness, nonlinear vibration, harmonic acceleration method, theory of chaos, ship capsizing, safety, reliability, simulation methods, multicriterial optimisation, Monte Carlo procedure.
Research goals: The development of numerical methods for calculation
of loading on floating objects of arbitrary configurations by regular and
irregular sea waves. Developing the procedure for checking ship's
structure endurance to loads caused by underwater explosion. The
development of method for determination of propeller exciting forces for
ship's vibration calculations.Improvment of the procedure for calculations
of vibrations and stability of ship.To develop the procedure for the
design of more economical ship structures (of less weight and price) with
reliability and safety in the prescribed limits.
COOPERATION - INSTITUTIONS
Name of institution
: MINISTARSTVO POMORSTVA, PROMETA I VEZA Type of institution: State administration Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: PODUZEĆE HRVATSKE CESTE Type of institution: State administration Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: BRODARSKI INSTITUT Type of institution: State institute Type of cooperation: Systematic exchange of information City: 10000 - Zagreb, Croatia
Name of institution
: REGISTRO ITALIANO NAVALE Type of institution: State administration Type of cooperation: Systematic exchange of information City: Genova, Italy
Name of institution
: INGENIEURCENTRUM SCHIFFBAU Type of institution: State institute Type of cooperation: Systematic exchange of information City: Roctock, BR Deutschland
Name of institution
: TECHNICAL RESEARCH CENTRE OF FINLAND Type of institution: State institute Type of cooperation: Systematic exchange of information City: Espo, Finland
Name of institution
: HYNDAI MARITIME RESEARCH INDUSTRIES Type of institution: State institute Type of cooperation: Systematic exchange of information City: Ulasan, Korea
Name of institution
: MODEL BASIN Type of institution: State institute Type of cooperation: Systematic exchange of information City: Berlin, BR Deutschland
Name of institution
: VIRGINIA POLYTECHNIC INSTITUTE AND STATE
UNIVERSITY AEROSPACE & OCEAN ENG. Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: 24061 - Blacksburg Virginia, USA
Name of institution
: DEPARTEMENT OF NAVAL ARCHITECTIRE AND OCEAN
ENG. Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: G12 8QQ - Glasgov, Scotland, UK
Name of institution
: DEPARTMENT OF NAVAL ARCHITECTURE, Kv Levski Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: Varna, Bulgaria
Name of institution
: DEFENCE RESEARCH ESTABLISHMENT ATLANTIC Type of institution: State institute Type of cooperation: Systematic exchange of information City: Dartmouth, Canada
Name of institution
: SUMIMOTO HEAVY INDUSTRIES Type of institution: Economical/Production Type of cooperation: Systematic exchange of information City: Hiratsuka, Japan
Name of institution
: NATIONAL TAIWAN OCEAN UNIVERSITY Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: Keelung, Taiwan
Name of institution
: DET NORSKE VERITAS, Research Department Type of institution: State administration Type of cooperation: Systematic exchange of information City: Oslo, Norway
Name of institution
: UNIVERSITY OF CALIFORNIA,Department of
Naval Architecture and Ocean Engineering Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: Berkely, USA
Name of institution
: NORWEGIAN INSTITUTE OF TECHNOLOGY Type of institution: State institute Type of cooperation: Systematic exchange of information City: Trondheim, Norway
Name of institution
: BUREAU VERITAS, Research & Developing
Centre Type of institution: State administration Type of cooperation: Systematic exchange of information City: Paris, France
Name of institution
: PAUL A FRIEZE & ASSOC. Type of institution: Economical/Production Type of cooperation: Systematic exchange of information City: Twickenheim, UK
Name of institution
: UNIVERSITY OF TRIESTE, Department of Naval
Architecture, Ocean and Environmental Engineering Type of institution: University/Faculty Type of cooperation: Systematic exchange of information City: 34127 - Trieste, Italy Other information about the project.