SVIBOR - Papers - project code: 2-09-331

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Published papers on project 2-09-331


Quoted papers: 0
Other papers: 18
Total: 18


  1. Type of paper: Paper in journal

    Title:


  2. Type of paper: Paper in journal

    Title:

    Authors:
    BOBANAC, NENAD (147720)
    Journal: Brodogradnja
    Number: 3-4
    ISSN: 0007-215X
    Volume: 40
    Year: 1992
    Pages: from 117 to 120
    Language: engleski
    Summary: A method and equipment for the observation of full scale marine propeller cavitation on a fast small ship is presented. The design of observing windows enables their relatively cheap and fast mounting-dismounting without having expensive ship docking. The window with an optical prism flat with bottom plating improves view angles without disturbing the ship wake, and can be successufully used for photographing of full scale marine propeller cavitation. The method allows easier and cheaper collecting of full scale cavitation pattern data.
    Keywords: ship propeller cavitation

  3. Type of paper: Paper in journal

    Title:

    Authors:
    GRUBIŠIĆ, RAJKO (74052)
    BOBANAC, NENAD (147720)
    SENJANOVIĆ, IVO (57053)
    Journal: Brodogradnja
    Number: 2
    ISSN: 0007-215X
    Volume: 42
    Year: 1994
    Pages: from 140 to 149
    Language: engleski
    Summary: An integral ship vibration prediction procedure consisting of vibration analysis during the design stage is presented. For the vibration analysis the finite element method was employed. By means of 1D, 2D and 3D models basic hull girder vibration, coupled hull-superstructure vibration due to propeller excitation and vibration of the system after body-main engine-superstructure due to engine excitation, respectively, was investigated.
    Keywords: ship vibration, ship vibration prediction

  4. Type of paper: Paper in journal

    Title:

    Authors:
    BOBANAC, NENAD (147720)
    GRUBIŠIĆ, RAJKO (74052)
    SENJANOVIĆ, IVO (57053)
    Journal: Brodogradnja
    Number: 2
    Volume: 42
    Year: 1994
    Pages: from 221 to 331
    Language: engleski
    Summary: The vibration measurements consisting of excitation test and ship trials measurements were compared with 1D, 2D and 3D FEM model calculation results. Correlation of measurement results from excitation tests and ship trials results was done. Many valuable conclusions were made.
    Keywords: ship vibration, ship vibration measurement, ship vibration prediction

  5. Type of paper: Paper in journal

    Title:

    Authors:
    SENJANOVIĆ, IVO (57053)
    FAN, YIN
    Journal: Computers & Structures
    Number: 1
    ISSN: 0045-7949
    Volume: 43
    Year: 1992
    Pages: from 31 to 52
    Number of references: 27
    Language: engleski
    Summary: A new flexural and torsional theory of thin-walled girders is presented by introducing the concept of effective stiffness and mass parameters as modal quantities. For this purpose a rather simple vibration analysis of simple supported girders is performed. Due to sinusoidal modes the problem is reduced to the girder cross-section plane. The stiffness and mass properties are determined from equivalence of girder deformation energy and inertia work, respectively and its beam idealization that results in the same natural frequencies. Therefore, this beam theory is more accurate than the classical one. For practical reasons the finite element formulation is applied, employing orthotropic strip elements that are necessary for the ship structures. The developed computer program is tested in case of a square tube and a channel girder. For illustration, analysis of a container ship midship section is performed.
    Keywords: ship structure, ship vibration, thin-walled girder

  6. Type of paper: Paper in proceedings

    Title: Ship screw propeller cavitation recording with angle sampling control

    Authors:
    BOBANAC, NENAD (147720)
    VIČIĆ, DARKO
    Editors
    VIDMAR, BRANKO
    Proceedings title: 35. Međunarodni simpozij ELMAR-a ZADAR
    Language: hrvatski
    Place: Zadar
    Year: 1993
    ISBN/ISSN: 1330-092X
    Pages: from 266 to 269
    Meeting: 35. Međunarodni simpozij ELMAR-a ZADAR
    Held: from 09/20/93 to 09/22/93
    Summary: A method of magnetic, video and photo recording of ship screw propeller cavitation is presented. A device developed for generating a set of triggering signals following the angle position of a rotating propeller is described. The method is employed for postdetectional A/D conversion synchronized with the rotational speed and angle position of the rotating propeller, for the complete restoration of pressure pulse signals induced by a cavitating propeller revolution by revolution, and for the correlation between video records and hull pressure pulse records.
    Keywords: ship propeller cavitation, propeller excitation

  7. Type of paper: Paper in proceedings

    Title:

    Authors:
    SMILJANIĆ, BRANIMIR
    BOBANAC, NENAD (147720)
    SENJANOVIĆ, IVO (57053)
    Proceedings title: Proc. of the International Conference on Hydroelasticity in Marine Technology
    Language: engleski
    Place: Trondheim, Norway
    Year: 1994
    Meeting: International Conference on Hydroelasticity in Marine Technology
    Held: from 05/25/94 to 05/27/94
    Summary: The theory of interaction of an underwater explosion gas bubble with a nearby ship hull structure is outlined. The excitation due to bubble pulsation is determined for two types of explosive on the basis of the bubble pulsation theory, using the pulsation period measurement results. The numerically obtained dependence of the maximum bending moment on the mass and depth of explosive for two different ship hulls is discussed.
    Keywords: underwater explosion, effect of underwater explosion on ship hull

  8. Type of paper: Paper in proceedings

    Title:

    Authors:
    BOBANAC, NENAD (147720)
    Editors
    ANDROČEC, VLADIMIR
    LOVRIĆ, JOSIP
    Proceedings title: Proc. of the 7th Congress of the Int. Maritime Association of Mediterranean
    Language: engleski
    Place: Dubrovnik
    Year: 1995
    ISBN/ISSN: 953-6017-02-4
    Pages: from 863 to 870
    Meeting: 7th Congress of the International Maritime Association of the Mediterranean
    Held: from 04/23/95 to 04/27/95
    Summary: The interactive software package HULPRES is developed for statistical analyses based on one propeller revolution signal length. The Gaussian and Rayleigh distributions are at disposal for matching. The algorithm and the possibilities of the HULPRES are described. The full scale and model scale experimental results show that the hypothesis of normal distribution is not generally valid. In the majority of cases when harmonics are not normally distributed the Rayleigh distribution is the best choice.
    Keywords: propeller induce hull pressures, statistical analysis of hull pressures

  9. Type of paper: Paper in proceedings

    Title:

    Authors:
    RADANOVIĆ, BOŽIDAR (112954)
    Editors
    ANDROČEC, VLADIMIR
    LOVRIĆ, JOSIP
    Proceedings title: Proc. of the 7th Congress of the Int. Maritime Association of the Mediterranean
    Language: engleski
    Place: Dubrovnik
    Year: 1995
    ISBN/ISSN: 953-6017-02-4
    Pages: from 871 to 880
    Meeting: 7th Congress of the International Maritime Association of the Mediterranean
    Held: from 04/23/95 to 04/27/95
    Summary: A review of the influence of complex ship structure on sound transmission through it is given. Empirical models of sound propagation are presented as the basis for preliminary prediction in the early stage of ship design. Some special means of additional structure-borne sound reduction are described.
    Keywords: ship noise, sound transmission via ship structure

  10. Type of paper: Paper in proceedings

    Title:

    Authors:
    JURAS, KRSTE (143135)
    Editors
    ANDROČEC, VLADIMIR
    LOVRIĆ, JOSIP
    Proceedings title: Proc. of the 7th Congress of the Int. Maritime Association of the Mediterranean
    Language: engleski
    Place: Dubrovnik
    Year: 1995
    ISBN/ISSN: 953-6017-02-4
    Pages: from 798 to 808
    Meeting: 7th Congress of the International Maritime Association of the Mediterranean
    Held: from 04/23/95 to 04/27/95
    Summary: During preliminary design of a large container vessel, the problem of possible too high noise levels in accommodation spaces was noticed. Namely, the accommodation area was situated in the close vicinity of a powerful main engine/propeller and a few diesel generators. Besides, the engine exhaust system was passing through some superstructure decks, which caused an additional problem. The author, on the basis of his own investigations mainly, made the noise prediction calculation and designed the acoustical treatment of the accommodation and working spaces. The noise measurements performed onboard the first vessel completely confirmed the prediction, the noise levels being below the permissible levels speci-fied by the shipowner. This served as the basis for some local interventions on the ship structure and accommodation onboard the sister ship, which resulted in additional noise reduction.
    Keywords: ship noise, ship noise control

  11. Type of paper: Paper in proceedings

    Title: Locally applied noise control measures in ship spaces

    Authors:
    RADANOVIĆ, BOŽIDAR (112954)
    MIRKOVIĆ, GORAN (143146)
    Editors
    VIDMAR, BRANKO
    Proceedings title: 35. Međunarodni simpozij ELMAR-a ZADAR, Zbornik radova
    Language: hrvatski
    Place: Zadar
    Year: 1993
    ISBN/ISSN: 1330-092X
    Pages: from 292 to 295
    Meeting: 35. Međunarodni simpozij ELMAR-a ZADAR
    Held: from 09/20/93 to 09/22/93
    Summary: The necessity and effectivness of locally applied noise control measures in ship spaces is analysed. Predicted and measured noise levels are compared on several examples.
    Keywords: ship noise, noise control in ship spaces

  12. Type of paper: Paper in proceedings

    Title: Forced torsional vibration of the ship propulsion system

    Authors:
    MUTEVELIĆ, DAMIR (181725)
    Editors
    VIDMAR, BRANKO
    Proceedings title: 35. Međunarodni simpozij ELMAR-a ZADAR, Zbornik radova
    Language: hrvatski
    Place: Zadar
    Year: 1993
    ISBN/ISSN: 1330-092X
    Pages: from 285 to 291
    Meeting: 35. Međunarodni simpozij ELMAR-a ZADAR
    Held: from 09/20/93 to 09/22/93
    Summary: Torsional vibration measurement methods are introduced, and the review of the torsional vibration problems relating to ship propulsion systems is given. The method of measuring torsional vibration using strain gauges is presented, and the analysis of the torsional vibration results is illustrated on one example. The forced torsional vibration calculation method used for defining additional torsional stresses in all the parts of the propulsion system on the basis on the measurement results is presented in the same example.
    Keywords: torsional vibration of the ship propulsion system

  13. Type of paper: Paper in proceedings

    Title: Screw propeller influence on noise in smaller ships

    Authors:
    JURAS, KRSTE (143135)
    Editors
    VIDMAR, BRANKO
    Proceedings title: 35. Međunarodni simpozij ELMAR-a, Zbornik radova
    Language: hrvatski
    Place: Zadar
    Year: 1993
    ISBN/ISSN: 1330-092X
    Pages: from 313 to 315
    Meeting: 35. Međunarodni simpozij ELMAR-a ZADAR
    Held: from 09/20/93 to 09/22/93
    Summary: The results of researching the screw propeller as a source of noise in accommodation spaces of smaller ships are given. Some noise influencing propeller parameters like transmitted power, RPM and clearance are preliminary analysed.
    Keywords: ship noise, ship propeller noise

  14. Type of paper: Paper in proceedings

    Title:

    Authors:
    RADANOVIĆ, BOŽIDAR (112954)
    Editors
    VIDMAR, BRANKO
    MEDVED ROGINA, BRANKA
    RADANOVIĆ, BOŽIDAR (112954)
    Proceedings title: Proc. of the 37th International Symposium Electronics in Marine
    Language: engleski
    Place: Pula
    Year: 1995
    ISBN/ISSN: 1330-092X
    Pages: from 47 to 51
    Meeting: 37th ELMAR International Symposium
    Held: from 09/18/95 to 09/20/95
    Summary: Ventilation and exhaust systems are sources of considerable noise on board ships and in many other structures. In this paper typical acoustical filters applied for noise reduction in ventilation and exhaust duct systems are described.
    Keywords: noise silencers, mufflers

  15. Type of paper: Paper in proceedings

    Title:

    Authors:
    JURAS, KRSTE (143135)
    Proceedings title: Proceedings of the PRADS'92
    Language: engleski
    Place: Newcastle upon Tyne, Vel. Britanija
    Year: 1992
    Meeting: PRADS'92 - Practical Design of Ships and Mobile Units
    Summary: Very high noise levels were measured onboard a powerful tug during the trial. Due to technical reasons, acoustical treatment was undertaken on the sister ship. The treatment included fitting of viscoelastic layers, floating floors and sound absorptive ceilings. On the basis of the obtained results the treatment was improved on the first ship during inspection and testing. Although the treatment of noise sources was not feasible, the results of the noise reduction were impressive - nearly 10 dBA in some accommodation spaces. The focus of the paper is on the real assessment of damping materials efficiency, particularly in comparison with some conventional treatment solutions.
    Keywords: ship noise, ship noise control

  16. Type of paper: Paper in proceedings

    Title: Noise reduction of hydraulic systems

    Authors:
    RADANOVIĆ, BOŽIDAR (112954)
    Editors
    VIDMAR, BRANKO
    Proceedings title: 36. Međunarodni simpozij ELMAR-a, Zbornik radova
    Language: hrvatski
    Place: Zadar
    Year: 1994
    ISBN/ISSN: 1330-092X
    Pages: from 9 to 12
    Meeting: 36. Međunarodni simpozij ELMAR-a ZADAR
    Held: from 09/12/94 to 09/14/94
    Summary: Hydraulic systems are sources of considerable noise on board ships. Hydraulics noise generation and control using various silencing measures are described. A design method for an acoustical pipe silencer is presented.
    Keywords: hydraulic system noise, hydraulic noise silencers

  17. Type of paper: Summary in proceedings

    Title:

    Authors:
    RADANOVIĆ, BOŽIDAR (112954)
    Proceedings title: 14th Int. Congress on Acoustics, Acustica, Vol. 76, 1992, Supplement to No. 4
    Language: engleski
    Place: Stuttgart, SR Njemačka
    Year: 1992
    ISBN/ISSN: 0942-0770
    Pages: from 109 to 109
    Meeting: 14th International Congress on Acoustics
    Held: from 09/03/92 to 09/10/92
    Summary: The majority of mechanical structures such as ships and other vehicles, as well as some machines and buildings are made of ribbed plates composed of rectangular panel elements. A method for the estimation of sound radiation from such plates is derived. The method is based on Maidanik's approximate analytical expressions for multimode radiation caused by broad-band mechanical excitation modified according to empirical data. The applicability of the method is checked on some practical examples.
    Keywords: sound radiation, ship noise

  18. Type of paper: Technical report

    Title:

    Authors:
    VLAŠIĆ, DALIBOR (181815)
    Ordering party: Brodogradilište "GREBEN"
    Institution depot: Brodarski institut
    Year: 1992
    Number of pages: 25
    Language: engleski
    Summary: The aim of acceleration measurements on the free-fall lifeboat model and prototype during its launching is the determination of the hull and crew loading caused by an impact of the boat with the water surface. For that reason the level of the acceleration has to be measured at the most critical seat location in all three main directions. During the development of a free-fall lifeboat it is possible to predict the level of acceleration of full-scale lifeboat with tests carried out on the model.
    Keywords: free-fall lifeboat, shock measurements on free-fall lifeboat


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