Calculation reliability of natural vibrations of ship hull and superstructure

• Autorzy: Doan Do Van , Murawski Lech

Identyfikatory

DOI

10.2478/kones-2019-0004

• Języki publikacji: EN

Abstrakty

EN

The ship hull vibration has a great impact on the performance, safety of the devices, structures, and the sailor's comfort when working on the ship. With increases in ship sizes and speeds, shipboard vibration becomes a significant concern in the design and construction of ships. Therefore, designing a ship without any excessive vibration is an important issue and should be studied through analysis right in the design phase. To ensure minimum vibration in a proposed new design; avoid damage to structures, machinery or equipment (mechanically suitable); meeting the requirements of the crew's living environment and working conditions. The ship's natural vibrations are determined to right from the design stage, which will help ship designers and structures avoid dangerous resonance areas. In this study, a three-dimensional finite element model representing the entire ship hull, including the deckhouse and machinery propulsion system, has been developed using numerical modelling implemented in Patran-Nastran software for local and global vibration analyses of the container ship 2000 TEU. Vibration analyses have been conducted under two conditions: free– free (dry) and in-water (wet). The wet analysis has been implemented using Mfluid elements in Nastran software. Because of the global ship free vibration analysis, global natural frequencies and mode shapes have been determined. Combined with the frequency of the main engine and the propeller, the resonant regions with higher frequencies are determined by the resonant graph of the hull. The application of the finite element method for ship vibration analysis shows the optimal of numerical modelling method compared to other traditional methods. This will help other technical problems to be solved with the support of the finite element method.

Słowa kluczowe

EN

finite element method; ship hull vibrations; modal analysis; Patran-Nastran software

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2019
• Tom: Vol. 26, No. 1
• Strony: 31--38
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Doan Do Van

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83-87, 81-225 Gdynia, Poland tel.: [phone]

autor

Murawski Lech

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83-87, 81-225 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Do, D., Szeleziński, A., Murawski, L., Muc, A., Finite element metod in modelling of ship structures part I – theoretical background, Zeszyty Naukowe Akademii Morskiej w Gdyni Vol. 100, pp. 51-62, 2017.
• [2] Do, D., Szeleziński, A., Murawski, L., Muc, A., Finite element metod in modelling of ship structures part II – practical analysis example, Zeszyt Naukowe Akademii Morskiej w Gdyni Vol. 105, pp. 19-31, 2018.
• [3] Det, N. V., Prevention of Harmful Vibration in Ships, Printed in Norway by Det Norske Veritas, Oslo, Norway 1983.
• [4] Hughes, O. F., Ship structural design, Jersey city New Jersey Society of Naval Architects and Marine Engineers, 1988.
• [5] MSC.Software, MSC Nastran, Industry Leading Multidisciplinary FEA Solution. http://www.mscsoftware.com/product/msc-nastran, December 2012.
• [6] MSC.Software. MSC Nastran 2017, Dynamic Analysis User’s Guide. MSC.Software Corporation, Santa Ana, CA 92707 USA, revision 0, November 25, 2016.
• [7] MSC.Software. MSC Nastran 2018, Quick Reference Guide. MSC.Software Corporation, Santa Ana, CA 92707 USA, December 7, 2017.
• [8] Todd, F. H., Ship hull vibration. London, Edward Arnold Ltd, 1961.
• [9] Okada, Y., Shipbuilding design handbook, The Kansai Society of Naval Architects, Tokyo 1983.
• [10] Yumei, Y., Hongyu, C., Deyou, Z., Ming, H., Predicting method of natural frequency for ship's overall vertical vibration, Shipbuilding, Vol. 65, No. 3, 2014.
• [11] Zhao, D. Y., Calculation method of natural frequency for ship’s overall vibration, China Biaozhun Publishing House, Beijing 1993.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).