The errors of the numerical calculations of dynamic characteristics of cantilever beam mounted on the plate

• Autorzy: Van Doan D. , Murawski L.

Identyfikatory

DOI

10.5604/01.3001.0012.2514

• Języki publikacji: EN

Abstrakty

EN

The safety, comfort of the crews, stability, economics of the equipment when ship operating is the leading requirement in the field of designing and manufacturing marine structure and machinery. As a result, all parts of the ships must be tested and inspected to meet the basic safety requirements of the shipping association. The design, manufacture, testing in the maritime field in general and shipbuilding sector in particular are expensive, time consuming: such as aerodynamic experiments of the engine, collision test, ship manoeuvring, vibration test and balance of deck beams, hull beams, hatch covers, shafts ...thus experimental works are sometimes impossible. Along with the development of computer science, many numerical models and software programs have been developed to solve these difficult problems. There are many numerical modelling methods, starting with the finite difference method, the boundary element method, the finite element method, the no mesh method, the weight residue or the energy method. The Work will be limited to the analysis of the most popular numerical modelling method - finite element method using Patran and Nastran software. In the first step of our research, T-beam was analysed as a part of ship hull structure (thin-walled structure). The article goes into the analysis of the accuracy of selected numerical models for the natural vibration frequency of the T-beams mounted on the plate. After modelling, calculating the natural frequency of the T-beam using the Patran - Nastran software, the results were compared with the theoretical values. From that, we evaluate the dispersion and error of different numerical models and select the optimal numerical model. Optimal model will be used for modelling full ship hull with superstructure.

Słowa kluczowe

EN

T-Beam; vibration; ship structure; modal analysis; FEM errors

PL

T-Beam; wibracja; struktura statku; analiza modalna; błędy MES

• 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: 2018
• Tom: Vol. 25, No. 1
• Strony: 433--440
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Van Doan D.

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

autor

Murawski L.

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

Bibliografia

• [1] Hamdan, M. N., Jubran, B. A., Free and forced vibrations of a restrained cantilever beam carrying a concentrated mass, J KAU: Eng. Sci., Vol. 3, pp. 71-83, 1991.
• [2] Kojima, H., Nagaya, K., Niiyama, N., Nagai, K., Vibration control of a beam structure using an electromagnetic damper with velocity feedback, Bulletin of JSME, Vol. 25 (254), pp. 2653-2659, 1986.
• [3] Lau, J. R., Vibration Frequencies and mode shapes for a constrained cantilever, Journal of Applied Mechanics, Vol. 51, pp. 182-197, 1984.
• [4] Liu, W. H., Haung, C. C., Free vibration of restrained beam carrying concentrated masses, Journal of Sound and Vibration, Vol. 123, pp. 31-42, 1998.
• [5] Nagaya, K., Ishikawa, M., A noncontact permanent magnet levitation table with electro-magnetic control and its vibration isolation method using direct disturbance cancellation combining optimal regulators, IEEE Transactions on Magnetics, Vol. 31, No. 1, 1995.
• [6] Okumoto, Y., Takeda, Y, Mano, M., Okada, T., Design of Ship Hull Structures, Springer- -Verlag, Berlin, Heidelberg 2009.
• [7] Rao, S. S., Mechanical Vibrations, Addison-Wesley Publishing Company, 2000.
• [8] Rossit, C. A., Laura, P. A. A., Free vibrations of a cantilever beam with a spring–mass system attached to the free end, Ocean Engineering, Vol. 28, pp. 933-939, 2001.
• [9] Ryde, G. H., Strength of Materials, third edition in SI units 1969, Published by Macmillan and Co LTD, 1969.
• [10] Schafer, B. E., Holzach, H., Experimental researches on flexible beam modal control, Journal of Guidance, Control, and Dynamics, Vol. 8, No. 5, pp. 597-604, 1985.
• [11] Todd, F. H., Ship Hull Vibration, Edward Arnold Ltd, Publishers 1961.

Uwagi

PL

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