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Free vibration analysis of rocket nozzles using energy methods
1998 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The vibration characteristics of stiffened thin shells are studied numerically within the context of the Donnell-Mushtari theory. Different stiffener spacing and dimensions are considered in the formulations. The natural frequencies of a clamped-free ring-stiffened truncated conical shell are calculated by the use of the Rayleigh-Ritz method and compared with ANSYS. The conical shell model is extended to approximate shells of revolution with small curvature and a study of the Vulcain 2NE skirt with different stiffener arrangements, using the developed method, has been performed. This is done to gain understanding of how different frequency regions are effected by variation of stiffener dimensions and numbers. From the study, it can be concluded that the membrane frequencies are fairly insensitive of different stiffener arrangements and more than fifteen stiffeners have little influence on the bending frequencies. The stiffener height has the largest impact on the frequencies when the shell is stiffened by many stiffeners.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Rayleigh-Ritz, reinforced, stiffened, conical, shells, eigenfrequencies, ANSYS, Mathematica
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42068ISRN: LTU-EX--98/331--SELocal ID: 020d51ec-d9a8-42e0-93b7-7e08c086c952OAI: diva2:1015284
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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