Mutual interactions between shock waves and structures.
Item
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Title
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Mutual interactions between shock waves and structures.
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Identifier
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AAI3213250
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identifier
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3213250
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Creator
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Gong, Minwei.
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Contributor
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Adviser: Yiannis Andreopoulos
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Date
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2006
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Mechanical
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Abstract
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In this thesis, the mutual interaction of shock waves and structures was studied. Experiments were carried out in a shock tube to investigate the aero-elastic response of fully clamped thin circular plates during face-on impact with planar shock waves. High frequency response dynamic strain history was obtained on various locations of the plate and measurement of acoustic pressure excited by the vibrating plate was performed as well. Analytical formulas based on Poisson-Kirchoff theory were employed to determine the modal frequency. These modal frequency was also calculated by performing Finite Element Analysis consists of a coupled system of equations between the fluid and solid phases. Further more, a coupled aero-elastic solver based on quad-edge data structure was implemented to solve the fluid structure interaction problem. The moving boundary was treated with an advancing front remeshing which was fully conservative. Adaptive mesh refinement was also implemented for improved efficiency and accuracy. Numerical strain history of the plate was obtained as well as the full flow filed. It was also shown that shock wave reflection starts at the same time at all locations of contact, and the reflected pressure may exceed the pressure reflected off a rigid wall in comparable configuration. Further non-linear analysis was performed on the numerical results. The time and location of the shock wave formation as a result of non-linear propagation of the pressure wave was estimated analytically. Non-linearity intensifies when the plate is vibrating at high frequency while the wave propagation speed is low which is characterized by the characteristic time scale of the plate vibration and pressure wave propagation.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
