Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Structural frequencies"”.
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Dynamics of circular cylindrical shells in contact with fluid.
… does not depend on the liquid level, and the structural resonances are clustered near the instability zone. Second, by applying the FE method (ANSYS) and carrying out holographic tests, it is found that the structural frequencies for n=l are most strongly influenced by the water level. For …
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Design of a Scaled Flight Test Vehicle Including Linear Aeroelastic Effects
… work has shown the viability in matching scaled structural frequencies and mode shapes in order to achieve consistent linear scaling of simple models. This methodology is adopted for use on a high fidelity joined-wing aircraft model. Natural frequencies and mode shapes are matched by optimizing …
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Structural optimization for control of stiffened laminated composite plates using nonlinear mixed integer programming
The effect of structural optimization on control of stiffened laminated composite structures is considered. The structural optimization considered here, is the maximization of structural frequencies of the structure subject to maximum weight and frequency separation constraints and an upper bound …
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Testing of the suspended vehicle system scale model
… and an accelerometer to detect vibrational frequencies. The output of ten LVDTs was recorded on either a Sanborn strip chart recorder or a magnetic type recorder. The accelerometer supplied a signal to a real-time frequency analyzer. The testing program consisted of both static and dynamic …
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An evaluation of component mode synthesis for modal analysis of finite element models
… inertia, and this results in two different structural mass matrices. Two new developments of the free-interface formulation are presented: (1) a method for calculating upper and lower bounds to the exact natural frequencies is given, providing a measure of the absolute accuracy of the …
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Shock oscillation mechanisms of highly separated transitional shock-wave/boundary-layer interactions
… combined induce a shock oscillation with frequencies approximately matching the blade's natural structural frequencies. This resonance causes excitation and vibrations, which, if not mitigated, can lead to fatigue and potential structural failure. This dissertation explores the dynamics of …