Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.01 vteřin. 
Load State of an Aircraft with an Elastic Wing
Schoř, Pavel ; Daněk, Vladimír (oponent) ; Slavík, Svatomír (oponent) ; Píštěk, Antonín (vedoucí práce)
This thesis proposes a methodology, how to calculate the load state of an aircraft with an elastic wing by first-order panel panel method according to Katz and Plotkin, Low-Speed Aerodynamics, 2001 coupled to a struc- tural analysis method according to Píštěk et al., Pevnost a životnost letadel I, 1988 and Lebofsky,Numerically Generated Tangent Stiffness Matrices for Geometrically Non-Linear Structures, 2013. For a flow, which is similar to a potential flow, panel methods can provide an accurate information about all characteristics required for a calculation of aerodynamic load. Unlike the CFD based methods, this method can be used on an average personal computer.
New Approaches in Numerical Aeroelasticity Applied in Aerodynamic Optimization of Elastic Wing
Navrátil, Jan ; Slavík, Svatomír (oponent) ; Komárek,, Martin (oponent) ; Hlinka, Jiří (vedoucí práce)
The aeroelasticity is an essential discipline involved in the aircraft design, aiming to predict phenomena occurring due to interaction of aerodynamic, elastic and inertial forces. Those phenomena might often lead to catastrophic consequences, thus it must be proven that they do not occur between the speeds bounding the airplane flight envelope. Current aircraft design leads to increased flexibility of the airframe as a result of modern materials application or aerodynamically efficient slender wings. The airframe flexibility influences the aerodynamic performance and it might significantly impact the aeroelastic effects, which can be more easily excited by rigid body motions than in case of stiffer structures. The potential aeroelastic phenomena can occur in large range of speeds involving transonic regime, where the non-linear flow effects significantly influence the flutter speed. Common aeroelastic analysis tools are mostly based on the linear theories for aerodynamic predictions, thus they fails to predict mentioned non-linear effect. The objective of the thesis is, therefore, to design, implement and test an aeroelastic computational tool employing the aerodynamic prediction solver which is able to predict non-linear flow. In the thesis, the main focus is directed to the static aeroelastic simulations. The methods involved in numerical static aeroelastic simulation are presented in the thesis. The implementation of the computational aeroelastic tool was described and the convergence of the coupled solver was investigated. The tool functionality was validated in the test cases involving different types of the aerodynamic and structural models. The tool was applied also in the aerodynamic shape optimization of an elastic wing. The results and computational cost were compared to the rigid wing optimization. Last chapter presents the author's contribution to the research oriented on the assessment of time synchronization scheme for the CFD-CSM coupled problem. The test case used here is a transonic flow around the Benchmark Super-Critical Wing at flutter condition. Results were compared to the experimental data provided by NASA.

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1 Slávik, Slavomír
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