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DYMAMESI 2014 - proceedings
Zolotarev, Igor ; Pešek, Luděk
Proceedings of the Colloquium DYNAMICS OF MACHINES AND MECHANICAL SYSTEMS WITH INTERACTIONS (DYMAMESI), that was held in the Institute of Thermomechanics in Prague, November 25 - 26, 2014 deal with problems structural and multibody dynamics, in coupled interacting systems as aero-elasticity, hydro-elasticity, biomechanics, systems with feedbacks and mechatronics. The published papers was divided into the two parts: Interactions - vibration of dynamic systems coupled with surroundings, mechanical systems with feedbacks, mechatronic active elements, measurement methods and identification in interaction problems, interactions in biomechanics, aero- and hydro-elasticity in rotational engines (bearings, blades, sealings, spaces), analytical and numerical methods in solutions of interactions and Dynamics of Machines - dynamics and vibrations of mechanical systems and solids, non-linear systems - stability, bifurcations, chaos, damping technologies - materials, active elements, methods, identification, vibrodiagnostics, fatigue, computational mechanics and experiments.
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Static, spectral and modal analysis of the support of NACA0015 profile
Chládek, Štěpán ; Kozánek, Jan ; Vlček, Václav ; Zolotarev, Igor
In this paper the static and dynamic properties of the new proposed aerodynamical NACA0015 profile were experimentally investigated. The static stiffness of the angular and longitudinal profile support were determined by optical method. By pulse excitation were measured dynamical characteristics for different stiffness and mass configurations and identified corresponding spectral and modal properties. It will be useful for appropriate tuning of this dynamical system to achieve the flutter vibration in aerodynamical tunnel.
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Identification of the aeroelastic profile based on optical measurement
Chládek, Štěpán ; Zolotarev, Igor
Abstract: This paper introduces an identification of an aeroelastic profile as n – degrees of freedom linear system. The common identification is based on the excitation of the system with an impact hammer and the measurement of the response by an acceleration sensor and using the transfer functions the modal properties are evaluated. This approach gives a disadvantage in the sense of influence of the system structural properties. In this paper the identification of the dynamical system is based on the optical measurement of the system response. The great advantages of this approach are both the low influence of the measuring devices to the system properties and the high precision of the measurement. The theory has been verified on the aeroelastic profile NACA 0012 with 2 degrees of freedom and the results are presented.
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Flutter at a low velocity
Vlček, Václav ; Kozánek, Jan ; Zolotarev, Igor
Aeroelastic experiments with the profile NACA0015 were realized in the suction type aerodynamic tunnel of the Institute of Thermomechanics, Czech Academy of Sciences, Prague. The profile had two degrees of freedom realized in translation and rotation motion and flow velocity was just up its critical value. The flow field was measured with interferometry method and the results obtained at the velocity M = 0.23 in the flutter regime are presented. The evaluation of interferogramms enabled to determine the components of the drag and lift forces.
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Optická měření proudového pole při obtékání samobuzeně kmitajícího profilu
Vlček, Václav ; Kozánek, Jan ; Zolotarev, Igor
V příspěvku jde o interferometrické vyhodnocení aerodynamického měření proudu vzduchu v okolí profilu NACA0015 v režimu samobuzeného kmitání, realizované v aerodynamickém tunelu Ústavu termomechaniky. Zkušební profil vykonával pohyb odpovídající dynamické soustavě o dvou stupních volnosti ve vertikalním směru a rotoval kolem osy umístěné v 1/3 profilu. Odpovídající Machovo číslo bylo 0.45. Je prezentována kinematika profilu, působící síly a momenty během samobuzeného kmitání.
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Engineering Mechanics 2013
Zolotarev, Igor
The objective of the 19th conference is to provide a forum for researchers to discuss the state-of-the-art in Mechanics of Solids, Fluids and Thermomechanics, this particularly in connection with problems under investigation in the Czech Republic. Problems of Engineering Mechanics related to the contemplated topics can be discussed, and their solutions presented, during the sessions of the Conference, held at the Hotel of the ŽĎAS, a.s., situated in the beautiful countryside of the Žďár Highlands.
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