000012425 001__ 12425
000012425 005__ 20160816141444.0
000012425 04107 $$aeng
000012425 046__ $$k2016-05-09
000012425 100__ $$aChládek, Š.
000012425 24500 $$aCOMPUTATION OF AERODYNAMIC DAMPING IN AEROELASTIC SYSTEMS BASED ON ANALYTICAL AND NUMERICAL APPROACH

000012425 24630 $$n22.$$pEngineering Mechanics 2016
000012425 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Praha
000012425 506__ $$arestricted
000012425 520__ $$2eng$$aThe paper describes computation of aerodynamic damping and natural frequencies of aeroelastic systems. The damping is a critical parameter for the stability analysis of aeroelastic systems. Structural damping of the system is important for very low fluid flow velocities, however by increasing the flow velocity, the aerodynamic damping dominates in the instability search. The damping can be evaluated in time or in frequency domain. The presented computation of aerodynamic damping consists of two analytical and one numerical approach. The analytical approaches are represented by the well-known pk method and the unsteady panel method. The pk method is based on Theodorsen unsteady aerodynamics and on the computation of complex eigenvalues of the system as functions of the flow velocity. The unsteady panel method enables the computation of the interaction between aeroelastic system and fluid flow. The aerodynamic damping is evaluated in time domain from the system response to given initial conditions. The numerical approach is based on the finite volume method (FVM) modelling the complete fluid-structure interaction (FSI) coupled problem. The aerodynamic damping is also computed from the system response to a given initial condition. The results of the mentioned methods are compared for the profile NACA 0012 with two degrees of freedom (2-DOF) for plunge and pitch motion around an elastic axis.

000012425 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012425 653__ $$aaeroelastic instability, aerodynamic damping and eigenfrequency analysis, fluid structure interaction

000012425 7112_ $$aEngineering Mechanics 2016$$cSvratka, CZ$$d2016-05-09 / 2016-05-12$$gEM2016
000012425 720__ $$aChládek, Š.$$iHoráček, J.$$iZolotarev, I.
000012425 8560_ $$ffischerc@itam.cas.cz
000012425 8564_ $$s414231$$uhttps://invenio.itam.cas.cz/record/12425/files/055bo_o_flu.pdf$$yOriginal version of the author's contribution as presented on CD, id 055, section FLU.
000012425 962__ $$r12369
000012425 980__ $$aPAPER