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contributor authorGoulos, Ioannis
contributor authorPachidis, Vassilios
date accessioned2017-05-09T01:17:27Z
date available2017-05-09T01:17:27Z
date issued2015
identifier issn1528-8919
identifier othergtp_137_01_012503.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/157846
description abstractThis paper elaborates on the theoretical development of a mathematical approach, targeting the realtime simulation of aeroelasticity for open rotors with slender blades, as employed in the majority of rotorcraft. A Lagrangian approach is formulated for the rapid estimation of natural vibration characteristics of rotor blades with nonuniform structural properties. Modal characteristics obtained from classical vibration analysis methods are utilized as assumed deformation functions. Closed form integral expressions are incorporated, describing the generalized centrifugal forces and moments acting on the blade. The treatment of threedimensional elastic blade kinematics in the timedomain is thoroughly discussed. In order to ensure robustness and establish applicability in real time, a novel, secondorder accurate, finitedifference scheme is utilized for the temporal discretization of elastic blade motion. The developed mathematical approach is coupled with a finitestate induced flow model, an unsteady blade element aerodynamics model, and a dynamic wake distortion model. The combined formulation is implemented in an existing helicopter flight mechanics code. The aeroelastic behavior of a fullscale hingeless helicopter rotor has been investigated. Results are presented in terms of rotor blade resonant frequencies, rotor trim performance, oscillatory structural blade loads, and transient rotor response to control inputs. Extensive comparisons are carried out with wind tunnel (WT) and flight test (FT) measurements found in the open literature as well as with nonrealtime comprehensive analysis methods. It is shown that the proposed approach exhibits good agreement with measured data regarding trim performance and transient rotor response characteristics. Accurate estimation of structural blade loads is demonstrated, in terms of both amplitude and phase, up to the third harmonic component of oscillatory loading. It is shown that the developed model can be utilized for realtime simulation on a modern personal computer. The proposed methodology essentially constitutes an enabling technology for the multidisciplinary design of rotorcraft, when a compromise between simulation fidelity and computational efficiency has to be sought for in the process of model development.
publisherThe American Society of Mechanical Engineers (ASME)
titleReal Time Aero elasticity Simulation of Open Rotors With Slender Blades for the Multidisciplinary Design of Rotorcraft
typeJournal Paper
journal volume137
journal issue1
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4028180
journal fristpage12503
journal lastpage12503
identifier eissn0742-4795
treeJournal of Engineering for Gas Turbines and Power:;2015:;volume( 137 ):;issue: 001
contenttypeFulltext


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