TY - GEN
T1 - Influence of atmospheric turbulence on helicopter elastic rotor hub vibrations
AU - Rex, Willem
AU - Hajek, Manfred
N1 - Publisher Copyright:
Copyright © 2020 by the Vertical Flight Society. All rights reserved.
PY - 2020
Y1 - 2020
N2 - Rotorcraft are exposed to atmospheric disturbances which can induce considerable vibrations in flight. Previous projects concentrated on studying the impact of atmospheric turbulence on flight dynamics using rigid blades and a rigid fuselage. In this work an elastic rotor-fuselage coupled representation is used to understand how vibrations introduced by atmospheric turbulence are transmitted from the rotor blades into the fuselage by elastic motion. The rigid fuselage motion is neglected in this work. Two semi-empiric stochastic turbulence simulation approaches are used, a full field turbulence model (FFTM) and a hub based turbulence model (HBTM). The simulated turbulence characteristics match with analytical solutions. The power spectral densities clearly show rotational sampling effects at low speed which propagate into the elastic fuselage as well. Atmospheric turbulence introduces significant broadband vibrations at the main rotor hub which carry a considerable amount of energy into the non-rotating helicopter structure. Frequencies related to rotor rotational speed are negligibly affected by atmospheric turbulence.
AB - Rotorcraft are exposed to atmospheric disturbances which can induce considerable vibrations in flight. Previous projects concentrated on studying the impact of atmospheric turbulence on flight dynamics using rigid blades and a rigid fuselage. In this work an elastic rotor-fuselage coupled representation is used to understand how vibrations introduced by atmospheric turbulence are transmitted from the rotor blades into the fuselage by elastic motion. The rigid fuselage motion is neglected in this work. Two semi-empiric stochastic turbulence simulation approaches are used, a full field turbulence model (FFTM) and a hub based turbulence model (HBTM). The simulated turbulence characteristics match with analytical solutions. The power spectral densities clearly show rotational sampling effects at low speed which propagate into the elastic fuselage as well. Atmospheric turbulence introduces significant broadband vibrations at the main rotor hub which carry a considerable amount of energy into the non-rotating helicopter structure. Frequencies related to rotor rotational speed are negligibly affected by atmospheric turbulence.
UR - http://www.scopus.com/inward/record.url?scp=85094898965&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85094898965
T3 - Aeromechanics for Advanced Vertical Flight Technical Meeting 2020, Held at Transformative Vertical Flight 2020
SP - 590
EP - 607
BT - Aeromechanics for Advanced Vertical Flight Technical Meeting 2020, Held at Transformative Vertical Flight 2020
PB - Vertical Flight Society
T2 - Aeromechanics for Advanced Vertical Flight Technical Meeting 2020, Held at Transformative Vertical Flight 2020
Y2 - 21 January 2020 through 23 January 2020
ER -