Lagwise loads analysis of a rotor blade with an embedded chordwise absorber

Dong Han, Edward Smith

Research output: Contribution to journalConference article

Abstract

An aeroelastic simulation of a stiff in-plane hingeless rotor in forward night is conducted to evaluate the feasibility of reducing lagwise root loads via an embedded absorber within the blade. A finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag and torsion deflections of the rotor blade. The mass-spring-damper absorber system is simulated as a one-degree-of-freedom rigid body with chordwise motion. By using Hamilton principle, system equations of motion are derived based on the generalized force formulation. Dynamic responses are calculated to investigate the potential of absorber for in-plane loads reduction. Parametric studies are conducted to explore the influence of the absorber on the dynamic characteristics of the rotor blade. From the aeroelastic analysis of the blade-absorber system, results indicate that putting an embedded absorber in the blade chordwise direction can decrease the first and second order lagwise root bending moments by about 50% and 90% respectively under large load states. The effects of absorber frequency, absorber damping, chordwise position of the absorber, rotor thrust, forward speed and trim condition are also studied.

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Turbomachine blades
Rotors
Bending moments
Torsional stress
Equations of motion
Dynamic response
Damping
Finite element method

All Science Journal Classification (ASJC) codes

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{d6334120c26d4dbab50978372894329a,
title = "Lagwise loads analysis of a rotor blade with an embedded chordwise absorber",
abstract = "An aeroelastic simulation of a stiff in-plane hingeless rotor in forward night is conducted to evaluate the feasibility of reducing lagwise root loads via an embedded absorber within the blade. A finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag and torsion deflections of the rotor blade. The mass-spring-damper absorber system is simulated as a one-degree-of-freedom rigid body with chordwise motion. By using Hamilton principle, system equations of motion are derived based on the generalized force formulation. Dynamic responses are calculated to investigate the potential of absorber for in-plane loads reduction. Parametric studies are conducted to explore the influence of the absorber on the dynamic characteristics of the rotor blade. From the aeroelastic analysis of the blade-absorber system, results indicate that putting an embedded absorber in the blade chordwise direction can decrease the first and second order lagwise root bending moments by about 50{\%} and 90{\%} respectively under large load states. The effects of absorber frequency, absorber damping, chordwise position of the absorber, rotor thrust, forward speed and trim condition are also studied.",
author = "Dong Han and Edward Smith",
year = "2008",
month = "7",
day = "4",
language = "English (US)",
journal = "Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference",
issn = "0273-4508",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",

}

TY - JOUR

T1 - Lagwise loads analysis of a rotor blade with an embedded chordwise absorber

AU - Han, Dong

AU - Smith, Edward

PY - 2008/7/4

Y1 - 2008/7/4

N2 - An aeroelastic simulation of a stiff in-plane hingeless rotor in forward night is conducted to evaluate the feasibility of reducing lagwise root loads via an embedded absorber within the blade. A finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag and torsion deflections of the rotor blade. The mass-spring-damper absorber system is simulated as a one-degree-of-freedom rigid body with chordwise motion. By using Hamilton principle, system equations of motion are derived based on the generalized force formulation. Dynamic responses are calculated to investigate the potential of absorber for in-plane loads reduction. Parametric studies are conducted to explore the influence of the absorber on the dynamic characteristics of the rotor blade. From the aeroelastic analysis of the blade-absorber system, results indicate that putting an embedded absorber in the blade chordwise direction can decrease the first and second order lagwise root bending moments by about 50% and 90% respectively under large load states. The effects of absorber frequency, absorber damping, chordwise position of the absorber, rotor thrust, forward speed and trim condition are also studied.

AB - An aeroelastic simulation of a stiff in-plane hingeless rotor in forward night is conducted to evaluate the feasibility of reducing lagwise root loads via an embedded absorber within the blade. A finite element analysis based on a moderate deflection beam model is employed to capture the flap, lag and torsion deflections of the rotor blade. The mass-spring-damper absorber system is simulated as a one-degree-of-freedom rigid body with chordwise motion. By using Hamilton principle, system equations of motion are derived based on the generalized force formulation. Dynamic responses are calculated to investigate the potential of absorber for in-plane loads reduction. Parametric studies are conducted to explore the influence of the absorber on the dynamic characteristics of the rotor blade. From the aeroelastic analysis of the blade-absorber system, results indicate that putting an embedded absorber in the blade chordwise direction can decrease the first and second order lagwise root bending moments by about 50% and 90% respectively under large load states. The effects of absorber frequency, absorber damping, chordwise position of the absorber, rotor thrust, forward speed and trim condition are also studied.

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M3 - Conference article

JO - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

JF - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

SN - 0273-4508

ER -