Twist morphing of a hingeless rotor blade using a moving mass

M. R. Amoozgar, A. D. Shaw, J. Zhang, M. I. Friswell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper presents a new concept of morphing by changing the twist of a composite blade through the movement of a mass near the tip of the blade. The mass is moved in the chordwise direction which then modifies the centrifugal force near the tip of the blade. The blade is tailored with composite materials and hence coupling is introduced. By moving the mass in the chordwise direction, a variable bending moment is produced which is the result of the offset between the point mass centrifugal force and the shear centre of the blade section. This bending moment will be transferred to the composite spar, and then through the bend-twist coupling of the composite layup, a variable torsional moment will be induced. This variable torsional moment changes the twist distribution of the blade. The dynamics of the rotating composite blade is modelled by using the geometrically exact fully intrinsic beam equations and the point mass is considered as a non-structural concentrated mass which has offsets with respect to the beam reference line. It is found that by moving the mass in the chordwise direction, the twist distribution of the blade changes. The rate of twist change completely depends on the bend-twist coupling and also the point mass magnitude and location. Finally, the effect of sensitive morphing parameters on the rotating frequencies of the Bo105 main rotor blade is determined.

Original languageEnglish
Title of host publication44th European Rotorcraft Forum 2018, ERF 2018
PublisherNetherlands Association of Aeronautical Engineers
Pages1206-1215
Number of pages10
Volume2
ISBN (Electronic)9781510879645
Publication statusPublished - Sep 2018
Externally publishedYes
Event44th European Rotorcraft Forum 2018 - Delft, Netherlands
Duration: 18 Sep 201821 Sep 2018
Conference number: 44
https://www.erf2018.org/erf2018-general-information-and-preliminary-programme.pdf

Conference

Conference44th European Rotorcraft Forum 2018
Abbreviated titleERF 2018
CountryNetherlands
CityDelft
Period18/09/1821/09/18
Internet address

Fingerprint

rotor blades
rigid rotors
blades
Turbomachine blades
Rotors
Composite materials
Bending moments
composite materials
bending moments
centrifugal force
moments
shear

Cite this

Amoozgar, M. R., Shaw, A. D., Zhang, J., & Friswell, M. I. (2018). Twist morphing of a hingeless rotor blade using a moving mass. In 44th European Rotorcraft Forum 2018, ERF 2018 (Vol. 2, pp. 1206-1215). Netherlands Association of Aeronautical Engineers.
Amoozgar, M. R. ; Shaw, A. D. ; Zhang, J. ; Friswell, M. I. / Twist morphing of a hingeless rotor blade using a moving mass. 44th European Rotorcraft Forum 2018, ERF 2018. Vol. 2 Netherlands Association of Aeronautical Engineers, 2018. pp. 1206-1215
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Amoozgar, MR, Shaw, AD, Zhang, J & Friswell, MI 2018, Twist morphing of a hingeless rotor blade using a moving mass. in 44th European Rotorcraft Forum 2018, ERF 2018. vol. 2, Netherlands Association of Aeronautical Engineers, pp. 1206-1215, 44th European Rotorcraft Forum 2018, Delft, Netherlands, 18/09/18.

Twist morphing of a hingeless rotor blade using a moving mass. / Amoozgar, M. R.; Shaw, A. D.; Zhang, J.; Friswell, M. I.

44th European Rotorcraft Forum 2018, ERF 2018. Vol. 2 Netherlands Association of Aeronautical Engineers, 2018. p. 1206-1215.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - This paper presents a new concept of morphing by changing the twist of a composite blade through the movement of a mass near the tip of the blade. The mass is moved in the chordwise direction which then modifies the centrifugal force near the tip of the blade. The blade is tailored with composite materials and hence coupling is introduced. By moving the mass in the chordwise direction, a variable bending moment is produced which is the result of the offset between the point mass centrifugal force and the shear centre of the blade section. This bending moment will be transferred to the composite spar, and then through the bend-twist coupling of the composite layup, a variable torsional moment will be induced. This variable torsional moment changes the twist distribution of the blade. The dynamics of the rotating composite blade is modelled by using the geometrically exact fully intrinsic beam equations and the point mass is considered as a non-structural concentrated mass which has offsets with respect to the beam reference line. It is found that by moving the mass in the chordwise direction, the twist distribution of the blade changes. The rate of twist change completely depends on the bend-twist coupling and also the point mass magnitude and location. Finally, the effect of sensitive morphing parameters on the rotating frequencies of the Bo105 main rotor blade is determined.

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Amoozgar MR, Shaw AD, Zhang J, Friswell MI. Twist morphing of a hingeless rotor blade using a moving mass. In 44th European Rotorcraft Forum 2018, ERF 2018. Vol. 2. Netherlands Association of Aeronautical Engineers. 2018. p. 1206-1215