Rotational Motions Excited by Vertical Harmonic Motions

Tadokoro Chiharu, Kadowaki Kei, Hiroki Mori, Nagamine Takuo

Research output: Contribution to journalArticle

Abstract

Rotation of a pair of wings was driven by the vertical harmonic motion of a pin inserted into the center hole of the wings. To elucidate the mechanism by which the rotational motion of the wings was excited, the relationship between the wings and the pin was examined by tracking their motions using both displacement measurements and high-speed photography. The motion modes occurred in this study were categorized into five types: slipping, rolling, jumping (without eccentricity), jumping (with eccentricity), and non-rotation. In the case that the hole of the wings was located at a distance from the center of the wings, referred to as ″with eccentricity, ″ the slipping, jumping (with eccentricity), and non-rotation modes resulted. The experimental results showed that the mechanism of the jumping (with eccentricity) was different from that of the other modes (slipping, rolling, jumping (without eccentricity)), which are well known to be driven by the periodical reaction of the wings against the vertical vibration of the pin. It was found that the jumping (with eccentricity) was driven by the non-periodical force with the collision between the wing hole and the pin.

Original languageEnglish
Pages (from-to)51-57
Number of pages7
JournalTransactions of Nanjing University of Aeronautics and Astronautics
Volume35
Issue number1
Publication statusPublished - Feb 1 2018

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harmonic motion
wings
eccentricity
High speed photography
high speed photography
Displacement measurement
displacement measurement
photography
vibration
collision
collisions

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Rotational Motions Excited by Vertical Harmonic Motions. / Chiharu, Tadokoro; Kei, Kadowaki; Mori, Hiroki; Takuo, Nagamine.

In: Transactions of Nanjing University of Aeronautics and Astronautics, Vol. 35, No. 1, 01.02.2018, p. 51-57.

Research output: Contribution to journalArticle

Chiharu, Tadokoro ; Kei, Kadowaki ; Mori, Hiroki ; Takuo, Nagamine. / Rotational Motions Excited by Vertical Harmonic Motions. In: Transactions of Nanjing University of Aeronautics and Astronautics. 2018 ; Vol. 35, No. 1. pp. 51-57.
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