Improvement of sail storage and deployment mechanism for spin-type solar power sail
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https://doi.org/10.1007/s42064-019-0063-z
Improvement of sail storage and deployment mechanism for spin-type solar power sail Osamu Mori1 (), Nobukatsu Okuizumi1 , Toshihiro Chujo2 , and Yuki Takao3 1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan 2. Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo152-8550, Japan 3. Department of Aeronautics and Astronautics, the University of Tokyo, Tokyo 113-8654, Japan
ABSTRACT
first solar propulsion sail-craft in history. JAXA has long been studying the technology of
KEYWORDS solar sail solar power sail storage deployment IKAROS OKEANOS
spin deployment of sail membranes, and is currently planning the spin deployment of a class
Research Article
Deployable membrane structures are expected to be used for large-area space structures, such as solar propulsion sails, magnetoplasma sails, drag-deorbiting sails, membrane antennas, and solar power sails. They are lightweight and can be compactly stored at launch. One achievement of the Japan Aerospace Exploration Agency (JAXA) was the successful deployment of a 200 m2 sail using centrifugal force in the IKAROS mission, which was the
2
sail larger than 2000 m as the next step in the development of the IKAROS technology.
Received: 2 May 2019
This paper discusses the unexpected behaviors during on-orbit sail deployment by IKAROS,
Accepted: 15 June 2019
as well as problems with the sail holding method, and proposes an improved sail storage
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structure and deployment mechanism for the OKEANOS mission.
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Introduction
Deployable space sail structures can be ultralight and very large, and they have diverse applications [1]. Solar propulsion sails are driven by solar radiation pressure. Magnetoplasma sails produce a large-scale magnetic field to block the hypersonic solar wind plasmaflow. Drag-deorbiting sails are used to increase aerodynamic drag to hasten Earth re-entry at the end of a mission. Membrane antennas become large aperture lightweight antennas. Solar power sails generate electricity using thin-film solar cells attached to the sail. The solar power sail can be an ultralight power generation system, which can generate sufficient electric power to drive the high-Isp ion engines in the outer planetary region by attaching thin-film solar cells over the entire surface of the large sail membrane. The solar power sail-craft can be a high-performance propulsion system. There are two types of sails. One is the boom-type that uses some rigid support structure to deploy and maintain the sail [2, 3]. The sail can be deployed statically and certainly. A lot of boom-type sail missions
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2019
have been studied [4–6]. Because the larger the sail is, the heavier the boom and deployment mechanism become, this type is suitable for the sail of small or medium size. The other is the spin-type that uses spinning centrifugal force. The spin-type can be accomplished with mechanisms of lighter weight, because i
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