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Journal of Composite Materials
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Design of a Hybrid Composite Flywheel Multi-rim Rotor System using Geometric Scaling Factors

Sung K. Ha

Department of Mechanical Engineering, Hanyang University Sa1-dong Ansan, Gyunggi-do, 426-791 Korea, sungha{at}hanyang.ac.kr

Jae H. Kim

Department of Mechanical Engineering, Hanyang University Sa1-dong Ansan, Gyunggi-do, 426-791 Korea

Young H. Han

Korea Electric Power Research Institute 103-16 Munji-dong Yusong-gu Daejon, 305-380 Korea

The effects of geometric scaling on the static and dynamic behavior of a multi-rim hybrid press-fitted composite flywheel rotor are investigated and applied to its design procedure. It is verified that the stresses among the scaled multi-rim hybrid rotors remain the same as long as press-fit interferences are linearly scaled, curing temperature remains unchanged, and the rotational speed is inversely proportional. With the linearly scaled supporting stiffness of the scaled rotor and shaft, a relationship between inversely scaled critical speeds and rotational speeds remains unchanged. Double rim rotors of 5 kWh and 100 kWh energy storage are designed by scaling an optimized 0.5 kWh multi-rim rotor. Then, the rotors of 5 kWh were manufactured by wet-winding E-glass and T-700 fibers with a low-temperature cured epoxy system.

Key Words: multi-rim flywheel rotor • press-fit • scaling effect • residual stresses.

This version was published on April 1, 2008

Journal of Composite Materials, Vol. 42, No. 8, 771-785 (2008)
DOI: 10.1177/0021998308088590
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