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Development of Rotordynamics Program Based on the 2D Finite Element Method for Flywheel Energy Storage System

2차원 유한요소법을 적용한 플라이휠 에너지 저장 장치 동특성 해석 프로그램 개발

  • Gu, Dong-Sik (Dept. of Precision and Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Bae, Yong-Cae (Plant Integrity Group, Korea Electric Power Research Institute) ;
  • Lee, Wook-Ryun (Plant Integrity Group, Korea Electric Power Research Institute) ;
  • Kim, Jae-Gu (Dept. of Precision and Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Kim, Hyo-Jung (Dept. of Precision and Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Choi, Byeong-Keun (Dept. of Energy and Mechanical Engineering, Institute of Marine Industry, Gyeongsang Nat'l Univ.)
  • Received : 2010.06.01
  • Accepted : 2010.09.13
  • Published : 2010.11.01

Abstract

Flywheel energy storage system (FESS) is defined as a high speed rotating flywheel system that can save surplus electric power. The FESS is proposed as an efficient energy storage system because it can accumulate a large amount of energy when it is operated at a high rotating speed and no mechanical problems are encountered. The FESS consists of a shaft, flywheel, motor/generator, bearings, and case. It is difficult to simulate rotor dynamics using common structure simulation programs because these programs are based on the 3D model and complex input rotating conditions. Therefore, in this paper, a program for the FESS based on the 2D FEM was developed. The 2D FEM can model easier than 3D, and it can present the multi-layer rotor with different material each other. Stiffness changing of the shaft caused by shrink fitting of the hub can be inputted to get clear solving results. The results obtained using the program were compared with those obtained using the common programs to determine any errors.

Keywords

Flywheel Energy Storage System;Rotor Dynamics;Finite Element Method;Natural Frequency

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP), 한국산업기술진흥원

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