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하종용(Ha, Jong-Yong),김용한(Kim, Yong-Han),양보석(Yang, Bo-Suk),삼하신(Morishita, Shin),안경관(Ahn, Kyoung-Kwan),안영공(Ahn, Young-Kong) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.11
The paper presents the identification of dynamic property of a rotor system with a squeeze film damper (SFD) using magnetic fluid. An electromagnet Is installed in the inner damper of the SFD. The magnetic fluid is well known as a functional fluid. Its rheological property can be changed by controlling the applied current to the fluid and the fluid can be used as lubricant. Basically, the proposed SFD has the characteristics of a conventional SFD without an applied current, while the damping and stiffness Properties change according to the variation of the applied electric current. Therefore, when the applied current is changed, the whirling vibration of the rotor system can be effectively reduced. The clustering-based hybrid evolutionary algorithm (CHEA) is used to identify linear stiffness and damping coefficients of the SFD based on measured unbalance responses.
하종용(Jong-Yong Ha),김선화(Sun-Hwa Kim),송애희(Ae-Hee Song),양보석(Bo-Suk Yang) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper is a case study of a wire drawing machine which emits high noise (over 90 dB) no later than 2 years since it was newly installed and produces wavy wire. Wire passes through 11 blocks of die bore totally, and the diameter in the first bore is 4.79 ㎜ and the last is 1.48 ㎜. The final wire diameter is 1.2 ㎜. In the company to solve the curving shape phenomenon of the final wire product, a heavy wooden stick was put on the vibrating wire at each block. Here wire vibration frequency can be estimated by dividing the line speed by wavy wire pitch. This frequency is considered to be calculated by using formula for string's natural frequency.