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Central Ventilation Fan Blade 손상원인의 고찰
구재량(Koo-Jae Raeyang),고우식(Ko-Woo Sig),김연환(Kim-Yeon Hwan),박광하(Park-Kwang Ha) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
During the operation, Central ventilation fan stopped when switch on condition. When central ventilation fan disassemble, ten blades of fan fractured. We have searched cause of failure. We bad modeling one of the fan blades and analysis with computer programs. Thus We have find that fracture of central ventilation fan blades is alternative stress and vibration at hub. In this paper, We have described cause of failure.
구재량(Jae-Raeyang Koo),송오섭(Oh-Seop Song) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.4
This paper discusses the dynamic modeling and vibration analysis of transmission lines with Stockbridge dampers. Stockbridge dampers are attached to transmission lines to reduce the vibration amplitude of the transmission line, thus avoiding the risk of fatigue on the line. To build a dynamic model, the kinetic and potential energies of a transmission line with Stockbridge dampers were derived using the assumed mode method and Lagrange’s equation. The equations of motion are expressed in matrix form, which is suitable for numerical simulations. The efficiency of Stockbridge dampers on the vibration reduction of the transmission line was numerically investigated by changing their positions and properties. The numerical results show that attachment positions suggested by the installation manual do not provide good performance; therefore, it requires more investigation. It is also shown that a high natural frequency and damping ratio lead to better performance with regard to vibration suppression.
구재량(Koo, Jae Raeyang),배용채(Bae, Young Chae),이두영(Lee, Doo Young),김희수(Kim, Hee Soo),손석만(Son, Suk Man),김동환(Kim, Dong Hwan) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The damages of overhead electrical transmission lines by the icing and the snow accretion lines may be significant enough in some cases to cause broken strands in conductors and to result in complete failure of phase conductors and to destroy even the supporting structures. Galloping, sleet jump and unbalance snow accretion are typical physical phenomenons that are closely related with ice and snow build-up on transmission lines. It is fundamentally impossible to prevent the phenomenons completely in advance because ice and snow build-up is much weather-dependent. Therefore, various devices and techniques have been proposed and used for preventing or at least minimizing its effects. In this paper, typical damages caused by ice and snow build-up are introduced and the advanced techniques to protect equipment are described.