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부채형 밀폐공간내에서의 자연대류 열전달에 대한 공간각의 영향
배태열(Bae Tae-Yeol),권순석(Kwon Sun-Suk) 한국태양에너지학회 1993 한국태양에너지학회 논문집 Vol.13 No.1
온도가 다른 평행한 원형 벽 2개의 단열 벽으로 구성된 부채형 밀쳬 공간 내에서의 자연대류 열전달 현상을 유한 차분법으로 수치해석 하였다. Rayleigh수 10³-10^5, 공간각 30˚~180~의 범위에서 온도 분포 및 속도 분포를 나타내고 평균 Nusselt수를 /Nu=C(Ra_l)^m의 형태로 나타내었다. A numerical study of natural convection heat transfer confined by circular parallel walls at different temperatures and flat adiabatic walls is investigated for Rayleigh numbers from 10³ to 10^5 and sectorial angles from 30˚ to 180˚. It is used by a finite difference method to solve the governing equations. The results show velocity and temperature distributions.<br/> Mean Nusselt numbers are shown by /Nu = C(Ra_l)^m
지게차용 기계유압식 무단변속기의 기어류에 대한 강도해석
배명호,배태열,최성광,Bae, Myung Ho,Bae, Tae Yeol,Choi, Sung Kwang 유공압건설기계학회 2016 드라이브·컨트롤 Vol.7 No.4
The power train of a hydro-mechanical, continuously variable transmission for forklifts makes use of hydro-static units, hydraulic multi-wet disc brakes & clutches, and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission because of a strength problem. In the present study, we calculated the specifications of the complex helical & planetary gear train, and analyzed the gear bending and compressive stresses of the gears. It is necessary to analyze the gear bending and compressive stresses thoroughly for optimal design of the complex helical & planetary gears with respect to cost and reliability. In this paper, we analyze the actual gear bending and compressive stresses of complex helical & planetary gears using the Lewes & Hertz equation, and we also verify the calculated specifications of the complex helical & planetary gears by evaluating the results of the data of allowable bending and compressive stress using the Stress vrs Number of Cycles curves of gears.
지게차용 기계유압식 무단변속기 기어류의 굽힘 응력에 관한 해석적 연구
배명호(Myung Ho Bae),배태열(Tae Yeol Bae),최성광(Choi Sung Kwang) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.11
The power train of hydro-mechanical continuously variable transmission for forklift consists of hydro-static unit and complex helical and planetary gears. The complex helical and planetary gears are very important parts of a hydro-mechanical continuously variable transmission because of strength problem. In the present study, calculating specifications of the complex helical and planetary gear train and analyzing the gear bending stresses of the gears. It is necessary to analyze gear bending stresses confidently for optimal design of the complex helical and planetary gears in respect of cost and reliability. In this paper, analyze actual gear bending stresses of complex helical and planetary gears using Lewes equation, also verify the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending stress from the Stress - No. of cycles curves of gears.
배명호(Myung Ho Bae),배태열(Tae Yeol Bae) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The power train of hydro-mechanical continuously variable transmission for forklift makes use of hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission for forklift because of a strength problem. In the present study, calculating specifications of the complex helical & planetary gear train and analyzing the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for optimal design of the complex helical & planetary gears in respect of cost and reliability. In the paper, analyze actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, also verify the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, in this paper also analyze actual gear scoring and evaluate the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for forklift.
기계유압식 무단변속기용 기어트레인에 대한 위험속도 해석
배명호(Myung Ho Bae),배태열(Tae Yeol Bae),최성광(Sung Kwang Choi) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.4
The power train of hydro-mechanical continuously variable transmission (HMCVT) for 8-ton class forklift includes hydro-static units, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The helical & planetary gears are key components of HMCVT`s power train wherein strength problems are the main concerns including gear bending stress, gear compressive stress, and scoring failure. Many failures in power train gears of HMCVT are due to the insufficient gear strength and resonance problems caused by major excitation forces, such as gear transmission error of mating gear fair in the transmission. In this study, wherein excitation frequencies are the gear tooth passing frequencies of the mating gears, a Campbell diagram is used to calculate the power train gears’ critical speeds. Mode shapes and natural frequencies of the power train gears are calculated by CATIA V5. These are used to predict resonance failures by comparing the actual working speed range with the critical speeds due to the gear transmission errors of HMCVT’s power train gears.
지게차용 기계유압식 무단변속기의 기어류에 대한 강도해석
배명호(Myung Ho Bae),배태열(Tae Yeol Bae),최성광(Sung Kwang Choi) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.4
The power train of a hydro-mechanical, continuously variable transmission for forklifts makes use of hydro-static units, hydraulic multi-wet disc brakes & clutches, and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission because of a strength problem. In the present study, we calculated the specifications of the complex helical & planetary gear train, and analyzed the gear bending and compressive stresses of the gears. It is necessary to analyze the gear bending and compressive stresses thoroughly for optimal design of the complex helical & planetary gears with respect to cost and reliability. In this paper, we analyze the actual gear bending and compressive stresses of complex helical & planetary gears using the Lewes & Hertz equation, and we also verify the calculated specifications of the complex helical & planetary gears by evaluating the results of the data of allowable bending and compressive stress using the Stress vrs Number of Cycles curves of gears.