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개폐 시 최소 간섭을 갖는 버터플라이 밸브 다시크의 설계
최영(Young Choi),부광석(Kwangsuk Boo),여홍태(Hongtae Yeo),허관도(Kwando Hur),김호관(Hokwan Kim) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.12
In this study, the design and analysis of a butterfly valve disk was performed to minimize the rubbing between the disk and the seat at opening and closing. The butterfly valve has double eccentric structure and the contact surface between the disk and the seat is a conical surface. At the instant of opening and closing the valve by the rotation of disk, the positions of zero contact point are changed. Also, if the cone surface is cut in the perpendicular direction to the rotation axis of the valve, the contour of cutting section is hyperbolic. Therefore minimum distance between the origin of the eccentric axis and the hyperbolic curve goes to the position of zero contact point. In order to consider the interferences between the disk and the seat, the thermal-structure coupled field analysis was performed by ANSYS.
유한요소해석을 이용한 헬리컬기어의 동적해석에 관한 연구
김흥섭(Heungseob Kim),윤승태(Seungtae Yoon),부광석(Kwangsuk Boo) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
In this paper, the analysis of the contact stress in helical gear tooth flanks presents due to impact loading such as the sudden engagement and disengagement of gear. The stress analysis was implemented for different roll positions to find out the most critical roll angle and dynamic analysis is performed for this critical roll position to evaluate variation of stresses and tooth contact force with respect to time. Dynamic analysis was implemented by Implicit time integration method in Abaqus/Implicit. In order to make the accurate results, Analysis was conducted in very short interval based on time.
이정석(Jeongseok Lee),윤문영(Moonyoung Yoon),부광석(Kwangsuk Boo),김흥섭(Heungseob Kim) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.12
기어소음의 근본적인 원인은 전달오차로 인해 발생하게 된다. 전달오차는 기어가 맞물릴 때 발생하는데 크게 정적전달오차와 동적전달오차가 있다. 이러한 오차들은 기어 이빨의 처짐 또는 치면 마찰에 의해 발생하고 이 요인들이 원인이 되어 기어 시스템에 진동이 발생하게 된다. 그리고 이 진동이 기어의 축으로 이동하게 되어 축을 떠받치고 있는 베어링에 전달되고 베어링에 전달된 가진은 최종적으로 기어의 케이싱으로 이동하게 되어 소음을 방출하게 된다. 본 논문에서는 이러한 전달오차에 의해 발생하는 최대 굽힘응력을 가지는 롤각을 찾기 위한 응력해석을 수행되었다. 본 논문에서는 이론적 바탕으로 설계되어 인볼류트 곡선을 가진 기어와 수정된 치형을 가진 기어의 전달오차에 대한 해석을 진행하였다. 또한, 급작스러운 작동이나 큰 백래쉬로 인해 발생하는 충격강도에 대한 영향을 알아보기 위해 유한요소해석을 통해 각각 정적 최대굽힘응력과 동적 최대굽힘응력의 결과를 이용하여 충격인자 값을 예측해 보았다. The fundamental reason for gear noise is transmission error. Transmission error occurs because of STE (static transmission error) and DTE (dynamic transmission error), while a pair of gears is meshing. These errors are generated by the deflection of the teeth and the friction on the surface of the teeth. In addition, the vibration generated by transmission error leads to excited bearings. The bearings support the shafts, and the noise is radiated after exciting the gear casing. The analysis of the contact stress in helical gear tooth flanks indicates that it is due to impact loading, such as the sudden engagement and disengagement of a gear. Stress analysis is performed for different roll positions, in order to determine the most critical roll angle. Dynamic analysis is performed on this critical roll position, in order to evaluate variation in stresses and tooth contact force, with respect to time. In this study, transmission error analysis was implemented on a spur and helical gear with involute geometry and a modified geometry profile. In addition, in order to evaluate the intensity of impact due to sudden engagement and significant backlash, the impact factor was calculated using the finite element analysis results of static and dynamic maximum bending stresses.
유한요소해석을 이용한 헬리컬기어의 동적해석에 관한 연구
윤승태(Seungtae Yun),이정석(Jungsuk Lee),윤문영(Moonyoung Yoon),김흥섭(Heungseob Kim),부광석(Kwangsuk Boo) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this paper, the analysis of the contact stress in helical gear tooth flanks presents due to impact loading such as the sudden engagement and disengagement of gear. The stress analysis was implemented for different roll positions to find out the most critical roll angle and the contact stress and dynamic analysis is performed for this critical roll position. Dynamic analysis was implemented by Implicit time integration method in Abaqus/Implicit. In order to make the accurate results, Analysis was conducted in very short interval based on time.
기어물림강성을 고려한 기어시스템 베어링진동예측에 관한 연구
김흥섭(Heungseob Kim),김병준(Byeongjun Kim),권용규(Youngkyu Kwon),부광석(Kwangsuk Boo),서창준(Changjun Seo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The transmission error in gear causes vibration in the gear system, which is transferred to the gear shaft and transferred to the bearing connected to the shaft. Throughout this process of transmission, vibration is amplified and eventually transferred to the housing of the gear system, which is released into the air by noise from the mechanical system. In this paper, we present predictions on analytical verification for bearing vibration reduction based on contact stiffness for the most widely used pair of spurs.
강희삼(Heesam Gang),Nquyen Van Quyet,강준복(Joonbok Gang),손현철(Hyunchul Son),이성범(Seongbeom Lee),부광석(Kwangsuk Boo),김흥섭(Heungseob Kim),윤득선(Duksun Yun) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Recently the hydraulic bushings in suspension and sub-frame system of a rear-wheel driving vehicle are adapted to improve ride quality and reduce noise and vibration. The dynamic stiffness and damping properties of these hydraulic bushings are highly dependent on the amplitude and frequency of excitation force as well as the static load, but analytical case studies about such dynamic responses are not enough. The dynamic stiffness and loss angle of a hydraulic bushing are a crucial purpose functions and it is significant to investigate the relation between the design parameter of internal structure and these functions. During the design stage of a hydraulic bushing with one fluid element, it is not easy to adjust the maximum frequency of loss angle to specific frequency of the most disruptive excitations due to geometry limitations of the fluid track. In this study, the design factors such as fluid flow passage, internal chamber, and internal stopper are selected to affect the dynamic characteristics of hydraulic bushing. And the analytical study is implemented in several hydraulic bushing configurations with different combination of design factors. The formulation with lumped parameter model about hydraulic bushing configurations is implemented and the variation of dynamic stiffness and loss angle is examined with MATLAB simulation in time and frequency domain. Finally the feasible and practical modeling method of hydraulic bushing will be proposed.
이정석(Jungsuk Lee),윤문영(Moonyoung Yoon),양갑진(Kapjin Yang),송정훈(Jeonghoon Song),제우성(Woosung Che),부광석(Kwangsuk Boo),김흥섭(Heungseob Kim5) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The fundamental reason of noise in gear system is transmission error due to deflection of gear teeth. The vibration from transmission error moves to shaft and bearing. This vibration generates bearing force which exite gear box and finally radiate as noise outside. Therefore, studying transmission error is the most important to predict which is the fundamental reason of gear noise. In this paper, transmission error due to teeth deflection was predicted and shaft torsion was not considered in order to find only teeth deflection. For this reason, shaft was modeled as rigid, and only gear pair was modeled as flexible body. transmission error was predicted by Abaqus, FEA program, and this was compared for Spur and Helical type.