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스퍼 기어의 유한요소해석 조건에 따른 전달 오차 경향성 분석
김재승,손종현,김민근,이근호,김수철,Jaeseung Kim,Jonghyeon Sohn,Min-Geun Kim,Geunho Lee,Suchul Kim 한국전산구조공학회 2023 전산구조공학 Vol.36 No.2
Finite element analysis is widely used to predict the structural stability and tooth contact performance of gears. This study focused on the effect of finite element modeling conditions of a spur gear on the simulation result and the model simplification. The gear body and teeth, teeth width, configuration of mesh, frictional coefficient, and simulation time interval (gear mesh cycle division) were selected for model simplification for gear analysis. The static transmission error during a single-gear mesh cycle was calculated to represent the performance of the gear, and the elapsed time was measured as a simplification factor. Contact stress distribution was also checked. The differences in maximum transmission error and elapsed time depending on the model simplification methods were analyzed. After all simplification methods were estimated, an optimal combination of the methods was defined, and the result was compared with that of the most detailed modeling methods.
김재승(Jaeseung Kim),김수철(Suchul Kim),손종현(Jonghyeon Sohn),문상곤(Sanggon Moon),이근호(Geunho Lee) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.12
본 논문은 회전익기용 엔진 감속기 주 기어열의 기어 웹 형상 최적화에 대해 기술하였다. 최적화 목표는 총중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값의 최소화로 설정하였으며, 기어의 웹 두께, 웹과 축의 연결 위치, 웹과 림의 연결 위치를 설계변수로 선정하였다. 최적화 과정에서 기어의 웹, 축, 림은 3D 캐드 모델로부터 유한요소 모델로 변환되었으며, 기어 해석 프로그램 MASTA에 입력되었다. 최적화 알고리즘은 NSGA-Ⅱ를 사용하였다. 최적화 결과 주 기어열의 총 중량, 전달 오차, 정렬 오차, 치면 하중 분포 계수 값은 모두 감소하였으며, 최대 응력도 안전한 수준으로 나타나서 전반적으로 기어 성능이 개선되었음을 확인하였다. This paper presents an optimization of gear web design used in a main gear train of an engine reduction gearbox for a rotorcraft. The optimization involves the minimization of a total weight, transmission error, misalignment, and face load distribution factor. In particular, three design variables such as a gear web thickness, location of rim-web connection, and location of shaft-web connection were set as design parameters. In the optimization process, web, rim and shaft of gears were converted from the 3D CAD geometry model to the finite element model, and then provided as input to the gear simulation program, MASTA. Lastly, NSGA-Ⅱ optimization method was used to find the best combination of design parameters. As a result of the optimization, the total weight, transmission error, misalignment, face load distribution factor were all reduced, and the maximum stress was also shown to be a safe level, confirming that the overall gear performance was improved.
기어 비틀림각이 회전익기용 동력전달장치 1차 감속부의 경량설계에 미치는 영향
최재훈(Jaehoon Choi),김수철(Suchul Kim),김재승(Jaeseung Kim),문상곤(Sanggon Moon),손종현(Jonghyeon Sohn) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.12
A turboshaft engine, which is typically used as a rotorcraft engine, offers a high-speed output, whereas the rotor of a rotorcraft features a low rotational speed; therefore, considerable speed reduction is required to transmit power from the engine to the rotor. The gears of the first reduction stage for high-speed input are typically mounted either on a turboshaft engine or on a main gearbox that is separate from the engine. Similar to most rotorcraft components, these gears require weight minimization. The specifications of a helical gear set for the first reduction stage are determined while accounting for weight minimization. The specifications for the gear are calculated using an optimization method involving NSGA-III. The gear helix angle is a key determinant of the support bearings to be used. Hence, the gear specifications are calculated for a case with an unfixed helix angle and for four cases with fixed helix angles. The gear train of each case, which contains gears, shafts, and bearings, is modeled using SMT MASTA (a gearbox design software). The weight change of the gear train with respect to the helix angle is investigated.