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Study of the Transmission Error Prediction of a Five-speed Manual Transmission System
Sang-Pil Cho(조상필),Dong-Gyu Lee(이동규),Lae-Sung Kim(김래성),Zhe-zhu Xu(허철수),Sung-ki Lyu(류성기) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
For the manual transmission gearbox used in the automotive industry, gear meshing transmission error is the main source of noise known as gear whine, and radiated gear whine noise plays an important role in the whole gearbox. Therefore, in order to keep competitive in the automotive market, the NVH performance of transmission gearboxes is increasingly important for automotive manufacturers when a new product is developed. In this paper, in order to achieve an optimized tooth contact pattern, gear tooth modification is applied to make up for the deformation of the teeth owing to load. A five-speed MT gearbox is firstly modeled in RomaxDesign software and the prediction of transmission error under the loaded torques is studied and compared. From the simulation, the transmission error and maximum contact stress are also simulated and compared after tooth modification of the loaded torques. Finally, the simulation results are used to optimize the whole gearbox design and the final gearbox prototype is testified to obtain NVH performance in a semi-anechoic room.
Lattice Boltzmann Method를 이용한 마이크로 채널 내 Droplet 형성에 대한 수치적 모사
김래성(Lae-Sung Kim),김효근(Hyo-Geun Kim),정해권(Hae-Kwon Jeong),하만영(Man-Yeong Ha),김경천(Kyung-Chun Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, the lattice Boltzmann method is discussed for simulating droplet formation in a microchannel. Droplets are formed by the hydrodynamic instability on the interface between two immiscible fluids when two immiscible fluids are imported simultaneously in a microchannel. Shan & Chen model (1993), which is a lattice-Boltzmann model of two-phase flows, is used to treat the interaction between immiscible fluids.
A Study on the Comparison of Transmission Error Prediction for a Helical Gear Pair
Lae-sung Kim(김래성),Qi Zhang(장기),Chang Choi(최창),Longjun Liang(양용군),Sung-ki Lyu(류성기) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.2
In recent years, world is faced with a transportation energy dilemma, and the transportation is almost dependent on a single fuel – petroleum. However, Hybrid Electric Vehicle (HEV) technology holds more advantages to reduce the demand for petroleum in the transportation by efficiency improvements of petroleum consumption. Therefore, there is a trend that lower gear noise levels are demanded in HEV for drivers to avoid annoyance and fatigue during operation. And meshing transmission error (T.E.) is the excitation that leads to the tonal noise known as gear whine, and radiated gear whine is also the dominant source of noise in the whole gearbox. In this paper, the analysis of gear tooth profile and lead modification is firstly presented, and then, the different transmission error of no mesh misalignment and mesh misalignment under one loaded torque for the 1st gear pair of HEV gearbox was investigated and compared. At last, the appropriate tooth modification was used to minimize and compare the transmission error of the gear pair with mesh misalignment under the loaded torque.
Immersed Boundary-Lattice Boltzmann 방법을 이용한 2차원 비압축성 유동에 관한 수치적 연구
김래성(Lae-Sung Kim),정해권(Hae-Kwon Jeong),최호진(Ho-Jin Choi),하만영(Man-Yeong Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, the immersed boundary-lattice Boltzmann method is discussed for the two-dimensional viscous incompressible flow computations. This approach uses a new computational method, the lattice Boltzmann method for the computation of the flow field and the immersed boundary method to treat the body geometry. The method of feedback momentum forcing (Goldstein et al., 1993) is applied to satisfy the no-slip boundary condition on the immersed body. The driven cavity flows with the stationary and oscillating immersed bodies are employed as the test cases of this approach.
Study on Tooth Micro-geometry Optimization of Rear Gear Set in 2 Speed Planetary Gear Reducer
전민형,김래성,노승윤,진진,최창,류성기,Jeon, Min-Hyung,Kim, Lae-Sung,Noh, Seung-Yoon,Zhen, Qin,Choi, Chang,Lyu, Sung-Ki The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.5
Gear tooth micro-geometry modifications include the intentional removal of material from the gear teeth flanks, so that the shape is no longer a perfect involute. If the gear shapes are perfect, then the gear tooth meshing is better, therefore the gears will transmit input torque in a more efficient manner without the generation of high frequency engine fluctuation noise. In this paper, we study tooth micro-geometry optimization of rear gear set in 2 speed planetary gear reducers. Analysis revealed problems which are need of modification. Based on the results, tooth micro-geometry was used to deal with load distributions on the rear gear set.
A Study on the Design and Performance Test of Side Thruster
Hyeong-Min Kim(김형민),Lae-Sung Kim(김래성),Sung-Hyun Cho(조성현),Sung-Ki Lyu(류성기) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
In this paper, we present a study concerning the design of a 400 N class side thruster for small ships. The side thrusters used in Korea are imported from abroad. The performance and durability of the imported products employed in Korea are not adequate, therefore the side thrusters which will be suitable for Korean domestic needs to be re-designed. The strength calculation of the side thruster was performed by KS standard. Strength calculation and design were made to meet design requirements. Structural analysis and safety factor analysis were carried out to confirm the validity of strength calculations and design. After manufacturing the bevel gear, a back lash test was conducted. We also conducted a no-load test, a rated load, and an overload test for a performance test and a durability test of the design while satisfying the design conditions.
가상경계 유한차분 볼츠만법을 통한 2 차원 원형 실린더 주위 유동에 관한 수치적 연구
김두현(Doo-Hyun Kim),정해권(Hae-Kwon Jeong),김래성(Lae-Sung Kim),양희주(Hui-Ju Yang),하만영(Man-Yeong Ha) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper presents a 2-D numerical simulation of fluid flow around a cylinder using immersed boundaryfinite difference lattice Boltzmann method(IB-FDLBM). This method is a combination and utilizes the most desirable feature of the finite difference lattice Boltzmann method and the immersed boundary method. The FDLBM uses a Eulerian grid for the flow domain and the immersed boundary is represented with a finite number of Lagrangian points. Bluff body wake interference and its effect on drag and lift force are studied. The drag and lift coefficient are compared with previous experimental and numerical results for various Reynolds number.
Study on Tooth Micro-geometry Optimization of Rear Gear Set in 2 Speed Planetary Gear Reducer
Min-Hyung Jeon(전민형),Lae-Sung Kim(김래성),Seung-Yoon Noh(노승윤),Qin Zhen(진진),Chang Choi(최창),Sung-Ki Lyu(류성기) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
Gear tooth micro-geometry modifications include the intentional removal of material from the gear teeth flanks, so that the shape is no longer a perfect involute. If the gear shapes are perfect, then the gear tooth meshing is better, therefore the gears will transmit input torque in a more efficient manner without the generation of high frequency engine fluctuation noise. In this paper, we study tooth micro-geometry optimization of rear gear set in 2 speed planetary gear reducers. Analysis revealed problems which are need of modification. Based on the results, tooth micro-geometry was used to deal with load distributions on the rear gear set.
Lattice Boltzmann 방법을 이용한 비혼합 유체의 상호작용에 대한 모사
김효근(Hyo-Geun Kim),김래성(Lae-Sung Kim),하만영(Man-Yeong Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper deals with the lattice Boltzmann method to simulate the interactions between immiscible fluid. Lattice Boltzmann method treats the fluid properties at the microscopic kinematics, therefore it is capable of handling various thermodynamic properties of a fluid system, such as multiple phase flows. There are some models to express the interactions between immiscible flows, such as Shan & Chen model(1993) and Red and Blue model(Rothman et al., 1991). We investigate the interactions between immiscible fluids by lattice Boltzmann method using Shan & Chen model.
Study on the Tooth Micro-Geometry Optimization of Planetary Gear for Drive Reducer
노승윤(Seung Yoon Noh),김래성(Lae Sung Kim),조성현(Sung Hyun Cho),류성기(Sung Ki Lyu) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.6
A popular approach to optimize the performance of a gear transmission system is the modification of the gear tooth microgeometry, which includes the intentional removal of material from the gear teeth flanks, so that the shape is no longer a perfect involute. Such modifications compensate teeth deflections under load, and the resulting transmission error is minimized under a specific torque. Therefore, micro-geometry modifications can be applied on the involute (or profile) and lead of the gear teeth. In order to study the tooth micro-geometry optimization, this research selected a mass produced planetary gear type drive reducer as a prototype. The original design was modeled by a commercial software named Romax Designer, which analyzes and optimizes different types of gear power transmission systems. The series analysis results obtained reveal some anomalies that require modification. Based on the result, optimization and gear tooth modification were done to deal with the load distributions on gear tooth, gear durability problem, safety factor and bearing life problem. This thesis presents the outstanding performance improvement obtained after such optimization.