http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
성덕환,김형의,이근호,김현수,Seong, Deok-Hwan,Kim, Hyeong-Ui,Lee, Geun-Ho,Kim, Hyeon-Su 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
In this paper, power flow characteristics of a hydromechanical transmission(HMT) are investigated using network analysis. The HMT used in this study consist of a hydrostatic unit(HSU), planetary gear sets, clutches and brakes providing forward 4 speeds and backward 2 speeds. Since the HMT power flows showing a closed loop and the HSU efficiency varies depending on the pressure and speed, a systematic approach is required to analyze the power transmission characteristics of the HMT. In order to analyze the closed loop power flow and the HSU power loss which changes depending on the pressure and speed, network model is constructed fur each speed range. In addition, an algorithm is proposed to calculate an accurate HSU loss corresponding to the experimental results. It is found from the network analysis that the torque and speed of each transmission element including the HSU can be obtained as well as direction of the power flow by the proposed algorithm. It is expected that the network analysis can be used in the design of relatively complicated transmission system such as HMT.
토크 분배방식 다경로 CVT의 변속 알고리듬과 응답특성
성덕환,김현수 대한기계학회 1994 대한기계학회논문집 Vol.18 No.11
A torque split type multi-pass CVT(MPC) system consiting of CVT and planetary gear train with 4 clutches was suggested to overcome the inherent inferior acceleration performance of CVT. Also, a shifting algorithm of MPC was suggested for the two driving modes : (1) power mode and (2) economy mode. By using the shifting algorithm and the MPC vehicle dynamic model, numerical simulations were performed to estimate the performance of the MPC vehicle. Simulation results showed that comparing the performance of the conventional 4-speed automatic transmission, an improvement in acceleration can be obtained by MPC for the power mode and 31% improvement in fuel economy for the economy mode.
동력특성과 속도비를 고려한 3축 정유압 기계식 변속기의 설계 연구
성덕환,김현수,Sung, Duk-Hwan,Kim, Hyun-Soo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
In this paper, a systematic design approach for a three shaft hydromechanical transmission(HMT) system is proposed by considering the power characteristics and speed ratio range. Using network analysis, possible configurations of the 3 shaft HMT are analyzed and it is found that the influence of HSU stroke on the power distribution of the HMT can be investigated by the network analysis. In addition, design methods are presented from the viewpoint of (1) power distribution and (2) speed ratio range. From the power distribution and the speed ratio range, a HMT configuration can be constructed, which minimizes the power circulation and provides the desired speed ranges. Based on the 3 shaft HMT analyses and the proposed design approach, a 3 shaft HMT is designed which provides 4 speeds in forward and 1 speed in reverse while keeping the power circulation less than 150% of the input power. It is expected that the design method suggested in this study can be used in a systematic design of the 3 shaft HMT.
HSU의 유량손실을 고려한 정유압 기계식 변속기의 동력특성 해석
성덕환,이근호,김형의,김현수,Sung, Duk-Hwan,Lee, Geun-Ho,Kim, Hyoung-Eui,Kim, Hyun-Soo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
An improved hydrostatic unit(HSU) model is proposed by considering the flow loss in order to analyze the power flow characteristics of a hydromechanical transmission(HMT) and a network analysis algorithm is presented to determine the torque and speed of each element of the HMT. To calculate the torque and flow loss of a pump and a motor in HSU, an effort and flow concept is introduced, which can be used to establish a torque and speed matrix in the network analysis. It is found from the network analysis that magnitude of the HSU stroke increases to maintain the same output speed in order to compensate the flow Boss in the HSU and the efficiency of the HMT shows the lowest value in the 1st speed since the HSU has the largest flow loss in the 1st speed and the flow loss decreases as the speed ratio upshifts.
성덕환(Dukhwan Sung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
A torque converter is used to start vehicle with automatic transmission because of good performance and low price. On the other hand, it has many disadvantages like low efficiency, hydraulic loss, heat generation, etc, which make fuel economy lower than manual transmission. In this paper, power split system for torque converter is proposed to improve fuel economy and performance of automatic transmission vehicle. Using network analysis and AVL cruise, twelve types of power split system structures are analyzed. A cruise performance simulation results show that the power split system for torque converter have better fuel economy than conventional automatic transmission vehicle.
성덕환(Dukhwan Sung),오종선(Jongsun Oh),조재호(Jaeho Cho),송경(Kyoung Song),권의섭(Eaisub Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, an optimization process for a torque converter performance using design for six sigma is presented. An optimization is performed to improve the fuel economy and drive performance of vehicle by optimizing torque converter capacity factor Cf. To optimize Cf curve, L18 orthogonal array is used for experiments design and 8 control factors and 4 noise factors are selected. The fuel economy and drive performance results are found from the vehicle performance simulation. After the normalizing and indexing of simulation results, the optimum torque converter Cf is deduced. Torque converter which can realize an optimum performance is designed by CFD analysis. The result shows that fuel economy can be improved by the optimization process.
성덕환(Dukhwan Sung),김현수(Hyunsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A power split system using torque converter is proposed. Using network analysis, two types of power split system structures are designed. It is found from performance simulation using AVL Cruise that the power split system adopting torque converter shows better fuel economy and acceleration performance than conventional automatic transmission vehicle.
[동력전달계부문] HSU의 유량손실을 고려한 정유압 기계식 변속기의 동력특성해석
성덕환(Dukhwan Sung),이근호(Geunho Lee),김형의(Hyoungeui Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
An improved hydro-static unit(HSU) model is proposed by considering the flow loss in order to analyze the power flow characteristics of a hydro-mechanical transmission(HMT) and a network analysis algorithm is presented to determine the torque and speed of each element of the HMT. To calculate the torque and flow loss of a pump and a motor in HSU, an effort and flow concept is introduced, which can be used to establish a torque and speed matrix in the network analysis. It is found from the network analysis that magnitude of the HSU stroke increases to maintain the same output speed in order to compensate the flow loss in the HSU and the efficiency of the HMT shows the lowest value in the 1st speed since the HSU has the largest flow loss in the 1 st speed and the flow loss decreases as the speed ratio upshifts.