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윤용산(Yong-San Yoon),김경수(Kyung Soo Kim),김선제(Sun Je Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Most hybrid vehicles employ the continuously variable transmission(CVT) currently as their choice of the transmissions. Recently, an automated geared transmission(AGT) or dual clutch transmission(DCT) is being tried for some hybrid vehicles for the better fuel economy than CVT hybrid. However, this AGT or DCT is using the automated clutches which require the hydraulic power in addition to the slippage in the clutch plate invoking some energy loss as well as wear. Also, they require a motor with significant power to match to the engine power. The clutchless geared smart transmission(CGST) has no clutch and the clutch function is performed by the planetary gear system controlled by a motor/generator. The hybrid vehicles using CGST are expected to have some merit in durability, fuel efficiency, and cost as they don"t have clutches which cause wear and slippage. The motor used for the clutch function is working in synergy(power merge) with the engine in driving the vehicle. The hybrid system suggested here may use only the motor with the engine off for slow vehicle speed and the engine is mobilized only when its power is required. Also, the hybrid vehicle here can be either mild hybrid or full hybrid by adopting a different capacity of battery with much smaller motor/generator due to the planetary gear system compared to the other hybrid vehicles. In this study, we are going to demonstrate the positive prospect of our new CGST hybrid system by comparing the system with AGT hybrid or DCT hybrid in practical aspects.
윤용산(Yong-San Yoon),김경수(Kyung Soo Kim),김선제(Sun Je Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Most hybrid vehicles employ CVT currently as their transmission. Recently, Hyundai suggested a new hybrid vehicle using a dual clutch transmission for its power train. However, if we utilize the capability of the servo motor attached to the planetary gear device employed in most hybrid vehicles, we may eliminate the clutches and its related devices without sacrificing the quality of the ride of the vehicle. The major function of the clutch system in the hybrid vehicle is to control the amount of torque transmitted even though its fine control is difficult. Now, if we control the servo motor attached to the planetary gear device, we may synchronize the input gear axis and output gear axis in the transmission before engagement and control the magnitude of the torque transmitted to the transmission by controlling the amount of increment in the motor torque. The torque transmitted to the transmission is determined by the linear summation of the torques at the engine axis and motor, and can be controlled for gradual change. In this study, we are going to show the positive prospect of our system by examining the durability and economy comparing with the hybrid vehicle having dual clutch transmission.
조영건,윤용산,Cho, Young-Gun,Yoon, Yong-San 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
This study deals with the vibration ride quality for passenger car when running on straight highway at the speed of 70km/h. Ten accelerations were measured at four positions, three axes each at the feet, hip, and head, and one axis at the back. Five seats that have different static sponge stiffness were used, and two subjects were participated. These accelerations were analyzed to produce the ride values such as component ride value and overall ride value. It was hard to see the difference of ride value by the change of sponge stiffness. However we could rank the ride quality by the total vibration exposed to passengers. From the transfer function between the hip and the foot, the fundamental mode was observed to be around 5.8Hz. Also the transfer function between the head and hip was studied. The optimal damping ratio of the seat was calculated according to the seat natural frequency with human weighting filter which makes the optimal damping ratio different from that without weighting filter.
박해수,손웅희,윤용산,Park, Hae-Soo,Shon, Woong-Hee,Yoon, Yong-San 대한의용생체공학회 1989 의공학회지 Vol.10 No.3
The initial impact at foot strike is produced by a slider type mechanical model, which can be measured using a force platform to evaluate various shoes. The lower extremity and foot motion was filmed by a 16mm high speed movie camera and several points on the rear half of the shoe and those near the trochanter and the lateral epicondyle were digitized to provide the linear and angular positions and velocities during impact. With these observed kinematics, a slider type foot strike simulator composed of guide rail and sliding dummy is designed. The simulator system makes the artificial foot of the dummy with running shoe on it to follow the foot strike motion. The dummy has the relevant mass-spring-damper system modeled after McMahon's. The motion of the model is drived by the gravity force and the generated motion alone with the ground reaction forces are monitored by the same procedures afore mentioned producing the initial foot strike impact similar to the onto observed in human gait.