http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
부품간의 접촉을 고려한 유연체모델을 이용한 엔진 밸브트레인의 동특성 해석
황원걸(Won-Gul Hwang),성원석(WonSuk Sung),안기원(Ki-Won Ahn) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.1
The dynamic characteristics of valve train are responsible for the dynamic performances of engine. We derived the equation of motion for 6 degrees of freedom model of the valve train. Computer model is also developed with flexible multibody model considering contact between components. The simulation results with these two models are compared with experimental results. We investigated the effect of the two spring models, TSDA (Translational Spring Damper Actuator) element and flexible body model, on the valve behavior and spring force. It is found that the dynamic behavior of the two models are not very different at normal operational velocity of the engine. By modeling contact between cam and tappet, the stress distributions of the cam were found. Using stress distribution obtained, contact width and contact stresses of the cam surface were calculated with Hertz contact theory.
황원걸(Won Gul Hwang),김우영(Woo Young Kim),임형은(Hyung Eun Im) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.3
ABSTRACT<br/> When developing a large bus, damper curves are primarily tuned to improve the ride and handling characteristics through the subjective feeling test. In order to save time and efforts, the optimization method is used to obtain the optimum characteristics of the dampers and springs which can improve ride and handling performance. We made a full vehicle model which consists of a body, rigid axles in the front and rear, air springs, dampers, tires, and steering system. An airspring and a damper are modeled including the nonlinear characteristics. <br/> We performed the damping and airspring curve optimization. The objective function for handling performance is RMS(Root Mean Squares) of the roll angle, roll rate, yaw rate, and lateral acceleration at the center of gravity of a body during a double lane change. And the objective function for ride comfort is WRMS(Weighted RMS) of the power spectral density of the vertical acceleration at the driver's seat, middle seat and rear seat. Design variables are the damping characteristic curves expressed by damping coefficient and damping exponent and air spring characteristic curves calculated by curve fitted experimental data.<br/> Since ride and handling performance have opposite characteristics, validity of optimum design system for suspension was examined by comparing changes for handling performance indices according to weighting factors.<br/>
유연체 동역학 모델과 전력전자 회로의 연동해석을 통한 단기통 왕복 압축기 거동해석에 관한 연구
성원석(Won-Suk Sung),황원걸(Won-Gul Hwang) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.1
The characteristics of vibration and noise of a compressor used for electric appliances have significant influence on the quality of the products. For improvement on the quality of electric appliances, investigations for understanding the dynamic behaviour of the compressor are essential. Since Virtual Lab for the dynamics model and MAXWELL for the electromagnetics model are separate software programs with no interface, the joint simulation of the models could not be performed. This study suggests a way to develop the compressor model capable of the joint simulation with MATLAB/SIMULINK linking a flexible multi-body dynamics model, a torque model, and an electricity control model. The compressor model is found to be able to perform I/O data transfer among the sub-models and joint simulation. The simulation results of the flexible body and rigid body dynamics models were compared to check availability of the joint simulation system. In addition, the simulated vibration and driving torque of the compressor mechanisms were compared with measurements. Through the simulations, the influence of springs and LDT on the dynamic behaviour of the compressor was examined. This study examines the influence of the dynamic behaviour of the compressor mechanisms through joint simulation of the flexible multi-body dynamics model and electromagnetic circuit allows analysis.
안기원(Ki-Won Ahn),최기섭(Gi-Seob Choi),임형은(Hyung-Eun Im),황원걸(Won-Gul Hwang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
The strength analysis for the trunnion shaft of dump truck is carried out with dynamic model and FEM model. Reaction forces of the trunnion shaft are calculated with DADS for the case of straight line driving and severe lane change manoeuvre. The calculated reaction forces are used to analyze the stresses of the trunnion shaft using MSC/NASTRAN. The safety design criterion is suggested to the important part such as trunnion shaft.<br/> <br/>