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Technical Paper
Seungjae Lee, Junwan Tak, Sunsuk Ok, Jangdon Choi, Sangki Kim, Taeyeon Lee, Ealgoo Kim, Hakbong Kim, Jaehong Park
This paper describes the ground system model and algorithm for a ground level simulation tool. First, the modeling of an automotive ground system will be discussed and the algorithm for a simulation tool will be explained. We divided the model into a ground tree and a ground body. The ground tree model consists of resistance formed by the wires that connect the load to ground point with various structures and the ground body model consists of resistance between ground points in the car body. The wires with large current, such as engine ground cable, was modeled in detail by dividing the resistance into wire, bolt, and clamping resistance, in order to simulate the effect of increased contact resistance after durability test. The algorithm of the ground level simulation tool was designed to adjust the currents of the alternator, battery, and ground points in order to evaluate the various driving and load conditions.
Technical Paper
Gi-Ho Lee, Jong-Hoon Lim, Gi-Tae Kim
Ride quality of heavy duty truck becomes important item, due to long distance transfer and long time driving This study describes how to determine and evaluate design parameters related to cab suspension system through time and frequency domain analysis The spring and damper-stiffness of the cab suspension system were optimized by two objective functions, which consist of cab pitching acceleration peak level and vibrational absorbed power Cab pitching is the main item which should be studied for ride quality In an attempt at optimizing, we made use of “Taguchi Method”,which was applied to experiments and simulation. We made truck cab model by use of DADS, which is dynamic analysis software,in order to find out the cab motions The results of simulation and test of a heavy duty truck gave us the optimum design parameters, which were verified and confirmed by real vehicle test
Technical Paper
Dong Hoon Park, Tae Seok Seo, Do Gi Lim, Hee Bock Cho
This paper introduces mathematical equations for power loss calculations of major automatic transmission components. It also presents a theoretical investigation on contributions of each component's power loss to transmission total power losses. A computer program for automatic transmission efficiency calculation has been developed based on mathematical equations. Efficiency calculations for the Hyundai A4BF1 electronic 4 speed automatic transmission has been executed in order to validate the program. The calculated efficiency under various input and operating conditions - such as different input torque & RPM, transmission gear state, ATF temperature, torque converter clutch on/off - showed quite good agreement with the test results.
Technical Paper
SungChul Cha, Seung-Hyun Hong, Shahriar Sharifimehr
Abstract Fatigue behavior of two types of automotive steel, quenched and tempered SUJ2 and carburized SCM820PRH, which are applied as powertrain parts are studied. These two types of steel are different in their hardness distribution from surface to core. The hardness of quenched and tempered SUJ2 is homogenous, in contrast to that of carburized SCM820PRH (SCM) which decreases from surface to core. These steels are investigated in terms of their monotonic tensile properties and fatigue behavior. A number of predictive methods were used to describe the fatigue behavior of these steels. A simple predictive method is based on approximation of S-N curve from ultimate tensile strength. The well-known Murakami’s defect area method was also applied for the prediction of the high cycle fatigue strength.
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