임원식 교수

Dynamic simulation techniques are developed to analyse the shift characteristics of the vehicle powertrain with automatic transmissions. In this study, the mathematical modelling of powertrain components such as engine, clutch system, planetary gear system and road load, is presented for the simulation. The clutch engagement condition, which determines the degree of freedom of the system, is also proposed. By using a detailed nonlinear model of torque converter, it is possible to accurately anal

<div class="htmlview paragraph">This paper describes a simulation procedure to calculate a torque converter performance. The study focuses the validity of a solution and the handiness of the procedure. A comparison of the numerical solution and the experimental solution proves the model validity. Moreover, handiness is achieved by using commercial code with automatic unstructured mesh generating techniques. With suggested procedure, a complete analysis is carried out relatively fast. And a

BACKGROUND: Serum alkaline phosphatase (ALP) is related to vascular calcification and is known to have a prognostic impact in various cohorts. However, evidence in patients undergoing thoracic endovascular aortic repair (TEVAR) is lacking. Thus, we hypothesized that preoperative serum ALP level could be used for predicting adverse events after TEVAR. METHODS: We retrospectively reviewed 167 patients who underwent TEVAR between February 2013 and December 2016. Patients were classified into tertil

A parallel type HEV has a power transfer device that is constructed by clutches and the device which is located between engine flywheel and electric traction motor is called 'Engine Clutch' When a traction motor of could not generate power to move, the HEV must launch only by engine power. In this situation the slip speed control and transmitted torque control are very important. In this study control strategies of dry type engine clutch is proposed to satisfy desired clutch engagement time and

This paper discusses about analyzing in-wheel vehicle's dynamic motion and load torque. Since in-wheel vehicle controls each left and right driving wheels, it is dangerous if vehicle's wheels are not in a cooperative control. First, this study builds the main wheel control logic using PID control theory and evaluates the stability. Using Carsim-Matlab/Simulink, vehicle dynamic motion is simulated in virtual 3D driving road. Through this, in-wheel vehicle's driving performance can be analyzed. Th