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이창노(Changro Lee),박혁성(Hyuksung Park),김영관(Youngkwan Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The influence of braking force generated by one tire on vehicle dynamics was investigated by simulation and ground test. For simulation 8 d.o.f vehicle model was developed and fo vehicle test the special device to apply brake pressure to individual wheel was built. As a result of comer braking test on straight driving the dynamic responses such as yawrate, lateral acceleration and roll angle were produced in the vehicle and were coincident to the simulatio results. This shows that comer braking used in VDC system can control vehicle dynamics to improve controllability and stability .
유압조향계 비선형 진동시스템에 대한 요인분석 및 영향도 평가
최성근(Sungkun Choi),이창노(Changro Lee),전귀남(Kwinam Jun),임철훈(Choulhoon Lim),이현주(Hyunjoo Lee),박광칠(Kwangchil Park),현상학(Sanghak Hyun) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a study on the rotational vibration sensitivity of automotive hydraulic power steering systems. In order to describe non-linear dynamic coupling effects between the steering rack-pinion gearbox and the hydraulic sub-system, we build two different models and co-simulate the mechanical system based on multi-body dynamics and the power system based on the hydraulics. The frequency responses of the steering wheel to the rack force are obtained to compare the experimental results. The agreement between simulation and experimental results shows the validity of the co-simulation model. The sensitivity analysis for the factors, such as rack friction, valve opening area, torsional stiffness and the inertia of the steering wheel are carried out by the design of experimental method. From the factor analysis results the effective methods to reduce the steering wheel vibration are proposed.
SPMD장비를 활용한 초소형전기차 현가장치의 K&C 특성분석
김영렬(Youngryul Kim),김종수(Jongsu Kim),이준호(Junho Lee),이창노(Changro Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The ultra-small vehicle has a passenger-type and cargo-type depending on its use, and the width of the car is less than 1.5 meters, which is advantageous for driving on narrow roads in urban areas or rural areas. In particular, most ultra-small vehicles are electric vehicles driving by electric motors, and although regulations on vehicle certification have been in place for more than 30 years in Europe, laws were enacted in July 2018 and speed restrictions of less than 80 kph were imposed in Korea. Because of the size of the vehicle, the design freedom of the vehicle, such as the weight distribution of the vehicle related to the handling stability of the vehicle, the center of gravity of the vehicle and the inertial moment, and the type of suspension/steering system, is more disadvantageous than that of ordinary vehicles. In this study, various vehicle dynamics parameters produced by vehicle specifications, suspension and steering systems were measured through SPMD for the two types of ultra-small vehicles previously designed, and the values were compared with ordinary vehicles to identify inferior parameters and their degree of inferiority, and the selection of parameters to offset them and the design measures to implement them were established to contribute to the enhancement of handling stability of ultra-small cars.