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FWD 승용차의 Torque Steer 해석 및 개선에 관한 연구
노승진(Seungjin Noh),이철훈(Chulhoon Lee),최진호(Jinho Choi) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the cause of the torque steer and a torque steer reduction process for a front-wheel drive car. High-power front wheel drive cars darted violently when to the right when full engine torque was applied, and darted equally violently back to the left when the power was cut. This is one of the most critical aspects of interaction between drive shafts and the steering system. Drive shaft angle, vehicle weight distribution. power train mount are mainly considered as the causes of torque steer. In addition, wheel alignment data such as kingpin offset, ride height, and dynamic tire radius are also discussed to solve the torque steer problem. This paper reviews torque steer parameter and describes a torque steer reduction process.
차량 쏠림 민감도 분석을 이용한 쏠림 개선에 관한 연구
노승진(Seungjin Noh),한성제(Sungje Han),황준효(Junhwyo Hwang),김상진(Sangjin Kim),이철훈(Chulhoon Lee),김우신(Woosin Kim),신상하(Sangha Shin),최진호(Jinjo Choi),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Vehicle pull is one of the most important problem on the vehicle quality from customers. To understand the vehicle pull, this paper describes vehicle pull phenomenon by considering causing factors of conicity and PRAT, vehicle factors of wheel alignment, and the external environment factor of road slope and weight. Those factors must be analyzed to improve the vehicle pull tendency. Therefore, by using Pull sensitivity analysis, vehicle pull simulation which makes it possible to consider the effect of passenger and road slope, PRAT, conicity and wheel alignment, is applied to evaluate and Steering Wheel Torque.
노승진(Seungjin Noh),박지훈(Jihun Park),신상하(Sangha Shin),최진호(Jinho Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper deals with a study on the roll center for improving handling performance. Roll behavior during the handling maneuver is one of the most important factors for fun-to-drive and handling stability. And the roll center is one of the important parameters on roll behavior as well as pitch motion. In this paper, a simple three degree of freedom model for the roll motion is firstly built up for identifying the relationship between K&C parameters and handling performance according to the variation of the roll center height. Secondly, detailed multi-body models are built up and handling simulations are performed using ADAMS to verify the effects of the simple model.
Brake Pull 개선을 위한 현가장치 기구설계에 대한 연구
노승진(Seungjin Noh),신상하(Sangha Shin),서정원(Jungwon Seo),백봉범(Bongbum Back) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A vehicle which has a weight condition of one passenger is shows pull/drift during braking. The brake pull can cause sudden vehicle drift. It is important vehicle characteristic because it is related straight-line driving stability. This pull/drift is caused by the difference between front left and right weight. So there is not fundamental solution without adjusting the weight. But suspension design can reduce the brake pull. This paper presents suspension design for pulling behavior during braking.
서정원(Jungwon Seo),노승진(Seungjin Noh),최영수(Youngsoo Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper aims to explain the effect of steering performance on vehicle pull. It is well know that vehicle pull characteristics is affected by road slope, tire PRAT/conicity, cross camber, cross caster and delta front corner weight.. This study focuses on the steering performance by influencing pulling performance since the steering characteristics can be tuned during vehicle development. In order to define steering characteristics on vehicle pull, several cars are used for objective measurement. The on-center handling test was conducted and good correlation was obtained between methodology of pulling sensitivity and actual test result. With the study of effect of steering performance on vehicle pull, it is results in required STG balancing for maximizing steering performance and minimizing vehicle pull.
Local Body Stiffness 변화에 따른 조향특성 연구
서정원(Jungwon Seo),노승진(Seungjin Noh),이준희(Junhee Lee),정현욱(Hyunwook Jeong),신상하(Sangha Shin),오정용(Jungyoung Oh) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper aims to explain the steering characteristics by changing local body stiffness. It is well know that body characteristics affect the quality of the dynamics of vehicles, such as handling performance, ride comfort and noise and vibration. This study focuses on the steering performance by changing local body stiffness since the steering characteristics are much affected by local body stiffness. In order to define local body stiffness effect, strut bar and reinforce shock tower are used for objective and subjective evaluation. The on-center handling test was conducted and good correlation was obtained between objective on center handling and subjective evaluation. With the study of on center handling test for local body stiffness, this paper explains the local body stiffness factor for enhancing steering performance.
토션빔 현가 장치를 가진 차량의 현가계 특성 변화에 따른 Floor SRS 개선 방안 연구
서정원(Jungwon Seo),김상진(Sangjin Kim),노승진(Seungjin Noh),황준효(Junhwyo Hwang),박수용(Sooyong Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper aims to explain the effect of suspension characteristics for improving the Floor Smooth Road Shake (SRS) performance which is one of the most important ride metrics in modern vehicles. The SRS Metric is formed by two driver interfaces: steering hands lateral, SHY, and Floor Pan Vibrations caused by tire imbalance forces. Even though the floor pan longitudinal and vertical vibrations are much smaller than the steering wheel lateral vibration, this study focuses on the floor SRS since drivers get affected by floor SRS. We performed the fundamental dynamics simulation of SRS by using ADAMS solver based on Motionview with in-house templates and objective measurement. Also this paper explains the dominant factor for enhancing the floor smooth road shake performance and design recommendations.