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소형차량에서 On Center Handling 시험에 따른 조향특성 고찰
서정원(Jungwon Seo),신상하(Sangha Shin),김상진(Sangjin Kim),최영수(Youngsoo Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper aims to explain the steering characteristics by on-center handling test on a small car. The on-center handling test is the one of the most popular objective test method for expressing steering characteristics. This is not a perfect test, but extremely useful. The on-center handling test has been developed as a means of quantifying control quality in the low lateral acceleration regime typical of expressway driving. The tests consists of a low frequency(0.2㎐) sinusoidal steer angle input at constant velocity, typically at 100㎞/h. The steering input magnitude is limited so that lateral acceleration does not exceed 0.2g. We performed many of benchmarking test for objective on center handling and subjective evaluation. With the study of on center handling test for small car, this paper explains the dominant factor for enhancing best steering performance.
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.
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.
김채원(Chae Won Kim),이육희(Yukhee Lee),신상하(Sangha Shin) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
This paper describes a method of mechanical friction modeling. The friction force is modeled at a pair of rigid bodies which has relative velocity on a point. Using the reaction body, a friction plane is defined whose normal is in local z direction. And using the action body, a friction point is defined where in-plane friction forces as well as normal force are applied. A set of mathematical formulations are set up including planar velocity, planar acceleration, directional vector components, small deflection of friction point, and friction coefficient variable. Proposed equations are applied to a commercial multi-body dynamics simulation code and practical example models. Built models show probable results even up to stationary zero speed or restart-stop and extensibility for further applications.
브레이크 저더 영향 요소 기여도 분석 및 개선 방향 제시
강수연(Sooyeon Kang),정명구(Myoungkoo Chung),신상하(Sangha Shin),김세혁(Sehyuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The brake judder at the high speed braking is caused by the geometric distortions of the brake rotor. There are difficulties in a developing brake system by the modern technology without the brake judder. Also an optimizing steering and suspension systems for the brake judder may be in conflict with the development of the ride & handling performance. For the customer satisfaction by minimizing steering wheel vibration especially affected by brake judder, car makers need to consider of the effective control factors to develop the steering and suspension system. The effective improvement method is suggested to reduce the brake judder by the CAE analysis of factors contributing to brake judder and its validation test in a vehicle.
서스펜션 민감도 해석을 이용한 SRS 성능 개선 방안 연구
장영진(Youngjin Jang),김국태(Guktae Kim),신상하(Sangha Shin),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper describes the sensitivity study and case study for improving the Smooth Road Shake (SRS) performance. Smooth Road Shake performance is one of the top quality concerns that directly affect vehicle sales. It is an important factor to ensure vehicle ride performance. So, the SRS design targets need to be defined and the proposed design needs to be assessed very early in the vehicle development phase. The SRS is composed of the steering wheel and floor panel vibrations caused by tire imbalance mass. This study focuses on the steering wheel torsional vibration resulting from the fore/aft walking mode of the corner caused by imbalance mass. We performed the fundamental dynamic simulation of SRS by using ADAMS solver based on Motionview with in-house templates. We showed the dominant factor for enhancing the SRS performance and we provided design recommendation.
서정원(Jungwon Seo),최영수(Youngsoo Choi),신상하(Sangha Shin) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper aims to explain the most influencing control factor on vehicle pull with Monte Carlo Simulation. It is well known that vehicle pull characteristics is affected by Spindle Length, KPI, Steer Arm Length, STG, Tire SLR, road slope, tire PRAT, cross camber, cross caster and delta front corner weight.. This study focuses on robust control factor to the noise factor. Here, cross camber, cross caster, delta weight, road slope is defined as a noise factor which is mostly affected by production tolerance and road environmental. The Monte Carlo Simulation was conducted and good simulation has been obtained. With the study on the Vehicle Pull Improvement using Monte Carlo Simulation, it shows that Steering Torque Gradient is the most influencing factor which is required balancing for maximizing steering performance and minimizing vehicle pull and Steer Arm Length, Tire PRAT Sensitivity is second and third influencing factor.
Engine Mount Bushing 최적화를 통한 차량 승차감 개선
장재원(Jaiwon Chang),김국태(Guktae Kim),신상하(Sangha Shin),박수용(Sooyong Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently car makers tend to use high-technology adopted parts because of customer’s highly increasing demand and automotive market trend. Engine mount bush works for effective power transfer & vibration reduction at the mounting point to the body. There are two type of bush. One is conventional-bush which made of rubber and the other is hydraulic-bush which consists of hydraulic fluid with rubber. Hydraulic-bush offers high quality ride comfort and advanced ride performance. But, it is more expensive than conventional-bush. Computer Aided Engineering(CAE) is significant tool which estimates vehicle’s performance in vehicle develop process because of time and money saving. This research provides introduction of DFSS(Design For Six Sigma) for robust design of each contribution bush character. based on DOE, we found effective factor, which influenced on ride comfort. Finally we suggest optimal value and validate improvement of ride comfort with Conventional Bush.
소형승용차의 Trip Rollover에 대한 Parameter Sensitivity에 관한 연구
유영선(Youngsun Yoo),강성기(Sunggi Kang),신상하(Sangha Shin),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper describes a study on the parameter sensitivity of small size vehicle trip (Curb trip, Soil trip) rollover. The trip rollover simulation model of small size vehicle was developed using ADAMS solver based on MotionView with in-house templates. The simulation model was correlated by VIMF and VHF test for suspension characteristic which effect on the rollover situation. The correlated model was used to simulation trip rollover, and the results of simulation were compared with experimental data obtained from theses test modes. A sensitivity analysis was completed for various parameters like platform initial speed, vehicle CG height, tread, roll inertia and roll stiffness.