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맥퍼슨 현가 장치를 가진 차량의 승차감 개선을 위한 SRS 해석 및 Design Study
이철훈(Chulhoon Lee),최진호(Jinho Choi) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the analysis and design study for improving the Smooth Road Shake (SRS) performance which is one of the most important ride metrics in modem vehicles. The SRS is composed of the steering wheel and floor pan vibrations caused by tire imbalance forces. This study focuses on the steering wheel torsional vibration since the floor pan longitudinal and vertical vibrations are much smaller than the torsional vibration. We performed the fundamental dynamic simulation of SRS by using ADAMS solver based on Motionview with in-house templates. We showed the validity of our SRS model through the comparison of a simulation result with a production vehicle's result. Based on the validated model, we performed design study, and provided design guidelines for enhancing the SRS performance.
무인 굴착기 버츄얼 검증을 위한 자율 작업 시뮬레이션 기술 개발
이철훈(Chulhoon Lee),이제필(Jepil Lee),박흥근(Heungkeun Park),김창묵(Changmook Kim),김동목(Dongmok Kim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In addition to the recent development of autonomous vehicles, technologies for automation and unmanned construction equipment are being actively developed in order to increase work efficiency in the field of construction site as well as solve the problem of lack of skilled workers in construction equipment operation. Doosan Infracore is actively developing unmanned/automated equipment and site management solution called X-center as shown in Concept-X demonstrations in 2019. As part of this solution development, we are also developing a simulation technology for virtual verification of autonomous equipment. The unmanned excavator recognizes the work terrain and the surrounding environment of the equipment from the results sensed by Lidar and SVC (Stereo Vision Camera), and trajectory planner controller generates the work command of the excavator according to the work mode such as digging and loading, trenching and grading. Since the automated work is carried out in several stages and the system configuration is complicated, virtual verification through simulation before the actual vehicle test can increase the development efficiency and product reliability. In this paper, we developed the simulation technology and the process for autonomous Excavator by coupling perception system, trajectory planner controller, vehicle dynamics model, and virtual sensor and terrain.
굴삭기 선회 디바이스 기어의 Case Crushing 강도 평가 기술 개발 및 설계 최적화
이철훈(Chulhoon Lee),성두현(Doohyun Sung),김광수(Kwangsoo Kim),김경근(Kyeongkeun Kim),임규운(Gyuun Im),박흥근(Heungkeun Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Case Crushing failure mode may occur in hardened gears that are subjected to large torque, such as excavator swing device pinions and swing bearing gears. In Case Crushing failure mode, the crack is generated at case core boundary in hardened gears, unlike pitting or bending fatigue which is general gear failure modes. In this paper, the Case Crushing strength analysis methodology was developed and design optimization was performed to improve Case Crushing strength for large size excavator swing bearing gear. For more accurate result, the swing device system was modeled with considering the influence of pinion shaft deformation, roller bearing stiffness, and gear lead slope that is one of the micro geometry. The gear lead slope was optimized by using developed detail analysis model under various swing torque condition.
엔진 Cover류 방사 소음 해석 기술 개발 및 구조적 개선 설계안 도출
이철훈(Chulhoon Lee),김광수(Kwangsoo Kim),오종민(Jongmin Oh),임규운(Gyuun Im) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Recently, exhaust regulations have intensified due to the global warming and air pollution problems. For this reason, the research is being done competitively to develop a higher specific power engine and fuel efficiency engine by weight reduction and engine down-sizing. Although these weight reduction and high power engine development trend is a disadvantage for a NVH performance of the engine, NVH characteristic may be an important performance index to ensure the competitiveness of the product with an increase of customer demand for the noise and vibration performance. These days, CAE analysis technique has been developed actively to predict the NVH performance in the early stage of product development and our company also is studying to predict NVH performance of the engine by using CAE analysis technology by continuously. In this paper, the analysis process for the structural borne noise of the engine covers is developed as one of the NVH analysis and analytical DB is built by performing an assessment of the production model. Also, noise performance of the engine TGC Cover is evaluated by using the analysis process, and structural improved design is recommended based on the analysis results in the development stage.
초기 개발 차량의 승차감 및 조정안정성 향상을 위한 현가장치 SDF 분석에 관한 연구
이철훈(Chulhoon Lee),최진호(Jinho Choi) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In order to develop a competitive modern vehicle with high quality, major big companies have tried to aggressively introduce virtual engineering technology based on state-of-the-art computer-aided engineering(CAE). This paper deals with a simulation-based design study of suspension system in the early stage of vehicle development. For the study, we have used ADAMS/Car for modeling front and rear suspension system including steering system, and then used ADAMSlInsight for a design of experiment(DOE) study. To show the validity of simulation model. the simulation results of the base model were compared with the test results. Based on the validated model, we have performed a DOE study of suspension system static design factors(SDF) for enhancing ride & handling performance of an initial development vehicle. To examine the dynamic response of the vehicle with the proposed suspension, we have performed some handling simulations after building a full vehicle simulation model including PT, brakes, tires, sprung body by using data of base mother model.
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.
맥퍼슨 현가 장치를 가진 차량의 Lower Control Arm Bush 특성과 Steering Wheel PMI 변화에 따른 SRS 개선 연구
서정원(Jungwon Seo),이준희(Junhee Lee),이철훈(Chulhoon Lee),김인동(Indong Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper aims to explain the effect of elastomeric rear bushing characteristics of lower control arm and steering wheel PMI for improving the Smooth Road Shake (SRS) performance which is one of the most important ride metrics in modern vehicles. Even though the SRS Metric is formed by two driver interfaces: steering hands lateral, SHY, and Floor Pan vibrations caused by tire imbalance forces, this study focuses on the steering wheel lateral vibration since the floor pan longitudinal and vertical vibrations are much smaller than the steering wheel lateral vibration. The results are shown in this paper by objective measurement. Also this paper explains how much LCA rear bush characteristics of lower control arm and steering wheel PMI influences minimizing smooth road shake of steering wheel.
소형차량에서 LCA Bush Stiffness 변화에 따른 차량의 운동성능 및 승차감 고찰
서정원(Jungwon Seo),전영운(Youngwoon Chun),이철훈(Chulhoon Lee),원영섭(Youngsub Won) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper aims to explain both ride trend and the effect of elastomeric bushing stiffness of lower control ann to be applied in a small car. Even though many car companies apply hydraulic lower control arm bush as an enabler for better ride comfort over the mid size car., most of small car is fitted with elastomertic bush of lower control arm. It is very difficult to fulfill the good ride and handling performance with elastomeric lower control arm bushing of a small car. So it is necessary to understand relationship between vehicle performance and bush stiffness change of lower control arm. All the results are shown in this paper not only by subjective evaluation but also objective measurement. Also this paper explains which is proper rear bush stiffness of lower control with minimize degradation on Vehicle Dynamics area in the small car. Vehicle performances are also affected both suspension type and characteristics of many suspension components. But those factors are not considered in the paper in order to focus on rear bush stiffness of lower control arm.
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.