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조타감 성능 목표 달성을 위한 모델 기반 MDPS 제어맵 최적화 설계
박영대(Youngdae Park),이병림(Byungrim Lee),장세현(Sehyun Chang),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.9
The development of the steering feel performance of a vehicle is primarily carried out by tuning the motor-driven power steering(MDPS). The motor-driven power steering provides a lot of parameters for developers in order to maximize the steering feel performance. However, it needs a lot of time and effort, so the development efficiency is not favorable. In order to improve the development efficiency, this paper proposes an optimal design method and process of MDPS logic as follows. First is the definition of quantitative targets for multiple tests that may indicate steering feel performance, second is the construction of the vehicle and control model for checking the steering feel performance, and third is the process proposal to optimize the MDPS logic parameters. This method and process is validated through the comparison of the simulation and test results.
조타감 성능 목표 달성을 위한 모델 기반 MDPS 제어맵 최적화 설계
박영대(Youngdae Park),이병림(Byungrim Lee),장세현(Sehyun Chang),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.10
The development of the steering feel performance of a vehicle is primarily carried out by tuning the motor-driven power steering(MDPS). The motor-driven power steering provides a lot of parameters for developers in order to maximize the steering feel performance. However, it needs a lot of time and effort, so the development efficiency is not favorable. In order to improve the development efficiency, this paper proposes an optimal design method and process of MDPS logic as follows. First is the definition of quantitative targets for multiple tests that may indicate steering feel performance, second is the construction of the vehicle and control model for checking the steering feel performance, and third is the process proposal to optimize the MDPS logic parameters. This method and process is validated through the comparison of the simulation and test results.
반동체 웨이퍼 고속 검사를 위한 GPU 기반 병열처리 알고리즘
박영대(Youngdae Park),김준식(Joon Seek Kim),주효남(Hyonam Joo) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.12
In a the present day, many vision inspection techniques are used in productive industrial areas. In particular, in the semiconductor industry the vision inspection system for wafers is a very important system. Also, inspection techniques for semiconductor wafer production are required to ensure high precision and fast inspection. In order to achieve these objectives, parallel processing of the inspection algorithm is essentially needed. In this paper, we propose the GPU (Graphical Processing Unit)-based parallel processing algorithm for the fast inspection of semiconductor wafers. The proposed algorithm is implemented on GPU boards made by NVIDIA Company. The defect detection performance of the proposed algorithm implemented on the GPU is the same as if by a single CPU, but the execution time of the proposed method is about 210 times faster than the one with a single CPU.
박영대(Youngdae Park),유일수(Ilsoo Yoo),구정서(Jeongseo Koo),권태수(Taesoo Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Buffer stop are normally defined as steel structure at track end, in such places as railway station, depot or siding etc" Firstly it serves as warning marks for the end of a track, Secondly, in the event of a train impact it is their task to absorb the resultant energy to minimize the damage or the potential damage so that neither the impacting train, the passenger or the environment might be damaged or injured. In domestic technology of buffer stop, there have been totally ineffective design up to current day, that is, rigid and immovable buffer stop without any energy absorbing capability have been used on the track as a stop made from steel or concrete, Therefore, sturdy on the concept design for buffer stop to minimize damage of railway vehicle and passenger in the event of vehicle impacting was carried out in this paper.
이병림(Byungrim Lee),조현석(Hyunseok Cho),박영대(Youngdae Park),황상우(Sangwoo Hwang),김민준(Minjun Kim),장세현(Sehyun Chang) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.4
In this study, we will determine the optimum position of the steering gear bush application and the hardness of the bush. The test cases are extracted by the design of the experimental method while considering the tolerance of the mounting part of the steering gear. The 3-point mounting bush application position of the steering gear is selected via rack friction, friction force variation evaluation, and response evaluation. For the bushes with different hardness in the position, the method of selecting the final conforming specification through the response, friction force, and rattle noise evaluation was used. This method is considered to be applicable to the steering gears with a 2-point or a 4-point mounting structure.
R&H 성능 최적화를 위한 다중해 기반 대화형 목표전계 기법 개발
장세현(Sehyun Chang),이병림(Byungrim Lee),박영대(Youngdae Park),조현석(Hyunseok Cho),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
This paper proposes Multiple-solution based interactive target cascading. Compared with a classical point-based design which is aimed to optimize an objective function subjected to given constraints, the proposed method performs sensitivity analysis for the range of design variables (DV) first. Then multiple solutions are obtained by performing optimization for subdivided target performance index (PI) range. The set of all data such as DV and PI is stored in database so that a designer can choose a best design set using DB query and data visualization which provides the insight of the connection between DV and PI graphically. The proposed multiple-solution based interactive target cascading is implemented to improve the vehicle handling performance, particularly enhancing frequency responses of sine sweep steer and maximize the linearity of lateral acceleration during constant radius cornering. It shows that the proposed approach may be useful not only for the conceptual stage in the early phases of vehicle development but also during the development stage to enhance vehicle performance.
핸들링 목표 성능 달성을 위한 타겟 캐스케이딩 기반 서스펜션 설계
조현석(Hyeonseok Cho),이병림(Byungrim Lee),장세현(Sehyun Jang),박영대(Youngdae Park),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.9
Target cascading methodology is a design approach that determines the design variables by propagating targets from upper level to lower level. Design efficiency can be improved by partitioning the entire system in an ordered hierarchical structure and propagating the design targets of the upper level to the lower level in stages. It is particularly useful when designing complex systems, such as automotive vehicle design. The problem of one complex system can be solved more easily by dividing it into several steps and replacing it with a small, simple problem. It can also help us to better understand the relationships and trade-offs between the various subsystems that determine the overall performance of the entire system. In this paper, a method is proposed to set quantitative handling performance targets by correlation model between subjective and objective evaluation using the kriging method, and to design suspension components satisfying it by applying the target cascading methodology.
조현석(Hyeonseok Cho),이병림(Byungrim Lee),장세현(Sehyun Jang),박영대(Youngdae Park),김민준(Minjun Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Vehicle has the characteristics that steering wheel is returned a neutral state automatically when release the hand. Such steering returnability originating from tire forces and moments. And reaction torque is generated through the rack and column depends on suspension and steering geometry. It is important to accurately predict and design because steering returnability is related to steering performance. In this study, vehicle modeling including steering and suspension friction model is performed to estimate steering returnability. And then using DOE(Design Of Experiments) contribution analysis. Through this process to confIrm the root cause and propose ways to improve for remaining angle and laterality after returned a steering wheel.
김민준(Minjun Kim),이병림(Byungrim Lee),장세현(Sehyun Chang),박영대(Youngdae Park),조현석(Hyunseok Cho),황상우(Sangwoo Hwang) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
Column type of motor driven power steering(C-MDPS) system has been developed for driving convenience and fuel efficiency. Nowadays, it requires agile vehicle response when driver tries to steer the steering wheel. So rack type MDPS(R-MDPS) system is often considered to improve vehicle response, but it is difficult to apply due to package problem and high cost. This paper proposes a design methodology about C-MDPS vehicle in terms of maximizing vehicle response. Among various design parameters which affect vehicle response, this paper deals with steering and suspension system design factors. The main parameters in the steering system are component characteristics such as friction level or torsion bar stiffness. The main parameters in the suspension system are kinematic and compliance (K&C) characteristics such as lateral force stiffness or kinematic displacement. In this paper, influence analysis method and optimization process for these factors are suggested.
R&H 성능 산포 개선을 위한 민감도 분석 및 공차 설계
조현석(Hyeonseok Cho),이병림(Byungrim Lee),장세현(Sehyun Chang),박영대(Youngdae Park),김민준(Minjun Kim),황상우(Sangwoo Hwang) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
Recently, many people use cars not simply as a means of transportation, but also as a means to enjoy the act of driving the vehicle. In addition, various vehicle performance, such as ride comfort and handling stability, are being required. In response to these needs, car companies are committed to developing vehicles by improving the driving performance starting from the design phase. Research for the improvement of ride comfort and handling stability is becoming more important with the increasing sophistication of cars. This paper describes a process by suspension and steering components of the dispensing system in order to review the effect on driving performance by using an analytical method, and utilizing the DOE for the review to derive the most definitive factor regarding performance variation.