단일겹치기이음시험을 이용한 합금화용융아연코팅강판의 코팅층 접합강도 평가

이정민(Jungmin Lee),이찬주(Chanjoo Lee),고대철(Daecheol Ko),이선봉(Seonbong Lee),김병민(Byungmin Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.6

This paper was designed to estimate the adhesion strength of galvannealed coatings on steel sheets. The adhesion strength were evaluated using single lap - shear tests where the lap joint was bonded by structural adhesive. Tests were performed for overlap length of 5㎜, 10㎜ and 15 ㎜ and three directions (0, 45, 90) of steel sheets used as the adherend of the overlap joint. After the tests, FE simulations of the single lap - shear test were also carried out to observe the stress distribution in the interface between the adhesive and the coated sheet. The results showed that the joint failure loads obtained from the tensile tests of bonded single lap-joints were the same, regardless of overlap lengths and directions of steel sheets. Also, the failure of galvannealed coatings greatly depended on shear stress distribution in the interface and the value was about 30㎫.

차량 전장시스템의 개방형 소프트웨어 설계를 위한 개발 방법에 관한 연구

이상진(Sangjin Lee),손장경(Jangkyung Son),이성훈(Seonghun Lee),김명진(Myungjin Kim),이선봉(Seonbong Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11

AUTOSAR(AUTomotive Open System ARchitecture) is established an open standard for automotive electric/electronic architecture. It will serve as a basic infrastructure for the management of functions within both future applications and standard software modules. The software based on AUTOSAR standard has flexibility, scalability and improved quality. In this paper, we analyze the specifications of AUTOSAR authoring tools and present a development method for the tools.

AEB 시험평가 방법에 관한 연구

김봉주,이선봉,Kim, BongJu,Lee, SeonBong 한국자동차안전학회 2018 자동차안전학회지 Vol.10 No.2

Currently, sharp increase of car is on the rise as a serious social problem due to loss of lives from car accident and environmental pollution. There is a study on ITS (Intelligent Transportation System) to seek coping measures. As for the commercialization of ITS, we aim for occupancy of world market through ASV (Advanced Safety Vehicle) related system development and international standardization. However, the domestic environment is very insufficient. Core factor technologies of ITS are Adaptive Cruise Control, Lane Keeping Assist System, Forward Collision Warning System, AEB (Autonomous Emergency Braking) system etc. These technologies are applied to cars to support driving of a driver. AEB system is stop the car automatically based on the result decided by the relative speed and distance with obstacle detected through sensor attached on car rather than depending on the driver. The purpose of AEB system is to measure the distance and speed of car and to prevent accident. Thus, AEB will be a system useful for prevention of accident by decreasing car accident along with the development of automobile technology. This study suggests a scenario to suggest a test evaluation method that accords with domestic environment and active response of international standard regarding the test evaluation method of AEB. Also, by setting the goal with function for distance, it suggests theoretic model according to the result. And the study aims to verify the theoretic evaluation standard per proposed scenario using car which is installed with AEB device through field car driving test on test road. It will be useful to utilize the suggested scenario and theoretical model when conducting AEB test evaluation.

국내도로 환경을 고려한 ACC 시험평가 방법에 관한 연구

김봉주,이선봉,Kim, BongJu,Lee, SeonBong 한국자동차안전학회 2017 자동차안전학회지 Vol.9 No.4

With automobiles sharply increasing worldwide, we are faced with serious social problems such as traffic accidents, traffic jams, environmental pollution, and economic inefficiency. In response, research on ITS is promoted mainly by regions with advanced automotive industry such as the US, Europe, and Japan. While Korea is working to get ahead to take global market through developing and turning into global standards systems related to ASV(Advanced Safety Vehicle), the country is not excellently prepared for such projects. The purpose of ACC is to control the vehicle's longitudinal speed and distance and minimize driver workload. Such a system should be useful in preventing accidents, as it reduces driver workload in the 21st-century world of telematics created by the development of automobile culture industry. In this light, the thesis presents a method to test and evaluate ACC system and a mathematical method to assess distance. Furthermore, for the proposed test and evaluation, theoretical values are tested with vehicle test and a database is acquired, by using vehicles equipped with an ACC system. We proposed the scenarios suitable for the domestic environment and conducted the actual road test. Theoretical evaluation criteria for developing ACC system may be employed and scenario-specific evaluation methods may find their useful application through testing the formula proposed by comparing the database and the mathematical method. and, many companies are expected to utilize the scenario in the developing stage of ACC, and be able to employ as a verification method by harnessing theoretical formula before a road test.

갈바어닐링온도변화가 합금화용융아연코팅의 합금상과 마찰특성에 미치는 영향

이정민(Jungmin Lee),김동환(Donghwan Kim),이선봉(Seonbong Lee),김동진(Dongjin Kim),김병민(Byungmin Kim) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.12

This paper is aimed to understand the effect of different galvannealing temperatures on the frictional properties and Fe-Zn intermetallic phases of the galvannealed (GA) coatings on steel sheets. Their galvannealing treatments were conducted at 465, 505, 515 and 540℃ for about 10s in the additional heating furnace of an industrial continuous hot-dip galvanizing line. The mechanical and the frictional properties of the coatings were estimated using nanoindentation, nanoscratch, micro vickers hardness tests and flat friction tests, which were performed at contact pressures of 4, 20 and 80㎫. Also, the correlation between the microstructure and the frictional properties of the GA coatings were investigated by SEM observation for the cross-section of the GA coating after and before flat friction tests. The results showed that the mechanical and the frictional properties of the coatings are strongly dependent on their phase distributions and microstructure. Especially, in low contact pressure of 4㎫ the frictional properties of the coatings were dependent on the surface phases and morphology, while in high contact pressure of 80㎫ it was influenced by their mechanical properties based on the dominant phase distributions.

차량 배기 머플러의 수명예측에 관한 연구

이태희(Taehee Lee),한인수(Insu Han),우종운(Jongwoon Woo),이선봉(Seonbong Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

The potential damage factor of the vehicle exhaust muffler are thermal shock, thermal stress due to exhaust gas and repetition of complex load from engine and road. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs for consumers. In this paper, the potential failure of the muffler cause and failure modes were studied. Acceleration model at the level of the scale parameter using maximum likelihood estimation was obtained. The acceleration model was applied to the Inverse Power model to determine the suitability.

홀센서리스타입의 BLDCM을 이용한 ETC 모듈의 고속 고정도 위치제어

이상훈(SangHun Lee),김병수(ByoungSoo Kim),천영덕(YoungDuk Chun),이선봉(SeonBong Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

This paper describes the high response and high precision position control of ETC module using BLDC motor without the hall sensor for detecting a rotor position. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analogue voltage output on the throttle valve instead of BLDC motor for detecting the rotor position. So the additional commutation information is necessarily needed to control the ETC module. For this, the estimation method is applied. In order to improve and obtain the high resolution for the position control, it is generally needed to change the gear ratio of the module or the electrical switching method etc. In this paper, the 3-phase switching between successive commutations is adapted instead of the 2-phase switching that is conventionally used. In addition, the position control with a variable PI gain is applied to improve a dynamic response during a transient period and reduce vibration at a stop in case of matching position reference. The mentioned method can be used to estimate the commutation state and operate the high-precision position control for the ETC module and the high response characteristics. The validity of the proposed method is examined through the experimental results.

ETC 구동용 BLDC 제어시스템의 홀센서리스 위치제어를 위한 신호처리기법에 관한 연구

이상훈(SangHun Lee),이선봉(SeonBong Lee),박철휴(CheolHu Park) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.5

This paper describes an signal processing method for the hall sensorless position control of ETC control system using a BLDC motor. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analog voltage output on the throttle valve instead of BLDC motor for detecting rotor position of motor. So the additional commutation information is necessarily needed to control the mentioned ETC module. In order to estimate and determine the commutation state, it is proposed to properly manipulate the resolution of A/D converter considering the mechanical parameter, that is, the number of motor slot and the ratio of reduction gear. Through this method, the estimation of commutation state for operating the system is possible and the discrete signal for commutation is stably obtained. The validity of the method is examined through the experimental results.

카메라 기반 야간 차선 인식율 개선을 위한 영상처리 알고리즘에 대한 연구

김흥룡(Heungryong Kim),이선봉(Seonbong Lee) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.1

In this paper, to control the existing headlamp control system using steering wheel angle more efficiently and more actively, image processing algorithm which improved the detection rate of lane at night based on camera was suggested. And to recognize road lane more clearly in the conditions of low illumination, new algorithms were developed in the aspects of improving brightness, extracting clear lane edge and using the characteristics of lane. Through this research, it turned out that lane detection ability by using the normalized stretching, angular mask and expected-area scan have good performance in the night compare to existing algorithms.

시간지연제어기법을 이용한 측 방향 미끄러짐 및 요 감쇠 보상 강인 조향 제어

권오석(Oh-Seok Kwon),이선봉(Seonbong Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In this paper we treat robust steering control using time delay control for the vehicle dynamics variation due to tire/road contact condition variation and lateral disturbance force due to side wind and yaw disturbance moment due to the difference between left tire's pneumatic pressure and right one's. And we deal with side slip and yaw damping compensation under fast steering at the high speed of vehicle. So we intend that a driver consider only path to go and do not have to consider vehicle dynamics variation, disturbances and undesired side slip and yaw oscillations. From the simulation results, we find out robustness for vehicle dynamics variation and disturbances when using time delay control and we evaluate side slip and yaw damping compensation capability under fast steering at the high speed of vehicle for the three control methods.