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VPG 기법 개발을 위한 특수로 주행 시험 및 시뮬레이션
손성효(Sunghyo Son),김용연(Yongyun Kim),허승진(SeungJin Heo),계경태(Gyungtae Kye),윤중흠(Junghm Yoon) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
As an effort to enhance of the durability and breakdown performance of vehicle suspension system, multi-body dynamics has been applied into simulation and design recently. But because of the difficulties of construction of road profile and tire model, VPG(Virtual Proving Ground) simulation using those rarely has been studied. Instead of VPG simulation, a simulation with an idea based on VTL(Virtual Testing Lab) inputting forces into wheel center directly has been the main current in this area. This study shows a new approach to use tire model and road profile to make a simulation of VPG rather than VTL. For VPG simulation 2-dimensional road profiles of some special roads like weak pot-hole road and washboard road are measured and F-tire model for durability analysis was created. And as VTL simulation does, multi-body vehicle model composed by rigid body and linear/nonlinear force elements was used in this study. For validation of simulation results not only wheel forces but various signals of suspension components using strain gage were measured with road profile simultaneously. Using this VPG method it is expected to calculate the transferred forces to suspension system without wheel force signals and to define more accurate max-impact force levels to suspension components in early stage of design process.
자동 발렛 파킹을 위한 테스트 플랫폼 설계 및 주행 검증
우훈제(HoonJe Woo),손성효(SungHyo Son),문희창(HeeChang Moon),성경복(KyungBok Sung),김정하(JungHa Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper introduces an automated valet parking system (AVP) which applies an autonomous driving concept into the current parking assistant system (PAS). The present commercial PAS technology is limited into vehicle. It means vehicle only senses and controls by and for itself to assist the parking. Therefore, the present PAS is restricted to simple parking events. But AVP includes wider parking events and planning because it uses infra-sensor network as well as vehicle sensor. For the realization of AVP, the commercial steering system of a compact vehicle was modified into steer-by-wire structure and various sensors like LRF (Long Range Finder) and camera were installed in a parking area. And local & global server decides where and when the vehicle can go and park in the testing area after recognized the status of environment and vehicle from those sensors. GPS solution was used to validate the AVP performance. More various parking situations, vehicles and obstacles will be considered in the next research stages based on these results. And we expect this AVP solution with more intelligent vehicles can be applied in a big parking lot like a market, an amusement park, etc.
승용차 현가 시스템 내구시험을 위한 가진 입력 신호의 재현에 관한 연구
민병호(Byoungho Min),손성효(Sunghyo Son),허승진(Seung-Jin Heo),박태익(Taeig Park),김영선(Youngseon Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The road simulators in the laboratory have become a common tool within the automotive industry for evaluation of vehicle system durability performance. These simulators need appropriate input signal generation algorithm to realize the actual driving condition due to non-linear vehicle and test rig behaviour. From a control standpoint, the iteration algorithm has proven to be a very effective method for control of complex, multiple degree-of-freedom systems. The performances of iteration algorithm are evaluated based on the variance calculated form the error between the given field data and the regenerated data in the frequency domain. In this paper, the road profile replication algorithm is verified by applying Belgian road to the developed road simulator. The experimental results are included to evaluate the performance of this simulator. This road simulator provides considerable savings in cost, development time, and testing risk during developing automotive components.<br/>
국내도로면 특성평가를 위한 분류체계 및 성능지수 개발연구
최장한(Janghan Choi),손성효(Sunghyo Son),허승진(Seungjin Heo),노기한(Kihan Noh),최규재(Gyoojae Choi),임종순(Jongsoon Im) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
As a dynamic road profiling device, Accelerometer Established Inertial Profiling Reference (AEIPR) method has<br/> cost effectiveness and high reliability for road profiling. Road profiling tests using AEIPR method are performed on<br/> the special test tracks in KATECH and all kinds of domestic roads. The test results are shown and evaluated by<br/> International road evaluation Indexes and classification.
이훈희(Hoonhee Lee),손성효(Sunghyo Son),박기홍(Kihong Park),허승진(Seung-Jin Heo),이영찬(Youngchan Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, virtual engineering technologies using computer have been rapidly developed in the development process of vehicles. According to this trend, for performing of an accurate computer simulation, modeling technique has been a very important part. In the field of vehicle motion analysis or vibration analysis, it is very important to develop precise models of force elements, which has nonlinear and dynamic characteristics simultaneously. Suspension bushes, shock absorber, engine/transmission mounts, tire are the force elements showing those characteristics. In this paper, a modeling technique which uses neural network algorithm has been studied. Neural network can model the model's characteristics using the idea of repetitive learning. For applying neural network in modeling of force elements, G-bush of lower control arm has been used in this research. A real driving condition of G-bush was considered during test. And as the modeling algorithms, optimal design algorithms are implemented for repetitive training.