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Secondary Ride 해석을 위한 노면 생성 프로그램 개발
권형주(Hyungju Kwon),계경태(Kyungtae Kye),김영준(Youngjun Kim),박순조(Soonjo Park),장지현(Jihyun Chang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For the exact ride analysis, it is important that a road information should be modeled more precisely. There are two ways of studies in modeling road. One is the experimental method, measuring the road height and displaying the road information in the PSD level as is proposed by ISO, MIRA and Wong. The other method is to generate the road information based on the random signal and to analyze the dynamic response of the simple vehicle model driven through the uneven road. Considering that there is a certain relation between the roads that left wheel and right wheel are passing on, it is clear that the road for full vehicle simulation is essential. Therefore we intend to develop the RPG(Road Profile Generator) program in this research, which is used for generating the road profile according to the rule of ISO, MIRA and Wong standard. We can analyze the secondary ride characteristics of the vehicle more precisely through the full vehicle simulation using this ADAMS road file produced by the RPG, which is the basic study of secondary ride analysis.
라이다 기반 야지 환경 내 전방 노면 높이 프로파일 및 거칠기 추정 시스템
석지원,김소영,조재영,박정희,이채현,김양곤,조기춘 한국자동차공학회 2024 한국 자동차공학회논문집 Vol.32 No.5
Unmanned ground systems equipped with sensors, such as cameras, radar, and LiDAR, play a crucial role in detecting environmental conditions. Specifically, recognizing drivable areas in uneven terrain is essential in establishing stable navigation plans. Information on the oncoming road's height profile and roughness obtained from LiDAR sensors will help ensure safe navigation and effective control planning. This study introduces a real-time, LiDAR-based approaching road height profile and a roughness estimation system in perceiving unstructured outdoor environments. Considering the mechanical characteristics of the system, the proposed method estimates the driving path, and generates a road height profile by using LiDAR point clouds. Finally, we will be analyzing road roughness in the frequency domain, and will be classifying roughness based on the ISO 8608:2016 standard. Real-world experiments conducted in both off-road and on-road environments demonstrate the feasibility and effectiveness of the proposed system in estimating terrain roughness in real time
노면 Profile 형상 측정을 통한 Road Noise 영향도 연구
황성욱(Sungwook Hwang),나재봉(Jaebong Na),한진혁(Jinhyuk Han),성기득(Kideug Sung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Road noise is very important, having an influence on vehicle’s performance. To improve test and prediction method of road noise, this study considered the effect of road profile, exciting the tire’s tread. Therefore we should take account of road roughness, by measuring road’s surface though test rig. Because, The road surface Profile has a large influence on the sound emission level of tire / road noise. Consequently, firstly, we have measured the FRF of tire and the vibro-acoustic function of vehicle by indoor test. Secondly, to predict road noise, we have used vector synthesis technique, applying the transfer function of tire and vehicle. Finally, we have compared the results of outdoor test and prediction.
4축 유압 로드시뮬레이터의 노면형상재현을 위한 변위신호의 생성
김종태(Jongtye Kim),정상화(Sanghwa Jeong),김택현(Taekhyun Kim),류신호(Sinho Ryu) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Full scale durability test in the laboratory is an essential of any fatigue life evaluation of components of structures of the automotive vehicle. Component testing is particularly important in today's highly competitive industries where the design to reduce weight and production costs must be balanced with the necessity to avoid expensive service failure. Generally, hydraulic road simulator is used to carry out the fatigue test and the vibration test. In this parer, four-axial road simulator with hydraulic power and driving program to operate are made up. In case of real-vehicle, the top and bottom's displacement component of data realized by vehicle's wheel is the main component. The displacement road profile is realized by accelerometers. For the verification the real-vehicle experiment is executed and road profile obtained from the experiment is verified by four-axial road simulator.
내구입력하중 예측을 위한 3차원 가상 블록 벨지안 노면 생성
김동호(Dongho Kim),주상건(Sanggun Joo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
VPG(Virtual Proving Ground) is a very useful and effective method to predict the road load of a vehicle. A virtual full vehicle model and a virtual road are the necessary components of VPG. Belgian road is the representative road to evaluate the durability of a vehicle. Generally, 3-D virtual and sharp Belgian road(3-D VSBR) is generated by using the PSD(Power Spectral Density) for spatial frequency and random numbers. In this paper, 3-D virtual block Belgian road(3-D VBBR) is generated by considering the actual shape of the Belgian block which composes Belgian road. The VPG simulation using the 3-D VBBR is carried out to predict the variation of the road load according to the change of the weight condition of a vehicle.
김종태(Jongtye Kim),김철우(Cheolwoo Kim),김택현(Taekhyun Kim) 한국추진공학회 2010 한국추진공학회지 Vol.14 No.2
In the recent years, it is important to evaluate the durability and the reliability of the vehicle, aircraft, and structure. Especially, in case of the vehicle, the durability and reliability are tested by driving test after making prototype vehicles. However, these methods require many costs and efforts for the experiment are needed to react the defects of product. This problems can be settled by simulator which supplies the realistic environments. In this parer, four-axial road simulator with hydraulic power and driving program to operate are made up. The displacement road profile is realized by accelerometers. For the verification the real-vehicle experiment is executed and road profile obtained from the experiment is verified by four-axial road simulator.
김효준(Hyo-Jun Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper presents the road profile sensing (RPS) algorithm and its application to electrically controlled suspension system using preview road information. The RPS algorithm using multi sensor system has been implemented in a real car. Through experimental work, it can robustly reconstruct the road input profiles from the intermixed data with the vehicle’s dynamic motion. A controller with preview control scheme is designed in the framework of active/ semi-active suspension system based on the 7 degrees of freedom full vehicle model, the control performance is evaluated through simulation work.
노면정보 인식 정확도 향상을 위한 LIDAR 센서 기반 차량 피치 각 추정 기술에 관한 연구
이용기(Yongki Lee),문병찬(Byungchan Moon),강태완(Taewan Kang),소민우(Minwoo Soh),박기홍(Kihong Park) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
According to recent increases in ongoing consumer interest for vehicle ride comfort and driving performance improvement, the research and development of the automotive industry are being actively conducted to satisfy them. And the chassis control system using preview road profile have been developed by car manufacturers. It is important to measure the exact preview road using environment sensors. But, changing the geometry of the vehicle, such as roll and pitch motion is the interference to extract an accurate preview road. So, In this paper, based on the Kabsch algorithm and SVD(Singular vector decomposition) technique, the pitch estimator of the vehicle was developed to improve the preview road recognition accuracy by using LIDAR sensor. Also, Through MATLAB/Simulink and virtual sensor simulation tool, it was performed the pitch estimation algorithm in various verification scenarios.
김연태(Yon-Tae Kim),김민석(Min-Seok Kim),이정한(Jeong-Han Lee),유완석(Wan-Seok Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
For the evaluation of ride quality and durability analysis of vehicle components by computer simulation, it is indispensable to consider nonlinear characteristics of tire and road. Most linear tire models are restrictive to represent this effect in the simulation. This paper proposes how to regenerate the road profile which preserves the measured wheel accelerations at the wheel center with linear tire model. The new road profile compensates for the difference of wheel acceleration between experiment and simulation using the frequency response function. The validity of the method was verified by appling to a 1/4 car model.
최경락(G. R. Choi),전승배(S. B. Jeon),황성호(S. H. Hwang) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.3
The road simulators have become common tools within the automotive industry for evaluation of vehicle and vehicle system durability performance. These simulators need appropriate input signal generation algorithms to realize the actual driving conditions due to non-linear vehicle and test rig behaviour. Although somewhat unconventional from a control standpoint, the iteration approach has proven to be a very effective method for control of complex, multiple degree-of-freedom systems where the tracking parameter is known a priori. In this paper, the road profile replication algorithm is verified by applying Belgian road to the developed road simulator. The simulation and 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.