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전용권(Yonggwon Jeon),박흥근(Heungkeun Park),이상규(Sangkyoo Lee),안영동(Yeongdong An) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Accuracy and calculation efficiency of vibration fatigue analysis in time domain are related to two major factors, the size of FE model and load data. If one can handle massive size of data easily, it can be the best case. However, handling a massive data is impractical and laborious in simulation environment. Thus, the size of FE model or load data must be reduced to reflect dynamic characteristics of massive size of data in the view of efficiency and suitability. This paper presents a new method of signal extraction technique, for ground vehicle (an excavator, a wheel loader, etc.), considering the statistical characteristics and fatigue damage equivalency. The extracted load data, with shorter time duration, satisfy statistical properties with respect to the original data.
이제필(Jepil Lee),박흥근(Heungkeun Park) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
This paper is about a co-simulation analysis of an excavator. The excavator is modeled as a three sub systems; engine, hydraulic, and structural system. Since the simulation model for each system is generated for specific purposes with different softwares, a proper methodology is needed to connect individual system models and analyse the integrated model. In this paper, the co-simulation strategy with an application example is introduced in detail.
VPD 프로세스를 적용한 휠로더의 동역학 및 내구 해석
최성근(Sungkun Choi),박흥근(Heungkeun Park),장한기(Hankee Jang),명성식(Seongshik Myeong) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper presents a dynamic and durability analysis of wheel loader using VPD process. In order to predict the dynamic behaviors of the wheel loader during the driving on the road with the bump, the analytical model of wheel loader was built up and the vehicle dynamic analysis was carried out using MSC.ADAMS/Car program. To Verifying the analysis results with experimental data, vertical acceleration of front axle and rear axle/frame were measured. Also, wheel loader was carried out fatigue analysis. From the analysis process, effective analysis method of wheel loader are proposed.
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.