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이제필(Jepil Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In most case, construction equipment is working under severe conditions which in the actual working conditions. So, definition of actual load is very important for designers and engineers of construction equipment company. For this reason, definition of working load is dependent on the actual test. But it takes a lot of times and money, and it is impossible until the completion of Proto Model. In this paper, it is introduced that wheel loader’s simulation model for measuring stress of front system. The simulation model consists of dynamic model and hydraulic model using ADAMS and MATLAB. ADAMS model of wheel loader front is modeled of flexible body for determine the stress. Finally, by comparing the experiment and analysis result, simulation model is verified.
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.
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.
뉴턴ㆍ비뉴턴 유체의 유변학적 특성 측정을 위한 자가 구동 측정장치의 개발
김승준,박준홍(Junhong Park),이제필(Jepil Lee),정성빈 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The experimental method to measure the rheologicdal properties of Newtonian of non-Newtonian fluids are proposed. The effects of fluids on flexural wave propagation characteristics of the composite beam structure attached PZT is analyed and used in measuring viscoelastic properties. The PZT of composite beam structure is used for self-sensing system. Fluid-structure interaction has effects on the wave propagation characteristics. To monitor this change, frequency dependent variations of complex wavenumber of composite beam structure and fluid-structure interaction analysis are performed. To account for the fluid-structure interaction effects, the fluids are modelled as a simple viscoelastic support at one end of the beam. The measured properties are dynamic shear modulus and loss tangent. Using the proposed method, the rheological properties of various non-Newtonian fluids are measured. Viscosity standard fluids are tested to verify accuracy of the proposed method and the results show the same viscosity value of the standard fluid which os offered by manufacturer. Compared to general rotational type rheometer which has been widely used in measuring dynamic properties, the proposed method requires simple experimental setup, and it is flexible to select frequency ranges of data acquisition.