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서보 모터의 가감속을 고려한 2ㆍ3차원 원호의 실시간 직선 보간
이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In CNC machining, a 3D(3-dimension) linear segment and a 2D(2-dimension) circular arc are general forms given by CAD/CAM system. Generally, the 2D circular arc machining is processed using dividing into some linear segments. A 3D circular arc also don't exist in the standard form of NC data. This paper present a algorithm and method for real-time machining of a circular arc(not only the 2D one, but also the 3D one). The 3D circular arc machining is based on the 2D circular arc machining. It only needs making a new coordinate system, converting given 3D points(a start point, a end point, and a center point of a 3D circular arc) into points of the new coordinate system, and processing a inverse transformation about a interpolated point. The proposed algorithm was implemented and simulated on PC system. It was confirmed to give a good result.
서보 모터의 가감속을 고려한 NURBS 곡선의 실시간 직선 보간
이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In this paper, a new parametric curve interpolator is proposed based on a 3D(3-dimensional) NURBS curve. A free curve is generally divided into small linear segments or circular arcs in CNC machining. The method has caused to a command error, the limitation of machining speed, and the irregular machining surface. The proposed real-time 3D NURBS interpolator continuously generates a linear segment within the range of allowable acceleration/deceleration in the motion controller. Therefore, the algorithm calculates the curvature and the remained distance of a command curve for the smoothing machining. It is expected to attaining high speed and high precision machining in CNC Machine Tool.
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.
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.