• Title/Summary/Keyword: Cad Program

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Development of Traction Unit for 2-motor Driven Electric Vehicle

  • Park, Jung-Woo;Koo, Dae-Hyun;Kim, Jong-Moo;Kim, Heung-Geun
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.950-954
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    • 1998
  • This paper describes a development of traction unit for 2-motor driven electric vehicle (EV). The traction unit is consisted with an interior permanent magnet synchronous motor (IPMSM), a reduction gear and an inverter for electric vehicle that is driven by 2 motors without differential gear. For traction unit, prototype IPMSM and inverter have been developed. The IPMSM was designed by CAD program that was developed with both equivalent circuit method and FEM. Also the inverter was developed to drive 2 motors with 6 legs IGBT switches in a control board. The vector control algorithm was implemented with maximum torque control method in the constant torque region and field weakening control method in the constant power region considering inverter capacity. To verify that the traction unit is more high efficiency and has more high power density than a traction unit with induction motor with the same power, we would like to show the results about the design and analysis of the IPMSM and the experiment results about the traction unit.

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The Study for Securing of Reliability of Landscape View Evaluation by Simulation Work - The simulation angle of view to the standardization of - (조망경관 평가를 위한 경관 시뮬레이션의 신뢰도 제고 연구 -시뮬레이션 화각 표준화를 중심으로-)

  • Park, Byeong Gy
    • KIEAE Journal
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    • v.13 no.1
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    • pp.109-123
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    • 2013
  • The study is to probe a technical alternative to enhance the reliability and accuracy of the results of various landscape simulations. This study to present technical criteria that are necessary in each stage of target site analysis, picture taking, and computer synthesis and, through these to present supplementary plans to enhance the reliability and accuracy of landscape simulations. In order to derive more practical and empirical results in terms of the reliability of the results of landscape simulations, examples that actually passed landscape review were selected. With regard to study process, an analysis was made first to analyze the landscape report data of designs that passed the review to analyze their characteristics, to be followed by an integrated analysis of problems that were revealed in various landscape simulations. Important factors that affect directly the work of landscape simulations such as the specification of camera lenses that were used in picture taking, distance, and angle. Design the work was carried out using Auto CAD, 3DS Max, and Photoshop program in the same way as in actual design. For verification of their accuracy and reliability, the results were entrusted to experts who have implemented similar jobs. To seduce differences from those too landscape simulations that conduct trial experiment of the virtual space that are to be created in the future with accurate numerical values.

Machining Technology of pinnacle Cutter Edge for Flexible Sheet Die (필름시트 절단용 다이의 절인 가공 기초연구)

  • Je T.J.;Choi D.S.;Whang K.H.;Lee E.S.;Hong S.M.;Choi J.S.;Song B.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.19-20
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    • 2006
  • As the Mobile and Display technology are being developed quickly, new wireless devices are released in great numbers. They reduce existing devices' life time and demand a reduction of developing period of portable devices. With these demands, existing film cutting mold used many films of portable devices, especially LCD Display, needs to be more precise, and cheaper. In this research, we have analyzed machining characteristics of cutter shapes, materials, and cutting conditions for application to other films. Cutter edge was machined by slot cutting method and CAD program to select the cutter shape and cutter angle. Also, we have determined the optimal cutting conditions using high speed machining experiments to improve the productivity.

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A Development of the Design System of the Progressive Stamping Dies by using Boundary Representation and Its Application (경계표현법을 응용한 순차 금형 자동 설계시스템 개발 및 적용)

  • Kim Yong Yun
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.2
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    • pp.126-132
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    • 2005
  • In this paper, an auto-design system is introduced for a stamping tool based on commercial computer aided design system with its drafting language. The auto-design system consists of tool oriented product design subsystem which modifies and configures the product drawing, tool concept design subsystem which make a design of the punches and their punching progression and parts design subsystem that makes automatic dimension. The system is applied to the mechanical design of the stamping tool. The main logic of the system is based on half-edge theory, a kernel for the 3 dimensional CAD system, which is applied to 2 dimensional drafting auto-design system. The auto-design system enables to conspicuously reducing the designing time of the tool. In addition, there is little drafting error that had been about 3% without auto design program. It is effective to reduce the development time for new products because of rapid designing time of the tools, standardization of the stamping tool and the drafting rule for the auto-design system. The auto-design system yields high efficiency of the tool manufacturing system.

Development of a Metering Device for a Garlic Clove Planter

  • Choi D. K.;Cho S. C.;Park S. H.;Kim J. Y.;Kim S. H.;Kim C. K.
    • Agricultural and Biosystems Engineering
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    • v.5 no.2
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    • pp.45-49
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    • 2004
  • Objective of the study was to develop a garlic clove metering device. The metering device consisted of a drum, a bucket and a bucket cover. A garlic clove simulator was designed to simulate motions of garlic cloves in the metering device. Simulation was performed using a multibody dynamic analysis program, RecurDyn version 5.1. Physical properties of garlic cloves such as mass and center of gravity were determined using 3D CAD modeler, IDEAS version 10.0. In order to compare the results of the simulation with actual movement of a garlic, movement of garlic clove was photographed by a high speed camera. A prototype metering device was built and tested under various metering speeds and metering guide angles. At the 12 rpm metering speed, rate of single-clove-discharge was $90.0\%$ and missing rate $1.3\%$ at $5^{\circ}$.

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Development of Expert System for Burr Formation in Face Milling (밀링가공시 버형성 예측을 위한 전문가 시스템 개발)

  • Ko, Sung-Lim;Kim, Young-Jin;Ko, Dae-Cheol;Han, Sang-U;Lee, Je-Yeol;Ahn, Yong-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.199-205
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    • 2001
  • Burr makes troubles on manufacturing process due to deburring cost, quality of products and productivity. This paper described the results of experimental study on the influence of the cutting parameters on the formation of exit burrs in face milling. Using the results of experimental study, burr types are classified and data bases are developed to predict burr formation result. From the CAD file for work geometry and the NC data for tool path, the exit angles are calculated at every edges. This program predicts the burr geometry at exit edges using the prediction algorithm and data bases which are developed experimentally. Simulation results on deformation strain and temperature are also available in specific 2-dimensional cutting conditions. Also algorithm which can determine the exit angle is proposed.

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Multibody modeling and Analysis on Difference of Pin-reaction Force and Vibration caused by Offset in Fixed Outer Ring Type Cycloidal Speed Reducer (다물체 모델링을 이용한 외륜 고정형 Cycloid 감속기의 Offset에 의한 핀반력 및 진동차이 분석)

  • Kim, Hong Ki;Lee, Ki Bok;Yoo, Hong Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.11
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    • pp.1057-1063
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    • 2012
  • A cycloid speed reducer is a type of the speed reducers. The cycloid speed reducer has a eccentric rotating motion and offset to avoid some problem of assembly, so it has a disadvantage for vibration. In this paper, a multi-body dynamic model is developed for a cycloid speed reducer and the dynamic behaviors of the reducer are investigated. The cycloid speed reducer consists of cycloidal plate gears, housing gear, input shaft, output pin and shaft, and eccentric bearings. Using a CAD program, each component of cycloid reducer is modeled based on the offset and multi-body simulations are performed using Recurdyn. As a result, the pin reaction force and the amplitude of bearing displacement are increased by the offset.

Computer Simulation of Sideways Overturning of Side-Loaded Mini-Forwarder (측면 적재형 소형 임내 작업 차량의 횡전도 시뮬레이션)

  • Shim, S.B.;Park, Y.J.;Kim, K.U.;Kim, J.W.;Park, M.S.;Song, T.Y.
    • Journal of Biosystems Engineering
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    • v.32 no.2 s.121
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    • pp.69-76
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    • 2007
  • This study was conducted to evaluate the sideways overturning stability of side loaded mini-forwarder. The model of a prototype was developed using a 3D CAD modeler and the performance was experimentally validated. The prototype model was run on the multibody dynamic analysis program, RecurDyn 6.0, to simulate motions when the model traversed over a circular bump on a inclined ground surface. The simulation was performed at a constant forward speed of 1.85 km/h under the loaded and unloaded conditions. The forward direction was also controlled to vary from 0 to 360 degrees with an increment of 10 degrees. Results of the simulation showed safe regions in which the mini forwarder could travel safely in terms of direction and slope of the ground. Even when the mini-forwarder was loaded by 20 logs of 3.6 m long and 12 cm diameter, it traveled safely within the ground slopes of 1 to 45 degrees by directions.

A Study on a Precise Control of Position and Orientation of Robot Gripper for Forming Parts Handling in High Temperature (고열 단조부품 핸들링을 위한 로봇 그리퍼의 방위 및 포지션 정밀제어에 관한 연구)

  • Jeong, Yang-Keun;Kim, Mim-seong;Jo, Sang-Young;Won, Jong-Beom;Won, Jong-Dae;Han, Sung-Hyun
    • Journal of the Korean Society of Industry Convergence
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    • v.19 no.2
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    • pp.88-94
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    • 2016
  • In this paper, we describe a new approch to control method of a four joints-robot gripper for the purpose of parts assemblying. The robot gripper is specifically modeled by using a 3D CAD program (ANSYS), considering artificial grippers, and then the proposed control method is illustrated through the dynamic simulation tool (Adams). Each gripper finger is individually controlled to be located at the optimal positions where the maximal joint torque can be calculated. To verified the effectiveness of the proposed control method, we proposed two cases for the reference position of gripper. By comparing the control performance of two method, the performance of the proposed control method was verified.

A New Global Routing Techniques for Gate Array (Gate Array의 Global Routing 기법)

  • Lee, Byeong-Ho;Jeong, Jeong-Hwa;Im, In-Chil
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.22 no.3
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    • pp.60-67
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    • 1985
  • A new glut bel routing technique for gate array is described in this paper. In former global routers the position of pins is considered to be in the center of the cell. So it is impossible to exactly estimate the number of signal lines passing through each channel. As a result, an overflow occurs and the overflow violates 100% wiring in detailed routing pro-cesses. Besides this, there are some problems in former global routers, for example, design time and cost, etc. This paper proposed a new algorithm in which pins ordering is considered to solve these problems. Using this algorithm, a global router is developed. Program experiments show the efficiency of the proposed algorithm.

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