• Title/Summary/Keyword: Tool Structure

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ALE-Based FSI Simulation of Solid Propellant Rocket Interior (ALE 기반의 고체 로켓 내부 유체-구조 연계 해석)

  • Han, Sang-Ho;Choi, H.S.;Min, D.H.;Kim, C.;Hwang, Chan-Gyu
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.510-513
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    • 2008
  • The traditional computational fluid or structure dynamics analysis approaches have contributed to solve many delicate engineering problems. But for the most of recent engineering problems which are influenced by fluid-structure interaction effect strongly, traditional individual approaches have limited analysis abilities for the exact simulation. Owing to above-mentioned reason, nowadays fluid-structure interaction analysis has become a matter of concern and interest. FSI analysis require several unprecedented techniques for the combining individual analysis tool into integrated analysis tool. The Arbitrary Lagrangian-Eulerian(ALE, in short) method is the new description of continum motion,which combines the advantages of the classical kinematical descriptions, i.e. Lagrangian and Eulerian description, while minimizing their respective drawbacks. In this paper, the ALE description is adapted to simulate fluid-structure interaction problems. An automatic re-mesh algorithm and a fluid-structure coupling process are included to analyze the interaction and moving motion during the 2-D axisymmetric solid rocket interior FSI phenomena simulation.

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A Study Based on Quantifying Theory for a Non-fiction Creation Tool : Focus on Comparative Analysis of and (정량화 이론을 활용한 논픽션 창작도구 모델 연구 : <소트 오피스> 및 <스토리헬퍼> 비교분석 중심으로)

  • Lyou, Chul-gyun;Park, Eun-kyung
    • The Journal of the Korea Contents Association
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    • v.16 no.3
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    • pp.247-256
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    • 2016
  • This paper points out that the existing digital story creation tools are biased in the field of entertainment storytelling, so it proposes a specialized tool for non-fiction creation. This paper selects Quantifying Theory to design this tool. When creating nonfiction storyline, it is important to have the appropriate combination between the actual events and fictional elements. A Gossip System, based on Quantifying Theory, is suitable for that work. Before designing a Gossip System as a nonfiction creation tool, this analysis evaluated that the Gossip System in and . As a result, the linked structure in is useful in searching for material for non-fiction creation, and the separated structure in is ideal for arranging dramatic events. This paper proposed a method of switching the fact to fiction through a combination of this two Gossip System structure. I conclude that this is the best method for non-fiction creation tool.

The control characteristic evaluation of Desktop machine tool (Desktop 가공기의 제어특성 평가)

  • 박종영;이득우;김정석;정우섭
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.137-140
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    • 2003
  • Recently, as the demand of small-sized precision parts is rising in precision industry such as mobile, automobile, optic. etc. the requirement of small-sized machine tool is increasing. Desktop machine tool define small-sized machine tool that is able to install in table. According to diminishing in size, Desktop machine tool is able to economize production cost by reducing work area and consuming electric power. But Desktop machine tool generates vibration in acceleration and deceleration modes by inertia force of moving part. Also vibration is generated when it move simultaneously two axis or three axis. Such generating vibration situation is reason of declining stiffness of machine tool structure because of smallizing in size. And this vibration has a large effect on precision of machining products. Therefore, evaluating of the control characteristic is necessary for minimizing vibration of machine tool as much as possible to accomplish precision machining of small-sized parts

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Machining Characteristics of Micro Structure using Single-Crystal Diamond Tool on Cu-plated Mold (단결정 다이아몬드공구를 사용한 Cu 도금된 몰드의 미세 구조체 가공특성)

  • Kim, Chang-Eui;Jeon, Eun-chae;Je, Tae-Jin;Kang, Myung Chang
    • Journal of Powder Materials
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    • v.22 no.3
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    • pp.169-174
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    • 2015
  • The optical film for light luminance improvement of BLU that is used in LCD/LED and retro-reflective film is used as luminous sign consist of square and triangular pyramid structure pattern based on V-shape micro prism pattern. In this study, we analyzed machining characteristics of Cu-plated flat mold by shaping with diamond tool. First, cutting conditions were optimizing as V-groove machining for the experiment of micro prism structure mold machining with prism pattern shape, cutting force and roughness. Second, the micro prism structure such as square and triangular pyramid pattern were machined by cross machining method with optimizing cutting conditions. Burr and chip shape were discussed with material properties and machining method.

A Study on the Analysis of causes & minimizing of Defects at Composite Materials Sandwich Structure reinforced with Honeycomb core in Autoclave Processing (하니콤 코어로 보강된 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안)

  • 권순철;양철문;최병근;이세원;한중원;김윤해
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.11a
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    • pp.21-29
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    • 2000
  • The Purpose of this paper is to determine the effect of the autoclave inner pressure rate, heat-up rate, tool round angle, Thickness of core, height of joggle on defects, and to minimize the defects of aircraft sandwich structure reinforced with honeycomb core occurred in autoclave processing. The results showed that the geometry of aircraft sandwich structure and tool such as tool round angle, Thickness of core, height of joggle, and the autoclave cure conditions such as inner pressure rate, heat up rate strongly affected the core movement, core wrinkle, bridge phenomenon of prepreg and depression of core that occurred in autoclave processing.

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Design of EDM Machine Tool Structures for Microfactory with High Stiffness and Damping Characteristics (마이크로팩토리 용 미세방전 공작기계의 고강성/고감쇠 설계)

  • Kim, Ju-Ho;Chang, Seung-Hwan
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.205-211
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    • 2007
  • In this paper, foam-composite sandwich structures for EDM machine tool components such as column and column block designed by controlling stacking sequences and cross-sectional dimensions of the composite structures. The original column block is a box-shaped structure made of aluminum connecting a column and a Z-stage of the system. This research was focused on the design of efficient column block structure using a foam-composite sandwich structure which have good bending stiffness and damping characteristics to reduce the mass and increase damping ratio of the system. Vibration tests for getting damping ratio with respect to the stacking angle and thickness of the composites were carried out. Finite element analyses for static defection and vibration behaviour were also carried out to find out the appropriate stacking conditions; that is, stacking sequence and rib configuration. From the test and analysis results it was found that composite-foam sandwich structures for the microfactory system can be successful alternatives for high precision machining.

Development of polishing tool system for robot (로보트용 금형 연마 공구 시스템의 개발)

  • 박종오;이대엽
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.190-193
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    • 1990
  • Die finishing (polishing and lapping) after NC machining is characterized as one bottleneck process for reducing lead time. For automation of this typical manual work, a flexible polishing tool system using industrial robot has been developed. This tool system has three principal functions in order to achieve reduction of waviness, 3 D.O.F. compliance and constant pressure structure. This polishing tool shows that adaptability to free form surface is increased and programmability to various areas of die surface is also acquired.

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Weight Minimization of a Beam Structure Using a Honeycomb Sandwich Panel (허니컴 샌드위치 패널을 이용한 보 구조물의 경량화에 관한 연구)

  • 성활경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.125-128
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    • 2003
  • In machine tool design, fast traversing cannot be achieved without reducing mass of the moving part. Honeycomb sandwich panel is extremely lightweight, and relatively rigid at the same time. We can reduce much weight when we selectively utilize honeycomb sandwich panels as stiffeners on machine tool structures. Feasibility of reducing weight is studied using a beam structure with both ends fixed.

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Scan Tool-Path Generation for Laser Pattern Machining (레이저 패턴 가공용 스캔 공구경로 생성)

  • Lee, Chang-Ho;Park, Sang-Chul
    • Korean Journal of Computational Design and Engineering
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    • v.16 no.4
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    • pp.300-304
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    • 2011
  • This paper proposes an approach to generate tool-path for laser pattern machining. Considering the mechanical structure of a laser pattern machine, it is quite similar to that of a 2D milling machine. Based on the observation, one may try to utilize the tool-path generation methodologies of 2D milling for the laser pattern machining. However, it is not possible to generate tool-path without considering the technological requirements of laser pattern machining which are different from those of 2D milling. In this paper, we identify the technological requirement of laser pattern machining, and propose a proper tool-path generation methodology to satisfy the technological requirements. For the efficient generation of tool-path, this paper proposes a tool-path element computation method, which is based on the concept of a monotone chain.

Design of a Machine Tool containing a 3-strut Parallel Kinematic Structure (병렬구조 머시닝센터 설계기술)

  • Kim, Tae-Jung;Kim, Suk-Il;Nah, Seung-Pyo;Kim, Ki-Tae
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.8
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    • pp.878-885
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    • 2011
  • A kinematically-hybrid 5-axis machine tool is analyzed from the perspective of machine tool design. Its kinematic characteristics are pointed out, which should be considered during the conceptual design process. A result of the structural analysis of the machine is presented, which is performed during the detailed design process. It is also presented how we improve the thermal characteristics of the machine tool by changing the installation position of the actuators.