• Title/Summary/Keyword: Scanning Path

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A Study on Generation of Laser Scanning Path and Scanning Control (레이저 주사 경로 생성 및 주사 제어에 관한 연구)

  • 최경현;최재원;김대현;도양회;이석희;김성종;김동수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1295-1298
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    • 2004
  • Selective Laser Sintering(SLS) method is one of Rapid Prototyping(RP) technologies. It is used to fabricate desirable part to sinter powder and stack the fabricated layer. To develop this SLS machine, it needs effective scanning path and the development of scanning device. This paper shows how to make fast scanning path with respect to scan spacing, laser beam size and scanning direction from 2-dimensional sliced file generated in commercial CAD/CAM software. Also, we develop the scanning device and its control algorithm to precisely follow the generated scanning path. Scanning path affects precision and total machining time of the final fabricated part. Sintering occurs using infrared laser which has high thermal energy. As a result, shrinkage and curling of the fabricated part occurs according to thermal distribution. Therefore, fast scanning path generation is needed to eliminate the factors of quality deterioration. It highly affects machining efficiency and prevents shrinkage and curling by relatively lessening the thermal distribution of the surface of sintering layer. To generate this fast scanning path, adaptive path generation is needed with respect to the shape of each layer, and not simply x, y scanning, but the scanning of arbitrary direction must be enabled. This paper addresses path generation method to focus on fast scanning, and development of scanning system and control algorithm to precisely follow generated path.

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A Path Generation Algorithm of an Automatic Guided Vehicle Using Sensor Scanning Method

  • Park, Tong-Jin;Ahn, Jung-Woo;Han, Chang-Soo
    • Journal of Mechanical Science and Technology
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    • v.16 no.2
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    • pp.137-146
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    • 2002
  • In this paper, a path generation algorithm that uses sensor scannings is described. A scanning algorithm for recognizing the ambient environment of the Automatic Guided Vehicle (AGV) that uses the information from the sensor platform is proposed. An algorithm for computing the real path and obstacle length is developed by using a scanning method that controls rotating of the sensors on the platform. The AGV can recognize the given path by adopting this algorithm. As the AGV with two-wheel drive constitute a nonholonomic system, a linearized kinematic model is applied to the AGV motor control. An optimal controller is designed for tracking the reference path which is generated by recognizing the path pattern. Based on experimental results, the proposed algorithm that uses scanning with a sensor platform employing only a small number of sensors and a low cost controller for the AGV is shown to be adequate for path generation.

A Path Navigation Algorithm for an Autonomous Robot Vehicle by Sensor Scanning (센서 스캐닝에 의한 자율주행로봇의 경로주행 알고리즘)

  • Park, Dong-Jin;An, Jeong-U;Han, Chang-Su
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.8
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    • pp.147-154
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    • 2002
  • In this paper, a path navigation algorithm through use of a sensor platform is proposed. The sensor platform is composed of two electric motors which make panning and tilting motions. An algorithm for computing a real path and an obstacle length is developed by using a scanning method that controls rotation of the sensors on the platform. An Autonomous Robot Vehicle(ARV) can perceive the given path by adapting this algorithm. A sensor scanning method is applied to the sensor platform for using small numbers of sensor. The path navigation algorithm is composed of two parts. One is to perceive a path pattern, the other is used to avoid an obstacle. An optimal controller is designed for tracking the reference path which is generated by perceiving the path pattern. The ARV is operated using the optimal controller and the path navigation algorithm. Based on the results of actual experiments, this algorithm for an ARV proved sufficient for path navigation by small number of sensors and for a low cost controller by using the sensor platform with a scanning method.

Laser Scanning Path Generation for the Fabrication of Large Size Shape

  • Choi, Kyung-Hyun;Choi, Jae-Won;Doh, Yang-Hoe;Kim, Dong-Soo
    • 제어로봇시스템학회:학술대회논문집
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    • pp.2175-2178
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    • 2005
  • Selective Laser Sintering(SLS) method is one of Rapid Prototyping(RP) technologies. It has been used to fabricate desirable part to sinter powder and stack the fabricated layer. Since the sintering process occurs using infrared laser having high thermal energy, shrinkage and curling of the fabricated part occurs according to thermal distribution. Therefore, the fast scanning path generation is necessary to eliminate the factors of quality deterioration. In case of fabricating larger size parts, the unique scanning device and scanning path generation should be considered. In this paper, the development of SLS machines being capable of large size fabrication(800${\times}$1000${\times}$800 mm, W${\times}$D${\times}$H) will be addressed. The dual laser system and the unique scanning device have been designed and built, which employ CO2 lasers and dynamic 3-axis scanners. The developed system allows scanning a larger planar surface with the desired laser spot size. Also, to generate the fast scanning paths, adaptive path generation is needed with respect to the shape of each layer, and not simply x, y scanning, but the scanning of arbitrary direction should be enabled. To evaluate the suggested method, the complex part will be used for the experiment fabrication.

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The Study on Reduction of Scanning Path Build Time According to Control of STL file Slicing Height - Application of Small Jewellery (STL File 슬라이싱 높이 조정에 따른 주사경로 생성시간 저감에 관한 연구 - 소형 보석류에 적용)

  • Kim Tae Ho;Kim Min Ju;Lee Seung Soo;Jeon Eon Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.12
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    • pp.205-210
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    • 2005
  • This paper addresses the correlation between the change of file size and the scanning path build time by the slicing height of STL file. Though the study about STL file has been achieved quite actively scanning path build time using STL file is not investigated so much to be satisfied. The file size depends on the number of polygon created by the slicing height specified. And this number of polygons increases in a regular rate. The correlation between the number of polygons and the scanning path build time is examined and verified.

The study on the reducing of scanning path creation time using SLC file. (SLC파일을 이용한 주사경로 생성 시간 단축에 관한 연구)

  • 김태호;장성규;박정보;이준희;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.114-118
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    • 2004
  • This paper is compared the build time of scanning path as to laminate height of the SLC and STL file. The STL file improve the surface roughness according to slicing height. But it have the fault spending long time to the creation of scanning path by being lower slicing height. So we proposed the SLC file to improve this fault. Therefore this paper showed to the build time of scanning path by the increase of peace using the jewellery model.

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Study on the Laser Scanning Path Creation Time of Rapid prototype Using Jewellery Data (쥬얼리 데이터를 이용한 쾌속조형장치의 주사경로 생성 시간에 관한 연구)

  • 한민식;김태호;김민주;이준희;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.190-193
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    • 2004
  • This paper presents studies on the creation time of scanning path using rapid prototype device. In the case of Jewellery, it needs to take time too much at the whole process of rapid prototype in accordance with heigh of the multi-layered. When increases the number of polygon by heigh of the Multi-layered, it has proper influence on the creation time of scanning path. Therefore, we can get the spending time and the number of polygon for the creation during increase the heigh of the multi-layered. These values are showed by the quantitative. We try to analyze relation between these and heigh of the multi-layered.

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Analysis of Features to Acquire Observation Information by Sex through Scanning Path Tracing - With the Object of Space in Cafe - (주사경로 추적을 통한 성별 주시정보 획득특성 - 카페 공간을 대상으로 -)

  • Choi, Gae-Young
    • Korean Institute of Interior Design Journal
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    • v.23 no.5
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    • pp.76-85
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    • 2014
  • When conscious and unconscious exploring information of space-visitors which is contained in the information acquired in the process of seeing any space is analyzed, it can be found what those visitors pick up as factors in the space for its selection as visual information in order to put it into action. This study, with the object of the space reproduced in three dimensions from the cafe which was visited for conversation, has analyzed the process of acquiring space-information by sex to find out the features of scanning path, findings of which are the followings. First, the rate of scanning type of males was "Combination (50.5%)- Circulation (31.0%) and that of females "Horizontal (32.5%) - Combination (32.1%)", which shows that there was a big difference by sex in the scanning path which took place in the process of observing any space. Second, when the features of continuous observation frequency by sex is looked into, the trends of increased "horizontal" scanning and decreased "Combination" scanning of both showed the same as the frequency of continuous observations increased, while in case of "Circulation" scanning, that of females was found to decrease but that of males showed the aspect of confusion. Third, the 'Combination' scanning of males was found strong at the short observation time with three times of continuous observation frequency defined as "Attention Concentration" while the distinct feature was seen that the scanning type was dispersed to "combination-circulation" as the frequency of continuous observation increased. Females start the information acquirement with "combination-circulation" but in the process of visual appreciation they showed a strong "Horizontal" These scanning features can be defined as those by sex for acquiring space information and therefore are very significant because they are fundamental studies which will enable any customized space-design by sex.

Analysis of Frequency Response of Piezo Stages and Scanning Path Monitoring/Compensation for Scanning Laser Optical Tweezers (주사 레이저 광집게를 위한 압전 구동기 주파수 특성 분석과 주사 경로 추적 및 보상)

  • Hwang, Sun-Uk;Lee, Song-Woo;Lee, Yong-Gu
    • Korean Journal of Optics and Photonics
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    • v.19 no.2
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    • pp.132-139
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    • 2008
  • In scanning laser optical tweezers, high speed scanning stages are used to manipulate a laser beam spot. Due to the inertia of the stage, the output scanning signal decreases with increased frequency of the input signal. This discrepancy in the signals is difficult to observe since most of the energy from the laser beam is blocked out to avoid CCD damage. In this paper, we propose two methods to alleviate these problems. Firstly, frequency responses of piezo stages are measured to analyze the signal drops and the input signal is compensated accordingly. Secondly, an overlay of the scanning path is drawn on the live monitoring screen to enhance the visibility of the scanning path. The result is a drop-compensated scanning with clear path view.

The Study on the Reduction of Laser Scanning Path Creation Time during Jewellery Pattern Manufacturing (쥬얼리 패턴제작시 주사경로생성시간 단축에 관한 연구)

  • Kim, T.H.;Kim, S.Y.;Park, J.D.;Kim, M.J.;Jeon, E.C.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.440-446
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    • 2006
  • This study relates to the effect of forming time of injection path on the total process. The whole process can be divided into build process of forming path of injection and after treatment process. The total time required for the whole process could be reduced by reducing the forming time of injection path using SLC file to correct the problems of STL file that is the basic file format for high speed molding devices. First of all, I verify the forming time of injection path according to the conditions of STL file during the formation of injection path. And I verify problems using STL file during formation of injection path. And then I tried to solve problems of STL file by comparing between the formation time of injection path and the existing method using SLC files.