• Title/Summary/Keyword: measurement set

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Load test of wheel-set for derailment coefficient measurement that have plane style wheel plate (평면형 차륜 형상을 가진 탈선계수 측정용 윤축의 하중시험)

  • Ham Young-Sam;Hong Jai-Sung
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.228-233
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    • 2004
  • A derailment coefficient of railway vehicle is as one of important element that estimate running safety. Derailment coefficient is ratio of lateral load/vertical load happens in contact point between wheel and rail. Lateral load increases, dangerous of derailment can rise. There are ground and vehicle to measurement method of these derailment coefficient. Method of ground is simple, but when vehicles passes data of a point, there is shortcoming that acquire locally. Curved surface style wheel shape that use so far among vehicle method in this research wishes to be not but describe about static load test of wheel-set for derailment coefficient measurement that have plane plate shape that manufacture separate way and correction result etc. to test.

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Wire and Wireless Transmitting-Receiving Set for Vertical Angle and Depth Measurement of Deep Mixing Method (유무선송수신을 이용한 심층혼합처리공법 수직도 및 심도 자동측정에 관한 연구)

  • Han, Woo-Sun;Yu, Chan;Han, Man-Bok
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.10a
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    • pp.629-634
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    • 2002
  • Demands for the automatic measurement on angle and depth of equipment were arisen for the better construction in deep mixing method and grouting method. Civil, geotechnical, electronic, and communication experts worked together for the development of automatic measuring devices using wire and wireless transmitting-receiving set. The results on the development of automatic devices in an industrial installation will be presented.

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Comparison of Ground Resistance Measurement Value by the Substitute Auxiliary Electrode (대체 보조전극을 이용한 접지저항 측정값 비교)

  • Lee, Snag-Ick;Yoo, Jae-Geun;Jeon, Jeong-Chay;Jeon, Hyun-Jae
    • Proceedings of the KIEE Conference
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    • 2007.04b
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    • pp.85-87
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    • 2007
  • This paper summarize about the auxiliary electrode measured a ground resistance The method to measure a ground resistance is the fall-of-potential method to using an auxiliary electrode. And an auxiliary electrode must be set up on the ground. Today it is so difficult to set up the auxiliary electrode on the ground because of many concrete building and many paved roads. So this paper is regarding of the ground resistance measurement by the substitute auxiliary electrode. It substituted a iron structure around the building, a wire net for auxiliary electrode. This information is confirmed by compared with the measurement value.

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A Study on the Selection of Measurement Point for Automatic Environmental Noise Measurement System (환경소음자동측정망의 측정지점 선정에 관한 연구)

  • Lim, J.S.;Lee, B.C.;Jeong, D.J.;Lee, M.H.;Yang, K.H.;Oh, Y.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.442-445
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    • 2007
  • A noise reduction policy can be more effectively made when automatic environmental noise measurement system is set up. However, the local characteristic of noise pollution requires a lot of measurement points. This study considers that automatic environmental noise measurement system connects with automatic air pollution measurement system and noise map. The measurement points of traffic volume by the National Police Agency and the Ministry of Construction and Transportation are investigated to use at drawing the road traffic noise map. Finally, the effective application method of the environmental noise measurement vehicle is discussed.

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Development of Error Compensation Algorithm for Image based Measurement System (미세부품 영상 측정시 진동에 의한 오차 보상 알고리즘 개발)

  • Pyo Chang Ryul
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.10
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    • pp.102-108
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    • 2004
  • In this paper, we studied a vibration problem that is critical and common to most precision measurement systems. For micro mechanical part measurements, results obtained from the vision-based precision measurement system may contain errors due to the vibration. In order to defeat this generic problem, for the current study, a PC based image processing technique was used first, to assess the effect of the vibration to the precision measurement and second, to develop an in-situ calibration algorithm that automatically compensate the measurement results in real time. We used a set of stereoscopic CCD cameras to acquire the images for the dimensional measurement and the reference measurement. The mapping function was obtained through the in-situ calibration to compensate the measurement results and the statistical analysis for the actual results is provided in the paper. Based on the current statistical study, it is expected to obtain high precision results for the micro measurement systems.

P018 Comparison between Cutoff Probe and Langmuir Probe: Focused on Measurement Technique Error

  • Gwon, Jun-Hyeok;Kim, Dae-Ung;Yu, Sin-Jae;Sin, Yong-Hyeon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.235.1-235.1
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    • 2014
  • Precise measurement of plasma parameters including density and temperature is the most essential part for understanding plasma characteristics. To persue more accurate measurement, it is very important to understand the intrinsic error of the measurement method. In this paper, we performed the plasma measurement with different method; langmuire probe and cutoff probe. Both measurement technology are known to be exactly correlate with etch other. We conducted the four set of same experiments process by diffrent persons to observe the intrinsic error based on measurement tools. As a result, the cutoff probe is relatively reliable then the Langmuir probe. This difference is analyzed to be intrinsic since it cames from the inevitable error such as manufacturing of probe tip. From this study, we sure that it is good decision to choose cutoff probe as repeatable measurement independent with intrinsic human factor.

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A Case Study on the Compatibility Analysis of Measurement Systems in Automobile Body Assembly

  • Lee, Myung-Duk;Lim, Ik-Sung;Sung, Chun-Ja
    • International Journal of Reliability and Applications
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    • v.9 no.1
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    • pp.7-15
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    • 2008
  • The dimensional measurement equipment, such as Coordinate Measurement Machine (CMM), Optical Coordinate Measurement Machine (OCMM), and Checking Fixture (CF), take multiple dimensional measurements for each part in an automobile industry. Measurements are also recorded under different measurement systems to see if the responses differ significantly over these systems. Each measurement system (CMM, OCMM, and CF) will be considered as different treatments. This set-up provides massive amounts of process data which are multivariate in nature. Therefore, the multivariate statistical analysis is required to analyze data that are dependent on each other. This research provides step by step methodology for the evaluation procedure of the compatibility of measurement systems and clarify a systematic analyzation among the different measurement system's compatibility followed by number of case studies for each methodologies provided.

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A Study on the Classification of Brassiere Cups by Breast Volume Measurement Values on Women in their Twenties (20대 여성의 유방 부피 계측치에 따른 브래지어 컵의 분류)

  • Park, Yu-Sin;Kim, Seon-Mi;Kim, Eun-Ran
    • Journal of the Ergonomics Society of Korea
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    • v.23 no.2
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    • pp.93-104
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    • 2004
  • The research subjects of this study were 30 unmarried Korean women from 20 to 29 who had never had an operation on their breast. Measurement method using plaster breast mold was used for measuring their volume of breast. The correlation between their breast volume and the methods to set up brassiere cups with the existing method and with their circumference of breast was analyzed using KendalI's Coefficient. which was to figure out a method which had a bigger correlation with the volume of breast between the method to set up brassiere cups using the existing method and the method using the circumference of breast. The results analyzed showed that the coefficient of correlation between the existing method and the volume of breast was .12 and the significance level was .45. They didn't have any correlation. On the other hand. the coefficient of correlation between the circumference of breast and the volume of breast was .82. which was very high values and the significance level was very high .0001. Therefore. it turned out that it was difficult to set up brassiere cups by using the existing method and it was easier and more reliable to set up the cups by using the circumference of breast.

Daily check device manufacture and efficiency Evaluation for daily Q.A (일일 정도관리를 위한 Daily check device 의 제작 및 효율성 평가)

  • Kim Chan Yong;Je Yeong Wan;Lee Je Hui;Park Heung Deuk
    • 대한방사선치료학회:학술대회논문집
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    • 2005.06a
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    • pp.19-22
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    • 2005
  • Introduction: Daily Q.A is the important step which must be preceded in a radiation treatment. Specially, radiation output measurement and laser alignment, SSD indicator related to a patient set-up recurrence must be confirmed for a reasonable radiation treatment. Daily Q.A proceeds correctness and a prompt way, and needs an objective measurement basis. Manufacture of the device which can facilitate confirmation of output measurement and appliances check at one time was requested. Methods and Materials: Produced the phantom formal daily check device which can confirm a lot of appliances check (output measurement and laser alignment, field size, SSD indicator) with one time of set up at a time, and measurement observed a linear accelerator (4 machine) for four months and evaluated efficiency. Result: We were able to confirm an laser alignment, field size, SSD indicator check at the same time, and out put measurement was possible with the same set up, so daily Q.A time was reduced, and were able to confirm an objective basis about each item measurement. As a result of having measured for four months, output measurement within ${\pm}\;2\%$, and measured laser alignment, field size, SSD indicator in range within ${\pm}\;1mm$. Conclusion: We can enforce output measurement and appliances check conveniently and time was reduced and was able to raise efficiency of business. We were able to bring n cost reduction by substitution expensive commercialized equipment. Further It is necessary to makes a product as strong and slight materials, and improve convenience of use.

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Analysis of Wheel Flange Wear Characteristics for KTX (고속철도 차량용 차륜플랜지 마모특성 분석)

  • 이찬우;강부병
    • Proceedings of the KSR Conference
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    • 2002.10b
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    • pp.787-792
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    • 2002
  • This study presents the wheel wear measurement results of Saemaeul train running on the conventional line. The train set included three different cars which have different shape of wheel profile including KNR and KTX profile currently used in Saemaeul. Train set was operated on Seoul-Pusan line with fixed train set formation for commercial service. Wheel wear measurements were peformed periodically. Here, we describe some results.

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