• Title, Summary, Keyword: Measurement System

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ZOOMING FUNCTIONAL METHOD FOR POSITION MEASUREMENT IN ENCLOSING SIGNAL FIELD BASED N CONCEPT OF PROGRESSIVE LEARNING MEASUREMENT SYSTEM

  • Ohyama, Shinji;Cao, Li;Kobayashi, Akira
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1318-1321
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    • 1997
  • A method for two-dimensional position measurement using an enclosing field has been studied and reported. The feature of this mehtod is zooming functional measurement by operating both the initial phase shift and the brightness ratio of the lighting function. An experimental system was developed and the experimental results on zooming effects are shown in this paper. This system is also an example of a "progressive learning measurement system".tem".uot;.

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A Study on Measurement Accuracy of A Theodolite System(V) - A Measurement System Accuracy depending on the distance from theodolite system to target Bars (데오드라이트 시스템의 측정 정확도에 대한 연구(V) - 타켓 바의 거리에 따른 측정 정확도)

  • Yoon Yong-Sik;Lee Dong-Ju
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.4
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    • pp.13-21
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    • 2005
  • The affected factors for an accuracy of theodolite system are not only the measurement environment of temperature, illumination, etc. but also the measurement processes of the distance between two theodolites, the distance from theodolite system to scale bar and the distance from theodolite system to targets. We have known that the best collimation distance between two theodolites and the best distance from theodolite system to scale bar is $3{\sim}4m$. This study was performed for searching the best distance from theodolite system to targets on above measurement configuration. And, we could know that the best distance from theodolite system to targets is $2{\sim}6m$ and the system accuracy could be within ${\pm}0.025mm$.

Stability Evaluation of In-Line Measurement System with Repeated Measurements (반복 측정이 가능한 인라인 측정시스템의 안정성 평가)

  • Joung, Sooho;Byun, Jai-Hyun
    • Journal of Korean Institute of Industrial Engineers
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    • v.30 no.1
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    • pp.36-43
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    • 2004
  • In-line measurement systems are preferred to those in analytical laboratories, since in-line systems provide rapid response to process upsets. If an in-line measurement system exhibits an unstable variation and if this instability in measurement variation goes undetected, it will make the process monitoring procedure invalid. This paper presents a stability evaluation procedure for the in-line measurement system using two independent readings from the in-line measurement system and one reading from the analytical laboratory, which requires less measurement cost and time.

Calibration and INvestigation into Measurement Performance of a Visual Sensing System (시각측정시스템의 캘리브레이션 및 측정성능 검토)

  • Kim, Jin-Young;Cho, Hyung-Suck
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.8
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    • pp.113-121
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    • 1999
  • It is necessary to calibrate measurement systems to enhance its measurement accuracy. The visual sensing system that is presented in our previous work has to be calibrated, too. It is a multiple mirror system for three-dimensional measurement, which is composed of a camera and a series of mirrors. It is important to calibrate the positions and orientations of the mirrors relative to the camera because they have direct influence on the relationship between the image plane and the task space. This paper presents the calibration method for the visual sensing system. To confirm the measurement performance of the implemented system. its measurement accuracy in measuring the locations in three-dimensional space is investigated. A series of experiments for measuring the locations of the circle-shaped marks are performed. Experimental results show that the sensing system can be effectively used for three-dimensional measurement.

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A Study on Measurement Accuracy of Theodolite System( I ) - A Measurement Accuracy According to a Theodolite Collimations Distance (데오도라이트 시스템의 측정 정확도에 대한 연구( I ) - 데오도라이트 시준 거리에 따른 측정 정확도)

  • 윤용식;이동주
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.2
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    • pp.61-68
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    • 2004
  • A non-contact precision measurement system is a theodolite system, a laser tacker and a photogrammetry system etc. Nowadays, the system reaches to a limit of measurement accuracy required from industrial product of middle and large scale. The one of the solutions for this problem is to maximize the accuracy of the existing measurement system. According to it we performed the study far a measurement accuracy of theodolite system when the distance between two theodolites is changed 1m to 5m. We could blow that the changes of distance affect the measurement accuracy of theodolite system and that the maximum measurement accuracy is $\pm$ 0.02 mm on theodolite distance 3∼4 m.

A Study on The Measurement System of Acceleration Data To Estimate Operating KTX High Speed Train (KTX 주행안정성 평가를 위한 진동가속도 계측데이터의 신호처리에 관한 연구)

  • Kang, Tae-Won;Kim, Yu-Seung
    • Proceedings of the KSR Conference
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    • pp.1020-1023
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    • 2009
  • A purpose of this study measure the acceleration of operating KTX high speed train to find out something wrong to obtain reliable the acceleration measurement data. The existing measurement system come about a difference between measurement data of running off the track with the acceleration measurement data of operating KTX high speed train. Therefore, the measurement system needs make up for the weak points in the current system. This study analyze existing measurement system and the acceleration measurement data to introduce the synchronization of the existing measurement system and the acceleration measurement and will be reasonable to this sampling through field test.

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Estimations of Measurement System Variability and PTR under Non-normal Measurement Error (비정규 측정오차의 경우 측정시스템 변동과 PTR 추정)

  • Chang, Mu-Seong;Kim, Sang-Boo
    • Journal of the Korean Society for Quality Management
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    • v.35 no.1
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    • pp.10-19
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    • 2007
  • ANOVA is widely, used for measurement system analysis. It assumes that the measurement error is normally distributed, which nay not be seen in some industrial cases. In this study the estimates of the measurement system variability and PTR (precision-to-tolerance ratio) are obtained by using weighted standard deviation for the case where the measurement error is non-normally distributed. The Standard Bootstrap method is used foy estimating confidence intervals of measurement system variability and PTR. The point and confidence interval estimates for the cases with normally distributed measurement error are compared to those with non-normally distributed measurement errors through computer simulation.

Evaluation Method for Measurement System and Process Capability Using Gage R&R and Performance Indices (게이지 R&R과 성능지수를 이용한 측정시스템과 공정능력 평가 방법)

  • Ju, Youngdon;Lee, Dongju
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.42 no.2
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    • pp.78-85
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    • 2019
  • High variance observed in the measurement system can cause high process variation that can affect process capability badly. Therefore, measurement system analysis is closely related to process capability analysis. Generally, the evaluation for measurement system and process variance is performed separately in the industry. That is, the measurement system analysis is implemented before process monitoring, process capability and process performance analysis even though these analyses are closely related. This paper presents the effective concurrent evaluation procedure for measurement system analysis and process capability analysis using the table that contains Process Performance (Pp), Gage Repeatability & Reproducibility (%R&R) and Number of Distinct Categories (NDC). Furthermore, the long-term process capability index (Pp), which takes into account both gage variance and process variance, is used instead of the short-term process capability (Cp) considering only process variance. The long-term capability index can reflect well the relationship between the measurement system and process capability. The quality measurement and improvement guidelines by region scale are also described in detail. In conclusion, this research proposes the procedure that can execute the measurement system analysis and process capability analysis at the same time. The proposed procedure can contribute to reduction of the measurement staff's effort and to improvement of accurate evaluation.

Realization of High Precision Position Measurement System Using M-sequence Encoded Laser Beam Scanning

  • Takayama, Jun-ya;Shinji Ohyama;Akira Kobayashi
    • 제어로봇시스템학회:학술대회논문집
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    • pp.107.5-107
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    • 2001
  • In this report, as the active position measurement system, a new method for two-dimensional position measurement system using a concept of semi-open type signal field has proposed. The feature of this system is realizing a position measurement only by scanning the encoded laser beams from scanning points to a measurement field, and observed it. First, both system configuration and encoding method are considered concretely, and M-sequence signal is selected for encoding. Next system design is performed to realize the theoretical measurement accuracy, and applied to a position measurement experiments. Experimental results show that measurement precision is larger than theoretical values. Furthermore, method for improving the measurement ...

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Two-Dimensional Assessment for Measurement System Analysis (측정시스템 분석을 위한 2차원 척도 평가)

  • Seo, Sun-Keun
    • Journal of the Korean Society for Quality Management
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    • v.42 no.4
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    • pp.607-616
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    • 2014
  • Purpose: This paper reviews popular measurement system indices and proposes a procedure for assessing a measurement system using two parameters with intraclass correlation and a factor for process capability. Methods: Gage Repeatability and Reproducibility(GR&R), precision-to-tolerance ratio(PTR), number of distinct categories, producer's and consumer's risks are employed to assess the measurement capabilities and discuss the relationships between measurement system metrics. Results: Two-dimensional plot by two parameters is presented to assess adequacy of the measurement system and process capability. A numerical example and previously studied case study are provided for illustration. Conclusion: The procedure proposed in this paper using two-dimension parameters provides a valuable procedure and helpful guidelines to quality and production managers in assessing the capabilities of a measurement system and choosing the needed actions to be the most benefit.