• Title/Summary/Keyword: measurement systems

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Explosion Shock Measurement System of the Precursor Warhead for the Tandem Projectile (탠덤 비행체의 선구탄두 기폭 충격 측정 시스템 구현)

  • Choi, Donghyuk;An, Jiyeon;Kim, Yubeom;Son, Joongtak;Lee, Ukjun;Park, Hyunsoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.5
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    • pp.503-510
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    • 2021
  • This paper presents a system that measures the acceleration of the shock caused by the explosion of the precursor warhead for the tandem projectile. The proposed system, which is implemented based on the MIL-STD-810G, Method 517.1, consists of a miniaturized shock measurement device, a cable, accelerometers, and a trigger circuit. The shock measurement device has a size of ¢102 × 171 mm and cable has a length of 3 m. The operational confirmation test is conducted by implementing the measurement system. The Analysis of shock data(accelerometer output data) is carried out using Shock Response Spectrum(SRS), pseudo velocity and plot of acceleration time transient. Through measurement analysis, one can predict the damage of electronics in projectile when precursor warhead is exploded.

On the measurement of the transient dynamics of the nanocomposites reinforced concrete systems as the main part of bridge construction

  • Shuzhen Chen;Hou Chang-ze;Gongxing Yan;M. Atif
    • Structural Engineering and Mechanics
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    • v.90 no.4
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    • pp.417-428
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    • 2024
  • Nanocomposite-reinforced concrete systems have gained increasing attention in bridge construction due to their enhanced mechanical properties and durability. Understanding the transient dynamics of these advanced materials is crucial for ensuring the structural integrity and performance of bridge infrastructure under dynamic loading conditions. This paper presents a comprehensive study of the measurement techniques employed for assessing the transient dynamics of nanocompositereinforced concrete systems in bridge construction applications. A numerical method, including modal analysis are discussed in detail, highlighting their advantages, limitations, and applications. Additionally, recent advancements in sensor technologies, data acquisition systems, and signal processing techniques for capturing and analyzing transient responses are explored. The paper also addresses challenges and opportunities in the measurement of transient dynamics, such as the characterization of nanocomposite-reinforced concrete materials, the development of accurate numerical models, and the integration of advanced sensing technologies into bridge monitoring systems. Through a critical review of existing literature and case studies, this paper aims to provide insights into best practices and future directions for the measurement of transient dynamics in nanocompositereinforced concrete systems, ultimately contributing to the design, construction, and maintenance of resilient and sustainable bridge infrastructure.

A Statistical Software for Measurement Systems Analysis (측정시스템 분석용 통계소프트웨어의 개발)

  • 이승훈;이종환
    • Journal of Korean Society for Quality Management
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    • v.28 no.1
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    • pp.175-195
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    • 2000
  • In this study, we developed a statistical software for measurement systems analysis. This software is patterned after the Measurement Systems Analysis Reference Manual developed by the Automotive Industry Action Group (AIAG). This software includes stability analysis, bias and linearity analysis, and gage R&R studies. This software was developed by using Delphi(version 4.0) and can be implemented on MS Windows 95 or higher level.

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Interconnected AC/DC System (문직운전계통을 포함한 전럭계통에서의 상태주정에 관한 연구)

  • 김준현;박건수;이종범
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.1
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    • pp.1-9
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    • 1988
  • This paper descibes a method for the state estimation in power systems with interconnected AC/DC system. The state values in interconnected AC/DC system are estimated using measurement values with the pseudo measurement so that the number of telemetering measurement can be reduced. Especially, the state values in AC system are estimated through hierarchical method after system decomposition including superposition bus was formed for the state estimation in large-scale power systems. The results of the application to the two model power systems show the dffectiveness of the presented algorithms.

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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
    • Proceedings of the Korean Society for Quality Management Conference
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    • 2006.11a
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    • pp.199-204
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    • 2006
  • ANOVA is widely used for measurement system analysis. It assumes that the measurement error is normally distributed, which may 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 for 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.

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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.

A Study on an Equipment Performance Measurement System for Effective Bottleneck Management (병목 설비의 개선 활동에 유용한 설비관리 지표체계에 관한 연구)

  • Lee, Min-Ho;Lim, Sung-Mook
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.33 no.4
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    • pp.100-113
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    • 2010
  • Manufacturing companies' cost competitiveness with respect to equipment management can be achieved by satisfying additional market demands by their own capacity without purchasing additional equipments. In essence, it can be accomplished by making continuous investigation into bottlenecks and improvement on them. Therefore, equipment performance measure systems should be designed so that they can support manufacturing companies' such endeavors. With the purpose of establishing an effective equipment performance measurement system for detecting and improving bottlenecks, this study (1) suggests some desirable features that such a system should have, (2) evaluates conventional equipment performance measurement systems in terms of their usefulness for the detection and improvement of bottlenecks, and (3) proposes an improved system. We also perform a simulation experiment to demonstrate the limitations of the conventional systems and show how the proposed system can resolve the problems.

Process capability index for single process with multiple measurement locations (다수 측정 위치를 갖는 단일 공정의 공정능력지수)

  • Lee, Do-Kyung;Lee, Hyun-Seok
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.30 no.3
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    • pp.28-36
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    • 2007
  • Process Capability indices (PCIs) have been widely used in manufacturing industries to provide a quantitative measure of process performance. PCIs have been developed to represent process capability more exactly. In the previous studies, only one designated location on each part is measured. But even though in single process, multiple measurement locations on each part are required to calculate the reliable process capability. In this paper, we propose a new process capability index with multiple measurement locations on each part. We showed numerical examples and sensitivity analysis according to the number of measurement locations.

Design of Range Measurement Systems Using Ultrasound and Camera Focusing (초음파와 카메라의 초점화를 이용한 거리계측 시스템 설계)

  • Moon, Chang-Soo;Do, Yong-Tae
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.595-597
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    • 2004
  • In this paper range measurement systems using ultrasonic and visual sensors are designed. By varying the focus of a camera, the range to a target pattern is computed. Pour different methods are tested for the focusing-based range measurement. The best result is obtained when counting edge pixels found by Laplacian operator. Higher accuracy can be obtained by fusing the measurement of camera focusing with that of ultrasonic sensor. The system designed is experimented within the range of 300-450mm.

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A Study on Technical Measures and their Application (기술척도 적용 연구)

  • Choi, Seok
    • Journal of the Korean Society of Systems Engineering
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    • v.3 no.2
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    • pp.3-8
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    • 2007
  • Technical Measures includes Measures of Effectiveness(MOEs), Key Performance Parameters(KPPs), Measures of Performance(MOPs) and/or Technical Performance Measures(TPMs). Technical measurement is the set of measurement activities used to provide supplier and/ or acquirer insight into progress in the definition and development of the technical solution, ongoing assessment of the associated risks and issues. This paper describes how technical measures can be applied, using the measurement process described in the previous study and shows the relationship between the various types of technical measures.

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