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시험장비의 특성을 고려한 진동시험결과에 대한 측정불확도 추정
문석준(Seok-Jun Moon),정정훈(Jung-Hoon Chung) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.7
All measurements are subject to uncertainty and a measurement result is complete only when it is accompanied by a statement of the associated uncertainty. By international agreement, this uncertainty has a probabilistic basis and reflects incomplete knowledge of the quantity value. The “Guide to the Expression of Uncertainty in Measurement”, commonly known as the GUM, is the definitive document on this subject. The requirements for estimation of measurement uncertainty apply to all results provided by calibration laboratories and results produced by testing laboratories under the optional circumstances. In this paper, a procedure for estimation of measurement uncertainty from vibration testing is proposed on KS F 2868:2003 as an example. Both Type A and Type B evaluation of uncertainty are considered to calculate the combined standard uncertainty and expanded uncertainty.
김길원(Kilwon Kim),이정기(Jeongki Lee),고태경(Taekyeoung Ko),최종수(Jongsu Choi) 한국해양환경·에너지학회 2021 한국해양환경공학회 학술대회논문집 Vol.2021 No.10
본 연구에서는 성능시험에 있어 반드시 선행되어야 한 측정불확도에 대한 내용을 다룬다. 측정불확도의 국제표준 및 국내표준(KS Q ISO/IEC 17025)의 내용을 리뷰하고, 일반적인 측정불확도 추정 절차에 대하여 설명한다. 측정불확도 추정 절차에 따른 분석 사례를 소개하고 교정성적서의 예시를 설명한다. 마지막으로 IEC/TS 62600-100에서 제안하는 방법을 적용하여 파력발전장치 실해역 계측 데이터를 바탕으로 수행한 성능평가 내용을 소개하고, 향후 측정불확도를 포함한 파력발전 성능시험 성적서 작성을 위한 측정불확도 요소를 분석하여 소개하고자 한다. This study deals with the measurement in uncertainty, which must be preceded in the performance test. The international and domestic standards documents of measurement in uncertainty (KS Q ISO/IEC 17025) are reviewed, and the general procedure for estimating measurement in uncertainty is explained. An example of analysis according to the measurement in uncertainty estimation procedure is introduced and an example of a calibration certificate is explained. By applying the method proposed in IEC/TS 62600-100, the performance assesment performed based on the real sea measurement data of the wave power plant is introduced. Lastly, by applying the method proposed in IEC/TS 62600-100, the performance evaluation performed based on the real sea test measurement data of the wave power plant is introduced, and analysis of measurement in uncertainty factors for the preparation of the wave power performance test certificate including the measurement in uncertainty in the future are introduced.
표준 영상에 의한 FFT 기반 상호상관 PIV 알고리즘의 불확도 해석
이석종(Sukjong Lee),최중근(Junggeun Choi),성재용(Jaeyoung Sung),황태규(Tae Gyu Hwang),도덕희(Deog Hee Doh) 한국가시화정보학회 2005 한국가시화정보학회지 Vol.3 No.2
Uncertainty introduced by a cross-correlation algorithm based on FFT has been investigated using PIV standard images. The standard images were generated by the Monte Carlo simulation method. Both bias and random errors from the velocity vector have been analyzed with regard to the particle diameter, displacement, and the number of particles. The uncertainty of velocity is evaluated based upon the ISO/IEC standard. As a result, a total error of 0.26% is included in the PIV cross-correlation algorithm. In addition, the uncertainty budget is presented, where the effect of the above three variables is examined. According to the budget, the variation of the number of particles within the interrogation window mainly contributes to the combined standard uncertainty of the real measured velocity field when excluding the effect of errors by the experiments itself. Finally, the expanded uncertainty is found to be about 12% at the 95% confidence level.
박태국(Tae-Kook Park),최병오(Byung-Oh Choi),송태진(Tae-Jin Song),장영규(Young-Gyu Chang),양청광(Cheong-Kwang Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Temperature (high, low, cycle, change) and humidity test has been performed in the basic test of environmental testing. And temperature and humidity test is performed in the temperature and humidity environmental chamber. The reliability has recently been important in the industry. Environmental testing is a branch of the reliability test. So temperature and humidity test has been extensively increased in the industry. In this paper, Temperature in the temperature and humidity environmental chamber is measured during temperature test. The uncertainty of the measured temperature is calculated. So the estimation of uncertainty of the measured temperature is described. The expanded uncertainty (ĸ = 2) of the temperature test is 0.32 ℃
김갑순(Gab-Soon Kim),신희준(Hyi-Jun Shin),김현민(Hyeon-Min Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper describes the development of multi-axis force/moment sensor calibration system and its uncertainty evaluation. This sensor, which has maximum capacities of 2000N in forces and 400Nm in moments, can generate the continuous forces (±Fx, ±Fy and ±Fz) and moments (±Mx, ±My and ±Mz.). In order to be used multi-axis force/moment sensors in many kinds of industries, they are carried out the characteristic test or the calibration with the system that can generate the forces and the moments. The developed calibrating systems are the disadvantages of the low capacity, the generation of step force and moment with weights, the high coasts in manufacture and so on. In this paper, the multi-axis force/moment sensor calibration system that can generate the continuous forces and moments was developed. Its maximum capacities are 2000N in forces and 400Nm in moments. And the system was evaluated in the expanded relative uncertainty. They were ±0.0004 in forces ±Fx , ±Fy, ±Fz, and ±0.0004 in moments ±Mx, ±My, ±Mz.
문석준(Seok-Jun Moon),권정일(Jung-Il Kwon),박진우(Jin-Woo Park),정정훈(Jung-Hoon Chung),황을하(Eul-Ha Hwang) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.7
An underwater shock test on the naval ship can be performed to investigate the overall shock performance for launched ships equipped with all of the equipment at sea. In general, in an underwater shock test, the input to the naval ship is the shock pressure generated by the explosive, and output is the structural responses of the ship, such as acceleration, velocity, displacement, etc. It is therefore very important to accurately measure the shock pressure level produced by the explosives. In this study, we propose a method to examine the validation, verification and accreditation for maximum shock pressure data measured from an underwater shock test. To do this, we estimate the measurement uncertainty of the measurement data and compare the results using an empirical formula.