Ranking and Evaluation of Suppliers using AHP and TOPSIS in Calibration Laboratory

Author(s):  
Karan Shah ◽  
Khanak Ichhuda ◽  
Sunny Prajapati ◽  
Abhishek Kumar
1991 ◽  
Vol 113 (2) ◽  
pp. 228-232 ◽  
Author(s):  
J. W. Murdock ◽  
D. R. Keyser

Equations for the extrapolation of calibration data for ASME/PTC 6 throat tap nozzles are derived from boundary layer theory. The results match published coefficients with a maximum difference of +0.03 percent. It is also shown that the effects of transition in the boundary layer extend to throat Reynolds numbers in excess of 10,000,000, far beyond the capacity of any known calibration laboratory. The present PTC 6 requirement that calibration data must be in the fully turbulent range cannot be met with current facilities.


2021 ◽  
Vol 13 (2) ◽  
pp. 23-35
Author(s):  
Hau Wah Lai ◽  
Cho Man Tsui

This paper presents a t wo-dimensional 10 x 10 LED array system developed in-house at t he Standards and Calibration Laboratory (SCL) for the calibration of timing parameters of still image cameras and video cameras. In this paper, the circuit design and the calibration methods for cameras of different shutter types (rolling shutter or global shutter) are presented. This LED array may also be used to verify the shutter type of cameras. The frequency of the clock signal applied in the calibration is traceable to the SI through the cesium beam frequency standard maintained at SCL.


2016 ◽  
Vol 853 ◽  
pp. 216-220 ◽  
Author(s):  
You Gang Peng ◽  
Yong Wang

Experiments were carried out to investigate the effect of arm length on the accuracy of two typical conventional torque wrenches, namely, setting type torque wrench (STW) and indicating type torque wrench (ITW). The experiment results demonstrate that the measurement values of STW rises rapidly with decreasing arm length while measured torque of ITW shows irrelevant to arm length. Theoretical solution with respect to STW shows quite good agreement with experiment results. Irrelevance of arm length regard to ITW may be attributable to compensation of bending moment measurement due to proper arrangement of circuit and structural design. In order to conduct a proper assessment at a calibration laboratory or ensure its reliability with reference to actual use conditions, a torque wrench should be used by a customer at the loading point as recommended.


2020 ◽  
Vol 167 ◽  
pp. 108219
Author(s):  
Tallyson S. Alvarenga ◽  
Ivon O. Polo ◽  
Walsan W. Pereira ◽  
Felipe S. Silva ◽  
Evaldo S. Fonseca ◽  
...  

2018 ◽  
Vol 35 (11) ◽  
pp. 2189-2200 ◽  
Author(s):  
Martha Shulski ◽  
Stonie Cooper ◽  
Glen Roebke ◽  
Al Dutcher

AbstractThe Nebraska Mesonet was established in 1981 as one of the nation’s first automated state weather networks. “Automated” is defined by the nature of the observations being made and recorded by machine, as opposed to observations made and recorded manually. At the time of inception, the five observing locations were geared toward servicing agricultural production applications. The Nebraska Mesonet has grown to 69 stations (as of 2018) and is now a multipurpose environmental observing network under the Nebraska State Climate Office (NSCO). The network is composed of environmental observation stations, sited using best practices for mesoscale and microscale environment situations. Precise observations are acquired using high-quality instrumentation, following manufacturer recommendations for calibrations and maintenance. Calibrations are performed in the NSCO calibration laboratory. Uses for the data include but are not limited to water management, drought monitoring, energy production, health, environmental research, animal management, and crop pest management. This paper provides a technical overview and history of the network, outlining current practices for station siting, maintenance, data quality assurance, and data utility.


2010 ◽  
Vol 44-47 ◽  
pp. 946-950
Author(s):  
Wei Bin Wu ◽  
Tian Sheng Hong ◽  
Jin Xing Guo ◽  
Xian Mao Liu ◽  
Xie Ming Guo ◽  
...  

Air-Fuel Radio (AFR) analyzer technology is basically mastered by monopolies of developed country nowadays. Due to the lack of development in China, it has a strong practical value to study the accurate, rapid response and portable air-fuel ratio analyzer. This article is based on the AFR calculation model microcomputer hardware and software system design, background monitoring software design and debugging and measurement system, and on the choice of universal oxygen sensor calibration laboratory, establishing a wide-range of oxygen sensor output voltage and AFR model. The main features of AFR analyzer are measurement and display of air-fuel ratio, excess air coefficient or oxygen content, via RS232 communication with host computer or via Control Area Network (CAN) bus and vehicle ECU communication function. Test results showed that the error can be controlled at ± 0.03 λ range when comparing the Analyzer measurement values to calculated values. Compared with American Innovate company LM-2 air-fuel ratio analyser, the maximum relative error measured is ±0.08 when exhaust flood or too dilute, the average measurement error is ±0.04 while λ is between 0.8 and 1.3.


2005 ◽  
Vol 44 (30) ◽  
pp. 6426 ◽  
Author(s):  
Steven W. Brown ◽  
B. Carol Johnson ◽  
Stuart F. Biggar ◽  
Edward F. Zalewski ◽  
John Cooper ◽  
...  

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