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Tatsuya Funaki,Tomonori Kato,Kenji Kawashima,Toshiharu Kagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In industry, an unsteady flow rate measurement of gases is becoming important increasingly. Our group has been developed an unsteady flow generator with an isothermal chamber for gases and showed that the calibration of the dynamic characteritics for the tested flow meter was effective. However, not only the measurement of the instantaneous flow rate value but also the evaluation of the time mean value in the unsteady flow becomes important in inustry. And it was difficult to control precisely the time mean value of the generated flow rate using the former unsteady flow generator which we developed. To solve this problem,our group developed an oscillatory gas flow generator with highly preciseinlet flow control system in 2008. In this research, to improve and clarify the precision of the generated flow rate with the oscillatory gas flow generator, we conduct to evaluate the performance of the in let flow rate control system with the sonic nozzle and the high precise pressure regulator. As a result, the highre producible results and stability were shown. Moreover, we perform the experiments and uncertainty analysis and confirm the effective of the suggested method.
Benková,, Miroslava,Makovnik, Stefan,Mickan, Bodo,Arias, Roberto,Chahine, Khaled,Funaki, Tatsuya,Li, Chunhui,Choi, Hae Man,Seredyuk, Denys,Su, Chun-Min,Windenberg, Christophe,Wright, John BUREAU INTERNATIONAL DES POIDS ET MESURES 2014 METROLOGIA -BERLIN- Vol.51 No.-
<P>The comparison CCM.FF-K6.2011 was organized for the purpose of determination of the degree of equivalence of the national standards for low-pressure gas flow measurement over the range (2 to 100) m<SUP>3</SUP>/h. A rotary gas meter was used as a transfer standard. The measurements were provided at prescribed reference conditions. Eleven laboratories from four RMOs participated in this key comparison—EURAMET: PTB, Germany; SMU, Slovakia; LNE-LADG, France; SIM: NIST, USA; CENAM, Mexico; APMP: NMIJ AIST Japan; KRISS, Korea; NMI, Australia; NIM, China; CMS, Chinese Taipei; COOMET: GP GP Ivano-Frankivs'kstandart-metrologia, Ukraine and all participants reported independent traceability chains to the SI. All results were used in the determination of the key comparison reference value (KCRV) and the uncertainty of the KCRV. The reference value was determined at each flow separately following procedure A presented by M G Cox. The degree of equivalence with the KCRV was also calculated for each flow and laboratory. All reported results were consistent with the KCRV. This KCRV can now be used in the further regional comparisons.</P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>