• 제목/요약/키워드: 위상차법

검색결과 2건 처리시간 0.014초

眞圓度 測定器의 誤差特性에 대한 解析 -위상차법- (An Analysis of Performance Error of Roundness Measuring Instrument -by phase different method-)

  • 한응교;허문석;박익근
    • 오토저널
    • /
    • 제10권3호
    • /
    • pp.31-37
    • /
    • 1988
  • A phase different method to evaluate the instrument error of roundness measuring instrument and the form error of specimens for the calibration of the instrument is used. An instrument with a rotary table supported by an air bearing was calibrated by using the standard balls as a standard. The calibration was carried out repeatedly by setting the same ball in 12 phase angles(per 30.deg.) on the table and by recording their roundness errors with a magnification of 100,000 times. As a result of data analysis of all the observations, readout at each of 144 orientations(per 2.5.deg.) from recorded data file, the error of performance of the instrument and the specimens are separated. In the particular instrument used in the present experiment, the error of the instrument was determined with the accuracy of 0.0164 (.mu.m) and the form error of the specimens was determined with the accuracy of 0.0264,0.0172(.mu.m), respectively. If the instrument was calibrated by using the above specimens, then the accuracy of the measurement of roundness error can be improved to about 0.017 (.mu.m).

  • PDF

내부혼합형 이류체 분사노즐에서 발생한 분무내 액적들의 크기와 속도의 상관관계 (Correlation between size and velocity of drops in a spray from an internal mixing twin-fluid atomizer)

  • 김상진;히로야스 히로유키
    • 한국분무공학회지
    • /
    • 제3권1호
    • /
    • pp.27-33
    • /
    • 1998
  • Correlations of drop size and velocity in a spray from the disintegration of liquid jet and liquid film from an internal mixing twin-fluid atomizer, were determined by phase Doppler method. The distribution pattern of Sauter mean diameter(SMD) in a spray was changed by a behavior of liquid flow. As smaller droplets became faster and slower easily by the surrounding conditions, the correlation between drop size and mean velocity was found to be varied as next 3 steps; firstly smaller droplets have a higher mean velocity at the area near atomizer, droplets have almost the same mean velocity and finally larger droplets have a higher mean velocity at the area far from an atomizer.

  • PDF