• Title/Summary/Keyword: Variable Precision

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An Alternating Motion Technique Using Linear Variable Differential Transformers (선형변이 차동변압기를 이용한 왕복운동 계측기법)

  • 최주호;김윤겸
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.1073-1077
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    • 1996

  • This paper presents a recoil and counter recoil(R&CR) motion measurement method using linear variable differential transformers(LVDT). The output of a LVDT is obtained from the differential voltage of the 2nd transformers. As a sensor core is attached at the motion body, the output is directly proportional to the core motion. Displacement, velocity and acceleration are measure from the core length. With a comparison between the measurement result and the known value which is obtained by the precision steel tape, the accuracy and the usefulness of the proposed scheme is validated.

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A Study on the Suitable Number of the Exhaust Variable Valve Spring for Semi-active Muffler (반능동형 머플러의 배기가변밸브 스프링 적정상수에 관한 연구)

  • Park Se-Jong;Seo Ho-Chul;Son Sung-Man;Park Kyoung-Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5 s.182
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    • pp.137-142
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    • 2006

  • The muffler which reduce the exhaust noise and vibration from engine influence on the engine performance. Recently, exhaust variable valve has set up in the muffler controls the backpressure in the exhaust system. And the backpressure variation according to the exhaust variable valve opening has developed the engine performance. First, the preceding of structural analysis is needed and simulation experiment is requested for the study on the design factor to influence on the operation of the exhaust variable valve. In this study, setting up the various variables according to each composition element needed for the structural analysis of the exhaust variable valve, it is experimented the analysis on the influence of each design factor with the calculation of stress distribution and the displacement to cause about the backpressure for the valve through parameter study.

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