• Title/Summary/Keyword: 블러스터

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A Study on Noise Reduction Characteristics of Active Noise Controller Using Hysteresis Control Method (히스테리시스 제어 방식을 이용한 능동 소음 제어기의 소음저감 특성에 관한 연구)

  • 이승요;김홍성;최규하
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.2
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    • pp.35-40
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    • 1997
  • The hysteresis control method has been frequently used for current control of power conversion equipments or motor drive systems. This method makes the measured signal follow the reference signal by changing the control signal whenever the error signal exceeds the preset band width. In this paper, hysteresis control method with fast response characteristics is applied for active noise control to suppress acoustic noise. Both Pentium processor and sound blaster 16 are used for experimental implementation, which executes A/D, D/A conversion and also is used as operating source of loudspeaker for audible noise cancellation.

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Development of CANDU Pressure Tube Integrity Evaluation System : Its Application to Delayed Hydride Cracking and Blister (CANDU 압력관에 대한 건선성평가 시스템 개발-지체수소균열 및 블러스터 평가에의 적용)

  • 곽상록;이준성;김영진;박윤원
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.174-182
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    • 2002
  • The integrity evaluation of pressure tube is essential for the safety of CANDU reactor, and integrity must be assured when flaws or contacts between pressure tube and surrounding calandria tube are found. In order to complete the integrity evaluation, not only complicated and iterative calculation procedures but also a lot of data and knowledge are required. For this reason, an integrity evaluation system, which provides an efficient way of the evaluation with the help of attached databases, was developed. The developed system was built on the basis of ASME Sec.? and FFSG issued by the AECL, and applicable for the evaluation of blister, sharp flaw and blunt notch. Delayed hydride cracking and blister evaluation modules are included in the general flaw and notch evaluation module. In order to verify the developed system, several case studies have been performed and the results were compared with those from AECL. A good agreement was observed between those two results.

Development of CANDU Pressure Tube Integrity Evaluation System;Its Application to Sharp Flaw and Blunt Notch (CANDU 압력관에 대한 건전성 평가시스템 개발;예리한 결함 및 둔한 노치에의 적용)

  • Gwak, Sang-Rok;Lee, Jun-Seong;Kim, Yeong-Jin;Park, Yun-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.1 s.173
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    • pp.206-214
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    • 2000
  • The pressure tube is a major component of the CANDU reactor, which supports nuclear fuel bundle and it's containment vessel. If a flaw is found during the periodic inspection from the pressure tube s. the integrity evaluation must be carried out. and the safety requirements must be satisfied for continued service. In order to complete the integrity evaluation, complicated and iterative calculation procedures are required. Besides, a lot of data and knowledge for the evaluation are required for the entire: integrity evaluation process. For this reason. an integrity evaluation system, which provides efficient of evaluation with the help of attached databases, was developed. The developed system was built on the basis of ASME Sec. XI and FFSG(Fitness For Service Guidelines for zirconium alloy pressure tubes in operating CANDU reactors) issued by the AECL, and covers the delayed hydride cracking(DHC). This system does not only provide various databases including the 3-D finite element analysis results on pressure tubes, inspection data and design specifications but also is compatible with other commercial database software. In order to verify the developed system, several case studies have been performed and the results were compared with those from AECL. A good agreement was observed between those two results.