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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 곽재섭
- 발행연도
- 2018
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이 논문의 연구 히스토리 (6)
2018
2017
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초록· 키워드
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A water meter is widely using to measure the amount of water flow. Most cases of the water inside of a water meter are exposed to a change of phase at a temperature below a freezing point in winter. This phase transition causes the serious malfunction such as shutdown of a process and breakage of a water meter because of volume expansion of inside matters.
In this paper, a new design structure of a water meter, which had a bellows tube, is proposed for preventing the breakage by freezing. Then breakage prevention effect was verified using finite element analysis. As the results of FEA on new design water meter, maximum magnitude of Von-Mises stress is 75.58MPa at working pressure of 0.3MPa and it belongs to a safe limit compared by a yield stress of a brass material. Also, bellows tube has extra volume about 90% and over compared with increased volume generating ice so it prevents pressure increase generated by lack of volume inside of water meter.
Through comparison with FEA results of optimized bellows tube and design standard of bellows tube by EJMA, dimensional stability of a bellows tube was evaluated and it confirmed that shape dimension of optimized bellows tube is safety.
Therefore, it is confirmed that the new water meter can afford to apply a bellows tube in order to effectively prevent the breakage.
In this paper, a new design structure of a water meter, which had a bellows tube, is proposed for preventing the breakage by freezing. Then breakage prevention effect was verified using finite element analysis. As the results of FEA on new design water meter, maximum magnitude of Von-Mises stress is 75.58MPa at working pressure of 0.3MPa and it belongs to a safe limit compared by a yield stress of a brass material. Also, bellows tube has extra volume about 90% and over compared with increased volume generating ice so it prevents pressure increase generated by lack of volume inside of water meter.
Through comparison with FEA results of optimized bellows tube and design standard of bellows tube by EJMA, dimensional stability of a bellows tube was evaluated and it confirmed that shape dimension of optimized bellows tube is safety.
Therefore, it is confirmed that the new water meter can afford to apply a bellows tube in order to effectively prevent the breakage.
목차
1. 서 론 11.1 연구배경 및 필요성 11.2 국내외 연구동향 42. 이론적 배경 72.1 수도계량기 종류 및 구조 72.2 형상 최적화 기법 102.2.1 완전요인 배치법 102.2.2 다목적 최적화 기법 112.3 벨로즈 튜브 (Bellows tube) 143. 동파 방지를 위한 수도계량기 구조 설계 173.1 결빙에 따른 압력 발생 메커니즘 173.2 상변화에 의한 수도계량기 영향 평가 223.3 동파방지 수도계량기 구조 설계 283.3.1 벨로즈 튜브를 채용한 동파방지 수도계량기 283.2.2 체적 팽창 효과 (Expanding effect) 324. 벨로즈 튜브 형상 최적화 394.1 완전 요인 배치법을 통한 형상 변수 주효과도 분석 394.2 다목적 최적화 설계 465. 벨로즈 튜브의 치수 안정성 평가 576. 결 론 61REFERENCES 63
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