統計的 에너지 解析을 利用한 板構造의 振動減衰 硏究 = (A) Study on the Vibration Damping of Plate Structure by Statistical Energy Analysis

다국어 초록 (Multilingual Abstract)

The vibration of low frequency in a missile structure cause a flight instability and the energy of high frequency damages the structure. In flight, the load in kind of shocks causes the both phenomena concurrently. So the methods for reducing the vibration in a wide range is inevitable.
This paper investigate the effect of fastening, the rubber treatment with plates in a connected structure.
The result is summarized as fellows
1) The reducing of joining fasteners does not have influence on the increase of damping.
2) In case of rubber treatment only, the effect of damping increase is negligible. The result shows only the effect of mass increase. Its effect of damping shows over the range of 1 kHz
3) In case of additional attachment of aluminum plates, no difference is identified. But when the shape of plate attachment is coincident to the mode shape, then damping ratio increase drastically. This damping treatment is effective over the range of 300Hz. But below 300 Hz, the damping effect decrease below, careful attention should be payed for a applications.
From those results, the passive treatment like the rubber or plate treatment for the reduction of the vibrations is not effective and active treatment should be considered for this purpose.
In addition to the above statement, using a modal and ESEA test are supplemental each others in a treatable range of frequency. It can be used for the study of vibrations in a wide range of frequencies.

목차 (Table of Contents)

• 목차 = ⅰ
• Nomenclature = ⅱ
• List of Tables = ⅲ
• List of Figures = ⅳ
• List of Photos = ⅴ
• Ⅰ. 서론 = 1
• 1.1 연구배경 = 1
• 1.2 연구동향 = 2
• 1.3 연구목적 및 내용 = 3
• Ⅱ. 본론 = 5
• 2.1 통계적 에너지 해석 (SEA, Statistical Energy Analysis) = 6
• 2.2. 통계적 에너지 해석을 위한 실험기법 = 9
• Ⅲ. 실험 = 12
• 3.1 실험편 (시편) = 14
• 3.2 실험방법 = 19
• 3.2.1 고유진동 실험 및 감쇠비 계산 = 20
• 3.2.2 ESEA 실험 및 손실계수의 계산 = 22
• Ⅳ. 실험결과 및 고찰 = 25
• 4.1 고유진동 실험결과 및 고찰 = 26
• 4.2 ESEA 실험결과 및 고찰 = 44
• 4.2.1 감쇠손실계수 (DLF) = 44
• 4.2.2 결합손실계수 (CLF) = 48
• 4.2.3 고찰 = 54
• 4.2.4 ESEA 결과의 검증 = 55
• Ⅴ. 결론 = 59
• 참고문헌 = 60
• ABSTRACT = 63