다자유도 곡선 맞춤법과 RKU 기법을 이용한 점탄성 감쇠재의 탄성 및 손실계수 추정방법 연구

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 25; no. 1; pp. 67 - 72
• Main Authors: 민천홍, 박한일, 배수룡, 전재진, Min, Cheon-Hong, Park, Han-Il, Bae, Soo-Ryong, Jeon, Jae-Jin
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 01.02.2011
• Subjects: 해양공학
• ISSN: 1225-0767; 2287-6715

Offshore structures, such as a platform, a buoy, or a floating vessel, are exposed to several dynamic loads, and viscoelastic damping material is used to reduce the vibration of offshore structures. It is important to know the properties of viscoelastic materials because loss factor and Young's modulus of the viscoelastic damping material are dependent on frequency and temperature. In this study, an advanced technique for obtaining accurate loss factor and Young's modulus of the viscoelastic damping material is introduced based on a multi degree of freedom curve-fitting method and the RKU (Ross-Kerwin-Ungar) equations. The technique is based on a modified experimental procedure from ASTM E 756-04. Loss factor and Young's modulus of the viscoelastic damping material are measured for different temperatures by performing the test in a temperature-controlled vibration measurement room where temperature varies from 5 to 45 degrees Celsius.