Study of the Measurement of Young's Modulus and Loss Factor for a Viscoelastic Damping Material Using a Multi Degree of Freedom Curve Fitting Method and RKU Equation

doi:2011.25.1.67

J. Ocean Eng. Technol. > Volume 25(1); 2011 > Article

J. Ocean Eng. Technol. 2011;25(1):67-72.
DOI: https://doi.org/10.5574/KSOE.2011.25.1.067

Min Cheon-Hong,Park Han-Il,Bae Soo-Ryong,Jeon Jae-Jin

Graduate School of Korea Maritime University,Department of Ocean Engineering Korea Maritime University,Agency of Defense Development,Agency of Defense Development

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

민천홍,박한일,배수룡,전재진

한국해양대학교 대학원,한국해양대학교 해양공학과,국방과학연구소,국방과학연구소

Keywords: Curve-fitting, Loss factor, Viscoelastic damping material, Young's modulus, Vibration analysis

핵심용어: 곡선맞춤, 손실계수, 점탄성 감쇠재, 탄성계수, 진동해석

Abstract

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.