온도변화에 따른 점탄성 감쇠 구조물의 모드특성 변화
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The viscoelastic materials and composite structures currently have a wide range of engineering applications, especially in ship, submarine and marine structures. The increasing use of composite materials in engineering structures has cause many new problems for structural maintenance, inspection and vibration control. Vibration damping becomes increasingly important for improvement of vibration and noise control, and fatigue and impact resistance in advanced engineering systems. The examination of environmental factors on structural vibration properties is important in order to reliably apply the vibration control techniques to engineering structures. Environmental conditions affect structural vibration properties in a complicated manner, so in this paper the variations of frequencies, mode shapes and damping with respect to temperature changes from 5 to 45 degrees Celsius are investigated. The modal properties are identified from vibration tests of cantilever beams using a Non-Linear Least Squares (NLLS) method.