【摘要】 随着现代化科学技术的不断发展,振动和噪声的控制日益成为一个迫切的问题并受到了工程界的重视,在飞机,宇航结构、仪表板,船舶等结构中,经常遇到金属板的随机振动,而当采用粘弹性约束阻尼板后可以在一定范围内抑制宽频带的随机振动。本文将粘弹性材料的剪切模量和损耗因子与温度、频率的关系用公式拟合。通过迭代计算了约束阻尼板在四边简支边界条件下频率和损耗因子。画了温谱图、频谱图和地毯图。从这些图中可以看出:采用某种粘弹性阻尼材料和一定厚度约束层的阻尼板在一定的温度和频率范围内控制阻尼板的振动能达到满意的效果。更多还原

【Abstract】 In this paper the relation among the shear modulus and the loss factor of the viscoelastic material with the temperature and the frequency are formulated and fitted by curves. The resonant frequencies and the corresponding loss factors of a rectangular simply-supported damped sandwich plates have been calculated by iteration method. The Temperature-Spectra plot and Frequency-Spectra plot and the carpet plot have been drawn. It can be concluded from there plots that vibration control of damped plates can be obtained in some range of temperature and frequency if the damped plater possess suitable thickness and appropriate viscoelastic mateial.更多还原