【摘要】 设计了一种含有工字形支撑的CFRP-钢质板架式筏架,通过调整铺层角度改变各CFRP组件的刚度分布,使用模态应变能法计算了各CFRP组件不同铺层下的阻尼比,在ABAQUS软件中进行了不同刚度、阻尼、质量分布的谐响应分析,利用振级落差法评价了不同组合下筏架的减振性能。结果表明,含CFRP组件的筏架相较于全钢质筏架在低频段减振效果好4～10 dB左右,CFRP筏架上/下板组件的最小弯曲刚度与减振效果在低频段成负相关,CFRP工字形支撑组件的阻尼比与减振效果在高频段成正相关,钢质组件主要影响系统的一阶共振频率。更多还原

【Abstract】 A raft made of CFRP-steel with I-shaped supports and plate-frame is designed. The stiffness distribution of each CFRP component varies with the laying angle. The damping ratio of each CFRP component under different layers is calculated using the modal strain energy method. The harmonic response analysis of different stiffness, damping, and mass distribution is carried out in ABAQUS. The vibration level drop method evaluates the vibration reduction performance of the raft frame. The results show that the CFRP raft has a better vibration reduction performance than all-steel rafts with a low-frequency range of approximately 4～10 dB. The minimum bending stiffness of the upper/lower plate components of the CFRP raft has an inverse proportional to the vibration reduction effect in the low-frequency range. The damping ratio of the CFRP with an I-shaped support component is proportional to the vibration reduction effect in the high-frequency range. The steel component will affect the first-order resonance frequency of the system.更多还原