摘要
In order to study the dynamic characteristics of multilayer fiber reinforced plastic(MFRP)shaft,the coupling model of three-dimensional equivalent bending stiffness theory and transfer matrix method is established,and the influence of thickness-radius ratio,length-radius ratio,layer angles,layer proportion,and stacked approaches on MFRP shaft dynamic characteristics is investigated.The result shows that the proposed coupling model has high accuracy in MFRP shaft dynamic performance prediction.The proportion of small-angle layers is the decisive factor of MFRP shaft natural frequency.With the increase of thickness-radius ratio and length-radius ratio,the natural frequency of MFRP shaft decreases.The natural frequency of MFRP shaft with the angle layers combination of±45°and±90°is smaller compared with the metal shaft no matter in simple/free boundary condition or simple/simple supported boundary condition.
为了研究多层纤维增强复合材料(Multilayer fiber reinforced plastic,MFRP)轴的动态特性,建立了三维等效弯曲刚度理论和传递矩阵法的耦合模型,研究了厚径比、长径比、铺层角度、铺层占比和堆叠方法对MFRP轴动态特性的影响。结果表明:该耦合模型对MFRP轴动态性能预测具有较高的精度。小角铺层占比是MFRP轴固有频率大小的决定性因素。随着厚径比、长径比的增大,MFRP轴的固有频率减小。无论在简支/自由边界条件还是简支/简支边界条件下,±45°和±90°铺层组合的MFRP轴的固有频率均小于金属轴。
