阻尼层复合材料夹芯梁的动力学性能OA北大核心

The partial differential vibration equations of damping layer composite sandwich beam were deduced combined with the principle of Hamiltons Principle.Then,these vibration equations were solved by means of the closed-form Navier method,and the calculated result was validated versus the data of the published literature.Fi-nally,the influence of changing parameters of the damping layer composite beam on its dynamic properties was stud-ied.The results show that:The natural frequency decreases gradually and the loss factor tends to go from ascent to descent with the increase of length of beam,and there is an optimal value of length in the dynamics design.The nat-ural frequency increases gradually and the loss factor tends to go from ascent to descent as the shear modulus of the damping layer is increased,and there is an optimal value of shear modulus in the dynamics design.With the in-crease of thickness of damping layer,the natural frequency decreases gradually,the first-order loss factor increases gradually and the other loss factors tend to go from descent to ascent.The loss factor of damping layer has less influ-ence on the natural frequencies.