一种新型复合材料黏弹阻尼杆设计

Design of A New Composite Viscoelastic Damped Strut

针对复合材料杆阻尼偏小的问题,文章提出了一种新型复合材料黏弹阻尼杆设计,通过将约束层分段来增大黏弹阻尼层的剪切变形,在保证较高轴向刚度的同时,大幅度提升了杆的轴向阻尼。完成了复合材料黏弹阻尼杆的设计、制造与模态试验验证。试验结果显示:该阻尼杆一阶轴向模态阻尼相比无阻尼杆提高了23.7倍,且轴向刚度相比无阻尼杆未有下降,验证了阻尼杆设计的合理性;此外,分析结果与试验结果吻合较好,说明了阻尼分析模型的正确性。该阻尼杆设计可应用于航天器中各类撑杆或桁架结构,以改善系统的阻尼特性,降低航天器结构在动载作用下的响应。

Aimed at the problem of low damping of composite strut, this paper proposes a new de-sign of composite viscoelastic damped strut using the segmented constrained layer to enhance the shear deformation of the damping material for vibration energy dissipation. The advantage of the damped strut is that it can be used in main load transfer path and the axial damping can be sub-stantially increased with high axial stiffness. The test article has been designed, fabricated and test. The test results indicate that the axial damping of the damped strut is raised 23. 7 times compared with undamped strut with the axial stiffness undecreased. Numerical results correlate well with the test results proving the validity of the proposed FE model for damping prediction. This damped strut design can be used for supporting strut or member of truss in satellite struc-tures to enhance system damping and decrease dynamic response.