Abstract
Constrained layer dampers (CLD) are in widespread use for passive vibration damping, in applications including aerospace structures. However, the introducing of the damping layer can reduce the stiffness of the sandwich structures. A viscoelastic material filling (VMF) is chosen to balance structural and vibrational performance of lattice truss in this work. The recently brought forward 3D Kagome truss with face sheet was manufactured by selective laser sintering technology and the thermosetting polyurethane was chosen as the viscoelastic filling material. A novel complex modal analysis finite element method for Hybrid composite lattice truss sandwich is introduced in this paper. Dynamic analysis experiment results show that the VMF method is found to be effective in reducing the vibration amplitude and it has the potential for band-gap design. The VMF method can provide high stiffness at low mass and considerable vibrational performance at low cost and it can be considered as a general vibration design method in lattice truss manufacture.
Highlights
To seek optimal solutions satisfying both structural and vibrational requirements, an excellent combination of stiffness and damping can be obtained by choosing suitable materials and geometric configurations of the face sheets and cores
The purpose of the present work is to explore a way to balance structural and vibrational performance of lattice truss by viscoelastic material filling (VMF)
Kagome structure with face sheets were manufactured by the selective laser sintering technology and fixed vibration modal tests showed that compared with the traditional Kagome lattice plate, the acceleration amplitude of VMF Kagome lattice plate at natural frequency is reduced by 18.19 dB
Summary
To seek optimal solutions satisfying both structural and vibrational requirements, an excellent combination of stiffness and damping can be obtained by choosing suitable materials and geometric configurations of the face sheets and cores. The method of constrained layer damping (CLD) was introduced by Kerwin[12] and it has been the most used technique in vibration suppression[13]. Many optimization techniques such as Genetic Algorithm[14], Moving Asymptotes method[15], Topology Optimization method[16], modal strain energy method[17] and recently Double Shear Lap-Joint-configuration[13,18] were successfully adopted to optimize the location and dimensions of CLD, in order to maximize the structural damping while minimizing additional mass. Filling of the core voids with foam or viscoelastic material have been investigated in hybrid structures design to balance structural and vibrational performance of lattice truss. The VMF method is generally based on filling viscoelastic materials to the voids in the lattice structure so that the viscoelastic material can absorb the vibrational energy. The recently brought forward 3D Kagome[21,22] truss (Fig. 1) with face sheet was taken as an example to demonstrate this new optimization method
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