Finite element modeling of spatial pipeline with locally attached damping layer and position optimization of damping layer

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 147-157.

LI Jiaxin1,2, WANG Dong1,2, SUN Wei1,2

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Abstract

In order to reduce the harmful vibration of aero-engine pipeline in service stage, this paper describes a method to reduce the vibration of pipeline by attaching viscoelastic damping layer locally on the surface of pipeline, which mainly includes dynamics finite element modeling of damping layer-spatial pipeline system and position optimization of damping layer. In the modeling, based on ANSYS platform, a parametric finite element model of damping layer-spatial pipeline is established to satisfy the calling of optimization algorithm. At the same time, two kinds of damping are introduced into the whole model, which are the support damping of clamp and the material damping of viscoelastic damping layer. In the aspect of position optimization, an optimization model with the attaching position of damping layer as the design variable and the minimum of first-order maximum resonance response as the optimization objective is created, and the solution flow for the optimization model is given by genetic algorithm. Finally, a case study is carried out, and the rationality of the damping layer-spatial pipeline analysis model is verified by the experimental system of spatial pipeline with damping layer. Based on this, the position optimization of damping layer is carried out, and the damping layer attaching position scheme which minimizes the resonance response in the movable range is obtained. The rationality of the optimization results is proved by numerical comparison with five random schemes.

Key words

viscoelastic damping layer / spatial pipeline / finite element modeling / optimization of attaching position / genetic algorithm

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LI Jiaxin1,2, WANG Dong1,2, SUN Wei1,2. Finite element modeling of spatial pipeline with locally attached damping layer and position optimization of damping layer[J]. Journal of Vibration and Shock, 2024, 43(3): 147-157

References

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