Design and vibration reduction performance of honeycomb sandwich support rod for wind tunnel

For the support structure of wind tunnel tests, a honeycomb sandwich structure is used to embed the wind tunnel tail brace to form a honeycole test process. Using Rayleigh beam theory and equivalent method, the lateral bending dynamic model of the support rod is solved and the natural frequency expression of the lateral bending vibration of the support rod is obtained. Taking the static strength of the support rod as the optimization design objective, the honeycomb sandwich structure was quantitatively described and the optimal design scheme was obtained through orthogonal experiments. The simulation and calculation results of the proposed support and hollow support are verified and compared with each other. The error between the first three natural frequencies of the honeycomb sandwich support given in this article and the simulation results is less than 9.52 %, which proves that the calculation results are relatively accurate. On the premise of meeting the constraints and load requirements, the low order resonant deformation of the transient dynamics simulation analysis is reduced by 30.27 %, significantly improving the vibration damping ability of the wind tunnel support system.