Study on vibration characteristics of large caliber naval gun cradle based on similarity theory

Aiming at the problems of long development cycle and high cost of large-diameter naval gun, the similarity analysis of vibration characteristics of cradle, the key component of large-diameter naval gun, is carried out. Based on the similarity principle, the modal similarity relationship between the original cradle model and the reduced scale model is established, the 1:4 reduced scale model of cradle and bracket is designed and processed, the numerical solution and Simulation of the theoretical model are carried out, and the modal test of the experimental model is carried out. The results show that the error between the original predicted data of the first six natural frequencies of the scaled model modal test and the numerical solution of the original structure is less than 10%, and the test modal shape is close to that in workbench modal simulation. It can provide some reference value for the initial design vibration characteristics analysis of key components of large caliber naval gun.