Research On Vibration Characteristics Of Cylinder By Lattice Structure

The zero thermal expansion lattice structure is applied to the optical tube of the optical imaging system of the laser guided air defense missile seeker.The optical tube filled with zero thermal expansion lattice can realize zero thermal expansion in the radial direction of the lens barrel,thereby ensuring the imaging precision of the optical system,ensuring the impact precision of the air defense missile,and providing an effective guarantee for the completion of the combat mission.However,during use,it was found that the vibration generated by the missile during flight also affects the imaging accuracy of the optical system.In order to solve this problem,the vibration characteristics of the zero-thermal expansion lattice-filled cylinder are studied by theoretical calculation,finite element simulation and experimental verification.The research results can be used to design the lattice-filled optical tube.The main contents of this paper are as follows:1.According to the application scenario of zero thermal expansion lattice structure,the equivalent density of the zero thermal expansion lattice structure and the calculation formula of equivalent elastic modulus are derived.Then,through theoretical calculation,ANSYS simulation and experimental verification,the lattice is analyzed and verified.The validity of the model for the equivalent density and equivalent elastic modulus of the structure.2.Based on the idea of equivalence,the zero-thermal expansion lattice-filled cylinder is equivalent to a uniform material cylinder.The natural frequency calculation model of the cylinder is established by theoretical derivation,ANSYS simulation and experimental verification,and the validity of the model is verified.3.The influence of the configuration parameters of the zero thermal expansion lattice on the natural frequency of the cylinder was studied by using the method of the control variable.The results of comparative analysis of theoretical calculations and finite element simulations reveal the influence of the configuration parameters of the zero thermal expansion lattice structure on the natural frequency of the lattice-filled cylinder,and provide data for the optimal design of the anti-vibration performance of the seeker optical tube.4.After adding the lattice-filled cylinder to the base,the modal analysis of the optical lens barrel is analyzed and verified,revealing that the optical lens barrel exhibits the same regularity as the natural frequency of the cylinder.According to the above research results,it is possible to optimize the anti-vibration performance of the optical lens barrel under the condition that the working condition is known.