Abstract: In order to meet the development needs of large caliber naval gun, a loading mechanism based on the metamorphic principle is proposed. The structure of loading mechanism is designed by using the metamorphic principle, and the motion description and principle analysis of the structure are conducted by combining the kinematic diagram of mechanism. The flexible rod is divided into some beam elements by using finite element discrete method, the deformation of beam elements is descripted under the mixed coordinate system, and a dynamic equation of the flexible rod is presented. A rigid-flexible dynamic equation is established by using Hamilton variational principle. The simulation result is gotten through the combined simulation of Adams and Ansys. The result shows that a big ammo-feeding error exists in the loading mechanism based on the metamorphic principle when the system moves in a large range at a high-speed. The influence of the flexible deformation of rod on loading accuracy should be considered in the research of large caliber naval gun based on the metamorphic principle.

Key words: ordnance science and technology, metamorphic principle, loading mechanism, rigid-flexible coupling, ammo-feeding error