Research On Dynamic Characteristic Of Feeding System Of Jacking Shells Device Of Large Caliber Naval Gun

As the traditional shipbome weapon, navy gun has advantages of quick reaction, large quatity of bombs carrying, strong capacity of continous fighting, high reliability, and low cost,etc.; which plays significant role in naval battles. Basing on collection and analysis of information about shipboard weapons overseas and domestic, the author in this essay comprehensively analyzes all kinds of automation ammunition silos and technology of stereoscopic silos of heavy calibre navy gun, and proposes a brand-new integrated automation silos solution in supplying ammunition, which improves storing environment for ammunition and ammunition transferring efficiency, and realizes direct ammunition feed to gun turret automatically.As the important part of the integrated automation silos in supplying ammunition,Jacking Shells Device is the executing part to realize single launch of ammunition. Therefore,the dynamic characteristic of Jacking Shells Device will directly affect the reliability of the system for the bomb rate and system operation. In this PaPer, by the combination of methods of theoretical analysis and experimental modal analysis, on the basis of kinetic theory of agency, Hertz contact theory, modal analysis theory, harmonic analysis theory and experimental modal analysis theory, the dynamic modeling and dynamic characteristics of the feeding system of Jacking Shells Device are researched.First, the overall layout and working principle of the integrated automation silos are introduced. According to the design guidelines of the Jacking Shells Device and the analysis of ammunition during operation, the overall structure and working sequence are designed,design parameters are determined and the electromechanical parameters are calculated.Second, by using spring-damper Model, equivalent dynamic model of joint surfaces of bearings, screw nut and rolling guideways in the feeding system are established. According to Lagrange equation, vibration differential of the feeding system is deduced. And stiffness characteristics of the joint surfaces are analyzed with Hertz contact theory.Third, according to the basic theory of vibration and considering the elastic support of both screw ends, the mode shape function is established. And the effects of feeding system component parameters for the first order natural frequency of the axial are analyzed. The modal analysis and harmonic response analysis about the feeding system of Jacking Shells Device are carried out, and comparing the 10-order natural frequencies and mode shapes between rigid and flexible connection , the importance of joint surfaces characteristics is drawn to dynamic characteristics of the machine. Harmonic analysis provides the basis to improve the system’s antivibration ability.Finally, according to the results of modal experiment, the natural frequency of the feeding system of Jacking Shells Device is measured. And comparing the experimental results and simulation results, the causes of error are summed to Provide a basis for further improvement of simulation and experiment.