| According to the theory of multi-rigid-body, finite element method and structure optimization design, thorough researches of some large caliber snipe rifle are carried in this thesis. The main research contents and results are as follows:(1)Via the collaboration with the three dimensional entity modeling software SolidWorks, the virtual prototype model of some large caliber snipe rifle, which is based on the theory of multi-rigid-body and logically simplified, is established in the modeling environment of ADAMS.(2) The kinematics characteristics of the main mechanisms, including the blocking mechanism, the feed mechanism and the extraction and ejection mechanism, are simulated and analyzed. Through the simulation, the loads of the key parts and components, including rifle barrel, barrel extension, bolt, bolt carrier, breech, receiver, are obtained, which provide the necessary data for the finite element analysis and structure optimization.(3)The structure characteristics and the loads of the key parts and components are carefully analyzed. Considering the accuracy requirement and the economic efficiency, the reasonable finite element analysis models are built in HyperMesh.(4)Utilizing the finite element analysis model above, the static strength of the key parts and components are analyzed separately in different sub cases. The stress and displacement parameters are obtained. According to the strength criteria, the strength properties of the key parts and components are checked.(5)According to the results of static analysis, the structure optimizations of receiver and breech are carried to decrease the weight of them, which are based on the theory of topology optimization. The three dimensional entity models and the finite element models of receiver and breech are rebuilt., Comparing with the mechanical properties fore and after optimization, the conclusion indicates that topology optimization can provide precious design considerations in lightening the weight of mechanical structural. |
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