The Development of Dynamic Analysis Technology for the Small Arms with Mechanism and Structure Coupling Effects
| Autor: | Chiu, Chung-Jung, 邱重榮 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 The firing process of small arms involves multiple physical and complex models because the action time is brief (typically measured in microseconds), and propellants produce high temperatures and pressurized gases during the burning process. These factors have made the research of small arms difficult. Research institutes and researchers must perform experimental tests that require a considerable amount of manpower, materials, and time. Mechanism systems exhibit large displacement and small strain. Engineers often analyze the kinematic behavior of mechanism systems by assuming that the elements are rigid and ignoring the effects of operational stresses and strains. For high-speed, high-impact mechanism systems such as small arms, transient mechanical analysis is necessary to ensure safety and to reduce system weight. In this study, nonlinear transient finite element analysis methods are used to simulate the kinematic and in-bore behavior of small arms after being fired. Material deformation, joint clearance, and the coupling behavior between a mechanism’s kinesis and structural deformation are considered. The accuracy of the computational results was verified based on reference data and gunshot experiments. For bolt-carrier mechanism systems, a 5.56-mm rifle and a new type of sub-mechanism gun were analyzed. The proposed simulations enable observing the kinematic status, transient stresses, and strain history of the small arms simultaneously. These data could be used for optimal design or the life prediction of key structures. In addition, a 9-mm pistol and the 5.56-mm rifle in-bore behavior were also simulated. This simulation allowed the collection of data for the entire shot trajectory, including movement, velocity, acceleration, rotation, stress, and strain of the bullet and the gun barrel. The technology developed in this study could help engineers to efficiently develop small arms and to save substantial amounts of resources in the future. This analysis method could also be adopted for other types of dynamic mechanism systems. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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