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| Dynamic Influence Analysis of a Small-caliber Rifle in Immersion Water Environment |
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| DOI：10.7643/issn.1672-9242.2022.06.004 |
| KeyWord:immersion water environment automatic rifle virtual prototype automata machine simulation kinematic characteristics |
| Author | Institution |
| LI Yue |
Nanjing University of Science and Technology, Nanjing , China |
| WANG Yong-juan |
Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| In order to study the influence of immersion water environment on the motion characteristics of a small-caliber rifle automata machine, the friction coefficient between the machine frame and the machine as well as between the machine frame and the guide rail of the automaton after immersion water was measured by friction coefficient meter, and the influence of concentration on the two friction coefficients was obtained. In accordance with the three-dimensional model of a small-caliber rifle, the virtual prototype model was established and verified on the ADAMS platform. On the basis of the above experience, the friction coefficients between the kinematic pairs after different river water immersions are loaded into the model, and the influence law of different river water concentrations on the motion characteristics of the automaton was obtained through simulation analysis. The test and simulation results show that the friction coefficient between the gun machine, the guide rail and the gun frame of a small-caliber rifle will increase with the increase of the immersion water concentration, while the recoil speed, the start speed of the re-entry, the re-entry speed and the radio frequency of the automaton will decrease with the increase of the immersion water concentration, among them, the recoil-to-position speed has the smallest decrease in the immersion water environment with different river water concentrations, with its decrease range is less than 10%, and the return-to-position speed has the largest decrease in the flooded environment with different river water concentrations, with its decrease range is 16.9%, but the maximum recoil speed of the automaton is independent of the river water concentration in the immersion water environment. Therefore, the immersion water environment will increase the friction coefficient between the kinematic pairs and step up the energy loss during the movement of the automata machine. When the immersion water concentration increases to 20 kg/m3, the recoil failure occurs, and the friction coefficient between the kinematic pairs does not affect the reentry of the automatic mechanisms. |
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