共查询到20条相似文献,搜索用时 62 毫秒
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Jin-Sung Jang Hyung-Gun Sung Tae-Seong Roh Dong-Whan Choi 《Journal of Mechanical Science and Technology》2013,27(8):2351-2357
A numerical code for interior ballistics using the Eulerian-Lagrangian approach was developed to analyze polydisperse systems. The internal flows in a gun barrel and the compressibility effects were calculated using the semi-implicit method for pressure-linked equations algorithm. Ghost cell extrapolation was used for the moving boundary with projectile movement. The numerical scheme and moving boundary method were verified through the free piston motion problem. The developed code, including the combustion of the propellant, was compared with simulations of 40 mm gun firings. The results of numerical analysis agree with the simulation results, confirming the reliability of the developed code. Comparative studies were conducted with the results of the interior Ballistics of high-velocity guns code (version 2) according to porosity and propellant size. The numerical analysis of the combustion and movement of individual propellants provides deeper insight into the mechanism of gun firing and the significant factors that influence muzzle velocity. 相似文献
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身管是火炮武器的重要部件,身管制造材料和加工工艺直接影响身管的质量。身管质量严重影响身管寿命,低质身管会导致火炮内弹道性能降低,射击精度下降,制约着武器效能的发挥。深入研究身管问题,分析了身管使用材料发展历程,归纳总结出身管的典型加工工艺,为身管的设计和使用提供参考。 相似文献
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Jin-Sung Jang Seok-Hawn Oh Tae-Seong Roh 《Journal of Mechanical Science and Technology》2016,30(4):1631-1637
Interior ballistics analysis is required for the development of the gun system. Interior ballistics is a complex phenomenon containing the propellant combustion and gas flow and is completed in tens of milliseconds during gun firing. Thus, some data cannot be directly measured by experiment. Numerical analysis is therefore traditionally used to understand the complex gun firing phenomena. In previous studies, the two-dimensional axisymmetric numerical method for interior ballistics using the Eulerian-Lagrangian approach has been developed. There are some limits in depicting the actual phenomena with two-dimensional models. Therefore, a three-dimensional numerical model has been built in the present study. Unlike the conventional method, the calculation has been conducted by separating the physical phenomena into the combustion part and the flow part for simplicity and efficiency. The internal flow in the gun barrel has been calculated by using the STAR-CCM+ and the source terms produced by the propellant combustion has been computed by utilizing the existing code. The developed numerical model has been compared with the AGARD gun results and the simulation of 40 mm gun firings. The reliability of the developed model has been confirmed because the results of the numerical analysis greatly agree with the simulation results. The basis of the three-dimensional analysis of the interior ballistics has been formed through this study. 相似文献
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Numerical and experimental studies on the dynamic behaviors of a gun that uses the soft recoil system 总被引:1,自引:0,他引:1
The conventional recoil mechanism of guns provides the retarding force on the gun to stop the rearward motion in the firing cycle. The concept of the soft recoil mechanism has been developed. This mechanism was introduced to reduce the firing shock and the reaction force due to the forward momentum of the recoiling parts prior to firing. This paper verifies the theory of the soft recoil mechanism and demonstrates its feasibility on a large-caliber gun system. Numerical simulation on recoil dynamics and shock response analysis were utilized in this study. A FORTRAN program, which was developed in a previous study, was employed for simulation. The shock response analysis utilized the shock response spectrum and the pseudo-velocity shock spectrum. As a result, a newly developed recoil system was proven to be applicable for guns in the near future with further refinements. 相似文献
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在进行火炮后坐运动动态模拟实验时,为了使被试火炮产生与实弹射击相同的后坐动态响应,需要对冲击加载载荷进行控制。通常可在冲量发生器和后坐部分之间加装缓冲器,利用缓冲器的刚度特性,控制传递到后坐部分的载荷,以实现与火药燃气形成的炮膛合力相同的变化规律。根据火炮后坐动态模拟实验的需求,应用新型弹性胶泥材料,设计了用于冲击载荷控制的加载缓冲器。利用被试火炮后坐运动的数学模型,在MATLAB/Simulink中建立了后坐动态模拟试验的仿真模型,对后坐运动及缓冲器参数进行了仿真计算。仿真结果表明,弹性胶泥缓冲器可以较好地实现火炮发射的炮膛合力,满足火炮后坐动态模拟实验的要求。 相似文献
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超高射速武器是一种新概念武器,其显著特点是射速高。身管是其关键部件,直接制约着武器效能的发挥。为了设计合理可用的身管,首先使用matlab软件进行数值模拟,得出了在给定条件下身管的受力情况。再对各种强度理论进行分析,在此基础上,采用平均压力法来设计身管。给出了某超高射速武器身管结构尺寸的设计结果。该技术研究可为超高射速武器结构设计提供一定理论参考。 相似文献
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针对广角极光成像仪整机Z向冲击试验后探测器损坏的问题,提出在镜头组件与头部框架间设置隔振器的解决方法。首先,确定隔振方案为被动局部隔振;然后,从材料、刚度和安装方式等方面完成金属橡胶隔振器的设计。接着,运用有限元方法对结构进行模态分析和冲击载荷响应仿真分析。最后,对广角极光成像仪整机产品进行了力学实验,实验结果与仿真分析结果一致。实验结果显示:安装隔振器后,探测器位置测点的正弦振动加速度响应最大降低了26.2%,随机振动加速度响应最大降低了72%,冲击加速度响应最大降低了48%,说明该隔振器具有显著的减振效果。在实验完成后对产品进行检测,发现产品并无异常,说明结构设计满足要求。 相似文献
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本文针对现有输油管道监控方式的不足,提出了基于双光谱热成像摄像机和智能分析监控系统,解决传统人工巡线和可见光视频监控无法全面有效监控的缺陷,并对其技术特点和应用进行了分析探讨。 相似文献
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基于多体动力学理论建立了考虑耳轴轴承间隙非线性的某型步兵战车自动炮刚柔耦合发射动力学模型.应用ANSYS有限元分析软件建立了双炮身管结构有限元模型并结合自动炮射击过程中力学特性和约束特性分析建立了自动炮刚柔耦合发射动力学模型;应用有限单元法对耳轴轴承间隙非线性进行了参数辨识,并准确分析了自动炮射击过程中耳轴轴承间隙对炮口扰动的影响,分析结果表明基于有限单元法的间隙非线性参数辨识方法能准确描述含间隙耳轴轴承的接触特性,为分析自动炮射击精度提供了准确的模型基础. 相似文献
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针对防空武器的发展,设计星形身管并对其进行强度校核。考虑到发射过程中身管内壁压力的变化特点,对传统身管和星形身管进行了有限元分析。由于身管可以简化为二维轴对称结构,故将身管内表面分段,分别施加膛压,分析身管强度。 相似文献
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In the present study, the initial wear behavior of the duplex layer consisting of an oxide film and a compound layer on gun bores was investigated. The duplex layer was produced by the gas-nitriding and the post-oxidization to the surface of the 5.56mm gun bores. The thickness of the duplex layer was measured from the specimen taken from a new gun barrel with an optical microscope. After real firing, the specimens were cut from the barrels. The microscopic wear behavior and phase identification of the duplex layer were observed by using a SEM and a XRD, respectively. A lot of surface cracks linked together to form the network of the cracks on the surface and the parallel cracks occurred in the interface between the oxide film and the compound layer. When the surface cracks and the parallel cracks join orthogonally, the spalling takes place. 相似文献
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Qianwen Huang Xinping Yan Yikun Wang Cong Zhang Yong Jin 《Journal of Mechanical Science and Technology》2016,30(12):5405-5412
An appropriate assessment of the dynamic behavior of marine propulsion shaft in ships is essential to enable optional delivery of power to the propeller and to minimize unnecessary vibration. Various vibrations coupling with each other can significantly influence the dynamical behavior of the shaft and threaten the reliability of ships. This paper presents a finite element analysis model with multiple constraint conditions to analyze the coupled transverse and longitudinal vibrations of a marine propulsion shaft. Based on this model, in addition to the coupled natural frequencies of each direction, the maximum acceleration are also determined. Furthermore, the simulation of an idling and loading vibration analysis is discussed and validated against experimental results, over a range of rotational speeds. The output of numerical simulation is found to agree with the corresponding results from experimental tests. Finally, an accurate and applicative FEA model for coupled transverse-longitudinal vibration of shaft has been obtained. 相似文献
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