排序方式: 共有113条查询结果,搜索用时 30 毫秒
91.
Evaluation for Success Probability of Chaff Centroid Jamming 总被引:1,自引:0,他引:1
As the chaff centroid jamming can introduce the guiding error of the anti-warship missile's seeker and decrease its hitting probability,a new quantitative analysis method and a mathematic model are proposed in this paper to evaluate the success jamming probability.By using this method,the optimal decision scheme of chaff centroid jamming in different threat situations can be found,and also the success probability of this scheme can be calculated quantitatively.Thus,the operation rules of the centroid jamming and the tactical approach for increasing the success probability can be determined. 相似文献
92.
93.
空投雷弹斜入水初始弹道数值分析 总被引:3,自引:0,他引:3
为了研究空投雷弹斜入水的水下弹道动态特性,采用有限元分析程序ANSYS/LS-DYNA显式动力方法建立了斜入水数值模型,利用ALE算法和ALE-Lagrange耦合运算功能数值模拟了入水初始弹道,分析了尖拱体斜入水初始条件对水下初始弹道的影响,以及网格划分尺寸与数值计算稳定性的关系以确保结论的正确性.数值结果表明,小质量尖拱体小角度斜入水会引起水下初始弹道大偏移,可以通过调节质量或入水姿态来抑制忽扑甚至弹跳行为,初始入水弹道依靠于入水初始条件. 相似文献
94.
95.
以ANSYS软件为工具,分析了不同的简化建模方法带来的误差,从而确定合理的建模方法,求解出水下航行器连接盘的固有特性。 相似文献
96.
斜入水高速冲击的理论建模及缓冲分析 总被引:4,自引:0,他引:4
以入水冲击的理论动力学和入水弹道学理论为基础,根据鱼雷头部尖拱的结构外型,采用精确形体法建立斜入水高速冲击运动学和动力学耦合模型,充分考虑入水冲击引起的液面隆起现象以及流体阻力的影响。编制入水冲击耦合冲击的时间步进仿真程序,比较液面隆起现象对高速入水冲击载荷的影响,以及给出了入水初始状态条件和入水冲击载荷之间的关系和入水过程中的转动力矩的变化规律。最后比较尖拱体和截头尖拱体以50°角斜入水高速冲击的过载值,分析采用尖拱体进行缓冲卸载和截头尖拱体起到防止弹跳的理论原因。这为缓冲头帽的结构优化,忽扑、击水弹跳现象或后继的弹道提供预报以及为入水冲击缓冲技术提供了理论依据。 相似文献
97.
98.
99.
Reducing the self-noise and radiated noise of torpedo is an effective way to enhance its detection and concealment capabilities.After discussing the basic principle on noise and vibration control and main noise sources in torpedo,the application of damping treatment for noise and vibration absorption was proposed in this paper.Compared composite materials(damping and metal materials)used as segment joint,their different contributions to the damping performance of base structure were investigated.The results show that the damping material can be used as segment joint effectively in vibration control.Taking cantilever beam as an example,four different damping treatments were compared in natural frequency and damping loss factor,the results show the influences of different damping layer layouts on the structure damping performance,and offer a reference for the torpedo shell design. 相似文献
100.
水下航行器轨迹跟踪控制与仿真 总被引:2,自引:0,他引:2
为了使水下航行器按照预定的轨迹运动,需要水下航行器的控制系统具有较强的鲁棒性和抗干扰能力,因此该文提出了采用横向轨迹误差法和视线法组合导引的基于滑模的水平面轨迹控制方案,针对“211AUV”自治式水下航行器,给出了简化的水下航行器水平面运动模型,分别给出横向轨迹误差法和视线法的滑模控制方程。并分别对横向轨迹误差法、视线法以及横向轨迹误差法和视线法组合导引法三种方法进行仿真分析,最终的仿真结果表明横向轨迹误差法无法单独完成轨迹导引,视线法的轨迹跟踪误差较大,而横向轨迹误差法和视线法组合导引法具有良好的轨迹跟踪能力,能够保证水下航行器进行各种循迹航行任务。 相似文献