查询词典 ballistic

At the same time, the ballistic limit curves of the Whipple shield in a velocity range from 0.5 km/s to 5.5 km/s was obtained. Comparing to the predicted curve from Christiansen ballistic limit equation, the experimental minimum critical projectile diameter is slightly greater than the prediction.

通过固定弹丸直径，改变弹丸撞击速度，寻找临界撞击速度的方法获得了铝合金Whipple防护结构在0.5～5.5 km/s撞击速度区间内的撞击极限曲线，并与由Christiansen撞击极限方程得到的撞击极限曲线进行了比较，结果表明，实验最小临界弹丸直径略大于预测值。

With the development of missile defense system,the penetration of ballistic missile will faces with a greater menace,and the midcourse of ballistic missile is the focus of countermine.

"国防支援计划"系统是由美国空军的空间和导弹系统中心研制的预警卫星系统，属于同步轨道导弹预警卫星，提供24h全球监视，载有红外传感器、电视摄像机和核爆炸探测器等设备，主要用于导弹预警和核爆炸探测。

In order to meet the required simulation precision and meet the real-time simulation in ballistic simulation calculation,this paper analyzes the selection method of the simulation step,and then introduces variable step integration methods in Runge-Kutta to Adams and educes Adams variable step integral formulas,and then put forwards a method by seeking zero of condition function in discontinuous nonlinear system of the ballistic simulation.

在弹道仿真计算中，为了既达到要求的仿真精度又能满足实时仿真，分析了仿真步长的选择方法，然后在龙格－库塔转阿当姆斯法中引入变步长积分方法，推导了阿当姆斯变步长积分公式，同时对弹道仿真中的间断非线性系统提出条件函数求零的方法来解算弹道。

Ballistic performance's simulative emulation and validation test of a certain projectile shows that the structure of projectile is fit for the needs of exterior ballistic stability, the data jumpiness of dispersion is within the range of normal, the resistance curve's rebounding phenomena is independent of the structure of projectile.

文中通过对某型弹丸外弹道特性的相似仿真计算和相似模拟验证试验结果表明，弹丸在结构满足外弹道飞行稳定要求的前提下，最大地面射程密集度数据跳动属正常散布，阻力曲线"反弹"现象与弹丸结构无关。

Ballistic performance s simulative emulation and validation test of a certain projectile shows that the structure of projectile is fit for the needs of exterior ballistic stability,the data jumpiness of dispersion is within the range of normal,the resistance curve s rebounding phenomena is independent of the str.

用外弹道相似性理论和模拟验证试验进行外弹道优化验证是分析研究中大口径炮弹外弹道特性的有效方法之一。

Based on water-entry dynamic and water-entry ballistic theories,the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena,and an oblique water-entry impact model coupled with ballistic and dynamic models are established.

以冲击体入水动力学和入水弹道学理论为基础，针对平头尖拱体入水冲击这个复杂物理现象，引入体现液面隆起现象的沾湿因子，用等效液面代替自由水平液面，建立了斜入水高速冲击的运动学和动力学冲击模型，其中动力学模型是根据平头尖拱体沾湿面的具体几何形状而建立。

Based on water-entry dynamic and water-entry ballistic theories, the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena, and an oblique water-entry impact model coupled with ballistic and dynamic models are established. According to the exact geometric shape of the wetted body surface, the dynamic model is established.

以冲击体入水动力学和入水弹道学理论为基础，针对平头尖拱体入水冲击这个复杂物理现象，引入体现液面隆起现象的沾湿因子，用等效液面代替自由水平液面，建立了斜入水高速冲击的运动学和动力学冲击模型，其中动力学模型是根据平头尖拱体沾湿面的具体几何形状而建立。

To create a mathematical model for the hydro-ballistic trajectory of high speed pellet entering water, the hydro-ballistic trajectory and cavity of sphere and pistol pellets entering water at three oblique angles and six velocities have been experimentally studied using a high-speed digital video recorder.

为了建立高速弹体入水弹道的模型，利用数字式高速录像机实验研究了球形与普通手枪两种弹丸在三个入水角、六种发射速度下斜入水的水中弹道轨迹与空泡。

The research contents and main conclusions are as follows:1. The present thesis adopted one-dimension interior ballistic model, regarding the ballistic spatial core as the unsteady quasi one-dimension airflow containing the friction and heat exchange between airflow and tube wall, considering the boundary layer unsteady, nonstationary condensable current; and employed the MacCormack finite difference method to write the program.

本文的研究内容及结论主要体现在以下几个方面： 1、采用了一维内弹道模型，把弹后空间的核心流部分考虑为包含气流与身管管壁发生摩擦和热交换的不稳定准一维流，边界层考虑为不稳定、非定常可压缩流，用MacCormack有限差分方法求解，编制程序进行计算，较为准确的得到了复合材料身管固壁瞬态温度场分析内边界条件所需的气流温度和对流换热系数结果。

The results show that the value of burning rate pressure exponent of propellant and its change law can bring about a great change of interior ballistic behavior, The new type high-energy propellant whose burning rate pressure exponent is decrescent as pressure increasing can obtain higher interior ballistic piezometric efficiency, and reduce the sensitivity of bore pressure and muzzle velocity on loaded conditions of propellant.

结果表明，发射药燃速压力指数的大小及其随压力的变化规律对内弹道性能有很大的影响，对于燃速压力指数随压力升高而减小的新型高能发射药，可获得较高的内弹道示压效率，降低膛压和弹丸初速对发射药装填条件的敏感性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。