Estimating Projectile Perpendicular Impact Velocity on Metal Sheet Targets from the Shape of the Target Hole

Abstract:  The correlation between bullet hole shapes in metal and projectile impact velocity was examined. A series of shots were fired from an M-16A1 assault rifle of 5.56 mm caliber toward a 1-mm thick metal target. All shots were fired at a perpendicular angle to the metal sheets, and the velocity was measured just before the projectile hit the target. Velocities ranged between 400 and 900 m/sec. From the replica of the shooting hole, a perpendicular plane was created, showing the symmetrical properties of the hole. The best mathematical equation describing the shape of the entrance hole was the exponential function in the form:
The empirical equation of the hole defined using the regression method is:
This equation describes the general shape of shooting holes created by velocities ranging from 440 to 750 m/sec. From this equation, one can estimate the bullet velocity when it hits the target.     

一例枪支走火案件的分析检验步骤和方法

在实践中,我们经常会碰到由于枪支走火、跳弹等致人死亡的意外事件,对此类案件的分析、检验往往有一定的难度,特别相隔较长一段时间后,许多信息随着时间的流逝而不能加以充分利用时。所以对此类案件该如何利用有限的资源信息以准确认性,这是非常关键的问题。本文结合一具体案例,提出对此类案件进行分析检验的步骤和方法。     

反馈在射击教学训练中的作用

反馈,在各项运动技能形成中,都具有极其重要的作用。同理,反馈在人民警察手枪射击教学训练中,能够有效地提高教学效果、促进学员射击技能的形成,使学员尽快掌握动作要领、纠正不足和错误的动作,从而提高动作质量、提高射击水平。     

Accuracy and Reproducibility of Bullet Trajectories in FARO Zone 3D

With three-dimensional (3D) laser scanning technology and software packages, the practice of documenting and measuring bullet trajectories has benefited from greater accuracy and reproducibility. This study investigated the accuracy and reproducibility of the bullet trajectory tools in the software package, FARO Zone 3D (FZ3D). Twelve participants were provided laser scanner data for 21 bullet trajectories on drywall panels with impact angles between 25° and 90°. When the impact plane was manually aligned by the operator, 75% of the absolute errors were within 0.91° and 0.98° for the azimuth and vertical angles, respectively. The vertical angle improved to 0.47° when impact plane alignment was taken with respect to gravity (no operator influence). Thus, manual alignment is shown to be subject to greater error than alignment with gravity. However, this study shows that the accuracy and reproducibility of the FZ3D bullet trajectory tools to be comparable with previous research studies.     

根据霰弹丸分布图形推断射击距离的实验研究

目的 建立推断制式霰弹猎枪射击距离的数学计算公式和方法。方法 选用国产制式12号及16号猎枪,配用1号及3号猎枪弹,以1至12m距离射击实验靶纸,获得霰弹分布图形360例,将图形测量数据与实验距离进行数学理论分析。结果 建立6种不同枪弹种类推断射击距离d的计算公式,分别为12-1型(缩口)ss=-0.2+0.44d;12-1型(无缩口)ss=-0.94+0.63d;12-3型(缩口)ss=-0.59+0.52d;12-3型(无缩口)ss=-0.36+0.34d;16-1型s=-0.37+0.30d;16-3型s=-0.16+0.23d,并用Visual Basic5.0软件编制通用程序汇总软件。结论 本研究建立的方法简单实用,误差较小,可以用于推断制式猎枪的射击距离。     

学生在射击课教学中不同阶段的心理活动

在公安院校的射击教学中,应全面了解学生在不同阶段和不同条件下的各种微妙心理活动,采取灵活多样的教学训练 方法和手段来提高射击教学质量。     

基于全国联网的公安民警训练信息化平台的研究

在公安民警培训过程中,信息化训练管理平台的引入可以有针对性地订制公安民警培训计划,并且建立各自的培训档案,该档案既可以作为定期进行技能考核的依据,又可以作为其他方面考核的依据。有效地利用信息化技术可以大大增强公安民警的培训效果、提高公安民警培训的主动性和积极性、促进我国公安民警专业化素质的快速提高。     

警察实用手枪射击训练“三元组合模式”

依据警察实战手枪射击枪战特点,把警察实战射击场景归纳为＂受训者主体动作＂、＂实战场景中介＂、＂目标客体＂这三个决定着警察实战胜负的基本技术元素,以此为基础来定义三元组合训练模式的概念,确定三元组合训练模式的目标,分析三元组合训练模式的内容和实施。