检索结果-南通市图书馆

Experimental and numerical study on the influence of shaped charge liner cavity filing on jet penetration characteristics in steel targets

引用

Defence Technology（防务技术） 2023年第5期23卷 60-74页

作者： Paweł Zochowski Radosław Warchoł Military Institute of Armament Technology 7 Wyszynskiego Str.Zielonka05-220Poland

penetration characteristic(size and shape of penetration craters made in high hardness ARMSTAL 30PM steel) of shaped charge jets formed after detonations of modified PG-7VM warheads was analyzed in the article. Modifications consisted in removing the frontal part of the grenade(fuse, ballistic cap and conductive cone) and introducing of the liner cavity filling made of polyacetal copolymer POM-C. The filings in the form of solid cones with three different heights(33%, 66% and 100% of H-the height of original PG-7VM liner) were placed inside of the hollow cone shaped charge liner. As opposed to the vast majority of previously published works(in which warhead optimization studies were focused on increasing of the depth of penetration in rolled homogeneous armor steel) the main aim of the presented modifications was to maximize the damage ratio(diameters of craters, inlet and outlet holes) of target perforated by shaped charge jet at the cost of the loss of part of the jet penetration capability. According to the best knowledge of the authors such approach to the use of the old PG-7VM warheads has not been analyzed so far. Taking into consideration high stock levels of PG-7VM warheads, and the fact that they are continuously being replaced by more efficient and more sophisticated high-explosive anti-tank warheads, it seems reasonable to look for alternate applications of the warheads withdrawn from the service. Thanks to the introduction of proposed modifications the warheads could be used by special forces or other assault units as directional mines or statically detonated cutting shaped charges as well as by combat engineers as universal charges used in various types of engineering or sapper works. The research included experimental penetration tests and their numerical reproduction in the LS-Dyna software with the simulation methodology defined and validated in previous works of the *** differences(average error = 10-20%) were identified between the experi

关键词： Shaped charge jet PG-7 grenade Armor steel target Finite element modeling penetration process

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effective Factors on Forming Precision in Patternless Casting Manufacturing Technique

引用

Tsinghua Science and Technology 2009年第S1期14卷 180-185页

作者：杨伟东颜永年张人佶刘丽冰 School of Mechanical Engineering Hebei University of Technology Department of Mechanical Engineering Tsinghua University

The patternless casting manufacturing (PCM) technique, which adopts a new concept of double scanning method, combines the principle of discreteness and deposition with resin-bonded sand technique. This paper is to evaluate the dimensional accuracy of sand mould on PCM. The two important factors—the liquid penetration rule in the space of particles and the shape and dimension of the agglomeration unit body, which influence the process parameters such as scanning speed, layer thickness, liquid flux on dimension accuracy, and surface qualities, were investigated systematically, thus the theoretical basis for these parameters was provided. Experiments on rapid manufacturing of sand mould were carried out, and the results of the free penetration and the constraint penetration well verified the relationship of the two factors and the process parameters.

关键词： patternless casting manufacturing agglomeration unit body penetration process permeability solidification sand mould

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FACTORS AFFECTING FORMING PRECISION IN PATTERNLESS CASTING MANUFACTURING

引用

Chinese Journal of Mechanical Engineering 2003年第2期16卷 209-212页

作者： Yang WeidongYan YongnianXu DanZhai LeiDepartment of Mechanical Engineering,Tsinghua University,Beijing 100084, China Department of Mechanical Engineering Tsinghua University 北京 100084

The patternless casting manufacturing(PCM) technique adopts a new method ofdouble scanning which combines the principle of discreteness and deposition with the resin-bondedsand technique. Two main factors, the liquid penetration regularities in the space between particlesand the shape and dimension of the agglomeration unit body, are studied qualitatively andquantitatively. This provides the theoretical basis for selecting the forming technical *** experiments verify the analysis.

关键词： agglomeration unit body penetration process permeability solidification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of penetration acceleration signal based on wavelet transformation

引用

Journal of Measurement Science and Instrumentation 2015年第3期6卷 223-228页

作者：王春常顾强安晓红中北大学机电工程学院山西太原030051

In order to analyze the composition and frequency distribution of acceleration signal in the process of projectile penetrating,this paper uses wavelet transform to decompose penetration acceleration signal to get the distribution of penetration acceleration signal in different frequency *** with the ideal acceleration signal curve and its characteristics,it can be concluded that the frequency range of the acceleration signal in the axis of the projectile and the vibration frequency range of the projectile are 31.25-62.5kHz and 62.5-125 kHz,***,the penetration acceleration signal curve is obtained by Simulink.

关键词： penetration process wavelet transform acceleration frequency distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：