压制兵器火控系统发展趋势分析

从部队编制体制变革,数字化部队建设,新技术、新装备、新材料的出现等多方面分析压制兵器发展面临的形势,以及国外压制兵器发展现状,总结分析压制兵器的发展趋势,并归纳提炼出火控系统应从信息综合化、系统模块化、系统体系结构分布化、功能一体化、火控射击控制闭环化和快速实时解算等6个方面发展趋势,以实现精确、快速、协同的综合武器控制.     

锥形量热仪在阻燃材料研究中的应用

锥形量热仪在阻燃材料研究中可以研究阻燃机理、阻燃剂在材料中的阻燃效果,评价阻燃材料的燃烧性和阻燃性以及烟和毒气的释放。     

我国重特大火灾事故发展趋势预测

对我国1997~2004年8年间重特大火灾事故的发生起数、死亡人数、受伤人数和直接经济损失四项指标进行了统计分析,并使用灰系统理论对2005、2006年全国重特大火灾事故的四项指标进行了预测。分析结果表明,我国近8年来的特大火灾事故的发生起数、死亡人数和受伤人数总体呈下降趋势,而直接经济损失有上升趋势。灰理论预测结果表明,2005、2006年我国重特大火灾事故的四项指标都将呈下降趋势。针对分析和预测结果,提出了预防和控制全国重特大火灾事故的对策。     

液态烃泵火灾隐患及防治对策研究

分析了液态烃泵在设计制造、密封失效、静电危害、安全管理等方面存在的火灾危险性,并从密封技术的改进、泵结构的改造、生产操作安全规程的制定和实施等方面探讨其预防对策,为石油化工行业液态烃泵的安全使用和消防技术管理工作提供参考依据。     

消防指挥学学科建设中应把握的几个问题

消防部队是一支执行灭火救援任务的军事化和专业化队伍,其军事性决定了消防指挥学专业的军事学学科门类,消防指挥学在被正确定位的基础上,消防指挥学学科建设要准确把握学科定位,总结其发展规律,加强理论体系建设等关键问题,并进行系统的分析和探讨。     

地方大学生在消防部队建设中的地位和作用

“科技强警”是“科技兴消防”的必由之路。地方大学生到消防部队,改善了消防干部队伍的文化结构,推进了消防部队队伍建设的现代化进程。要摸索地方大学生的成长规律,使之成为合格的警官、复合型的指挥人才,以便为消防部队建设服务。     

基于数字鉴频器的内燃机瞬时转速延时测量法

将基于数字鉴频器的延时法用于内燃机瞬时转速测量.首先介绍了延时法解调电路原理,然后使用仿真手段对延时法测量的特点进行了研究.仿真结果表明,该方法能够较好地还原频率调制信号,最后经实测试验证明了测量的有效性.该方法可采用全硬件电路实现,测量设备简单,可抑制调幅因素的影响,是一种有效的瞬时转速测试方法.     

星载寄生式SAR系统频率同步分析

针对星载寄生式SAR系统对地观测应用背景,详细分析了频率同步误差对双站SAR成像的影响,以法国提出的“干涉车轮”构形为例,对同步误差进行了仿真。提出了一种新的频率同步方法,该方法通过接收主星的直达波信号并进行相关处理,从而得到频率同步误差。计算机仿真结果表明该同步方法的准确性和有效性。     

An efficient and modular modeling for launch dynamics of tubed rockets on a moving launcher

This paper develops a modular modeling and efficient formulation of launch dynamics with marching fire (LDMF) using a mixed formulation of the transfer matrix method for multibody systems (MSTMM) and Newton-Euler formulation. Taking a ground-borne multiple launch rocket systems (MLRS), the focus is on the launching subsystem comprising the rocket, flexible tube, and tube tail. The launching subsystem is treated as a coupled rigid-flexible multibody system, where the rocket and tube tail are treated as rigid bodies while the flexible tube as a beam with large motion. Firstly, the tube and tube tail can be elegantly handled by the MSTMM, a computationally efficient order-N formulation. Then, the equation of motion of the in-bore rocket with relative kinematics w.r.t. the tube using the Newton-Euler method is derived. Finally, the rocket, tube, and tube tail dynamics are coupled, yielding the equation of motion of the launching subsystem that can be regarded as a building block and further integrated with other subsystems. The deduced dynamics equation of the launching subsystem is not limited to ground-borne MLRS but also fits for tanks, self-propelled artilleries, and other air-borne and naval-borne weapons undergoing large motion. Numerical simulation results of LDMF are given and partially verified by the experiment.     

Influence of porosity distribution on nonlinear free vibration and transient responses of porous functionally graded skew plates

This article deals with the investigation of the effects of porosity distributions on nonlinear free vibration and transient analysis of porous functionally graded skew (PFGS) plates. The effective material properties of the PFGS plates are obtained from the modified power-law equations in which gradation varies through the thickness of the PFGS plate. A nonlinear finite element (FE) formulation for the overall PFGS plate is derived by adopting first-order shear deformation theory (FSDT) in conjunction with von Karman’s nonlinear strain displacement relations. The governing equations of the PFGS plate are derived using the principle of virtual work. The direct iterative method and Newmark’s integration technique are espoused to solve nonlinear mathematical relations. The influences of the porosity distributions and porosity parameter indices on the nonlinear frequency responses of the PFGS plate for different skew angles are studied in various parameters. The effects of volume fraction grading index and skew angle on the plate’s nonlinear dynamic responses for various porosity distributions are illustrated in detail.