动态液-液旋流分离器油滴运动轨迹模拟

针对动态液-液旋流分离器油、水两相过程,从流体力学基本方程出发,采用雷诺应力模型、QUICK差分格式和SIMPLE算法模拟分析动态液-液旋流分离器内的流场;并以此为基础,采用离散相模型和多相流模型,模拟油、水两相分离过程和油滴运动轨迹.模拟结果表明:油滴粒径决定其在旋流分离器中的运动轨迹、速度及分离特性,大粒径油滴更易于向中心聚集形成油芯,油芯的形状与油滴的大小直接相关;动态液-液旋流分离器的主要分离过程在转筒内完成,油相分离效率随着油滴粒径的增大而提高.     

不同导引模式下的末修弹脉冲参数优化研究

在总脉冲量确定的情形下,在启控时间、总脉冲数、最小点火时间间隔及点火阈值等脉冲参数对末修弹落点散布的影响进行详细分析的基础上,利用数值仿真的方法,对比例导引模式、抛物线导引模式、落点预测导引模式、弹道追踪导引模式和zx导引模式等常用导引模式下的脉冲参数优化进行深入分析研究．     

当前城中村消防安全问题分析及对策探讨

随着城镇化的快速发展,“城中村”火灾多发,形势严峻.对现阶段“城中村”的火灾特点进行了分析,结合工作实际,提出并分析了“城中村”存在的消防安全问题,就如何提升“城中村”抗御火灾能力提出了防火对策.     

Effects of module number and firing condition on charge thermal safety in gun chamber

Thermal safety of modular charge which is fed into and retained in the chamber after gun fires consecutively is first investigated with cook-off method.A two-dimensional cook-off model of modular charge in gun chamber is established and the cook-off process of modular charge in gun chamber is numerically simulated.Then the effects of module number and firing condition on charge thermal safety are evaluated by researching the cook-off response characteristics of modules.The results show that,under conditions of different module numbers the cook-off responses all occur on the module closest to the boundary of missile,and the single-base propellants located at the inner surface of cartridge ignite first.When the number of loaded module changes from 1 to 6,the cook-off response temperatures vary little,only in a small range of 478.1 K-482.4 K.The cook-off response times decrease logarithmically in the range of 211.2 s-166.7 s with the increasing length of residual air gap in gun chamber.The simulation results are well matched with the experimental data.Furthermore,different firing conditions have great influence on the cook-off response time,minor influence on the initial response position and little in-fluence on the response temperature.Under the three conditions of consecutive 32 launches with 5 rounds/min,43 launches with 1 round/min,and 41 launches with different firing frequencies,the cook-off response temperatures are 479.2 K,481.1 K and 479.9 K respectively and the response times are 709.2 s,211.2 s and 214.4 s respectively.The response position is near the middle area of the inner cartridge surface in the former condition and near the right area in the latter two conditions.     

Establishment,simulation and verification of firepower safety control model

On a narrow warship platform, the coordinated use of shipborne weapon systems may cause firepower conflicts, which seriously endangers the ship safety. Meanwhile, with directed-energy weapons mounted on ships, firepower conflicts between weapons become a “high probability event”. Aiming at the problem of firepower safety control, based on the research about the collision probability model of air crafts and space targets and according to the cone of fire model of conventional weapons and directed-energy weapons, this paper solved the firepower conflict probabilities between conventional weapons as well as between conventional weapons and directed-energy weapons respectively using the methods of probability theory, and established the firepower safety control model. Then the calculation of firepower conflict probability was carried out using the dimensionality reduction method based on the equivalent conversion of polar coordinates and the power series method based on Laplace transform. The simulation results revealed that the proposed model and calculation methods are effective and reliable, which can provide theoretical basis and technical support for resolution of firepower conflicts between weapons.     

基于装备损伤概率的舰艇动力系统安全性分析

考虑舰艇损害管制过程中人员因素对系统的影响,运用马尔科夫链对人员操作引起的舰艇动力系统损伤概率进行修正,根据修正后的毁伤概率,建立概率危险性评估模型,引入危险度指标,对动力系统在遭受武器攻击情况下的危险度进行了计算,并依据计算结果对系统安全度进行评定。     

舰船拖带安全评估的故障树方法

提出了一种从故障树分析的角度进行舰船拖带安全评估的方法。采用专家评估和模糊集理论相结合的原理得到故障树中基本事件发生的模糊概率,然后进行故障树定性和定量分析。该方法能合理和有效地预测作业系统的安全性及其薄弱环节。以断缆事件分析为例,对该安全评估方法做了概要阐述。     

火灾安全评价方法研究

火灾安全评价是利用系统工程的方法对拟建或已有工程、系统可能存在的危险性及可能产生的后果进行综合评价和预测,并根据可能导致的火灾事故风险的大小,提出相应的安全对策措施,以达到工程、系统安全的过程。主要论述了火灾安全评价的目的、火灾安全评价的意义、火灾安全评价的一般程序、火灾安全评价方法选择、火灾安全评价方法的比较及火灾安全评价方法在消防中应用。     

论城市公共安全管理网络平台的建设

针对城市的快速发展,各种突发性自然灾害或人为破坏事件增多,在充分分析城市公共安全管理现状的基础上,提出了城市公共安全管理网络平台建设,并对其总体结构,各自功能,技术、政策支持及运行模式进行了深入论述。     

不同时间信息条件下多目轨迹交会测量点目标运动的方法

针对多相机对点目标的运动轨迹测量,提出不同时间信息条件下的多目轨迹交会法。对点目标运动轨迹进行时间多项式参数化描述,再将多个相机观察目标的系列视线与目标的参数化运动轨迹进行交会,通过最小化物方残差,确定出目标的运动轨迹。相对于传统的多目交会测量模式,本方法不仅能够有效地提高测量精度,而且能够在多相机之间观测不同步,或者时间未对准,甚至无时间信息的情况下仍得到目标的运动轨迹参数。相对于单相机测量模式时要求相机必须运动,多目情况下不要求相机自身运动。仿真实验和真实实验验证了该方法的有效性和高精度。