化工企业使用丙酮过程中火灾危险性研究

以某使用丙酮危化品企业为例,分析计算丙酮在使用过程中发生火灾爆炸事故的可能性及后果严重性,重点针对反应釜失控后果危险性、蒸气云爆炸后果危险性进行定量分析,并针对定量分析结果提出了相应的消防安全控制措施。     

加筋板架抗动能穿甲的等效防护厚度研究

为研究舰船舷侧结构抗穿甲性能,采用有限元分析了两种典型工况下板架的穿甲破坏模式、弹体的剩余速度和板架的变形吸能规律,提出了基于剪切冲塞模式的剩余速度理论计算模型,比较了不同等效计算方法得到的结果,并将理论计算结果分别与相关文献的实验结果和本文的有限元计算结果进行了比较,两者之间均吻合较好。结果表明,加强筋对板架的抗穿甲性能影响较大,而板架的实际等效厚度是决定其抗穿甲性能的主要因素;不同的等效计算方法与模型相对尺寸、弹体冲击速度以及命中位置有关,对于弹体直径相对较大且初始冲击速度较高时,不同的等效计算方法得到的结果基本一致。     

空气动力和直接侧向力复合控制的拦截弹飞行力学及稳定回路模型

以大气层低层拦截导弹为研究对象,建立了飞行力学模型,进行了空气动力与力矩燃气动力的复合控制回路分析设计,进行了实例计算与仿真。     

The Early Responses of Air-backed plate subjected to underwater explosion with aluminized explosives

This work aims to research the effects on the early responses of the air-backed plate subjected to the loading generated by the underwater explosion with aluminized explosives. The loading characteristics of underwater explosion for ideal explosive (TNT), aluminized explosives (RS211 and RBUL) are obtained experimentally. The tested aluminized explosives have different energy output compared with TNT. Based on the Taylor plate theory, the early responses of the air-backed steel plate affected by the measured loading is analyzed. The analytical results indicate that the pressure curve of the shock wave within 1 time decay constant is the main factor affecting the kick-off velocity of the plate when cavitation occurring. The velocity responses of the plate produced by the loading of RS211 and RBUL are obviously different with that of an equivalent TNT charge, which also indicates validity and suitability should be noticed in the case of substituting TNT for aluminized explosives. Moreover, the uncertainties in the responses of the plate produced by RS211 and RBUL are much larger than TNT.     

谈谈飞行力学的三大研究手段

基于现代力学思想、信息时代高新技术和以往工作经验 ,对飞行力学的三大研究手段 ,即理论、计算和实验 ,进行了比较详细的讨论。     

爆炸分散液体前锋形态的分形维数分析

应用高速摄像仪对液体的爆炸分散实验过程进行了拍摄,得到了液体爆炸分散过程的时间序列。通过对爆炸分散过程中液体前锋分形维数的分析,得到了爆炸分散过程中爆炸分散液体前锋边界曲线具有典型的自相似特性。     

聚合过程火险分析与评价

应用道化学公司的火灾爆炸危险指数评价方法 (第七版 ) ,针对燕山石化有限公司 18万吨 /年釜式法高压聚乙烯生产工艺的特点 ,分析和评价聚合过程的火灾危险性 ,并提出实用性的防火防爆措施     

处理好工程力学与大学物理内容衔接的问题

大学物理课和工程力学课是学院2门重要课程。分析了2课衔接存在的问题,提出优化课程内容的方法:祥解、略讲、删减、增加。     

Experimental investigation on dynamic response and damage models of circular RC columns subjected to underwater explosions

Reinforced concrete (RC) columns are widely used as supporting structures for high-piled wharfs. The study of damage model of a RC column due to underwater explosion is a critical issue to assess the wharf’s antiknock security. In this study, the dynamic response and damage model of circular RC columns subjected to underwater explosions were investigated by means of scaled-down experiment models. Experiments were carried out in a 10.0 m diameter tank with the water depth of 2.25 m, under different explosive quantities (0.025 kg–1.6 kg), stand-off distances (0.0 m–7.0 m), and detonation depths (0.25 m–2.0 m). The shock wave load and dynamic response of experiment models were measured by configuring sensors of pressure, acceleration, strain, and displacement. Then, the load distribution characteristics, time history of test data, and damage models related to present conditions were obtained and discussed. Three damage models, including bending failure, bending-shear failure and punching failure, were identified. In addition, the experience model of shock wave loads on the surface of a RC column was proposed for engineering application.     

基于状态约减的信息攻防图生成算法

针对攻防图构建中存在的状态爆炸问题,提出一种基于状态约减的攻防图生成算法。该算法在分析攻击者和目标网络特点的基础上,对独立状态节点的权限进行对比;其在保留最高权限节点的前提下,实现对低权限节点的约减,并去除冗余攻击路径。仿真实验表明算法具有计算复杂度低、能有效降低状态爆炸以及控制攻防图规模等优点。