均布载荷作用下三边简支一边固定厚矩形板的弯曲

在本文中，功的互等定理法(RTM)被推广应用于求解基于Reissner理论的厚矩形板的弯曲问题，给出了三边简支一边固定厚矩形板在均布载荷作用下弯曲的精确解析解，并分析了解的数值结果。     

电视导引头图像闪烁故障分析

针对电视导引头存在的“图像闪烁”故障，重点分析了故障的常发生部位，如硅靶管、CCD、图像处理电路和电视摄像机光圈等，并从故障部位的结构特点和工作原理入手，详细阐述了故障产生的原因、机理以及排故方法，为同类故障的修理提供参考。     

挤压式无扩口导管密封性能改进研究

针对某型飞机在使用过程中出现的气动系统严重漏气、液压系统低压渗油等问题,对导管加工工艺、鉴定试验及装配工艺进行改进与优化,降低了导管故障率,提高了装备使用可靠性。     

冲击波对工程结构及装备的动载试验研究

获得国家科学技术进步一等奖的“1485抗爆激波管”是用来模拟爆炸冲击波的室内试验设备，其驱动段是以燃烧火药为能源，锥管前面管体内径是348mm，锥管后面试验段及其出口段内径为1485mm。试验段内部超压可达0．05～1．20MPa。地上试验段参试物安装在管内。地下试验段是内径2．50m、高3．00m的箱体，内部可进行地下结构模型试验。驱动段膜片夹紧力是由8个油缸及其二级连杆增力机构来完成。有长江三峡大坝动力响应试验、地下隧道试验、地形对冲击波影响试验及人防工事试验等已做过的部分典型试验。     

Constant power H∞ stabilization control strategy on airborne pump supplying system

以机载泵源系统的恒功率控制为目标，针对作业任务中系统负载随时间变化的情况，采用使液压系统输出功率保持恒定的控制方式来达到充分利用发动机功率的目的，对于机载泵源控制系统的主要被控对象——轴向柱塞式变量泵，建立了其状态方程和流量输出方程，采用H。鲁棒镇定控制策略实时调节泵的排量，仿真结果表明：当负载变化时，系统能根据压力的变化快速转换到恒功率工作曲线下对应的流量状态，所设计的H。控制器能够减小干扰和模型参数不确定对系统稳定性的影响，具有良好的鲁棒性，表明该方法用于机载液压系统可以改善系统工作性能，提高系统功率的利用率。     

卫星变轨对航天扫描式TDICCD相机系统参数的影响

文章主要介绍和分析卫星变轨对TDICCD相机系统的MTF、扫描周期的影响，最后分析卫星变轨对卫星覆盖范围的影响。     

Temperature effect on buckling properties of ultra-thin-walled lenticular collapsible composite tube subjected to axial compression

This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube(LCCT) subjected to axial compression.The buckling tests of the LCCT specimens subjected to axial compression were carried out on INSTRON-500 N servo-hydraulic machine in dry state and at the temperatures of 25 C, 100 C and 80 C. The load–displacement curves and buckling initiation loads were measured and the buckling initiation mechanism was discussed from experimental observations. Experiments show that the buckling initiation load, on average, is only about 2.2% greater at the low temperature of 80 C than at the room temperature of 25 C due to the material hardening, demonstrating an insignificant increase in the buckling initiation load, whereas it is about 19.5% lower at the high temperature of 100 C than at the room temperature owing to the material softening, implying a significant decrease in the buckling initiation load. The failure mode of the LCCT in axial compression tests at three different temperatures can be reckoned to be characteristic of the buckling initiation and propagation around the central region until rupture. The finite element(FE) model is presented to simulate the buckling initiation mechanism based on the eigenvalue-based methodology. Good correlation between experimental and numerical results is achieved.     

Toward an Understanding of the Systematic Uncertainties in Deriving the Primordial Helium Abundance from H II Region Observations

Recent determinations of the primordial He abundance have given significantly different results. We are attempting to identify some of the causes of these differences and propose observational solutions. Here we identify a systematic difference in how the data are interpreted (differences in corrections for the presence of neutral helium) and the importance of a systematic bias towards lower derived helium abundances (underestimating the presence of underlying stellar absorption).     

等半宽高矩形盒零件的超塑性胀形力学解析

本文在粘塑性本构方程基础上，对半宽与高相等的矩形盒零件进行了超塑性胀形力学解析，对变形危险点的应变速率加以最优控制，以使材料厚度分布相对均匀，并提高了形成极限。     

气膜冷却孔几何结构对流量系数的影响

为了研究火焰筒壁面气膜冷却孔几何结构对流量系数的影响规律，设计了几种具有不同几何尺寸和排列结陶的气膜冷却孔实验件。对气膜冷却孔的流量系数进行了实验研究。实验结果表明．在吹风比较小时．随吹风比的增加流量系数大幅度增加．当吹风比较大时，随吹风比的增加流量系数增幅减小。同时．在气膜孔厚径比大于1时，气膜孔的排列形式对流量系数的影响不大，当厚径比小于1时．叉排气膜孔的流量系数要高于顺排气膜孔的流量系数。