New criterion for aircraft susceptibility to infrared guided missiles

This paper assesses aircraft susceptibility from the first principles, with respect to the threat posed by passively guided infrared homing missiles; with an objective of gaining insight into the comprehensiveness of the relationship between aircraft susceptibility and aircraft infrared signature level. The conventional criterion of aircraft susceptibility assessment based on its lock-on envelop is found to be inadequate, and a new criterion termed here as the Lethal Envelop is presented. The proposed susceptibility assessment criterion is more relevant for coming generation of infrared-guided missiles, because of advancements in the infrared detection technology. A threshold infrared signature level is also proposed as benchmark to be satisfied by all infrared signature suppression systems; if aircraft susceptibility to infrared guided missiles is to be reduced. This analysis is vital for gauging the effectiveness of infrared signature suppression systems. A typical air-to-air combat situation is simulated, and the results that lead to aircraft susceptibility assessment are obtained from this model, which illustrates the comprehensiveness of the redefined aircraft susceptibility assessment approach.     

高端CAD／CAM软件应用与开发的教学和教材建设研究

分析了高端CAD／CAM软件应用与开发对我国实施制造业信息化的重要作用,以及在建设机械制造及其自动化重点学科,培养高技术应用型人才过程中的重要性。提出了教学互动的创新教学模式与方法,制定了详细的实验操作规程及实验教学大纲。研究开发了CAD／CAM软件应用教材——高职高专系列教材《机械CAD／ CAM》。     

螺旋形纳米碳纤维的电磁波吸收特性分析

根据手征材料的本构方程,讨论了螺旋形手征纳米气相生长碳纤维(VGCF)手征参数ξ与电磁参数ε,μ的关系,并分析螺旋形VGCF几何结构产生的手征特性,与电磁波相互作用时产生电磁交叉极化的耦合吸收电磁波的机理,研究了改善手征材料ξ和性能的方法。结果表明,取螺旋形VGCF半径与螺距比为0.23左右,增加手征体含量可改善手征介质的手征参数,手征体的含量适当、螺旋形VGCF的尺寸与电磁波的波长接近能提高材料的吸波能力。     

直升机液弹阻尼器填充材料粘性特性分析

液弹阻尼器是现代直升机旋翼系统的关键部件,由于其突出的性能优势代表了阻尼器的发展方向。本文基于液弹阻尼器的工作原理,通过液弹阻尼器填充液的分析选择,进行液弹阻尼器填充材料特性研究。建立正确分析液弹阻尼器设计分析模型,充分考虑粘温性能、粘压性能的综合影响,揭示影响液弹阻尼器力学性能的参数敏感性,为新型液弹阻尼器的结构设计与计算综合分析提供支持。     

喷管复合材料扩张段的阵地超声探伤研究

研究了用超声干耦合单面检测方法对固体发动机喷管复合材料扩张段进行阵地探伤的可行性和判伤标准，探讨了方法对扩张段的探测能力及检测试验件的最佳检测工艺条件，并给出了实验结果。     

直升机复合材料结构试验与分析一致性技术的应用研究

本文主要进行了一致性评判技术在直升机复合材料结构试验与分析中的应用研究。对复合材料典型结构件,本文先进行了有限元建模及分析计算;然后进行了相应的强度试验并得出试验结果。通过对位移计算结果和试验结果的对比分析,本文对其进行了一致性模糊综合证券,从而验证了该评判方法的有效性。     

从10世纪以前的中日物质文化交流看落后文明对先进文明的学习

中日两国是一衣带水、隔海相望的近邻，有着两千多年的交往历史。在政治、经济、文化等诸多领域，两国人民始终有着密切的联系，特别是中国传统文化对日本本土文化的形成和发展产生了重大影响。本文通过在日本发现的大量中国文物，结合文献资料，从宏观上回顾了10世纪以前的中日物质文化交流。在此基础上，选取中国与日本发现的唐代铜镜为主要依据，在微观上对中日物质文化交流的实态、意义以及日本民族对待先进外来文化积极继承和发扬的态度进行思考、研究。     

复合材料固化监测新方法及在固体发动机缠绕成型中的应用

概述了复合材料现有的固化监测方法,着重论述了机械阻抗分析式和光纤传感式两种固化监测的新方法的工作原理,结构特点及在固体发动机壳体缠绕成型固化中的应用。     

Reduction of satellite electromagnetic scattering by carbon nanostructured multilayers

We propose a low observable satellite covered by layered materials. The dielectric properties of the composite materials are analyzed using the coaxial air-line method. Our solution could result in cost-effective applications for satellite stealthness. The particle swarm optimization algorithm is used to design and optimize layered absorbers. The obtained reflection is below −20 dB in many frequency subranges, also under an oblique incident condition, within the band 2–18 GHz. The optimized layered absorbers are used as a cloak for cube satellites. In particular, we investigated a very simple geometry by using a finite element commercial software in the band from 2 to 18. Finally, the transmission through an aperture on the satellite surface is analyzed. It is highlighted that the optimized layered absorbers attenuate the electric field within the satellite, improving its immunity against electromagnetic interferences.     

选择工程材料的一种定量化方法

本文简述了选择工程材料时应考虑的部分因素,论述了材料在某些载荷作用下其机械性能与成本之间的关系,从而给出了可以定量化比较和计算的选择工程材料的方法。