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简要阐述了等离子体技术的发展现状,分析了等离子体对电磁波吸收、散射机理和特性,介绍了等离子体技术的具体应用情况和发展趋势,并就等离子体技术在水面舰艇隐身领域的应用进行了初步探讨. 相似文献
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本文就电磁波在等离子体中的传播衰减进行了理论分析,为低温等离子体在军事装备上的应用提供了一定的理论说明。 相似文献
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舰船隐身技术及舰船等离子体隐身技术浅谈 总被引:2,自引:0,他引:2
舰船隐身性是世界各国普遍关注的大问题。本文在各种舰船隐身技术和等离子体隐身技术的基础上提出了舰船等离子体隐身的新设想。并对它们的优缺点和改进方法作简要介绍。等离子体隐身技术是一种新概念、新原理的隐身技术。是一种反雷达探测的新技术。其核心是电磁波与等离子体的相互作用。在军事和空间技术领域上具有很高的学术价值和应用价值。本文还对等离子体隐身技术作简要介绍来说明等离子舰船隐身的可行性。[编者按] 相似文献
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等离子体净化有机臭味气体研究 总被引:1,自引:0,他引:1
研究清除空气中的甲硫醇,在环保领域有积极的意义。本文采用等离子体作为氧化活化手段开展了等离子体对空气中甲硫醇的净化研究。考察了甲硫醇浓度、湿度、空速变化对等离子体净化甲硫醇脱除效果的影响。实验结果表明:等离子体法能够高效脱除空气中的甲硫醇。水不参加等离子体氧化反应,空气中甲硫醇浓度的增加和空气气速的增加会降低净化的效率。 相似文献
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激光等离子体发射光谱的测试与分析 总被引:1,自引:0,他引:1
利用自制装置对激光产生的等离子体发射光谱进行了测试,研究了不同激光能量下的复合谱的一维强度分布,实验结果表明随着激光能量的提高,等离子体发射强度及最大膨胀距离也相应增加.同时研究了激发态Al原子的特征谱线的飞行谱,并计算出激发态Al原子的飞行速度为2×103m/s. 相似文献
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舰船RCS是海上雷达系统探测回波强度的一个重要物理量,受多种因素影响,会呈现不规律的随机起伏。论文主要研究了粗糙海面的起伏特性、不同频率、不同极化方式以及不同入射方向的雷达入射电磁波对舰船RCS特性测量的影响,给出了粗糙海面的统计模型,运用时域有限差分法(FDTD)对舰船的RCS进行了计算仿真,研究结果为海面雷达的侦测提供了理论参考依据。 相似文献
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加筋板结构声传输研究 总被引:2,自引:0,他引:2
采用有限元法和Rayleigh积分建立了空气中嵌在无限大刚性障板上加筋板结构在简谐平面声波斜入射情况下的声传输计算模型。并研究分析了加筋板结构的板厚、肋骨惯性矩和间距、边界条件、板材和平面声波入射角度等对结构传声损失的影响以及平面声波入射角度与隔声低谷的关系。得到了一些有意义的结论。从而为揭示加筋板结构声传输特性,改善结构的隔声性能提供了一定的依据。 相似文献
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考虑风、浪、流的联合作用以及平台护舷非线性恢复刚度,研究船舶系泊状态与平台的撞击力及其分布规律。针对不同的风、浪、流的作用方向以及不同的风速、波高及流速,计算波浪和海流的载荷,建立系泊船舶的分析模型,采用频域与时域分析方法,进行系泊船舶运动及其与平台之间碰撞力的仿真,得到系泊船舶与平台的碰撞力时间历程,并分析不同碰撞力发生的概率,确定发生最大碰撞力的风、浪、流方向,比较常量护舷刚度与非线性护舷刚度的计算结果。结果表明,橡胶护舷刚度的选取对于碰撞力的计算结果影响显著,选取非线性护舷刚度计算靠泊碰撞力十分必要,用目前的经验公式计算得到的碰撞力偏差较大。 相似文献
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随着移动终端的发展,内置天线要求小型化,低剖面,能工作在不同频段下。文中提出了一种新颖平面双频手机PIFA(planarinvertedFantenna)天线。采用弯折路径,开槽缝隙加载的方法设计的双频PIFA天线。天线的工作频段覆盖了EGSM900(880MHz--960MHz),DCS1800(1710MHz-1880MHz)的所有频率,工作性能良好。该天线结构易于实现,便于内置集成,适用于移动通信终端。 相似文献
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水下等离子体声源聚焦性能仿真及误差分析(英文) 总被引:2,自引:0,他引:2
Focused underwater plasma sound sources are being applied in more and more fields. Focusing performance is one of the most important factors determining transmission distance and peak values of the pulsed sound waves. The sound source’s components and focusing mechanism were all analyzed. A model was built in 3D Max and wave strength was measured on the simulation platform. Error analysis was fully integrated into the model so that effects on sound focusing performance of processing-errors and installation-errors could be studied. Based on what was practical, ways to limit the errors were proposed. The results of the error analysis should guide the design, machining, placement, debugging and application of underwater plasma sound sources. 相似文献
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Ship impact against offshore floating wind turbine (OFWT) has been identified as one of the major hazards with the development of OFWTs. The dynamic responses of OFWTs under ship impact should be taken into consideration during the design phase. This paper addresses a study on the dynamic responses of an OFWT in ship collision scenarios. Firstly, a mathematical model for external mechanism of ship-OFWT collision scenario is developed. Secondly, this model is combined with an in-house programme, DARwind, which can be used to predict nonlinear dynamic responses of whole OFWT system in time-domain. With the newly combined analysis tool, simulation cases for different scenarios are conducted to investigate the nonlinear dynamic responses of OFWT system, including the cases of still water condition, wave-only condition and wind-wave condition. It is shown that in still water condition, the ship impact will more obviously change the responses of motions and mooring system, compared with those in wave and wave-wind conditions. In the wave-only condition, these motions responses of platform are suppressed by wave effect, but the tower vibration and tower top deformation are sensitive to ship collision. For the wave-wind combined condition, the motions increment in surge and pitch due to ship collision becomes smaller than that of wave-only condition, but yaw motion has a considerable variation compared with those of the other two conditions. Additionally, the blade tip deformation increment due to ship collision are analyzed and it is found that the edgewise tip deformation got more obvious increment than that of flapwise. To further asses the safety of OFWT, the acceleration at nacelle are analyzed because some equipment might be sensitive to acceleration. The analysis results indicate that even though the OFWT structure doesn't get critical damage by ship impact, the equipment inside may still fail to work due to the high value of acceleration induced by ship impact. The research outcomes can benefit the safety design of OFWT in the engineering practice. 相似文献
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针对舰船特殊的天线安装环境,重点分析短波宽带天线在舰船上安装后,安装环境对其驻波和增益产生的影响,以及如何避免这些影响。 相似文献
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受波长限制,中波发射天线结构较大,要求的发信功率也较大,成为制约中波通信发展的关键技术.论文通过小型化中波发射天线技术的研究,重点关注功率容量、辐射效率和频带宽度三个指标,提出了几种新的小型化中波发射天线设计方案. 相似文献