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无人机的发展是当前世界武器发展的重要方向之一,反辐射无人机作为一种重要的反辐射武器以其独特的优点得到了世界各国的关注,综述了未来空战中反辐射无人机的概况和特点,分析探讨了反辐射无人机的关键技术和应用前景。 相似文献
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介绍了无限大薄板中弯曲波的声辐射机理,推导了无限大薄板的辐射声压计算公式,得到了无限大薄板弯曲波结构声强与辐射声强的关系表达式,并给出实验测量和理论计算结果验证了理论的正确性,为进行结构声辐射研究提供了思路和方法。 相似文献
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本文简要介绍了测量船舶辐射增温试验的情况,分析了船体辐射对大气折射率的影响,讨论了船体辐射增温与时间,高度及风速的关系,给出了结论和建议。 相似文献
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为了确定温度传感器辐射修正校准的准确性,需要对温度传感器辐射修正校准结果进行对比及不确定度分析。本文介绍了在热校准风洞中进行温度传感器辐射修正校准的结果,并做了对比研究和不确定度分析。 相似文献
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飞机红外辐射特性飞行试验测量 总被引:1,自引:0,他引:1
概要介绍了为飞机红外辐射特征计算模型验证所进行的飞机红外辐射特性飞行试验测量,并对试验结果进行了简单的分析。另外,还对将来的试验改进计划提出了建议。 相似文献
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随着CCD成像技术日益成熟,CCD逐渐开始应用到高温温度场测量当中,并结合多光谱辐射测温技术,弥补了传统测量方法在测量高温温度场时的缺陷。本文概述了CCD的成像原理和多光谱辐射测温原理以及CCD多光谱测温技术在测量高温温度场的优点。通过分析相关资料,概述了彩色CCD和近红外CCD多光谱测温研究进展,对目前CCD多光谱测温技术研究发展进行了归纳。 相似文献
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The Electron Radiation Belt 总被引:4,自引:0,他引:4
Electron radiation belts can change dramatically in a few seconds or slowly over years. Important issues in understanding such changes are: (1) What is the source of electrons in the radiation belts? (2) How important is radial diffusion compared to other radial transport mechanisms? (3) What are the detailed changes in the magnetosphere that produce radial diffusion? (4) Why is the response of the electron radiation belt to changes in the solar wind different from that of substorms and of the ring current? (5) Are processes other than radial transport, such as wave-particle interactions, important in energizing electrons in the radiation belts? 相似文献
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浮空器太阳辐射模型研究 总被引:1,自引:0,他引:1
采用理论分析和试验测定相结合的办法,对浮空器太阳辐射进行了研究,建立太阳直射辐射模型、天空散射辐射模型和地面反射辐射模型,计算值与试验测定值吻合较好。 相似文献
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为了研究低功率氩电弧喷射推力器中的辐射损失,采用辐射模型和非辐射模型对其工作过程进行了对比数值模拟分析。采用二阶精度无波动、无自由参数的耗散差分格式(NND格式)数值求解耦合电磁源项和辐射源项的N-S方程组,并采用隐式残差光滑法加速收敛;采用有限控制容积积分方法离散求解椭圆型偏微分电磁场方程,并采用逐点超松弛迭代方法加快收敛速度。数值模拟结果对比给出了辐射模型和非辐射模型流动分布情况,并比较了两种模型推力器推力、比冲和推进效率。研究结果表明,与非辐射模型相比,辐射模型比冲低0.137%,推进效率低1.03%,辐射对低功率电弧喷射推力器性能影响比较小。 相似文献
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A simplified practical approach to determining the effects of weather on the transmission of radiation at visible, infrared (IR), and millimetre (mm) wavelengths, with particular reference to the aircraft landing problem, is outlined. Passive landing systems are studied. Landing categories related to visibility are defined. An extinction coefficient used to relate the effect of the atmosphere on the radiation detected by the human eye (or an imaging sensor onboard the aircraft) to the landing category and the calculation of this coefficient are discussed. The approach makes use of data from openly available literature. Results have been found useful in indicating the effects of adverse weather on imaging sensor performance for an enhanced vision aircraft-mounted landing system. As an example of the technique, the method of determining the extinction coefficients in fog for infrared radiation is outlined 相似文献
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The energy state of a planet depends fundamentally on its radiation budget. Measurements made from space over past decades
have led to significant revisions of ground-based estimates, both of the reflected fraction (the Bond albedo) of solar radiative
flux and of the emitted thermal infrared radiation flux, for the Earth as well as for the other planets. After a brief survey
of methods and difficulties in accurately determining planetary radiation budgets, we note contradictions in existing tabulations
of global parameters, in particular Bond albedo. For the Earth, such contradictions are unjustified, considering that global
and annual means as well as the seasonal cycle of Earth Radiation Budget components have now been determined with high accuracy.
The Earth's Bond albedo is close to 0.3. Net storage of energy in the Earth-ocean system is close to zero, with a well-established
annual cycle of amplitude close to ±12 Wm−2. Some contradictions remain for the other terrestrial planets. For the giant planets, modern reduced values of the Bond albedo
imply reduced but still significant internal energy generation. 相似文献
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In this technique, small blunt models are launched into a mixture of nitrogen and neon in a ballistic range, and the radiation from the shock layer on the forward face of the model is measured during the last few microseconds of flight by a radiometer directly in the flight path of the model. The ultraviolet radiation is sensed with the phosphor sodium salicylate. Comparison with other techniques and a brief summary of results are given. 相似文献
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