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Abstract: A large planar microphone array,which consists of 111 microphones,was successfully applied to obtain a two-dimensional mapping of the sound sources on a landing aircraft.The focus of study in this paper is on the landing gear noise source.The sp
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文摘:应用由111个传声器组成的平面传声器阵列对当前流行的民用客机进场着陆过程中的机体噪声源进行了实验测量，本文对七架窄体客机和七架宽体客机的起落架噪声进行了分析，得到了起落架噪声的频谱特性、指向特性和声级变化.研究发现，起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成，起落架噪声的指向性类似于一个水平放置的偶极子.不同飞机起落架噪声的声级相差较大，这说明可以通过重新结构设计降低起落架噪声。 |
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Abstract: A laser damage facilities,which has mm size spot and operates in TEM00 mode， were achieved.In order to know the reasons of laser damage,the laser energy density was controlled near the damage threshold of the oxide thin films.According to the ex
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文摘:采用毫米量级大光斑的近单模的激光器，控制入射薄膜表面的激光能量，获得了几种常见单层膜和增透膜的损伤形貌，实验结果表明，薄膜的损伤可区分为熔化型和应力型两种，薄膜表面等离子体对损伤斑点的扩大有重要作用。 |
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Abstract: A liquid level/temperature display alarming system consisting of transmitter, water column display alarming device, temperature sensing elements and temperature display device is introduced.
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文摘:介绍一种以变送器、液位光柱显示报警仪、热敏元件及温度数显仪组成的液位/温度测量显示报警系统。 |
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Abstract: A locking-based concurrency control scheme fo r object-oriented databases(OODBs) was presented.
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文摘:讨论面向对象数据库中的1种基于锁定的并发控制模式。 |
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Abstract: A mathematical model describing the effect of flow nonuniformityon the performance of compact heat exchanger is provided,which is based on that one side of heat exchanger is uniformly distributed but the other is of maldistribution.The model may
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文摘:以一侧流体分配不均匀的换热器模型为基础，建立了物流分配不均匀性对换热器效能影响的数学模型，通过理论分析和计算，为研究换热器内部物流分配不均匀对其效能的影响提供了一种分析方法.该理论模型包括连续模型和离散模型2种形式，前者为研究物流分配不均匀引起换热器效能的下降提供了一种分析计算方法，后者为控制实验研究的精度提供了理论依据.研究结论对换热器的优化设计具有重要意义. |
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Abstract: A mathematical model of electrical data calculation of coreless induction furnace is proposed and a useful method of measuring stray loss and electrical resistivity at high temperature of crucible is given.
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文摘:提出了一种无芯感应炉电参数计算的数学模型，给出了测量杂散损耗和坩埚高温电阻率的实用方法。 |
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Abstract: A mathematical model of the vibration at the upper segment of a pile when there exist severe defects is put forward based on theoretical analysis, and the curve characteristics of its low strain test is described according to engineering practic
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文摘:从理论上给出了当基桩存在浅部严重缺陷时，在受到瞬态激振力的情形下，桩体上段振动的数学模型，并结合工程实践，描述了其低应变实测曲线的特征。 |
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Abstract: A method by using 8031 single-clip microprocessor to get the syntonical bit information is presented,based on the characteristic of the modulated singal in ascending cosine envelope.The timer is locked at the maximum of the wave peak.The experim
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文摘:利用升余弦包络调制信号的特点，即基带信号为升余弦波，接收端可以利用这一包络，从中提取定时信息.提出了一种将时钟锁定到包络峰值最大点的单片机实现的方法，从而完成了在接收端正确提取定时信息的任务. |
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Abstract: A method is proposed in order to accelerate the convergence of artifcial neural network(ANN) modeling of chemical process,in which the principal components analysis is applied in the data processing in training sets.The result shows that the cor
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文摘:达到提出应用主成分分析法对样本进行预处理，减少网络的输入因子数，消除输入因子间的相关性并简化网络结构，达到提高网络学习速率的目的，得到的人工神经网络模型能达到所要求的精度。 |
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Abstract: A method is proposed in this paper to deduce the synthesized effectiveness of anti-jamming of a radar with comprehensive measures of anti-jamming from separated effectiveness of anti-jamming of several radars with different measures of anti-jamm
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文摘:提出了一种在外场雷达对抗试验中，由多部具有分抗干扰措施的雷达的抗干扰效果推出某种具有综合性抗干扰措施的雷达的合成抗干扰效果的方法，以在不具备该种雷达的情况下，用多部具有分抗干扰措施的雷达来代替它作为被干扰对象，在外场进行干扰机对其干扰的干扰效果试验检验。 |
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Abstract: A method is set forth to calculate the hydrodynamic pressure influence matrix of elastic dam using series development and linear superposition theorem in this paper.
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文摘:利用级数展开和线性叠加原理，本文给出了一种求取弹性坝面动水压力影响系数矩阵的数值算法。 |
