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本文介绍了0.01GHz~18GHz宽带同轴小功率传递标准及其控制软件。该功率传递标准达到了国外进口同类传递标准的先进技术水平,既可用作我院同轴小功率传递标准,亦可用于装备省(市)计量部门或国防科工委、各部委的一、二级电子计量站(所),满足国内外商品同轴小功率微小功率量值传递需求,可用于校准(1.5~4)%的各种商品小功率座。 相似文献
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对基于柔性基础的双层隔振系统的功率流传递特性进行了分析,利用有限元分析软件ANSYS计算了传递到基础的功率流,并用概率灵敏度分析方法研究了功率流对隔振系统给定参数的灵敏度,为双层隔振系统的优化设计奠定了基础. 相似文献
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结构振动传递的实质是振动能量的传递过程。功率流方法从能量的角度揭示振动传递的机理,在结构振动控制领域的作用日益突出。采用基于诺顿等效系统的方法计算功率流,具有便于与有限元分析和实验测量相结合的优点,为评价复杂实际结构的振动特性提供一条有效途径。应用该方法对一隔振系统的多维振动传递特性进行研究,通过分析多维振动形式各自传递的振动功率流,发现接受结构的柔性是振动传递的主要影响因素之一。对接受结构分别采用增加板厚和加筋两种方式进行改进,加筋方式取得了更好的减振效果,并且有利于结构的轻量化。 相似文献
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本文介绍了0.01GHz~18GHz宽带同轴小功率传递标准及其控制软件.该功率传递标准达到了国外进口同类传递标准的先进技术水平,既可用作我院同轴小功率传递标准,亦可用于装备省(市)计量部门或国防科工委、各部委的一、二级电子计量站(所),满足国内外商品同轴小功率微小功率量值传递需求,可用于校准(1.5~4)%的各种商品小功率座. 相似文献
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本文介绍了 0 0 1GHz~ 18GHz宽带同轴小功率传递标准及其控制软件。该功率传递标准达到了国外进口同类传递标准的先进技术水平 ,既可用作我院同轴小功率传递标准 ,亦可用于装备省 (市 )计量部门或国防科工委、各部委的一、二级电子计量站 (所 ) ,满足国内外商品同轴小功率微小功率量值传递需求 ,可用于校准 (1 5~ 4 ) %的各种商品小功率座。 相似文献
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本文研究用8098单片机对密闭大贮槽的贮液容量进行自动检测的应用系统,解决了把贮槽液位测量传感器输出的电流信号直接转换成贮液重量进行显示,从而使显示直观、清晰. 相似文献
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Peng Funan 《中国工程科学》2008,10(2):9-18
The success of the prediction of Haicheng earthquake and the failure of the prediction of Tangshan earthquake were both well known in the world. What happened, why such a strong earthquake as occurred in Haicheng had been predicted successfully and with a small loss of lives and property? Why a successively strong earthquake about a year later in a region not so further was failure in the imminent stage of prediction and there were so many fatalities and a great degree of property? The author addresses these points based on these true experiences including the first hand experiences leading up to, during, and following these two earthquarter. In addition, he also introduced some seimic phenomena which he had seen after Chichi earthquake in Taiwan. 相似文献
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The results of experiments in sublimation of cobalt in the neighborhood of the Curie point are analyzed. The kinetics of sublimation are described under conditions of permanent evacuation of the gas phase of cobalt. A magnetic model is suggested, which makes it possible to derive a quantitatively correct correlation between the Curie point and exchange splitting for Ni and Co. The contribution of magnetic interactions to the energy of sublimation of monatomic magnetic is calculated. 相似文献
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We propose a method and an automated installation aimed at the determination of the temperature dependences of the characteristics of elasticity and internal friction of metallic materials. In the course of the tests, the results of measurements of the temperature of the specimen, its resonance frequency, and the amplitude of vibrations at a given temperature are recorded in a computer. The moduli of elasticity and the characteristics of internal friction of the metal are computed at each given temperature by using the proposed relations. By analyzing the results of testing 012Kh18N10T steel, it is shown that the proposed method gives unusual results. 相似文献
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通过实验检验表面活性剂对太安表面静电积累的降解效果,测定表面活性剂对太安基本性质的影响,分析比较对表面活性剂的优化选择。 相似文献
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V. N. Shlyannikov 《Strength of Materials》2006,38(3):248-260
We propose a method aimed at the evaluation of the amplitude of singularity and dimensionless angular distributions of the
second terms in the expansions of stresses, strains, and displacements in the plastic zone in the vicinity of the crack tip.
The method is based on the combination the Hutchinson-Rice-Rosengren-type analytic solution and a numerical solution obtained
by using a modified method of boundary layer. The presented results enable us to analyze the effects of constraints in broad
ranges of conditions of biaxial loading.
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Translated from Problemy Prochnosti, No. 3, pp. 43–59, May–June, 2006. 相似文献
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Erica Andreotti Chiara Brofferio Luca Foggetta Andrea Giuliani Benno MargesinClaudia Nones Marisa PedrettiClaudia Rusconi Chiara Salvioni Margherita Tenconi 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2012,664(1):161-170
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车辆传动系统线性弯扭耦合振动响应灵敏度研究 总被引:1,自引:0,他引:1
由于车辆上采用的发动机工作转速较宽,无法完全避免共振现象的发生。针对上述问题对车辆传动系统动态特性的分析从固有特性的分析转移到动力响应的分析上来,并衍生出基于动力响应的灵敏度分析。以某车辆传动系统作为研究对象,建立了线性弯扭耦合集中参数动力学模型及方程。应用直接求导法建立了灵敏度方程,进行了响应灵敏度计算,分别研究设计参数对扭转方向的力矩和弯曲方向上力的影响,获得了轴段附加扭转力矩和轴承支反力对设计参数的灵敏度,并将同一灵敏度量在纯扭和弯扭系统下的结果进行对比。研究表明:弯扭模型计算出的响应灵敏度值比纯扭模型的计算结果小10%~20%,但规律趋于一致;弯曲方向上的力和扭转方向上的力矩对设计参数的灵敏度与该位置的振动能量大小相关,能量越大其对同一参数的灵敏度也越大。 相似文献