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WAN Zhan-hong SUN Zhi-lin YOU Zhen-jiang 《浙江大学学报(A卷英文版)》2007,8(9):1435-1442
The linear stability of fiber suspensions between two concentric cylinders rotating independently is studied. The modified stability equation is obtained based on the fiber orientation model and Hinch-Leal closure approximation. The primary instabilities and bicritical curves have been calculated numerically. The critical Reynolds number,wavenumber and wave speeds of fiber suspensions as functions of the aspect ratio,volume concentration of the fibers and the gap width of cylinders are obtained. 相似文献
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张鉴 《黄冈职业技术学院学报》2007,9(4):21-25
本文应用超磁致伸缩材料(GMM)构建FBG的电流传感探头,与ASE光源谱特性解调系统共同组成了交流电流测量系统,对50Hz的交流电流进行测量,并通过温度解调传感实验先对ASE光源谱特性解调进行了定标。通过实验标定ASE光源谱特性解调应变灵敏度系数,最终将交流电流形成的布拉格波长漂移量解调成交变的电压信号输出。该信号与输入电流信号相对应,并且包含了输入电流信号的幅值、频率和相位信息。从示波器测得的输入和输出信号的相似性表明,实验结果与理论分析是一致的,验证了ASE光源谱特性动态解调方法的可行性。 相似文献
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Approach for analyzing the ultimate strength of concrete filled steel tubular arch bridges with stiffening girder 总被引：2，自引：0，他引：2
ZHANG Zhi-cheng XIE Xu ZHANG He CHEN Heng-zhi 《浙江大学学报(A卷英文版)》2007,8(5):682-692
A convenient approach is proposed for analyzing the ultimate load carrying capacity of concrete filled steel tubular (CFST) arch bridge with stiffening girders. A fiber model beam element is specially used to simulate the stiffening girder and CFST arch rib. The geometric nonlinearity, material nonlinearity, influence of the construction process and the contribution of prestressing reinforcement are all taken into consideration. The accuracy of this method is validated by comparing its results with experimental results. Finally, the ultimate strength of an abnormal CFST arch bridge with stiffening girders is investigated and the effect of construction method is discussed. It is concluded that the construction process has little effect on the ultimate strength of the bridge. 相似文献
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INTRODUCTIONModelingfiber fiberinteractionsinnon di lutefibersuspensionsanddescribinghowtheseinteractionsaffecttherheologicalpropertiesofthesuspensionsintheflowsarefundamentalandimportantinmulti phaseflowsresearch .Ulti matelywewouldliketobeabletodesignan… 相似文献
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An analysis of the instability in the Taylor-Couette flow of fiber suspensions with respect to the non-axisymmetric disturbances was performed. The constitutive model proposed by Ericksen was used to represent the role of fiber additives on the stress tensor. The generalized eigenvalue equation governing the hydrodynamic stability of the system was solved using a direct numerical procedure. The results showed that the fiber additives can suppress the instability of the flow. At the same time, the non-axisymmetric disturbance is the preferred mode that makes the fiber suspensions unstable when the ratio of the angular velocity of the outer cylinder to that of the inner cylinder is a large negative number. 相似文献
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分析光纤光栅传感机理,阐述可调光纤F-P滤波器的工作机理和特点,并基于单片机AT89C52实现光纤光栅解调系统。 相似文献
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普通光学显微镜只能传递光波的振幅信息而丢失相位信息,因此用普通光学显微镜对透明和半透明的物体观察会丢失一些特征信息。植物纤维基本介于透明体与半透明体的状态,而透明物体对光只产生相位的移动而不能显著地改变光的振幅,所以在普通光学显微镜中难以观察到棉麻纤维的局部细节特征信息。而微分干涉相衬显微镜所观察的物体是位相物体,因此应用微分干涉显微镜可以明显改善这种情况。 相似文献