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水下航行体垂直发射过程气幕形态特性研究 总被引:1,自引:0,他引:1
采用VOF多相流混合模型和标准k-ε湍流模型对水下航行体气幕垂直发射过程中气幕形态特性进行了深入研究.研究了气幕的形态、长度和夹断点距离随马赫数的变化规律,与实验结果进行了对比分析,分析结果说明了本数值方法的正确性和可靠性.得到了气幕垂直发射过程中的气幕的长度和夹断点距离在Ma<1.1时随马赫增大逐渐增加, 而Ma≥1.1时,介于21~22之间的气幕夹断点距离随马赫数的增加而基本不再变化.获得的气幕形态轮廓随马赫数的增大而增大. 相似文献
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By analyzing the correlation between modal calculations and modal experiments of a typical support-er, an effeetive finite element analysis(FEA) model of the aetual aerospaee supporter is ereated. According to the analysis of eonstrained viseoelastic damping, the strategies of PVC have been worked out, and the correlation between modal ealculations and modal experiments of the supporter has also been eomputed, and then, an experiment has been designed based on the ealculation results. The results of experiments verify thai the PVCstrategy can effectively suppress vibration. 相似文献
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A new finite element modeling method has been developed using laminate theory in a virtual work principle for active constraining layer damping plate. The frequency dependent modulus of viscoelastic material is described by introducing a few dissipation coordinates, known as GHM (Golla-Hughes-McTavish) method, a standard linear system with constant coefficient. The effectiveness of this method is validated by experimental model. Compared with conventional methods, this method can reduce a number of degrees of freedom and improve accuracy, provides a good model for analogous configurations. 相似文献
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前言工程中常常遇到一些形状比较复杂的壳体,有的尽管厚度变化不大,但曲率变化很大,即局部厚度t 与曲率半径ρ之比变化很大。例如,我们与沈阳水泵研究所协作搞的引黄泵盖的应力分析,尽管是等厚度壳,但由于曲率变化很大,局部的t/ρ比可在1/2—1/10的范围内波动。在采用有限元法分析时,对这种厚度较大的壳体,不能采用薄壳单 相似文献
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Elastic wave imaging of two dimensional targets 总被引:3,自引:0,他引:3
0 INTRODUCTIONInversescatteringofelasticwavehasagreatpotentialtobeappliedtonondestructivetesting ,medicalimaging ,geologicalprospectingandmaterialscienceetc .,andvar iousinversescatteringmethods ,eachpossessingitsownpeculiarities ,havebeenproposed .In 1992 ,Mog… 相似文献