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排序方式: 共有67条查询结果,搜索用时 15 毫秒
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利用材料试验机(MTS)实验研究了复合材料面板、闭孔泡沫铝芯层夹芯板结构在准静态压入时的变形和破坏特征。实验结果表明,夹芯板的破坏主要集中在压头作用的局部区域内;同时,根据最小势能原理建立了泡沫铝夹芯板在半球形压头作用下的压入力学响应理论预测模型。通过引入无量纲参数分析了夹芯板压入载荷-位移响应,并在不同面板厚度、芯层厚度和芯层相对密度情况下,对夹芯板压入响应理论解的有效性和适用性进行了讨论。 相似文献
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<正>A new coupled integrable dispersionless equation is presented by considering a spectral problem.A Darboux transformation for the resulting coupled integrable dispersionless equation is constructed with the help of spectral problems.As an application,the N-soliton solution of the coupled integrable dispersionless equation is explicitly given. 相似文献
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Three important nonlinear evolution equations are solved with the aid of the symbolic manipulation system.Maple,using the direct algebraic method proposed recently,We explicitly obtain several new solutions of physical interest in addition to rederiving all the known solutions. 相似文献
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两个非线性方程的准确解 总被引:3,自引:0,他引:3
借助于计算机代数系统Mathematica利用直接代数方法获得了两个有数学物理意义的非线性耗散-色散方程的准确解,这种方法也适用于高维非线性方程。 相似文献
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Adomian decomposition method and Padé approximants for solving the Blaszak--Marciniak lattice 下载免费PDF全文
The Adomian decomposition method (ADM) and Pade approximants are combined to solve the well-known Blaszak-Marciniak lattice, which has rich mathematical structures and many important applications in physics and mathematics. In some cases, the truncated series solution of ADM is adequate only in a small region when the exact solution is not reached. To overcome the drawback, the Pade approximants, which have the advantage in turning the polynomials approximation into a rational function, are applied to the series solution to improve the accuracy and enlarge the convergence domain. By using the ADM-Pade technique, the soliton solutions of the Blaszak-Marciniak lattice are constructed with better accuracy and better convergence than by using the ADM alone. Numerical and figurative illustrations show that it is a promising tool for solving nonlinear problems. 相似文献
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A new method to protect the copyright of digital museum based on digital holography is proposed. The Fresnel hologram of watermark image is embedded in the object to be protected through discrete wavelet transform (DWT). After the watermark detection, the copyright information appears in the reconstructed hologram. With the higher redundancy feature in the hologram, the proposed technique can actually survive several kinds of image processing. Experimental results prove that the presented method has good robustness in image protection. 相似文献
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在评估弹药在高原的爆炸威力时,需要考虑高海拔条件对炸药爆炸冲击波参数的影响。为研究高海拔低气压条件下的冲击波传播规律,开展了模拟海拔高度h=500, 2 500, 4 500 m等3种气压条件下的爆炸冲击波测试实验。结果表明,当环境气压每下降20%时,冲击波超压、比冲量和到达时间平均降低约9%、10%和6%。将使用Sachs因子修正后的计算结果与测试数据进行对比分析,发现该方法能较好地预测不同环境条件下的爆炸冲击波参数。进一步分析了环境温度的影响,发现初始温度升高会使到达时间提前,本文实验的温度条件对超压和比冲量的影响并不显著。该研究结果对战斗部在高海拔的爆炸威力评估具有参考意义。 相似文献
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A connection between the(G'/G)-expansion method and the truncated Painlevé expansion method and its application to the mKdV equation 下载免费PDF全文
Recently the(G’/G)-expansion method was proposed to find the traveling wave solutions of nonlinear evolution equations.This paper shows that the(G’/G)-expansion method is a special form of the truncated Painlev’e expansion method by introducing an intermediate expansion method.Then the generalized(G’/G)-(G/G’) expansion method is naturally derived from the standpoint of the nonstandard truncated Painlev’e expansion.The application of the generalized method to the mKdV equation shows that it extends the range of exact solutions obtained by using the(G’/G)-expansion method. 相似文献