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连续体结构拓扑优化应力约束凝聚化的ICM方法 总被引:4,自引:2,他引:4
为克服应力约束下拓扑优化问题约束数目多、应力敏度计算量大的困难,提出
了应力约束化凝聚化的ICM方法. 在利用Mises强度理论将应力约束转换成应变能约束后,
提出了应力约束凝聚化的两条途径:其一为应力全局化的方法,其二为应力约束集成化的方
法. 由此建立了多工况下以重量为目标、以凝聚化应变能为约束的连续体结构优化模型,并
利用对偶理论对优化模型进行了求解. 4个数值算例表明:该方法具有较高的计算效率,得
到的拓扑结构比较合理,不仅适用于二维连续体结构,也适用于三维连续体结构. 相似文献
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The thermodynamic properties of 135 polychlorinated phenothiazines (PCPTZs) in the standard state are calculated using a combination of quantum mechanical computations performed with the Gaussian 03 program at the B3LYP/6-311G** level, and their octanol-water partition coefficients (logKow) are calculated based on group contributions. The chlorine substitution pattern strongly influenced the thermodynamic properties and hydrophilicity of the compounds. The thermodynamic properties of congeners also depend on the chlorine substitution pattern. The effect of chlorine substitution pattern is quantitatively studied by considering the number and position of Cl atom substitution (NPCS). The results show that the NPCS model may be used to predict the thermodynamic properties and hydrophilicity for all 135 PCPTZ congeners. 相似文献
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The capacity factors (k') of fourteen types of halogenated thiophenols in different phases of methanol-water eluent were determined by reversed phased high-performance liquid chromatography (RP-HPLC) and the relationships between the logarithm of capacity factor lgK' and methanol ratio ψ were analyzed. A fair linear relationship is found between lgK' and ψ, and the correlation coefficients R2 of the constructed linear equations are all greater than 0.990. Relationship between the chromatographic data lgKw' when extrapolated to pure water and n-octanol/water partition coefficient lgKow obtained by the group contribution method has shown a good linear correlation with R2 = 0.956. The structure parameters of fourteen halogenated thiophenols were calculated by using DFT, and the correlation equation of lgKw' and structure parameters was obtained by using SPSS, lgKw' = -0.409 + 0.039α and R2 = 0.981, meaning that lgKw' is mainly determined by the polarizability α. 相似文献
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约束多体系统动力学正则方程的约束变尺度方法 总被引:3,自引:0,他引:3
对约束多体系统动力学的正则方程建立了最优化问题模型,采用辛差分格式,提出相应的最优化问题的约束变尺度法,该方法有效地提高了计算稳定性,算例说明了方法的有效性。 相似文献
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