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将区间值模糊集和D[0,1]上的t-模(J)应用于格蕴涵代数的滤子理论,引入格蕴涵代数的区间值,(J)-模糊(关联、正关联)滤子的概念,给出了它们的等价刻画,研究了它们之间的关系. 相似文献
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By taking a hollow sphere as a representative volume element (RVE), the macroscopic strain potentials of porous materials with power-law incompressible matrix are studied in this paper. According to the principles of the minimum potential energy in nonlinear elasticity and the variational procedure, static admissible stress fields and kinematic admissible displacement fields are constructed, and hence the upper and the lower bounds of the macroscopic strain potential are obtained. The bounds given in the present paper differ so slightly that they both provide perfect approximations of the exact strain potential of the studied porous materials. It is also found that the upper bound proposed by previous authors is much higher than the present one, and the lower bounds given by Cocks is much lower. Moreover, the present calculation is also compared with the variational lower bound of Ponte Castañeda for statistically isotropic porous materials. Finally, the validity of the hollow spherical RVE for the studied nonlinear porous material is discussed by the difference between the present numerical results and the Cocks bound. 相似文献
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针对二维语言变量在描述不确定性信息自由度方面的不足,将直觉模糊变量融合到二维语言变量中,提出二维语言直觉变量的概念。首先定义了二维直觉语言变量之间的运算和比较规则,在此基础上提出了二维语言直觉信息的集成算子,如加权算术平均、加权几何平均以及广义加权算术平均。其次,基于最优最劣方法(BWM)和信息熵建立了属性权重的计算模型,并将MARCOS方法拓展到二维直觉语言环境,提出了基于集成算子和MARCOS的模糊多属性群决策方法。最后,在实例分析中通过参数敏感性分析、可靠性分析以及对比分析验证了方法的有效性和科学性。 相似文献
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