The dynamic buckling of an elastic-plastic column subjected to axial impact by a rigid body has been discussed in this paper. The whole traveling process of elastic-plastic waves under impact action is analyzed with t...The dynamic buckling of an elastic-plastic column subjected to axial impact by a rigid body has been discussed in this paper. The whole traveling process of elastic-plastic waves under impact action is analyzed with the characteristics method. The regularity of stress changes in both column ends and the first separating time of a rigid body and column are obtained. By using the energy principle and taking into account the propagation and reflection of stress waves the lateral disturbance equation is derived and the power series solution is given. In addition, the critical buckling condition can be obtained from the stability analysis of the solution. By numerical computation and analysis, the relationship among critical velocity and impact mass, hardening modulus, and buckling time is given.展开更多
The dynamic buckling of an elastic-plastic column subjected to an axial impact by a rigid body was discussed by using the energy law. The traveling process of elastic-plastic waves under impact action was analyzed by ...The dynamic buckling of an elastic-plastic column subjected to an axial impact by a rigid body was discussed by using the energy law. The traveling process of elastic-plastic waves under impact action was analyzed by characteristics method. The equation of lateral disturbance used to analyze the problem was developed by taking into account the effect of elastic-plastic stress wave. The power series solution of this problem has been the power series approach. The buckling criterion of this problem was proposed by analyzing the characteristics of the solution. The relationship among critical velocity and impact mass, critical buckling length, hardening modulus was given by using theoretical analysis and numerical computation.展开更多
为了直观细致了解乘客在乘坐轨道交通时的体验感受,从乘客感知角度构建了满意度评价指标体系,采用CRITIC(criteria importance through inter-criteria correlation)法来实现指标的客观赋权,并用基于云模型的基本算法生成评价云和结果云...为了直观细致了解乘客在乘坐轨道交通时的体验感受,从乘客感知角度构建了满意度评价指标体系,采用CRITIC(criteria importance through inter-criteria correlation)法来实现指标的客观赋权,并用基于云模型的基本算法生成评价云和结果云,通过云的数字特征和云图的比较直观展现评价结果.以上海市轨道交通2号线的乘客满意度评价为例,验证了评价方法的有效性和合理性,同时该评价结果除了反映乘客的满意程度,也提供了对乘客认知差异和共识度的衡量,使得其具备了更大的使用价值.展开更多
针对离散车间生产计划缺乏通用的评价指标体系以及定性和定量相结合的综合评价方法,从经济性、时间性和适应性三个方面构建离散车间生产计划评价指标体系,提出一种基于组合赋权的离散车间生产计划综合评价方法。该方法通过综合可拓层次...针对离散车间生产计划缺乏通用的评价指标体系以及定性和定量相结合的综合评价方法,从经济性、时间性和适应性三个方面构建离散车间生产计划评价指标体系,提出一种基于组合赋权的离散车间生产计划综合评价方法。该方法通过综合可拓层次分析法、熵值法和改进CRITIC(Criteria Importance Through Intercriteria Correlation)法得到具有主客观意义的组合权重,提高了离散车间生产计划综合评价的科学性。实例验证结果表明该方法对数据的敏感程度更高,具有更好的评价灵敏度。展开更多
高校科技成果转化是我国高质量发展的重要新引擎,对其进行绩效评价的重要性日益凸显。面对评价过程中出现的不确定信息,引入云模型,提出了一种基于博弈论组合赋权和云模型的高校科技成果转化绩效评价模型,并采用IKLCM(improved Kullback...高校科技成果转化是我国高质量发展的重要新引擎,对其进行绩效评价的重要性日益凸显。面对评价过程中出现的不确定信息,引入云模型,提出了一种基于博弈论组合赋权和云模型的高校科技成果转化绩效评价模型,并采用IKLCM(improved Kullback-Leibler divergence based on cloud model)法计算云相似度距离,得出评价结果。通过对西南地区5个省份的高校进行实证分析,结果表明,该模型综合考虑主客观因素,组合权重科学合理,绩效云模型评价能得到准确可靠的评价结果。展开更多
基金Project supported by the National Natural Science Foundation of China (No. 10472076).
文摘The dynamic buckling of an elastic-plastic column subjected to axial impact by a rigid body has been discussed in this paper. The whole traveling process of elastic-plastic waves under impact action is analyzed with the characteristics method. The regularity of stress changes in both column ends and the first separating time of a rigid body and column are obtained. By using the energy principle and taking into account the propagation and reflection of stress waves the lateral disturbance equation is derived and the power series solution is given. In addition, the critical buckling condition can be obtained from the stability analysis of the solution. By numerical computation and analysis, the relationship among critical velocity and impact mass, hardening modulus, and buckling time is given.
基金Project supported by the National Natural Science Foundation of China (No. 10472076)
文摘The dynamic buckling of an elastic-plastic column subjected to an axial impact by a rigid body was discussed by using the energy law. The traveling process of elastic-plastic waves under impact action was analyzed by characteristics method. The equation of lateral disturbance used to analyze the problem was developed by taking into account the effect of elastic-plastic stress wave. The power series solution of this problem has been the power series approach. The buckling criterion of this problem was proposed by analyzing the characteristics of the solution. The relationship among critical velocity and impact mass, critical buckling length, hardening modulus was given by using theoretical analysis and numerical computation.
文摘为了直观细致了解乘客在乘坐轨道交通时的体验感受,从乘客感知角度构建了满意度评价指标体系,采用CRITIC(criteria importance through inter-criteria correlation)法来实现指标的客观赋权,并用基于云模型的基本算法生成评价云和结果云,通过云的数字特征和云图的比较直观展现评价结果.以上海市轨道交通2号线的乘客满意度评价为例,验证了评价方法的有效性和合理性,同时该评价结果除了反映乘客的满意程度,也提供了对乘客认知差异和共识度的衡量,使得其具备了更大的使用价值.
文摘针对离散车间生产计划缺乏通用的评价指标体系以及定性和定量相结合的综合评价方法,从经济性、时间性和适应性三个方面构建离散车间生产计划评价指标体系,提出一种基于组合赋权的离散车间生产计划综合评价方法。该方法通过综合可拓层次分析法、熵值法和改进CRITIC(Criteria Importance Through Intercriteria Correlation)法得到具有主客观意义的组合权重,提高了离散车间生产计划综合评价的科学性。实例验证结果表明该方法对数据的敏感程度更高,具有更好的评价灵敏度。
文摘高校科技成果转化是我国高质量发展的重要新引擎,对其进行绩效评价的重要性日益凸显。面对评价过程中出现的不确定信息,引入云模型,提出了一种基于博弈论组合赋权和云模型的高校科技成果转化绩效评价模型,并采用IKLCM(improved Kullback-Leibler divergence based on cloud model)法计算云相似度距离,得出评价结果。通过对西南地区5个省份的高校进行实证分析,结果表明,该模型综合考虑主客观因素,组合权重科学合理,绩效云模型评价能得到准确可靠的评价结果。
