It is not reasonable to estimate the average relationship degree in statistics by using the mean of relationship coefficients between the individuals in a animal population.According to different usage of relationship...It is not reasonable to estimate the average relationship degree in statistics by using the mean of relationship coefficients between the individuals in a animal population.According to different usage of relationship coefficient,the estimation method of average relationship coefficient in animal population was disscussed by using Z transformation or CSC transformation,respectively,when relationship coefficient shows relationship degree or probability.展开更多
对含有分数阶微分项和参数激励的Duffing⁃van der Pol振子的动力学行为进行了研究,分析了在黏惯性(1≤p≤2)和参数激励共同作用下系统的各项参数对系统幅频曲线的影响。采用平均法分析此系统,用等效线性阻尼和等效质量的概念处理分数阶...对含有分数阶微分项和参数激励的Duffing⁃van der Pol振子的动力学行为进行了研究,分析了在黏惯性(1≤p≤2)和参数激励共同作用下系统的各项参数对系统幅频曲线的影响。采用平均法分析此系统,用等效线性阻尼和等效质量的概念处理分数阶微分项,得到系统的近似解析解。将所得近似解析解与数值解进行比较,二者具有较高的吻合度,证明了解析解的正确性。分析了系统参数对幅频响应曲线的影响,发现共振峰值、共振频率、共振区域、多值解的范围和解的数量都会受到系统参数的影响。经过分析发现,外激励幅值和分数阶微分项系数在一定程度上会抑制参数激励的效果。展开更多
基金Foundation item :Financed by the Heilongjiang province natural science fund.(1997- 0 3)
文摘It is not reasonable to estimate the average relationship degree in statistics by using the mean of relationship coefficients between the individuals in a animal population.According to different usage of relationship coefficient,the estimation method of average relationship coefficient in animal population was disscussed by using Z transformation or CSC transformation,respectively,when relationship coefficient shows relationship degree or probability.
文摘对含有分数阶微分项和参数激励的Duffing⁃van der Pol振子的动力学行为进行了研究,分析了在黏惯性(1≤p≤2)和参数激励共同作用下系统的各项参数对系统幅频曲线的影响。采用平均法分析此系统,用等效线性阻尼和等效质量的概念处理分数阶微分项,得到系统的近似解析解。将所得近似解析解与数值解进行比较,二者具有较高的吻合度,证明了解析解的正确性。分析了系统参数对幅频响应曲线的影响,发现共振峰值、共振频率、共振区域、多值解的范围和解的数量都会受到系统参数的影响。经过分析发现,外激励幅值和分数阶微分项系数在一定程度上会抑制参数激励的效果。
