机构地区: 山东建筑大学工程结构现代分析与设计研究所
出 处: 《山东建筑大学学报》 2009年第2期142-144,179,共4页
摘 要: 重心Lagrange插值具有数值稳定性好、计算精度高的优点。采用重心Lagrange插值多项式建立未知函数的微分矩阵,采用配点法将梁的控制方程表示为代数方程组。通过求解代数方程组系数矩阵的特征值和特征向量,求得梁的临界应力和屈曲模态。数值算例表明,文中所提出的方法具有原理简单,易于程序实现和数值计算精度高的优点。 Barycentric Lagrange interpolation collocation method is of numerical stability and high accuracy.For the beam buckling problem,this paper presents the barycentric Lagrange interpolation collocation method to get the differentiation matrix of unknown function.So the control equation of beams can be expressed as linear systems by the collocation method.According to those formulas,we can get the buckling coefficients and modes of the beams with different boundary conditions.The principle of this method is sim...