含复指数函数对偶积分方程的数值求解

在断裂力学和热弹性动力学中，常常会出现含复指数函数对偶积分方程的求解，此类方程不能直接用Copson-Sih方法求解。文中基于Copson—Sih方法，证明了含余弦函数的对偶积分方程可化为第二类Fred—holm积分方程进行数值求解。利用欧拉公式，可将含复指数函数的对偶积分方程为含正余弦函数的对偶积分方程，进一步可转化为第二类Fredholm积分方程进行数值求解。最后给出了含余弦函数对偶积分方程的数值算例。     

众数公式的积分证明

本文扼要介绍了众数的特点及其应用范围，给出了众数估计值计算公式的一种积分证明方法。     

直线参数方程的应用

随着新教材对“三角”的压缩及要求的降低，学生熟练应用直线的参数方程解决问题的障碍越来越多．对如何利用其解题是应探索的问题．     

用分析力学的方法推导以广义坐标表示的虚功原理

本文考虑非稳定约束情况，应用广义坐标推导了具有理想约束质点系的虚功原理表达式。     

Transient Responses of Flexible Non—uniform Spinning Shaft with Nonlinear and Asymmetric Supports

In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed.     

L可积函数的唯一性问题

给出勒贝格积分唯一性的几个结果.     

求直线方程的八类典型错误

求直线方程是《直线和圆的方程》这章中的基本题型之一.在求解问题时,如果考虑不周全或忽视特殊情况,就往往会造成漏解现象,下面加以剖析.1 忽略斜率不存在