关于四阶变系数线性微分方程解的不稳定性

本文利用李雅普诺夫第二方法给出了至少有一个特征根具有正实部的四阶变系数线性微分方程解的不稳定性的充分条件.

一类三阶非线性微分方程解的不稳定性

文献［１］讨论了非线性缓变系统的渐近稳定性，文献［２］讨论了三阶变系数线性微分方程解的不稳定性。本文应用文献［１］、［２］的方法讨论一类三阶非线性微分方程解的不稳定性。

Stability of Solution of the Third Order Linear Differential Equation with Periodic Coefficients

In this paper, We give the sufficient conditions of the unstability of zero solution for the third order linear differential equation with periodic coefficients d^3x/dt^3+A(t)dx/dt+B(t)x=0.

一类四阶非线性微分方程解的全局稳定性

本文用J.A沃尔克(walker)及L.G克拉克(Clark)对非线性自治系统作李雅普诺夫函数的积分方法^([1])给出一类四阶非线性微分方程解的全局稳定性的充分条件.

非定常运动的三阶非线性微分方程解的稳定性

在文献[1]中E.T.Wall和M.L.Moe,对非线性定常运动给出了作李雅普诺夫函数的能量度量算法,本文,用类似的方法给出了非定常运动的三阶非线性微分方程解的稳定性的充分条件.

三阶时变非线性微分方程解的稳定性

在文献[1]、[2]中,E·T沃尔(Wall)和M.L.莫勒(Moe)对非线性系统给出了作李雅普诺夫函数的方法。本文应用文献[1]、[2]的方法,给出了三阶时变非线性微分方程解的稳定性的充分条件。

INSTABILITY OF SOLUTION FOR A CLASS OF THE THIRD ORDER NONLINEAR DIFFERENTIAL EQUATION

In Ref [1] the asymptotic stability of nonlinear slowly changing system has been discussed .In Ref [2] the instability of solution for the order linear differential equaiton with varied coefficient has been discussed .In this paper,we have discussed instability of solution for a class of the third order nonlinear diffeential equation by means of the metod of Refs [1] and [2] .

INSTABILITY OF SOLUTION FOR THE FOURTH ORDER LINEAR DIFFERENTIAL EQUATION WITH VARIED COEFFICIENT

In this paper, we give some sufficient conditions of the instability for the fourth order linear differential equation with varied coefficient, at least one of the characteristic roots of which has positive real part, by means of Liapunov's second method.

能量度量算法的应用

沃尔（Ｗａｌｌ）［１］用能量度量算法讨论了三阶非线性微分方程ｘ＋（１＋ｘ２）ｘ＋ｘ＋ｘ＝０的全局稳定性。本文也用同样的方法给出了两类非线性系统全局稳定性的充分条件，推广了沃尔（Ｗａｌｌ）的结果。