本文建立了具有阻尼项的高阶微分方程新的振动定理。
This paper obtains a new oscillation theorem of high-order differential equation with damping.
根据由李亚普诺夫定理导出的综合阻尼系数的原理，统一定义了同步发电机的动态阻尼力矩系数和动态同步力矩系数。
A unified definition for damping torque coefficient of synchronous machines is proposed in this paper according to the principle of synthetic damping coefficients deduced from the Lyapunov Theorem.
与原来的方程相比，它增加了一个非线性极强的阻尼项。 我们同样用定理1．2介绍过的方法，证明了径向对称解的存在性。
We also use the method in Theorem 1.2 to prove that there exists a smooth 2-dimensional radical symmetric solution for this problem.
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