This paper is devoted to study the existence of an infinitude of periodic solutions for a class of second order linear PDE systems without damping.
本文首先给出了一类具有无穷多个周期解的无阻尼二阶线性偏微分方程所描述的系统。
The natural vibration of linear systems with any viscous damping was discussed in this paper, its applications to the response and identification of the systems were explicated.
本文讨论任意粘性阻尼线性系统的固有振动，说明它在求系统响应和识别中的作用。
This paper is concerned with vibration problem of linear systems with viscous damping.
本文讨论粘性阻尼线性系统的振动问题。
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