当支撑梁的弹簧非常软时，梁的模态振型看起来非常像刚体。
When the springs supporting the beam are very soft, then the mode shape for the beam looks very much like a rigid body.
分别计算了对称截面及非对称截面多跨连续梁，当相邻跨按对称振型振动时的固有频率，讨论了不同边界条件对固有频率的影响。
The natural frequencies of symmetrical section and non-symmetrical section continuous-beam are calculated in detail, and results of continuous-beam with different constraint conditions are given.
将梁函数组合法应用到求解双壳系统的固有特性，得到了双壳系统有电磁刚度项时的固有频率和振型。
A combination method of the beam function is used for obtaining the natural characteristics of the double shell system.
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