而对应的前后两下梁固定架上分别固定有牵引下 梁；
The fixed racks of the corresponding pre and post lower beams are separately and fixedly provided with traction lower beams.
分别考虑了两种简单情况下梁的响应：阶跃激励和脉冲激励。
Two simple cases, step and impulse function responses, were considered respectively.
本文分析了轴向力和支承运动作用下梁的参数共振和内共振问题。
The parametric resonances and internal resonances of beams with axial force and supporting motion have been investigated.
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