本文根据汽车车架结构的特点，应用薄壁杆系有限单元法，对汽车车架的固有频率和主振型进行了计算。
This paper gave the computer simulation of natural frequencies and vibrational modes of truck frames, based on the structural features of the frame, by finite element method of thin wall rod system.
对于下承式钢箱系杆拱桥来说，主梁是结构设计的关键部位。
The steel-box girder of the tie-bar arch-bridge is the key part in the structural design.
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