空实心方截面梁的力学分析

The mechanical analysis of hollow square-section beam and solid square-section beam

前法兰是兆瓦级双定子直驱风力发电机组的主要承载部件,设计要求极其苛刻。因此,结构设计采用内圈、外圈、数根方管和腹板进行焊接形成箱体结构。先采用工程算法分别对应用于前法兰的空心方截面梁和实心方截面梁进行了在相同弯矩或扭矩作用下的力学分析,再利用ANSYS有限元软件对两者做了静力分析,验证了工程算法的推导结论。结果表明,前法兰结构中选取合适大小的方管作为焊接主体不仅能达到厚钢板所能满足的强度要求,还能减轻结构重量、降低成本。

As an important component used in MW double-stator wind generator,the front flange has extreme strict requirements.So the structure is designed with inner ring,outer ring,several square tubes and pectoral plates welded together.A engineering calculation is firstly utilized to analyze a hollow square-section beam and a solid square-section beam,when they suffer the same bending moment or torque.Then ANSYS is adopted to analyze both of them and certify the previous results.The results show that choosing proper square tubes as the main supporting parts could not only satisfy the requirements of the front flange,but also reduce weight and cost.