风电机组塔筒结构的薄弱处是门洞，门洞设计的好坏将直接影响到塔筒整体的可靠性。借助CAE工具ANSYS Workbench对大型风电机组塔筒门洞进行参数化建模，并将决定门洞形状的3个参数（椭圆长轴RMX16、短轴RMN18和直边H21）作为输入参数，von mises应力作为输出参数，设优化目标为应力最小，得到优化后门洞形状为椭圆形。实践证明，利用结构优化设计的理念，对塔筒门洞进行形状参数优化，可以求得最优塔筒门洞形状，用以提升塔筒的可靠性。与常规结构设计方法相比，采用优化设计方法，显著提高了设计效率、设计品质，而且节约了设计成本，可以在风电机组的产品设计中推广应用。

The tower door is the weakest location in the tower structure, its design directly affect the reliability of the tower. The CAE analysis tool ANSYS Workbench is used to model the giant wind turbine tower door, the 3 parameters (elliptical long axis RMX16, short axis RMN18 and straight edge H21) of the tower door shape are regarded as input parameters, the von mises stress is regarded as output parameter, and the optimization goal is set to the minimum stress, then the optimal shape of the tower door which is elliptical can be obtained. Practice has proved, using the concept of structure optimization design can obtain the optimal tower door shape, which is used to enhance the reliability of the tower. Compared with the conventional design method, the optimal design method can improve the design efficiency and quality, save the cost of design, it can be further application in product design of wind turbines.