Internal Shape Optimization of Rotor Blade Cross-Section Based on Automatic Modeling Program

초록

Cross-section of rotor blade is usually constructed by stacking several sub-structures complicatedly, such as skin, spar, erosion shield, and others. Therefore, it is highly difficult to design an optimal internal shape of cross-section which has desirable structural and inertial section properties. In practical situations, it is common to adopt a legacy internal shape, and to change the shape by trial and error. To reduce the shortcomings of conventional approach, an efficient automatic procedure to design optimal internal shape of cross-section is proposed in this paper. For the purpose, script based automatic modeling/mesh program is developed by using open CASCADE library, and is utilized in optimization procedure. It is possible to regenerate the model without manual operation of users. Therefore it could be efficiently utilized in optimization procedure with no difficult. In optimization, genetic algorithm is utilized because it is highly difficult to obtain gradient in the present problem. Through the proposed automatic design procedure, optimal designs are carried out for representative examples including KARI(Korea Aerospace Research Institute) small scale blade. From the results, the efficiency of the proposed procedure is justified.