Study Of Multidisciplinary Design Optimization And Approximation Technique For Turbine Blade

The design of aeroengine refers to many disciplines such as aerodynamics, heat transfer, structure, vibration, longevity and reliability. As the requirements of design increased, conventional designing methods are too difficult to meet the needs, it is necessary to introduce a new method that is able to consider the interaction of disciplines (subsystem) and obtain system optimum design. That is Multidiscipline Design Optimization (MDO). The MDO of turbine blades has been mainly studied, primary contents are as follows:1. The conception, generation background and research progress of MDO were summarized in the article. With the most potentiality of development for complex system design, MDO had been well developed in aspect of aeroengine and its representative members design. Some difficulty and corresponding solution in its application had also been presented in the article.2. The major MDO methods were introduced, such as Multidisciplinary Feasible (MDF) and Collaborative Optimization (CO) used in the article.3. The parameterize modeling method of turbine blades was established, which was closely related to offering variable design parameter that optimization required, automatically generating corresponding model for each disciplinary analysis, affording parameter support for information exchange between disciplines and so on. Parameterize modeling method based on quintic polynomial used in MDO was introduced in detail.4. There were some coupling disciplines such as aerodynamics, heat transfer and structure in design of turbine blades. When each disciplinary analysis was realized, how solve multidisciplinary coupling relation became research's key and difficult point. Interpolation method was used to realize the transfer of coupling information (Air pressure, Temperature, Deformation) between two disciplines, so as to the decoupling was completed.5. Considering time-consuming cycle and achieving convergence slowly in the MDO of turbine blades, the approximation technique and variable complexity method were introduced to increase the design efficiency. It reviewed and discussed the major approximate models systematically, implemented design of experiment, then chose design variables for optimization and founded approximation initial model. Finally,...