Design optimization and stiffness-equivalent method for an integrated starter generator in aerospace applications

This study proposes a computational framework for the optimization and vibration analysis of an integrated starter generator using the stiffness-equivalent method. The stiffness-equivalent method was formulated based on the principle of minimum total potential energy and allows for the compensation of the stiffness of dummy structures such as main generator, exciter, and permanent magnet generator. We validated the proposed method by comparing the fine model and the equivalent model using 3D finite element analysis. An optimization was performed to achieve lightweight designs by considering operational constraints using the stiffness-equivalent method and PyAnsys. This approach produces design optimization with minimal weight while fulfilling all specified requirements. Furthermore, the framework can be used as a foundation for building a database of structural and vibrational properties of integrated starter generators, relevant to mechanical and aerospace fields. The validation results confirm that the proposed method is appropriate for these applications, owing to its relative simplicity and computational efficiency.