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Monday, July 8 • 11:40 - 12:00
A SIMPLIFIED MODEL FOR SIMULATING STRUCTURAL AND ACOUSTIC RESPONSE OF ELECTRIC MOTORS

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This work addresses a simplified model for simulating the dynamic behavior of electric motors, more specifically the acoustic response of stators. Targeting this application, both structural and acoustic responses are calculated by Finite Element (FE) and Boundary Element (BE) methods, respectively. The FE model consists in a geometry simplification which represents the stator by curved and straight beam elements (body and teeth), and concentrated mass elements (wiring representation). An emulation of the dynamic forces acting on the stator teeth was also taken into consideration, however the forces magnitudes were arbitrarily chosen since this is not the focus of this document. The structural representation was validated by using a commercial software, achieving satisfactory results. Later on, the acoustic part was modeled by the Direct BE Method, using values for areas, normals, coordinates and velocities from the previously described FE part. Therefore, this algorithm was built to obtain both sound pressure level and radiated sound power (calculated by ISO 3744), with respect to the FE model and the forces of arbitrary magnitude prescribed on the stator teeth. Finally, this acoustic part also was validated by comparing the calculated sound pressure level with a commercial software which uses Acoustic FE as solution method. The observed results supports the idea that this simplified model is suitable for a limited range of frequency up to 3.8 kHz, and reduced the time of this analysis type by approximately 60x.

Moderators
MT

Md Tawhidul Islam Khan

Associate Professor, Saga University
Friendship and good Relations among IIAV members

Authors

Monday July 8, 2019 11:40 - 12:00 EDT
Westmount 1