Course project involving use of FEM software ATILA for optimization of ultrasonic motor

1. METAL TUBE ULTRASONIC MOTOR FEM Applications – EE 597B By Siddharth Advani

5. Comparisons

8. Structure and Assembly

10. Mesh Snapshot 3600 nodes

11. 5 degree angle optimization 95 degrees 90 degrees 85 degrees The key is to adjust the two split resonance peaks corresponding to two orthogonal bending modes. When the two peaks almost overlap, maximum wobbling vibration amplitude is obtained. Position Optimization of the Piezoelectric Plates on the Surface of the Metal Tube

12. Admittance Spectrums 85 degrees 90 degrees 95 degrees 227 kHz 205 kHz 227 kHz 229 kHz 226 kHz 229 kHz Optimization range is between 85 degrees and 90 degrees.

13. 2 degree angle optimization The key is to adjust the two split resonance peaks corresponding to two orthogonal bending modes. When the two peaks almost overlap, maximum wobbling vibration amplitude is obtained. 87 degrees 227 kHz 89 degrees 227 kHz 229 kHz

14. Optimization Graph

15. First Bending Mode Angle = 89 degrees Frequency = 227 kHz

16. First Bending Mode Angle = 89 degrees Frequency = 229 kHz

17. Hula-Hoop Mode Angle = 89 degrees Frequency = 228 kHz

21. Thank-you!