Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Microwave cavity filter modal vibration analysis

381 views

Published on

mechanical resonances in small mechanical components can present trouble in certain environments

Published in: Engineering
  • Login to see the comments

  • Be the first to like this

Microwave cavity filter modal vibration analysis

  1. 1. M ICROW AVE CAVITY FILTER SHOCK AND VIBRATION M ODAL ANALYSIS Don Blanchet 3B Associates 4/12/1999 sighting electronics
  2. 2. POSSIBLE SITUATIONS OF CONCERN – NOISE SOURCES
  3. 3. GOALS Identify the modal vibration resonant frequencies of a microwave cavity filter and its tuning elements. Provide the results to the electronic engineering staff. Understand self generated electrical signal noise due to mechanical shock sources such as: pyrotechnic explosive events – shipboard rapid gun fire HALT testing with hammer blows
  4. 4. WARNING HALT/HASS Microwave engineers – please note HALT “vibration” machines use hammer blows to generate 3 axis excitation. The exciting signal felt by the tested units will have significant shock components above 2KHz. Very small components can be damaged during HALT and HASS.
  5. 5. MODEL MICROWAVE CAVITY FILTER Gold plated 6061-t6 aluminum
  6. 6. MODEL – COVER REMOVED Interdigital microwave filter elements
  7. 7. FINITE ELEMENT MESH 71,000 degrees of freedom
  8. 8. RESULTS FEA EIGENVALUE EXTRACTION
  9. 9. MODE SHAPE 1
  10. 10. MODE SHAPE 2
  11. 11. MODE SHAPE 3
  12. 12. MODE SHAPE 4
  13. 13. MODE SHAPE 5
  14. 14. MODE SHAPE 6
  15. 15. MODE SHAPE 7
  16. 16. MODE SHAPE 8
  17. 17. MODE SHAPE 9
  18. 18. MODE SHAPE 10
  19. 19. MODE SHAPE 11
  20. 20. MODE SHAPE 12
  21. 21. MODE SHAPE 13
  22. 22. MODE SHAPE 14
  23. 23. MODE SHAPE 15
  24. 24. MODE SHAPE 16
  25. 25. MODE SHAPE 17
  26. 26. MODE SHAPE 18
  27. 27. MODE SHAPE 19
  28. 28. MODE SHAPE 20
  29. 29. MODE SHAPE 21
  30. 30. MODE SHAPE 22
  31. 31. MODE SHAPE 23
  32. 32. MODE SHAPE 24
  33. 33. MODE SHAPE 25
  34. 34. MODE SHAPE 26
  35. 35. MODE SHAPE 27
  36. 36. MODE SHAPE 28
  37. 37. MODE SHAPE 29
  38. 38. MODE SHAPE 30
  39. 39. RESULTS SUMMARY

×