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Update on #40 Vibratory Mode

Discussion about #40 vibratory mode and identifying suspect anemometers

62 topics in this forum

  1. Is one of the spikes on the frequency plot [from the webinar presentation] the actual rotation rate?

    By Julia Austin,
    • 0 replies
    • 4.3k views

  2. What percentage of returned anemometers has this issue?

    By Julia Austin,
    • 0 replies
    • 3.6k views

  3. How do we determine if the data we have collected is valid?

    By Julia Austin,
    • 0 replies
    • 4.4k views

  4. Is it possible to send anemometers back to identify if they are vulnerable to vibration?

    By Julia Austin,
    • 0 replies
    • 3.6k views

  5. Once an anemometer shows signs of dragging, how often will it go into the vibratory mode? 30% of the time in 5-10m/s wind? 70%?

    By Julia Austin,
    • 0 replies
    • 3.7k views

  6. If I buy sensors now, could they have this vibratory mode?

    By Julia Austin,
    • 0 replies
    • 3.4k views

  7. Can temperature be a factor in drag or vibratory mode?

    By Julia Austin,
    • 0 replies
    • 2.9k views

  8. Is there any relationship between vibratory mode and turbulence intensity?

    By Julia Austin,
    • 0 replies
    • 1.9k views

  9. Is there any relationship between the vibratory mode and wind direction and/or boom orientation?

    By Julia Austin,
    • 0 replies
    • 1.9k views

  10. What is the root cause of the vibratory mode or mechanism that causes it to occur? Will the fix entail replacement of defective material or change to the manufacturing process?

    By Julia Austin,
    • 0 replies
    • 3k views

  11. Could you discuss the onset of the vibratory mode and time it takes to present itself? Could any sensor be impacted at any time in its life?

    By Julia Austin,
    • 0 replies
    • 3.2k views

  12. Until you have new sensors to sell, what will you sell? Will NRG supply a different anemometer with tower orders until the problem is corrected?

    By Julia Austin,
    • 0 replies
    • 4.2k views

  13. Will NRG issue refunds or eventually, replacements?

    By Julia Austin,
    • 0 replies
    • 4k views

  14. Even though it may not be of interest to everyone, will the cause and modifications be documented?

    By Julia Austin,
    • 0 replies
    • 3.9k views

  15. Confirm that slides 8 and 10 (in the webinar presentation) show one, then both, then no bad sensors from top to bottom.

    By Julia Austin,
    • 0 replies
    • 3.9k views

  16. How far back does the historical data go and has there ever been a period when no sensor dragging existed?

    By Julia Austin,
    • 0 replies
    • 4.1k views

  17. Does NRG recommend performing a 2 week run time prior to installing sensors?

    By Julia Austin,
    • 0 replies
    • 3.4k views

  18. Warranty Question

    By cbrosky,
    • 1 reply
    • 5.3k views

  19. What anemometers will work with the Symphonie logger besides the #40? What anemometer does NRG recommend in lieu of the #40?

    By Julia Austin,
    • 0 replies
    • 3k views

  20. When will I get another update?

    By Julia Austin,
    • 0 replies
    • 3.5k views

  21. When will NRG be shipping good sensors again? How do I get some test sensors?

    By Julia Austin,
    • 0 replies
    • 3.3k views

  22. What are your success criteria for the validation of the revised design?

    By Julia Austin,
    • 0 replies
    • 3.1k views

  23. What role do booms play in the occurrence of #40 slow down?

    By Julia Austin,
    • 0 replies
    • 3.1k views

  24. Can a ball bearing anemometer get into a vibratory mode?

    By Julia Austin,
    • 0 replies
    • 3.2k views

  25. How do you explain the 2-26 week onset of vibratory mode?

    By Julia Austin,
    • 0 replies
    • 3.2k views
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