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vibratory mode
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#40
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Re: Can NRG specify by serial number which sensors can enter the vibratory mode? How do we determine if sensors delivered are within the problem batch(es)?
Do you mean that serial no like 179500038313 could be affected by the vibratory mode problem? or do i have to remove some digits from this number in which case, which one will be the serial number for this anemometer?
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Cobardin
on 04-08-2009
Does NRG plan to develop any tools that will aid in identifying and cleaning these areas of bad data?
Q: Does NRG plan to develop any tools that will aid in identifying and cleaning these areas of bad data? A: We are working closely with our round table experts and hope to share some of our findings on techniques and methodologies to address this issue.
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-18-2008
What is the expected timing for recommendations/conclusions on how to fully identify/correct problems with sensor drag?
Q: What is the expected timing for recommendations/conclusions on how to fully identify/correct problems with sensor drag? A: Some experts in the industry are developing their own methodologies for data analysis. Our expectation is that these results will be presented at future conferences.
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-18-2008
What is the magnitude of additional uncertainty that a dragging sensor is estimated to cause (%)?
Q: What is the magnitude of additional uncertainty that a dragging sensor is estimated to cause (%)? A: The magnitude of uncertainty will vary based on the tower configuration and data analysis methodology. We understand that the error can be 1%, but additional data quality checks can reduce this to...
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-18-2008
Could this problem be found in the non-calibrated #40 anemometers?
Q: Could this problem be found in the non-calibrated #40 anemometers? A: Yes, the same vibratory mode could occur in non-calibrated #40’s manufactured in 2006.
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-18-2008
Can a ball bearing anemometer get into a vibratory mode?
Q: Can a ball bearing anemometer get into a vibratory mode? A: Based on our understanding of this issue, yes, it is theoretically possible, though we did not study this in our investigation.
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-10-2008
How do you explain the 2-26 week onset of vibratory mode?
Q: How do we explain the 2-26 week onset of vibratory mode? A: The answer to this question involves a more detailed description of the root cause than we are able to share at this time. That information will be forthcoming upon field test verification.
Posted to
Update on #40 Vibratory Mode
(Forum)
by
Julia Austin
on 12-10-2008
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