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High-frequency rotation (period < 10s)
No relevant time series found.
Mid-frequency rotation (10s < period < 15s)
No relevant time series found.
Low-frequency rotation (15s < period)
No relevant time series found.
Fields:
- Mean: the mean upcross wave height within a segment
- SD: the standard deviation of the upcross wave height
- Period: the mean upcross wave period
- Revs: the number of cal stand revolutions in the segment
- Source: link to a displacement plot of the data
Validation checks: These are based on the limits set by Datawell
for their calibration. Settings are approximate, since Datawell
uses different periods (6.25s, 12.5s, 20s) on their test rig.
Green values are within the limits, while
red values fall outside the limits.
- Heave: the percentage of the expected heave (trough-to-crest
displacement) measured.
Limits: 98%-102% for periods under
15 seconds. 94%-102% for longer periods.
- Dir: the difference between the mean measured direction and
the cal stand direction, in degrees.
Limits:
+/- 2 degrees for all periods.
- Check: the measured check factor, calculated as the horizontal/vertical
displacement ratio.
Limits:
1.0-1.05 for periods under 10s; 1.0-1.15 for periods under 15s; 1.0-1.5
for longer periods.
Notes: All xy files are examined and the longest uninterrupted
section of each z timeseries is used. Segments of the
timeseries are grouped such that the height of each
wave is within 10% of its immediate neighbors' heights and its period
is within 20% of its neighbors' periods. All segments covering a minimum
of 32 revolutions are included in the statistics.
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