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Vector Average (VectAvg)
Inputs
Speed
Dir (Direction)
Outputs
Mean Speed Scalar – This is the scalar wind speed, not taking direction into account. The scalar
average of 10mph for an hour and 20mph for an hour is 15mph, regardless of changing direction.
Mean Magnitude Unit – This is the vector average of the wind speed using a unit vector. The
mean magnitude unit of 5mph at 0
for 1 hour and 100mph at 180
for 1 hours is 0mph (because
two unit vector pointing opposite directions cancel when added with vector addition).
Mean Magnitude Wind – This is the vector average of the wind speed which takes direction into
account. Here, the average of 10mph at 0
for 1 hour and 20mph at 180
for 1 hour is negative
5mph.
Mean Direction Unit – This is the wind direction (in degrees) not weighted for wind speed. Here,
the average of 10mph at 0
with 20mph at 90
is 45
.
Mean Direction Wind – This is the wind direction (in degrees) weighted for wind speed. Here,
the average of 10mph at 0
with 100mph at 90
is 84
.
STD Speed Scalar – This is the standard deviation of the scalar wind speed.
STD Direction Unit – This is the standard deviation of the direction unit.
STD Direction Wind – This is the standard deviation of the direction wind.
Min Speed Scalar – This is the minimum of the scalar wind speed.
Max Speed Scalar – This is the maximum of the scalar wind speed.
Max Direction – This is the direction taken at the time the max speed is detected.
Count – This is the number of samples that have been taken.
VsumX/n – This is the vectored average of the X direction components
VsumY/n – This is the vectored average of the Y direction components
sumX/n – This is the average of the X direction components
sumY/n – This is the average of the Y direction components
Description
The Vector Average block is a special version of the Average block that includes computations
to make a vector average. The vector average is important to any sensor that has a circular
discontinuity, such as a wind sensor with the crossover from 0 to 359 degrees. This block is, in
fact, geared toward wind sensors, but could be used any time performing a vector average is
Summary of Contents for Xpert2
Page 2: ......
Page 11: ...Chapter 1 Introduction...
Page 16: ......
Page 17: ...Chapter 2 Getting Started...
Page 86: ......
Page 87: ...Chapter 4 Graphical Setup Diagrams...
Page 104: ......
Page 105: ...CHAPTER 5 EXAMPLE SETUPS...
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Page 130: ......
Page 131: ...Chapter 7 Installation...
Page 140: ......
Page 141: ...Chapter 8 Maintenance and Troubleshooting...
Page 145: ...Appendix A Setup Blocks...
Page 266: ......
Page 267: ...Appendix B Updating the Firmware...
Page 290: ......
Page 291: ...Appendix E Software Development Kit SDK...
Page 293: ...Appendix F Creating Custom Voice Files...
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