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BandG WTP3 Manual

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The rst damping number in the lter le is as for functions 1-3 (i.e. - inverse of required damping time in
secs/10); the second species the bound - outside this value, the damping becomes less until at 8 times the
bound value there is almost no damping at all. These functions are particularly useful for boat speed and
heading when coming out of a tack.
For example we might use non-linear damping on our heading so that when it is changing rapidly after a
manoeuvre it is less damped than when we are sailing a steady course. A typical lter le would look like:
12 0.1 4
This gives a damping of 1 second in normal use (inverse of 0.1 divided by 10); however, when dierence between
the new data and the last value is greater than 4°, the damping gradually reduces until at 32° dierence, no
damping is applied.
Damping example 2: Dependent Damping
Damping functions 16, 17 and 18 are exponential functions similar to functions 1, 2 and 3 except that the time
constant for the damping can be determined with respect to another variable in the WTP3 database.
During a manoeuvre True Wind Direction (TWD) can be unsteady. If we wish to use some damping to display
TWD more steadily based upon data from before the start of the manoeuvre then we could lter it based on the
value of Yaw Rate using damping function 17 (Exponential 360º). To do this we could create the following lter
le (twd.l):
17
Table 56
0 0.1
3 0.02
6 0.0125
9 0.01
10 0.01
The rst line of the le indicates the damping type to be used. In the example, the 56 after the word Table
indicates that the damping will be calculated with respect to Yaw Rate as 56 is the variable number for gyro_dyw
(see bg_vars).
Therefore, in this example, the table controls the time constant for the exponential damping depending on
the Yaw Rate of the vessel: the rst column is the Yaw Rate and the second is the time constant to be used (as
in functions 1,2 and 3 i.e. inverse of required damping time in secs/10). This le would result in the following
damping being applied:
YAW RATE º/S DAMPING S
0 1
3 5
6 8
>9 10
… 66 …


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