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3.5. DISTURBANCE CONFIGURATION
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fied. Variation is defined as the heading variation (in degrees) and the distribution
of the variation (possible distributions include Normal, Triangular and Uniform).
The Random mobility indicates that the disturbance moves in a random manner. If
this option is selected, the maximum heading variation over a given period of time
must be specified (for instance, the disturbance cannot change its heading more than
45 degrees per minute). If the disturbance follows a predetermined path, the Path
mobility should be specified. If this option is selected, the path should be specified
(by pressing the Path button). Finally, the Wind mobility type indicates that the
disturbance moves with the wind.
If one of the General Heading, Random or Wind motion types is specified, the
user can also specify if the disturbance should be constrained to s specified area, in
which case the area should also be specified, by pressing the Area button (the area
specification is similar to the one presented in section 3.3.2.
If a motion type other than Stationary is specified, the speed of the disturbance
should also be specified, which is done in the Speed Configuration Panel, accessible
by pressing the Speed button – see Fig. 3.32.
Figure 3.32: Disturbance Speed Configuration Panel
The type of speed should be chosen from the existing types in the combo
box – Constant, Linear, Polynomial, Exponential, Logarithmic, Root, Sinusoid and
Custom. For each of these types (with the exception of Custom speed), the generic
equation is shown below, and the coefficients that allow for the configuration of
the equation are made available. In the case of a Polynomial speed, there is the
possibility of adding new coefficients, by pressing the Add Coeff button. In the case