![](https://csdnimg.cn/release/download_crawler_static/2734573/bg10.jpg)
Garrad Hassan and Partners Ltd Document:282/BR/010 VERSION: 3.81
The Outputs button on the Calculations screen allows the user to specify
in some detail
which loads and other outputs are desired. Once this is done, the Steady-state operational and
parked loads calculations can also be carried out (at specified fixed rotor speed and pitch
angle), and Data View used to see the results.
At the preliminary design stage, various turbine parameters can be adjusted and all these
calculations can be repeated rapidly until satisfactory results are obtained.
As further data is defined, more complex calculations can be carried out. For example, by
defining suitable combinations of drive train, generator and control characteristics, it becomes
possible to calculate the steady power curve and steady operational loads with the rotor speed
and/or pitch angle varying with wind speed as appropriate.
After defining the numbers of vibrational modes on the Modal screen, along with the
necessary mass and stiffness information as indicated on the Calculations screen, it becomes
possible to perform a Modal analysis calculation. Blade and tower bending can then be taken
into account in the calculations.
Simulations can also be performed once the Simulation control and Time varying wind
modules are defined. As always, the minimum data required is always indicated on the
Calculations screen, making it easy to ensure that the necessary data is defined for each
calculation to be done.
Note also the Show options button at the bottom of the Calculations screen. This provides a
rapid means of switching particular features off or on for a particular calculation. For
example, provided the energy losses module has been defined, the energy losses can be
switched off or on very easily using this feature, for all calculations where energy losses are
actually relevant.
2.2 Entering data
In each window, data is entered by typing in the required information in the fields provided.
Where there is a choice of alternative options, selection buttons or pull-down selectors are
provided. In some cases check boxes are provided for enabling or disabling particular items
(the item is selected when a tick appears in the box).
Where numerical values are entered, except in the case of dimensionless numbers, the units in
which the data is to be specified are shown. Double-clicking on the entry brings up a units
conversion box, allowing the user to enter values in a choice of different units.
Once data in a window has been edited, it is necessary to assign the changes by clicking the
OK button. Alternatively, any changes made since the data was last assigned may be
reversed by clicking the Cancel button.
2.3 Using project files
A project file stores all the currently defined information relating to the turbine, the wind field
information, and calculation parameters. Click OK on any open windows to ensure that the
data is assigned before saving to a project file. Project files have a .prj extension.
8 of 166