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Paul Thomassen
.User deleted
Thanks for your very interesting review of Ashes.
Answers:
1- How are handled in Ashes load cases required by IEC61400?
2- Need to run the program as many times as are the load cases to be analyzed?
Answer 1 and 2: To run a batch of load cases, open View->Batch analysis. When 'Start run' is pressed all load cases are run including turbulent wind simulation using TurbSim.
So, to run the IEC load cases the relevant parameters must be set manually. The plan is to include a IEC load case template that has all the relevant setting for each load case. We plan to implement this by August.
3- you can extract the time data of the tensions (or internal actions) in a specific section of the tower?
You can get a sensor for any of the elements and nodes of the model. Press 'Adds a sensor' in the sesnor window. Choose 'Element' in the 'Sensor options' that is opened. When you click on an element it is displayed in red in the model making it easier to pick the correct element.
When you have picked the elements you are interested in, you can give the sensors a (optional) name and press OK.
4- I did not see the possibility of introducing a statistical distribution (Weibull or Rayleigh) of average wind speeds.
Weibull and Rayleigh distributions are typically used for long term (yearly) wind distribution. It would be interested to include that in Ashes to calculate e.g. fatigue life time. However, as far as I know none of the available aeroelastic software - incl Ashes - includes long term wind distribution.
5- you can extract the fatigue loads on a specific section of the tower?
You can extract reaction forces (internal loads) for any element of the model (see answer 3). However, stresses, rainflow counting, stress concentration factors/hot spots, SN curves must presently be calculated outside of Ashes. For the longer term this will be interesting to include in Ashes.
6- What loads are given to the designer of the foundations?
If you are thinking of the (typically) concrete foundation on which the tower is placed, then the concrete engineer would get the time histories of support nodes/elements.
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Ashes - Calcolo turbine eoliche |
