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I have a table with factors who can transform a regional windspeed to a local windspeed. The factors are calculated for different wind direction and speed sectors as shown in the table (fig. 2). Now I would like to obtain from the plotted graph (fig. 1) a function that theoretically fits the egg-shaped graph in the form of "a + b cos(alpha - phi)".

What I already know: a = average of the factors (for sure) b = something to do with the amplitude (?) alpha = a wind angle I suppose (?) phi = something to do with max and min (like here at 0° and 180° I would say)

It may be that this only goes for a well-defined speed sector, like 6-8 m/s

Thank you in advance! Sebastian

plotted graph of the table with factors (fig. 2)

table with factors per winddirection en windspeed sector

Vlieghertje
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    It is customary to ask to find what steps you took in helping yourself before demanding consultation help etc. from here, – Narasimham Aug 16 '21 at 17:37
  • @Narasimham I have calculated the factors myself, but my promotor wants an equation out of the graph, but I haven't a clue how to begin. The things 'I know' are suggestions from my supervisor. – Vlieghertje Aug 16 '21 at 18:18

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