I would like to find the natural frequencies of an onshore wind turbine and I have chosen to start with the input file test26.fst. In the FAST manual, it reads that I should make a linearization, which can be done by setting analmode to 2 in the simulations control part of the input-file. I haven’t been able to find this switch in the test26.fst-file. As I now have understood, linearization is only possible in FAST 7.0 (from the readme-file, p. 9). Is this true or is there some other way of determining the natural frequencies with FAST 8.15? What would be the easiest way of converting the FAST 8.15-files to FAST 7.0-format?
Jacob K. Pedersen