Dear All,
I have a query regarding the bending moment (flap-wise and edgewise) conventions used in FAST for a ‘3 Bladee Upwind Anticlockwise’ rotating turbine. Based on OutListParameters.xls and FAST user manual, I drew the following sketches for getting the positive moments:
Coordinate_system.pdf (326 KB)
As I see from this sketch (2nd one), the flap wise moment comes to be positive about “upwind” direction when rather according to standards it should be positive along downwind direction (also makes sense). I am not sure, if blade local flapwise moment ‘along’ local yb axis means +ve or -ve local yb axis, in OutListParameters.xls? I interpreted its +ve axis, and then results come opposite to the standard. Similarly what would be the right convention for edgewise moments for this configuration of turbine?
These things make sense for clockwise rotating turbine but its confusing for anticlockwise configuration.
Can someone please, shed some light on this?
Thanks and Best Regards,
Neelabh