In-plane
Some blade characteristics or output are refered to as being
in-plane
or
out-of-plane.
These refers to planes that are characteristic of a blade and its movement around the main shaft.
When talking about
in-plane
at the blade root, we refer to the plane that contains the pitch axis and is perpendicular to the
Out-of-plane
plane at the root. When talking about
in-plane
for a
Blade aerodynamical station
(for example at the tip of the blade), we refer to the plane that contains the elastic center of that station and that is parallel to the
in-plane
plane at the root.
The figure below illustrates this concept: the
in-plane
plane at the root for the vertical blade is highlighted in yellow.
Note:
in the figure above, the cone and the tilt have unrealistically high values to show that the
in-plane
plane is
not
generally the same for all blades of a rotor.
In-plane deflections
This output can be found in the Blade [Time] sensor and the Blade aerodynamical station sensor .
This output can be found in the Blade [Time] sensor and the Blade aerodynamical station sensor .
The
in-plane deflection
is the deflection along the line defined by the
Airfoil plane
and the
in-plane
plane.
In-plane moments
This output can be found in the Blade [Time] sensor .
This output can be found in the Blade [Time] sensor .
The
in-plane
moment
is the bending moment that is perpendicular to the
in-plane
plane (i.e. that corresponds to a deflection in the
in-plane
plane).
The figure below illustrates a
positive
in-plane deflections, which results in a positive in-plane bending moment at the root of the blade.
