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[bos #29336] problem in inertia calculus

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jfa 2022-04-13 16:19:54 +03:00
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doc/salome/gui/GEOM/input/inertia.doc
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@ -8,7 +8,20 @@ This operation returns the axial moments of inertia for the selected geometrical
The table displays: The table displays:
- 3*3 matrix of its own moments of inertia (in rows <b> 1:1, 2:1</b> and <b>3:1</b>) and - 3*3 matrix of its own moments of inertia (in rows <b> 1:1, 2:1</b> and <b>3:1</b>) and
- the relative moments of inertia (in row <b>IX & IY & IZ</b>) - the main (principal) moments of inertia (in row <b>IX & IY & IZ</b>)
\note The matrix of inertia is returned in the central coordinate
system (G, Gx, Gy, Gz) where G is the centre of mass of the system
and Gx, Gy, Gz the directions parallel to the X(1,0,0), Y(0,1,0), Z(0,0,1)
directions of the absolute cartesian coordinate system.
\note There is always a set of axes for which the products of inertia
of a geometric system are equal to 0. These axes are the principal
axes of inertia. Their origin is coincident with the center of mass
of the system. The associated moments are called the principal moments
of inertia. The principal axes are not reported by this functionality.
\br
\note This dialog supports navigation through the selectable objects (in OCC 3D viewer only): \note This dialog supports navigation through the selectable objects (in OCC 3D viewer only):
- Scroll mouse wheel with pressed \em Ctrl key or press \em "S", \em "P" keys when input focus is - Scroll mouse wheel with pressed \em Ctrl key or press \em "S", \em "P" keys when input focus is
@ -19,8 +32,8 @@ For more details, please refer to the \em "Functionality common for OCC and VTK
of the GUI module's documentation. of the GUI module's documentation.
<b>TUI Command:</b> <em>geompy.Inertia(Shape),</em> where \em Shape is <b>TUI Command:</b> <em>geompy.Inertia(Shape),</em> where \em Shape is
a shape for which the own matrix of inertia and the relative moments of inertia are a shape for which the own matrix of inertia and the main (principal) moments
returned. of inertia are returned.
See also a \ref tui_inertia_page "TUI example". See also a \ref tui_inertia_page "TUI example".