From: jfa Date: Wed, 13 Apr 2022 13:19:54 +0000 (+0300) Subject: [bos #29336] problem in inertia calculus X-Git-Tag: V9_9_0b1~3 X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=a775d71f3fce7db34a704c9a1cb93c0e8490f957;p=modules%2Fgeom.git [bos #29336] problem in inertia calculus --- diff --git a/doc/salome/gui/GEOM/input/inertia.doc b/doc/salome/gui/GEOM/input/inertia.doc index bfb439b88..d0a37107f 100644 --- a/doc/salome/gui/GEOM/input/inertia.doc +++ b/doc/salome/gui/GEOM/input/inertia.doc @@ -8,7 +8,20 @@ This operation returns the axial moments of inertia for the selected geometrical The table displays: - 3*3 matrix of its own moments of inertia (in rows 1:1, 2:1 and 3:1) and -- the relative moments of inertia (in row IX & IY & IZ) +- the main (principal) moments of inertia (in row IX & IY & IZ) + +\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): - 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. TUI Command: geompy.Inertia(Shape), where \em Shape is -a shape for which the own matrix of inertia and the relative moments of inertia are -returned. +a shape for which the own matrix of inertia and the main (principal) moments +of inertia are returned. See also a \ref tui_inertia_page "TUI example".