MassMatrix
2D/3D• MassMatrix[bnum] returns the submatrix of the current system mass matrix associated with body bnum.
• The bnum argument can take any of the forms accepted by Loads to obtain a submatrix associated with multiple bodies. • MassMatrix[All] returns the entire system mass matrix.
• Centrifugal[All] + MassMatrix[All] . Acceleration[All] returns the entire dynamic load vector.
• In Modeler3D, if and only if the current solution method is Angular and the current coordinate system is Local will the system mass matrix be a matrix of constants. Otherwise it will generally be a function of Euler coordinates.
• See also: Loads. Further Examples Load the Modeler3D package and define a simple model. Here is the mass matrix of the link body, expressed in Euler parameter space.
Out[2]= |  |
Out[3]//MatrixForm=
 |
A change of modeling coordinate system can substantially change the mass matrix expression. Out[6]//MatrixForm=
 |
See HelpModel3D.
| 
