Strain energy is potential energy. For the simple 1DOF mass-spring-damper system, the strain energy is defined as the following equation.
The strain energy of an arbitrary RFlex P node can be calculated in the same way.
Where,
Therefore, we can calculate the strain energy of the RFlex body with the summation of all the energy each node. The final formula is represented by Eigen Value and Modal Coordinate.
Where,
is a diagonal matrix with eigen
values of RFlex body.