Finite Element Analysis (FEA)

Finite element analysis is used for calculating stresses, strains, and natural frequencies for geometries where there are not simple handbook equations.  Where accuracy is paramount, FEA is used in conjuction with testing to determine the properties of a structure.

An FEA model can provide detailed spatial resolution that is not possible with testing.  However the loads on a structure, and the damping in the structure can only be obtained from testing.  Once a model is built, a modal test is an excellent way to confirm the accuracy of the FEA model.  The modal test also provides the damping values required by the FEA model.  Then strain gauge testing is used to determine the actual loads on the structure.  These loads are then used in the FEA analysis for further model refinemant.

In vibration troubleshooting situations, FEA is an excellent tool to design modifications to a structure to eliminate resonances at operating speed.

For other problems an combined thermal/structural solution is required.  The design of edge insulation in a calender roll to control the oxbow effect is one example.  Here again the most accurate solution is obtained when the FEA analysis is combined with calender temperature measurements along with the CD caliper profile at that temperature.