5. PMASS element free vibration tests

This free vibration tests check the PMASS3 point mass elements. The test compute the first n eigenfrequencies of a clamped beam with a consistent mass matrix or with equivalent PMASS3 elements:

  • beam.mdl: Consistent beam element mass formulation.

  • pmass3.mdl:PMASS3 point masses lumped at the mesh nodes. The density of the beam elements is then set to 0. Note that the PMASS tests are performed with B2 elements only, the B3 elements not being suited for this type of test because of the extra node.

The beam dimensions can be consulted in the params.mdl file. The material is isotropic, and the beam is modeled with B2.S.RS elements.

The test compares all configurations, which must give the same result.