Vibration Analysis of Collecting Electrodes by means of the Hybrid Finite Element Method

Table 1

Comparison of features of the finite element method and hybrid finite element method.

Feature	Finite element method	Hybrid element method
Generalized coordinates	Displacements of nodes of elements (elastic coordinates) (36)	Displacements and rotations of rigid elements (rigid coordinates) (22)
Stiffness matrix	Interpolation of field displacements and rotations by means of continuous functions	Interpolation of field displacements and rotations by means of continuous functions
		Additional transformation of elastic coordinates to rigid coordinates:
Mass matrix	Interpolation of field displacements and rotation velocities by means of continuous functions	Inertial moments are taken into account
	Additional operations in order to use lumped mass