Abstract
Modal analysis is used almost in all research domains that are studying the behaviour of vibrating structures with the purpose to reduce noise and vibrations' level and to increase the durability of the structure.
The paper will present the results obtained by experimental modal analysis of two different kinds of power unit structures (longitudinal and transversal).
To perform the experimental modal analysis was selected the method of frequency response function.
There are presented the measurement chain used at these experiments, some results obtained for the structure of the power unit housing (without shafts and connecting roads assembly), and results obtained for the complete power unit structure.
Experimentally, the first main modes were bending vibrations in the vertical and the horizontal planes and torsion vibrations of the whole housing. The experimental modal shapes are similar to those obtained by FEM modal analysis.