Modal analysis & harmonic response
An eigenfrequency is a frequency in which the object will transfer vibrational to kinetic energy with minimal losses. In modal analysis we determine the natural mode shapes and frequencies of an object during free vibration. An example of an object in which the eigenfrequency is an important characteristic is the mast of a wind turbine, as shown in the figure. If the rotor would operate in the eigenfrequency of the mast, this would lead to increasing vibrations, which in the end could lead to failure of the structure.
The figure on the right and animation show you a modal analysis performed on a water turbine arm. The calculated eigenfrequencies in FEA were compared to the measured eigenfrequencies, with the goal of determining the damping characteristics of the water surrounding the turbine.
One step up from modal analysis, Huygens Engineers simulates the vibrational behavior of a structure or component as a result of a vibratory excitation. This is harmonic response.
