Modelling of Integrated Structure using ANSYS

2008-03-14T08:43:00.000-07:00

After finding the appropriate mesh size and the natural frequency of the host structure, the modeling of the piezoelectric patch is carried out. The piezoelectric patch is modeled with the dimensions 72x25.4x0.71 mm. After modeling the beam and the piezoelectric patch, the key points are merged to fix the patch with the beam. The material properties are defined for both, the patch and the beam. The element type selected for the beam is SOLID 45 and that for the piezoelectric patch is SOLID 5.

Meshed Model of Beam with Piezoelectric Patch

After modeling, the electrical degrees of freedom of the patch are coupled at the outer surfaces of the patch and the intermediate common surfaces between the patch and the beam. After modeling, the first natural frequency of the integrated structure is calculated by performing the modal analysis. The natural frequency is found out to be 5.6514 Hz.

The mode shapes at the natural frequencies are of extreme importance, as the deformation of the beam is maximum for these mode shapes. So in any vibration control methodology, the main aim should be to avoid the natural frequencies at any circumstances.

Simply Supported Beam Vibrating in First Mode, 5.65 Hz

Simply Supported Beam Vibrating in Second Mode, 27.03 Hz

Simply Supported Beam Vibrating in Third Mode, 66.72 Hz

Modelling of Integrated Structure using ANSYS.

Modelling of Integrated Structure using ANSYS