Abstract
The aim of this research is to determine the optimal topologies for viscoelastic lamina used for vibration damping. The optimization objective is to maximize the system loss factor for the first resonance frequency of a base structure. Previous optimal design studies examining viscoelastic lamina have been size or shape optimization studies, assuming a certain topology for the damping treatment. In this study, the topology is optimized to maximize vibration damping levels. The loss factor is computed using the Modal Strain Energy method in the optimization process. For the initial and optimal topologies, the loss factor results are validated by using the half-power bandwidth method, which requires obtaining the forced response of the structure. The ABAQUS finite element code is used to model the structure with two-dimensional, plane stress, continuum elements. The optimization code uses a Sequential Quadratic Programming algorithm. This study extends the results of a previous study by Lumsdaine (2002) by examining the effects of a number of parameters on the optimal damping levels and the optimal topologies. The parameters examined include the total elastic and viscoelastic material fractions and the base beam thickness. Results show that significant improvements in damping performance, over 300% in some cases, are obtained by optimizing the constrained damping layer topology.
| Original language | English |
|---|---|
| Pages (from-to) | 219-227 |
| Number of pages | 9 |
| Journal | American Society of Mechanical Engineers, Aerospace Division (Publication) AD |
| Volume | 68 |
| DOIs | |
| State | Published - 2003 |
| Externally published | Yes |
| Event | 2003 ASME International Mechanical Engineering Congress - Washington, DC., United States Duration: Nov 15 2003 → Nov 21 2003 |