A NON-DIMENSIONAL PARAMETRIC STUDY OF ENHANCED ACTIVE CONSTRAINED LAYER DAMPING TREATMENTS

✍ Scribed by Yanning Liu; K.W. Lang

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 505 KB
• Volume: 223
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1998.2136

✦ Synopsis

on the Enhanced Active Constrained Layer (EACL) damping treatments and provide more comprehensive results that can be better generalized. For given strain distributions in the host structure and utilizing a self-sensing control law, closed form solutions to the longitudinal motion of the active cover sheet of the EACL are derived. Active, passive, and hybrid (total) loss factors are de®ned to discuss the damping properties of the treatments. With a non-dimensionalized formulation, this research identi®es and examines the major factors that aect the EACL damping characteristics. These factors are: the bending stiness ratio between the host structure and the constraining layer, the oset distance of the constraining layer from the host structure, the strain distribution in the host structure, the active control gain, the characteristic length of the EACL, the Viscoelastic Material (VEM) loss factor, and the stiness distribution of the edge elements. The eects of these factors on open-loop and closed-loop damping characteristics of the treatment are discussed. This investigation provides insights and design guidelines to generic one-dimensional EACL surface damping treatments.