Mj. Lam et al., VIBRATION CONTROL THROUGH PASSIVE CONSTRAINED LAYER DAMPING AND ACTIVE CONTROL, Journal of intelligent material systems and structures, 8(8), 1997, pp. 663-677
To add damping to systems, viscoelastic materials (VEM) are added to s
tructures. In order to enhance the damping effects of the VEM, a const
raining layer is attached, creating a passive constrained layer dampin
g (PCLD) treatment. When this constraining layer is an active element,
the treatment is called active constrained layer damping (ACLD). Rece
ntly, the investigation of ACLD treatments has shown it to be an effec
tive method of vibration suppression. In this paper, the treatment of
a beam with a separate active and PCLD element will be investigated. T
wo new hybrid variations will be introduced. A Ritz-Galerkin approach
is used to obtain discretized equations of motion. The damping is mode
led using the Golla-Hughes-McTavish (GHM) method and the system is ana
lyzed in the time domain. By optimizing on the performance and control
effort for both the active and passive case, it will be shown that hy
brid treatment is capable of lower control effort with more inherent d
amping, and is therefore a better approach to suppressing vibration th
an ACLD.