Active-Passive Hybrid Adaptive Structures for Vibration Controls -- An Integrated Approach

摘要

The objective of this research is to develop, validate and evaluate novel active-passive hybrid adaptive structures for real-time vibration suppressions. These structures could have the advantages of both the passive (stable, low power requirement, tail-safe) and active (high performance, feedback actions) systems. Two types of smart structure configurations have been investigated and advanced: structures with enhanced active constrained layer (EACL) treatment, and structures with active-passive piezoelectric networks (APPN). Accomplishments include: (a) Robust control laws have been synthesized for APPN to compensate for uncertainties. (b) Nonlinear analysis and control methods have been developed to utilize the high authority actions of APPN. (c) The integrated EACL-APPN configuration has been analyzed, it is shown that both the narrowband and broadband controls can be achieved with such configurations (d) A detailed non-dimensional analysis on EACL performance has been developed to provide design guidelines. (e) A new hybrid constrained layer (HCL) configuration has been developed by mixing both active and passive materials to form hybrid coversheets - such a design can outperforms stems with pure active PZT coversheets.