Vibration Control Of Structures With Active Constrained Layer Damping Treatments

Active Constrained Layer Damping (ACLD) treatments are that the uncontrolled constrained layer of passive constrained layer damping is replaced by controlled piezoelectric material. The shear deformation of viscoelastic materials can be controlled actively in order to enhance energy dissipation of vibration. ACLD is a typical hybrid strategy of active and passive vibration control. It combines the advantages of active control and passive damping and reveals great potential applications on structure vibration control. In this paper, a finite element model is developed to describe and predict the vibration characteristics of the structures treated with ACLD treatments. The research of vibration control about the structures treated with ACLD treatments is presented. The contents of the paper are expressed as follows:â‘ A finite element dynamic model for the structures with ACLD treatments is derived based on the constitutive equations of elastic, viscoelastic and piezoelectric materials by application of Hamilton principle and virtual work principle. The dynamics analysis of the structures treated with ACLD treatments is researched. Comparison between the results of FE numerical model and ANSYS software verifies the correctness of dynamic model in this paper.â‘¡The closed-loop control system considering displacement and velocity feedback of self-sensing voltage from sensor layer is developed. The dynamic behaviors of ACLD structures including nature frequencies, loss factors and responses in frequency domain are investigated. The influence of controller gains on vibration suppression is discussed. The peak points of vibration are moved with proportional controller gains, but they are not changed with differential controller gains. The effect of derivative control is better than proportional control.â‘¢The effects of several key parameters such as location, coverage of ACLD treatments and thickness of viscoelastic materials on vibration suppression of cylindrical shells with ACLD treatment is also discussed. When different mode shapes are focused on, an optimal placement of ACLD treatment should be adopted.â‘£The experimental modal analysis of ACLD plates is carried on. Testing the mode characteristics of base plate verifies the correctness of dynamic model. Comparison between the FRFs of base plate and ACLD plate verifies validity of the controller.