Journal ArticleDOI
Optimum Design and Control of Active Constrained Layer Damping
Amr M. Baz,J. Ro +1 more
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In this paper, the design parameters and control gains of the resulting Active Constrained Layer Damping (ACLD) treatments are optimally selected, in order to maximize the modal damping ratios and minimize the total weight of the damping treatment.Abstract:
Conventional Passive Constrained Layer Damping (PCLD) treatments with viscoelastic cores are provided with built-in sensing and actuation capabilities to actively control and enhance their vibration damping characteristics. The design parameters and control gains of the resulting Active Constrained Layer Damping (ACLD) treatments are optimally selected, in this paper, for fully-treated beams using rational design procedures. The optimal thickness and shear modulus of the passive visco-elastic core are determined first to maximize the modal damping ratios and minimize the total weight of the damping treatment. The control gains of the ACLD are then selected using optimal control theory to minimize a weighted sum of the vibrational and control energies. The theoretical performance of beams treated with the optimally selected ACLD treatment is determined at different excitation frequencies and operating temperatures. Comparisons are made with the performance of beams treated with optimal PCLD treatments and untreated beams which are controlled only by conventional Active Controllers (AC). The results obtained emphasize the potential of the optimally designed ACLD as an effective means for providing broad-band attenuation capabilities over wide range or operating temperatures as compared to PCLD treatments.read more
Citations
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Journal ArticleDOI
Advances in piezoelectric finite element modeling of adaptive structural elements: a survey
TL;DR: In this paper, the advances and trends in the formulations and applications of the finite element modeling of adaptive structural elements are surveyed and discussed in a first attempt to survey and discuss the advances.
Journal ArticleDOI
A finite element for beams having segmented active constrained layers with frequency-dependent viscoelastics
George A. Lesieutre,Usik Lee +1 more
TL;DR: In this article, a finite element for planar beams with active constrained layer (ACL) damping treatments is presented, where a time-domain viscoelastic material model and the ability to readily accommodate segmented (i.e., non-continuous) constraining layers are discussed.
Journal ArticleDOI
Hybrid Active-Passive Damping Treatments Using Viscoelastic and Piezoelectric Materials: Review and Assessment
TL;DR: In this article, a review of the open literature concerning geometric configurations, modeling approaches and control algorithms for hybrid active (piezoelectric)-passive (viscoelastic) damping treatments of beams is provided.
Journal ArticleDOI
Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams
TL;DR: In this paper, a truncated acoustic black hole (ABH) beam with passive constrained viscoelastic layer (PCVL) is shown to achieve better results than an ABH beam with an unconstrained VL, even if they add equal mass to the system.
Journal ArticleDOI
Optimization of partial constrained layer damping treatment for vibrational energy minimization of vibrating beams
Hui Zheng,C. Cai,X.M. Tan +2 more
TL;DR: In this article, an optimization study is presented to minimize the vibrational energy (VE) of vibrating beams with passive constrained layer damping (PCLD) treatment, with the objective of minimizing the integrated global VE of the base beam over a frequency range of interest.
References
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Journal ArticleDOI
Use of piezoelectric actuators as elements of intelligent structures
Edward F. Crawley,Javier de Luis +1 more
TL;DR: In this paper, a scaling analysis is performed to demonstrate that the effectiveness of actuators is independent of the size of the structure and evaluate various piezoelectric materials based on their effectiveness in transmitting strain to the substructure.
Journal ArticleDOI
Distributed Piezoelectric-Polymer Active Vibration Control of a Cantilever Beam
Thomas Bailey,James E. Hubbard +1 more
TL;DR: In this article, an active vibration damper for a cantilever beam was designed using a distributed-parameter actuator and distributedparameter control theory, and preliminary testing of the damper was performed on the first mode of the beam.
Book
Structure-Borne Sound: Structural Vibrations and Sound Radiation at Audio Frequencies
TL;DR: A Little Dynamics Survey of Wave Types and Characteristics as discussed by the authors : Damping, Impedance and Mobility, Attenuation of Structure-Borne Sound, Sound Radiation from Structures, Generation and Measurement of Structure Borne Sound
Journal ArticleDOI
Frequency and Loss Factors of Sandwich Beams under Various Boundary Conditions
TL;DR: In this article, a complete set of equations of motion and boundary conditions governing the vibration of sandwich beams are derived by using the energy approach, and they are solved exactly for important boundary conditions.
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Use of piezoelectric actuators as elements of intelligent structures
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