Comparison between control strategies for active constrained layer damping treatment to control the sound radiation from a vibrating structure

2005 ◽  
Vol 117 (4) ◽  
pp. 2602-2602 ◽  
Author(s):  
Hui Zheng ◽  
Chun Lu ◽  
Heow Pueh Lee
Keyword(s):  
Control Strategies ◽  
Sound Radiation ◽  
Constrained Layer Damping ◽  
Active Constrained Layer Damping ◽  
Active Constrained Layer

Active Control of Vibration and Noise Radiation from Fluid-Loaded Cylinder using Active Constrained Layer Damping

2002 ◽  
Vol 8 (6) ◽  
pp. 877-902 ◽  
Author(s):  
W. Laplante ◽  
T. Chen ◽  
A. Baz ◽  
W. Sheilds
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Acoustic Radiation ◽  
Sound Radiation ◽  
Element Model ◽  
Water Tank ◽  
Constrained Layer Damping ◽  
Active Constrained Layer Damping ◽  
Active Constrained Layer ◽  
Surrounding Fluid

Vibration and sound radiation from fluid-loaded cylindrical shells are controlled using patches of Active Constrained Layer Damping (ACLD). The performance and the enhanced damping characteristics via reduced vibrations and sound radiation in the surrounding fluid is demonstrated both theoretically and experimentally. A prime motivation for this work is the potential wide applications in submarines and torpedoes where acoustic stealth is critical to the effectiveness of missions. A finite element model is also developed to predict the vibration and the acoustic radiation in the surrounding fluid of the ACLD-treated cylinders. The developed model is used to study the effectiveness of the control and placement strategies of the ACLD in controlling the fluid-structure interactions. A water tank is constructed that incorporates test cylinders treated with two ACLD patches placed for targeting specific vibration modes. Using this arrangement, the effectiveness of different control strategies is studied when the submerged cylinders are subjected to internal excitation, and the radiated sound pressure level in the water is observed. Comparisons are made between the experimental results and the theoretical predictions to validate the finite element model.

Control of Sound Radiation of an Active Constrained Layer Damping Plate/Cavity System Using the Structural Intensity Approach

2002 ◽  
Vol 8 (6) ◽  
pp. 903-918 ◽  
Author(s):  
Mohamed S. Azzouz ◽  
J. Ro
Keyword(s):  
Smart Materials ◽  
Passive Control ◽  
Sound Radiation ◽  
Constrained Layer Damping ◽  
Acoustic Cavity ◽  
Structural Intensity ◽  
Vibrating Plates ◽  
Active Constrained Layer Damping ◽  
Cavity System ◽  
Active Constrained Layer

Considerable attention has been devoted to actively and passively controlling the sound radiation from vibrating plates into closed cavities. With the advent of smart materials, extensive effort has been exerted to control the vibration and sound radiation from flexible plates using smart sensors/actuators. The Active Constrained Layer Damping (ACLD) treatment has been used successfully for controlling the vibration of various flexible structures. The treatment provides an effective means for augmenting the simplicity and reliability of passive damping with the low weight and high efficiency of active controls to attain high damping characteristics over broad frequency bands. This study investigates a numerically simulated example consisting of an ACLD treated plate/acoustic cavity system excited by a point harmonic force. In this study, an ACLD treated plate/acoustic cavity coupled finite element model is utilized to calculate the structural intensity and sound pressure radiated by the vibrating plates. In the passive control, the optimum placement of ACLD patches is determined by the structural intensity of ACLD treated plates and compared to the results obtained by using the strain energy approach. The influence on the structural intensity of the plate due to the damping treatment is investigated.

Newtonian and Variational Formulations of the Dynamics of Plates with Active Constrained Layer Damping Treatments

2004 ◽  
Vol 10 (3) ◽  
pp. 399-421 ◽  
Author(s):  
Chul H. Park ◽  
A. Baz
Keyword(s):  
Numerical Solutions ◽  
Control Strategies ◽  
Laminated Plates ◽  
Analytical Models ◽  
Constrained Layer Damping ◽  
Active Constrained Layer Damping ◽  
Active Vibration Damping ◽  
Active Vibration ◽  
Active Constrained Layer ◽  
Variational Formulations

In this paper we present Newtonian and variational formulations of the dynamics of plates treated fully with active constrained layer damping (ACLD). The governing equations of the plate/ACLD system are derived to describe the interaction between the dynamics of the plates, the viscoelastic damping layer and the active piezoelectric constraining layers. The developed equations of the plate/ACLD system provide analytical models for predicting the dynamics of laminated plates subjected to passive and active vibration damping controls. Numerical solutions of the analytical models are presented for simply-supported plates in order to study the performance of the plate/ACLD system for different control strategies. The developed models present invaluable means for designing and predicting the performance of the smart laminated plates that can be used in many critical engineering applications.

Newtonian and Variational Formulations of the Vibrations of Plates With Active Constrained Layer Damping

2001 ◽  
Author(s):  
Chul H. Park ◽  
A. Baz
Keyword(s):  
Numerical Solutions ◽  
Control Strategies ◽  
Laminated Plates ◽  
Analytical Models ◽  
Constrained Layer Damping ◽  
Active Constrained Layer Damping ◽  
Active Vibration Damping ◽  
Active Vibration ◽  
Active Constrained Layer ◽  
Variational Formulations

Abstract This paper presents Newtonian and variational formulations of the dynamics of plates treated fully with Active Constrained Layer Damping (ACLD). The developed equations of the plate/ACLD system provide analytical models for predicting the dynamic of laminated plates subjected to passive and active vibration damping controls. Numerical solutions of the analytical models are presented for simply-supported plates in order to study the performance of the plate/ACLD system for different control strategies. The developed models present invaluable means for designing and predicting the performance of the smart laminated plates that can be used in many critical engineering applications.

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