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Relevant bibliographies by topics / Active constrained layer damping

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Academic literature on the topic 'Active constrained layer damping'

Author: Grafiati

Published: 3 June 2025

Last updated: 13 July 2025

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Journal articles on the topic "Active constrained layer damping"

1

Shen, I. Y. "Hybrid Damping Through Intelligent Constrained Layer Treatments." Journal of Vibration and Acoustics 116, no. 3 (1994): 341–49. http://dx.doi.org/10.1115/1.2930434.

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This paper is to propose a viable hybrid damping design that integrates active and passive dampings through intelligent constrained layer (ICL) treatments. This design consists of a viscoelastic shear layer sandwiched between a piezoelectric constraining cover sheet and the structure to be damped. According to measured vibration response of the structure, a feedback controller regulates axial deformation of the piezoelectric layer to perform active vibration control. In the meantime, the viscoelastic shear layer provides additional passive damping. The active damping component of this design will produce adjustable and significant damping. The passive damping component of this design will increase gain and phase margins, eliminate spillover, reduce power consumption, improve robustness and reliability of the system, and reduce vibration response at high frequency ranges where active damping is difficult to implement. To model the dynamics of ICL, an eighth-order matrix differential equation governing bending and axial vibrations of an elastic beam with the ICL treatment is derived. The observability, controllability, and stability of ICL are discussed qualitatively for several beam structures. ICL may render the system uncontrollable or unobservable or both depending on the boundary conditions of the system. Finally, two examples are illustrated in this paper. The first example illustrates how an ICL damping treatment, which consists of an idealized, distributed sensor and a proportional-plus-derivative feedback controller, can reduce bending vibration of a semi-infinite elastic beam subjected to harmonic excitations. The second example is to apply an ICL damping treatment to a cantilever beam subjected to combined axial and bending vibrations. Numerical results show that ICL will produce significant damping.

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Langote, Pankaj K., and P. Seshu. "Experimental Studies on Active Vibration Control of a Beam Using Hybrid Active∕Passive Constrained Layer Damping Treatments." Journal of Vibration and Acoustics 127, no. 5 (2005): 515–18. http://dx.doi.org/10.1115/1.2013292.

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Hybrid damping designs with active piezoelectric materials and passive viscoelastic materials (VEMs) combine the advantages of both active and passive constrained layer damping treatments. In this study, experiments have been conducted on nine systems viz., bare beam, active damping (AD), passive constrained layer damping (PCLD—three variants) and hybrid active∕passive constrained layer damping (Hybrid AD∕PCLD—four variants). Based on the time domain analysis of these systems, it is shown that the “best” performance is obtained using a hybrid damping configuration wherein the VEM and the piezoelectric layers are acting separately.

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Baz, A., and J. Ro. "Performance Characteristics of Active Constrained Layer Damping." Shock and Vibration 2, no. 1 (1995): 33–42. http://dx.doi.org/10.1155/1995/309359.

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Theoretical and experimental performance characteristics of the new class of actively controlled constrained layer damping (ACLD) are presented. The ACLD consists of a viscoelastic damping layer sandwiched between two layers of piezoelectric sensor and actuator. The composite ACLD when bonded to a vibrating structure acts as a “smart” treatment whose shear deformation can be controlled and tuned to the structural response in order to enhance the energy dissipation mechanism and improve the vibration damping characteristics. Particular emphasis is placed on studying the performance of ACLD treatments that are provided with sensing layers of different spatial distributions. The effect of the modal weighting characteristics of these sensing layers on the broad band attenuation of the vibration of beams fully treated with the ACLD is presented theoretically and experimentally. The effect of varying the gains of a proportional and derivative controller and the operating temperature on the ACLD performance is determined for uniform and linearly varying sensors. Comparisons with the performance of conventional passive constrained layer damping are presented also. The results obtained emphasize the importance of modally shaping the sensor and demonstrate the excellent capabilities of the ACLD.

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Panda, Satyajit, and Ambesh Kumar. "A design of active constrained layer damping treatment for vibration control of circular cylindrical shell structure." Journal of Vibration and Control 24, no. 24 (2016): 5811–41. http://dx.doi.org/10.1177/1077546316670071.

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A new 1-3 viscoelastic composite material (VECM) layer is designed for improved active constrained layer damping (ACLD) treatment of vibration of a functionally graded (FG) circular cylindrical shell. Besides this improved active damping treatment, another objective of this study is to control all the modes of vibration of the shell effectively using the treatment (active constrained layer damping) in layer-form throughout the outer shell-surface. In this design of active constrained layer damping treatment in layer-form, its (active constrained layer damping) necessary conformability with the curved host shell-surface is ensured by the use of a vertically reinforced 1-3 piezoelectric composite (PZC) constraining layer, whereas the effective control of several modes of vibration of the shell is achieved by the use of electrode-patches over the surfaces of the constraining layer. A fruitful strategy in the arrangement of electrode-patches is proposed for effective control of several modes of vibration of the shell using one configuration of the electrode-patches. An electric potential function is assumed for this use of electrode-patches and a geometrically nonlinear coupled electro-visco-elastic incremental finite element model of the overall shell is developed for its analysis in the frequency-domain. The analysis reveals significant improvement of active damping characteristics of the active constrained layer damping layer for the use of the present 1-3 viscoelastic composite material layer instead of the traditional monolithic viscoelastic material (VEM) layer. The analysis also reveals the suitability of the present strategy of arrangement of electrode-patches for achieving aforesaid control-activity of the ACLD layer. The effects of temperature in the host functionally graded shell and different geometric parameters in the design of the 1-3 viscoelastic composite material layer on the damping characteristics of overall shell are also presented.

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Crassidis, John L., Amr Baz, and Norman Wereley. "H ∞ Control of Active Constrained Layer Damping." Journal of Vibration and Control 6, no. 1 (2000): 113–36. http://dx.doi.org/10.1177/107754630000600106.

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Baz, A. "ROBUST CONTROL OF ACTIVE CONSTRAINED LAYER DAMPING." Journal of Sound and Vibration 211, no. 3 (1998): 467–80. http://dx.doi.org/10.1006/jsvi.1997.1315.

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Liu, Yanning, and K. W. Wang. "Active-Passive Hybrid Constrained Layer for Structural Damping Augmentation." Journal of Vibration and Acoustics 122, no. 3 (2000): 254–62. http://dx.doi.org/10.1115/1.1303821.

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A new surface-damping concept with an active-passive hybrid constraining layer (HCL) is proposed to improve the damping performance of traditional active constrained layer (ACL) systems. Instead of using a pure piezoelectric constraining layer, passive and active materials are used together to constrain the viscoelastic material layer. A generic model of the HCL treatment is presented. Nondimensional equations of motion and boundary and connecting conditions are derived. The closed-form solutions to the equations are developed and analyzed. Tabletop tests are also performed to verify the feasibility of the new damping concept. It is shown that by properly selecting a passive constraining material and assigning appropriate lengths for the active and passive constraining parts, HCL can outperform a system with a pure active PZT coversheet, both in terms of its fail-safe ability and closed-loop damping performance. [S0739-3717(00)01503-8]

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Baz, A. "Boundary Control of Beams Using Active Constrained Layer Damping." Journal of Vibration and Acoustics 119, no. 2 (1997): 166–72. http://dx.doi.org/10.1115/1.2889698.

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A variational mathematical model is developed using Hamilton’s principle to describe the dynamics of beams fully-treated with Active Constrained Layer Damping (ACLD) treatments. The resulting distributed-parameter model is utilized in devising a globally stable boundary control strategy which is compatible with the operating nature of the ACLD treatments. The effectiveness of the ACLD in damping out the vibration of cantilevered beams is determined for different control gains and compared with the performance of conventional Passive Constrained Layer Damping (PCLD). The results obtained demonstrate the high damping characteristics of the boundary controller particularly over broad frequency bands.

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Zhai, Jingyu, Jiwu Li, Daitong Wei, Peixin Gao, Yangyang Yan, and Qingkai Han. "Vibration Control of an Aero Pipeline System with Active Constraint Layer Damping Treatment." Applied Sciences 9, no. 10 (2019): 2094. http://dx.doi.org/10.3390/app9102094.

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In this paper, vibration control of an aero pipeline system using active constrained layer damping treatment has been investigated in terms of the vibration and stress distribution. A three-dimensional finite element model of such a pipeline with active constrained layer damping (ACLD) patches is developed. The transfer of the driving force under harmonic voltage is analyzed based on the finite element model. The vibration control of the pipeline with active constrained layer damping treatment under different voltages is computed to analyze the influence of control parameters and structural parameters on the control effect. An experiment platform is developed to validate the above relations. Results show that the performance of the active constrained layer damping treatment is affected by the elastic modulus and thickness of the viscoelastic layer, control voltage and structure size. The performance increases significantly with the rising of the control voltage and cover area of ACLD patches among these parameters.

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Liu, Y., and K. W. Wang. "Enhanced Active Constrained Layer Damping Treatment for Broadband Vibration Suppression." Journal of Vibration and Control 8, no. 6 (2002): 777–803. http://dx.doi.org/10.1177/1077546029202.

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In this paper, the Enhanced Active Constrained Layer (EACL) treatment is investigated for broadband damping augmentations on beam structures. The EACL concept was originally proposed to improve the damping performance of the Active Constrained Layer (ACL) by introducing edge elements at the treatment boundaries. It has been recognized that the edge elements can increase ACL performance by enhancing the direct active authority of the piezoelectric constraining layer. It has also been demonstrated that the edge element stiffness and the host structure strain field have significant influence on the overall closed-loop system damping and its various components: the active damping, the closed-loop passive damping, and the open-loop passive (fail-safe property - without any active action) damping. Through utilizing this finding, the present study explores how the EACL performance can be synthesized for multiple mode broadband applications using symmetric configurations. Although the edge elements will tend to reduce the maximum possible open-loop damping of one (or a few) vibration mode, open-loop damping of the other higher order modes could actually be increased. Moreover, the modal damping reduction in the open-loop system can generally be compensated by the significant increase of the closed-loop damping. In other words, the closed-loop EACL system damping over a wide frequency range can be significant, which makes it attractive for broadband vibration and noise suppression.

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Dissertations / Theses on the topic "Active constrained layer damping"

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Rongong, Jem Athing. "Shear and extensional behaviour of passive and active constrained layer damping." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269380.

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Chantalakhana, Chak. "Model-based control of plate vibrations using active constrained layer damping." Thesis, University of Sheffield, 2000. http://etheses.whiterose.ac.uk/14796/.

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In this thesis, the author presents a numerical and experimental study of the application of active constrained layer damping to a clamped-clamped plate. Piezoelectric actuators with modal controllers are used to improve the performance of vibration suppression from the passive constrained layer damping treatment. Surface damping treatments are often effective at suppressing higher frequency vibrations in thin-walled structures such as beams, plates and shells. However, the effective suppression of lower frequency modes usually requires the additional of an active vibration control scheme to augment the passive treatment. Advances in the technologies associated with so-called smart materials are dramatically reducing the cost, weight and complexity of active structural control and make it feasible to consider active schemes in an increasing number of applications. Specifically, a passive constrained layer damping treatment is enhanced with an active scheme employing a piezoceramic (PZT) patch as the actuator. Starting with an established finite element formulation it is shown how model updating and model reduction are required to produce a low-order state-space model which can be used as the basis for active control. The effectiveness of the formulation is then demonstrated in a numerical study. Finally, in the description of the experimental study it is shown how modes in the frequency range from 0 to 600 Hz are effectively suppressed: the two lowest modes (bending and torsional) through active control, the higher modes (around ten in number) by the passive constrained damping layer. The study'S original contribution lies in the experimental demonstration that given a sufficiently accurate model of the plate and passive constrained damping layer, together with a suitable active feedback control algorithm, spillover effects are not significant even when using a single sensor and single actuator. The experimental traces show, in some instances, minor effects due to spillover. However, it can be concluded that the presence of the passive layer introduces sufficient damping into the residual modes to avoid any major problems when using only the minimum amount of active control hardware.

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Koh, Byungjun. "Hybrid active-passive constrained layer damping treatments in beams, plates and shells." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/397336/.

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The basic concept of Hybrid Active-Passive Constrained Layer Damping (HAPCLD) treatment was proposed by introducing active control to the concept of passive constrained layer damping configuration in the 1990s to compensate for weak points in active and passive controls by using their respective merits for more robust and stable control. Since then, combinations of various configurations and applicable control strategies have been proposed and studied in many engineering areas. However, there is still a need for a new modelling method to more easily establish models of HAPCLD treatment and its validation through control analysis and experiment with various structures from beams to curved plates. In this thesis, velocity feedback control strategy was applied to cantilever beams with four different configurations of HAPCLD treatment to check their applicability. Moreover, the application was expanded to flat and curved plates. Control results with each configuration for flat and curved plates were analysed by using self-established MATLAB codes based on the Finite Element Method (FEM) with the basic concept of a layer-wise approach for coupling each layer of structures and deriving Equivalent Single Layer (ESL) models. This new numerical modelling method was established by introducing coupling matrices based on a layer-wise approach to combine individual FE mass and stiffness matrices of each layer into one ESL model for a whole structure. Furthermore, these numerical models were supported by experiments in a lab. All measured data was compared with simulation results and they were confirmed in good agreement in general. In addition to this, the relation between mode shapes and control by piezoelectric patches occupying a broader area than an ideal actuator was studied to find the conditions for more stable control of flat and curved plates. In conclusion, as discussed for active control with beams, AC/PSOLD treatment, which consists of a piezoelectric actuator directly attached to a base structure and a stand-off layer with a viscoelastic core and elastic constraining patch laminated on the piezoelectric actuator, was clarified to give the most efficient and robust active control results for plates regardless of the curvature of all HAPCLD treatments dealt within this thesis as well. AC/PSOLD treatment could give similar reductions with smaller control gain in simulation. And, larger reductions were obtained with measured transfer functions in experiments than other configurations.

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Chong, Ian Ian. "Vibration control and genetic algorithm based design optimization on self-sensing active constrained layer damped rotating plates." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493698.

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Geng, Twzen-Shang. "Enhancement of the Dynamic Buckling Load and Analysis of Active Constrained Layer Damping with Extension and Shear Mode Piezoceramic Actuators." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27917.

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We consider geometric and material nonlinearities when studying numerically, by the finite element method, transient three-dimensional electroelastic deformations of a graphite-epoxy square plate sandwiched between two piezoceramic (PZT) layers. Points on the four edges of the bottom surface of the plate are restrained from moving vertically. The two opposite edges of the plate are loaded by equal in-plane compressive loads that increase linearly with time and the other two edges are kept traction free. The plate material is modeled as orthotropic and neoHookean. For the transversely isotropic PZT the second Piola-Kirchhoff stress tensor and the electric displacement are expressed as second degree polynomials in the Green-St. Venant strain tensor and the electric field. Both direct and converse piezoelectric effects are accounted for in the PZT. The plate is taken to have buckled when its centroidal deflection equals three times the plate thickness. The dynamic buckling load for the plate is found to strongly depend upon the rate of rise of the applied tractions. With the maximum electric field limited to 1kV/mm, the buckling load is enhanced by 18.3$\%$ when the PZT elements are activated. For a peak electric field of 30kV/mm, the buckling load increased by 58.5$\%$. When more than 60$\%$ of the surface area of the top and the bottom surfaces of the plate are covered by the PZT layers, then square PZT elements placed symmetrically about the plate centroid provide a larger enhancement in the buckling load than rectangular shaped or cross-shaped PZT elements. An increase in the plate thickness relative to that of the PZT actuators decreases the effectiveness of the PZT in enhancing the buckling load for the plate. The finite element code was modified to also analyze, in time domain, transient deformations of a viscoelastic material for which the second Piola-Kirchhoff stress tensor is expressed as a linear functional of the strain history of the Green-St. Venant strain tensor. It was used to analyze three-dimensional deformations of a thick laminated plate with layers made of aluminum, a viscoelastic material and a PZT. The following two arrangements of layers are considered. In one case a central PZT layer is surrounded on both sides by viscoelastic layers and aluminum layers are on the outside surfaces. The PZT is poled in the longitudinal direction and an electric field is applied in the thickness direction. Thus shearing deformations of the PZT layer are dominant. In the second arrangement, the aluminum layer is in the middle and the PZT layers are on the outside. The poling direction and the electric field are in the thickness direction; thus its extensional deformations are predominant. Three indices are used to gauge the damping of motion of plate particles, and the effectiveness of PZT actuators in enhancing this damping. It is found that the optimum thickness of the viscoelastic layers for maximum total energy dissipation is the same for each set-up. Also, the total thickness of the PZT layers which results in the maximum value of one of these indices of energy dissipation is the same for the two set-ups. Both arrangements give the largest value of this index for a plate of aspect ratio 10. Buckling behavior of a sandwich plate containing a soft core is also studied. The effects of the ratio of the elastic moduli of the outer layers to those of the core, and of the core thickness on the buckling load are analyzed. The top and the bottom layers are connected by very stiff blocks on two opposite edges where in-plane compressive time-dependent tractions are applied.<br>Ph. D.

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Huang, Yao-Hsin. "Some fundamental issues of constrained layer damping treatments /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7046.

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Al-Ajmi, Mohammed. "Homogenization and topology optimization of constrained layer damping treatments." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1537.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2004<br>Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Schultze, John Francis. "Evaluation of analytical and experimental methods to predict constrained layer damping behavior." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040317/.

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Sandin, Joakim. "Analysis Methods for Structures with Visco-Elastic Damping Treatment." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13250.

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During aircraft development, the impact of vibrations is examined and how this affects the aircraft structure under different conditions. Those vibrations can damage electronic equipment that are installed within the fuselage and can even lead to material fatigue within the structure. To reduce vibrations there are two approaches that are preferred to use, installing vibration insulators attached between the structure and the electrical component or change the design of the structure to a stiffer one. Those methods are easiest to implement in an early stage of the development but in later stages, when vibration problems usually are detected, it is too difficult and expensive to do major changes of the structure and there is lack of space to implement vibration insulators. A third method is then to apply passive damping in form of damper mats to surfaces on structures where critical vibrations occurs. The effects on the structural behavior when damper mats are applied to a certain structure are studied in this thesis work. The purpose is to get deeper knowledge about how damper mats can be used to reduce vibrations in aircraft structures. The type of damper mat that is studied is known as Constrained Layer Damping, CLD, which is a sandwich of a visco-elastic material layer and a stiffer constraining material layer. Modelling and simulation methods that are based on commercial FE-software have been developed. The analysis method is based on doing a modal analysis with structural damping taken into account. This makes it possible to predict the overall global damping at each structural mode. The models for damper mats have in this project been verified with experimental testing using typical damper mats. The methodology can be used to predict the behavior of damped structures in order to obtain an effective and lightweight passive damping solution.<br>Under utvecklingen av flygplan undersöks hur vibrationer påverkar flygplansstrukturen under olika förutsättningar. Dessa vibrationer kan skada elektronisk utrustning som är monterad i flygplanskroppen och kan även göra så att materialutmattning uppstår i flygplansstrukturen. För att motverka vibrationer finns det två metoder som är att föredra, antingen att montera vibrationsisolatorer mellan de elektroniska utrustningarna och strukturen eller att ändra designen på strukturer till en styvare. Dessa metoder är enkla att implementera i ett tidigt steg i utvecklingsprocessen men i senare steg, då vibrationsproblem ofta upptäcks, så är det för komplicerat och för dyrt att göra större ändringar på strukturen och så är det ont om plats för att kunna installera vibrations isolatorer. En tredje metod är istället att implementera passiv dämpning i form av dämpningsmattor på ytor av strukturen där kritiska vibrationer uppstår. Effekterna av det strukturella uppförandet när dämpningsmattor är applicerade på en viss struktur har studerats i det här examensarbetet. Syftet är att få en fördjupad kunskap om hur dämpningsmattor kan användas för att reducera vibrationer i flygplan strukturer. Den typ av dämpningsmatta som har studerats är känd som Constrained Layer Damping, CLD, vilken är en sandwich av ett visko-elastiskt lager samt ett styvare lager. Modellerings och simuleringsmetoder som är baserade på kommersiella FE-mjukvaror har utvecklats. Analysmetoderna är baserade på att utföra modalanalys tillsammans med strukturell dämpning. Detta möjliggör att förutse den övergripande dämpningen vid varje strukturell mod. Modellerna för dämpningsmattorna har i det här projektet verifierats med experimental testning av typiska dämpningsmattor. Metodiken kan användas till att prediktera beteendet av dämpade strukturer för att uppnå en effektiv och lättviktig passiv dämpningslösning.

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Bateman, Michael John. "Constrained viscoelastic layer damping of thick aluminum plates: design, analysis, and testing." Thesis, Monterey, California. Naval Postgraduate School, 1990. http://hdl.handle.net/10945/30674.

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Approved for public release, distribution is unlimited<br>Modern naval warfare has been increasingly dependent upon the acoustic silencing of the participants. Constrained viscoelastic layer damping of vibrating elements is one method which can be used to meet acoustic silencing goals. This paper considers constrained viscoelastic layer damping treatments applied to a thick aluminum plate, including single layer, double layer, a milled pocket plate, and a milled 'floating element' configuration. High modal damping values were obtained for each configuration. The Modal Strain Energy method, using finite element analysis to estimate modal loss factors, was investigated for use as a tool in constrained viscoelastic layer damping design. A comparison of experimentally measured frequency response and modal loss factors with those predicted by the modal strain energy method is presented to confirm the possible use of the modal strain energy method as a design tool.

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Books on the topic "Active constrained layer damping"

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Bateman, Michael John. Constrained viscoelastic layer damping of thick aluminum plates: Design, analysis and testing. Naval Postgraduate School, 1990.

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Nault, James Robert. Analytical and experimental investigation of constrained viscoelastic layer damping for a plate and shell model. 1988.

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Book chapters on the topic "Active constrained layer damping"

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Chetwynd, Daley, T. L. Lew, Keith Worden, and J. A. Rongong. "Damage Detection in an Aluminium Plate with an Active Constrained Layer Damping Treatment." In Damage Assessment of Structures VII. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-444-8.205.

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Saini, Paramdeep, Apoorv Pandhi, and A. K. Darpe. "An Experimental Study on the Use of Active Constrained Layer Damping for Thin Curved Smart Shell Structures." In Emboding Intelligence in Structures and Integrated Systems. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-13-3.309.

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Hamidzadeh, Hamid R., and Reza N. Jazar. "Constrained Layer Damping Treatment of Thick Cylindrical Structures." In Vibrations of Thick Cylindrical Structures. Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-75591-5_6.

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Collins, Trevor, and Kevin Kochersberger. "Constrained Layer Damping Test Results for Aircraft Landing Gear." In Structural Dynamics, Volume 3. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9834-7_28.

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Chen, Rong, and Haitao Luo. "Topology Optimization of Constrained Layer Damping Treatment Plate Under Harmonic Excitations." In Computational and Experimental Simulations in Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-44947-5_11.

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Zhonglong, Wang, Jiao Yinghou, and Chen Zhaobo. "Experiment Investigation of Constrained Layer Damping Used for Vibration Suppression of Railway Wheel." In Computational and Experimental Simulations in Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27053-7_108.

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Madeira, J., A. Araújo, C. M. Mota Soares, and C. A. Mota Soares. "Multiobjective optimization for vibration reduction in composite plate structures using constrained layer damping." In Insights and Innovations in Structural Engineering, Mechanics and Computation. CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-145.

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Yao, Jialing, and Zhihong Li. "Analytical Solution and Dynamic Response of the Active Shifting Double-Layer Vibration Isolation System." In Raising and Lowering Vibration Isolator via Asymmetric Damping Adjustment. CRC Press, 2025. https://doi.org/10.1201/9781003436027-5.

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Petrakov, Egor V., and Dmitry V. Balandin. "Active Damping of Transverse Vibrations of Console Beam by Piezoelectric Layer with Different Electrode Shapes." In Advanced Structured Materials. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22093-7_14.

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Thatigiri, Rama Rao, and Meera Saheb Koppanati. "Design and Optimization of Constrained Damping Layer Thickness of Aluminium Plate Structure at Various Wave Modes of Vibration." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4739-3_9.

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Conference papers on the topic "Active constrained layer damping"

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AGNES, GREGORY, and KEVIN NAPOLITANO. "ACTIVE CONSTRAINED LAYER VISCOELASTIC DAMPING." In 34th Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-1702.

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Chen, Tung-Huei, and Amr M. Baz. "Performance characteristics of active constrained layer damping versus passive constrained layer damping with active control." In 1996 Symposium on Smart Structures and Materials, edited by Vasundara V. Varadan and Jagdish Chandra. SPIE, 1996. http://dx.doi.org/10.1117/12.240804.

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Baz, A., and S. Poh. "Active Constrained Layer Damping of Seismic Excitations." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0632.

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Abstract This paper aims at demonstrating the feasibility of Active Constrained Layer Dampers (ACLD) as an effective means for damping out seismic-induced vibrations of structures. The ACLD concept is motivated by the destructive effects that seismic excitations have on most of the uncontrolled structures. The effectiveness of the ACLD in enhancing the damping characteristics of conventional visco-elastic dampers is demonstrated experimentally for structures subjected to base excitations. Classical identification methods are used to identify a mathematical model that describes the interaction between the vibrating structures, the ACLD system and the seismic excitation. The model is integrated with a robust Continuous Sliding Mode (CSM) controller to reject the effect of the seismic excitations acting on vibrating structures with uncertain dynamic parameters. In this manner, the ACLD and the CSM algorithm present a simple but yet powerful alternative to classical control methods for rejecting seismic excitations and accommodating wide range of parameter uncertainty. The emphasis, in this paper, is placed on multi-story two-dimensional scaled structures which are provided with diagonal braces of the ACLD. However, the techniques developed can be readily extended to three-dimensional and larger structures.

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Baz, Amr M., and Jeng-Jong Ro. "Performance characteristics of active constrained-layer damping." In 1994 North American Conference on Smart Structures and Materials, edited by Conor D. Johnson. SPIE, 1994. http://dx.doi.org/10.1117/12.174089.

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Baz, Amr M. "Robust control of active constrained layer damping." In 1996 Symposium on Smart Structures and Materials, edited by Conor D. Johnson. SPIE, 1996. http://dx.doi.org/10.1117/12.239090.

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Kapadia, Rajiv K., and Grzegorz Kawiecki. "Experimental Evaluation of Segmented Active Constrained Layer Damping Treatments." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0927.

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Abstract The objective of this research is to demonstrate the feasibility of segmented Active Constrained Layer Damping treatments to improve low frequency vibrations damping in flexible robotic arms. The Active Constrained Layer Damping treatment, under consideration, consists of a viscoelastic layer sandwiched between two piezoelectric layers. The shear deformation of the viscoelastic layer causes loss of energy and thus damping of vibration. This paper focuses on the effects of constraining layer segmentation. Experimental results obtained for slender beams partially treated with segmented and unsegmented Active Constrained Layer Damping treatments are presented. Tested specimens have low natural frequencies, typical for flexible robotic manipulator arms. The performance of segmented and unsegmented treatments, as well as the performance of active and passive treatments is compared. Presented results demonstrate that significant improvement in Active Constrained layer treatment performance can be achieved by an appropriate segmentation of the constraining layer.

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Shen, I. Y. "Intelligent Constrained Layer: An Innovative Approach." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0161.

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Abstract This paper is to propose an innovative damping design termed intelligent constrained layer (ICL). This technique integrates active and passive dampings through constrained layer treatments to enhance system reliability and to provide adjustable damping. The proposed ICL damping design consists of a viscoelastic shear layer sandwiched between a piezoelectric constraining cover sheet and the structure to be dampened. According to measured vibration response of the structure, a feedback controller regulates axial deformation of the piezoelectric layer to perform active vibration control. In the meantime, the viscoelastic shear layer provides additional passive damping. The active damping component of this design will produce adjustable and significant damping. The passive damping component of this design will increase gain and phase margins, eliminate spillover, reduce power consumption, improve robustness and reliability of the system, and reduce vibration response at high frequency ranges where active damping is difficult to implement. To model the dynamics of ICL, an eighth-order differential equation governing bending vibration of an elastic beam with the ICL treatment is first derived. Then an ICL treatment using an idealized, distributed sensor and a proportional-plus-derivative feedback controller is illustrated on a semi-infinite elastic beam subjected to standing wave excitations. Numerical results show that ICL will produce significant damping. The allowable deflection slope of the beam in order not to saturate the piezoelectric layer is also calculated.

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Van Nostrand, William C., and Daniel J. Inman. "Finite element model for active constrained layer damping." In Symposium on Active Materials and Smart Structures: Society of Engineering Science 31st Annual Meeting, edited by Gary L. Anderson and Dimitris C. Lagoudas. SPIE, 1995. http://dx.doi.org/10.1117/12.200912.

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Nath, Subhobroto, and Norman Wereley. "Active constrained layer damping for rotorcraft flex beams." In 36th Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-1100.

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Austin, Eric M., Daniel J. Inman, and S. C. Huang. "Design considerations for active constrained layer damping treatments." In 1996 Symposium on Smart Structures and Materials, edited by Vasundara V. Varadan and Jagdish Chandra. SPIE, 1996. http://dx.doi.org/10.1117/12.240803.

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Reports on the topic "Active constrained layer damping"

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Dubbelday, Pieter S. Analysis of Constrained-Layer Damping of Flexural and Extensional Waves in Infinite, Fluid-Loaded Plates. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada247936.

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