&lt;title&gt;Structural design for dynamic loading using a biomimetic approach&lt;/title&gt;

Wardle, Robin; Tomlinson, G.R.

doi:10.1117/12.267117

Cited by 4 publications

(3 citation statements)

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“…where e* is ratio E2*/E1 (with E 2 * the storage modulus of the VEM), and h = H 1 /H 2 is the ratio between thickness (H 1 and H 2 are respectively the thickness of the plate and of the viscoelastic layer). The stiffness matrix of the hybrid element is similar to that of the classical Kirchoff's plate element (Wardle and Tomlinson, 1997), in which the stiffness terms (E 1 I 1 ) have to be substituted by the corresponding complex terms (EI)* obtained by the Oberst approximated theory (equation ( 1)). The mass matrix is modified only by increasing the density of the material in order to take into account the presence of the viscoelastic layer.…”

Section: Finite Element Formulation For the Free Layer Dampingmentioning

confidence: 99%

“…Partial or complex patterned damping patches at selected locations are therefore more desirable than a full covering layer. Topology and cellular automaton optimization applied to damping treatment surfaces (Chia et al 2008;Lumsdaine 2002;Wardle and Tomlinson, 1997) lead to irregular and complex-patterned final shapes of the CLD and/or FLD coatings.…”

Section: Introductionmentioning

confidence: 99%

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Modal strain energy based methods for the analysis of complex patterned free layer damped plates

Curá

Mura

Scarpa

2011

Journal of Vibration and Control

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The aim of this work is to study the modal behavior of structures covered with a complex pattern of viscoelastic material in Free Layer Damping (FLD) configuration in terms of damping performances. Two original methods based on the Modal Strain Energy (MSE) method named New Modified MSE method and the Corrected MSE method have been developed and applied to some test cases. A comparison between the new methods and the classic one has been done. Different viscoelastic distributions have been analyzed in order to evaluate how the patch design may influence the damping performances of the coupled structure. The structure has been discretized by means of a hybrid Finite Element (FE) developed to simulate the structure with the FLD viscoelastic treatment. The hybrid FE element has been benchmarked against an analytical example with full FLD coverage.

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Section: Finite Element Formulation For the Free Layer Dampingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modal strain energy based methods for the analysis of complex patterned free layer damped plates

Curá

Mura

Scarpa

2011

Journal of Vibration and Control

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“…Thus, by mimicking the evolution of the biological phenomena, it is possible for CA to drive a physical system towards its optimum. For example, Wardle and Tomlinson [15] used CA, inspired by cell growth in living organisms to locate a free layer damping coating on a vibrating plate in a more efficient manner. As the optimum location of a free layer coating is dictated by the surface strain on the host structure, its optimization is therefore reasonably intuitive.…”

Section: Introductionmentioning

confidence: 99%

Evolution of constrained layer damping using a cellular automaton algorithm

Chia

Rongong

Worden

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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Constrained layer damping (CLD) is a highly effective passive vibration control strategy if optimized adequately. Factors controlling CLD performance are well documented for the flexural modes of beams but not for more complicated mode shapes or structures. The current paper introduces an approach that is suitable for locating CLD on any type of structure. It follows the cellular automaton (CA) principle and relies on the use of finite element models to describe the vibration properties of the structure. The ability of the algorithm to reach the best solution is demonstrated by applying it to the bending and torsion modes of a plate. Configurations that give the most weight-efficient coverage for each type of mode are first obtained by adapting the existing 'optimum length' principle used for treated beams. Next, a CA algorithm is developed, which grows CLD patches one at a time on the surface of the plate according to a simple set of rules. The effectiveness of the algorithm is then assessed by comparing the generated configurations with the known optimum ones.

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Strategies for using cellular automata to locate constrained layer damping on vibrating structures

Chia

Rongong

Worden

2009

Journal of Sound and Vibration

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It is often hard to optimise constrained layer damping (CLD) for structures more complicated than simple beams and plates as its performance depends on its location, the shape of the applied patch, the mode shapes of the structure and the material properties. This paper considers the use of cellular automata (CA) in conjunction with finite element analysis to obtain an efficient coverage of CLD on structures. The effectiveness of several different sets of local rules governing the CA are compared against each other for a structure with known optimum coverage -namely a plate. The algorithm which attempts to replicate most closely known optimal configurations is considered the most successful. This algorithm is then used to generate an efficient CLD treatment that targets several modes of a curved composite panel. To validate the modelling approaches used, results are also presented of a comparison between theoretical and experimentally obtained modal properties of the damped curved panel.

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<title>Structural design for dynamic loading using a biomimetic approach</title>

Cited by 4 publications

References 0 publications

Modal strain energy based methods for the analysis of complex patterned free layer damped plates

Modal strain energy based methods for the analysis of complex patterned free layer damped plates

Evolution of constrained layer damping using a cellular automaton algorithm

Strategies for using cellular automata to locate constrained layer damping on vibrating structures

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