Dynamic Behaviour Adaptation of Lightweight Structures by Compressible Constrained Layer Damping with Embedded Polymeric Foams and Nonwovens

Abstract

Evanescent morphing in combination with an original concept of Compressible Constrained Layer Damping (CCLD) is a novel and promising approach for dynamic behaviour adaptation. The crucial component of the CCLD is a compressible intermediate layer with its thickness and material properties controlled by fluid actuation, enabling the adjustment of the damping and stiffness of the overall system. To estimate the potential of the CCLD, an analytical model was developed which describes the vibration behaviour of the overall structure, taking into account the compression-driven properties of the intermediate layer. The results confirm the principal correctness of the initial theoretical assumptions regarding the adaptive dynamic behaviour of structures with CCLD treatment. A significant vibration mitigation as well as a high adaptability of dynamic behaviour were observed, however, they show a complex dependence on the system configuration. Nevertheless, the developed analytical modelling approach can already be used for a preliminary system design. Besides the analysed polymer-based foams as the intermediate layer, nonwovens also exhibit compression-dependent shear properties and can therefore be used in CCLD. First preliminary investigations show that the damping performance is on average about ten times better than that of the polymeric foams.

Editorial for Special Issue “Energy Dissipation and Vibration Control: Materials, Modeling, Algorithm, and Devices”

“…This special issue also reports other types of new energy dissipation devices, such as a multi-unit particle damper [34], a nonlinear eddy current damper [35], and layered dampers [36,37]. Furthermore, also reported in this issue are structural elements with innovative designs to dissipate energy [38][39][40].…”

“…In summary, the topics in the special issue include new damping materials development [37], new damper vibration modeling, novel algorithms for active vibration control [44,45], novel passive damping methods and devices [25][26][27][28][29][30], innovative energy dissipation devices [38][39][40], and an explorative characterization of materials for energy dissipation [33], among others. For the future trends of research in energy dissipation for vibration control, two avenues should be noted.…”

Experimental Study on Mechanical Properties of Small Size Viscoelastic Damper

“…The contribution of elastic component to deformation is studies as shear storage modulus (S S ) while contribution from Viscous component is studies as shear loss modulus(S L ). Simply, shear storage and shear loss modulus significantly affect the damping performance of viscoelastic dampers [12]. For clinical application, it is very important to know the response behavior of viscoelastic material (specifically shear storage, shear loss and loss factor) at a corresponding loading rate and temperature [13] The strain of a viscoelastic body is out of phase with the stress applied, by the phase angle, δ [18].…”

Sound Transmission Loss of a Sandwich Plate with Adjustable Core Layer Thickness

“…For the adaptation of the dynamic behaviour, the authors have already proposed an original concept of Compressible Constrained Layer Damping (CCLD) in previous publications [ 15 , 16 , 17 , 18 ]. CCLD is an extension of the well-known Constrained Layer Damping (CLD) design, where the usually incompressible viscoelastic damping layer, is replaced by a compressible one, which is able to undergo compression and expansion in thickness direction.…”