scholarly journals Random Vibration Suppression of a Truss Core Sandwich Panel Using Independent Modal Resonant Shunt and Modal Criterion

2017 ◽  
Vol 7 (5) ◽  
pp. 496 ◽  
Author(s):  
Kongming Guo ◽  
Yalan Xu
Keyword(s):  
Random Vibration ◽  
Sandwich Panel ◽  
Vibration Suppression ◽  
Truss Core ◽  
Resonant Shunt

Bending and free vibration analysis of foam-filled truss core sandwich panel

2016 ◽  
Vol 20 (5) ◽  
pp. 617-638 ◽  
Author(s):  
MP Arunkumar ◽  
Jeyaraj Pitchaimani ◽  
KV Gangadharan
Keyword(s):  
Free Vibration ◽  
Vibration Analysis ◽  
Sandwich Panel ◽  
Closed Form Solution ◽  
Free Vibration Analysis ◽  
Element Model ◽  
Form Solution ◽  
Numerical Comparison ◽  
Truss Core ◽  
Foam Filled

This paper presents the studies carried out on bending and free vibration behavior of truss core sandwich panel filled with foam typically used in aerospace applications. Equivalent stiffness properties for foam-filled truss core sandwich panel are derived by idealizing 3D foam-filled sandwich panel to an equivalent 2D orthotropic thick plate continuum. The accuracy of the derived elastic property is ensured by the numerical comparison of free vibration response of 3D and its equivalent 2D finite element model. The derived stiffness constants were used in closed form solution to evaluate the maximum deflection of the continuum. The results show that the free vibration and static behavior of the sandwich panel can be enhanced in due consideration to the space constraint by filling foam in the empty space of core. The results also reveal that triangular core foam-filled sandwich panel deflects less compared to other cores. From the free vibration analysis, effect of filling foam is effective in cellular and trapezoidal core.

Vibration Suppression Using Electromagnetic Resonant Shunt Damper

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Tsuyoshi Inoue ◽  
Yukio Ishida ◽  
Masaki Sumi
Keyword(s):  
Optimal Design ◽  
Experimental Analysis ◽  
Vibration Suppression ◽  
Mechanical Energy ◽  
Voice Coil Motor ◽  
Electrical Energy ◽  
Electromagnetic Actuator ◽  
Resonant Shunt ◽  
Shunt Circuit

An electromagnetic actuator has the property to convert mechanical energy to electrical energy and vice versa. In this study, an electromagnetic resonant shunt damper, consisting of a voice coil motor with an electric resonant shunt circuit, is proposed. The optimal design of the shunt circuit is obtained theoretically for this electromagnetic resonant shunt damper. Furthermore, the effects of parameter errors of the elements of the electromagnetic resonant shunt damper are also investigated. The applicability of the theoretical findings for the proposed damper is justified by the experimental analysis.

Effect of longitudinal deformation on wave propagation in truss core sandwich panel

2020 ◽  
pp. 095745652096488
Author(s):  
Sun Liang ◽  
Xiao Yougang
Keyword(s):  
Transverse Direction ◽  
Sandwich Panel ◽  
Sandwich Panels ◽  
Theoretical Models ◽  
The Other ◽  
Full Model ◽  
Longitudinal Deformation ◽  
Compressive Wave ◽  
High Frequencies ◽  
Truss Core

The longitudinal deformation has been ignored by most previous study on vibroacoustic behaviours of truss core sandwich panels. This paper investigates its effect by developing two theoretical models. One, named as full model, considers both flexural and longitudinal deformation of face sheets while the other, named as flexural model, incorporates only flexural deformation. By comparing free characteristic waves obtained from two models, one find that flexural model ignore two waves, that is, a compressive wave and a global flexural one. The ignored waves cause vibration in transverse direction even at high frequencies, and thus result in vibration peaks under forced vibration. Therefore the flexural model would underestimate the vibration response, and the longitudinal deformation of face sheets cannot be ignored during dynamic analysis of the sandwich panels.

Simultaneous Vibration Mitigation and Energy Harvesting for a Nonlinear Oscillator

2020 ◽  
Author(s):  
Paul Kakou ◽  
Oumar Barry
Keyword(s):  
Energy Harvesting ◽  
Nonlinear Oscillator ◽  
Vibration Suppression ◽  
Tuned Mass Damper ◽  
Maximum Energy ◽  
Superior Performance ◽  
Design Parameters ◽  
Vibration Mitigation ◽  
Mass Damper ◽  
Resonant Shunt

Abstract Considerable attention has been recently given to electromagnetic resonant shunt tuned mass damper-inerter (EH-TMDI) for simultaneous vibration mitigation and energy harvesting. However, only linear structures have been investigated. Hence, in this paper, we aim at simultaneously achieving vibration mitigation and energy harvesting for nonlinear oscillators. To do so, we attach a nonlinear electromagnetic resonant shunt tuned mass damper-inerter (NEH-TMDI) to a single degree of freedom nonlinear oscillator (Duffing Oscillator). The nonlinear oscillator is coupled to the tuned mass damper via a linear and a nonlinear spring. Both the electromagnetic and the inerter devices are grounded on one side and connected to the nonlinear vibration absorber on the other side. This is done so to relax the trade off between energy harvesting and vibration suppression. The electromagnetic transducer is shunted to a resistor-inductor circuit. The governing equations of motion are derived using Newton’s method. Numerical simulations are carried out to examine the performance of the proposed NEH-TMDI. Comprehensive parametric analyses are conducted to identify the key design parameters that render the best performance of the NEH-TMDI. The results show that selected parameters offer regions were maximum energy dissipated and maximum energy harvested coincide. The findings are very promising and open a horizon of future opportunities to optimize the design of the NEH-TMDI for superior performance.

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