Measurement of wave propagation power flow in structures

1988 ◽  
Vol 84 (6) ◽  
pp. 2303-2303
Author(s):  
William Redman‐White
Keyword(s):  
Wave Propagation ◽  
Power Flow ◽  
Propagation Power

Wave propagation, power flow, and resonance in a truss beam

1988 ◽  
Vol 126 (1) ◽  
pp. 127-144 ◽  
Author(s):  
J. Signorelli ◽  
A.H. von Flotow
Keyword(s):  
Wave Propagation ◽  
Power Flow ◽  
Propagation Power

Wave Propagation and Power Flow Analysis of Sandwich Structures With Internal Absorbers

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
J. S. Chen ◽  
R. T. Wang
Keyword(s):  
Wave Propagation ◽  
Power Flow ◽  
Wave Attenuation ◽  
Sandwich Structures ◽  
Flow Analysis ◽  
Flow Characteristics ◽  
Continuum Models ◽  
Sandwich Beams ◽  
The Core ◽  
In Series

This study examines wave attenuation and power flow characteristics of sandwich beams with internal absorbers. Two types of absorbing systems embedded in the core are considered, namely, a conventional spring-mass-dashpot system having a mass with a spring and a dashpot in parallel, and a relaxation system containing an additional relaxation spring added in series with the dashpot. Analytical continuum models used for interpreting the attenuation behavior of sandwich structures are presented. Through the analysis of the power flowing into the structure, the correlation of wave attenuation and energy blockage is revealed. The reduction in the power flow indicates that some amount of energy produced by the external force can be effectively obstructed by internal absorbers. The effects of parameters on peak attenuation, bandwidth, and power flow are also studied.

An Investigation of Vibrational Power Flow in One-Dimensional Dissipative Phononic Structures

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
H. Al Ba'ba'a ◽  
M. Nouh
Keyword(s):  
Wave Propagation ◽  
Power Flow ◽  
Vibration Suppression ◽  
Wave Attenuation ◽  
External Disturbance ◽  
Stop Band ◽  
Bragg Scattering ◽  
Spatial Propagation ◽  
The Individual ◽  
Vibrational Power Flow

Owing to their ability to block propagating waves at certain frequencies, phononic materials of self-repeating cells are widely appealing for acoustic mitigation and vibration suppression applications. The stop band behavior achieved via Bragg scattering in phononic media is most commonly evaluated using wave propagation models which predict gaps in the dispersion relations of the individual unit cells for a given frequency range. These models are in many ways limited when analyzing phononic structures with dissipative constituents and need further adjustments to account for viscous damping given by complex elastic moduli and frequency-dependent loss factors. A new approach is presented which relies on evaluating structural intensity parameters, such as the active vibrational power flow in finite phononic structures. It is shown that the steady-state spatial propagation of vibrational power flow initiated by an external disturbance reflects the wave propagation pattern in the phononic medium and can thus be reverse engineered to numerically predict the stop band frequencies for different degrees of damping via a stop band index (SBI). The treatment is shown to be very effective for phononic structures with viscoelastic components and provides a clear distinction between Bragg scattering effects and wave attenuation due to material damping. Since the approach is integrated with finite element methods, the presented analysis can be extended to two-dimensional lattices with complex geometries and multiple material constituents.

Full Electromechanical Optimization of Shunted Piezoelectric Patch for Controlling Elastodynamic Waves’ Power Flow

2012 ◽  
Author(s):  
Flaviano Tateo ◽  
Tianli Huang
Keyword(s):  
Wave Propagation ◽  
Dynamic Behavior ◽  
Power Flow ◽  
Real Life ◽  
Design Parameters ◽  
Actual System ◽  
Energy Diffusion ◽  
Proper Design ◽  
Large Frequency ◽  
Diffusion Properties

Wave propagation and energy diffusion in smart structures with shunted piezoelectric patches are examined in this study. The dynamic behavior of a structure can be modified through piezoelectric shunts with negative capacitance. This technique is extremely interesting, as it controls the dynamic behavior of the structure in a large frequency range. The effects of this piezoelectric shunt are studied via a wave propagation approach, and energy diffusion properties of specific wave modes in the structure can be obtained. However, for a proper design of the overall structure, a finer analysis of the real-life circuit is required. The aim of the present work is indeed to establish some essential rules that will guide one to choose more suitable design parameters for the actual system.

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