Damping Behavior of Aluminum Replicated Foam

2018 ◽  
pp. 33-40
Author(s):  
W. Riehemann ◽  
A. Finkelstein ◽  
U. Arlic ◽  
D. Husnullin
Keyword(s):  
Damping Behavior

scholarly journals Damping prediction of particle dampers for structures under forced vibration using effective fields

2021 ◽  
Vol 23 (3) ◽  
Author(s):  
Niklas Meyer ◽  
Robert Seifried
Keyword(s):  
Energy Dissipation ◽  
Knowledge Exchange ◽  
Underlying Structure ◽  
Reduction Techniques ◽  
Linear Behavior ◽  
Damping Behavior ◽  
Effective Particle ◽  
Coupling Procedure ◽  
Particle Damping ◽  
Particle Dampers

AbstractParticle damping is a promising damping technique for a variety of technical applications. However, their non-linear behavior and multitude of influence parameters, hinder currently its wide practical use. So far, most researchers focus either on determining the energy dissipation inside the damper or on the overall damping behavior when coupled to a structure. Indeed, currently almost no knowledge exchange between both approaches occurs. Here, a bridge is build to combine both techniques for systems under forced vibrations by coupling the energy dissipation field and effective particle mass field of a particle damper with a reduced model of a vibrating structure. Thus, the overall damping of the structure is estimated very quickly. This combination of both techniques is essential for an overall efficient dimensioning process and also provides a deeper understanding of the dynamical processes. The accuracy of the proposed coupling method is demonstrated via a simple application example. Hereby, the energy dissipation and effective mass of the particle damper are analyzed for a large excitation range first using a shaker setup. The particle damper exhibits multiple areas of different efficiency. The underlying structure is modeled using FEM and modal reduction techniques. By coupling both parts it is shown that multiple eigenmodes of the structure are highly damped using the particle damper. The damping prediction using the developed coupling procedure is validated via experiments of the overall structure with particle damper.

Vibration damping behavior of flexible polyurethane foams under low and high strain regimes

2019 ◽  
pp. 273-291
Author(s):  
Mark Brennan ◽  
Martino Dossi ◽  
Yueqi Wang ◽  
Maarten Moesen ◽  
Jan Vandenbroeck
Keyword(s):  
High Strain ◽  
Polyurethane Foams ◽  
Vibration Damping ◽  
Damping Behavior ◽  
Flexible Polyurethane

Effects of Macroscopic Pores on the Damping Behaviors of Metal Materials

2011 ◽  
Vol 66-68 ◽  
pp. 1155-1162
Author(s):  
Jian Ning Wei ◽  
Gen Mei Li ◽  
Li Ling Zhou ◽  
Xue Yun Zhou ◽  
Jian Min Yu ◽  
...  
Keyword(s):  
Internal Friction ◽  
Pure Aluminum ◽  
Air Pressure ◽  
Damping Capacity ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Temperature Range ◽  
Commercially Pure ◽  
Damping Behavior ◽  
Metal Materials

A large number of macroscopic pores were introduced into commercially pure aluminum (Al) and Zn-Al eutectoid alloy by air pressure infiltration process to comparatively study the influence of macroscopic pores on the damping behaviors of the materials. Macroscopic pores size are on the order of a millimetre (0.5~1.4mm) and in large proportions, typically high 76vol.%. The damping behavior of the materials is characterized by internal friction (IF). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400 °C, while continuously changing temperature. The damping capacity of the metal materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the metal materials with macroscopic pores were discussed in light of IF measurements.

Damping behavior of implant-supported restorations

2011 ◽  
Vol 24 (2) ◽  
pp. 143-148 ◽  
Author(s):  
Pascal Magne ◽  
Michael Silva ◽  
Elisa Oderich ◽  
Luis Leonildo Boff ◽  
Reyes Enciso
Keyword(s):  
Damping Behavior

scholarly journals Damping behavior of synthetic graphite beams

2006 ◽  
Vol 9 (2) ◽  
pp. 193-197 ◽  
Author(s):  
Luiz Cláudio Pardini ◽  
Flaminio Levy Neto ◽  
Jorge Luiz de Almeida Fereira
Keyword(s):  
Damping Behavior ◽  
Synthetic Graphite

The Nonlinear Roll Damping of a FPSO Hull

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Allan C. de Oliveira ◽  
Antonio Carlos Fernandes
Keyword(s):  
Nonlinear Damping ◽  
Challenging Problem ◽  
Roll Damping ◽  
Ship Hulls ◽  
Damping Behavior ◽  
Industry Standards ◽  
Long Time ◽  
Technological Developments ◽  
Traditional Approaches ◽  
The 19Th Century

The ship-rolling problem is a subject that has been studied for a long time. Since Froude's time (in the 19th century) to nowadays, this subject was revisited several times in order to adjust the theory to changes in ship hulls, dimensions, materials, appendages, etc. On the other hand, ship analysis technological resources, including both experimental techniques and computational capacity (that did not exist in Froude's time), have also amazingly improved. But despite all those technological developments, the assessment of the nonlinear roll damping of some types of hulls still is a challenging problem. The floating production storage and offloading (FPSO) hull fitted with larger bilge keels, for instance, has behaved in such a way that it is impossible to obtain results from nowadays industry standards via decaying tests. This paper discusses an alternative way to assess the nonlinear damping behavior of FPSO hulls with large bilge keels. Since it is fairly easy to perform decaying tests, the paper also proposes an alternative way to analyze the FPSO properties through this kind of testing by grouping multiple results instead of using only a single test. This artifice brought improvements, such as an increased agreement between the alternative model and the experimental data. The paper also compares the more traditional approaches with the alternative method and finally shows the latter's applicability.

Determining the damping behavior of fiber reinforced composites

2013 ◽  
Vol 100 ◽  
pp. 34-39 ◽  
Author(s):  
Lars Ulke-Winter ◽  
Matthias Klaerner ◽  
Lothar Kroll
Keyword(s):  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Damping Behavior

Synergy of fiber length and content on free vibration and damping behavior of natural fiber reinforced polyester composite beams

2014 ◽  
Vol 56 ◽  
pp. 379-386 ◽  
Author(s):  
K. Senthil Kumar ◽  
I. Siva ◽  
P. Jeyaraj ◽  
J.T. Winowlin Jappes ◽  
S.C. Amico ◽  
...  
Keyword(s):  
Free Vibration ◽  
Fiber Length ◽  
Natural Fiber ◽  
Composite Beams ◽  
Fiber Reinforced ◽  
Damping Behavior ◽  
Polyester Composite
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