StudentShare solutions

# Characterization models of poroelastic materials: A review - Research Paper Example

## Extract of sampleCharacterization models of poroelastic materials: A review

This paper reviews several characterization models of poroelastic materials. Both theoretical and numerical models such as empirical, phenomenological, finite element models, etc. are discussed. The aim is to provide a brief description and review of the various characterization models presently in existence. 3.2 Theoretical Modeling The determination of the sound absorption properties may be differentiated into three kinds, namely – empirical, microstructural and phenomenological models (Bo & Tianning 2009). These are discussed as follows: 3.2.1 Empirical Models One of the first empirical models for determining properties of poroelastics is the one given by Delany and Bazley (1969). This model estimates the impedance of the material assuming that the material is a rigid skeleton (Sagartzazu, Hervella-Nieto, & Pagalday 2008). Other such models also exist that make the same rigid skeleton assumption, and they are also known as equivalent fluid models because according to them, the porous material has high stiffness towards the fluid medium (Sagartzazu, Hervella-Nieto, & Pagalday). Other models also exist that take movements in both, the skeleton and the fluid, into account. These theoretical models are more complete and are based on many parameters belonging to both the fluid and the skeleton of the material. The empirical models are generally used for the estimation of the complex propagation constant and the impedance using the knowledge of the material’s secondary properties (Sagartzazu, Hervella-Nieto, & Pagalday). The Delany-Bazley model is the most representative model among the various empirical models for characterization of poroelastics. This model is based on numerous impedance tube measurements and is good for determining the propagation constant and characteristic impedance at frequencies higher than 250 Hz but not at low frequencies (Rey et al. 2012; Fouladi, Ayub, & Nor 2011). This is a simple model based on the flow resistivity of the material (Kidner & Hansen 2008). The validity of this model for lower and higher frequencies was further extended by Bies and Hansen, to which further improvements were made by other investigators (Rey et al.). Bies and Hansen demonstrated that apart from flow resistivity, the linear relationship between bulk density and flow resistivity of the material is also important (Kidner & Hansen). They combined the empirical formulae from the Delany and Bazley model with those of Morse in their theoretical predictions for porous materials. Other empirical models include those of Allard and Champoux (1992 cited in Sagartzazu, Hervella-Nieto, & Pagalday 2008). This model works on the assumption that the thermal effects are dependent on frequency. The model works well for low frequencies. The Mechel-Ver Model also works well at low frequencies, unlike the Delany-Bazley model (Sagartzazu, Hervella-Nieto, & Pagalday). The Voronina model is another simple model that is based on the porosity of a material (Rey et al.). This model uses the average pore diameter, frequency and porosity of the material for defining the acoustical characteristics of the material. Voronina (1999 I) further extended the empirical model developed for porous materi ...Show more

## Summary

Characterization Models of Poroelastic Materials: A Review 3.1 Background The analysis, prediction and characterization of the acoustical behaviour and properties of poroelastic materials are of extreme importance in order to enable their appropriate utilization in various industries…
Author : bmclaughlin
Save Your Time for More Important Things
Let us write or edit the research paper on your topic
"Characterization models of poroelastic materials: A review"
with a personal 20% discount.
Grab the best paper

### Related Essays

Characterization in A Farewell to Arms
and its universal appeal has received a unique dimension through A Farewell to Arms (1929). The story deals with the same theme of immortality of love no matter how adverse or hostile the situation is. His semi-autobiographical work centered on his romantic involvement with a nurse during his work with Milan hospital.
7 pages (1750 words) Research Paper
Acoustical Characterization of Porous Materials for Automotive Application
Acoustical Characterization of Porous Materials for Automotive Application: A Review Abstract This review mainly concerns itself with the acoustic characteristics of porous materials in various automotive applications. The porous materials in question include; artificial and natural fiber, porous material and polymer foams.
7 pages (1750 words) Research Paper
The thin film materials
In general thickness of thin films is less than microns. These films are different from thick films. Throughout history, these films have been utilized for more than a half century for constructing different electronic components. These films are also used for the coating of different optical instruments, decoration of different parts and for coatings of hard materials.
8 pages (2000 words) Research Paper
Book Review - Integrative Approaches to Psychology and Christianity: An Introduction to Worldview Issues, Philosophical Foundations, and Models of Integration
Entwistle writes in his book Integrative Approaches Psychology and Christianity: An Introduction to Worldview Issues, Philosophical Foundations, and Models of Integratio, he doesn’t just write, he elaborates and clears confusion for those who are in conflict with religion (Christianity in particular) and for those who are searching for the truth, in an attempt to integrate religion and psychology.
5 pages (1250 words) Research Paper
Materials Engineering Project
As discussed in this paper, titanium alloy exhibits high degree of tensile strength, low weight, and high resistance to corrosion, thermal strength and ease of fabrication at extreme temperatures. However, titanium is highly susceptible to dry chlorine gas, hypochlorite and reducing acids thus limits its production and uses.
5 pages (1250 words) Research Paper
NMR Characterization of Nylon 6
This level of magnification is not possible with the other methods. They are also able to provide molecular level explanation for the transition states of the molecules including
10 pages (2500 words) Research Paper
Characterization in A Farewell to Arms
Amongst the different characters in the novel, the major characters comprise the “foreground” and the other significant but minor characters are a part of the “background” of the story.
8 pages (2000 words) Research Paper
Hazardous materials
They are also associated with the pollution of the environment. A hazardous material is defined as a substance that threatens to harm the environment or the public health. In the US, the treatment, disposal and storage of hazardous material is
10 pages (2500 words) Research Paper
Types of composite materials
There should be at least one portion of each in order to make a composite material. The matrix surrounds the reinforcement material in the composite; therefore acting as a supporting agent. The reinforcement material on the other hand
6 pages (1500 words) Research Paper
Domestic materials compactor
This makes it ideal for kitchen usage where a single can and rarely as many as 60 are used at the same time. Its production is rather interesting ad takes into consideration multiple aspects. These include aesthetic finish which is
2 pages (500 words) Research Paper
Get a custom paper written
by a pro under your requirements!
Win a special DISCOUNT!
Put in your e-mail and click the button with your lucky finger