Further examples of use of FEA occur in the case studies ( Chapters 9, 13, 14, 16, and 21) and the analysis of foam indentation ( Chapter 15). Experiments to validate the models will be critically examined. This chapter explores the background to foam material models in FEA other aspects of FEA are covered in texts such as Shames and Dym (1985). NJ Mills, in Polymer Foams Handbook, 2007 6.1.1 FEA packagesįinite element analysis (FEA) is used to find the stress distribution for complex geometries. These unique capabilities make the EFEA method a powerful simulation tool for design and analysis. These advantages include the generation of the numerical model based on geometry spatial variation of the damping properties can be considered within a particular structural member the excitation can be applied at discrete locations on the model, and EFEA can be applied to the high frequency range, which benefits the large community of FEA users. There are several advantages offered by EFEA. It is based on deriving governing differential equations in terms of energy density variables and employing a finite element approach for solving them numerically. In contrast, EFEA offers an improved alternative formulation to the SEA for simulating the structural-acoustic behavior of built-up structures. It can be easily applied to irregular domains and geometries that are composed of different materials or mixed boundary conditions.Īlthough SEA models result in a few of equations which are easy to solve, they cannot be developed from CAD data, local damping cannot be accounted for, and the model development requires specialized knowledge. Due to the utilization of the finite element technique, EFEA also has the other advantages that traditional FEM does not have. The postprocessing of EFEA results also provides straight-forward visualization of the energy flow in a system, which is convenient for diagnoses and control of noise propagation.ĮFEA can be applied to model highly damped or nonuniformly damped materials, and to model distributed masses as well as multipoint power input.

The prediction of a spatially varying energy level within a structural subsystem is available with the EFEA computation. This permits modeling flexibility and cost-saving as one FE model can be applied to both low and high frequency analysis. The EFEA is compatible with low frequency FEM models since it can use an FEM database. The primary variable in EFEA is defined as the time averaged energy density over a period and space averaged energy density over a wavelength. The EFEA applies finite element discretization to solve the governing differential energy equations. Laith Egab, in Automotive Tire Noise and Vibrations, 2020 10.2.2.2 Energy finite element analysisĮFEA is a finite element-based computational method for high frequency vibration and acoustic analysis.

Finite element analysis