EFEA and Hybrid FEA by Michigan Engineering Services (MES)

Analysis for Middle to High-frequency Vibro-acoustic Simulations

Energy Finite Element Analysis (EFEA) can perform middle to high-frequency vibration and acoustic simulations for complex structural-acoustic systems. The EFEA code is computationally efficient and easy to use. It is compatible with CAD databases used during product development and it can be easily integrated within a multi-disciplinary design environment. This unique technology offers a competitive advantage to MES’ customers and streamlines the structural–acoustic simulations with other analyses during the design process.


Finite Element Model

A finite element model is used for mid to high frequency analysis. It complements conventional finite element solvers and is a common model development process.

Computational Efficiency

Alternative designs can be evaluated rapidly. Fast turn around times allow simulations to influence the design.


EFEA is applicable to noise and vibration simulations in different engineering disciplines with a wide knowledge base.

Key Features


Many validation studies are available in the literature to provide reliable results.

Data Export

The data file for the EFEA solver uses the NASTRAN format. The model can be generated in Altair® HyperMesh® and exported in NASTRAN format.

Post-Processed Visualization

The results from the EFEA solver are reported in NASTRAN format. The results can be post-processed and visualized in HyperMesh.

Libraries of Elements and Joints

Since energy variables are used in the EFEA, specialized formulations are necessary for all elements. Unlike conventional finite element codes, a library of joints must also be available in order to capture the power transfer characteristics at discontinuities and at interfacing domains.

Automated Generation of Joint Elements

An automated "pre-EFEA" processor uses the topology of the finite element model, the properties, and the interfacing domains for automatically identifying all locations where joints are needed.


Mechanical excitation can be applied on structural members and acoustic sources can prescribe the excitation in acoustic spaces.