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Overview

For over 30 years, Altair SeamTM software has provided a method of analysis that is particularly well-suited for studying the dynamic response of complex structures at mid and high frequencies.

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Seam Showcase Video Brief introduction to the NVH software, Seam.





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Success Story: Seam for BMW Publication highlighting BMW's success using SEAM View BMW Success Story
Altair Seam is used to predict interior noise and vibration in automobiles, aircraft, and construction equipment cabs as well as the radiated noise from ships and the vibroacoustic environments for spacecraft. Other applications include machinery noise, industrial noise, and building acoustics.

Seam includes a complete implementation of statistical energy analysis (SEA). The complex dynamic system being analyzed is divided into a set of substructures and acoustic elements. The modes of each substructure and acoustic element are grouped into SEA subsystems. The flow of energy between the different subsystems is proportional to the modal energies of the subsystems and the coupling factors. The Seam program calculates all required coupling factors and performs a power balance for each subsystem. The resulting equations are solved for the modal energy and response of each subsystem.

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"[Project] costs were justified by utilizing Seam software as analytical tool. Seam supported our testing and re- engineering parameters while reducing test hours and keeping overall expenses down."
–Lee Schroeder, Senior Engineering Analyst
International Trucks

Benefits

Key Features & Benefits

  • Industry-leading SEA solver speed

  • Ability to incorporate predicted or measured stiffening or pressurization effects into hybrid SEA models

  • Transient analysis for time-varying input loads

  • Automatic or specified calculation of coupling loss factors and modal densities

  • Transverse shear deformation corrections for bending of all structural elements

  • All damping and material properties may be specified as frequency-dependent

  • Design sensitivity analysis

  • Interface to structural optimization programs

  • Automatic generation of SEA subsystems from structural and acoustic elements

  • Automatic generation of SEA junctions for each degree of freedom from structural and acoustic point, line and area connections

  • Acoustic damping using loss factors, absorption coefficients, or reverberation times

  • Porous fiber or foam material types based on easily-measured properties from flow resistivity or impedance tube testing

  • Transmission line formulation to predict the transmission loss or absorption through multiple layers of acoustic treatments including fibers, foams, mass barriers, air gaps, panels, etc.,

  • Ability to calculate the damping, stiffness, and mass effects of free- and constrained-layer structural damping treatments

  • Special materials models for honeycomb, fiber, and viscoelastic materials

  • Options for modal density formulations

  • Options for junction compliance, vibration isolation mounts, and mass

  • Options for fluid loading, component loading, and defined conductance

  • Selection of run-time parameters including frequency range and transients

Industry Applications

Seam has led the way in statistical energy analysis software. Developed in 1980 for structure-borne noise studies in submarines, Seam quickly branched out to all industries. They were the first commercial SEA software to be used in the marine, aerospace and automotive industries.

Product Interfaces

SEAM interfaces with Altair HyperStudy.

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Seam is used to predict interior noise and vibration in a variety of vehicles. Seam is an accepted analysis procedure for many industries, including major shipyards. Seam allows frequency dependent properties to be defined and develop symbolic models.
Seam is used to predict interior noise and vibration in a variety of vehicles. Seam is an accepted analysis procedure for many industries, including major shipyards. Seam allows frequency dependent properties to be defined and develop symbolic models.
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