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The new Acoustic Technology Center (ATC) at E-A-R™ Thermal/Acoustic Systems is a purpose-built facility to serve the commercial vehicle, automotive, aircraft, industrial and electronics markets supplied by this company. The design was driven by test versatility and rigorous facility performance specifications, enabling simultaneous testing of heavy duty vehicles and high performance noise reduction materials and systems in adjacent but uncoupled chambers. The intent of the facility layout is to utilize space efficiently while allowing a wide variety of vehicle, subsystem, component and material tests. Working closely with E-A-R, Acoustical Consulting Services established critical facility parameters to achieve intended functional attributes and Affiliated Construction Services constructed the facility to these specifications.

In-vehicle reverberation time as a function of frequency can be used as one indicator of the quality of a vehicle interior as an acoustic space. Typically, however, reverberation times in passenger vehicles are so short that they can be extremely difficult to measure using interrupted noise or impulse excitations. This paper investigates a steady state method of determining reverberation times by adapting the power injection method, which is typically used to determine composite damping loss factors of panels. The results of using this method will be compared with those of other methods. Theoretical and practical advantages and disadvantages will be discussed. Application of this method to absorption measurement will be discussed as well.

Test standards are essential for evaluating the performance of a product properly and for developing a data base for the product. This paper discusses various standards that are available for determining the acoustical performance of sound package materials. The paper emphasizes various SAE standards that are available in this area, the reasons why these standards are important to the researchers working in the mobility industry, the history behind the development of these standards, and how they are different from standards that are available from other standards organization on similar topics.