Aero-Acoustic Laboratory Testing & Evaluation Services

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The IAC Aero-Acoustic Laboratory is on call to demonstrate specification compliance and acoustic component performance for ASTM, ANSI, ISO, EU and other Standards.

For more than 50 years, the Industrial Acoustics Company has been designing, developing and testing leading edge sound control products. Research and Development has enabled IAC to maintain its position as a leader in the Noise Control Industry for almost a half century. Our wide range of products and a strong tradition of custom engineering have demanded a high level of scientific and technological expertise in acoustics, aerodynamics, materials and manufacturing processes. Innovative thinking, backed by rigorous testing and experimentation has enabled IAC to be first in the field with many products and materials for sound control ranging from duct silencers to sound proof doors, recording studios, anechoic test chambers and aircraft run-up pens. Now you can take advantage of the expertise and experience of the R&D team at IAC. From absorption coefficients to transmission loss, IAC’s aero-acoustics laboratory can test and evaluate the acoustical performance of your product.

The Aero-Acoustics Laboratory maintains a rigorous standard of quality in performing independent tests. Our facility has been recognized by the National Institute of Standards and Technology under the National Voluntary Laboratory Accreditation Program (NVLAP) for acoustical testing services. The acoustic test facilities include a 10,000 cubic foot reverberation room, an acoustic wind tunnel and two impedance tubes. A high-pressure blow-down rig provides for aerodynamic modeling of heavy-duty silencers and jet engine test cells.

Customers, specifying engineers, and acoustical consultants are always welcome in the IAC laboratory. Contact us to arrange inspection and witnessed testing programs.

ASTM E477: Standard Test Method for Measuring Acoustical and Airflow Performance of Duct Liner Materials and Prefabricated Silencers
This laboratory test represents a typical installation of an air conditioning duct silencer. The test measures the reduction of sound pressure levels due to the presence of the silencer at various airflow rates. Airflow generated noise and pressure losses are also measured.

ASTM E90 and ISO 140 (part 3): Airborne Sound Transmission Loss of Building Partitions
This test measures the sound isolating properties of a partition by comparing the sound energy in two adjacent chambers separated by the test specimen. Broadband noise is generated in one chamber and sound pressure levels are measured simultaneously in both. After correcting for room losses and the area of the sample, the difference between the two sets of data is the Transmission Loss in decibels for each test frequency. A single number rating called Sound Transmission Class or STC (described in ASTM E413) is also calculated. The rating is derived by fitting the transmission loss data to a set of standard performance curves.

ASTM C423 and ISO 354: Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
Sound absorption in a random incidence sound field requires the testing of large samples in a 10,000 cubic foot reverberant chamber. Reverberation times for both the empty room and the room with the test sample in place are measured over a range of frequencies. The Sabins of absorption attributed to the sample are divided by the sample's face area to get Sound Absorption Coefficients at each frequency. A separate standard, ASTM E795, covers the mounting of the test samples.

ASTM C384 Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
This procedure measures the sound absorbing properties of small samples of acoustic material placed inside a long rigid tube. Normal incidence Sound-Absorption Coefficients are derived from measurements of the standing waves developed when a “pure tone” signal is generated in the tube. The method is useful in evaluating the sound absorptive properties of different materials. The IAC Laboratory is equipped with two impedance tubes: A 24” x 24” x 288” tube capable of measurements from 40 Hz to 250 Hz and a 3” diameter tube with a 125 Hz to 2000 Hz range.

ASTM C522 Standard Test Method for Airflow Resistance of Acoustical Materials
The properties of porous materials that absorb sound are related to the viscous resistance offered to small vibratory movements of air. This property can be assessed by passing a controlled airflow through a sample and measuring the flow resistivity to airflow in mks rayls/m

ASTM E1408 Laboratory Measurement of the Sound Transmission Loss of Door Panels and Door Systems
The standard adapts the procedure of ASTM E90 specifically to the testing of doors. Requirements are included for operating the door sample and reporting the forces required to open and close the door.

ASTM E596 Noise Reduction of Sound Isolating Enclosures
This standard method is used to rate the performance of sound isolation enclosures used in audiometry, recording, music practice etc. The test compares the inside and outside sound levels when the enclosure is exposed to random incidence sound in a reverberation chamber. Microphone positions are selected to record average levels consistent with the purpose of the enclosure. Noise Reduction is the difference between outside and inside sound levels in each one-third-octave band.

ASTM E336: Standard Test Method for Measurement of Airborne Sound Insulation in Buildings
This standard method is used for the in-situ measurement of sound isolation between spaces. Under the right conditions, this method can also be used for in-situ measurements of the sound transmission loss characteristics of partitions.

IAC’s Product Teams work with the Research and Development division to provide innovative solutions to unusual problems as well as create new or improved noise control and acoustical conditioning products. IAC’s Aero-Acoustics Laboratory provides the quality control testing necessary to insure the accuracy of acoustical, aerodynamic, structural, and mechanical ratings.

R&D, Engineering and Manufacturing capabilities service the Architectural, Air Conditioning (HVAC), Industrial, and Medical/Life Sciences markets. Products include a wide range of Noise-Lock Doors - Acoustic Window Systems - HVAC and Industrial Silencers - Medical Audiometric Testing Rooms - Engine Test Cells - Broadcasting/Recording Studios - Music Practice Rooms - Specialty Large Access Systems - Anechoic, Reverberation, and other Test Facilities - Transportation and Community Noise Control Sound Barriers - Sound Absorption Systems - and Quiet Rooms/Enclosures for Industry.