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	SwRI engineers use sound intensity measurements for sound source ranking and noise reduction of office equipment.

Southwest Research Institute (SwRI) provides acoustic evaluations and analyses for a broad range of commercial and government clients. Acoustic evaluation facilities include a large, hemi-anechoic chamber that can accommodate equipment ranging from small electronic components to vehicles. Portable data acquisition equipment and transducers are also available to acquire in-situ noise and vibration measurements at client locations as well as pass-by noise testing.

SwRI engineers have expertise in both analytical and experimental techniques, and can effectively incorporate the two to solve a broad range of acoustic problems. Specific capabilities include:

Acoustic Analytical Modeling

• Structural dynamic finite element modeling

• Boundary element acoustic radiation prediction

• Sound propagation prediction

  	SwRI uses empirical noise source ranking, transmission path identification, vibroacoustic analyses, and sound quality evaluations to develop cost-efficient noise control measures for vehicle systems.

Experimental Methods

• In-service noise ranking and path identification

• Sound pressure and power evaluations

• Sound intensity measurements

• Sound quality analysis

• Acoustic imaging

• Structural impedance measurements

• Component coupling predictions

• Pass-by and interior noise

• In-ear noise measurements

Standardized Evaluations

SwRI has performed noise evaluations to the following standards for a broad range of clients:

• Telecommunication (Telcordia GR-63-CORE, ETSI 300 753, ISO7779, ATIS-0600005.2006, ANSI 51.10, etc.)

• Sound power (ISO 3744, ANSI 512.54, etc.)

• Vehicle/machinery (ISO 11201, 6395, 6396; EN 12053; SAE J366; ASME B56.11.5)

• Military (MIL-STD-1474)

  	A tractor undergoes noise testing in an SwRI chamber to identify major noise sources and paths of propagation.

Noise Control

• Noise barriers and absorbing materials

• Vibration isolation and panel-damping treatments

• Absorptive materials

• Active noise and vibration control

• Noise source identification and ranking

For more information about acoustic evaluation and analysis capabilities at SwRI or how you can contract with SwRI, please contact Paul Till at ptill@swri.org or (210) 522-3554.
 

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

October 03, 2008