Space

Instrumentation

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 20/10/2026, 13:20:27 UTC.

Briefings

NASA Glenn Research Center uses specialized instrumentation including particle image velocimetry, hot wire anemometry, and rotating microphone rakes to measure airflow and sound for aviation noise reduction. The rotating microphone Rake Mode Measurement System (RRMS) pioneered in the 1990s allows engineers to capture detailed velocity data and identify noise sources on rotating blades, which is essential for validating noise prediction software and designing effective active noise control systems.

Key points

• NASA Glenn Research Center employs rotating microphone rakes to capture detailed velocity measurements of air passing through experimental propulsors, enabling identification of noise sources on rotating blades.
• The rotating microphone Rake Mode Measurement System (RRMS) was pioneered in the 1990s and is used to validate noise prediction software and design active noise control systems for turbofan engines.

Context

The global aviation noise reduction community relies on NASA Glenn Research Center experiments to validate theory and noise prediction software. NASA Glenn's Glenn Labs and Test Facilities at Lewis Field and the Neil Armstrong Test Facility in Sandusky, Ohio, house ground-based research for science in the air.

Limitations

Evidence covers only NASA Glenn Research Center instrumentation used for aviation noise reduction. Specific dates for the 1990s implementation are not provided, and the article does not contain data on other research facilities or specific performance metrics.

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