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Ground-Plane Microphone Configuration for Propeller-Driven Light-Aircraft Noise Measurement
- Aerospace Standard
- ARP4055A
- Stabilized
Sector:
Issuing Committee:
Language:
English
Scope
The scope of this ARP embraces the description of a configuration for a ground-plane microphone installation that may be used to determine sound pressure levels equivalent to those which would have been measured in an acoustic freefield at the microphone location. The one-third - octave-band center-frequency range over which equivalent freefield sound pressure levels may be obtained is from as low as 50 Hz to at least as high as 10,000 Hz.
The specific application of the measurement technique described in this ARP is the determination of the equivalent freefield sound pressure levels of the noise produced by propeller-driven light aircraft, in flight, for sound incidence angles within 30 degrees of the normal to the ground. For larger angles to the normal, additional adjustments may be necessary which are outside the scope of this ARP. Caution needs to be exercised, therefore, if the recommended configuration is used to measure the noise from aircraft other than those driven by propeller powerplants, in particular, when full spectral information is required (especially outside the range of 30 degrees to the normal to the ground surface), or when measurements of time-integrated noise descriptors are required.
Rationale
This document is not used for certification. However, the technique used may be useful reference for researchers, and therefore it should be stabilized.
Recommended Content
| Aerospace Standard | Acoustic Effects Produced by a Reflecting Plane |
| Aerospace Standard | Practical Methods to Obtain Free-Field Sound Pressure Levels from Acoustical Measurements Over Ground Surfaces |
| Aerospace Standard | MEASUREMENTS OF AIRCRAFT EXTERIOR NOISE IN THE FIELD |
Topic
Data Sets - Support Documents
No Datasets Available
Issuing Committee
A-21 Aircraft Noise Measurement Aviation Emission Modeling
To develop and maintain relevancy of recommended practices for aircraft noise measurement and guidance for modeling of both aircraft noise and aviation emissions and to promote a unified technical approach to support the practical assessment of their impact.
Reference
| Number | Title |
|---|---|
| AIAA77-1371 | This document is not part of the subscrption. |
| AIAA84-2353 | This document is not part of the subscrption. |
| AIAA86 | This document is not part of the subscrption. |
| AIR1327 | ACOUSTIC EFFECTS PRODUCED BY A REFLECTING PLANE |
| AIR1672 | PRACTICAL METHODS TO OBTAIN FREE-FIELD SOUND PRESSURE LEVELS FROM ACOUSTICAL MEASUREMENTS OVER GROUND SURFACES |
| DFVLR IB-128-82-9 | This document is not part of the subscrption. |
| DFVLRFB-81-28 | This document is not part of the subscrption. |
| DFVLRIB-128-82- | This document is not part of the subscrption. |
| ICAO97 | This document is not part of the subscrption. |
| NASATP-2004 | This document is not part of the subscrption. |
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