Accession Number:

ADA021247

Title:

The ARL/FEU (Fluids Engineering Unit) Semi-Anechoic Chamber.

Descriptive Note:

Technical memo.,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

• Lauchle,G. C.
• Wong,E.

Report Date:

1975-09-29

Pagination or Media Count:

22.0

Abstract:

This memorandum documents the design and acoustic characteristics of the ARLFluids Engineering Unit semi-anechoic chamber. It is located on the first floor of the Garfield Thomas Water Tunnel and has internal dimensions of 11 x 12 x 8 feet. The sound absorbing walls are primarily composed of rock-wool fiberglass insulation, air voids, and wood frame members. Based on measurements of the ambient noise level, reverberation time, transmission loss, and inverse square law, the chamber is considered semi-anechoic for frequencies less than approximately 1kHz and moderately anechoic for greater frequencies.

Descriptors:

• *TEST FACILITIES
• *ANECHOIC CHAMBERS
• FREQUENCY
• TIME
• ACOUSTIC MEASUREMENT
• WALLS
• ABSORPTION
• REVERBERATION
• TRANSMISSION LOSS

Subject Categories:

• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE