Acoustic Facility Operating Manual.pdf

This document is a NASA Code 549 Operating Manual for an Acoustic Facility, effective 10/5/2016. The manual provides detailed operating procedures for a large reverberant acoustic test chamber used to simulate high level, low frequency noise environments for aerospace applications.

The facility contains two horns (25 Hz and 50 Hz), has physical dimensions of 10.3m x 8.2m x 13m, and features 15" thick reinforced concrete walls providing >30 dB noise attenuation. Key systems include a Digital Acoustic Control System (DACS) from M+P International, GN2 storage and supply system, ventilation system with three blowers, and a 7-1/2 ton overhead crane. The manual includes comprehensive checklists for console operators and test engineers covering system verification, chamber preparation, test operations, and safety procedures. Specific operational protocols are provided for 25 Hz horn operation, 50 Hz horn operation, and dual horn operation, with detailed steps for controlling pressures, valves, and power settings. Safety features include an O2 sensor with audible alarm and emergency shutdown capabilities.