A High Intensity Infrasonic Acoustic Test System

Features

• Cover Type: Spiral Bound
• Published by: Storming Media 2001
• Written in: English
• ISBN 10 Number: 142355017X
• ISBN 13 Number: 978-1423550174

Product Description
This is a ARMY RESEARCH LAB ADELPHI MD report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A142993. The abstract provided by the Pentagon follows: We describe the design, mathematical modeling, construction, and test of an acoustic test system intended to support the performance of high-intensity acoustic effects experiments on large targets at low-sonic to infrasonic frequencies. An early experimental version of the system, HILF1, used a compressed-air source and airflow modulator from the ARL Mobile Acoustic Source (MOAS) and a single-volume Helmholtz resonator test chamber to achieve sound pressure levels (SPL) above 140 dB in a 5-cu m volume. Based on results from this system, a more advanced system, HILF2, was designed and built. HILF2 uses a compressed-air source based on automotive superchargers, a low-impedance airflow modulator, and a two-volume Helmholtz resonator test chamber to achieve sustained high-purity sinusoidal sound pressure levels in excess of 155 dB in a 2.5-cu m test volume at frequencies from 2 to twenty Hz.