Acoustic design of an anechoic chamber

✍ Scribed by Xiang Duanqi; Wang Zheng; Chen Jinjing

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 795 KB
• Volume: 29
• Category: Article
• ISSN: 0003-682X
• DOI: 10.1016/0003-682x(90)90027-r

✦ Synopsis

This paper describes the acoustic design of an anechoic chamber built mainly for the measurement of the acoustic properties of electrical equipment. In order to reduce background noise the anechoic chamber was built on a 'box within a box' principle and mounted on an isolating foundation which consisted of 50 spring vibration isolators. To extend the free field and to obtain the lowest possible low cut-off frequency, absorbing wedges of 1150mm long were used in the chamber, spaced 150ram from the wall. Measurements conducted after the completion of the anechoic chamber indicated that all the original acoustic design criteria had been reached, some even surpassed. The anechoic chamber showed excellent acoustic characteristics during its use after completion in the following year.