Design and acoustic characteristics of an anechoic chamber with high-power heating or cooling and sound field free transform system

In this paper, the design and the acoustic characteristics of an anechoic chamber with high-power heating or cooling condition and sound field free transform system are summarized. Moreover, during the construction of the anechoic chamber, the following technical problems have been solved successfully. (1) Under 15 kW heating or cooling energy load being released by the sound source in the anechoic chamber, the adjusting to the temperature and the humidity can be completed. (2) Through the moving of the mobile sound absorption plane, two anechoic chambers can be combined into one anechoic chamber, one semi-anechoic chamber, or one octant semi-anechoic chamber. Its sound field characteristics conform to the standard ISO 3745. (3) During the normal state, the background noise in the anechoic chamber is less than 23 dBA.