Active noise control of an exhaust-mounted, two-fan array

作者：Rust Ryan L^*; Gee Kent L; Sommerfeldt Scott D; Blotter Jonathan D

来源：Noise Control Engineering Journal, 2012, 60(4): 481-489.

DOI：10.3397/1.3701026

Fan arrays are used to cool various types of electronic equipment. In addition to adding multiple noise sources, using two nominally identical fans with closely spaced blade passage frequencies (BPF) can create an annoying beating effect. In this work, a two-fan, exhaust-mounted array has been considered for active control of the radiation at the BPF and second harmonic of each fan. Two control configurations were theoretically and experimentally compared. The first control configuration consisted of one controller using six control sources and six error sensors in a fully coupled control system designed to control the noise from both fans simultaneously. The second configuration used two independent controllers with three control sources and three error sensors, i.e., one noise controller per fan. Each noise control configuration was theoretically modeled to examine minimum radiated power and appropriate near-field error sensor locations. Experimental results suggest that independent controllers perform better than a single controller at lower computational cost. It is also demonstrated that active reduction of radiation at both BPFs is sufficient to significantly reduce the audible acoustic beating between the two fans.

• 出版日期2012-7