TY - JOUR
T1 - Active control of environmental noise, IV
T2 - Practical extensions to ecas theory
AU - Wright, S. E.
AU - Vuksanovic, B.
PY - 1999/5/13
Y1 - 1999/5/13
N2 - The basic Electronically Controlled Acoustic Shadow (ECAS) model in Paper I [1] (Wright and Vuksanovic 1996 Journal of Sound and Vibration 190, 565-585), considered the sound cancellation from a flat (2D), in-phase primary source, radiating in free field (no reflecting surfaces) and in a stationary propagating fluid (no wind), using monopole (omnidirection) cancellers. In Paper II [2] (Wright and Vuksanovic 1997 Journal of Sound and Vibration 202, 313-359), the theory was extended to high frequency non-compact acoustic sources, where the acoustic wavelength is small compared to the source size. Paper III [3] (Wright and Vuksanovic 1999 Journal of Sound and Vibration, 220, 469-496) considered the implementation of ECAS theory into practice. This paper considers the following practical extensions to the basic ECAS model: (a) out-of-phase primary sources; (b) three-dimensional primary sources; (c) ground reflection; (d) directional secondary sources and (e) wind effect.
AB - The basic Electronically Controlled Acoustic Shadow (ECAS) model in Paper I [1] (Wright and Vuksanovic 1996 Journal of Sound and Vibration 190, 565-585), considered the sound cancellation from a flat (2D), in-phase primary source, radiating in free field (no reflecting surfaces) and in a stationary propagating fluid (no wind), using monopole (omnidirection) cancellers. In Paper II [2] (Wright and Vuksanovic 1997 Journal of Sound and Vibration 202, 313-359), the theory was extended to high frequency non-compact acoustic sources, where the acoustic wavelength is small compared to the source size. Paper III [3] (Wright and Vuksanovic 1999 Journal of Sound and Vibration, 220, 469-496) considered the implementation of ECAS theory into practice. This paper considers the following practical extensions to the basic ECAS model: (a) out-of-phase primary sources; (b) three-dimensional primary sources; (c) ground reflection; (d) directional secondary sources and (e) wind effect.
UR - http://www.scopus.com/inward/record.url?scp=0003357974&partnerID=8YFLogxK
U2 - 10.1006/jsvi.1998.2094
DO - 10.1006/jsvi.1998.2094
M3 - Article
AN - SCOPUS:0003357974
SN - 0022-460X
VL - 222
SP - 635
EP - 668
JO - Journal of Sound and Vibration
JF - Journal of Sound and Vibration
IS - 4
ER -