|Document ID (ISN)||61129|
|ISSN - Serial title
||0002-8894 - American Industrial Hygiene Association Journal
|Convention or series no.
||Gordon R.T., Vining W.D.
||Active noise controls - A review of the field
||Nov. 1992. Vol.53, No.11, p.721-725. 31 ref.
||Active noise control (ANC) employs superposition of waves to induce destructive interference to affect noise attenuation. Categories of ANC are one-dimensional field and duct noise; enclosed spaces and interior noise; noise in three-dimensional spaces; and personal hearing protection. Development of ANC stems from potential advantages in cost, size, and effectiveness. ANC of turbulent flow in pipes and ducts is the largest area in the field. Much work into the actual mechanism involved and the causal versus non-causal aspects of system controllers has been done. Fan and propeller noise can be divided into two categories: noise generated directly as the blade passing tones and noise generated as a result of blade tip turbulence inducing vibration in structures. Three-dimensional spaces present a noise environment where physical limitations are magnified. Personal hearing protection has been shown to be best suited to the control of periodic, low-frequency noise.
||noise; antiphase noise; noise control
||literature survey; hearing protection; history; fans; ducts; low-frequency noise
||D - Periodical articles
|Country / State or Province||USA|
||Noise, hearing and vibration
|Broad subject area(s)