Noise suppression of a dipole source by tensioned membrane with side-branch cavities.

Title Noise Suppression of a Dipole Source by Tensioned Membrane with Side-branch Cavities Rights This Work Is Licensed under a Creative Commons Attribution- Noncommercial-noderivatives 4.0 International License. Noise Suppression of a Dipole Source by Tensioned Membrane with Side-branch Cavities

Reducing the ducted-fan noise at the low frequency range remains a big technical challenge. This study presents a passive approach to directly suppress the dipole sound radiation from an axial-flow fan housed by a tensioned membrane with cavity backing. The method aims at achieving control of low frequency noise with an appreciable bandwidth. The use of the membrane not only eliminates the aero...

Title Noise suppression of a dipole source by tensioned membranewith side - branch cavities

Reducing the ducted-fan noise at the low frequency range remains a big technical challenge. This study presents a passive approach to directly suppress the dipole sound radiation from an axial-flow fan housed by a tensioned membrane with cavity backing. The method aims at achieving control of low frequency noise with an appreciable bandwidth. The use of the membrane not only eliminates the aero...

Noise suppression of a dipole source by tensioned membranewith side

Evaluating suppression of PGE2, PAF, and histamine synthesis and histopathological changes of bones in the membrane surrounding particulate polymethylmethacrylate in the rat tibia

  Abstract   Introduction: Inflammation and wear debris may be responsible for bone lysis   and subsequent lost in aseptic arthroplasty. Prostaglandin E2, platelet activating factor,   and histamine are important mediators of inflammatory cells. We studied   histopathological changes of cement-bone interface after using specific antagonists   of these mediators.   Methods: Left and right tibiae...

Damage Detection in Post-tensioned Slab Using 2D Wavelet Transforms

Earthquake force, loading more than structural capacity, cracking, material fatigue and the other unpredicted events were undeniable in the structure life cycle in order that environmental conditions of the structure would be changed and treats health. Damage of structures such as crack, corrosion of the post tension cables from inappropriate grouting of the post tension structures and etc. can...