Results 11 to 20 of about 404,526 (210)
Effect of Distortion on Turbofan Tonal Noise at Cutback with Hybrid Methods
International Journal of Turbomachinery, Propulsion and Power, 2017 New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines. Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes.
Majd Daroukh +4 more
doaj +1 more source
Noise from Centrifugal Fans [PDF]
The Journal of the Acoustical Society of America, 1955 The sound power radiated from the discharge of centrifugal fans of diameters between 3 and 612 inches has been measured as a function of fan dimensions and operating conditions. The measurements were made by arranging the fan under test to discharge into an 11 foot nonreflecting tube in which the static pressure could be controlled.
R. B. Goldman, G. C. Maling
openaire +1 more source
A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans
Energies, 2023 Due to the complexity of the working conditions and the diversity of application scenarios, the normal operation of a fan, whether volute tongue, volute shell surface, or blade, often encounters some unavoidable problems, such as flow separation, wear ...
Wenqiang Zhou +5 more
doaj +1 more source
Lifting Fan Noise Studies [PDF]
ASME 1969 Winter Annual Meeting: GT Papers, 1969 The paper reviews the results of an experimental investigation of noise radiated from a VTOL lifting fan inlet under static inflow conditions. The results are discussed in the light of recent theoretical and experimental conclusions on compressor noise radiation, combined with relevant data on the aerodynamic characteristics of the fan. The presence of
G. Krishnappa, G. G. Levy
openaire +1 more source
Experimental study on vibration and noise characteristics of small fan motors
Nihon Kikai Gakkai ronbunshu, 2014 In this paper, the phenomenon of vibration and noise in a small fan motor caused by electromagnetic forces were experimentally investigated. First, vibration characteristics of the fan motor in a non-operating state were determined by experimental modal ...
Masaki OGUSHI +6 more
doaj +1 more source
Energies, 2022 To improve the aerodynamic performance and reduce the noise of multi-blade centrifugal fans used in air conditioners, a bionic groove structure was introduced into the blade tip design, inspired by the drag reduction characteristics of mantis shrimp.
Ziqian Xu +4 more
doaj +1 more source
Noise Prediction of Centrifugal Fan Based on Improved Nenral Network [PDF]
E3S Web of Conferences, 2021 In order to solve the problems that the prediction accuracy of the traditional centrifugal fan is low and the cost is high, a noise prediction model for centrifugal fan based on improved particle swarm optimization (IPSO) optimized BP neural network was ...
Long Bo +3 more
doaj +1 more source
Energy Science & Engineering, 2023 Indoor air conditioning systems play a crucial role in regulating the environmental conditions of enclosed spaces. The noise generated by such systems can significantly impact human comfort.
Jian Lei +4 more
doaj +1 more source
Main fan noise mitigation technologies in turbofan engines
Aviation, 2014 Aircraft noise and emissions have been of concern since the beginning of commercial aviation. The continuing growth in air traffic and increasing public awareness have made environmental considerations one of the most critical aspects of commercial ...
Fathollah Ommi, Mohammadreza Azimi
doaj +1 more source
Aerodynamic and aeroacoustic properties of axial fan blades with slitted leading edges
Acta Acustica, 2022 A detailed experimental analysis of the aerodynamic and aeroacoustic properties of flat-plate axial fans with slitted leading edges is performed. The sound emissions of five slitted leading edge designs are measured at a constant rotational speed and at ...
Ocker Christof +4 more
doaj +1 more source