Results 251 to 260 of about 1,058,558 (285)
Some of the next articles are maybe not open access.
Effects of Noise and Tonal Stimuli on Hearing in Pinnipeds
2008Abstract : The practical objective for FY08 was to complete behavioral testing with three subjects against an equal energy matrix of tonal noise exposures (with similar characteristics to mid-frequency sonar) based on pre-determined combinations of stimulus duration and received sound pressure level.
openaire +1 more source
The effect of acoustic forcing on an airfoil tonal noise mechanism
The Journal of the Acoustical Society of America, 2014The response of the boundary layer over an airfoil with cavity to external acoustic forcing, across a sweep of frequencies, was measured. The boundary layer downstream of the cavity trailing edge was found to respond strongly and selectively at the natural airfoil tonal frequencies. This is considered to be due to enhanced feedback.
Schumacher, K., Doolan, C., Kelso, R.
openaire +3 more sources
On the influence of trailing-edge serrations on open-rotor tonal noise
18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 2012Tonal noise of contra-rotating open rotors can be divided into self and interaction noise. The latter can be subdivided into potential field interaction noise, noise due to the interaction of the front-rotor wakes with the aft-rotor blades and tip vortex interaction noise.
Weckmüller, Ch., Guerin, S.
openaire +3 more sources
Sweep Effects on Slat Tonal Noise
AIAA JournalWall-resolved large-eddy simulations (WRLES) are performed for the 30P30N high-lift configuration using a novel, self-developed high-order flux reconstruction (FR) solver. This study presents several key innovations, including the implementation of a computationally efficient setup that achieves fourth-order accuracy and successfully demonstrates the ...
Keli Zhang +4 more
openaire +1 more source
Active Control of Tonal and Broadband Noise
2012Active reduction of disturbing noise requires the generation of appropriate control signals in order to drive the canceling sources. For this purpose we have to organize the signal processing of data provided by sensors. These data contain information about the disturbance as well as about the systems state.
openaire +1 more source
Broadband and Tonal Noise of Flow Excited Cavities
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I, 1997Abstract Noise generation by low Mach number flow over a cavity is investigated. Prediction models for broadband noise and for tonal noise are compared with experimental data. The prediction model for broadband noise is based on the wavenumber-frequency spectrum of pressure fluctuations under a turbulent boundary layer. In the prediction
J. C. Bruggeman +2 more
openaire +1 more source
Active noise control of aircraft engine discrete tonal noise
The Journal of the Acoustical Society of America, 1997An active noise control subassembly for an aircraft engine. An aircraft engine noise radiating panel is bendably vibratable to generate a canceling noise generally opposite in phase to at least a portion of the discrete tonal noise produced by the engine. A piezoceramic actuator plate is vibratable by an applied electric AC signal.
openaire +1 more source
Neural fixed-parameter active noise controller for variable frequency tonal noise
Neurocomputing, 2013Sound emitted by audible warning devices for emergency vehicles usually exceeds maximum admissible rates of noise in the aspect of occupational health and safety of the crew inside. Therefore, the idea of active noise control systems for emergency vehicles is an important issue. Most of active noise control systems for emergency vehicles developed till
openaire +2 more sources
ACTIVE TONAL NOISE CANCELLER WITH FREQUENCY TRACKING
NOISE CONTROL - THE NEXT 25 YEARS기계공학전공
h.-s.na, y.park
openaire +1 more source