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Trailing edge noise reduction of wind turbine blades by active flow control
, 2015In the current study, we investigate a route to reduction of the turbulent boundary layer–trailing edge interaction noise. The trailing edge noise is generated by surface pressure fluctuations beneath a turbulent boundary and scattered at the trailing ...
Alexander Wolf +5 more
semanticscholar +1 more source
The Journal of the Acoustical Society of America, 2006
A noise reduction apparatus that reduces noise of intermediate to high range in a compartment of a vehicle. The apparatus comprises a source unit (1) that generates a reproduction signal, an ANC unit (2) that performs a signal processing to actively cancel the noise, a sensor (6) that detects information inside and outside the vehicle, an inside voice ...
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A noise reduction apparatus that reduces noise of intermediate to high range in a compartment of a vehicle. The apparatus comprises a source unit (1) that generates a reproduction signal, an ANC unit (2) that performs a signal processing to actively cancel the noise, a sensor (6) that detects information inside and outside the vehicle, an inside voice ...
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Applied Acoustics, 1968
Abstract This paper presents experimental data on the diffraction of sound round a semi-infinite plane screen in a free field and describes a method for calculating the shielding effect of a real screen employed for the purpose of noise reduction, with the assistance of a single graph and without the aid of a computer.
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Abstract This paper presents experimental data on the diffraction of sound round a semi-infinite plane screen in a free field and describes a method for calculating the shielding effect of a real screen employed for the purpose of noise reduction, with the assistance of a single graph and without the aid of a computer.
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Fundamentals of Noise Reduction
2008The existence of noise is inevitable. In all applications that are related to voice and speech, from sound recording, telecommunications, and telecollaborations, to human-machine interfaces, the signal of interest that is picked up by a microphone is generally contaminated by noise.
Jacob Benesty +3 more
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2000
In this chapter we will cover the area of theory and relevant experiments in the generation of squeezed states. Prior to discussing the parametric oscillator, we offer a brief introduction to non-linear optics and input-output theory. Finally, we will discuss other important experiments that generate squeezed states.
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In this chapter we will cover the area of theory and relevant experiments in the generation of squeezed states. Prior to discussing the parametric oscillator, we offer a brief introduction to non-linear optics and input-output theory. Finally, we will discuss other important experiments that generate squeezed states.
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The Journal of the Acoustical Society of America, 1992
When there is relative movement, at a speed above a critical value, between the trailing edge of a body, such as a hydrofoil or aerofoil section, and a fluid, the fluid flow tends to form a pattern of discrete swirling vortices. Vortex shedding at each side of the trailing edge alternately can cause resonance or "singing" of the section.
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When there is relative movement, at a speed above a critical value, between the trailing edge of a body, such as a hydrofoil or aerofoil section, and a fluid, the fluid flow tends to form a pattern of discrete swirling vortices. Vortex shedding at each side of the trailing edge alternately can cause resonance or "singing" of the section.
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The Journal of the Acoustical Society of America, 1989
Electronic circuitry as described which enhances the intelligibility of a speech signal corrupted by low-frequency noise while tending to retain frequency components of the signal characteristic of natural-sounding speech. The circuitry includes a broad band channel which passes the speech signal with little spectral distortion.
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Electronic circuitry as described which enhances the intelligibility of a speech signal corrupted by low-frequency noise while tending to retain frequency components of the signal characteristic of natural-sounding speech. The circuitry includes a broad band channel which passes the speech signal with little spectral distortion.
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2020
The vibration noise influences the ships mainly in two ways: ① worsening the working and living environments, and even the health of sailors; ② affecting the normal and high-precision performance of relevant instruments and equipment. Therefore, vibration and noise reduction has drawn more and more attentions in the ship design.
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The vibration noise influences the ships mainly in two ways: ① worsening the working and living environments, and even the health of sailors; ② affecting the normal and high-precision performance of relevant instruments and equipment. Therefore, vibration and noise reduction has drawn more and more attentions in the ship design.
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AIP Conference Proceedings, 1996
Noise reduction is a problem being encountered in a variety of applications, such as environmental noise cancellation, signal recovery and separation. Passive noise reduction is done with the help of absorbers. Active noise reduction includes the transmission of phase inverted signals for the cancellation.
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Noise reduction is a problem being encountered in a variety of applications, such as environmental noise cancellation, signal recovery and separation. Passive noise reduction is done with the help of absorbers. Active noise reduction includes the transmission of phase inverted signals for the cancellation.
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The Journal of the Acoustical Society of America, 1981
A fan for moving a gaseous fluid, e.g., air, is described in which the high audible frequency noise resulting from the phenomenon occurring at the trailing edges of the blades, known as vortex shedding, is reduced. This is accomplished by notching an edge of each of the blades so that the pattern of vortices leaving the blade, which causes the noise ...
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A fan for moving a gaseous fluid, e.g., air, is described in which the high audible frequency noise resulting from the phenomenon occurring at the trailing edges of the blades, known as vortex shedding, is reduced. This is accomplished by notching an edge of each of the blades so that the pattern of vortices leaving the blade, which causes the noise ...
openaire +2 more sources