منابع مشابه
Near - Field Noise Computation for a Supersonic Circular Jet
A fully expanded, high-Reynolds-number, supersonic circular jet of Mach number 1.4 is simulated, using a 3-D finite-volume NavierStokes solver, with emphasis on the near field noise. The numerical results are generally in good agreement with existing experimental findings.
متن کاملNear-field acoustic streaming jet.
A numerical and experimental investigation of the acoustic streaming flow in the near field of a circular plane ultrasonic transducer in water is performed. The experimental domain is a parallelepipedic cavity delimited by absorbing walls to avoid acoustic reflection, with a top free surface. The flow velocities are measured by particle image velocimetry, leading to well-resolved velocity profi...
متن کاملDevelopment of a near-field acoustical holography system for aircraft jet source noise measurements
Military jet aircraft are exposing both ground maintenance personnel and the community to high levels of noise. The US Department of Defense is funding research to develop advanced modeling tools for noise reduction techniques and community noise exposure. For these tools to achieve their full potential, innovative measurement and analysis methods are necessary to characterize the jet noise sou...
متن کاملCharacterization of rocket and jet noise using near-field acoustic holography methods
As rockets and jets on military aircraft become more powerful, the noise they produce can lead to structural fatigue, hearing damage, and community disturbances. Noise-reduction technologies and sound radiation prediction require accurate characterization of the noise sources within rocket plumes and jets. Near-field acoustical holography techniques were used to visualize the sound field in the...
متن کاملMilitary jet noise source imaging using multisource statistically optimized near-field acoustical holography.
The identification of acoustic sources is critical to targeted noise reduction efforts for jets on high-performance tactical aircraft. This paper describes the imaging of acoustic sources from a tactical jet using near-field acoustical holography techniques. The measurement consists of a series of scans over the hologram with a dense microphone array. Partial field decomposition methods are per...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1957
ISSN: 0001-4966
DOI: 10.1121/1.1919013