Results 91 to 100 of about 299,182 (254)
Journal of Marine Science and EngineeringWhen an airborne sound source is in rapid motion, the acoustic signal detected by the underwater sensor experiences a substantial Doppler shift. This shift is intricately linked to the motion parameters of the sound source.
Junjie Mao +6 more
doaj +1 more source
Recent Langley helicopter acoustics contributions [PDF]
The helicopter acoustics program at NASA Langley has included technology for elements of noise control ranging from sources of noise to receivers of noise. The scope of Langley contributions for about the last decade is discussed.
Morgan, Homer G. +2 more
core +1 more source
Antarctic marine mammals and ocean acoustics [PDF]
, 2006 Marine mammals rely on sound and hearing as their primary means of communication and sensing their world. Concerns that anthropogenic sound in the ocean could infer their sensing, cause stress or even damage their hearing physically rose a controversial ...
Boebel, Olaf +5 more
core
Joint Analysis of Acoustic Events and Scenes Based on Multitask Learning [PDF]
arXiv, 2019 Acoustic event detection and scene classification are major research tasks in environmental sound analysis, and many methods based on neural networks have been proposed. Conventional methods have addressed these tasks separately; however, acoustic events and scenes are closely related to each other.
arxiv
Available information on the physical characteristics of the noise generated by wind turbines is summarized, with example sound pressure time histories, narrow- and broadband frequency spectra, and noise radiation patterns. Reviewed are noise measurement
Hubbard, Harvey H., Shepherd, Kevin P.
core +1 more source
A Hydrodynamic Model for Measuring Fluid Density and Viscosity by Using Quartz Tuning Forks
Sensors, 2019 A hydrodynamic model of using quartz tuning forks (QTFs) for density and viscosity sensing, by measuring the resonance frequency and quality factor, has been established based on the cantilever beam theory applied to the atomic force microscope (AFM ...
Mi Zhang +3 more
doaj +1 more source
Acoustics-turbulence interaction [PDF]
An investigation of the instability frequency was undertaken. Measurements revealed that the hot wire probe induces and sustains stable upstream oscillation of the free shear layer.
Hussain, A. K. M. F., Zaman, K. B. M. O.
core +1 more source
The Journal of the Acoustical Society of America, 2011 An investigation has been undertaken into acoustic iridescence, exploring how a device can be constructed which alter sound waves, in a similar way to structures in nature that act on light to produce optical iridescence. The main construction had many thin perforated sheets spaced half a wavelength apart for a specified design frequency.
openaire +2 more sources