Results 21 to 30 of about 128,951 (314)

Measuring acoustic habitats [PDF]

, 2015
NDM was part-funded by an EPSRC Doctoral Training Award (No. EP/P505399/1). MPJ and PLT were supported by Marine Alliance for Science and Technology Scotland (MASTS) and MPJ by a Marie Curie CIG Award.Many organisms depend on sound for communication ...
Nathan D. Merchant, Matthew J. Witt, Tyack, P.L., Blondel, Philippe, Philippe Blondel, Witt, Matthew J., Johnson, Mark P., Merchant, Nathan D., Merchant, N.D., Parks, S.E., Kurt M. Fristrup, Susan E. Parks, Fristrup, K.M., Witt, M.J., Tyack, Peter L., Parks, Susan E., Mark P. Johnson, Blondel, P., Fristrup, Kurt M., Johnson, M.P., Peter L. Tyack   +20 more
core   +1 more source

A novel noise reduction technique for underwater acoustic signals based on complete ensemble empirical mode decomposition with adaptive noise, minimum mean square variance criterion and least mean square adaptive filter

Defence Technology, 2020
Underwater acoustic signal processing is one of the research hotspots in underwater acoustics. Noise reduction of underwater acoustic signals is the key to underwater acoustic signal processing.
Yu-xing Li, Long Wang
doaj   +1 more source

Research of multiplicative noise reduction method for acoustic emission signal

Gong-kuang zidonghua, 2014
Based on the features of acoustic emission signal, the paper researched noise reduction methods of adaptive filters and wavelet decomposition fit acoustic emission signal with multiplicative noise. It compared simulation results of noise reduction of the
MA Xiaoli, LIU Yancong, LI Chengkai, WANG Wenchao   +3 more
doaj   +1 more source

Acoustic scattering effect prediction of helicopter fuselage based on BEM and convective FW–H equation

Acta Acustica, 2022
The main acoustic noise source of helicopters is supposed to be the rotor blades, but the scattering effect of the helicopter fuselage sometimes cannot be ignored.
Wang Zeyang, Huang Jun, Yi Mingxu
doaj   +1 more source

Vibration modes and acoustic noise in a four-phase switched reluctance motor [PDF]

, 1996
Acoustic noise in the switched reluctance motor (SRM) is caused primarily by the deformation of the stator lamination stack. Acoustic noise is most severe when the periodic excitation of the SRM phases excites a natural vibration mode of the stack.
Miller, T.J.E., Colby, R.S., Mottier, F.M.   +2 more
core   +1 more source

Panel of resonators with variable resonance frequency for noise control [PDF]

, 2012
The article focuses on acoustic resonators made of perforated sheets bonded onto honeycomb cavities. This kind of resonators can be used in adverse conditions such as high temperature, dirt and mechanical constraints. For all these reasons, they are, for
Pommier-Budinger, V., Pommier-Budinger, Valérie, Valerie Pommier-Budinger, Olivier Cherrier, Cherrier, Olivier, Simon, Frank, Simon, F., Frank Simon   +7 more
core   +1 more source

Diesel engine fuel injection monitoring using acoustic measurements and independent component analysis [PDF]

, 2010
Air-borne acoustic based condition monitoring is a promising technique because of its intrusive nature and the rich information contained within the acoustic signals including all sources.
Gu, Fengshou, Ball, Andrew, Ball, A. D., Albarbar, A., A.D. Ball, Gu, F., A. Albarbar, F. Gu   +7 more
core   +1 more source

Semi-Automated Classification of Side-Scan Sonar Data for Mapping Sabellaria spinulosa Reefs in the Brown Bank, Dutch Continental Shelf

Journal of Marine Science and Engineering
Biogenic reefs support marine biodiversity and play a key role in a healthy marine environment. Protecting and enhancing reef-building species, such as Sabellaria spinulosa, require mapping and monitoring strategies.
Timo Constantin Gaida, Bas Binnerts, Oscar Bos   +2 more
doaj   +1 more source

A frequency-dependent acoustic diversity index: A revision to a classic acoustic index for soundscape ecological research

Ecological Indicators, 2023
In recent years, passive acoustic monitoring (PAM) has been widely applied in the field of soundscape ecology. Meanwhile, acoustic indices, as an important tool for rapid biodiversity assessment (RBA), have also attracted increasing attention.
Zhi-yong Xu, Lei Chen, Bryan C. Pijanowski, Zhao Zhao   +3 more
doaj   +1 more source

Research on Thermal Dissipation Characteristics Based on the Physical Laws of Forced Vibration in Granular Assemblies

Applied Sciences
Particle damping technology is applied in vibration and noise reduction because of its good broadband vibration reduction effect. The energy transfer and loss between particles are keys to the role of damping.
Shengwu Zhang, Wei Xu, Chiming Wang, Yuanchao Zhang, Yanan Li, Jianwei Cheng   +5 more
doaj   +1 more source