Results 41 to 50 of about 1,782,949 (343)

Outlet boundary condition and mean temperature gradient effects on the minimum acoustics disturbances energy in triggering nonlinear thermoacoustic instability

The Physics of Fluids
In this study, we theoretically investigate the impact of outlet boundary conditions and mean temperature gradients on the maximum transient growth rate of acoustical energy and the critical energy required for triggering.
Xinyu Zhao, Dan Zhao, Cody M. Shelton, Bing Wang, Xu Dong, Junwei Li, Yue Huang   +6 more
semanticscholar   +1 more source

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

On the evolution of a spherical short pulse in nonlinear acoustics

, 2012
Planar wave propagation in nonlinear acoustics is modeled by the Burgers equation, which is exactly soluble. Spherical wave propagation is modeled by a generalized Burgers equation, in which the dissipative parameter of the plane wave Burgers equation is
Bengt O. Enflo, Claes M. Hedberg, Hedberg, Claes,, Hedberg, Claes M.,, Enflo, Bengt, Enflo, Bengt O.,   +5 more
core   +1 more source

Controllability results for the Moore–Gibson–Thompson equation arising in nonlinear acoustics

Journal of Differential Equations, 2019
We show that the Moore–Gibson–Thomson equation τ ∂ t t t y + α ∂ t t y − c 2 Δ y − b Δ ∂ t y = k ∂ t t ( y 2 ) + χ ω ( t ) u , is controlled by a force that is supported on an moving subset ω ( t ) of the domain, satisfying a geometrical condition. Using
C. Lizama, S. Zamorano
semanticscholar   +1 more source

Well-posedness and numerical treatment of the Blackstock equation in nonlinear acoustics [PDF]

Mathematical Models and Methods in Applied Sciences, 2018
We study the Blackstock equation which models the propagation of nonlinear sound waves through dissipative fluids. Global well-posedness of the model with homogeneous Dirichlet boundary conditions is shown for small initial data. To this end, we employ a
Marvin Fritz, Vanja Nikoli'c, B. Wohlmuth   +2 more
semanticscholar   +1 more source

From Shear to Sound: Mechanics–Acoustics Mapping of TPMS Lattices

Advanced Engineering Materials, EarlyView.
Triply periodic minimal surface (TPMS) lattices are mapped across mechanical and acoustic performance, revealing that descriptors validated in compression fail under shear. First‐time comparison with trusses included. A transition from porous to resonance‐driven absorption emerges at 25% density.
Lucía Doyle, María Ángeles Navacerrada, Johan Christensen, Carlos González   +3 more
wiley   +1 more source

Coupling light and sound: giant nonlinearities from oscillating bubbles and droplets

Nanophotonics, 2019
Nonlinear optical processes are vital for fields including telecommunications, signal processing, data storage, spectroscopy, sensing and imaging. As an independent research area, nonlinear optics began with the invention of the laser, because practical ...
Maksymov Ivan S., Greentree Andrew D.
doaj   +1 more source

Experimental Characterization of Mycelium‐Based Composites Under Multiple Loading Conditions

Advanced Engineering Materials, EarlyView.
This study examines the mechanical response of mycelium‐based composites under compression, shear, and tension using mechanical testing and imaging methods. The comparison between unpressed and hot‐pressed specimens shows that hot pressing is associated with higher compression and shear stiffnesses.
Shaghayegh Elahi, Kimiya Tajik, Harvey Shaw, Matti Isakov, Sami Pajunen, Lauri Rautkari   +5 more
wiley   +1 more source

3D Printing Innovations in Polymeric Porous and Patterned Architecture

Advanced Functional Materials, EarlyView.
Polymeric foams occupy a unique structural space between dense solids and open networks, where engineered void fraction governs mechanical compliance, thermal resistance, and mass transport. Additive manufacturing now enables precise spatial control over cellular architecture, unlocking designer foam structures across applications spanning crash ...
Dhanush Patil, Sri Vaishnavi Thummalapalli, Clarissa Westover, Arunachalam Ramanathan, M. Taylor Sobzcak, Roumika Patil, Qixuan Xiang, Tiantian Li, Sui Yang, Timothy E. Long, Hongyue Sun, Xianqiao Wang, Yang Liu, Kenan Song   +13 more
wiley   +1 more source

Nonlinear acoustic–gravity waves

Journal of Plasma Physics, 2009
AbstractPrevious results on nonlinear acoustic–gravity waves are reconsidered. It turns out that the mathematical techniques used are somewhat similar to those already adopted by the plasma physics community. Consequently, a future interaction between physicists in different fields, e.g. in meteorology and plasma physics, can be very fruitful.
Stenflo, L., Shukla, P.K.
openaire   +5 more sources