scholarly journals Aeroacustic and Vibroacoustic Advancement in Aerospace and Automotive Systems

2020 ◽  
Vol 10 (11) ◽  
pp. 3853
Author(s):  
Roberto Citarella ◽  
Luigi Federico ◽  
Mattia Barbarino
Keyword(s):  
Sound Absorption ◽  
Experimental Studies ◽  
Acoustic Emissions ◽  
Direct Impact ◽  
Special Issue ◽  
Duct Acoustics ◽  
Commercial Success ◽  
Automotive Systems ◽  
Properties Of Materials ◽  
Cabin Interior

This Special Issue highlights the latest enhancements in the abatement of noise and vibrations of aerospace and automotive systems. The reduction of acoustic emissions and the improvement of cabin interior comfort are on the path of all major transportation industries, having a direct impact on customer satisfaction and, consequently, the commercial success of new products. Topics covered in this Special Issue deal with computational, instrumentation and data analysis of noise and vibrations of fixed wing aircrafts, satellites, spacecrafts, automotives and trains, ranging from aerodynamically generated noise to engine noise, sound absorption, cabin acoustic treatments, duct acoustics and vibroacoustic properties of materials. The focus of this Special Issue is also related to industrial aspects, e.g.,: numerical and experimental studies have been performed for an existing and commercialized engine to enable design improvements aimed at reducing noise and vibrations; moreover, an optimization is provided for the design of low vibroacoustic volute centrifugal compressors and fans whose fluids should be strictly kept in the system without any leakage. Existing procedures and algorithms useful to reach the abovementioned objectives in the most efficient way are illustrated in the collected papers.

Method of Testing of Sound Absorption Properties of Materials Intended for Ultrasonic Noise Protection

2013 ◽  
Vol 38 (2) ◽  
pp. 191-195 ◽  
Author(s):  
Dariusz Pleban
Keyword(s):  
Sound Absorption ◽  
Free Field ◽  
Tone Burst ◽  
Mineral Wool ◽  
Frequency Range ◽  
Absorption Properties ◽  
Open Cell Foam ◽  
Properties Of Materials ◽  
Cell Foam

Abstract Efficient ultrasonic noise reduction by using enclosures requires the knowledge of absorbing properties of materials in the frequency range above 4 kHz. However, standardized methods enable determination of absorption coefficients of materials in the frequency range up to 4 kHz. For this reason, it is proposed to carry out measurements of the sound absorption properties of materials in the free field by means of a tone-burst technique in the frequency range from 4 kHz to 40 kHz at angles of incidence varying from 0° to 60°. The absorption coefficient of a material is calculated from the reflection coefficient obtained by reflecting a tone-burst from both a perfectly reflecting panel and a combination of this panel and the sample of the tested material. The tests results show that mineral wool and polyurethane open-cell foam possess very good absorbing properties in this frequency range.

scholarly journals Editorial for Special Issue “Mineral Surface Reactions at the Nanoscale”

Minerals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 185
Author(s):  
Christine Putnis
Keyword(s):  
Surface Reactions ◽  
Experimental Studies ◽  
Analytical Techniques ◽  
Aqueous Fluid ◽  
Mineral Surfaces ◽  
Special Issue ◽  
Mineral Surface ◽  
Electron Microscopies ◽  
Interface Control ◽  
The Earth

Reactions at mineral surfaces are central to all geochemical processes. As minerals comprise the rocks of the Earth, the processes occurring at the mineral–aqueous fluid interface control the evolution of the rocks and, hence, the structure of the crust of the Earth during such processes at metamorphism, metasomatism, and weathering. In recent years, focus has been concentrated on mineral surface reactions made possible through the development of advanced analytical techniques, such as atomic force microscopy (AFM), advanced electron microscopies (SEM and TEM), phase shift interferometry, confocal Raman spectroscopy, advanced synchrotron-based applications, complemented by molecular simulations, to confirm or predict the results of experimental studies. In particular, the development of analytical methods that allow direct observations of mineral–fluid reactions at the nanoscale have revealed new and significant aspects of the kinetics and mechanisms of reactions taking place in fundamental mineral–fluid systems. These experimental and computational studies have enabled new and exciting possibilities to elucidate the mechanisms that govern mineral–fluid reactions, as well as the kinetics of these processes, and, hence, to enhance our ability to predict potential mineral behavior. In this Special Issue “Mineral Surface Reactions at the Nanoscale”, we present 12 contributions that highlight the role and importance of mineral surfaces in varying fields of research.

scholarly journals Editorial for Special Issue “Nanomineralogy”

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 520
Author(s):  
Yiwen Ju ◽  
Quan Wan ◽  
Michael F. Hochella
Keyword(s):  
Special Issue ◽  
Nanoscience And Nanotechnology ◽  
Properties Of Materials

Nanoscience and nanotechnology study the properties of materials within the range 0 [...]

scholarly journals Engineering Bone-Implant Materials

2019 ◽  
Vol 6 (2) ◽  
pp. 51 ◽  
Author(s):  
Mohammad Elahinia ◽  
Hamdy Ibrahim ◽  
Mohammad Javad Mahtabi ◽  
Reza Mehrabi
Keyword(s):  
Experimental Studies ◽  
Special Issue ◽  
Bone Implant ◽  
Implant Materials ◽  
Biomechanical Behavior

This special issue is dedicated to the simulation as well as experimental studies of biomechanical behavior of biomaterials, especially those that are used for bone implant applications [...]

Special issue: Experimental studies in echinococcosis

2008 ◽  
Vol 119 (4) ◽  
pp. 437-438 ◽  
Author(s):  
Andrew Hemphill ◽  
Peter Kern
Keyword(s):  
Experimental Studies ◽  
Special Issue

Mechanical, chemical and sound absorption properties of glass/kenaf/waste tea leaf fiber-reinforced hybrid epoxy composites

2020 ◽  
pp. 152808372095739 ◽  
Author(s):  
L Prabhu ◽  
V Krishnaraj ◽  
S Gokulkumar ◽  
S Sathish ◽  
MR Sanjay ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Hybrid Composites ◽  
Experimental Studies ◽  
Epoxy Composites ◽  
Fiber Reinforced ◽  
Waste Tea ◽  
Kenaf Fibers ◽  
Tea Leaf ◽  
Absorption Characteristics ◽  
Leaf Fiber

This work aims to investigate the mechanical and sound absorption characteristics of industrial waste tea leaf fiber (WTLF), kenaf and E-glass fiber–reinforced hybrid epoxy composites through experimental studies. The WTLF and kenaf fibers were initially treated with 5% sodium hydroxide. Hybrid composites were fabricated by compression molding technique with a composition of 40 wt.% fiber and 60 wt.% matrix. The fabricated hybrid composites were subjected to mechanical and sound absorption studies as per ASTM standards. Results revealed better mechanical properties in the composites with 25 wt.% kenaf and 5 wt.% WTLF, whereas sound absorption characteristics were better for composites containing 25 wt.% WTLF and 5 wt.% kenaf fiber. The surface morphology of the fractured specimens such as fiber pullout and matrix crack was examined using scanning electron microscopy. Spectrum investigation of alkali-treated hybrid composites showed excellent interfacial bonding between the polymer and fiber compared to the untreated fiber.

scholarly journals Emerging Advances in Petrophysics: Porous Media Characterization and Modeling of Multiphase Flow

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 282 ◽  
Author(s):  
Jianchao Cai ◽  
Shuyu Sun ◽  
Ali Habibi ◽  
Zhien Zhang
Keyword(s):  
Porous Media ◽  
Multiphase Flow ◽  
Oil And Gas ◽  
Reservoir Characterization ◽  
Experimental Studies ◽  
Flow Modeling ◽  
Special Issue ◽  
Fractal Approach ◽  
Unconventional Resources ◽  
Oil And Gas Resources

With the ongoing exploration and development of oil and gas resources all around the world, applications of petrophysical methods in natural porous media have attracted great attention. This special issue collects a series of recent studies focused on the application of different petrophysical methods in reservoir characterization, especially for unconventional resources. Wide-ranging topics covered in the introduction include experimental studies, numerical modeling (fractal approach), and multiphase flow modeling/simulations.

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