Results 91 to 100 of about 104,092 (306)

Acoustic liner optimisation and noise propagation through turbofan engine intake ducts

, 2013
The research in this thesis explores the prediction of fan noise propagation through turbofan engine intakes and its radiation to the far-field. The performance of acoustic liners installed in intakes to attenuate noise is the focus of the study.
Kewin, Matthew Fergus
core  

Benchmarking Coaxial and Angular Optical Emission Spectroscopy With Recommendations for Reliable Compositional In Situ Monitoring During Laser Powder Bed Fusion

Advanced Materials Technologies, EarlyView.
ABSTRACT Real‐time insight into local chemistry is critical for reliable part quality in additive manufacturing, especially laser powder bed fusion (PBF‑LB/M), where rapid thermal cycles and localized evaporation can undermine part performance. Optical emission spectroscopy (OES) offers non‑intrusive, in situ plume monitoring, but detection geometry ...
Philipp Gabriel, Bastian Jülich, Anna Rosa Ziefuss, Florian Eibl, Stephan Barcikowski   +4 more
wiley   +1 more source

State of the Art of Low‐Frequency Acoustic Modulation: Intensity Enhancement and Directional Control

Advanced Science
High‐intensity low‐frequency acoustic sources with directivity play a significant role in various fields such as medical treatment, underwater communication, and environmental monitoring.
Jingsong Xu, Yunfeng Ye, Tao Dong, Zhaochu Yang, Nuno Miguel Matos Pires, Yu Zhou, Fuyu Tao, Jin Wang, Junshan Zhang, Guoxi Luo, Libo Zhao, Qi Mao, Yangtao Wang, Zhuangde Jiang   +13 more
doaj   +1 more source

Acoustic optimisation and prediction of sound propagation in turbofan engine ducts

, 2010
The research presented in this thesis explores the prediction of noise propagation andradiation in turbofan engine intakes and bypass ducts, and the optimisation of noise attenuationby using acoustic liners.
Achunche, Iansteel Mukum
core  

Simulating the effect of acoustic treatment types for residential balconies with road traffic noise

, 2014
Development of design guides to estimate the difference in speech interference level due to road traffic noise between a reference position and balcony position or façade position is explored.
Demirbilek, F. Nur, Naish, Daniel A., Tan, Andy   +2 more
core   +1 more source

Recent Advances of Slip Sensors for Smart Robotics

Advanced Materials Technologies, EarlyView.
This review summarizes recent progress in robotic slip sensors across mechanical, electrical, thermal, optical, magnetic, and acoustic mechanisms, offering a comprehensive reference for the selection of slip sensors in robotic applications. In addition, current challenges and emerging trends are identified to advance the development of robust, adaptive,
Xingyu Zhang, Liao Wu, Shuai He, Zhao Sha, Yuwan Huang, Shuying Wu, Dewei Chu, Chun H. Wang, Shuhua Peng   +8 more
wiley   +1 more source

New Model for Estimating the Volume of Martensite Transformed Using Acoustic Emission Measurements During an Induction Hardening Process

Metals
The accurate detection and quantification of martensitic transformation in steel during quenching are essential for controlling the resulting material properties. Numerous studies have investigated this phenomenon using Acoustic Emission (AE) techniques,
Erlantz Sola Llanos, Rafael Rodríguez, Marcos Aguirre, Carmelo Javier Luis-Pérez, Mario Javier Cabello   +4 more
doaj   +1 more source

Preliminary study of acoustic analysis for evaluating speech-aid oral prostheses: Characteristic dips in octave spectrum for comparison of nasality

Journal of the Formosan Medical Association, 2015
Acoustic analysis is often used in speech evaluation but seldom for the evaluation of oral prostheses designed for reconstruction of surgical defect.
Yen-Liang Chang, Chao-Ho Hung, Po-Yueh Chen, Wei-Chang Chen, Shih-Han Hung   +4 more
doaj   +1 more source

Aerodynamics and aeroacoustics of slat tracks

, 2009
An overview on the progress of the research work on the aerodynamics and aeroacoustics of a three-dimensional multi-element wing with slat track is presented.
Khanal, Bidur
core  

Prediction and control of sound propagation in turbofan engine bypass ducts [PDF]

, 2007
This thesis contains original research into the propagation of sound in acoustically lined ductswith flow. The motivation for this work is the requirement to predict the sound attenuation ofacoustic liners in the bypass duct of modern turbofan ...
Brooks, Christopher James
core