Results 1 to 10 of about 637 (155)

Experimental and numerical study of Conoscopic Interferometry sensitivity for optimal acoustic pulse detection in ultrafast acoustics [PDF]

Photoacoustics, 2023
Conoscopic interferometry is a promising detection technique for ultrafast acoustics. By focusing a probe beam through a birefringent crystal before passing it through a polarizer, conoscopic interferences sculpt the spatial profile of the beam.
Martin Robin, Ruben Guis, Mustafa Umit Arabul, Zili Zhou, Nitesh Pandey, Gerard J. Verbiest   +5 more
doaj   +2 more sources

Broadband Response Diaphragm Materials for Human Acoustics Engineering [PDF]

Small
AbstractHigh‐performance fiber‐reinforced composite materials demonstrate great potential for manufacturing diaphragms in human‐engineered acoustic loudspeakers. However, the notable scarcity of high‐quality fibers and the uncontrollable nature of the diaphragm structure limit the production of high‐quality sound that conforms to human hearing. In this
Hongfu Bi, Yuan Wei, Yang Zhou, Yingying He, Chunyu Wang, Cheng Zhang, Jie Chen, Jiawei Cao, Xiaofeng Ding, Jianming Zhou, Gang Chen   +10 more
openalex   +3 more sources

Performance Research and Optimization of Sound Insulation Hood of Air Compressor Unit

Applied Sciences, 2021
The noise control of a compressor has always been a hot spot in the field of industrial application. In this paper, the air inlet structure of the sound insulation hood of an air compressor unit was studied and improved. Acoustic finite element numerical
Huagen Wu, Yuqi Shen, Mengtao Liang, Jiankang Liu, Jingjing Wu, Zhuo Li   +5 more
doaj   +1 more source

Extraction and Analysis of Respiratory Motion Using a Comprehensive Wearable Health Monitoring System

Sensors, 2021
Respiratory activity is an important vital sign of life that can indicate health status. Diseases such as bronchitis, emphysema, pneumonia and coronavirus cause respiratory disorders that affect the respiratory systems.
Uduak Z. George, Kee S. Moon, Sung Q. Lee   +2 more
doaj   +1 more source

Ultraminiature AlN diaphragm acoustic transducer [PDF]

Applied Physics Letters, 2020
Piezoelectric acoustic transducers consisting of a circular aluminum nitride and silicon nitride unimorph diaphragm and an encapsulated air-filled back cavity are reported. Analytical and finite element analysis models are used to design the transducer to achieve low minimum detectable pressure (MDP) within chosen size restrictions.
Alison E. Hake, Chuming Zhao, Lichuan Ping, Karl Grosh   +3 more
openaire   +2 more sources

The Fabrication and Indentation of Cubic Silicon Carbide Diaphragm for Acoustic Sensing [PDF]

Micromachines, 2021
In this study, 550 nm thick cubic silicon carbide square diaphragms were back etched from Si substrate. Then, indentation was carried out to samples with varying dimensions, indentation locations, and loads. The influence of three parameters is documented by analyzing load-displacement curves.
Siti Aisyah Zawawi, Azrul Azlan Hamzah, Burhanuddin Yeop Majlis, Faisal Mohd-Yasin   +3 more
openaire   +5 more sources

A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm

Sensors, 2023
This study presents a grating interferometric acoustic sensor based on a flexible polymer diaphragm. A flexible-diaphragm acoustic sensor based on grating interferometry (GI) is proposed through design, fabrication and experimental demonstration. A gold-coated polyethylene terephthalate diaphragm was used for the sensor prototype.
Linsen Xiong, Zhi-mei Qi
openaire   +3 more sources

Multiphysics Modeling of a Synthetic Jet Actuator in Operation

Actuators
Active flow control is a promising technology for reducing noise, emissions, and power consumption in various applications. To better understand the performance of synthetic jet actuators, a computational model that couples structural mechanics with ...
Matthew G. M. Butler, Alis Ekmekci, Pierre E. Sullivan   +2 more
doaj   +1 more source

Externally induced low frequency tool chatter for optimizing the FSW weld of Al–SiC matrix

Discover Applied Sciences
Linguistically synonymous, but from an engineer’s perspective vibration is a quantifiable value whereas chatter is a resultant reaction individual to the setup assembly, and is generated mostly during material removal processes in the form of audible ...
T. Madhavi, D. V. Ravi Shankar, K. Prasanna Lakshmi, Perumalla Janaki Ramulu   +3 more
doaj   +1 more source

Design and Optimization of Piezoelectric Diaphragm for Self-Powered Acoustic Sensor

Engineering Research Express, 2023
Abstract A self-powered piezoelectric material-based sensor has miniaturization and mass production capabilities. The finite element analysis shows results prior to device fabrication, which discover potential defects in the design, improve sensor performance, and lead to cost-effective fabrication.
Mohini Sawane, Mahanth Prasad
openaire   +1 more source