Numerical Analysis on Ultrasonic Sensing Mechanism of Fiber Gratings and their frequency Responses

2021 ◽  
Author(s):  
Xianmei Wu ◽  
Jiayi Chen ◽  
Qi Yang ◽  
Bingwen An ◽  
Jinying Zhang
Keyword(s):  
Numerical Analysis ◽  
Fiber Gratings ◽  
Sensing Mechanism ◽  
Frequency Responses ◽  
Ultrasonic Sensing

Experimental and Numerical Analysis of Frequency Responses of Sandwich Structures

2021 ◽  
pp. 173-181
Author(s):  
Hamamed Najah ◽  
Hentati Hamdi ◽  
Bouaziz Slim ◽  
Haddar Mohamed ◽  
El Guerjouma Rachid ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Sandwich Structures ◽  
Frequency Responses

scholarly journals Modelling of Evanescent Field Scattering

Proceedings ◽  
2020 ◽  
Vol 56 (1) ◽  
pp. 16
Author(s):  
Andreas Tortschanoff ◽  
Marcus Baumgart ◽  
Jaka Pribošek
Keyword(s):  
Numerical Analysis ◽  
Single Particle ◽  
Evanescent Field ◽  
Promising Method ◽  
Analytical Models ◽  
Particle Scattering ◽  
Particle Detection ◽  
Sensing Mechanism ◽  
Single Particle Detection

Evanescent field particle scattering is a promising method for single particle detection. In this study, we performed a detailed numerical analysis to show the possibilities and limitations of analytical models for predicting the capabilities of this sensing mechanism.

scholarly journals Numerical analysis of the dynamic frequency responses of damaged micro-lattice core sandwich plates

2019 ◽  
Vol 55 (1-2) ◽  
pp. 31-41 ◽  
Author(s):  
Matías Braun ◽  
Inés Ivañez ◽  
Josué Aranda-Ruiz
Keyword(s):  
Numerical Analysis ◽  
Damage Identification ◽  
Lattice Structure ◽  
Sandwich Plates ◽  
Element Analysis ◽  
Frequency Responses ◽  
The Finite Element Analysis ◽  
Lattice Core ◽  
Non Destructive ◽  
Dynamic Frequency

In this work, a numerical analysis of the dynamic frequency responses of sandwich plates with micro-lattice core is presented. The finite element analysis is implemented in the commercial software Abaqus/Standard, calculating the natural frequencies and eigenmodes of sandwich plates containing defects on the micro-lattice structure. In order to include the presence of defects, an aleatory algorithm is developed in MATLAB. The effect of the damage percentage, cell type, cell size and material on the frequency and modal responses of the sandwich plates is highlighted. Results show that the dynamic frequency response may be useful for analysing practical issues related to non-destructive damage identification of imperfections in the micro-lattice core of sandwich structures.

Real Ear Sound Pressure Levels Developed by Three Portable Stereo System Earphones

1992 ◽  
Vol 1 (4) ◽  
pp. 52-55 ◽  
Author(s):  
Gail L. MacLean ◽  
Andrew Stuart ◽  
Robert Stenstrom
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Low Frequency ◽  
Test System ◽  
Output Frequency ◽  
Frequency Effects ◽  
Adult Men ◽  
Frequency Responses ◽  
Significant Difference ◽  
Sound Pressure Levels

Differences in real ear sound pressure levels (SPLs) with three portable stereo system (PSS) earphones (supraaural [Sony Model MDR-44], semiaural [Sony Model MDR-A15L], and insert [Sony Model MDR-E225]) were investigated. Twelve adult men served as subjects. Frequency response, high frequency average (HFA) output, peak output, peak output frequency, and overall RMS output for each PSS earphone were obtained with a probe tube microphone system (Fonix 6500 Hearing Aid Test System). Results indicated a significant difference in mean RMS outputs with nonsignificant differences in mean HFA outputs, peak outputs, and peak output frequencies among PSS earphones. Differences in mean overall RMS outputs were attributed to differences in low-frequency effects that were observed among the frequency responses of the three PSS earphones. It is suggested that one cannot assume equivalent real ear SPLs, with equivalent inputs, among different styles of PSS earphones.

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