Acta Acustica united with Acustica最新文献_第3页

Influence of the "Ghost Reed" Simplification on the Bifurcation Diagram of a Saxophone Model “鬼簧”化简对萨克斯模型分岔图的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919409

Tom Colinot, Louis Guillot, C. Vergez, P. Guillemain, Jean-Baptiste Doc, B. Cochelin

引用次数: 8

Edge Fillet Radius Effect on Acoustic Energy in an Ultrasonic Microcontainer for Preparing Nanoemulsion 边缘圆角半径对制备纳米乳超声微容器中声能的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919401

S. M. M. Modarres-Gheisari, M. Mohammadpour, R. Gavagsaz-Ghoachani, P. Safarpour, M. Zandi

{"title":"Edge Fillet Radius Effect on Acoustic Energy in an Ultrasonic Microcontainer for Preparing Nanoemulsion","authors":"S. M. M. Modarres-Gheisari, M. Mohammadpour, R. Gavagsaz-Ghoachani, P. Safarpour, M. Zandi","doi":"10.3813/aaa.919401","DOIUrl":"https://doi.org/10.3813/aaa.919401","url":null,"abstract":"Nanoemulsion preparation and improvement play a pivotal role in the area of pharmaceuticals, food, mechanical, and chemical engineering. The ultrasonic technique is one of the most commonly used methods in preparing nanoemulsion, related to mechanical and electrical engineering. The\u0000 present study aimed to evaluate the effect of edge fillet radius in four different layouts of a cubic ultrasonic microcontainer at different frequencies through 36 simulations by using COMSOL Multiphysics software. To this aim, the simulations were performed in three edge fillet radius values\u0000 of zero, 2.5 and 5 mm, and at the excitation frequencies of 20, 200 and 300 kHz. In this regard, experimental tests were carried out in two modes of: a) regular ultrasonic bath (RUB) and b) filleted-edges ultrasonic bath (FEUB). Based on the simulation and experimental results, the removal\u0000 of sharp edges has a positive influence on propagating waves, leading to an increase in the acoustic energy density at different frequencies and the effect was more significant at lower frequencies and layouts with more PZTs.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81721234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Resonance of a Lined Tire Cavity 衬里轮胎腔体共振的研究

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919400

Yong-Bin Zhang, Q. Yao, Lei Xiao, Xiao-Zheng Zhang, C. Zheng, C. Bi

引用次数: 3

Study on the Properties of Aerodynamic Reference Sound Sources 气动参考声源特性研究

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919377

S. Brezas, V. Wittstock

引用次数: 1

Perceptual Characteristics of Buzz-Saw Aircraft Noise and Its Relationship to Noise Unpleasantness 电锯飞机噪声感知特性及其与噪声不愉快的关系

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919387

J. Otčenášek

引用次数: 1

Effects of High-Intensity Airborne Ultrasound Exposure on Behavioural and Electrophysiological Measures of Auditory Function 高强度航空超声暴露对听觉行为和电生理指标的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/AAA.919395

Samuele Carcagno, A. D. Battista, C. Plack

{"title":"Effects of High-Intensity Airborne Ultrasound Exposure on Behavioural and Electrophysiological Measures of Auditory Function","authors":"Samuele Carcagno, A. D. Battista, C. Plack","doi":"10.3813/AAA.919395","DOIUrl":"https://doi.org/10.3813/AAA.919395","url":null,"abstract":"Regulations on safe ultrasound exposure limits are based on a very limited number of studies, which have only considered audiometric threshold shifts as indicators of hearing deficits. The purpose of the current study was to assess the effects of exposure to high-intensity ultrasound\u0000 on a range of measures of hearing function, which included audiometric thresholds, as well as subclinical measures of hearing deficits: speech-in-noise understanding, supra-threshold auditory brainstem response wave I amplitude and latency, and frequency following response levels to amplitude\u0000 modulated (AM) tones. Changes in these measures were assessed before and after exposure of the left ear to high-intensity ultrasound in a group of nine young listeners. These changes were compared to those observed in a control group of nine young listeners. Exposure consisted in the presentation\u0000 of a 40-kHz AM tone at levels of 105, 110, 115, and 120 dB SPL for 10 minutes at each level, plus an exposure to a 40-kHz unmodulated tone during an ultrasound detection task, for a total duration of 50 seconds. None of the measures of hearing function was found to change significantly more\u0000 for the left compared to the right ear, for participants of the exposure group compared to control participants. Electroencephalographic recordings obtained during exposure to the AM tone did not show significant phase-locked activity at the modulation frequency or at low-frequency subharmonics\u0000 of the ultrasound tone. One out of nine participants was able to perform the ultrasound detection task above chance level, although due to limitations of the experimental setup the mechanism by which she could detect the presentation of the tone remains unclear.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"1032 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77634690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Numerical Modelling of Vibration Characteristics of a Partially Metallized Micro Electromechanical System Resonator Disc 部分金属化微机电系统谐振盘振动特性的数值模拟

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919393

I. Naciri, A. Rguiti, L. Elmaimouni, J. Lefebvre, F. Ratolojanahary, J. Yu, Y. Belkassmi, A. E. Moussati

{"title":"Numerical Modelling of Vibration Characteristics of a Partially Metallized Micro Electromechanical System Resonator Disc","authors":"I. Naciri, A. Rguiti, L. Elmaimouni, J. Lefebvre, F. Ratolojanahary, J. Yu, Y. Belkassmi, A. E. Moussati","doi":"10.3813/aaa.919393","DOIUrl":"https://doi.org/10.3813/aaa.919393","url":null,"abstract":"In this paper, we report an extension of a polynomial and numerical vibrational characterization of an annular piezoelectric disc resonator partially covered with electrodes. The three governing partial differential equations of motion are solved to provide the frequency response of\u0000 the piezoelectric disc using a polynomial approach. This method makes use of Legendre polynomials series to express the mechanical displacement components and the electrical potential which are introduced into the equations of motion of the piezoelectric structure. The principal advantage\u0000 of this method consists of incorporating the electrical source, the boundary and continuity conditions directly into the governing equations by the use of position-dependent physical constants and by a wise choice of the polynomial expansions for the independent variables, the mechanical displacement\u0000 components and the electrical potential. Both harmonic and modal analyses were studied and are presented. Numerical calculations based on the foregoing method were performed to present resonance and anti-resonance frequencies, electromechanical coupling coefficient, field profiles and electrical\u0000 input admittance for PIC151 and PZT5A disc resonators with various metallization rates. The high accuracy and reliability of our approach is confirmed via a comparison of our results with their counterparts reported in literature.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74950831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Changes of Ultrasonic Parameters as a Tool to Determine the Influence of Cooking in Pork Loin Samples 超声参数变化测定煮熟对猪里脊肉样品的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919375

A. González-Mohíno, A. Jiménez, M. Rufo, J. Paniagua, Sonia Venta Nas, L. S. Olegario

引用次数: 6

A Transfer Matrix Model of the IEC 60318-4 Ear Simulator: Application to the Simulation of Earplug Insertion Loss iec60318 -4耳模拟器的传递矩阵模型:在耳塞插入损耗模拟中的应用

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919403

Yu Luan, F. Sgard, S. Benacchio, H. Nélisse, O. Doutres

{"title":"A Transfer Matrix Model of the IEC 60318-4 Ear Simulator: Application to the Simulation of Earplug Insertion Loss","authors":"Yu Luan, F. Sgard, S. Benacchio, H. Nélisse, O. Doutres","doi":"10.3813/aaa.919403","DOIUrl":"https://doi.org/10.3813/aaa.919403","url":null,"abstract":"The IEC 60318-4 ear simulator is used to measure the insertion loss (IL) of earplugs in the ear canal of an acoustical test fixture (ATF) and is designed to represent an average acoustic impedance (in a reference plane) of the human ear. The ear simulator is usually modeled using a\u0000 lumped parameter model (LPM) which has frequency limitations and inadequately accounts for the thermo-viscous effects in the simulator. The simulator numerical models that can better deal with the thermo-viscous phenomena often lack essential geometric details. Most related studies also suffer\u0000 from the lack of experimental validation of the models. Therefore, a transfer matrix (TM) model of the IEC 60318-4 simulator is proposed based on a direct assessment of its geometric dimensions. Such a model is of particular interest for designing artificial ear simulators. The variability\u0000 in the simulator impedance due to the geometric uncertainties is quantified using the Monte Carlo method. The TM model is validated using i) a finite element (FE) model of the simulator and ii) impedance measurements with a sound intensity probe. It is found to better describe the simulator\u0000 impedance above 3 kHz compared to the LPM. The TM model is then coupled to a FE model of an occluded ATF ear canal to simulate the IL of an earplug in the frequency range [100 Hz, 10 kHz]. In the model, the simulator is considered as a cylindrical cavity terminated by an equivalent tympanic\u0000 impedance which is determined from the TM model to simulate the sound pressure measured at the real microphone position (not at the reference plane) in the ATF ear canal. The simulated IL is validated against i) that obtained with a complete FE model of the corresponding system and ii) measurements\u0000 using an ATF. The TM model is shown to better agree with the simulator FE model than the LPM above 6 kHz regarding the earplug IL simulated using this method.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87634224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The Impact of Speech-Irrelevant Head Movements on Speech Intelligibility in Multi-Talker Environments 多语环境下言语无关头部运动对言语可理解性的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919408

I. Frissen, Johannes Scherzer, Hsin-Yun Yao

引用次数: 2