Acta Acustica united with Acustica最新文献_第4页

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

Study on Natural Frequencies of Transverse Free Vibration of Functionally Graded Axis Beams by the Differential Quadrature Method 用微分正交法研究功能梯度轴梁横向自由振动固有频率

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919388

Jinlong Zhang, Liaojun Zhang, R. Ge, Li Yang, J. Xia

引用次数: 0

Measurement of Sound Absorption Using a Single Fixed Microphone in a Circular Pulse-Tube 在圆形脉冲管内使用单个固定麦克风测量吸声

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919399

Zheng-yu Wei, H. Hou, Nansha Gao, Yunke Huang, Jianhua Yang

引用次数: 1

Numerical Modelling of Boundary Layers and Far Field Acoustic Propagation in Thermoviscous Fluid 热粘性流体边界层及远场声波传播数值模拟

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919392

N. Joly, P. Honzík

引用次数: 1

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

Role of Plate Length on Noise from Wall Jets 板长对壁面射流噪声的影响

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919374

Rahul S. Arackal, T. Jothi

{"title":"Role of Plate Length on Noise from Wall Jets","authors":"Rahul S. Arackal, T. Jothi","doi":"10.3813/aaa.919374","DOIUrl":"https://doi.org/10.3813/aaa.919374","url":null,"abstract":"The present study experimentally investigates the effect of the growth of inner layer on noise emission characteristics of wall jets. The plate length L considered for the current study vary in the range of L/h = 2.5 to 30, where h is the nozzle height. The jet\u0000 is issued from a nozzle having the exit dimensions of 20 cm in width and 2 cm in height h. The jet Reynolds number, based on the nozzle height and jet exit velocity Uj, is varied up to 7.0 · 104. Acoustic measurements revealed the distinct variations in\u0000 the noise levels with different plate lengths. The L/h = 2.5 wall jet has an increase in noise levels by around 10 dB compared to that of a free jet (background noise). Wall jets in the range of L/h = 5 to 20 radiate higher noise levels compared to other plates, while the least\u0000 noise emissions are observed from fully developed wall jets (L/h > 20). The significant sources identified for noise emissions are the trailing edge and the secondary shear layer in the wall jets. The low frequency noise corresponding to the Strouhal number (based on h) below\u0000 0.2 is characterized as the trailing edge noise. The spectra of the wall jets collapse in the Strouhal number range (based on the inner layer thickness of wall jets) of ∼0.2 to 1.0 indicating the secondary shear layer noise of wall jets.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80490248","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

Low-Frequency Guided Wave Quantitative Reconstruction of Corrosion in Plates, 1D Diffraction Problem 板材腐蚀的低频导波定量重建，一维衍射问题

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919378

William Cailly, H. Walaszek, Sébastien Brzuchacz, Fan Zhang, P. Lasaygues

{"title":"Low-Frequency Guided Wave Quantitative Reconstruction of Corrosion in Plates, 1D Diffraction Problem","authors":"William Cailly, H. Walaszek, Sébastien Brzuchacz, Fan Zhang, P. Lasaygues","doi":"10.3813/aaa.919378","DOIUrl":"https://doi.org/10.3813/aaa.919378","url":null,"abstract":"Guided Wave Tomography is a nondestructive imaging technique that consists in inverting guided wave propagation data to localize defects. In particular, this technique should provide quantitative information about the corrosion state of metallic plates by reconstructing a thickness\u0000 map from diffraction or time-of-flight measurements. In this paper we first present an analytical framework for corrosion profile reconstruction considering the 1D case. Due to the fact that, in practice, the low frequency ultrasound range (typically 50 to 100 kHz) is used for long range inspections,\u0000 the first-order shear deformation approximation is relevant for plate thicknesses encountered in metallic structures. This leads to an analytical description of guided wave phenomena: diffraction, refraction and mode conversion, for 5 modes: A0, S0, SH0, A1 and SH1. The validity of an analytical\u0000 approach to modeling thickness loss defects, in particular the validity of the first Born approximation, is discussed by comparing with elastodynamic numerical results. The comparison results show that the nonlinear behavior with depth increase, or width increase, of the defects (distortion)\u0000 can be fully described using a multimodal high order Born series. Consequently, a consistent iterative inversion Born series based algorithm can be used to deal with the reconstruction of strong thickness losses.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90422286","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: 1

High-Frequency Diffraction of a Point Source Field by a Strongly Elongated Elliptic Cylinder 强细长椭圆圆柱对点源场的高频衍射

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919372

I. Andronov

引用次数: 0

Excitation of Non-Wave Modes by Sound of Arbitrary Frequency in a Chemically Reacting Gas 化学反应气体中任意频率声音对非波模式的激发

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI: 10.3813/aaa.919373

A. Perelomova

引用次数: 2