Acta Acustica united with Acustica最新文献_第6页

Construction of Ground Subtracks for Aircraft Noise Calculations Using an Estimate of Lateral Flight Dispersion 利用横向飞行频散估算计算飞机噪声的地面子轨道建设

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/aaa.919358

Olivier Schwab

{"title":"Construction of Ground Subtracks for Aircraft Noise Calculations Using an Estimate of Lateral Flight Dispersion","authors":"Olivier Schwab","doi":"10.3813/aaa.919358","DOIUrl":"https://doi.org/10.3813/aaa.919358","url":null,"abstract":"In the absence of position data such as radar data, aircraft noise calculations usually rely on the definition of flight geometries in terms of flight track and flight profile data. Typically, the ground track is constructed as a backbone track with a number of subtracks accounting\u0000 for the lateral flight dispersion. Depending on the nature of the tracks, for instance when considering diverging tracks compared to very narrow tracks, the number of subtracks needs to be such that smooth noise contours and footprints are computed, putting a requirement on the minimum number\u0000 of subtracks needed. In practice however, as the tracks need to be digitized by expert hand, the number of available subtracks is often limited. Furthermore, the location of the subtracks is often unknown, requiring corridor boundaries to be estimated and to be translated into subtrack locations.\u0000 This paper presents a method for the construction of the required number of subtracks based on an estimate of lateral flight dispersion. Two cases are envisioned: the first being an estimate of the lateral flight dispersion using a set of three pre-existing subtracks (one backbone track and\u0000 left/right subtracks), the second being an estimate using a backbone track and corridor boundaries. The method uses geometric matching of the original tracks, followed by an estimation of the local lateral track dispersion. The lateral distribution function is then used for the construction\u0000 of new subtracks. A series of aircraft noise calculations using diff erent numbers of subtracks are shown, showcasing the influence of the number of subtracks on the noise contours, depending on the nature of the tracks (e.g.situations with tight turns).","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"368 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75509832","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

Applicability of Artificial Neural Network to Estimate Sound Transmission Loss of Ultrafine Glass Fiber Felts 人工神经网络估算超细玻璃纤维毡声传输损失的适用性

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919345

Fei Wang, Zhaofeng Chen, Cao Wu

引用次数: 2

Implementation of the Nodal Discontinuous Galerkin Method for the Plate Vibration Problem using Linear Elasticity Equations 用线性弹性方程求解板振动问题的节点不连续伽辽金法

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919347

I. Sihar, M. Hornikx

{"title":"Implementation of the Nodal Discontinuous Galerkin Method for the Plate Vibration Problem using Linear Elasticity Equations","authors":"I. Sihar, M. Hornikx","doi":"10.3813/AAA.919347","DOIUrl":"https://doi.org/10.3813/AAA.919347","url":null,"abstract":"This work presents a numerical solution of the forced plate vibration problem using the nodal discontinuous Galerkin (DG) method. The plate is modelled as a three-dimensional domain, and its vibration is governed by the linear elasticity equations. The nodal DG method discretises the\u0000 spatial domain and computes the spatial derivatives of the equations element-wise, while the time integration is conducted using the Runge-Kutta method. This method is in particular of interest as it is very favourable to carry out the computation by a parallel implementation. Several aspects\u0000 regarding the numerical implementation such as the plate boundary conditions, the point force excitation, and the upwind numerical flux are presented. The numerical results are validated for rectangular concrete plates with different sets of boundary conditions and thicknesses, by a comparison\u0000 with the exact mobilities that are derived from the classical plate theory (CPT) and the first order shear deformation theory (FSDT). The plate thickness is varied to understand its effect regarding the comparison with the CPT. An excellent agreement between the numerical solution and the\u0000 FSDT was found. The agreement with the CPT occurs only at the first couple of resonance frequencies, and as the plate is getting thinner. Furthermore, the numerical example is extended to an L-shaped concrete plate. The mobility is then compared with the mobilities obtained by the CPT, FSDT,\u0000 and linear elasticity equations.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73624781","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

Investigating Clarinet Articulation Using a Physical Model and an Artificial Blowing Machine 用物理模型和人工吹风机研究单簧管的发音

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919348

V. Chatziioannou, Sebastian Schmutzhard, Montserrat Pàmies-Vilà, A. Hofmann

引用次数: 10

Hydrodynamics and Hydroacoustics Investigation of a Blade Profile in a Hubless Propeller System Based on a Hybrid Approach 基于混合方法的无轮毂螺旋桨系统叶型水动力与水声研究

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919341

H. Sultani, M. Hieke, O. Estorff, M. Witte, F. Wurm

引用次数: 1

The Ambisonic Recordings of Typical Environments (ARTE) Database 典型环境的双声录音(ARTE)数据库

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919349

Adam Weisser, J. Buchholz, Chris Oreinos, Javier Badajoz-Davila, James Galloway, Timothy Beechey, G. Keidser

{"title":"The Ambisonic Recordings of Typical Environments (ARTE) Database","authors":"Adam Weisser, J. Buchholz, Chris Oreinos, Javier Badajoz-Davila, James Galloway, Timothy Beechey, G. Keidser","doi":"10.3813/AAA.919349","DOIUrl":"https://doi.org/10.3813/AAA.919349","url":null,"abstract":"Everyday listening environments are characterized by far more complex spatial, spectral and temporal sound field distributions than the acoustic stimuli that are typically employed in controlled laboratory settings. As such, the reproduction of acoustic listening environments has become\u0000 important for several research avenues related to sound perception, such as hearing loss rehabilitation, soundscapes, speech communication, auditory scene analysis, automatic scene classification, and room acoustics. However, the recordings of acoustic environments that are used as test material\u0000 in these research areas are usually designed specifically for one study, or are provided in custom databases that cannot be universally adapted, beyond their original application. In this work we present the Ambisonic Recordings of Typical Environments (ARTE) database, which addresses several\u0000 research needs simultaneously: realistic audio recordings that can be reproduced in 3D, 2D, or binaurally, with known acoustic properties, including absolute level and room impulse response. Multichannel higher-order ambisonic recordings of 13 realistic typical environments (e.g., office,\u0000 cafè, dinner party, train station) were processed, acoustically analyzed, and subjectively evaluated to determine their perceived identity. The recordings are delivered in a generic format that may be reproduced with different hardware setups, and may also be used in binaural, or single-channel\u0000 setups. Room impulse responses, as well as detailed acoustic analyses, of all environments supplement the recordings. The database is made open to the research community with the explicit intention to expand it in the future and include more scenes.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77868629","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: 21

Design Optimisation of Acoustic Absorbers with Cross-Like Pores Via a Homogenisation Method 基于均匀化方法的交叉孔吸声器优化设计

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919344

N. Gorbushin, V. Nguyen, S. Naili

引用次数: 3

Reduction of Sound Transmission Through Finite Clamped Metamaterial-Based Double-Wall Sandwich Plates with Poroelastic Cores 有限箝位多孔弹芯超材料双壁夹层板的声传输减少

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/aaa.919365

Jingru Li, Peng Yang, Sheng Li

{"title":"Reduction of Sound Transmission Through Finite Clamped Metamaterial-Based Double-Wall Sandwich Plates with Poroelastic Cores","authors":"Jingru Li, Peng Yang, Sheng Li","doi":"10.3813/aaa.919365","DOIUrl":"https://doi.org/10.3813/aaa.919365","url":null,"abstract":"Finite structures play a more realistic role in applications designed for sound and vibration isolation. Doublepanel structure with poroelastic cores is able to exhibit a superior sound insulation performance in mid-high frequency range, while is relatively inferior to isolate waves\u0000 at low frequencies. In order to further reduce sound transmission at low frequencies and cater for the actual situation, this paper decides to introduce the metamaterial concept into finite double-wall sandwich plates and presents an analytical model to calculate the sound transmission loss\u0000 through the metamaterial-based double-panel with fully clamped boundary conditions. The metamaterial-based double-wall sandwich plates are constructed by replacing the bare panel with the metamaterial plate, consisting of a homogeneous plate and periodically attached local resonators. Biot's\u0000 theory is used to examine the wave propagation in the poroelastic medium. The vibro-acoustic problem of the proposed sandwich plate is solved by employing the modal superposition theory and the Galerkin method. Numerical results show that the sound transmission is significantly reduced at\u0000 low frequencies. Unique phenomena caused by attached local resonators are explained and the eff ects of resonator inerter, incident angles and damping on the sound insulation properties are also studied.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88006667","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

Erratum to sonROAD18: Swiss Implementation of the CNOSSOS-EU Road Traffic Noise Emission Model sonROAD18的勘误:瑞士实施的欧盟道路交通噪音排放模型

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/AAA.919351

K. Heutschi, B. Locher, Michael Gerber

引用次数: 0

New Investigations into Measurement Techniques Using the Pendulous Hammer to Assess Acoustic Insulation in Relation to User-Generated Noise in Residential Buildings 用摆锤测量技术评价住宅建筑中用户产生的噪声的隔声性能的新研究

Acta Acustica united with Acustica Pub Date : 2019-07-01 DOI: 10.3813/aaa.919359

K. Eggenschwiler, Vincent Sperdin, C. Hof, Stefan Schoenwald

{"title":"New Investigations into Measurement Techniques Using the Pendulous Hammer to Assess Acoustic Insulation in Relation to User-Generated Noise in Residential Buildings","authors":"K. Eggenschwiler, Vincent Sperdin, C. Hof, Stefan Schoenwald","doi":"10.3813/aaa.919359","DOIUrl":"https://doi.org/10.3813/aaa.919359","url":null,"abstract":"With the release of the revised version of the Swiss standard SIA 181:2006 \"Protection Against Noise in Buildings\", a measurement technique was introduced for simulating user-generated noise in bathtubs, shower cubicles, wash basins etc. employing a pendulous hammer. Despite the undoubted\u0000 advantages of the measurement method, over the past few years questions have increasingly been raised regarding various issues involved in its use. The characteristics of the pendulous hammer are insufficiently well specified in the standard and a procedure specifying a periodic check of the\u0000 instrument is lacking. The measurement method itself is described in inadequate detail, so that (for example) depending on the choice of the excitation, potentially very diff erent results may be obtained. In addition, no information is given regarding the measurement uncertainty. The standard\u0000 gives level corrections for diff erent excitation scenarios. This allows a comparison of the diff erence between the level of the original noise and that generated by the pendulous hammer. The validity of these level corrections is now, to a certain extent, being challenged. In addition, it\u0000 has been suggested that – depending on the constructional details - the airborne noise emitted by acoustic radiation from the component under investigation is excessive, thereby potentially falsifying the measured values. These issues have been investigated by Empa and, based on a comprehensive\u0000 set of laboratory and field measurements, clarified. Measurement protocols are given for various components, and the measurement uncertainty has been evaluated. The eff ect of airborne noise has been shown to be acceptable for tests conducted in accordance with the SIA 181 standard. Sufficient\u0000 measurement data is now available to allow the level corrections to be determined. Finally, specifications for the pendulous hammer itself have been formulated.","PeriodicalId":35085,"journal":{"name":"Acta Acustica united with Acustica","volume":"208 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78074497","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