Archives of Acoustics最新文献_第6页

Evaluation of the Acoustic Performance of Porous Materials Lined Ducts with Geometric Discontinuities 具有几何不连续性的多孔材料内衬管道的声学性能评估

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.141652

D. Tounsi, W. Taktak, R. Dhief, M. Haddar

{"title":"Evaluation of the Acoustic Performance of Porous Materials Lined Ducts with Geometric Discontinuities","authors":"D. Tounsi, W. Taktak, R. Dhief, M. Haddar","doi":"10.24425/aoa.2022.141652","DOIUrl":"https://doi.org/10.24425/aoa.2022.141652","url":null,"abstract":"Duct silencers provide eﬀective noise reduction for heating, ventilation and air conditioning systems. These silencers can achieve an excellent sound attenuation through the attributes of their design. The reactive silencer works on the principle of high reﬂection of sound waves at low frequencies. On the other hand, the dissipative silencer works on the principle of sound absorption, which is very eﬀective at high-frequencies. Combining these two kinds of silencers allowed covering the whole frequency range. In this paper, the eﬀect of liner characteristics composed of a perforated plate backed by a porous material and geometry discontinuities on the acoustic power attenuation of lined ducts is evaluated. This objective is achieved by using a numerical model to compute the multimodal scattering matrix, thus allowing deducing the acoustic power attenuation. The numerical results are obtained for six conﬁgurations, including cases of narrowing and widening of a radius duct with sudden or progressive discontinuities. Numerical acoustic power attenuation shows the relative inﬂuence of the variation in the values of each parameter of the liner, and of each type of radius discontinuities of ducts.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42933707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

67th Open Seminar on Acoustics September 14 – 17, 2021 第67届声学公开研讨会，2021年9月14 - 17日

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2021.139646

Paweł, K. Anna, Jędrzej, Adam

引用次数: 0

Professor Grażyna Grelowska 源代码和ż教授yna Grelowska

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142901

引用次数: 0

Experimental Determination of a Reflective Muffler Scattering Matrix for Single-Mode Excitation 单模激励下反射消声器散射矩阵的实验确定

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2021.139643

Łukasz Gorazd

{"title":"Experimental Determination of a Reflective Muffler Scattering Matrix for Single-Mode Excitation","authors":"Łukasz Gorazd","doi":"10.24425/aoa.2021.139643","DOIUrl":"https://doi.org/10.24425/aoa.2021.139643","url":null,"abstract":"The aim of the paper is to experimentally determine the scattering matrix S of an example reﬂective muﬄer of cylindrical geometry for Helmholtz number exceeding the plane wave propagation. Determining the scattering matrix of an acoustic systems is a new and increasingly used approach in the assessment of reduction of noise propagating inside duct-like elements of heating, ventilation and air conditioning systems (HVAC). The scattering matrix of an acoustic system provides all necessary information on the propagation of wave through it. In case of the analysed reﬂective silencer, considered as a two-port system, the noise reduction was determined by calculating the transmission loss parameter (TL) based on the scattering matrix ( S ). Measurements were carried out in two planes of the cross-section of pipes connected to the muﬄer. Thepaper presents results of the scattering matrix evaluation for the wave composed of the plane wave (mode (0,0)) and the ﬁrst radial mode (0,1), each of which was generated separately using the self-designed and constructed single-mode generator. The gain of proceeding measurements for single modes stems from the fact that theoretically, calculation of the S -matrix does not require, as will be presented in the paper, calculation of the measurement data inverse matrix. Moreover, if single mode sound ﬁelds are well determined, it ensures error minimization. The presented measurement results refer to an example of a duct like system with a reﬂective muﬄer for which the scattering matrix S was determined. The acoustic phenomena inside such a system can be scaled by the parameter ka .","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44229876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Asymmetrical PZT applied to active reduction of asymmetrically vibrating beam – semi-analytical solution 非对称压电陶瓷在非对称振动梁主动还原中的应用——半解析解

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142891

A. Brański, Romuald Kuras

{"title":"Asymmetrical PZT applied to active reduction of asymmetrically vibrating beam – semi-analytical solution","authors":"A. Brański, Romuald Kuras","doi":"10.24425/aoa.2022.142891","DOIUrl":"https://doi.org/10.24425/aoa.2022.142891","url":null,"abstract":"The article extended the idea of active vibration reduction of beams with symmetric modes to beams with asymmetric modes. In the case of symmetric modes, the symmetric PZT (s-PZT) was used, and the optimization of the problem led to the location of the s-PZT centre at the point with the greatest beam curvature. In the latter case, the asymmetric modes that occur due to the addition of the point mass cause an asymmetric distribution of the bending moment and transversal displacement of a beam. In this case, the optimal approach to the active vibration reduction requires both new asymmetric PZT (a-PZT) and its new particular distribution on the beam. It has been mathematically determined that the a-PZT asymmetry point (a-point), ought to be placed at the point of maximum beam bending moment. The a-PZT asymmetry was found mathematically by minimizing the amplitude of the vibrations. As a result, it was possible to formulate the criterion of the maximum bending moment of the beam. The numerical calculations conﬁrmed theoretical considerations. So, it was shown that in the case of asymmetric vibrations, the a-PZTs reduced vibrations more eﬃciently than the s-PZT.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43251018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluation of the Effect of Uncertainties on the Acoustic Behavior of a Porous Material Located in a Duct Element Using the Monte Carlo Method 用蒙特卡罗方法评价不确定性对位于管道单元中的多孔材料声学特性的影响

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2023.144266

引用次数: 0

Professor Józef Lewandowski 约泽夫·莱万多夫斯基教授

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142902

引用次数: 0

The effect of a concentrated mass on the acoustic power and the resonant frequencies of a circular plate 集中质量对圆板声功率和谐振频率的影响

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142895

W. Rdzanek, K. Szemela

引用次数: 1

Airborne and Structure-Borne Noise Control in the MB Truck Cabin Interior by the Noise Reduction in the Transmission Path 基于传输路径降噪的MB货车舱内机载与结构噪声控制

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142908

N. Mohammadi

{"title":"Airborne and Structure-Borne Noise Control in the MB Truck Cabin Interior by the Noise Reduction in the Transmission Path","authors":"N. Mohammadi","doi":"10.24425/aoa.2022.142908","DOIUrl":"https://doi.org/10.24425/aoa.2022.142908","url":null,"abstract":"In the current study, investigations are made to control the MB truck cabin interior noise by reducing noise in the transmission path. The main sources of cabin noise include the engine, exhaust system, air inlet system, driveline system, and tyres (especially at higher speeds). Furthermore, vibrations of the body and interior parts of the truck may signiﬁcantly impact the overall in-cabin sound level. Noise is transmitted into the cabin via air (airborne noise) and cabin structure (structure-borne noise). In the noise treatment phase, noise transmission paths are considered. A viscoelastic layer damping material is used to reduce the vibration amplitude of the cabin back wall. The overall loss factor and vibration amplitude reduction ratio for the structure treated is calculated. Computational results are then compared with the values obtained by the experimental modal analysis results. Choosing the suitable material and thickness can signiﬁcantly reduce the vibration amplitude. A sound barrier, silicon adhesive, and foam are also utilised for noise control in the transmission path. The eﬀectiveness of the mentioned acoustic materials on cabin noise reduction is evaluated experimentally. The experimental SPL values are reported in the frequency range of 20 Hz–20 kHz based on a 1/3 octave ﬁlter. The experimental results show that using acoustics materials reduces the overall in-cabin sound level for a wide range of frequencies.","PeriodicalId":8149,"journal":{"name":"Archives of Acoustics","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47155962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

2D Modeling of Wave Propagation in Shallow Water by the Method of Characteristics 特征法在浅水中波浪传播的二维模拟

IF 0.9 4区物理与天体物理

Archives of Acoustics Pub Date : 2023-07-20 DOI: 10.24425/aoa.2022.142014

M. Khalilabadi

引用次数: 0