Acoustics (Basel, Switzerland)最新文献_第4页

Experimental Methodology to Characterize the Noise Paths in a Horizontal-Axis Washing Machine 横轴洗衣机噪声路径特性的实验方法

Acoustics (Basel, Switzerland) Pub Date : 2023-05-09 DOI: 10.3390/acoustics5020028

Cristian Albero, Beatriz Sánchez-Tabuenca

引用次数: 0

Acoustic Radiation of a Beam Subjected to Transverse Load 横向荷载作用下梁的声辐射

Acoustics (Basel, Switzerland) Pub Date : 2023-05-05 DOI: 10.3390/acoustics5020027

Ante Skoblar, Goranka Štimac Rončević, D. Lanc, Sanjin Braut

引用次数: 0

An Assessment of Persistent Acoustic Monitoring of a Nuclear Reactor during Full Power Generation 核反应堆满功率运行期间持续声学监测的评估

Acoustics (Basel, Switzerland) Pub Date : 2023-04-28 DOI: 10.3390/acoustics5020025

E. Cárdenas, Samuel K. Takazawa, M. Garcés, D. Chichester, R. Hunley, Chris Young

引用次数: 1

Implication of Altered Acoustic Active Space for Cetacean Species That Result from Soundscape Changes and Noise Additions 声景变化和噪声增加对鲸类动物声活动空间的影响

Acoustics (Basel, Switzerland) Pub Date : 2023-04-28 DOI: 10.3390/acoustics5020026

R. Burnham, D. Duffus

引用次数: 0

Numerical Investigation of Distributed Speed Feedback Control of Turbulent Boundary Layer Excitation Curved Plates Radiation Noise 湍流边界层激励弯曲板辐射噪声的分布式速度反馈控制数值研究

Acoustics (Basel, Switzerland) Pub Date : 2023-04-19 DOI: 10.3390/acoustics5020024

Dapeng Wei, Bilong Liu, Ludi Kang

{"title":"Numerical Investigation of Distributed Speed Feedback Control of Turbulent Boundary Layer Excitation Curved Plates Radiation Noise","authors":"Dapeng Wei, Bilong Liu, Ludi Kang","doi":"10.3390/acoustics5020024","DOIUrl":"https://doi.org/10.3390/acoustics5020024","url":null,"abstract":"The control of decentralized velocity feedback on curved aircraft plates under turbulent boundary layer excitations is numerically investigated in this paper. Sixteen active control units are set on the plate to reduce the vibration and sound radiation of the plate. The computational results from the two methods are compared to verify the accuracy of the numerical model. The plate kinetic energy and the radiated sound power under turbulent boundary layer and control unit excitations are analyzed. The influences of control unit distribution, plate thickness and curvature on radiated sound are discussed. Unlike a flat plate, the control of the lower-order high radiation modes of a curved plate under TBL excitations is critical since these modes predominate the sound radiations. The control of these modes, however, is sensitive to the ratio of the stiffness associated with the membrane tensions to the stiffness associated with the bending forces. This ratio implies that the plate curvature and the thickness play an important role in the control effect. When the plate is thinner and the radius is smaller, the control is less effective.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47730957","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

Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation 利用时域有限差分仿真恢复教堂的低频响应

Acoustics (Basel, Switzerland) Pub Date : 2023-04-12 DOI: 10.3390/acoustics5020023

F. Martellotta, S. Liuzzi, Chiara Rubino

{"title":"Reviving the Low-Frequency Response of a Rupestrian Church by Means of FDTD Simulation","authors":"F. Martellotta, S. Liuzzi, Chiara Rubino","doi":"10.3390/acoustics5020023","DOIUrl":"https://doi.org/10.3390/acoustics5020023","url":null,"abstract":"Rupestrian churches are spaces obtained from excavation of soft rocks that are frequently found in many Mediterranean countries. In the present paper the church dedicated to Saints Andrew and Procopius, located close to the city of Monopoli in Apulia (Italy) is studied. On-site acoustical measures were made, obtaining a detailed description of the acoustics in the current state pointing out, thanks to a combination of analysis techniques, the presence of significant modal behavior in the low frequencies, causing reverberation time to be about 2 s, four times longer than in the other bands, as well as being strongly dependent on source and receiver position (with variations of about 1 s when source is moved outside the chancel). However, as the church is characterized by significant degradation of surfaces and large amounts of debris cover the floor, the original acoustic conditions can be expected to somewhat differ. Acoustical modelling can be very helpful in grasping the original conditions, but given the small dimensions of the space, conventional geometrical acoustic prediction methods cannot be applied to simulate the low-frequency behavior. Thus, the present paper proposes an application of finite-difference-time-domain (FDTD) computation to simulate the low-frequency behavior and analyze a possible reconstruction of the original state. Results showed that a very good agreement was obtained between predictions and measurements, both in terms of resonance frequencies and reverberation times that differed by less than 5%. Modal response strongly affected the acoustical conditions also in the hypothetical reconstruction of the original state, although the sound field proved to be more uniform than in the current state.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42934919","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

A Review of Finite Element Methods for Room Acoustics 室内声学的有限元方法综述

Acoustics (Basel, Switzerland) Pub Date : 2023-04-04 DOI: 10.3390/acoustics5020022

Albert Prinn

{"title":"A Review of Finite Element Methods for Room Acoustics","authors":"Albert Prinn","doi":"10.3390/acoustics5020022","DOIUrl":"https://doi.org/10.3390/acoustics5020022","url":null,"abstract":"Accurate predictions of the wave-dominated region of an acoustic field in a room can be generated using wave-based computational methods. One such method is the finite element method (FEM). With presently available computing power and advanced numerical techniques, it is possible to obtain FEM predictions of sound fields in rooms with complicated geometries and complex boundary conditions in realistic time frames. The FEM has been continuously developed since its inception and attempts to provide solutions in real time using finite element-based methods are beginning to appear in the literature; these developments are especially interesting for auralization and virtual acoustics applications. To support these efforts, and provide a resource for neophytes, the use of the FEM for room acoustics is reviewed in this article. A history is presented alongside examples of the method’s derivation, implementation, and solutions. The current challenges and state-of-the-art are also presented, and it is found that the most recent contributions to the field make use of one or a mixture of the following: the finite element-based discontinuous Galerkin method, extended reaction boundary conditions written in the frequency domain but solved in the time domain, and the solution of large-scale models using parallel processing and graphics processing units.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43236581","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

Diagnosis of Noise Inside Neonatal Incubators under Free-Field Conditions 自由场条件下新生儿保育箱内噪声的诊断

Acoustics (Basel, Switzerland) Pub Date : 2023-03-26 DOI: 10.3390/acoustics5020021

Francisco Fernández-Zacarías, Juan Luis Beira-Jiménez, Virginia Puyana-Romero, Ricardo Hernández-Molina

{"title":"Diagnosis of Noise Inside Neonatal Incubators under Free-Field Conditions","authors":"Francisco Fernández-Zacarías, Juan Luis Beira-Jiménez, Virginia Puyana-Romero, Ricardo Hernández-Molina","doi":"10.3390/acoustics5020021","DOIUrl":"https://doi.org/10.3390/acoustics5020021","url":null,"abstract":"The study aims to diagnose the sound pressure levels inside incubators in a controlled environment under free-field conditions. The tests were carried out in a semi-anechoic room under the standard UNE-EN ISO 3745:2012/A1:2018 in three different operating states: off, on, and on with a temperature alarm triggered. Sound pressure levels were analyzed in three different models of incubators, both inside and outside. The main noise indices analyzed were the corrected equivalent continuous level (LKeq) and the equivalent continuous level (Leq) in third-octave bands. The results obtained under normal operating conditions showed variations among the different incubators, with overall values between 48.8 and 56.3 dBA. The influence of the alarm considerably worsened these data. The values obtained showed that premature newborns are exposed to noise levels above international recommendations. All incubators tested showed the presence of tonal components, both outside and inside the incubator cabin, and, in some cases, low-frequency components, but no impulsivity components were observed in any case.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46418919","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

Visual Speech Recognition for Kannada Language Using VGG16 Convolutional Neural Network 基于VGG16卷积神经网络的卡纳达语视觉语音识别

Acoustics (Basel, Switzerland) Pub Date : 2023-03-16 DOI: 10.3390/acoustics5010020

Shashidhar Rudregowda, Sudarshan Patil Kulkarni, Gururaj H L, Vinayakumar Ravi, M. Krichen

{"title":"Visual Speech Recognition for Kannada Language Using VGG16 Convolutional Neural Network","authors":"Shashidhar Rudregowda, Sudarshan Patil Kulkarni, Gururaj H L, Vinayakumar Ravi, M. Krichen","doi":"10.3390/acoustics5010020","DOIUrl":"https://doi.org/10.3390/acoustics5010020","url":null,"abstract":"Visual speech recognition (VSR) is a method of reading speech by noticing the lip actions of the narrators. Visual speech significantly depends on the visual features derived from the image sequences. Visual speech recognition is a stimulating process that poses various challenging tasks to human machine-based procedures. VSR methods clarify the tasks by using machine learning. Visual speech helps people who are hearing impaired, laryngeal patients, and are in a noisy environment. In this research, authors developed our dataset for the Kannada Language. The dataset contained five words, which are Avanu, Bagge, Bari, Guruthu, Helida, and these words are randomly chosen. The average duration of each video is 1 s to 1.2 s. The machine learning method is used for feature extraction and classification. Here, authors applied VGG16 Convolution Neural Network for our custom dataset, and relu activation function is used to get an accuracy of 91.90% and the recommended system confirms the effectiveness of the system. The proposed output is compared with HCNN, ResNet-LSTM, Bi-LSTM, and GLCM-ANN, and evidenced the effectiveness of the recommended system.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42523493","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

An Iterative Ray Tracing Algorithm to Increase Simulation Speed While Maintaining Overall Precision 一种迭代光线追踪算法，在保持整体精度的同时提高模拟速度

Acoustics (Basel, Switzerland) Pub Date : 2023-03-14 DOI: 10.3390/acoustics5010019

H. Autio, N. Vardaxis, Delphine Bard Hagberg

{"title":"An Iterative Ray Tracing Algorithm to Increase Simulation Speed While Maintaining Overall Precision","authors":"H. Autio, N. Vardaxis, Delphine Bard Hagberg","doi":"10.3390/acoustics5010019","DOIUrl":"https://doi.org/10.3390/acoustics5010019","url":null,"abstract":"Ray tracing is a frequently used method for acoustic simulations, valued for its calculation speed and ease of use. Although it is fast, there are no fully ray tracing-based real-time simulation methods or engines. Under real-time restrictions, ray tracing simulations lose precision and the variance inherent in the random simulation method has too much impact on the outcome. In this paper, an algorithm called iterative ray tracing is presented that reduces the negative effects of real-time restrictions by iteratively improving the initial calculation and increasing the precision over time. In addition, new estimates of the expected value and variance of ray tracing simulations are presented and used to show the iteration steps in the new algorithm reduce variance, while maintaining the expected value. Simulations using iterative ray tracing are compared to measurements and simulations using the classical ray tracing method, and it is shown that iterative ray tracing can be used to improve precision over time. Although more testing is needed, iterative ray tracing can be used to extend most ray tracing algorithms, in order to decrease the adverse effects of real-time restrictions.","PeriodicalId":72045,"journal":{"name":"Acoustics (Basel, Switzerland)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44359272","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