NOISE-CON ... proceedings最新文献_第3页

Application of the equivalent source method to preserve and reproduce the spatial characteristics of the sound source 应用等效声源法保存和再现声源的空间特征

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0110

Wan-Ho Cho

引用次数: 0

Structural system modeling from base excitation measurements using Swarm Intelligence 基于群体智能的基础激励测量的结构系统建模

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0017

Corinna Cerini

引用次数: 0

Analysis of thermoacoustic phenomenon using concentrated mass model 用集中质量模型分析热声现象

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0073

Daiki Funyu

{"title":"Analysis of thermoacoustic phenomenon using concentrated mass model","authors":"Daiki Funyu","doi":"10.3397/no_2023_0073","DOIUrl":"https://doi.org/10.3397/no_2023_0073","url":null,"abstract":"In general acoustic analysis, temperature of the air is often assumed to be constant. However, in some cases, the relationship between sound waves and temperature cannot be ignored. For example, a temperature gradient in an acoustic tube can generate self-excited vibrations of the air. A temperature gradient can also be generated by the input of sound waves. Engines and refrigerators that apply these phenomena can use exhaust heat as a drive source, so that they are expected as thermoacoustic devices with little adverse effect on the environment. Thermoacoustic devices have been actively studied in recent years, and efficient analytical methods including non-linearity of sound waves are still required. In this study, we propose an analysis method of thermoacoustic phenomena using a concentrated mass model. This model consisted of masses, springs, and dampers, and efficiently analyses thermoacoustic phenomena as a vibration system. In addition, this model is suitable for non-linear analysis and coupled analysis with other vibrating bodies. In this paper, we formulated an acoustic tube with a temperature gradient using the proposed model and verified the validity of the model by numerical calculations.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725649","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

Numerical Simulation of Aeroacoustics Generated by Flow around 30P30N High-lift Aerofoil using Hybrid CFD/BEM approach 基于混合CFD/BEM方法的30P30N大升力机翼绕流气动声学数值模拟

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0083

Masaaki Mori

{"title":"Numerical Simulation of Aeroacoustics Generated by Flow around 30P30N High-lift Aerofoil using Hybrid CFD/BEM approach","authors":"Masaaki Mori","doi":"10.3397/no_2023_0083","DOIUrl":"https://doi.org/10.3397/no_2023_0083","url":null,"abstract":"In this study, we have performed the acoustic simulation generated by the flow around the 30P30N airfoil with a slat and a flap by means of Boundary element Method using quadrupole sources extracted from the unsteady CFD simulations. The CFD simulations are performed using Ansys Fluent with LES Dynamic Model, and compressible flow fields have been solved. The attack angles of the airfoil are 5.5 and 9.5 degree. When the BEM calculation for the acoustic propagation was performed, the FMM (Fast Multipole Method) and FMBEM were used to calculate quickly the contributions from the quadrupole sources and acoustic propagation, reflection and diffraction on the boundaries, those are the walls of the 30P30N airfoil. The results of the acoustic simulations show a relatively good agreement with the experimental data and other researchers' simulation results. The directivities of the acoustic pressure for the primary peak frequency are shown and they depend on the attack angle of the airfoil. The far-field SPL also depends on the attack angle of the airfoil and decreases as the attack angle increases. We have also investigated the quadrupole sources in frequency domain, and the results showed that the quadrupole sources at far-field SPL peak frequencies near the wake of slat and the suction side of the main element of the airfoil are stronger than those in other regions.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"35 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725925","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

Laboratory implementation of the noise correlation methodology for leak location in water distribution systems 配水系统泄漏定位的噪音相关方法的实验室实施

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0039

Patrizio Fausti

{"title":"Laboratory implementation of the noise correlation methodology for leak location in water distribution systems","authors":"Patrizio Fausti","doi":"10.3397/no_2023_0039","DOIUrl":"https://doi.org/10.3397/no_2023_0039","url":null,"abstract":"Nowadays, reducing the loss of water resources is of primary concern in many countries worldwide. Different methodologies exist for the identification and localisation of leaks in water distribution networks, which can be applied simultaneously at a different scale, to improve success rate. Acoustic correlation has been employed for many years to localise such leakages, based on the post-processing of vibroacoustic signals acquired by two sensors placed on both sides of the pipe where the leakage is supposed to be located. The practical application of this methodology still presents some significant issues. The implementation of the noise correlation methodology was investigated through an experimental test rig by simulating leakages in different conditions of pressure and flow and investigating the effects of background noise. Hydrophonic measurements and recordings were performed, identifying the frequency range affected by the leak noise, and the signal to assess the accuracy of the noise correlation method. A pre-filtering of the signals to reduce the effect of background noise masking was also investigated. The accuracy of acoustic correlation in localising the leakage was assessed by computing the propagation velocity, which depends on the vibroacoustic fluid-structure interaction, through approximated analytical equations","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"34 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135726951","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

Modeling and analysis of rotating shaft with bearing faults based on transfer matrix method 基于传递矩阵法的轴承故障转轴建模与分析

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0044

Dongwoo Hong

引用次数: 0

An investigation of magnetic and vibroacoustic coupling in the balanced armature receiver 平衡式电枢接收机磁声耦合研究

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0027

Birgitte Baekke

引用次数: 0

Identification of broadband acoustical sources in the cylindric duct using a hybrid reconstruction method 用混合重建方法识别圆柱形管道中的宽带声源

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0013

Kang Gao

{"title":"Identification of broadband acoustical sources in the cylindric duct using a hybrid reconstruction method","authors":"Kang Gao","doi":"10.3397/no_2023_0013","DOIUrl":"https://doi.org/10.3397/no_2023_0013","url":null,"abstract":"Beamforming and inverse methods are widely applied to the localization and reconstruction of acoustical sources inside ducts. Identification of in-duct sources using the conventional beamforming method would lead to poor spatial resolution and even fail at some specific frequencies with multiple virtual sources. Employing the inverse method would improve the accuracy of inner duct source localization, however, severe deviation of source intensity results calculated by the inverse method from actual results would occur due to tremendous dimensions of inversion and regulation process of the transfer function matrix. To reduce the dimensions of inversion and further improve the accuracy of source identification, a combined imaging methodology is proposed. The beamforming method is firstly applied to locate regions containing sound sources preliminarily, then an inverse method is applied to regions contributed by beamforming to remove ghosts and side lobes. Numerical simulations are implemented to validate the method. Azimuthal and radial localization results indicate that the combined imaging method is with better spatial resolution than beamforming or inverse methods. Reconstructed results of the source's volumetric velocity demonstrate that the proposed method has a lower deviation of source intensity than the inverse method.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"36 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725914","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

Linear vs nonlinear structural vibration behavior of steel-timber composite building elements 钢木组合建筑单元的线性与非线性结构振动特性

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0043

Bettina Chocholaty

引用次数: 0

Minimization of acoustic power in free space using dipole sound sources 利用偶极声源使自由空间中的声功率最小化

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0052

YUTA OGASAWARA

引用次数: 0