NOISE-CON ... proceedings最新文献_第4页

Methods of vibration field control using actuator array for improving the panel speaker sound 采用致动器阵列控制振动场以改善面板扬声器声音的方法

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0113

Jeong-Guon Ih

{"title":"Methods of vibration field control using actuator array for improving the panel speaker sound","authors":"Jeong-Guon Ih","doi":"10.3397/no_2023_0113","DOIUrl":"https://doi.org/10.3397/no_2023_0113","url":null,"abstract":"The panel speaker occupies a small volume, so it has significant merit potential in application to modern machines and devices in the age of Internet-of-Things. However, the severe fluctuation in the radiated sound spectrum due to the multi-modal vibration behaviour of finite panels has been an inherent problem. The application of damping can reduce the resonance effect, but the frequency range is limited to a narrow band. Actively, the actuator array can control the vibration field of the plate. The vibration rendering for the desired vibration pattern or the elimination of some modes is possible by controlling the modal contribution or the boundary impedance in the frequency range of interest. An inverse formulation, which is analogous to the acoustic field rendering problems, should be solved to determine the actuators' control gain for achieving the desired response. In this presentation, several methods for active array control of the vibration field for panel speakers are compared: vibration field rendering using the modal approach, direct inverse technique fulfilling the desired sound radiation, boundary impedance control using traveling wave, and sparse actuator array allocation method. Their merits and demerits are discussed regarding the future potential in various applications.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"34 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":"135726954","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

Effect of room acoustics on speech intelligibility under noise between native and non-native listeners 室内声学对母语和非母语听者在噪声条件下语音清晰度的影响

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0108

Justine Hui

引用次数: 0

The natural frequency estimation for a system composed of a beam and a spring-mass system 由梁和弹簧质量系统组成的系统的固有频率估计

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0085

Xutao Sun

{"title":"The natural frequency estimation for a system composed of a beam and a spring-mass system","authors":"Xutao Sun","doi":"10.3397/no_2023_0085","DOIUrl":"https://doi.org/10.3397/no_2023_0085","url":null,"abstract":"This study presents an approximate method for determining the natural frequency of a system composed of a beam and a two-degree-of-freedom spring-mass system. The expression for estimating the natural frequency is derived following the standard procedures of the forced vibration analysis of a beam. The results obtained using the current method are in good agreement with those obtained through the dynamic stiffness method, especially when the spring stiffness is large. The innovativeness of the current method is that it reveals the relevance between the natural frequency of the system, the natural frequency of the beam, and the mode shape data at the positions where the spring-mass system is attached to the beam. The method is potentially useful in the dynamic wheel-track interaction analysis because the train wheel is normally simplified as a spring-mass system with high spring stiffness. It may also be applied to natural frequency-based damage detection where an auxiliary spring-mass system is used. When the spring-mass system roves on the beam, the curve of natural frequency versus spring-mass system location would be relevant to the mode shape square which is sensitive to local damage.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"31 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":"135728291","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

Computing dispersion relations with modal analysis methods 用模态分析方法计算色散关系

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0021

Luiz Henrique Marra Da Silva Ribeiro

{"title":"Computing dispersion relations with modal analysis methods","authors":"Luiz Henrique Marra Da Silva Ribeiro","doi":"10.3397/no_2023_0021","DOIUrl":"https://doi.org/10.3397/no_2023_0021","url":null,"abstract":"Dispersion diagrams depicting dispersion relations are usually computed from a periodic structure single unit cell using either analytical methods, such as the plane wave expansion (PWE) method, or numerical methods, such as the wave finite element (WFE) method, by applying Bloch-Floquet periodic boundary conditions. However, the latter is still not available in most commercial FE codes. In this work, we propose a method to compute the dispersion diagram using standard modal analysis tools available in FE commercial codes currently used for structural analysis. We show that if a metastructure consisting of a few cells is \"periodized\" by \"wrapping around\" the degrees of freedom at its ends, its natural frequencies will be points on the dispersion curve pass bands. The wavenumbers corresponding to these natural frequencies can be obtained from the corresponding vibration modes using Prony's method. These natural frequencies are real for Hermitian structures and complex for non-Hermitian structures. Besides providing a useful tool for wave dispersion analysis using standard FE codes, the proposed method provides interesting insights into the dynamics of periodic structures. The proposed method is applied to simple passive and active periodic rod structures.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"33 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725638","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 deterministic energy method for predicting the response of coupled finite structures 预测耦合有限结构响应的确定性能量法

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0015

Yi Yang

引用次数: 0

Assessment of acoustical materials sound absorption coefficient under oblique incidence plane wave and diffuse field using a virtual source antenna 利用虚拟源天线评估斜入射平面波和漫射场下声学材料的吸声系数

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0014

Alain Berry

引用次数: 0

Contribution of Lighthill tensor components to far-field acoustic pressure 光丘张量分量对远场声压的贡献

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0115

Esmaeel Eftekharian