NOISE-CON ... proceedings最新文献_第6页

Sound radiation from a coated cylindrical shell in turbulent cross flow 湍流横流中涂覆圆柱壳的声辐射

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0104

Gyani Shankar Sharma

引用次数: 0

A simple transformation for switching between the stochastic responses in different systems 在不同系统的随机响应之间切换的简单变换

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0045

Sergio De Rosa

引用次数: 0

Validation of a hybrid deterministic-diffuse approach for prediction of diffuse vibration transmission across finite plate junctions 有限板节点上扩散振动传播预测的混合确定性-扩散方法的验证

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0018

Wannes Stalmans

{"title":"Validation of a hybrid deterministic-diffuse approach for prediction of diffuse vibration transmission across finite plate junctions","authors":"Wannes Stalmans","doi":"10.3397/no_2023_0018","DOIUrl":"https://doi.org/10.3397/no_2023_0018","url":null,"abstract":"Accurate numerical prediction of vibration transmission across junctions is important since this flanking vibration transmission can have a substantial influence on the sound insulation of a system. An important parameter for quantifying vibration transmission across junctions is the coupling loss factor commonly used in Statistical Energy Analysis (SEA). A hybrid deterministicdiffuse approach is adopted here to calculate coupling loss factors across finite junctions. With this approach some parts of the structure are modelled as diffuse subsystems, for example the plates connected to the junction, while other parts, for example a connecting element, can be modelled as a deterministic subsystem. In this way the finite size and structural details of the junction are considered. The hybrid deterministic-diffuse approach is compared to Monte-Carlo simulations of a detailed finite element model where masses are randomly distributed over the plates connected to the junction and the ensemble average coupling loss factor is computed. In this validation, both direct coupling between plates and coupling through intermediate elements are considered. The coupling loss factors from both methods agree well at higher frequencies, where the diffuse field assumption is valid and no strong coupling between the out-of-plane subsystems is present.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"32 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135728282","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 fast multipole boundary element method for acoustics in viscothermal fluids 粘热流体声学的快速多极边界元法

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0071

Simone Preuss

{"title":"A fast multipole boundary element method for acoustics in viscothermal fluids","authors":"Simone Preuss","doi":"10.3397/no_2023_0071","DOIUrl":"https://doi.org/10.3397/no_2023_0071","url":null,"abstract":"Standard numerical models in acoustics rely on the isentropic Helmholtz equation. Its derivation assumes adiabatic and reversible, i.e., dissipation-free, wave propagation. Sound waves in fluids are, however, subject to viscous and thermal losses. These losses originate from viscous friction and heat conduction, leading to the formation of acoustic boundary layers. Considering these effects becomes significant in setups with acoustic cavities of similar dimension as the boundary layers. Recently, boundary element methods (BEM) accounting for the viscothermal dissipation have been proposed. These methods limit the discretization to the surface of the fluid domain and require significantly fewer degrees of freedom than comparable finite element models. However, the BEM coefficient matrices are fully populated, resulting in high computational costs and storage requirements. This study develops a new BEM formulation for acoustics in viscothermal fluids that uses the fast multipole method - a low-rank approximation technique based on a hierarchical subdivision of the computational domain - to alleviate this shortcoming. It is shown that the fast viscothermal BEM improves the algorithmic complexity over the conventional formulation, reducing both the memory requirements and solution time. The results indicate good scalability of the method making it feasible for larger applications such as acoustic metamaterials.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"33 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":"135725647","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

Systematic design of 2D and 3D vibroacoustic fluidic cavity sensors using topology optimization 基于拓扑优化的二维和三维振动声流腔传感器系统设计

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0029

Yauheni Belahurau

{"title":"Systematic design of 2D and 3D vibroacoustic fluidic cavity sensors using topology optimization","authors":"Yauheni Belahurau","doi":"10.3397/no_2023_0029","DOIUrl":"https://doi.org/10.3397/no_2023_0029","url":null,"abstract":"In this research we investigate a novel sensor concept, which utilizes a standing acoustic wave inside a liquid-filled cavity to probe volumetric properties of a fluid analyte. However, realizing a high-Q cavity resonator is a challenge because of low acoustic impedance contrast between liquids and solids. In our previous studies, we surround the cavity resonator with phononic crystal layers that provide a strong cavity resonance within the phononic band gap. The quality factor drastically depends on the geometry of the metamaterial lattice. Therefore, the main aim of this study is to find an optimal material layout of the solid domain around the cavity by employing topology optimization. We formulate the optimization problem as maximization of the Q-factor of the cavity resonance. We consider the sensor as a fully coupled vibroacoustic system, taking into account material losses and frequency-dependent material properties. Since resonance problems are very sensitive to minor variations in geometry, we apply a gray scale suppression constraint to minimize the influence of geometrical uncertainties and make the optimized designs suitable for additive manufacturing","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"34 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135726955","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

Comparing acoustic prediction methods for additively manufactured porous structures 增材制造多孔结构声学预测方法的比较

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0100

William Johnston

引用次数: 0

The Modeling of Disc-shaped Acoustic Black Hole Plate and Vibration Characteristics 圆盘状声波黑洞板的建模及振动特性研究

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0026

Yuan Ding

{"title":"The Modeling of Disc-shaped Acoustic Black Hole Plate and Vibration Characteristics","authors":"Yuan Ding","doi":"10.3397/no_2023_0026","DOIUrl":"https://doi.org/10.3397/no_2023_0026","url":null,"abstract":"The Acoustic Black Hole (ABH) structure has great potential in vibration and noise control due to the characteristics of high damping and energy accumulation. A dish-shaped two-dimensional acoustic black hole plate is proposed in order to reduce the possibility of the structural damage happened in conventional embedded ABH in the centre of the plate. The dish-shaped acoustic black hole plate only cuts ABH on the edge. The finite element method is often used to establish the model of acoustic black hole plates. However, it is high cost and low efficiency in computation. A semi-analytical theoretical model of the disc-shaped acoustic black hole plate based on Gaussian expansion method is established in order to improve computation efficiency. Meanwhile, the shape function filtering method is proposed to solve the problem of non-convergence when Gaussian expansion method is used to model a non-rectangular plate. A finite element model of the disc-shaped acoustic black hole plate is established and used to verify the accuracy of the proposed semi-analytical theoretical model. The results show that the dish-shaped acoustic black hole plate has excellent energy accumulation effect and can be used further as Dynamic Vibration Absorber (DVA) to reduce the vibration of host structure.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"35 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":"135726943","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

Road Pattern Classification Using Deep Learning for Noise Data for Autonomous Driving Vehicle 基于深度学习的自动驾驶车辆噪声数据道路模式分类

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0008

Sang Kwon Lee

引用次数: 0

Dispersion relation and sound transmission loss of a Mindlin plate with an array of attached masses 附带质量阵列的明林板的频散关系及声传输损失

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0096

Vladislav Sorokin

{"title":"Dispersion relation and sound transmission loss of a Mindlin plate with an array of attached masses","authors":"Vladislav Sorokin","doi":"10.3397/no_2023_0096","DOIUrl":"https://doi.org/10.3397/no_2023_0096","url":null,"abstract":"The paper concerns increasing the sound transmission loss of wall partitions in the coincidence region by the addition of an array of point masses. Both theoretical and experimental analysis of sound and vibration attenuation in a Mindlin plate with masses attached in a periodic \"supercell\" pattern are performed. Distances between the neighbouring masses within the supercell are not restricted to be equal, and masses themselves can be non-identical. By modelling the masses as point attachments, analytical expressions are developed for predicting the dispersion relation and frequency bandgaps of the plate. It is shown that wave propagation in two primary (orthogonal) directions in the plate and the corresponding frequency bandgaps have the most pronounced effect on the sound transmission loss. Variation of the distances between the masses, or masses themselves, can lead to additional lower-frequency bandgaps. The effects of the frequency bandgaps on the sound transmission through the plate are validated by numerical analysis conducted using the wave and finite element method. Experimental testing in a transmission suite under diffuse field conditions of large-scale (2.4m by 1m) plates with periodically attached masses is conducted, showing benefits of utilizing multiple scattering to increase the sound transmission loss in the targeted region.","PeriodicalId":471330,"journal":{"name":"NOISE-CON ... proceedings","volume":"32 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725655","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

Parametric study of the axial force and negative stiffness of an electromagnetic mechanism for vibration isolation applications 电磁隔振机构轴向力和负刚度的参数化研究

NOISE-CON ... proceedings Pub Date : 2023-11-05 DOI: 10.3397/no_2023_0056

Mehran Shahraeeni

引用次数: 0