Noise Control and Acoustics最新文献_第9页

Vibration and Acoustic Evaluation of a Large Centrifugal Wastewater Pump, Part 2: Modeling and Interpretation 大型离心污水泵的振动和声学评价，第2部分:建模和解释

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1611

P. Abbot, C. Gedney, D. Morton, S. Celuzza, I. Dyer, Peter Ehlers, R. Vaicaitis, James Brown, A. Guinzburg, W. Hodgson

引用次数: 0

Regularization Techniques Applied to Nearfield Acoustical Holography 正则化技术在近场声学全息中的应用

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1621

E. Williams

引用次数: 1

Feature Variation and Its Impact on Structural Acoustic Response Predictions 特征变化及其对结构声响应预测的影响

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/1.1523072

K. Cunefare

{"title":"Feature Variation and Its Impact on Structural Acoustic Response Predictions","authors":"K. Cunefare","doi":"10.1115/1.1523072","DOIUrl":"https://doi.org/10.1115/1.1523072","url":null,"abstract":"\u0000 This paper presents a screening technique to assess the impact on model fidelity introduced by variations in the properties or positions of features in harmonically forced fluid-loaded structural acoustic models. While fluid-loading is included, it is not a requirement or restriction to the methods presented. The perspective taken is one of knowledge of a reference state, with a desire to determine the impact on the total radiated acoustic power due to perturbations in the reference state. Such perturbations change the predicted resonance frequencies of a structure under consideration, and hence, change the predicted response amplitudes. The method uses a single degree of freedom response model in the local region of each fluid-loaded resonance, coupled with eigenvalue sensitivities or variations, to estimate the perturbation impact. The SDOF model argues for the use of proportional bandwidth analyses. Elements of the analysis method are not necessarily restricted to model perturbations nor acoustic power, rather they may be used to assess the perturbation of any quadratic response quantity of interest due to changes in resonance frequency. The SDOF analysis method is limited by its assumption of constant modal forcing between the reference and perturbed states.","PeriodicalId":387882,"journal":{"name":"Noise Control and Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116131371","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

Damage Modeling in Honeycomb Panels for Tap Testing 用于抽头试验的蜂窝板损伤建模

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1627

V. Dayal, Gohar M. Mir, D. Hsu

{"title":"Damage Modeling in Honeycomb Panels for Tap Testing","authors":"V. Dayal, Gohar M. Mir, D. Hsu","doi":"10.1115/imece2000-1627","DOIUrl":"https://doi.org/10.1115/imece2000-1627","url":null,"abstract":"\u0000 Effect of damage on Composite Honeycomb panel due to low speed impact is of significance. The result of such impact is damage such as crushing or buckling of the core, core to face de-bonding and local de-lamination of the plies. The damage, however, may be invisible to human eye but can result in significant degradation of stiffness and strength of Honeycomb structure. Of all the NDE techniques available, Tap Test seems to be the cheapest and most suited for the detection of damage in face-sheets, the face-sheet to core de bonding, and core damage. Instrumented Tap Testing with scanning capability makes it a very attractive NDE tool. This work is concerned with modeling the Tap Test on composite honeycomb panels by Finite Elements in both static and dynamic modes.\u0000 Interactive Finite Element model has been developed having option of creating multiple defects of varying size at desired location within the core material. Model is generated using Graphite/Epoxy quasi-isotropic laminate as face sheet material with Nomex paper core, simulating condition of crushed core. The model was analyzed by applying point load (equivalent force of the impacting projectile) at the node of concern. The defect is modeled as a gap in the core.\u0000 Samples were made having defects at different core height and were analyzed using Finite Element Methods (ANSYS) and by Tap Testing under same boundary conditions and loading. The sensitivity of FE model and Tap Test to damage location and size has been studied and the results are presented.","PeriodicalId":387882,"journal":{"name":"Noise Control and Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124201446","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

The Features of Flow in a Parallel-Walled Radial Vaneless Diffuser 平行壁径向无叶扩压器的流动特性

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1613

K. B. Abidogun, S. Ahmed

{"title":"The Features of Flow in a Parallel-Walled Radial Vaneless Diffuser","authors":"K. B. Abidogun, S. Ahmed","doi":"10.1115/imece2000-1613","DOIUrl":"https://doi.org/10.1115/imece2000-1613","url":null,"abstract":"\u0000 Detailed experimental investigation of flow features in a parallel-walled radial vaneless diffuser of a centrifugal blower was carried out. Maximum flow rate through the blower, at a constant impeller speed of 1500 rpm, was maintained throughout the experiment to ensure that no self-exited flow oscillation occurs in the diffuser. The symmetrical flowfield in the diffuser was measured along a radial path using an X-wire probe. The radial and tangential velocity distributions and their statistics, as well as flow angle distribution, are reported. The results presented in this paper agree well with earlier work on this subject. For instance, the flow angle at half the diffuser width, which is the position at which critical flow angle (measured from the radial direction) have been generally reported to be about 78°, did not exceed 65° from the diffuser inlet to its outlet along the measurement path. The result also showed that the flow exiting the impeller is skewed as revealed by the triple velocity product correlations. This data is a useful tool for vaneless diffuser calculation model developers as there are very limited data that paralleled the current one as expounded in the text of this paper.","PeriodicalId":387882,"journal":{"name":"Noise Control and Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132493726","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

Computational Methods for the Detection of the Source of Acoustical Noise 声学噪声源检测的计算方法

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1623

T. DeLillo, V. Isakov, N. Valdivia, Lianju Wang

引用次数: 1

Modeling the Space-Time Correlations in the Wake Region of a Turbulent Boundary Layer 湍流边界层尾迹区时空相关性的模拟

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1609

J. Gavin, G. Lauchle

引用次数: 0

Response to an Induced Flow/Pressure Transient During Well Fracturing 压裂过程中诱导流量/压力瞬变的响应

Noise Control and Acoustics Pub Date : 2000-11-05 DOI: 10.1115/imece2000-1614

J. Loth, E. Echavarria, S. Stephenson

引用次数: 0

Sound Radiation From a Flow-Excited Rectangular Plate With Visco-Elastic Supports 流激粘弹性支承矩形板的声辐射

Noise Control and Acoustics Pub Date : 2000-09-01 DOI: 10.1115/imece2001/nca-23508

Junhong Park, L. Mongeau

{"title":"Sound Radiation From a Flow-Excited Rectangular Plate With Visco-Elastic Supports","authors":"Junhong Park, L. Mongeau","doi":"10.1115/imece2001/nca-23508","DOIUrl":"https://doi.org/10.1115/imece2001/nca-23508","url":null,"abstract":"\u0000 In road vehicles, one dominant “wind noise” generating mechanism is the flow-induced vibration of side-glass windows. Side-glass windows are excited by unsteady surface pressures associated with turbulent flows over the vehicle body. In this study, experiments were performed in order to investigate the sound radiated by a seal-supported, rectangular aluminum panel excited by separated/reattached flow. The primary goal of this investigation was to assess the influence of seal mechanical properties and geometries on the sound transmission loss of the side-glass window. Experimental modal analysis test was conducted to accurately measure the resonance frequencies and the modal damping ratios of the panel. Surface pressure measurements were performed using small-diameter condenser microphones. The influence of the excitation spectrum on the radiated noise level was determined. The results were compared with theoretical predictions obtained using an analytical model based on a variational formulation of the problem. The flow-excited vibration response was predicted accurately for two different turbulent flows. The vibration energy dissipation at the sealing system reduced the amplitude of the plate vibration at resonance and the radiated sound.","PeriodicalId":387882,"journal":{"name":"Noise Control and Acoustics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134289368","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

Effects of Low Frequency Induced Excitations on Fluttering Panels in Supersonic Flow 超声速流动中低频诱导激励对颤振板的影响

Noise Control and Acoustics Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0223

G. Surace, R. Udrescu

引用次数: 0