Volume 1: Acoustics, Vibration, and Phononics最新文献_第5页

Research on the Application of Acoustic Emission Technology in the Health Monitoring of the Reducers on Amusement Devices 声发射技术在游乐设备减速器健康监测中的应用研究

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-70743

Junjiao Zhang, G. Shen, Yongna Shen, Yilin Yuan, Wenjun Zhang, Juanjuan Li

引用次数: 0

Model Reduction for Mid-Frequency Transient Vibration Analysis of Beam Structures by the Augmented DTFM 基于增广DTFM的梁结构中频瞬态振动分析模型简化

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-69979

Yichi Zhang, Bingen Yang

{"title":"Model Reduction for Mid-Frequency Transient Vibration Analysis of Beam Structures by the Augmented DTFM","authors":"Yichi Zhang, Bingen Yang","doi":"10.1115/imece2021-69979","DOIUrl":"https://doi.org/10.1115/imece2021-69979","url":null,"abstract":"\u0000 Mid-frequency transient vibration analysis of flexible structures plays an important role in a variety of engineering applications. In a mid-frequency region, neither low-frequency methods like the finite element analysis (FEA) nor high-frequency methods like the statistical energy analysis (SEA) are directly applicable to transient vibration analysis. For optimal design of multi-body structures, a mid-frequency transient vibration analysis tool with a good balance of accuracy and efficiency in computation is in demand. In this paper, to address the aforementioned issue, a model reduction method is developed for mid-frequency transient vibration analysis of beam structures. The method is based on the augmented distributed transfer function method (augmented DTFM).\u0000 In this work, the augmented DTFM is modified for model reduction in mid-frequency analysis of beam structures, which is an extension of the authors’ previous effort. The idea behind this approach is to properly select several modes in the low-frequency region and a number of modes in a mid-frequency region that encompasses the excitation frequency spectrum, from the infinite series given by the augmented DTFM. This way, a reduced model of a beam structure for mid-frequency transient analysis is systematically obtained. The proposed model reduction method is validated in numerical examples, where the augmented method is compared with other methods, including the FEA. The accuracy and efficiency of the new method on the computation of transient displacement and shear force is demonstrated. As shown in the simulation results, a proper balance between accuracy and efficiency in model reduction can be achieved by the augmented DTFM. The computation savings by the proposed method, compared with the traditional numerical methods, can be of several orders of magnitude.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80253179","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

An Ultra-Low-Frequency Active Vertical Vibration Isolator With Horizontal Constraints for Absolute Gravimetry 一种具有水平约束的超低频主动垂直隔振器

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-68008

Jiamin Yao, Weihua Zhuang, Jinyang Feng, Yang Zhao, Shaokai Wang, Shuqing Wu, F. Fang, Tian-chu Li

{"title":"An Ultra-Low-Frequency Active Vertical Vibration Isolator With Horizontal Constraints for Absolute Gravimetry","authors":"Jiamin Yao, Weihua Zhuang, Jinyang Feng, Yang Zhao, Shaokai Wang, Shuqing Wu, F. Fang, Tian-chu Li","doi":"10.1115/imece2021-68008","DOIUrl":"https://doi.org/10.1115/imece2021-68008","url":null,"abstract":"\u0000 Absolute gravimeters have been widely used as an important instrument in geological exploration and geophysics. To achieve a required measurement precision, it is necessary to integrate a vertical vibration isolator with ultra-low resonance frequency into the gravimeter. In this paper, an active vibration isolator designed on the basis of a BM-10 passive vibration isolation platform is presented. In the isolator, a seismometer placed next to the payload on the same plate outputs a voltage signal proportional to the payload’s velocity. According to this signal, a feedback circuit based on a PID controller controls two identical voice coil actuators to drive the platform synchronously. In this way, the vibration of the payload is suppressed. The BM-10 platform has 6-DOF passive vibration isolation originally, but its horizontal vibration isolation is proved unnecessary or even harmful in absolute gravimetry. Hence, two linear bushings are applied as a horizontal constraint to ensure that the payload only moves vertically in a straight line. Experiments show the resonance period of the isolator reaches approximately 88 s. In addition, the active vibration isolator has shown a much better performance for vibrations at low frequency than the passive isolator. In the future, the vibration isolator will be improved and then be integrated in the NIM-AGRb-1 atom-interferometry absolute gravimeter for the evaluation of its performance.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85032916","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

Sound Radiation of Locally Resonant Unidirectionally Ribbed Plates 局部共振单向肋板的声辐射

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-70987

P. Fossat, M. Ichchou

引用次数: 1

Ultrasonic Characterization of Biomimetic Porous Scaffold Using Machine Learning: Application of Biot’s Theory 基于机器学习的仿生多孔支架超声表征:Biot理论的应用

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-72746

M. Hodaei, P. Maghoul

{"title":"Ultrasonic Characterization of Biomimetic Porous Scaffold Using Machine Learning: Application of Biot’s Theory","authors":"M. Hodaei, P. Maghoul","doi":"10.1115/imece2021-72746","DOIUrl":"https://doi.org/10.1115/imece2021-72746","url":null,"abstract":"\u0000 A two-dimensional infinite length porous slab is employed to simulate biomimetic porous scaffold. The pores of slab are saturated with a relatively low and high viscous fluids such as air and bone marrow. Ultrasonic waves based on the Biot-JKD formulation travel through the porous slab and create viscous exchanges between the skeletal frame and the fluid. The Biot-JKD formulation focuses on the parameters, biomarkers of the biomimetic porous scaffold, which are sensitive to the transmission and reflection signals. These parameters include porosity, tortuosity, viscous characteristic length, Young’s modulus, and Poisson’s ratio. An artificial neural network (ANN) based on a set of the biomarkers is rendered to model the transmitted and reflected waves from the porous slab. The validation of the proposed analytical approach and released artificial neural network is evaluated by the pertinent literature. The output of the artificial neural network, the transmitted-reflected waves, is inversely applied to the analytical expression to estimate the biomarkers associated with bone regeneration. The results show that for a medium filled with a relatively high viscous fluid the longitudinal waves are more prone to estimate mechanical properties of the medium such as Young’s modulus and Poisson’s ratio while the transverse waves, in addition to longitudinal waves, are essential to estimate the physical properties of the medium including porosity, tortuosity, and viscous characteristic length. Furthermore, it is also concluded that for the medium filled with a relatively low viscous fluid such as air the longitudinal waves alone is able to estimate the biomarkers, which reduce significantly the computational efforts.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73655208","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

Acoustic Emission-Based Structural Health Monitoring for Future Lunar Pipelines 基于声发射的未来月球管道结构健康监测

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-71429

Mario Escarcega, Meghan Cephus, Skyler Hughes, Nakii Tsosie, Kimberly Kelso, Raechelle Sandoval, A. Ebrahimkhanlou

{"title":"Acoustic Emission-Based Structural Health Monitoring for Future Lunar Pipelines","authors":"Mario Escarcega, Meghan Cephus, Skyler Hughes, Nakii Tsosie, Kimberly Kelso, Raechelle Sandoval, A. Ebrahimkhanlou","doi":"10.1115/imece2021-71429","DOIUrl":"https://doi.org/10.1115/imece2021-71429","url":null,"abstract":"\u0000 This paper explores the use of acoustic-based structural health monitoring (SHM) in lunar habitats to detect damage and failure in pipelines used for resource transportation. Acoustic-based SHM on Earth is a well-studied field of research. Various studies validate the effectiveness of acoustic-based SHM to detect, locate, and characterize damage in pipelines. Relevant literature shows that little to no research has been conducted on SHM regarding simulated lunar pipelines. In this paper, acoustic emission (AE) waveforms were collected and analyzed for aluminum pipe sections that were damaged from three separately simulated lunar conditions. Experiments simulating lunar regolith abrasion, internal galvanic corrosion, and irradiation were conducted on aluminum pipes. Pipes on the lunar surface will be constantly exposed to radiation, abrasion, and corrosion. As such, it is important to detect, localize, and predict damage resulting from these lunar hazards. The waveform data were clustered based on hit-driven properties. These clusters showed distinct differences between the datasets, which allowed for comparison and characterization of the data. It was found that variations in cluster shape and placement in peak, centroid, and average frequency could reliably distinguish between corrosive and abrasive processes. Understanding the differences in the data that contribute to distinctions between event types, and those that do not, will enable AE monitoring systems to better identify, characterize, and predict lunar pipeline failure.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82090139","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

Characterization of Electric Fan Noise Generation Due to Blade Geometry 叶片几何形状对电风扇噪声产生的影响

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-68201

Liliosa-Eyang Cole, F. Barez

{"title":"Characterization of Electric Fan Noise Generation Due to Blade Geometry","authors":"Liliosa-Eyang Cole, F. Barez","doi":"10.1115/imece2021-68201","DOIUrl":"https://doi.org/10.1115/imece2021-68201","url":null,"abstract":"\u0000 The flow surrounding the propeller of an electric fan contributes significantly to the noise emitted by low-pressure electronic fans designed to cool electronic equipment such as desktop computers. This study characterizes fan noise based on modification of geometrical features such as its hub diameter, blade length, blade thickness, blade angle of attack and number of blades.\u0000 Computational Fluid Dynamics and Computational Aeroacoustics simulations were employed to analyze sound pressure level on the fan rotor. A commercially available computer cooling fan was selected as a reference fan. Two constant rotational speeds were tested, 2,400 rpm and 4,500 rpm, yielding OASPL of 31.94 dB and 48.99 dB, respectively. The sound pressure levels visualized from the reference fan were within the range of noise emission advertised by two manufacturers for the same size of fan, with number of blades and rated voltage. Velocity magnitude profiles and pressure profile distributions were also generated to visualize the flow patterns and validate aerodynamic theories citing turbulent flow in the vicinity of the rotor, characterized by a vortex field, wakes and eddies in the Trailing Edge.\u0000 A reduction in hub diameter and an increase in the blade’s thickness resulted in considerable noise reduction. Consequently, an improved fan geometry was created by superimposing these design modifications yielding a 5.02 dB and 3.53 dB noise reduction for the two respective rotational speeds.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77823224","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

Vibro-Acoustic Ultrasonic Resonant Behavior in Skull and Cranial Contents 颅骨及颅内内容物的振动声超声共振行为

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-70038

C. Dumm, Anna C. Hiers, David B. Maupin, Marianne E. Cites, G. Klinzing, Carey D. Balaban, J. Vipperman

{"title":"Vibro-Acoustic Ultrasonic Resonant Behavior in Skull and Cranial Contents","authors":"C. Dumm, Anna C. Hiers, David B. Maupin, Marianne E. Cites, G. Klinzing, Carey D. Balaban, J. Vipperman","doi":"10.1115/imece2021-70038","DOIUrl":"https://doi.org/10.1115/imece2021-70038","url":null,"abstract":"\u0000 High-frequency ensonification of the head has the potential to excite unusual and difficult-to-measure internal vibration behavior. The head is a complex, interconnected vibroacoustic volume filled with and bounded by air, fluids, soft tissue structures, and bone. A literature gap exists in assessment of how ultrasonic vibrations of relatively low frequency and low amplitude might propagate within the skull and cranial contents of humans and cynomolgus macaque monkeys. Ultrasonic emitters are ubiquitous in modern society, including uses in vehicular proximity sensing, room occupancy monitoring, pest control, and industrial cleaning. This investigation uses finite-element techniques to examine vibro-acoustic behaviors of the skull and structures within the cranial cavity in the context of excitation by ultrasonic signals. Previous analysis procedures designed for assessment of possible resonant phenomena in the auditory and vestibular systems are revised and extended to assessment of the skull and the contents of the cranial cavity of humans and macaques, including volumes of cerebrospinal fluid (CSF) and the brain. Results include identification of cranial regions that may experience high-amplitude vibrations in response to ultrasonic excitation. These methods and results are useful for assessing how a wide variety of devices, including communications equipment, might produce biological effects.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82489837","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

IMECE2021 Front Matter IMECE2021前沿问题

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-fm1

引用次数: 0

Topological Optimization of Piezoelectric Materials for the Control of Wave Propagation in Periodic Structures 用于周期性结构中波传播控制的压电材料拓扑优化

Volume 1: Acoustics, Vibration, and Phononics Pub Date : 2021-11-01 DOI: 10.1115/imece2021-70964

Jiahui Shi, Yu Fan, Lin Li

{"title":"Topological Optimization of Piezoelectric Materials for the Control of Wave Propagation in Periodic Structures","authors":"Jiahui Shi, Yu Fan, Lin Li","doi":"10.1115/imece2021-70964","DOIUrl":"https://doi.org/10.1115/imece2021-70964","url":null,"abstract":"\u0000 Piezoelectric materials can be introduced as the additional components into the periodic structures as they can couple the mechanical and electric fields. However, the added mass is always constrained in practical engineering. A method is needed to guide how to posit the piezoelectric materials on the host structure under the mass limit. In this work, we develop a numerical method to determine the best distribution of piezoelectric materials on the host structure in order to control the wave propagation in the periodic structures. This is based on the fact that the propagation properties of the waves in the mechanical field can be regulated by electric impedance shunted to the piezoelectric materials. The coupling strength between the mechanical field and the electric field is quantified by the wave electromechanical coupling factor (WEMCF). It is related to the geometric of the piezoelectric materials only. As the periodic structures are constructed by the identical unit cell, the aim is to design the distribution of the piezoelectric materials on the unit cell. There is no constrain on the shape of piezoelectric materials in the optimized method, only the overall mass is limited. A linear weighing of stress components is proposed as the criterion to determine the priority of locations for piezoelectric materials. In the proposed method, the piezoelectric materials are introduced to the FE model by adding the additional piezoelectric element layers on the host structure. Details for handling polarization direction, electrode connection and the electric circuit parameters selection are also presented. A 1D thin-wall box beam is taken as the application example. Results show that the Bragg band gap can be adjusted to cover the target frequency range under the optimization design with the 10% mass limitation.","PeriodicalId":23648,"journal":{"name":"Volume 1: Acoustics, Vibration, and Phononics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76651146","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