The International Journal of Acoustics and Vibration最新文献_第4页

Tooth Base Geometrical Variability Effect on the Vibration Behavior of the Stator 齿基几何变异性对定子振动特性的影响

The International Journal of Acoustics and Vibration Pub Date : 2023-06-16 DOI: 10.20855/ijav.2023.28.21927

J. Hallal, M. Hammoud, F. Druesne, Hussein Issa, V. Lanfranchi, Jean-Daniel Chazot

{"title":"Tooth Base Geometrical Variability Effect on the Vibration Behavior of the Stator","authors":"J. Hallal, M. Hammoud, F. Druesne, Hussein Issa, V. Lanfranchi, Jean-Daniel Chazot","doi":"10.20855/ijav.2023.28.21927","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.21927","url":null,"abstract":"The magnetic pressure generated in the stator of electric machines can be a significant source of noise and vibration. The vibration behavior of the stator and such mechanical structures primarily depends on their geometry. Although the stator is often considered a simple structure, its teeth are not included in this assumption. In this paper, we endeavor to evaluate the impact of stator geometrical variability on the vibration behavior of electric machines. Our sensitivity study reveals that natural frequencies and frequency response functions are highly sensitive to geometrical variability. To account for this, we conducted a variability propagation study using a stochastic finite element model. Our findings show negligible variability on the natural frequencies but a high variability on the frequency response functions, even with low input variability. As anticipated, our study highlights the critical role of accounting for geometrical variability to enhance the accuracy of finite element models and strengthen their predictive power. However, the main contribution of this work is that the vibration behavior of the stator is not coupled, implying that the impact on natural frequencies does not necessarily reflect the same effect on the frequency response function.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125898174","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

Feasibility of Using a Mobile Device to Identify the Axle Whine Noise in a Vehicle 利用移动装置识别车辆轴啸噪声的可行性

The International Journal of Acoustics and Vibration Pub Date : 2023-06-16 DOI: 10.20855/ijav.2023.28.21855

Guner Berker Rahtuvan, Akif Yavuz, O. Sen

{"title":"Feasibility of Using a Mobile Device to Identify the Axle Whine Noise in a Vehicle","authors":"Guner Berker Rahtuvan, Akif Yavuz, O. Sen","doi":"10.20855/ijav.2023.28.21855","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.21855","url":null,"abstract":"This article investigates the feasibility of using the built-in microphones of mobile devices to diagnose axle whine noise in a vehicle. Three sound pressure measuring sensors or devices are selected. The first one is a high-end condenser microphone, which is calibrated during the measurements; this data is taken as a reference for the other devices. Then two different types of mobile devices are selected and relative calibrations are carried out. Measurements are first performed inside a hemi-anechoic room; artificially generated sinusoidal and random sound signals are played through a calibrated sound source and data is acquired with all devices. This setup is placed inside a vehicle cabin (for a non-running engine) and measurements are repeated. The onboard entertainment system of the vehicle is used as well in addition to the calibrated sound source. Measurements reveal that one of the mobile devices has superior performance when compared to the other one though calibration improves the performance of the latter. Finally, measurements are performed inside the vehicle cabin while the vehicle is being driven along a certain path to assess the diagnostic performance. The axle whine noise problem in two vehicles is successfully detected by employing an empirical mode decomposition process.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"353 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116555653","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

Research on Transformer Voiceprint Feature Extraction Oriented to Complex Noise Environment 面向复杂噪声环境的变压器声纹特征提取研究

The International Journal of Acoustics and Vibration Pub Date : 2023-06-16 DOI: 10.20855/ijav.2023.28.21933

Shen Xiang, Xu Fei, Xu Long, Cai Jidong

{"title":"Research on Transformer Voiceprint Feature Extraction Oriented to Complex Noise Environment","authors":"Shen Xiang, Xu Fei, Xu Long, Cai Jidong","doi":"10.20855/ijav.2023.28.21933","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.21933","url":null,"abstract":"Transformer fault diagnosis based on acoustic characteristics is a new non-contact and non-destructive monitoring method. It has the advantages that the acoustic signal detection is not disturbed by electric and magnetic fields, and the monitoring process does not affect the normal operation of the transformer. Aiming at the difficulty of extracting transformer voiceprint features in complex noise environment, a transformer voiceprint feature extraction method based on Variable Mode Extraction (VME) is proposed. In this method, the center frequency of the Intrinsic Mode Function(IMF) is set according to the generation mechanism of transformer radiated noise, thus the uncertainty of decomposition results caused by random distribution and other frequency search methods is eliminated; Then, taking the frequency-domain energy aggregation of IMF and the minimum center frequency energy of residual signal as the optimization objectives, the cyclic iterative decomposition is used to identify and extract the transformer voiceprint features, so as to reduce the impact of environmental noise and other equipment noise. The analysis results of simulation signals and field signals show that this method can effectively reduce the impact of environmental noise and extract more clear and accurate transformer voiceprint features.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"8 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120925682","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

Natural Frequencies of a Viscoelastic Supported Axially Functionally Graded Bar With Tip Masses 具有尖端质量的粘弹性支承轴向功能梯度杆的固有频率

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11907

Cihan Demir

{"title":"Natural Frequencies of a Viscoelastic Supported Axially Functionally Graded Bar With Tip Masses","authors":"Cihan Demir","doi":"10.20855/ijav.2023.28.11907","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11907","url":null,"abstract":"The frequency parameters of an Axially Functionally Graded (AFG) bar for viscoelastic and point mass boundary conditions are studied in this paper. The structures with functionally graded materials under axial loads can be modelled as AFG bars. Those may be considered as support elements with spring and dashpot in the vibration isolation. Keeping the ratio of force frequency and natural frequency at a certain level is ensured to control the natural frequency therefore dynamic amplification factor with different material combinations. Various boundary conditions are attained by changing the spring and damping coefficients of viscoelastic support elements and the ratio of rod mass to tip mass. Researchers assume that the beam material properties in directions of length and thickness change exponentially, individually, or both in their studies. There are a few studies on the AFG rods in the existing studies. Analysis is carried out via the finite element method for the non-dimensional frequency parameters of the bar in MATLAB. The energy equations of the motion are obtained in the frame of axial bar theory considering the material properties of the bar vary longitudinally according to the power-law distribution. The effects of material distribution, spring, damping and tip mass values on the bar's frequency parameters and structural behaviour have been extensively investigated.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125157291","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

How Contemporary Artificial Intelligence Became a Hot Topic in Acoustics and Vibration 当代人工智能如何成为声学与振动领域的热门话题

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.1e107

J. Arenas

引用次数: 0

A Comparison of the Performance of Four Acoustic Modulation Techniques for Robot Communication in Pipes 机器人管道通信中四种声调制技术的性能比较

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11930

Zhengwei Li, Yicheng Yu, K. Horoshenkov

{"title":"A Comparison of the Performance of Four Acoustic Modulation Techniques for Robot Communication in Pipes","authors":"Zhengwei Li, Yicheng Yu, K. Horoshenkov","doi":"10.20855/ijav.2023.28.11930","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11930","url":null,"abstract":"Autonomous robotics is an emerging technology for the inspection of a vast network of underground pipes. Communication between autonomous robots is essential to optimise their efficiency and network coverage. However, sending a message acoustically is not a well-researched topic because most of the existing literature is devoted to the study of the acoustic properties of the pipe for the purpose of sensing rather than communication. In particular, the influence of multi-modal propagation and background noise on the quality of acoustic communication in pipes has not been well understood. This paper studies the performance of four standard acoustic communication techniques in a dry drainage pipe to fill this knowledge gap. The noise resistance, communication range and data rate of these techniques are estimated through numerical simulations and laboratory experiments. It has been found that the techniques based on shift keying requires at least 5--10 dB signal to noise ratio (SNR) to function properly while the chirp linear frequency modulation technique can operate reliably with SNR = 0 dB or event lower SNR. The results also suggest that the multi-modal propagation in the pipe has significant effects on the package error rate. The frequency dependent sound attenuation in the pipe also affects the communication range and data rate. In particular, for a 150 mm diameter dry pipe the maximum robot operation distance is likely to be limited to 50--100 m with the highest carrier frequency of around 10 kHz and data rates below 6300 bps. The results of this work pave the way to the development of acoustic communication modules to be deployed on tetheless robots designed to inspect a buried pipe network autonomously and collaboratively.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130864796","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

Band Gap and Waveguide Characteristics of Petal-Shaped Scatterer Phononic Crystals 花瓣形散射声子晶体的带隙和波导特性

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11881

Lin Liao, Yang Xiang, Wenbo Wang, W. Du

{"title":"Band Gap and Waveguide Characteristics of Petal-Shaped Scatterer Phononic Crystals","authors":"Lin Liao, Yang Xiang, Wenbo Wang, W. Du","doi":"10.20855/ijav.2023.28.11881","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11881","url":null,"abstract":"In this study, the Bragg petal-shaped scatterer (PS) phononic crystal (PnC) model is built to expand the width of band gap (BG). The BG characteristics of the PSPnC, square, circular, octagonal, and the \"+\" shaped scatterer PnC are compared using the finite element method (FEM). This study investigates the effects of the internal and external diameter ratio and the number of petals of single-layer petals, double-layer petals and the application of pre-deformation without changing their structure on the BG characteristics of PnCs for the transmission characteristics of supercell structures. Moreover, two different waveguides (WGs) are built with pre-deformed unit cells as the defects. As revealed by the results, the PSPnC exhibited better vibration isolation performance than PnCs with other shapes. More BGs will appear at a higher frequency with the decrease in the ratio of inner and outer diameter of petals and the increase in the number of petals. In addition, the double-layer PSPnC has high performance, and the dislocation arrangement of PS can enhance the vibration isolation performance of PSPnC. Furthermore, the WG structure is capable of guiding the energy, which provides a new insight into the establishment of the filter.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114556756","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

Detection and Quantification of Asymmetrically Located Structural Damages by Mode Converted Guided Waves Using Piezo Electric Elements 基于压电元件的模态转换导波非对称定位结构损伤检测与量化

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11920

MN Murthy Patnaik, K. Renji, KV Nagendra Gopal

{"title":"Detection and Quantification of Asymmetrically Located Structural Damages by Mode Converted Guided Waves Using Piezo Electric Elements","authors":"MN Murthy Patnaik, K. Renji, KV Nagendra Gopal","doi":"10.20855/ijav.2023.28.11920","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11920","url":null,"abstract":"Though damage identification using guided waves generated using ultrasonics is well proven, its usage for structural health monitoring poses difficulties. Piezo electric actuation and sensing overcomes this difficulty to some extent. In this work, usage of such guided waves for damage identification is investigated. Piezo electric wafer transducers are used for generating and sensing the guided waves. Presence of multiple modes and comparatively higher speeds of the guided waves throw up difficulties in damage identification. It is shown here that this problem can be addressed by considering different sensor location with respect to the damage with suitable interpretation of the results. Usage of fundamental antisymmetric (Ao) mode is found to be more suitable in localizing the damage compared to the fundamental symmetric (So) mode. Asymmetrically located damage causes mode conversion. It is demonstrated in this work that the mode converted guided wave (So) could be advantageously used for identification, localization, and quantification of the damage. Damage identification and localization schemes are evolved based on the location of the sensors with respect to the damage. It is shown that the reduction in the magnitude of the mode converted wave can be utilized for assessing the depth of the damage. 3D finite element based numerical models incorporating a PZT sensor are developed and validated with experimental results in terms of the characteristics of the waves, mode conversion due to damage and influence of the defect size on the received signals which are necessary for quantification of the damage.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127413689","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

Improving Ride Comfort of a Soil Compactor based on the NSS Embedded into the Seat's Semiactive Suspension 基于嵌入座椅半主动悬架的NSS改善土壤压实机的乘坐舒适性

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11931

Jinyu Jiang, Lujian Min, Yang Jing, Shiding Ding, Machun Yu, Wangxiang Jie

{"title":"Improving Ride Comfort of a Soil Compactor based on the NSS Embedded into the Seat's Semiactive Suspension","authors":"Jinyu Jiang, Lujian Min, Yang Jing, Shiding Ding, Machun Yu, Wangxiang Jie","doi":"10.20855/ijav.2023.28.11931","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11931","url":null,"abstract":"Three dynamic models (1-D, 2-D, and 3-D) of a soil compactor are established to research the vehicle's ride comfort via numerical simulation and experiment. Based on the efficiency of the semi-active control (SAC) of the Fuzzy-PID controller and the negative stiffness structure (NSS), a new suspension of the driver's seat equipped with the SAC and NSS is proposed to further improve the soil compactor's ride comfort under the various working conditions of the vehicle on the elastoplastic soil ground. The reduction of the root-mean-square seat acceleration (a_ws) in the time domain and the power-spectral-density seat acceleration (PSD) in the frequency domain is chosen as the objective function. The study indicates that the seat's acceleration response in the time domain with the 1-D, 2-D, and 3-D models of the soil compactor is similar. However, the a_ws and maximum PSD acceleration of the driver's seat with the 1-D model are higher than that of the 3-D model by 35.9% and 58.5%, while the acceleration response and PSD acceleration of the driver's seat with the simulation of the 3-D model are similar to the experiment. Therefore, the different dynamic models of the vehicle remarkably affect the investigation result. With the driver's seat suspension equipped with the SAC and NSS, the $a_{ws$ and maximum PSD acceleration of the driver's seat are strongly decreased by 80.1% and 87.6% compared to the seat's passive suspension without the SAC and NSS. Additionally, these values are also lower than that of oth the SAC and NSS under various simulation conditions. Consequently, the driver's seat suspension equipped with the SAC and NSS could be used to further improve the ride comfort of the soil compactor.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116794780","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

Premises for Effective Teaching and Learning: State of the Art, New Outcomes and Perspectives of Classroom Acoustics 有效教与学的前提:课堂声学的现状、新成果与展望

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11926

A. Astolfi

{"title":"Premises for Effective Teaching and Learning: State of the Art, New Outcomes and Perspectives of Classroom Acoustics","authors":"A. Astolfi","doi":"10.20855/ijav.2023.28.11926","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11926","url":null,"abstract":"Many booklets and standards have already been published on classroom acoustics in several countries, based on studies that were completed up to ten years ago and which were mainly focused on the speech intelligibility of pupils under noisy conditions. In the last decade many studies began to consider the complex speech communication scenario in classrooms, where acoustic requirements are needed for both teachers and pupils. The voice monitoring of teachers has revealed challenging conditions for speaking because of bad acoustics, with consequences on vocal health. Research has underlined the importance of voice support from the room, which has led us to reconsider the optimal reverberation time in classrooms, whose tendency is towards higher values than those for listening. On the other hand, it has been proven that a high reverberation increases the listening effort and decreases reading abilities. Thus, the question of the optimal reverberation time for speaking and listening arises, as well as the need to optimize the design of classrooms to support the voice and control the sound tail. The perceived reverberation is closely related to the perceived acoustical quality, which is recognized as the most important environmental aspect in classrooms. Reverberation also amplifies the noise produced by pupils themselves and affects their well-being. To cope with this, a new device has been introduced to inform pupils on the need to lower their voices and respect others. A summary of the state of the art of classroom acoustics is given in this lecture, together with the new findings on the effects of bad acoustics on pupils' learning and well-being and on teachers' vocal behaviour. A new paradigm on speech communication is needed in classrooms that should involve both teaching and learning. Further work is required to investigate the factors that underpin this complex communication scenario.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116693472","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