The International Journal of Acoustics and Vibration最新文献_第5页

Modeling of Acoustic Emission Wave and Its Parametric Characterization Based on Peak Sensor Sensitivity on an Aluminum Block 基于铝块峰值传感器灵敏度的声发射波建模及其参数表征

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11900

A. A. Rashid, M. I. Khan, K. Teramoto

{"title":"Modeling of Acoustic Emission Wave and Its Parametric Characterization Based on Peak Sensor Sensitivity on an Aluminum Block","authors":"A. A. Rashid, M. I. Khan, K. Teramoto","doi":"10.20855/ijav.2023.28.11900","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11900","url":null,"abstract":"In this paper an acoustic emission (AE) signal has been generated analytically for a homogenous material with a surface load. For the validation of the AE theory, a simulation for a developed AE wave has been conducted with computational algorithms. Experimental validation for the AE wave generation and propagation have also been performed under similar conditions. Aluminum metal block has been selected as the homogenous propagation medium for both simulation and the experiment. A function generator has been used for the excitation of a burst sine signal on the surface. A piezoelectric AE resonance sensor receives the vertical response due to the vertical load of the function generator. The algorithm of Lamb's solution has been employed in the generation of a simulated AE wave. As the transfer function, the peak sensor sensitivity of the AE sensor (R15alpha) has been incorporated along with the acoustic impedance of the metal surface and sensor. For both detected and simulated AE waves, the signal parametric characterizations have been performed based on the rise time and the maximum amplitude. The attenuation properties of the maximum amplitude and the increase of rise time with the increment of source to sensor distance has been evaluated to validate the proposed method.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"41 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":"133445636","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 Source and Load Impedance on the Insertion Loss of Expansion Chamber Hydraulic Noise Suppressors 源阻抗和负载阻抗对膨胀室液压噪声抑制器插入损耗的影响

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11888

引用次数: 0

Mechanical Equipment Performance Degradation Assessment Method Based on Improved Degradation Feature Extraction and Sample Completeness 基于改进退化特征提取和样本完备性的机械设备性能退化评估方法

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11891

Saige Lv, Xiong Hu, Bing Wang

{"title":"Mechanical Equipment Performance Degradation Assessment Method Based on Improved Degradation Feature Extraction and Sample Completeness","authors":"Saige Lv, Xiong Hu, Bing Wang","doi":"10.20855/ijav.2023.28.11891","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.11891","url":null,"abstract":"Performance degradation assessment (PDA), as an important part of health management, is playing a crucial role in evaluating the degenerate state of mechanical equipment. To evaluate the performance degradation state more effectively by using monitoring data of mechanical equipment, a PDA method based on improved degradation feature extraction technology and considering sample completeness is proposed in this paper. Firstly, multiple degradation features, including statistical features and intrinsic energy features, are extracted to construct a high-dimensional feature set calculated by time-domain analysis and the EMD method. Then, a sensitive feature set, which has significant robustness, correlation, and monotonicity in the degenerate process, is reduced and processed by the improved PCA method to obtain the final health index. Secondly, the degradation assessment model is established by considering the completeness of the samples. As for the complete sample dataset, which has both normal and failure state data, a logistic regression model (LRM) is built to assess the performance degradation status. In addition, an SVDD model is established for the incomplete sample dataset, which only has normal state data. Finally, the reliability of the proposed method is verified by the public XJTU-SY dataset, and the comparative experiment further verifies the superiority of this method.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"76 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":"126225035","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

Acoustic Emission Characteristics of Different Porcine Bones Under Loading 不同猪骨在载荷作用下的声发射特性

The International Journal of Acoustics and Vibration Pub Date : 2023-03-26 DOI: 10.20855/ijav.2023.28.11905

Weikai He, Dongliang Yan, Muxuan Liu, Xiang Gao, Ying Zhang, Dongyu Xu

引用次数: 0

The Acoustic Pa and Traceability to Fundamental Constants 声学振幅及其对基本常数的可追溯性

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.4e106

T. Koukoulas

引用次数: 0

Reconstruction of the Acoustic Field Radiated Directly from a Vibrating Structure Located Near a Pressure-Release Boundary 压力释放边界附近振动结构直接辐射声场的重建

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41886

Zhimin Chen, Daren Zhou

{"title":"Reconstruction of the Acoustic Field Radiated Directly from a Vibrating Structure Located Near a Pressure-Release Boundary","authors":"Zhimin Chen, Daren Zhou","doi":"10.20855/ijav.2022.27.41886","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41886","url":null,"abstract":"Near-field acoustical holography is a powerful tool for reconstructing the three-dimensional acoustic field radiated from a vibrating structure located in free space, but it is not applicable when the source is in a half space bounded by a reflecting boundary. This paper develops a method based on half-space spherical wave function expansion for reconstructing the acoustic field radiated directly from a source located near a pressure-release boundary. First, the series of half-space spherical wave basis functions satisfying the pressure-release boundary condition is formulated. Then the acoustic field in a half space is modeled using an expansion in this basis. The expansion coef?cients are determined by solving an overdetermined linear system of equations, obtained by matching this expansion to the measured half-space acoustic pressures. The pressures radiated directly from the source can finally be reconstructed using the free-space spherical wave function expansion with the obtained expansion coefficients. Numerical simulation examples of a vibrating plate located in water near a pressure-release boundary are demonstrated to validate the proposed method. The effects of various parameters, such as the acoustic frequency, the distance between the source and boundary, and the orientation of the source surface, on the reconstruction accuracy are examined.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114933006","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 Comprehensive Evaluation Model of Electric Bus Interior Acoustic Comfort and Its Application 电动客车内部声舒适性综合评价模型及其应用

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41887

E. Zhang, Xianyi Chen, Shiyi Li, Qiqi Wang, Jianming Zhuo

引用次数: 0

Cavitation Noise Signal Classification of Hydroturbine Based on Improved Multi-Scale Symbol Dynamic Entropy 基于改进多尺度符号动态熵的水轮机空化噪声信号分类

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41871

Ziyang Kang, Zhiliang Liu, Xinnian Guo, Liu Liu

{"title":"Cavitation Noise Signal Classification of Hydroturbine Based on Improved Multi-Scale Symbol Dynamic Entropy","authors":"Ziyang Kang, Zhiliang Liu, Xinnian Guo, Liu Liu","doi":"10.20855/ijav.2022.27.41871","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41871","url":null,"abstract":"Cavitation is a phenomenon in the operation of hydroturbine, which is related to the operation efficiency and service life of the turbine. To identify both the cavitation noise signal and the non-cavitation noise signal, prevent damage as soon as possible, and avoid irreversible damage to the hydroturbine, a new paradigm based on multi-scale information entropy is proposed in this paper. The new proposed classification model combines improved multi-scale symbol dynamic entropy (IMSDE) and least square support vector machine (LSSVM). Improved multi-scale symbol dynamic entropy is utilized to learn features from the cavitation noise signal, and then the classifier of the least square support vector machine is used to classification. Multi-scale sample entropy (MSE), multi-scale permutation entropy (MPE) and multi-scale symbol dynamic entropy (MSDE) are selected as the contrast algorithms. According to the experimental results of four different operating conditions, IMSDE has the highest recognition rate. The average recognition rate of IMSDE is higher than that of MSDE, MSE and MPE. There is no significant difference in computational efficiency of IMSDE, MSDE and MPE. In conclusion, the IMSDE method proposed in this paper is superior to MSDE, MSE and MPE, for meeting the requirements of cavitation noise signal classification.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122207095","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 Frequency Analysis and Optimization Design of Rectangular Thin Plates With Nonlinear Variable-Thickness 非线性变厚度矩形薄板的固有频率分析与优化设计

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41894

Quanmin Xie, Fengxiang Xu, Z. Zou, Xiaoqiang Niu, Zhuang Dong

{"title":"Natural Frequency Analysis and Optimization Design of Rectangular Thin Plates With Nonlinear Variable-Thickness","authors":"Quanmin Xie, Fengxiang Xu, Z. Zou, Xiaoqiang Niu, Zhuang Dong","doi":"10.20855/ijav.2022.27.41894","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41894","url":null,"abstract":"Variable-thickness thin plate structures have been widely employed in many engineering applications, such as the automotive industry, aviation industry and civil structures. In this paper, natural frequency and optimization design of nonlinear variable-thickness rectangular thin plates are performed. For this purpose, theoretical solutions of dimensionless natural frequency of the bidirectional linear variable-thickness thin plates are conducted on the three classical boundaries to verify the correctness of a conducted numerical model. Then the natural frequencies of variable thickness plates with different forms including bidirectional and unidirectional nonlinear were compared. Additionally, the difference in vibration characteristics between the thin plate of variable thickness and the corresponding thin plate of equal mass are compared and analyzed, and the results show that when the middle part of the thin plate is thick, the natural frequency increases by a greater percentage. Finally, a new bidirectional stepped variable-thickness plate is proposed to improve the natural frequency of variable-thickness thin plates. Inspired by the stepped idea, the square and circle division methods are employed to improve the natural frequency of variable thickness thin plates, as the optimal design is carried out. The results show that the nonlinear variable thickness after performing an optimal design could significantly improve the natural frequency of thin plates. The finding provides useful insight into the structural design of variable thickness plates for free vibration.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126176994","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

Dynamic Characteristics of New Mechanical Rotary Steerable Tool in Directional Drilling 定向钻井中新型机械旋转导向工具的动态特性研究

The International Journal of Acoustics and Vibration Pub Date : 2022-12-24 DOI: 10.20855/ijav.2022.27.41875

Tian Jialin, T. Lei, Hu Xuehua, S. Haolin

{"title":"Dynamic Characteristics of New Mechanical Rotary Steerable Tool in Directional Drilling","authors":"Tian Jialin, T. Lei, Hu Xuehua, S. Haolin","doi":"10.20855/ijav.2022.27.41875","DOIUrl":"https://doi.org/10.20855/ijav.2022.27.41875","url":null,"abstract":"The characteristics of a drill string system have an essential influence on the performance of directional drilling. The appropriate control method of a drill string is important to drilling efficiency and downhole operation safety. Therefore, based on a new mechanical rotary steerable tool (RST), this paper aims to analyze the Dynamic Characteristics of RST in Directional Drilling. First, considering the thrust force generated by the RST and bottom hole assembly (BHA), the governing vibration equations of a drill string system are established. Furthermore, connected with fields drilling parameters, including the effects of a new RST on a drill bit and wellbore, as the boundary and initial conditions, the dynamic characteristics of a drill string system are compared and studied in directional and straight drilling. The results show that the axial vibration of the drill string increases extremely in directional drilling process, while the weight on bit (WOB) and inclination force change in small range. Moreover, the torque and azimuth force tend to be stable soon, even its initial fluctuations are significantly. Also, the new RST can effectively enhance the steering capacity, increase the drilling efficiency, and improve drill bit force performance. The research results can provide reference for developing directional drilling technologies, including related tool design and optimization.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129434931","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