The International Journal of Acoustics and Vibration最新文献_第2页

Experimental Validation of Reconstruction of Sound Source Radiation in an Underwater Half-Space Bounded by a Water-Air Interface 水气界面限定的水下半空间声源辐射重构实验验证

The International Journal of Acoustics and Vibration Pub Date : 2024-03-29 DOI: 10.20855/ijav.2024.29.12024

Zhimin Chen, Daren Zhou, Jingjun Lou, Min Peng, Yongxiong Xiao, Xiangle Cheng, Zeyu Ru

{"title":"Experimental Validation of Reconstruction of Sound Source Radiation in an Underwater Half-Space Bounded by a Water-Air Interface","authors":"Zhimin Chen, Daren Zhou, Jingjun Lou, Min Peng, Yongxiong Xiao, Xiangle Cheng, Zeyu Ru","doi":"10.20855/ijav.2024.29.12024","DOIUrl":"https://doi.org/10.20855/ijav.2024.29.12024","url":null,"abstract":"When a vibrating structure is located in a half-space bounded by a reflecting surface, the measured sound pressures are polluted by the reflection, so that they cannot show the actual sound radiation from the structure. The half-space spherical wave function expansion-based near-field acoustical holography approach is proposed to reconstruct the direct radiation from the sound source using the polluted sound pressures, which has been validated by numerical simulations. This paper deals with the experimental validation of this approach applied in an underwater half-space bounded by a water-air interface. The sound pressures measured in the half-space are used as the input data. The reconstructed sound pressures obtained are compared with benchmarks measured in a free space. The results indicate that the influences of the water-air interface reflection on the measured sound pressures can be greatly reduced in the entire frequency range investigated. The normalized relative reconstruction error introduced by the parameters of the hydrophone array and the water tank in the experiment is analyzed. The results of the experimental validation show that the proposed approach is promising for accurately measuring sound signals radiated from manned or unmanned vehicles or equipment underwater near a water-air interface.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"21 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140368355","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 Micro-Turbine Operating State Characterization Based on Bearing Vibration Signals Analysis 基于轴承振动信号分析的微型燃气轮机运行状态表征研究

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41997

Ning Li, Xiaowei Wang, Tongguang Yang, Qingkai Han

{"title":"Research on Micro-Turbine Operating State Characterization Based on Bearing Vibration Signals Analysis","authors":"Ning Li, Xiaowei Wang, Tongguang Yang, Qingkai Han","doi":"10.20855/ijav.2023.28.41997","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41997","url":null,"abstract":"An air flow-driven micro-turbine, widely used in air-condition control systems in aircraft cabins, train coaches, etc., exhibits complex vibration behaviors under stable or unstable inlet flow conditions, and especially has a certain correlation with speeds. In this paper, the vibration responses of the micro-turbine undergoing stable and unstable inlet flows measured on a test rig are analyzed and compared by using different signal processing methods, which include time and frequency domain methods, and statistical and nonlinear methods. First, the test rig system of the airflow-driven micro-turbine, the instrument system and four typical experimental cases are introduced. Then the measured vibration signals are analyzed and compared by time domain characteristic parameters (peak-to-peak value, RMS value and kurtosis value), statistical parameters (auto-correlation and BDS), and amplitude spectra in the frequency domain, statistic spectrum indicators (SSI) based on Welch's periodogram of power spectra, and the spectra of selected IMF components based on Hilbert-Huang Transform (HHT). In particular, some nonlinear feature analyzing methods, including Pseudo-Poincare mapping diagrams and Lempel-Ziv(LZ) complexity, are also used for analyzing measured vibration responses. The obtained results using the above multiple methods are compared and show that, when the inlet flow of the turbine fluctuates significantly, the nonlinear characteristics of the turbine bearings are significantly higher than those of the relatively stable inlet flow and speed conditions. Under these circumstances, commonly used time-frequency analysis methods cannot characterize the different speed operating state of the turbine, and LZ-Complexity and other nonlinear characterization methods should be used to better understand the characteristics of different speeds under unstable conditions.This study provides references for the aerodynamic stability monitoring of the micro-turbine and its design improvement.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"20 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139148563","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

Structure Research of Resistance Shunt Type Piezoelectric Composite and Underwater Sound Absorption Performance Analysis 电阻分流型压电复合材料的结构研究及水下吸声性能分析

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41983

Yang Sun, B. Hua

{"title":"Structure Research of Resistance Shunt Type Piezoelectric Composite and Underwater Sound Absorption Performance Analysis","authors":"Yang Sun, B. Hua","doi":"10.20855/ijav.2023.28.41983","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41983","url":null,"abstract":"The high-efficiency sound absorption of underwater sound-absorbing materials under \"low frequency\" and \"wide frequency\" conditions has become a hot topic in current research. Underwater semi-active sound absorption can help to improve low frequency sound absorption performance by designing the structure of the piezoelectric composite and the shunt circuits, and it is also advantageous due to its simplicity, compactness, ease of installation, low cost, and high stability. In this paper, a kind of resistance shunt type piezoelectric composite is designed, and its underwater sound absorption performance is analyzed. Theoretical analytical formulas and finite element numerical calculation are used to calculate the electro-elastic constants of the piezoelectric composite. The theoretical model based on the Mason equivalent circuit and transfer matrix theory is used to calculate the sound absorption coefficient. Through the study of 0-3 and 1-3 composites used in the existing research work, it was found that the piezoelectric composite which is suitable for resistance shunt type underwater semi-active sound absorption should have a low longitudinal wave velocity and high electromechanical conversion coefficient. According to this design objective, the structure of the piezoelectric composite has been gradually modified, and finally it is determined that the sparse oblique 2-1-3 composite is an appropriate type of piezoelectric composite. Theoretical calculations and simulation experimental measurement verifies that when the inclination angle is 21 deg and the shunt resistance is 10 kOhm or the inclination angle is 24 deg and the shunt resistance is 10 kOhm, the sound absorption coefficient within the low frequency band 1--3~kHz can be significantly improved.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"37 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139152017","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

Active Vibration Control of a Quarter-Car Model via a Time-Delayed Vibration Absorber 通过延时振动吸收器对四分之一节车厢模型进行主动振动控制

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.42000

Yixia Sun

引用次数: 0

Transfer Learning for Anomaly Detection Using Bearings' Vibration Signals 利用轴承振动信号进行异常检测的迁移学习

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41993

Diego Nieves-Avendano, Dirk Deschrijver, Sofie Van Hoecke

{"title":"Transfer Learning for Anomaly Detection Using Bearings' Vibration Signals","authors":"Diego Nieves-Avendano, Dirk Deschrijver, Sofie Van Hoecke","doi":"10.20855/ijav.2023.28.41993","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41993","url":null,"abstract":"Predictive maintenance is becoming increasingly important in the industry. Despite considerable advances in data collection and data-driven models, there are still limitations when deploying models in practice. One of the main limitations is the large datasets required to train these models. As a potential solution, transfer learning can be used to reuse knowledge acquired from large datasets for similar tasks under different conditions. This paper investigates the transferability of the specific anomaly detection scenario, an unsupervised learning task with heavily imbalanced label distribution. This paper uses a dataset generated from a bearing test platform in which bearings are run until failure under different operating conditions. A lightweight deep learning model, MobileNetV2, is employed to create a baseline model capable of detecting anomalies for a specific working condition. The model is then adapted using transfer learning to identify anomalies under new operating conditions with limited data accurately. The results show that the data for new conditions is insufficient to train an adequate model and that transfer learning can overcome this limitation. The adapted models can detect anomalies before the expert's knowledge reference value. Although this shows that transfer learning can detect anomalies earlier, the results must be evaluated carefully to avoid false positives. While anomaly detection aims to identify changes in feature distributions, transfer learning aims to align different feature distributions. Transfer learning for unsupervised learning has rarely been explored. To the best of our knowledge, this is one of the few works addressing it in the context of predictive maintenance for anomaly detection.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"64 S12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139151860","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

Development of a Systematic Methodology for Active Noise Control with Vehicle Engine Mounts Excitation 利用汽车发动机悬置激励开发主动噪声控制系统方法学

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.42010

Kyoung-Jin Chang, Simon Roberts

{"title":"Development of a Systematic Methodology for Active Noise Control with Vehicle Engine Mounts Excitation","authors":"Kyoung-Jin Chang, Simon Roberts","doi":"10.20855/ijav.2023.28.42010","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.42010","url":null,"abstract":"Active noise control (ANC) technology using speakers as actuators has an excellent performance, but since it generates anti-noise signals in a path completely different from the vehicle's noise source, performance can be greatly reduced at a location far from the error sensor, and this problem can get worse as the frequency to be controlled increases. Another approach is the vibration-based ANC technology that excites the body member around the engine mount and reduces acoustic error signals in a passenger compartment. This approach has the advantage of being effective even at a distance from the error sensor and reducing vibration and noise together when trying to cancel out the structure borne noise generated by the engine because the paths from the primary source and the secondary source to the interior are almost identical. This paper presents a systematic methodology for this vibration-based ANC technology to achieve high performance in vehicles. First, through noise reduction simulation, the number of error sensors, the location of actuators, the force requirements, and an appropriate system are proposed. Next, to improve performance even with a small number of actuators and limited power when applying this technology in vehicles, an algorithm using the control effort weighting parameter is introduced into the existing FxLMS algorithm and modelled on the controller. Finally, a noise reduction control test is performed in a vehicle under static and driving conditions, and the results are reviewed.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"12 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150166","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

Fault Diagnosis of Synchronous Generator Based on Adaptive Chirp Mode Decomposition Permutation Entropy and Deep Learning 基于自适应啁啾模式分解迭代熵和深度学习的同步发电机故障诊断

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41977

Chao Zhang, RuiQing Jin, ChenXin Li

引用次数: 0

Dynamic Characteristics and Optimization of Segmented Fork Arm Seat System 分段式叉臂座椅系统的动态特性与优化

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41980

Zhanlong Li, Zhizhao Ren, Haiqing Zhang, Zhang Zheng, Song Yong, Sun Bao

{"title":"Dynamic Characteristics and Optimization of Segmented Fork Arm Seat System","authors":"Zhanlong Li, Zhizhao Ren, Haiqing Zhang, Zhang Zheng, Song Yong, Sun Bao","doi":"10.20855/ijav.2023.28.41980","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41980","url":null,"abstract":"To improve the low-frequency vibration isolation performance and driving comfort of the engineering seat system, a segmented fork arm seat system is proposed. Firstly, the equivalent model of the n-level segmented seat system is established, the amplitude-frequency response function and phase-frequency response function of the segmented seat system are solved and analyzed. The theoretical study shows that, with the increase of segment levels, the response time of the seat system is shortened, and the attenuation rate of response amplitude is accelerated; with the increase of segment levels, the resonance peak value of the seat system tends to shift continuously, and the low-frequency vibration isolation range expands. Secondly, according to the actual application condition of a loader, the engineering structure of the 3-level segmented fork arm seat system was built, and the structure-stiffness parameters of the segmented fork arm seat system were optimized by multi-objective genetic algorithm. The optimization results show that the 3-level segmented fork arm seat system has obvious vibration reduction effect on the sensitive frequency band of the human body. The vibration reduction effect on road excitation increases by 63.2% on average under driving conditions, 75.8% on uneven road surface, and 65.2% under operating conditions, and the subjective comfort evaluation index of human body increases by two levels.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"27 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139148253","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

Vehicle Intermittent Idle Shake: Mechanism and Influence Factors 车辆间歇性怠速抖动：机理和影响因素

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41938

Xiaoyi Jia, Jian Pang, Xiao-Min Xu, Xing-Quan Li, Tao Li, Jian Jiang, Yi-Qian Zheng, Zhi-Hong Yin, Wen-Bin Shangguan

{"title":"Vehicle Intermittent Idle Shake: Mechanism and Influence Factors","authors":"Xiaoyi Jia, Jian Pang, Xiao-Min Xu, Xing-Quan Li, Tao Li, Jian Jiang, Yi-Qian Zheng, Zhi-Hong Yin, Wen-Bin Shangguan","doi":"10.20855/ijav.2023.28.41938","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41938","url":null,"abstract":"This paper studies the mechanism and influencing factors of the intermittent shaking of a vehicle in idle conditions and explores methods to suppress the idle shake of a vehicle. A full vehicle model including an engine crank-link mechanism is established. Taking a vehicle with intermittent idle shake as an example, the causes of the intermittent idle shake of the vehicle are investigated. The study shows that the intermittent idle shake of the vehicle is caused by the beat vibration, which is due to the unbalance of the crankshaft of the engine and the rotating turbine of the torque converter, and the near rotational speeds of these two rotating parts. In addition, a parametric model of cylinder pressure is presented. The effects of abnormal cylinder pressure (abnormal amplitude, abnormal ignition phase and abnormal fluctuating rate) on the idle shake are analyzed respectively. It is found that changes of combustion pressure in cylinder may also cause intermittent idle shake of the vehicle. Finally, the measures to attenuate the intermittent idle shake of vehicle are presented.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"14 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139148540","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 Attenuation Prediction of Perforated Reactive and Dissipative Mufflers With Flow by Using Frequency-Domain Linearized Navier-Stokes Equations 利用频域线性化纳维-斯托克斯方程预测带流穿孔反应式和耗散式消声器的声衰减

The International Journal of Acoustics and Vibration Pub Date : 2023-12-28 DOI: 10.20855/ijav.2023.28.41981

Zhirong He, Zhenlin Ji, Hongpu Huang

{"title":"Acoustic Attenuation Prediction of Perforated Reactive and Dissipative Mufflers With Flow by Using Frequency-Domain Linearized Navier-Stokes Equations","authors":"Zhirong He, Zhenlin Ji, Hongpu Huang","doi":"10.20855/ijav.2023.28.41981","DOIUrl":"https://doi.org/10.20855/ijav.2023.28.41981","url":null,"abstract":"To comprehensively consider the impact of complex airflow on sound propagation, a numerical approach by solving the three-dimensional (3-D) frequency-domain linearized Navier-Stokes equations (LNSEs) is proposed to accurately predict the transmission losses of perforated tube reactive and dissipative mufflers in the presence of complex airflow. The numerical computations are performed in two steps: (1) solve the time averaged flow by steady-state computational fluid dynamics (CFD) simulation and then map the results into acoustic mesh; (2) treat sound-absorbing material as an equivalent fluid and obtain acoustic perturbation variables by solving the frequency-domain LNSEs. The transmission losses of perforated tube reactive and dissipative mufflers are measured in the presence of flow and compared with the numerical predictions. The excellent consistencies between predictions and measurements validate the present approach. The influence of Mach number on acoustic attenuation performance of perforated tube reactive and dissipative mufflers is then investigated. With Mach number increases, the transmission loss of perforated tube reactive muffler increases somewhat, while the transmission loss of dissipative mufflers decreases obviously in the lower frequency range and change is limited at higher frequencies.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"52 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139149550","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