Acoustics Australia最新文献_第10页

Application of a Chebyshev Collocation Method to Solve a Parabolic Equation Model of Underwater Acoustic Propagation 应用切比雪夫配点法求解水声传播抛物方程模型

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-02-22 DOI: 10.1007/s40857-021-00218-5

Yongxian Wang, Houwang Tu, Wei Liu, Wenbin Xiao, Qiang Lan

{"title":"Application of a Chebyshev Collocation Method to Solve a Parabolic Equation Model of Underwater Acoustic Propagation","authors":"Yongxian Wang, Houwang Tu, Wei Liu, Wenbin Xiao, Qiang Lan","doi":"10.1007/s40857-021-00218-5","DOIUrl":"10.1007/s40857-021-00218-5","url":null,"abstract":"<div><p>The parabolic approximation has been used extensively for underwater acoustic propagation and is attractive because it is computationally efficient. Widely used parabolic equation (PE) model programs such as the range-dependent acoustic model (RAM) are discretized by the finite difference method. Based on the idea of the Pad<span>(acute{text {e}})</span> series expansion of the depth operator, a new discrete PE model using the Chebyshev collocation method (CCM) is derived, and the code (CCMPE) is developed. Taking the problems of four ideal fluid waveguides as experiments, the correctness of the discrete PE model using the CCM to solve a simple underwater acoustic propagation problem is verified. The test results show that the CCMPE developed in this article achieves higher accuracy in the calculation of underwater acoustic propagation in a simple marine environment and requires fewer discrete grid points than the finite difference discrete PE model. Furthermore, although the running time of the proposed method is longer than that of the finite difference discrete PE program (RAM), it is shorter than that of the Chebyshev–Tau spectral method.\u0000</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00218-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50042257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Short Review of the Use of Acoustic Emissions for Detection and Monitoring of Cracks 利用声发射检测和监测裂纹的简要综述

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-02-22 DOI: 10.1007/s40857-021-00219-4

Álvaro Carrasco, Franco Méndez, Félix Leaman, Cristián Molina Vicuña

引用次数: 9

A Review of Gear Fault Diagnosis of Planetary Gearboxes Using Acoustic Emissions 基于声发射的行星齿轮箱齿轮故障诊断研究进展

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-02-09 DOI: 10.1007/s40857-021-00217-6

Félix Leaman, Cristián Molina Vicuña, Elisabeth Clausen

引用次数: 10

News Item 新闻

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-26 DOI: 10.1007/s40857-020-00213-2

引用次数: 0

Acoustic Emission Investigation on an Electronically Controlled Two-Stroke Low-Speed Marine Diesel Engine: in Axial and Vertical Directions 电控二冲程低速船用柴油机轴向和垂向声发射研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-09 DOI: 10.1007/s40857-020-00212-3

Xuan Thin Dong, Manh Hung Nguyen

{"title":"Acoustic Emission Investigation on an Electronically Controlled Two-Stroke Low-Speed Marine Diesel Engine: in Axial and Vertical Directions","authors":"Xuan Thin Dong, Manh Hung Nguyen","doi":"10.1007/s40857-020-00212-3","DOIUrl":"10.1007/s40857-020-00212-3","url":null,"abstract":"<div><p>An experimental method in a real-working condition was conducted to collect acoustic emission (AE) signals emitted from cylinders of a large two-stroke low-speed marine diesel engine. Measurements were performed in an axial direction of the cylinder in medium-frequency (20–80 kHz) and high-frequency (100–900 kHz) ranges and in a vertical direction only in the medium-frequency range under two engine operating modes. The collected AE signals were analyzed in crank angle and crank angle–frequency domains. kurtosis and root mean square (RMS) parameters were employed to identify engine operating modes based on the obtained AE signals as well as investigate their characteristics. A fast Fourier transform (FFT) algorithm was also utilized to discover the frequency range of the AE signals. The results showed that only the AE signals generated by combustion processes, friction and wear, and exhaust valve opening (EVO) were partially detected. However, the AE signal radiated by the friction phenomenon was not apparent in the high-frequency range. Also, the combustion process had a strong influence on the remaining AE’s sources, especially in the axial direction of the medium-frequency range. Furthermore, the measurements should be implemented for the AE signals due to friction and wear in the medium and low frequencies; meanwhile, the combustion should be investigated in the frequency range of 200–300 kHz</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-020-00212-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50034679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Normative Framework of Noise Mapping in India: Strategies, Implications and Challenges Ahead 印度噪音制图的规范框架:策略、影响和挑战

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-08 DOI: 10.1007/s40857-020-00214-1

N. Garg, B. S. Chauhan, M. Singh

引用次数: 9

Structural Modifications of Headphone Front Chamber for Better Frequency Response: Experimental and Simulation Studies 改进耳机前室结构以获得更好的频率响应:实验与仿真研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-06 DOI: 10.1007/s40857-020-00211-4

Je Ru Chen, S. J. Pawar, Jin H. Huang

{"title":"Structural Modifications of Headphone Front Chamber for Better Frequency Response: Experimental and Simulation Studies","authors":"Je Ru Chen, S. J. Pawar, Jin H. Huang","doi":"10.1007/s40857-020-00211-4","DOIUrl":"10.1007/s40857-020-00211-4","url":null,"abstract":"<div><p>The supra-aural headphone concentrates the sound in the listener’s ears, so the loudspeaker sound is confined to the cavity between the pinna and the headphone casing. It is then directed toward the tympanic membrane through the ear-canal. The high-quality sound requirement of supra-aural headphone on one side and space limitation on the other prompted this research. Similarly, inherent sound leakages from headphone on one side and a need for loud sound on the other also impelled this research. This research proposes headphone design modifications for interaction between sound from the diaphragm’s rear and front side for improved frequency response. The changes attempt to stop the sound from the diaphragm’s rear side to leak to the external surrounding, and it is routed to interact with the sound from the front side of the diaphragm in two distinct ways due to the geometrical/structural modifications of the headphone front cover. Prototypes of three headphones (one traditional and two modified) have been modeled by computer-aided drafting software and fabricated by 3D printing. In parallel, equivalent circuits have been formed for the simulation as per the proposed headphone testing setup. The frequency response measurements of headphones have been done in an anechoic chamber using B&K HATS Type 4128. The simulated and measured responses of headphones demand modification of the equivalent circuit by adding the current-controlled voltage source. The optimum simulated performances of all three headphones with a modified equivalent circuit show an improved agreement with respective measured performances.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-020-00211-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50011334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Suitability of Digital Video Surveillance and Multi-beam Sonar to Monitor Saltwater Crocodiles 数字视频监控与多波束声纳监测咸水鳄的适用性

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-06 DOI: 10.1007/s40857-020-00216-z

Matthew Brien, Laurence Taplin, Richard Talmage, Simon Booth, Colby Bignell, Paul Beri, Peter Freeman, Michael Joyce

{"title":"The Suitability of Digital Video Surveillance and Multi-beam Sonar to Monitor Saltwater Crocodiles","authors":"Matthew Brien, Laurence Taplin, Richard Talmage, Simon Booth, Colby Bignell, Paul Beri, Peter Freeman, Michael Joyce","doi":"10.1007/s40857-020-00216-z","DOIUrl":"10.1007/s40857-020-00216-z","url":null,"abstract":"<div><p>Despite intensive management, the increasing conflict between humans and saltwater crocodiles in places such as Queensland, Australia, has led to the investigation of alternative techniques to improve public safety. The reliability of digital video surveillance systems (DV) placed above water and multi-beam sonar (sonar) placed under water to detect and monitor saltwater crocodiles was tested in a seminatural freshwater environment over a 2 h period (16:00–18:00 h). A total of 29 crocodiles were detected within the study area using DV, and 28 with sonar. One was obscured by a section of bank, and thus not visible on sonar. Of the 28 crocodiles detected by both methods, sonar recorded both entry and exit for all, while DV recorded both entry and exit for 15 crocodiles. The length of time that crocodiles were detected was longer on average for sonar (4 min 27 s) compared with DV (2 min 50 s). This reflected the time spent above (detected by sonar and DV) or below water (not detected by DV), as only sonar was able to detect crocodiles underwater. The use of sonar may provide a valuable management tool for detecting and monitoring saltwater crocodiles in areas frequented by people (e.g. beaches, boat ramps, upper freshwater areas) where there is a high chance of a negative interaction.\u0000</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-020-00216-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50011335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design of Tunable Acoustic Liner and Adaptive Control System 可调谐声学衬垫及自适应控制系统的设计

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-03 DOI: 10.1007/s40857-020-00210-5

Jiquan Liu, Tiexiong Su, Zhiwei Yan, Sigong Duan, Fuxiang Zhang, Haifeng Lv

{"title":"Design of Tunable Acoustic Liner and Adaptive Control System","authors":"Jiquan Liu, Tiexiong Su, Zhiwei Yan, Sigong Duan, Fuxiang Zhang, Haifeng Lv","doi":"10.1007/s40857-020-00210-5","DOIUrl":"10.1007/s40857-020-00210-5","url":null,"abstract":"<div><p>Traditional acoustic liners used in nacelles and fan ducts include a perforated face sheet bonded to a honeycomb core. A tunable acoustic liner with a piezoelectric substrate is developed to overcome the shortages of current liner such as unchangeable structure and uncontrollable bandwidth. After the piezoelectric panel deformed under the driving voltage, the resonant chamber changed, and the resonant frequency shifts. The finite element method is used to calculate the acoustic system’s resonant frequency and sound pressure distribution. The transmission loss measurement was carried out in an impedance tube to demonstrate the broadband noise control effect of the liner. The experiment result indicates that the TL peak frequency keeps linear with the driving voltage, and the sensitivity is measured to be 0.1 Hz/V. A DC amplified circuit using photo resistor is designed based on constructing the function of driving voltage and noise frequency. Benefit from the adaptive algorithm, when the noise frequency offsets from 756 to 788 Hz, the driving voltage can be automatically regulated from 110 to 420 V, and the liner always keeps resonating. Meanwhile, the sound level was reduced. The adaptive noise control is realized for broadband noise reduction.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-020-00210-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50006436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Difference Factor of Vertical Beam Pattern for Shallow-Water Source Depth Discrimination 浅水源深度判别的垂直波束模式差分因子

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-01-03 DOI: 10.1007/s40857-020-00215-0

Guang-Ying Zheng, Fang-Wei Zhu

{"title":"Difference Factor of Vertical Beam Pattern for Shallow-Water Source Depth Discrimination","authors":"Guang-Ying Zheng, Fang-Wei Zhu","doi":"10.1007/s40857-020-00215-0","DOIUrl":"10.1007/s40857-020-00215-0","url":null,"abstract":"<div><p>This study addresses the problem of source depth discrimination in the context of shallow-water acoustics. From the perspective of beam pattern correlations, a discriminating characteristic quantity, which implies the information of source depth, is presented and defined as the difference factor of the vertical beam pattern. In applying the proposed difference factor for source depth discrimination, the corresponding discrimination method and judgment criterion are presented. Numerical results, obtained by processing SwellEx-96 data recorded by a vertical line array (VLA), indicate the potential of the proposed method in source depth discrimination. This method also shows the correct discrimination of VLA signals with different frequencies by using the plus/minus sign of the difference factors of the vertical beam pattern. Effects of array aperture, array depth, signal-to-noise ratio (SNR), and environment mismatch on the performance of the current method are also analyzed to indicate the robustness of the method. Finally, the SwellEx-96 data results indicate that the proposed method is insensitive to the initial range and radial speed from the VLA to the source target.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-020-00215-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50006539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0