Acoustics Australia最新文献_第9页

The Effects of Hydrophone End-Cap Extension on the Flow-Generated Noise 水听器端盖扩展对流动噪声的影响

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-07-05 DOI: 10.1007/s40857-021-00247-0

Guan Guan, Zhengmao Zhuang, Qu Yang

引用次数: 1

News Item 新闻

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-06-18 DOI: 10.1007/s40857-021-00246-1

引用次数: 1

Acoustic Effect of Face Mask Design and Material Choice 面罩设计与材料选择的声学效果

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-06-03 DOI: 10.1007/s40857-021-00245-2

B. T. Balamurali, Tan Enyi, Christopher Johann Clarke, Sim Yuh Harn, Jer-Ming Chen

引用次数: 11

Research on the Ambient Noise Observation Technology Based on the Underwater Glider 水下滑翔机环境噪声观测技术研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-06-01 DOI: 10.1007/s40857-021-00243-4

Chao Wang, Meng Yuan

{"title":"Research on the Ambient Noise Observation Technology Based on the Underwater Glider","authors":"Chao Wang, Meng Yuan","doi":"10.1007/s40857-021-00243-4","DOIUrl":"10.1007/s40857-021-00243-4","url":null,"abstract":"<div><p>The underwater glider is a new type of unpowered, unmanned, moving observational platform with advantages of low-noise level, long operation time, far sustainable range, and high cost-effectiveness. In the paper, based on the underwater glider platform integrated with single vector acoustic sensor, an underwater acoustic glider platform is developed with the ability to detect target direction and observe the ambient noise. The acoustic measurement system and the self-noise of the glider platform under each working condition are tested to analyze the self-noise levels of the acoustic system and the primary noise sources of the platform, and conduct the vibration and noise reduction processing of the platform and optimize the working mode of the acoustic system. The test result shows that the underwater acoustic glider with the optimization has the ability to observe the ambient noise only on the pressure hydrophone channel. With the data sampled from one of the underwater gliders of the sea trial organized in a certain area of the South China Sea in August 2019, authors analyze the variation of spectrum levels of the ambient noise with the depth and the time at the center of seven frequency points (63 Hz, 100 Hz, 200 Hz, 400 Hz, 800 Hz, 1.6 kHz and 3.15 kHz) and discuss the influence of the sailing vessel close to the glider on it. The experimental result shows that the underwater acoustic glider, as an unscrewed moving platform, can be well used to monitor the ambient noise properties over a long term.\u0000</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"49 3","pages":"485 - 493"},"PeriodicalIF":1.7,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00243-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49999423","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: 2

Research on Active Sonar Object Echo Signal Enhancement Technology in the Spatial Fractional Fourier Domain 空间分数傅立叶域主动声纳目标回波信号增强技术研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-28 DOI: 10.1007/s40857-021-00244-3

Yang Yang, Shuo Yang, Yuanming Ding

{"title":"Research on Active Sonar Object Echo Signal Enhancement Technology in the Spatial Fractional Fourier Domain","authors":"Yang Yang, Shuo Yang, Yuanming Ding","doi":"10.1007/s40857-021-00244-3","DOIUrl":"10.1007/s40857-021-00244-3","url":null,"abstract":"<div><p>The detection and recognition of quiet, small objects in shallow water is one of the challenges in underwater acoustic signal processing, especially for buried objects. The seafloor strongly absorbs sound waves, while the object echo signals are weak, which makes the detection of the buried objects more difficult. Realizing object echo signal enhancement in a seafloor reverberation background and improving the signal-to-reverberation ratio (SRR) are critical problems. Based on the difference in energy aggregation between object echo signals and reverberation in the optimal fractional Fourier domain, a blind separation algorithm in the spatial fractional Fourier domain is presented. Expressions of the object rigid scattering components and the reverberation in the fractional Fourier domain are derived, and the energy distribution characteristics of both are analyzed. The objective function is constructed by the generalized correlation matrix of the multiple array signals in the optimal fractional Fourier domain, and the object rigid scattering components are obtained by approximate joint diagonalization. The simulation and data processing results show that the spatial fractional domain blind separation algorithm (FRFTBSS) can improve the signal-to-reverberation ratio. Compared with time–frequency domain blind separation (TFBSS), the proposed algorithm avoids the cross-item interference and performs better at lower SRR.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"49 3","pages":"495 - 504"},"PeriodicalIF":1.7,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00244-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50103703","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

Scattered Acoustic Field Above a Rectangular Cavity in a Rigid Plane Insonified by a Deterministic Field 刚性平面中不含确定性场的矩形腔上方的散射声场

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-17 DOI: 10.1007/s40857-021-00240-7

A. Khanfir, J. Ducourneau

引用次数: 2

The Acoustic Characterization of Worship Ambiance and Speech Intelligibility in Wooden Hypostyle Structures: The Case of the Aslanhane Mosque 木质结构中礼拜氛围的声学特征和言语可理解性:以阿斯兰汗清真寺为例

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-13 DOI: 10.1007/s40857-021-00238-1

Kivanc Kitapci, Gülşah Çelik Başok

{"title":"The Acoustic Characterization of Worship Ambiance and Speech Intelligibility in Wooden Hypostyle Structures: The Case of the Aslanhane Mosque","authors":"Kivanc Kitapci, Gülşah Çelik Başok","doi":"10.1007/s40857-021-00238-1","DOIUrl":"10.1007/s40857-021-00238-1","url":null,"abstract":"<div><p>The challenge in the acoustics design of the traditional mosque is twofold. First, the interior atmosphere of the space should create a sacred feeling on the users' holistic and phenomenological spatial perception, which is generally recognized as a direct effect of increased reverberation time (T30) and low clarity (C80). Second, speech should be adequately intelligible, which requires a low T30 and high speech clarity, contradicting the initial concern of the sacred atmosphere. We hypothesize that in Islamic architecture, wooden hypostyle mosques may comply better with the reverberation time requirements of speech intelligibility, while maintaining the sacred feeling, due to their comparatively absorptive surface finishing materials and structural elements. The Aslanhane Mosque is a unique sacred structure within its era of construction, well-known with its wooden columns and ceiling. It is an important case for room acoustics analysis of such holy spaces. This study aimed to analyze the room acoustic measurement results of the Aslanhane Mosque, evaluating the intelligibility of speech and interpreting the sacred feeling created by reverberance, envelopment, and spaciousness, which are all crucial in such holy structures. It is revealed that although the Aslanhane Mosque's subjective rating for speech intelligibility is “good,” the overall low volume of the mosque and the lack of surface reflections decrease the sacred sensation. Additionally, the intelligibility of speech is vulnerable to obstacles within the line of sight, such as load-bearing columns. Lastly, it was observed that the increase in T30 at low frequencies improved the sacred sensation, envelopment, and spaciousness, without any profound negative impact on the intelligibility of speech.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"49 3","pages":"425 - 440"},"PeriodicalIF":1.7,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00238-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50024295","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: 2

Bandgaps Creation with High Acoustic Losses in Gradient-Based Sonic Crystals 基于梯度的声波晶体中高声损失带隙的产生

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-12 DOI: 10.1007/s40857-021-00242-5

D. Panda, A. R. Mohanty

{"title":"Bandgaps Creation with High Acoustic Losses in Gradient-Based Sonic Crystals","authors":"D. Panda, A. R. Mohanty","doi":"10.1007/s40857-021-00242-5","DOIUrl":"10.1007/s40857-021-00242-5","url":null,"abstract":"<div><p>A design of the sonic crystal (SC), called the gradient-based sonic crystal (GBSC), that uses the gradient of properties of the SC array is proposed as an improvement over the traditional design of SCs. The gradient of properties is obtained by changing the resonator dimensions and the distance between them throughout the array instead of keeping them uniform. Because of this non-uniformity, the supercell approximation was used to handle the non-ideal periodic conditions it induces in the array. GBSCs in non-uniform rectangular and triangular lattices were designed and analyzed using the finite element method. The results show that the GBSCs widen existing bandgaps, create new bandgaps, induce high acoustical losses compared to the uniform SCs of Helmholtz resonators (HR) or hollow scatterers (HS) and have similar space requirements. Therefore, the GBSCs can be used for acoustic attenuation in low-mid-high frequency bands. Parameters such as increasing or decreasing order of the resonator size and distance, and the resonator orientation were found to influence the attenuation by the GBSCs. Experiments were conducted on the traditional uniform HS sonic crystals and HR sonic crystals and their finite element (FE) models were developed which were later useful for developing robust FE models of the GBSCs.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"49 3","pages":"473 - 484"},"PeriodicalIF":1.7,"publicationDate":"2021-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00242-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50021529","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

Experimental and Numerical Investigation of Sound Radiation from Thin Metal Plates with Different Thickness Values of Free Layer Damping Layers 不同自由层阻尼层厚度金属薄板声辐射的实验与数值研究

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-11 DOI: 10.1007/s40857-021-00241-6

İlhan Yılmaz, Ersen Arslan, Kadir Çavdar

{"title":"Experimental and Numerical Investigation of Sound Radiation from Thin Metal Plates with Different Thickness Values of Free Layer Damping Layers","authors":"İlhan Yılmaz, Ersen Arslan, Kadir Çavdar","doi":"10.1007/s40857-021-00241-6","DOIUrl":"10.1007/s40857-021-00241-6","url":null,"abstract":"<div><p>Sound radiation from thin metal plates has consistently been recognized as a severe noise problem. One of the most popular approaches to suppressing this noise is applying viscoelastic layers, also called free layer damping (FLD), on the plate surface, which can damp the structural motion and minimize the radiated sound. The thickness of the FLD is an important parameter. It needs to be optimized for the target acoustic limits through numerical simulations, as the total mass and the costs may rise unnecessarily. This paper investigates the sound radiation from thin metals of particular sizes with different thickness values of FLD. A unique test setup was established to measure vibration and sound for three different sized plates, with each one having three different FLD thicknesses, namely, 0.5 mm, 0.75 mm, and 1 mm. In parallel, vibro-acoustic analyses were performed for the same configurations using the finite element method. The damping of the FLD was defined using the Rayleigh damping model, of which coefficients were obtained through a prediction formula developed earlier by the authors. After validating the model with the test, the effect of FLD on the extended acoustic parameters (radiated sound power, directivity) was also analyzed.</p></div>","PeriodicalId":54355,"journal":{"name":"Acoustics Australia","volume":"49 3","pages":"459 - 472"},"PeriodicalIF":1.7,"publicationDate":"2021-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40857-021-00241-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50042383","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: 3

Acoustic Attenuation of Hybrid Sonic Crystal Made with Periodic Cylindrical Scatterers and Porous Panels 周期性圆柱散射体与多孔板混合声晶体的声衰减

IF 1.7 4区物理与天体物理

Acoustics Australia Pub Date : 2021-05-10 DOI: 10.1007/s40857-021-00239-0

Karisma Mohapatra, D. P. Jena

引用次数: 6