Applied Acoustics最新文献

{"title":"Interaction effect of reproducing spatialized human-induced and environmental sounds from nearby sources on the social Simon effect","authors":"Takumi Asakura","doi":"10.1016/j.apacoust.2024.110343","DOIUrl":"10.1016/j.apacoust.2024.110343","url":null,"abstract":"<div><div>Advancements in virtual reality technology have led to a corresponding increase in demand for virtual environments with multimodal reality in terms of not only visual, but also auditory, tactile, olfactory, and gustatory stimuli. From an auditory standpoint, to reproduce a more realistic space in which audio communication with others occurs, the influence of acoustic reproduction methods on the sense of presence of another person needs to be examined. Assuming a virtual environment in which either artificial sounds generated by others or nonhuman background sounds generated in the surroundings, or both, coexist, the present study investigated the behavioral and psychological effects of the three-dimensional spatialization of human- and nonhuman-induced background sounds on users. First, human- and nonhuman-induced background sounds were reproduced in three different ways: binaural, quasi-binaural, and diotic playback. Next, experiments were conducted to evaluate the subjective impression of the sense of someone being present in the environment and to confirm the social Simon effect (SSE), which is excited by the imagined presence of others nearby. The results revealed that both the behavioral emergence of SSE and subjective impressions of the presence of others coexisting nearby are strongly influenced by the relative degree of spatialization of both human- and nonhuman-induced environmental sounds.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance of a generalised algorithm for the detection of noise events from road traffic in a real urban area: A simulation study","authors":"Sacha Baclet ,&nbsp;Romain Rumpler","doi":"10.1016/j.apacoust.2024.110337","DOIUrl":"10.1016/j.apacoust.2024.110337","url":null,"abstract":"<div><div>The assessment of the exposure to road traffic noise pollution and of associated health conditions is usually based on energy-average noise levels. However, the number of noise events to which an individual is exposed has proven essential to the prediction of annoyance and sleep disturbance.</div><div>Unfortunately, no standard method has been adopted for the counting of noise events. To address this shortcoming, Brown and De Coensel designed, in 2018, a generalised algorithm for the detection of road traffic noise events. The authors evaluated the performance of this algorithm for multiple sets of input parameters, but the setup employed for this testing was simplistic.</div><div>The present study thus aims to benchmark the proposed parameter sets for the noise event detection algorithm in a controlled but realistic environment, consisting of a calibrated microscopic traffic simulation in the entire city of Tartu, Estonia, which includes interrupted traffic conditions and urban infrastructure.</div><div>The performance assessment of a parameter set is shown to be highly dependent on context, <em>i.e.</em>, location and time of day, making definitive, universally applicable conclusions unrealistic. Rather, this study enables comprehensive insights that guide the selection of adapted parameter sets for various traffic situations, including the number of parameter sets, suitable detection thresholds, and recommended time gaps to implement.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rotor noise in non-axial inflow conditions","authors":"Liam Hanson ,&nbsp;Zilei Yi ,&nbsp;Bin Zang ,&nbsp;Mahdi Azarpeyvand","doi":"10.1016/j.apacoust.2024.110345","DOIUrl":"10.1016/j.apacoust.2024.110345","url":null,"abstract":"<div><div>This paper presents an experimental study on characterising the aerodynamic and far-field acoustic performance of rotors operating in non-axial inflow conditions. The current experiments were carried out with a two-bladed rotor, operating with a tip Mach number of 0.56, approaching the practical tip Mach numbers expected of urban air mobility vehicles. Synchronous measurements of the aerodynamic force, far-field acoustics and blade phase angle were undertaken to provide insights on both the time-averaged and phase-averaged correlation between the rotor aerodynamic loading and the emitted noise. The far-field acoustic spectra are compared across a range of advance ratios (<span><math><mn>0.01</mn><mo>≤</mo><mi>μ</mi><mo>≤</mo><mn>0.04</mn></math></span>) and forward tilting angles (<span><math><mn>0</mn><mi>°</mi><mo>≤</mo><mi>α</mi><mo>≤</mo><mn>30</mn><mi>°</mi></math></span>). When the inflow velocity increases, both the tonal and broadband components increase. Moreover, higher harmonics of the blade passing frequency are observed to become more prominent at higher advance ratios. As the rotor tilts forward from edgewise flight conditions, the broadband noise component reduces significantly, with the tones at fundamental blade passing frequency and higher harmonics also reducing in magnitude, agreeing well with the steady and unsteady thrust coefficients measured. From the aerodynamic loading, acoustic spectra and the directivity results, a transition from near-edgewise to near-axial modes of operation can be discerned at a tilt angle of approximately 16°. More interestingly, the phase-averaged thrust and acoustic power results show notable variations of the blade loading and acoustic emission through one full rotor rotation. At higher advance ratios and shallow tilting angles, the phase location of peaks in the root-mean-square of the fluctuating thrust coefficient agrees very well with those from the acoustic power, suggesting a strong correlation between the flow unsteadiness and the noise at these non-axial conditions, contributing to higher overall sound pressure levels.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Maximizing attenuation of sound waves preserving air permeability in sonic crystals via topology optimization","authors":"Zhiyuan Jia ,&nbsp;Yi Yan ,&nbsp;Yuhao Bao ,&nbsp;Yangjun Luo ,&nbsp;Dazhi Wang ,&nbsp;Xiaopeng Zhang ,&nbsp;Zhan Kang","doi":"10.1016/j.apacoust.2024.110348","DOIUrl":"10.1016/j.apacoust.2024.110348","url":null,"abstract":"<div><div>The evanescent waves within a bandgap can describe the sound wave attenuation degree. A topology optimization method of designing sonic crystals (SnCs) with maximum sound wave attenuation properties is presented in this paper. The optimization procedure maximized the minimum positive imaginary component of the wave vector at the designated frequency. To ensure that an SnC would maintain adequate air permeability and an acceptable air channel width even when the solid material configuration is highly complex, the virtual temperature method was used in the optimization model along with filtering and threshold projection techniques. The material-field series expansion scheme was adopted to refine the SnC configurations, and the Kriging-based optimization algorithm was utilized to solve the complex problem. Optimization results were obtained for different air channel widths and frequencies, and each optimization process culminated in the establishment of an omnidirectional bandgap of sound waves at the target frequency. For most of the optimization results, the minimum decay contours were approximately circular, which indicates that the optimized SnC structures possessed comparable spatial attenuation properties for sound waves in all directions. Finite element simulations and physical experiments validated the effectiveness of the proposed optimization method of designing air–solid SnCs that exhibit enhanced spatial decay of evanescent waves. These optimized SnCs displayed excellent sound attenuation performance, thereby demonstrating their significant potential for noise-reduction applications.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Time-frequency analysis of speech signals using the Stockwell transform for the detection of upper respiratory tract infection","authors":"Pankaj Warule ,&nbsp;Siba Prasad Mishra ,&nbsp;Suman Deb ,&nbsp;Jarek Krajewski","doi":"10.1016/j.apacoust.2024.110339","DOIUrl":"10.1016/j.apacoust.2024.110339","url":null,"abstract":"<div><div>The acoustic properties of speech demonstrate modifications in the presence of different health states. Biomedical engineering has great promise for creating non-invasive diagnostic processes that use speech as a biomarker. The use of speech indications to screen for upper respiratory tract infections (URTIs), such as the common cold, may have potential advantages in terms of limiting transmission. In this study, we have employed the Stockwell transform -based time-frequency (TF) analysis of speech signals for URTI detection. The Stockwell transform is applied on speech signals to derive their TF representation. Using a TF matrix, the various statistics of magnitude and phase are calculated and used as features for classifying speech of healthy speakers and speakers with URTI. The URTIC database is employed for evaluating the proposed features. The utilization of an ensemble of support vector machines (SVM) is proposed as a classification approach to address the issue of class imbalance. The results show that the proposed method produces comparable outcomes to state-of-the-art approaches. The proposed features obtain 66.53% and 64.65% UARs on the development and test partitions of the URTIC database.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Vibroacoustic characterization of small woven fabrics","authors":"Weihan Shen ,&nbsp;Zenong Cai ,&nbsp;Radoslav Darula ,&nbsp;Frieder Lucklum","doi":"10.1016/j.apacoust.2024.110350","DOIUrl":"10.1016/j.apacoust.2024.110350","url":null,"abstract":"<div><div>This study is aimed to analyze the vibroacoustic behaviour of woven fabrics utilized in small acoustic devices for ingress protection. We first concentrate on predicting and describing the vibration behaviour of the woven fabric structure through flip around, since lumped modelling comes first. A vibration experiment is also conducted to measure the motion of the woven fabric structure under external excitation to validate the modelling. The numerical model is then employed to simulate the vibroacoustic behaviour of the woven fabric via transmission loss calculation; the simulation is then compared with transmission loss measurement based on the four-microphone method. This research demonstrates that despite some limitations, both the numerical and lumped models show a good degree of accuracy in predicting the vibration of the woven structure; the numerical model also performs well in vibroacoustic modelling.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Omnidirectional sound wave absorption based on the multi-oriented acoustic meta-materials","authors":"Xiaotian Bai ,&nbsp;Zhaoyang Xiao ,&nbsp;Huaitao Shi ,&nbsp;Ke Zhang ,&nbsp;Zhong Luo ,&nbsp;Yuhou Wu","doi":"10.1016/j.apacoust.2024.110344","DOIUrl":"10.1016/j.apacoust.2024.110344","url":null,"abstract":"<div><div>Acoustic <em>meta</em>-materials have become a hot topic in rotary equipment sound absorption with advantages of small size and additional mass, but the effectiveness is significantly limited by the incident angle and the absorption performance is not good in random sound fields. This paper proposes a multi-oriented acoustic <em>meta</em>-material (MOAMM) that can be applied in omnidirectional sound wave absorption, which is composed of unit cells with different orientations. The single cell is designed as a double-cavity labyrinth structure, and the unit cells are distributed uniformly in a circumference to adapt to incident waves from different directions. The absorption performance is compared with the structure of same-oriented distribution, and parametric studies are carried out for the change of sound absorption performance of MOAMM. Results show that the sound absorption coefficient of MOAMM maintains over 0.8 when facing with sound waves from different direction, and the frequency range changes with the entrance width, channel width and cell size. Experimental results have verified the excellent performance of the proposed structure, which provides new approaches for effective control of sound radiation.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Auto-encoder-based inverse characterization of Transport properties of acoustic foams","authors":"Jianglong Chen ,&nbsp;Yiqin Xu ,&nbsp;Xiaoliang Zhao ,&nbsp;Menghe Miao ,&nbsp;Jiaguang Meng ,&nbsp;Lingjie Yu ,&nbsp;Chao Zhi","doi":"10.1016/j.apacoust.2024.110346","DOIUrl":"10.1016/j.apacoust.2024.110346","url":null,"abstract":"<div><div>The characterization of non-acoustic parameters is critically important for understanding the acoustic property and structural design of polyurethane (PU) foams. However, inverse characterization of acoustic PU foams through experiments and simulations often results in prolonged cycles and high resource wastage. To address the above issue, an innovative approach based on the Auto-encoder (AE) was proposed in this paper. In the AE approach, the decoder module was utilized for the forward prediction part, while the encoder was used for the inverse characterization. A sample database of 96,730 data sets covering PU foams’ sound absorption coefficients at 500–6000 Hz was established to train the AE model. To verify the effectiveness of the trained model, a comparative experiment with numerical simulations was firstly conducted. The results revealed that the coefficient of determination (<em>R</em>²) of forward prediction module surpasses 0.99, while the prediction time is significantly rapid, averaging 0.0005 s per sample, which is 1/22,000 of numerical simulation time. Another comparative experiment was conducted between the inverse characterization results of the machine learning model and the experimental data from real samples. The results showed that the average error of the characterization parameters (non-acoustic parameters and material thickness) is about 8.70 %. In summary, this study provides an intelligent inverse characterization method for targeted sound absorption of PU foams, with potential extensions to the inverse characterization of other acoustic porous materials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Enhanced motorcycle safety through the development and evaluation of auditory alert system","authors":"Serkan Atamer ,&nbsp;Robert Rosenkranz ,&nbsp;Colin J. Ballantyne ,&nbsp;Alina Kuttler ,&nbsp;M. Ercan Altinsoy","doi":"10.1016/j.apacoust.2024.110328","DOIUrl":"10.1016/j.apacoust.2024.110328","url":null,"abstract":"<div><div>Motorcyclists are often in dangerous situations in traffic. Timely warnings can be crucial in preventing accidents. Currently, warning messages are limited to dashboard displays, which may have potential inefficiencies as riders might not consistently check them, particularly in urgent situations demanding immediate response. While modern cars typically feature various auditory alert systems, such as open doors or parking sensors, the utilization of sound for such purposes in motorcycles has been rather limited. Hence, developing clear, easy-to-understand acoustic warning signals tailored for common warning scenarios becomes crucial for motorcyclist safety. This study defines the design constraints for a potential auditory alert system, considering factors like ambient noise and helmet audio system characteristics Afterwards, a set of warning tones, designed for five different directions and two different urgency cases, accommodating these limitations, was validated through psychoacoustical evaluations. All tested sounds adeptly alerted participants without causing elevated annoyance. Recognition times aligned with typical attentive driver reactions, with possible learning effects observed over repeated exposures. While a 100% correctness rate without situational context was not anticipated, directional correctness showed significant potential, emphasizing the importance of diverse design alternatives. Learning effects, particularly if widely adopted, could lead to instinctive reactions crucial in critical driving situations. At the end, the defined design space allows for the evaluation of different warning tones, promoting the exploration of optimal solutions for motorcyclist safety.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Virtual quiet zone method for sound zone reproduction in coupled rooms","authors":"Xiaoyi Gao ,&nbsp;Qiaoxi Zhu ,&nbsp;Xiangning Liao ,&nbsp;Ming Wu ,&nbsp;Lu Han ,&nbsp;Jun Yang","doi":"10.1016/j.apacoust.2024.110341","DOIUrl":"10.1016/j.apacoust.2024.110341","url":null,"abstract":"<div><div>Sound zone reproduction aims to deliver sound to target listeners in the listening zone while reducing unwanted sound for others in the quiet zone. Existing approaches primarily focus on reproducing sound zones within a single room. When employing existing methods in coupled spaces, the accurate measurement of cross-room acoustic transfer functions (ATFs) poses significant challenges. This paper proposes a virtual quiet zone method to improve sound zone performance in coupled rooms. The proposed method eliminates the need for complex cross-room ATF measurement. We use the Improved Grey Wolf Optimizer to establish an appropriate virtual quiet zone within the virtual space based on the measured sound pressures at the zones. The ATFs between the loudspeakers and the virtual quiet zone can be interpolated utilizing acoustic modeling and the measured ATFs between the loudspeakers and the listening zone. In the proposed algorithm, the optimization of sound zone reproduction in coupled rooms is transformed into the optimization of the position of the virtual quiet zone within the virtual space. Experimental results show that the proposed method outperforms the current acoustic contrast control method and brightness control method in real-world implementations in coupled rooms.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}