Applied Acoustics最新文献

{"title":"Acoustic source detection and localization using generalized likelihood ratio test in the spherical harmonic domain","authors":"Dhiya Eddine Rabia Oulahcine ,&nbsp;Mustapha Benssalah ,&nbsp;Nabil Haddad ,&nbsp;Daniele Salvati ,&nbsp;Osama Mahfoudia","doi":"10.1016/j.apacoust.2024.110434","DOIUrl":"10.1016/j.apacoust.2024.110434","url":null,"abstract":"<div><div>In recent years, spherical microphone arrays have gained significant attention for analyzing acoustic signals due to their consistent spatial resolution in both elevation and azimuth, added to the ability to transform signals into the spherical harmonics domain. This paper deals with the localization of active sound sources in the presence of noisy and silent recordings. In the literature, the aspects of detection and localization of acoustic signals are often addressed separately. However, the present paper proposes the spherical harmonic generalized likelihood ratio test (SH-GLRT) algorithm which concurrently addresses both aspects while maintaining a fixed false-alarm probability (Pfa). In this context, the acoustic source localization is considered as a detection problem, and the necessary mathematical development is provided. Precisely, the resulting detection thresholds for four spherical harmonics orders are considered, and the detection performance is assessed and compared to the state-of-the-art methods. In addition, the LOCATA challenge dataset is employed for validation, which emphasizes the efficiency of the proposed method.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110434"},"PeriodicalIF":3.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759573","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":"Pressure ripple attenuation performance prediction and analysis of a pressurised bladder-type hydraulic noise attenuator","authors":"Zhipeng Liu ,&nbsp;Hesheng Tang ,&nbsp;Yan Ren ,&nbsp;Jiawei Xiang ,&nbsp;Kumar Anil","doi":"10.1016/j.apacoust.2024.110444","DOIUrl":"10.1016/j.apacoust.2024.110444","url":null,"abstract":"<div><div>The pressure ripple attenuation performance (PRAP) of a pressurised bladder-type hydraulic noise attenuator (bladder attenuator) is investigated in this study based on mathematical model using the transfer matrix method and equations of state for an ideal gas and liquid. Transmission loss (TL) was selected as the metric for evaluating the PRAP of the bladder attenuator. The study investigated the impact of the ratio of the precharge gas pressure to the system pressure, bulk modulus and kinematic viscosity of the hydraulic oil, and structural dimensions of the perforated tube on the PRAP. The key findings are summarised as follows: First, the applicability of the mathematical model was validated using previously published methods and experimental data. Second, the ratio of the precharge gas pressure to the system pressure emerged as a crucial factor influencing the PRAP, particularly when the precharge gas pressure was lower than the system pressure. Finally, the bulk modulus and kinematic viscosity of the hydraulic oil demonstrated minimal effects on the PRAP, whereas increasing the inner radius and number of through-holes in the perforated tube was found to effectively enhance the PRAP.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110444"},"PeriodicalIF":3.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759579","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":"The de-icing method using synthesized envelope modulation signals from resonance low-frequency and ultrasonic signals","authors":"Peiyi Xu ,&nbsp;Donglai Zhang ,&nbsp;Anshou Li","doi":"10.1016/j.apacoust.2024.110411","DOIUrl":"10.1016/j.apacoust.2024.110411","url":null,"abstract":"<div><div>This paper proposes a method of combining low-frequency resonance signals and ultrasonic signals through envelope modulation to form an excitation signal for de-icing. Modulated signals are applied to a single type of actuator for de-icing, aiming to simplify the equipment required for de-icing and reduce power consumption. The envelope modulation signal is generated by combining low-frequency signals with ultrasonic signals using amplitude modulation, the Hamming window function, and the Hanning window function, respectively. The de-icing excitation effects of the modulation signals generated by different modulation methods at various initial phases on the ice-covered leading edge of the blade are calculated through numerical simulations. Simulations show that the modulation method and initial phase have a significant impact on the de-icing excitation effect. Experiments are conducted to explore the de-icing effectiveness and power consumption under different envelope modulation signal excitations. The results indicate that the envelope modulation signal de-icing method can simplify equipment and reduce power consumption, showing promising development and application prospects.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110411"},"PeriodicalIF":3.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759741","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":"Recursive prototypical network with coordinate attention: A model for few-shot cross-condition bearing fault diagnosis","authors":"Yonghua Jiang ,&nbsp;Zengjie Qiu ,&nbsp;Linjie Zheng ,&nbsp;Zhilin Dong ,&nbsp;Weidong Jiao ,&nbsp;Chao Tang ,&nbsp;Jianfeng Sun ,&nbsp;Zhongyi Xuan","doi":"10.1016/j.apacoust.2024.110442","DOIUrl":"10.1016/j.apacoust.2024.110442","url":null,"abstract":"<div><div>In a practical industrial scenario, the variability in bearing operating conditions complicates the collection of a sufficient number of labeled samples, thereby limiting the effectiveness of traditional deep learning-based fault diagnosis methods. In addition, the influence of abnormal samples on the prototype features also severely limits the performance of prototypical network in few-shot fault diagnosis. To address the above issues, a recursive prototypical network based on <em>meta</em>-learning is proposed for few-shot cross-condition bearing fault diagnosis. Firstly, a feature extractor with coordinate attention mechanism is developed, which is able to deeply extract effective features in complex vibration signals. Furthermore, a recursive prototype computation module is introduced to alleviate prototype bias arising from abnormal samples, thereby achieving a more precise representation of prototypes. Finally, a metric module is utilized to obtain the similarity between the prototypes and the query set samples to achieve an accurate classification of faults. To verify the efficacy and superiority of the proposed method, its performance was evaluated on two bearing vibration datasets. The experimental results demonstrated that the method is significantly better than other deep learning methods with high accuracy and generalization, and greater suitability for few-shot cross-condition bearing fault diagnosis tasks.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110442"},"PeriodicalIF":3.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748637","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":"Deflecting incident flexural waves in a cylindrical shell metasurface","authors":"Jialin Wu,&nbsp;Lingyun Yao","doi":"10.1016/j.apacoust.2024.110436","DOIUrl":"10.1016/j.apacoust.2024.110436","url":null,"abstract":"<div><div>Nowadays, most research in metasurfaces focuses on flat plates, while curved plates widely used in engineering structures and lack sufficient corresponding research on elastic wave propagation mechanisms. In this paper, transmission properties of incident flexural waves in cylindrical shell metasurface with different curvatures are researched, and the flexural wave modulation is accomplished by accumulation of specific phase shifts. To start with, the metasurfaces cell model composed of curved cylinder is constructed in subwavelength range, the transmittance and phase of flexural wave at different curvatures were analyzed by using finite element method. Then, the supercells with special geometric dimensions are selected to combine into a complete cylindrical shell metasurfaces according to the generalized Shell law, and the approximate deflection formulas of flexural waves with different curvatures are obtained by curve fitting. Finally, the accuracy of incident flexural wave modulation is verified by the comparative results of simulation and experiment. The results show that there is a special functional relationship between curvature and phase, the deflection angle of flexural wave on metasurface is similar to the predicted values. From this paper, it is known that the change of phase shift decreases with the increase of curvature, the above formulas can not only be used for cylindrical shells with different curvatures, but also ensures high transmittance and full phase control. Therefore, this work may have a wide range of potential applications in the fields of vibration control, ultrasonic guidance, energy collection and sound stealth.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110436"},"PeriodicalIF":3.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748636","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":"Research on the performance of frequency tracking methods for the ultrasonic machining system considering the influence of impedance matching unit","authors":"Zhenyan Duan,&nbsp;Tao Chen,&nbsp;Yuhao Suo,&nbsp;Xingzhou Pan,&nbsp;Xinlong Pan","doi":"10.1016/j.apacoust.2024.110439","DOIUrl":"10.1016/j.apacoust.2024.110439","url":null,"abstract":"<div><div>In power ultrasonic systems, impedance matching is a critical technique which enables electrical energy to be fully utilized by the transducer. However, the electrical parameters of the transducer will change when thermal-force loads are applied in the application scenario. Although the transducer can be operated at the optimum frequency point by using resonance frequency tracking (RFT), there is a certain tracking error when tracking the resonant frequency of the transducer in the loaded condition due to the impedance matching unit. To improve the RFT accuracy and the stability of the ultrasonic system, an ultrasonic system with RFT function was designed in this research. Then four commonly used matching topologies were introduced. Secondly, the electrical parameter drift patterns of the ultrasonic device were explored. Based on the patterns, the impedance characteristics of the transducer with four matching topologies after being loaded were revealed. Finally, the theory and experiments were combined to reveal the influence of matching topology and loading effect on the output characteristics of the transducer. The results showed that the <em>Ls</em> and <em>LCL</em> topologies have better resistance to load fluctuation. Meanwhile, after <em>Ls</em> and <em>LCL</em> matching, the phase-locked loop method still has good RFT performance under heavy load conditions. This study can guide the selection of the transducer’s matching topology and RFT methods.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"231 ","pages":"Article 110439"},"PeriodicalIF":3.4,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757230","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":"Auditory and mental well-being of teachers in urban noise environment: A partial least square structural equation model approach","authors":"Avnish Shukla ,&nbsp;Bhaven N. Tandel ,&nbsp;Parul P. Kajaliya","doi":"10.1016/j.apacoust.2024.110417","DOIUrl":"10.1016/j.apacoust.2024.110417","url":null,"abstract":"<div><div>Urban noise pollution significantly impacts public health, particularly affecting those in constant exposure, such as schoolteachers in urban areas. This study addresses the critical gap in understanding how persistent traffic noise impacts teachers’ auditory and mental health, a key concern given their essential role in educational outcomes. The necessity of this research is underscored by the potential for noise-induced disturbances to impair teaching effectiveness and teachers’ quality of life. The research question investigates the specific auditory and mental health outcomes for teachers working in noise-polluted environments. The study quantitatively measures hearing acuity and assesses mental well-being among teachers in five urban schools adjacent to high-traffic areas using audiometric assessments and a socio-acoustic questionnaire. Findings indicate a varied degree of noise-induced hearing loss (NIHL), with 36% of the participants exhibiting mild while 8% showing moderate hearing loss. The obtained value of hearing handicap ranges from 2.1 to 14.4%. However, these results for hearing handicaps were found to be less significant, indicating the non-considerable impact of classroom noise on the auditory health of teachers. Furthermore, through exploratory factor analysis (EFA) and principal component analysis (PCA), five critical factors impacting teachers’ well-being were identified: Physiological Impact, Acoustics, Ambient Environment, Social Awareness, and Mental Well-being. Subsequent analysis using Partial Least Squares Structural Equation Modeling (PLS-SEM) revealed that physiological impact and classroom acoustics, with path coefficients of 0.45 and 0.28, respectively, exerted a substantial and decisive influence on the mental well-being of schoolteachers, highlighting the critical role of environmental factors in shaping their psychological health. These insights underscore the pressing need for immediate interventions in school design and urban planning to effectively reduce noise pollution and protect the well-being of teachers.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"230 ","pages":"Article 110417"},"PeriodicalIF":3.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745944","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":"Distortion reduction of length-limited sound beam generated by parametric acoustic array","authors":"Hideyuki Nomura,&nbsp;Toi Nakagawa","doi":"10.1016/j.apacoust.2024.110425","DOIUrl":"10.1016/j.apacoust.2024.110425","url":null,"abstract":"<div><div>Length-limited sound beams (LLSBs) generated by amplitude- and phase-controlled parametric acoustic arrays with different carrier frequencies (DCFs) are low-frequency directional sound beams with controlled lengths that transmit acoustic information in a specific direction near the sound source. However, a conventional LLSB produces significant distortion, which is caused by intermodulation of multiple primary and secondary waves. This study aims to reduce the distortion of LLSBs by using a pair of parametric arrays with the same carrier frequency (SCF). To verify the effectiveness of an SCF-type emitter, the beam profiles and distortion of the demodulated sound of SCF-type LLSBs were investigated theoretically and experimentally. The results show that adopting the SCF produced LLSBs without a significant sound pressure reduction near the sound source, similar to DCF-type LLSBs. Furthermore, compared to the distortion of the demodulated parametric signal for the DCF-type LLSB, that for the SCF-type LLSB was reduced by several tens of decibels. These results suggest that SCF-type LLSBs effectively present acoustic information with low distortion to the local area.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"230 ","pages":"Article 110425"},"PeriodicalIF":3.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745946","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":"Research on the characterization of reinforced concrete corrosion based on nonlinear coda wave interferometry","authors":"Hongwei Hu ,&nbsp;Zilong Huang ,&nbsp;Chenglong Yang ,&nbsp;Xianghong Wang ,&nbsp;Wenzheng Liu","doi":"10.1016/j.apacoust.2024.110427","DOIUrl":"10.1016/j.apacoust.2024.110427","url":null,"abstract":"<div><div>Reinforced concrete (RC) structures constructed in harsh environments are prone to corrosion, inducing a shorter lifespan. It is particularly important to monitor the RC corrosion in order to eliminate safety hazards. A novel method based on the nonlinear coda wave interferometry (NCWI) technique is proposed in the paper for the characterization of corrosion in reinforced concrete (RC) structures. By establishing the RC rapid corrosion experimental system, the variations of coda wave eigenvalues (Δ<em>v/v</em> and <em>K_d</em>) with the amplitude of the pump wave in RC samples are studied. The results show that: Δ<em>v/v</em> exhibits a strong linear relationship with the pump wave amplitude, while <em>K_d</em> shows a quadratic correlation with the pump wave amplitude in the corroded sample; NCWI can distinguish the corroded and intact RC samples efficiently. This study is expected to contribute to the advancement of ultrasonic testing techniques and the monitoring of reinforced concrete (RC) corrosion.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"230 ","pages":"Article 110427"},"PeriodicalIF":3.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746120","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":"MSDFEN: Multi-scale dynamic feature extraction network for pathological voice detection","authors":"Zhiyuan Dai,&nbsp;Yuyang Jiang,&nbsp;Laiyuan Cao,&nbsp;Xiaojun Zhang,&nbsp;Zhi Tao","doi":"10.1016/j.apacoust.2024.110438","DOIUrl":"10.1016/j.apacoust.2024.110438","url":null,"abstract":"<div><div>With the rapid development of deep learning methods, their application in pathological voice detection has become increasingly extensive, yielding promising results. However, most deep learning methods used in pathological voice detection employ network architectures where all constituent modules are static, performing the same operations on all inputs. This significantly limits the model’s adaptive capacity and generalization ability and restricts further improvement in model performance. To address this issue, this paper proposes a novel pathological voice detection system called the Multi-Scale Dynamic Feature Extraction Network (MSDFEN), designed to enhance the performance and adaptive capability of pathological voice detection systems. In the MSDFEN model, sinc filter banks combined with a channel attention mechanism were employed for the preprocessing of vocal signals, effectively capturing the high-frequency transitions characteristic of pathological voices. Furthermore, dynamic blocks, consisting of multiple dynamic components, were designed and integrated into a multi-scale convolutional neural network, significantly enhancing the network’s dynamic performance and enriching the features obtained through multi-scale fusion. Comparative experiments and ablation studies were conducted using three internationally recognized pathological voice detection databases: MEEI, SVD, and HUPA. the proposed model achieved recognition accuracies of 0.9883, 0.7424, and 0.8409 in these databases, and other parameters also yielded satisfactory results. Experimental results indicate that the proposed method exhibits excellent adaptive and generalization capabilities in pathological voice detection.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"230 ","pages":"Article 110438"},"PeriodicalIF":3.4,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745945","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}