Applied Acoustics最新文献

英文中文

Experimental Investigations on the Interplay between a thermoacoustic oscillator and an external acoustic driver with different waveforms

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-18 DOI: 10.1016/j.apacoust.2025.110678

Shancheng Tao , Liu Liu , Zhaoyu Li , Lihua Tang , Zhibin Yu , Geng Chen

Recent studies have reported on the various nonlinear behaviors (e.g., synchronization) resulting from the mutual interaction between a thermoacoustic oscillator and an external acoustic driver producing sinusoidal waves. This work extends previous research by experimentally investigating the dynamic behavior of a thermoacoustic oscillator subjected to external disturbances with different waveforms including triangular and irregular waves. The experimental data are analyzed using various signal processing techniques such as Fast Fourier Transform, wavelet transform, and phase space trajectories. Results reveal that apart from sinusoidal waves, both triangular and irregular waves can be utilized to synchronize the thermoacoustic oscillator. When synchronization occurs, the oscillator will transit from initial periodic oscillations at the natural frequency to final periodic oscillations at the driving frequency. The acoustic pressure resembles the external disturbance at the open end (e.g., triangular waves) but shifts towards sinusoidal waves when approaching the closed end. It is found that synchronization can happen if the dominant frequency of the external disturbance closely aligns with the natural frequency of the oscillator, even in the presence of harmonic components. This study provides an experimental framework for investigating the dynamic behavior of thermoacoustic oscillators under external disturbances, enhancing our understanding of synchronization phenomena in thermoacoustic devices.

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引用次数: 0

Bio-inspired underwater acoustic communication through PCHIP-based whistle generation and improved CSS modulation

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-17 DOI: 10.1016/j.apacoust.2025.110673

Zhiwen Qiao , Songzuo Liu , Dexu Wang , Yipeng Xing , Tianyi Liu , Jiaxuan Li

Bio-inspired underwater acoustic communication has emerged as a promising approach for secure underwater communication by camouflaging signals as marine mammal vocalizations. However, conventional bio-inspired communication methods predominantly rely on fixed cetacean whistle patterns or limited whistle databases. The inherent predictability in signal frame structures significantly boosts their vulnerability to pattern recognition and adversarial detection. This consequently weakens the fundamental premise of bio-inspired communication systems, namely, their capacity to emulate natural marine mammal vocalizations for covert operations. To address this limitation, our research group proposed a novel bio-inspired secure communication model utilizing a piecewise cubic hermite interpolating polynomial (PCHIP) for simple whistle generation. The proposed approach ensured frequency continuity in signal design while maintaining high similarity to natural cetacean whistles. Subsequently, an improved chirp spread spectrum (CSS) modulation scheme was developed, and a PCHIP-based spread spectrum algorithm was introduced to generate random time-frequency spectral profiles. Particularly, randomly generated synchronization headers were incorporated with sliding correlation in the proposed system, enabling individual whistles to achieve both synchronization and information transmission capabilities. The integrated method significantly reinforced the covertness of bio-inspired communication while maintaining communication efficiency. The simulation results in shallow water environments demonstrated the effectiveness of our approach. Meanwhile, sea trials successfully achieved communication over 10 km distances with a bit error rate of

10^{- 4}

, validating the practical viability of the proposed system.

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引用次数: 0

Efficient speech encryption algorithm based on three-dimensional quadratic exponential robust chaos

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-17 DOI: 10.1016/j.apacoust.2025.110672

Yibo Huang , Chong Li , Zhiyong Li , Qiuyu Zhang

The computational accuracy and parameter spacing of the existing chaos result in the gradual degradation of the chaos, which makes the sequence become periodic sequence, and the divergence rate and divergence index of the existing chaos are low. In addition, the current speech encryption algorithm has high complexity and low computational efficiency. To solve these problems, a three-dimensional quadratic exponential chaos is proposed and an efficient speech encryption algorithm is designed. To solve the problem of slow numerical divergence, the double exponential nesting structure is used and the expansion factor

b e t a

is introduced to effectively reduce the number of iterations when complete chaos is reached. In order to improve the internal complexity of chaotic sequence, the whole chaotic equation is standardized, so that the generated chaotic sequence has a wide distribution. Considering that the algorithm can be stably deployed in the hardware chip in the future, and take into account the encryption rate. In this paper, the speech encryption algorithm adopts the parallel processing of confusion and diffusion, and makes the residual processing of the generated encrypted speech to improve the scrambling effect and encryption efficiency. Simulation results show that the proposed chaos equation achieves remarkable exponential divergence rate, robustness and hardware deployability. The proposed speech encryption algorithm has high efficiency, low complexity, high noise ratio, can resist a series of attacks, and has high security. This paper presents an efficient encryption strategy for speech encryption.

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引用次数: 0

Reflected sound field over microperforated panel systems

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-14 DOI: 10.1016/j.apacoust.2025.110628

Raffaele Dragonetti , Elio Di Giulio , Annunziata Bruno , Antonio Scofano , Rosario Aniello Romano

In this paper the reflected sound field over micro-perforated systems (MPPS) is investigated by using experimental, numerical and theoretical approaches. Two types of MPPS configurations are considered: one with an air cavity termination and the other with a honeycomb layer termination. A theoretical model to assess the reflected sound pressure and particles velocity fields by a microperforated panel backed by a honeycomb layer or by a simple air layer, as well as the angle of reflection, is reported. The theoretical method has been validated by means of experimental measurements in free field and numerical finite element simulations. Results highlight significant differences between MPPS in the case of honeycomb layer or when a simple air cavity is considered. Measurements performed in reverberation chamber and standing wave tube for the same micro-perforated panel have been carried out as well, allowing a further validation of the theoretical model. The latter measurements make possible, at the same time, experimentally appreciate the differences of the absorption coefficient values with and without honeycomb layer, in the case of normal, oblique and diffuse sound incidence.

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引用次数: 0

Broadband sound reduction in space-coiling ventilation structures with microperforated shells

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-14 DOI: 10.1016/j.apacoust.2025.110676

Yonghui Zhang, Lei Zhang, Youdong Duan, Xiaoming Zhou

Ventilation structures supported by the Fano-like interference can act as high-performance sound silencers, yet the bandwidth gets limited eventually by coexisting resonant transmission. In this work, we focus on the space-coiling ventilation structure, and overcome the limitation by introducing a cylindrical shell made of microperforated panels (MPPs) in between the channel and ventilation pipe. The underlying mechanism is due to the resonance-induced field intensity enhancement within coiling channels, which can produce a significant pressure difference on both sides of the MPP to damp resonant acoustic transmission. Based on this behavior, broadband sound reduction with the bandwidth exceeding an octave can be achieved when two such structural elements are cascaded. Enhanced acoustic damping by MPPs and broadband sound reduction in bi-cell structures are numerically analyzed and validated experimentally.

引用次数: 0

Asymmetric generation of broadband beam splitting using a dissipative acoustic coupler-based metamaterial

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-14 DOI: 10.1016/j.apacoust.2025.110679

Rui Wang , Shuai Tang , Jingkun Zhan , Cheng Lü , Jiabao Yao , Wencong Zhang , Jiabin Hou , Guorong Cui , Qiang Zhang

In this work, a broadband acoustic beam splitter that has an asymmetric transmission feature is proposed by constructing a dissipative acoustic coupler. The beam splitter has a simple configuration, requiring only three straight air cavities and two space-independent air slits. The dissipation just needs to be uniformly exerted into the middle cavity, and thus the complicated modulation of the loss factor is avoided. The acoustic waves incident from one-side of a certain cavity exhibit an equal-weighted intensity distribution along top and bottom cavities, while those cannot transfer back to a certain cavity when top and bottom cavities incident from the other side simultaneously. Given the excellent asymmetric wave propagating performance, a one-way acoustic mode converter is further constructed by sealing both sides of the middle cavity. The 0-order acoustic waves can be converted into 1-order acoustic waves unidirectionally in a broadband from 3.8 kHz to 10 kHz. More uniquely, an acoustic metamaterial that has an ability of asymmetric transmission is designed as well by adopting the mode converters as basic meta-atoms, through which the incident waves can split into two parts with opposite directions unidirectionally. By taking advantage of the broadband feature of the metamaterial, the angle of the splitting beam is able to be manipulated flexibly. Our work provides an effective solution for the realization of asymmetric and broadband beam splitting, which may have potential applications in numerous fields such as acoustic detection and acoustic logic operations.

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引用次数: 0

Noise assessment of expansion joints built perpendicularly and angled in the direction of traffic. Measurement method: Case study

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-13 DOI: 10.1016/j.apacoust.2025.110674

Rafał Żuchowski, Artur Nowoświat, Michał Marchacz, Marcin Górski

Although expansion joints are an essential element of bridge infrastructure, they cause huge noise problems. Expansion joints can be structured differently whilst also being able to be installed differently. This article presents a case study on expansion joints installed perpendicularly and at an angle to the direction of traffic. It appears that the installation method affects the overall level of sound produced. Differences between diagonal and perpendicular constructions in the direction of traffic reach up to 2.9 dB. This value approximately corresponds to a doubling of the level of noise. The paper also presents a Type B uncertainty assessment for a Class I acoustic metre. The separation of upper and lower bounds of uncertainty is a particularly interesting result. In doing so, it was noted that the interval in which the true value of the measurement is located is asymmetrical. In the case of a type B uncertainty analysis, an upper limit on the expanded uncertainty of

U_{B, 95}^{+} = 1.12 dB

and a lower limit of

U_{B, 95}^{-} = - 1.22 dB

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引用次数: 0

Creating personal sound zones in car cabins with active noise control

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-13 DOI: 10.1016/j.apacoust.2025.110670

Qing Xu, Shuping Wang, Jiancheng Tao, Haishan Zou, Xiaojun Qiu

Personal sound zones allow people in different zones to listen to different audio programs without using headphones. It is proposed in this paper to use the active noise control (ANC) method to create bright and dark zones in car cabins with headrest loudspeakers, and its performance is compared with the most commonly used pressure matching (PM) method. Numerical simulations based on a finite element model of a car cabin show that the ANC method can achieve similar acoustic contrast control performance to that with the PM method with fewer channels, and the adaptive algorithm has the potential to be applied in the system. The experiment results obtained in a mid-trim level A-class sedan are presented to support the findings in the simulations, and subjective experiments are carried out to evaluate the performance of these two methods.

引用次数: 0

A framework for developing adaptive acoustic comfort: Insights from expert interviews

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-11 DOI: 10.1016/j.apacoust.2025.110642

Seda Yuksel Dicle, Francesco Aletta, Jian Kang

The ability of individuals to adapt to environmental conditions, known as environmental adaptation, reflects their capacity to modify behaviors and physical surroundings to better align with external demands. In thermal comfort assessments, this adaptation process is evaluated using the adaptive thermal comfort model. Similarly, the relationship between individuals’ adaptability and their perception of acoustic environments is also considered to play a significant role in acoustic comfort assessments. Based on this foundation, this study investigates the development and assessment of an adaptive acoustic comfort model, following on its initial definition: “a model that relates indoor acoustic conditions to outdoor ones, moderated by other environmental, contextual, and personal factors.” Through expert interviews, the research aims to develop a preliminary framework for assessing adaptive acoustic comfort, highlighting the importance of environmental adaptation and user tolerance. This framework includes the identification of assessment methods, acoustic indicators, and adaptive model variables necessary for testing the model’s existence and effectiveness in acoustic evaluations. By examining acoustic comfort from an adaptive perspective, the study recommends evaluating indoor acoustic comfort in relation to outdoor conditions. To capture variability in user responses, it suggests having real-world data alongside laboratory studies using specific acoustic indicators. Additionally, the model framework emphasizes the necessity of evaluating personal, environmental, and building-related variables through various developed adaptive models.

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引用次数: 0

Acoustic observations of a prescribed burn

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics

Pub Date : 2025-03-11 DOI: 10.1016/j.apacoust.2025.110657

Omar Marcillo , Jonathan M. Lees , Kara Yedinak , Keith Bourne , Brian Potter , Steven Flanagan , Joseph O’Brien , Joseph Paki

Audible sound is known to originate from wildland fires. We show audible sound is accompanied by infrasound emissions, originating from the active combustion zone in a prescribed fire. We collected data from one of multiple prescribed burns conducted at Eglin Airforce Base, Florida in March of 2023. Single-unit infrasonic sensors and a six-element array were deployed outside the burn unit to capture acoustic signals. The array was configured as a hexagon with aperture of ∼10 m. Dual-band radiometers were deployed inside the unit to track the fire’s evolution. A broadband signal is observed by all infrasound sensors with variable intensity and frequency content between 2 Hz and up to 90 Hz. The sensor closest to the perimeter of the unit detected frequencies up to 90 Hz for a few minutes. Array analysis shows a coherent broadband signal with frequencies between 2 and 40 Hz emanating from the burn unit that we argue is sound from the active combustion zone. The estimated azimuths follow the ignition pattern with delays of several minutes between the ignition and detection of sound. We discuss the potential for using acoustic measurements to study the spatial and temporal evolution of fire and extract spectral features of vegetation type-specific heat release rates. Extracting fire characteristics and dynamics using sound may complement other more established measurements by providing continuous data remotely that are not constrained to line-of-sight or visibility conditions that can be affected by smoke or topography.

{"title":"Acoustic observations of a prescribed burn","authors":"Omar Marcillo , Jonathan M. Lees , Kara Yedinak , Keith Bourne , Brian Potter , Steven Flanagan , Joseph O’Brien , Joseph Paki","doi":"10.1016/j.apacoust.2025.110657","DOIUrl":"10.1016/j.apacoust.2025.110657","url":null,"abstract":"<div><div>Audible sound is known to originate from wildland fires. We show audible sound is accompanied by infrasound emissions, originating from the active combustion zone in a prescribed fire. We collected data from one of multiple prescribed burns conducted at Eglin Airforce Base, Florida in March of 2023. Single-unit infrasonic sensors and a six-element array were deployed outside the burn unit to capture acoustic signals. The array was configured as a hexagon with aperture of ∼10 m. Dual-band radiometers were deployed inside the unit to track the fire’s evolution. A broadband signal is observed by all infrasound sensors with variable intensity and frequency content between 2 Hz and up to 90 Hz. The sensor closest to the perimeter of the unit detected frequencies up to 90 Hz for a few minutes. Array analysis shows a coherent broadband signal with frequencies between 2 and 40 Hz emanating from the burn unit that we argue is sound from the active combustion zone. The estimated azimuths follow the ignition pattern with delays of several minutes between the ignition and detection of sound. We discuss the potential for using acoustic measurements to study the spatial and temporal evolution of fire and extract spectral features of vegetation type-specific heat release rates. Extracting fire characteristics and dynamics using sound may complement other more established measurements by providing continuous data remotely that are not constrained to line-of-sight or visibility conditions that can be affected by smoke or topography.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110657"},"PeriodicalIF":3.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593116","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}

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