Acoustics MDPI

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💡 Broadband Acoustic Modal Identification by Combined Sensor Array Measurements
🧑‍🎓 by Kunbo Xu and colleagues

This research presents a synchronous measurement method for broadband acoustic modal identification using a combined microphone array, addressing the issue of acoustic modal aliasing with fewer microphones. The method enhances testing efficiency in identifying circumferential and radial modes and is validated through numerical simulations and experiments on an axial flow compressor, demonstrating its effectiveness in noise reduction evaluations.

📌 Read more: https://brnw.ch/21x5e3w

Broadband Acoustic Modal Identification by Combined Sensor Array Measurements This paper proposes a synchronous measurement method for broadband acoustic modal identification based on a combined microphone array, which is capable of overcoming the acoustic modal aliasing issue arising from a limited number of microphones. In the proposed method, the cross-correlation combinat...

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💡 Applicability of Traditional Acoustic Technology for Underwater Archeology: A Case Study of Model Detection in Xiamen Bay
🧑‍🎓 by Xudong Fang and colleagues

This study addresses the applicability of conventional marine acoustic technologies for detecting non-metal artifacts. Based on the typical environment in Xiamen Bay, we evaluated the detection efficacy of common multibeam sonar, side-scan sonar, and sub-bottom profiling sonar through a controlled model experiment system. We employed ceramic artifact replicas (ranging in size from 10 to 70 cm) and incorporated acoustic parameter optimization to elucidate the applicability boundaries of different technologies.

📌 Read more: https://brnw.ch/21x5bXp

Applicability of Traditional Acoustic Technology for Underwater Archeology: A Case Study of Model Detection in Xiamen Bay This study addresses the applicability of conventional marine acoustic technologies for detecting non-metal artifacts. Based on the typical environment in Xiamen Bay, we evaluated the detection efficacy of common multibeam sonar, side-scan sonar, and sub-bottom profiling sonar through a controlled m...

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💡 Advancements in Super-High Frequency Al(Sc)N BAW Resonators for 5G and Beyond
🧑‍🎓 by Chen Li and colleagues

This review provides a comprehensive overview of the recent advances in SHF Al(Sc)N bulk acoustic wave (BAW) resonators. It systematically discusses the device design methodologies, structural configurations, and material synthesis techniques for high-quality Al(Sc)N thin films.

📌 Read more: https://brnw.ch/21x5acX

Advancements in Super-High Frequency Al(Sc)N BAW Resonators for 5G and Beyond With the booming development of the 5G market in recent years, super-high frequency (SHF) resonators will play an increasingly critical role in 5G and future communication systems. Facing the growing market demand for miniaturized, high-bandwidth, and low insertion loss filters, the design of SHF re...

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💡 B-Scan Imaging and 3D Visualization of Hardened Layer Depth Profile in Linear Guide Rails Based on Ultrasonic Shear Wave Backscattering Technique
🧑‍🎓 by Peiqiang Chen and colleagues

In order to measure the depth profile of the heat-treated case-hardened layer of linear guides, this paper proposes a B-scan imaging and 3D visualization method for detecting the depth profile of the case-hardened layer of linear guides based on the ultrasonic transverse wave backscattering technology.

📌 Read more: https://brnw.ch/21x56Xt

B-Scan Imaging and 3D Visualization of Hardened Layer Depth Profile in Linear Guide Rails Based on Ultrasonic Shear Wave Backscattering Technique In order to measure the depth profile of the heat-treated case-hardened layer of linear guides, this paper proposes a B-scan imaging and 3D visualization method for detecting the depth profile of the case-hardened layer of linear guides based on the ultrasonic transverse wave backscattering technolo...

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💡 A Finite Element Modeling Approach for Assessing Noise Reduction in the Passenger Cabin of the Piaggio P.180 Aircraft †
🧑‍🎓 by Carmen Brancaccio and colleagues

Passenger comfort in executive-class aircraft demands rigorous control of noise, vibration, and harshness. This study describes the development of a detailed, high-fidelity coupled structural–acoustic finite element model of the Piaggio P.180 passenger cabin, aimed at accurately predicting interior cabin noise within the low- to mid-frequency range.

📌 Read more: https://brnw.ch/21x54Lz

A Finite Element Modeling Approach for Assessing Noise Reduction in the Passenger Cabin of the Piaggio P.180 Aircraft Passenger comfort in executive-class aircraft demands rigorous control of noise, vibration, and harshness. This study describes the development of a detailed, high-fidelity coupled structural–acoustic finite element model of the Piaggio P.180 passenger cabin, aimed at accurately predicting interio...

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💡 An Impedance Model for Angle-Dependent Sound Reflection and Absorption with Diffraction Effects
🧑‍🎓 by Jens Holger Rindel

The research presents an impedance model for analyzing sound reflection and absorption at an aperture, revealing that the sound absorption coefficient of an open window is angle-dependent and decreases at low frequencies. It identifies two diffraction effects—refraction and scattering—and introduces a revised model that accounts for these effects, validating it against measured sound absorption data. The study also discusses implications for room acoustic calculation models.

📌 Read more: https://brnw.ch/21x4ZpL

An Impedance Model for Angle-Dependent Sound Reflection and Absorption with Diffraction Effects Traditionally, an open window is considered a kind of reference for perfect sound absorption. The sound reflection and absorption of an aperture is analyzed by means of an impedance model representing a rectangular absorbing surface surrounded by a thin, infinite rigid baffle. The most important par...

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💡 Robust Blind Algorithm for DOA Estimation Using TDOA Consensus
🧑‍🎓 by Danilo Greco (Politecnico di Milano)

This paper presents a robust blind algorithm for direction of arrival (DOA) estimation that utilizes a novel Time Difference of Arrival (TDOA) consensus framework to effectively filter outliers and enhance performance in challenging acoustic environments. The algorithm demonstrates significant improvements in DOA estimation accuracy, achieving up to 30% reduction in root mean square error compared to traditional methods, particularly in noisy and reverberant conditions, while maintaining feasibility for real-time applications without prior knowledge of the acoustic environment.

📌 Read more: https://brnw.ch/21x4K7J

Robust Blind Algorithm for DOA Estimation Using TDOA Consensus This paper proposes a robust blind algorithm for direction of arrival (DOA) estimation in challenging acoustic environments. The method introduces a novel Time Difference of Arrival (TDOA) consensus framework that effectively identifies and filters outliers using Median and Median Absolute Deviation...

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💡 Sound Absorption Properties of Waste Pomelo Peel
🧑‍🎓 by Lihua Lyu and colleagues

The research investigates the sound absorption properties of waste pomelo peel, revealing its porous structure enhances sound absorption performance. By optimizing various factors in the preparation of waste pomelo peel/polycaprolactone composites, the study achieves a maximum sound absorption coefficient of 0.99, indicating significant potential for resource recycling and noise pollution reduction.

📌 Read more: https://brnw.ch/21x4J6e

Sound Absorption Properties of Waste Pomelo Peel To solve the issue of environmental noise pollution and promote the resource recycling of waste pomelo peel, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) are used to systematically characterize the microstructure and chemical compos...

Heading to Bruges this August?

MDPI will be exhibiting at the 34th European Signal Processing Conference (EUSIPCO 2026) from 31 August to 4 September 2026.

EUSIPCO is a premier forum for researchers and professionals in signal processing to exchange ideas, showcase innovations, and build meaningful collaborations.

Visit the MDPI booth to meet our team, discover our journals, and learn more about our open access publishing initiatives. We look forward to engaging with the community and discussing the latest developments in signal processing.

📅 31 August–4 September 2026
📍 Bruges, Belgium
🔗 https://brnw.ch/21x4A2C

See you at !

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💡 Transient Vibro-Acoustic Characteristics of Double-Layered Stiffened Cylindrical Shells
🧑‍🎓 by Qirui Luo and colleagues

This study investigates the underwater transient vibro-acoustic response of double-layered stiffened cylindrical shells through an integrated experimental-numerical approach.

📌 Read more: https://brnw.ch/21x4vuL

Transient Vibro-Acoustic Characteristics of Double-Layered Stiffened Cylindrical Shells This study investigates the underwater transient vibro-acoustic response of double-layered stiffened cylindrical shells through an integrated experimental-numerical approach. Initially, vibration and noise responses under transient impact loads were experimentally characterized in an anechoic water ...