This is our latest selection of worldwide publications and patents in english on Acoustics, between many scientific online journals, classified and focused on acoustic, sound waves, acoustic absorption, sound pressure, acoustic impedance, frequency response, reverberation, waveform and Doppler.
A Symbol Conditional Entropy-Based Method for Incipient Cavitation Prediction in Hydraulic Turbines
Published on 2025-03-11 by Mengge Lv, Feng Li, Yi Wang, Tianzhen Wang, Demba Diallo, Xiaohang Wang @MDPI
Abstract: The accurate prediction of incipient cavitation is of great significance for ensuring the stable operation of hydraulic turbines. Hydroacoustic signals contain essential information about the turbine’s operating state. Considering that traditional entropy methods are easily affected by environmental noise when the state pattern is chaotic, leading to the extracted cavitation features not being obvious, a Symbol Conditional Entropy (SCE) feature extraction method is proposed to clas[...]
Our summary: Symbol Conditional Entropy method proposed for incipient cavitation prediction in hydraulic turbines using hydroacoustic signals. Improved fault information extraction and trend prediction with reduced uncertainty. Validation with RMSE, MAE, and MAPE showing superior performance compared to traditional methods.
Conditional Entropy, Incipient Cavitation, Hydraulic Turbines, Feature Extraction
Publication
A Review of Wafer-Level Packaging Technology for SAW and BAW Filters
Published on 2025-03-11 by Xinyue Liu, Wenjiao Pei, Jin Zhao, Rongbin Xu, Yi Zhong, Daquan Yu @MDPI
Abstract: This paper presents a comprehensive review of advancements in wafer-level packaging (WLP) technology, with a particular focus on its application in surface acoustic wave (SAW) and bulk acoustic wave (BAW) filters. As wireless communication systems continue to evolve, there is an increasing demand for higher performance and miniaturization, which has made acoustic wave devices—especially SAW and BAW filters—crucial components in the Radio Frequency (RF) front-end syste[...]
Our summary: This paper reviews advancements in wafer-level packaging technology for SAW and BAW filters, focusing on miniaturization and enhanced functionality. It explores novel materials, innovative structures, and advanced modeling techniques enabling the creation of multi-functional devices with low manufacturing costs. Future directions in next-generation wireless communication standards are also discussed.
wafer-level packaging, SAW filters, BAW filters, advancements
Publication
Design of a High Coupling SAW Resonator Based on an Al/41° Y-X LiNbO3/SiO2/poly-Si/Si Structure for Wideband Filter
Published on 2025-03-11 by Xiaoyu Wang, Yang Chang, Qiaozhen Zhang, Luyao Liu, Xinyi Wang, Haodong Wu @MDPI
Abstract: With the rapid development of fifth-generation (5G) mobile communication technology, the performance requirements for radio frequency front-end surface acoustic wave (SAW) devices have become increasingly stringent. Surface acoustic wave devices on piezoelectric thin film-based layered structures with high electromechanical coupling coefficients and low-frequency temperature compensation characteristics have emerged as a key solution. In this work, a SAW resonator based on an Al/41° [...]
Our summary: Design of a high coupling SAW resonator based on an Al/41° Y-X LiNbO3/SiO2/poly-Si/Si structure for wideband filter, Analysis of optimal parameters for multi-layered structure, Experimental validation of proposed resonator for high-performance SAW filter.
SAW Resonator, Al/41° Y-X LiNbO3, FEM modeling, Wideband Filter
Publication
Improved Variational Mode Decomposition in Pipeline Leakage Detection at the Oil Gas Chemical Terminals Based on Distributed Optical Fiber Acoustic Sensing System
Published on 2025-03-10 by Hongxuan Xu, Jiancun Zuo, Teng Wang @MDPI
Abstract: Leakage in oil and gas transportation pipelines is a critical issue that often leads to severe hazardous accidents at oil and gas chemical terminals, resulting in devastating consequences such as ocean environmental pollution, significant property damage, and personal injuries. To mitigate these risks, timely detection and precise localization of pipeline leaks are of paramount importance. This paper employs a distributed fiber optic sensing system to collect pipeline leakage signals and process[...]
Our summary: Improved VMD algorithm with automatic parameter optimization and fuzzy dispersion entropy for enhanced denoising performance. Novel threshold setting technique reduces false alarm rate in gas pipeline leakage detection, improving accuracy and reliability. Valuable tool for enhancing safety and efficiency of oil and gas transportation systems.
Variational Mode Decomposition, Pipeline Leakage Detection, Distributed Optical Fiber Acoustic Sensing System, Particle Swarm Optimization
Publication
Vertical Distribution Characteristics of Sound Field Spectrum Splitting for Moving Sound Source in SOFAR Channel
Published on 2025-03-10 by Zuoxiang Zhang, Jinrong Wu, Zhifei Fang, Yunfei Li @MDPI
Abstract: The frequency shift of multipath sound rays induced by the motion of a sound source in an ocean waveguide environment is a crucial factor affecting the detection capabilities of both active and passive sonar systems, as well as the quality of underwater communication. Therefore, investigating the sound field characteristics of a moving sound source in the SOFAR channel is of significant importance. By comparing the spectra of continuous-wave (CW) signals with pulse widths of 1 s and 15 s receive[...]
Our summary: Investigation of vertical distribution characteristics of sound field spectrum splitting for moving sound source in SOFAR channel. Identification of frequency shift bright lines and sound ray paths. Development of multipath sound ray frequency shift calculation model.
sound field spectrum, vertical distribution, SOFAR channel, moving sound source
Publication
A Lightweight Time Synchronization Scheme for High-Speed Mobile Underwater Acoustic Sensor Networks
Published on 2025-03-10 by Chenyu Zhang, Huabing Wu @MDPI
Abstract: Time synchronization is a crucial element of cooperativity among underwater acoustic sensor networks (UWASNs), and it plays an indispensable role in the application of and research into UWASNs. Although plenty of previous studies on time synchronization for UWASNs have been proposed and applied, most of them cannot perform well when the nodes have high mobility, and they are characterized by low energy efficiency. Tri-Message is a scheme proposed for networks in high-latency and resource-constra[...]
Our summary: Lightweight time synchronization scheme for high-speed mobile UWASNs, Doppler-shift-estimating method for propagation delay, Underwater spread-spectrum method for signal receiving, High energy efficiency.
Time synchronization, Lightweight, High-speed, Underwater Acoustic Sensor Networks
Publication
Catheter system with multiple energy sources
Patent published on the 2025-03-06 in WO under Ref WO2025049683 by SHOCKWAVE MEDICAL INC [US] (Hasenberg Thomas Charles [us], Peng Steven Yihlih [us], Stephens Patrick [us])
Abstract: A catheter system for treating stenosis in a body lumen includes a first energy source, a second energy source, and a catheter. The catheter includes an elongate member that is navigable through the body lumen, a first acoustic energy emitter connected to the first energy source and configured to emit acoustic energy when energy is received from the first energy source, and a second acoustic energy emitter connected to the second energy source and configured to emit acoustic energy when energy i[...]
Our summary: A catheter system with multiple energy sources for treating stenosis in a body lumen, including first and second acoustic energy emitters connected to different energy sources.
catheter system, multiple energy sources, stenosis treatment, acoustic energy
Patent
Method for non-destructive acoustic testing of ceramic post insulators
Patent published on the 2025-03-06 in WO under Ref WO2025048672 by OBSHCHESTVO S OGRANICHENNOJ OTVETSTVENNOSTJU NAUCHNO PROIZVODSTVENNOE OBEDINENIE LOGOTEKH [RU] (Tukachyov Ivan Grigor'evich [ru], Komar Sergej Sergeevich [ru])
Abstract: A method for the non-destructive acoustic testing of the mechanical strength of a ceramic post insulator includes exciting natural vibrations in an insulator, converting the natural vibrations into an electrical signal, recording said signal on a machine-readable carrier, calculating the energy spectrum of the signal in the tested frequency band, and checking that the calculated energy spectrum meets set diagnostic criteria. The insulator is declared fit for use if the maximum value of the energ[...]
Our summary: Method for non-destructive acoustic testing of ceramic post insulators includes exciting natural vibrations, converting vibrations into electrical signal, calculating energy spectrum, and checking against diagnostic criteria to determine fitness for use. Reduces error probability in assessing insulator condition.
acoustic testing, ceramic post insulators, non-destructive, mechanical strength
Patent
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