Journal of Sound and Vibration最新文献_第7页

Acoustic sensing enhancement and directional acoustic localization based on nonlinear compact gradient coiled metamaterials 基于非线性紧致梯度卷曲超材料的声传感增强与定向声定位

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-29 DOI: 10.1016/j.jsv.2025.119586

Lin Geng, Xiang Kong, Jian Tang, Hui-Yang Xiao, Chun-Dong He, Yuan-Yuan Liu

Acoustic sensing has always been a research hotspot, in which how to break the detection limit is the key to research. Although the emergence of acoustic metamaterials in recent years has solved some of these problems, the current acoustic metamaterials still exhibit the issues, such as the excessive size and mismatches between wave vectors of the waveguide and surrounding media. To address these issues, a nonlinear compact gradient coiled metamaterial (NCGCM) is proposed in this paper. In the designed NCGCM structure, a nonlinear variation in air gap depth is employed to avoid the wave vector mismatch. The linear variation in the thickness of the acoustic grating ensures the grating stiffness and prevents the acoustic-solid coupling, and a linear change in air gap width reduces the heat loss. The linear variation in the thin plate length of the air gap can improve the refractive index to ensure the acoustic enhancement effect. The acoustic simulation of the NCGCM structure is modeled in the Comsol software. The simulation results verified that the NCGCM structure has the good frequency selectivity, acoustic enhancement effect and the good directional response ability. It can effectively identify and capture weak harmonic signals and Gaussian pulse signals. The NCGCM structure provides a new idea for the detection of weak acoustic signals and the directional acoustic localization. The designed NCGCM structure is fabricated in its entirety by 3D printing using photosensitive resin material, and an experiment is employed to further validate its capability.

声波传感一直是研究热点，如何突破探测极限是研究的关键。尽管近年来声学超材料的出现解决了其中的一些问题，但目前的声学超材料仍然存在尺寸过大、波导波矢量与周围介质不匹配等问题。为了解决这些问题，本文提出了一种非线性紧致梯度卷曲超材料（NCGCM）。在设计的NCGCM结构中，采用气隙深度的非线性变化来避免波矢量失配。声光栅厚度的线性变化保证了光栅的刚度，防止了声固耦合，气隙宽度的线性变化减少了热损失。气隙薄板长度的线性变化可以提高折射率，保证声增强效果。利用Comsol软件对NCGCM结构进行了声学模拟。仿真结果验证了NCGCM结构具有良好的频率选择性、声增强效果和良好的定向响应能力。它能有效地识别和捕获弱谐波信号和高斯脉冲信号。NCGCM结构为微弱声信号的检测和定向声定位提供了新的思路。设计的NCGCM结构采用光敏树脂材料进行3D打印完整制作，并通过实验进一步验证其性能。

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引用次数: 0

The effect of friction on the dynamics of targeted energy transfer by symmetric vibro-impact dampers 摩擦对对称振动冲击阻尼器目标能量传递动力学的影响

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-28 DOI: 10.1016/j.jsv.2025.119565

B. Youssef, A.Y. Karoui, R.I. Leine

This study investigates the nonlinear dynamics of a symmetric vibro-impact nonlinear energy sink (VI-NES) subjected to dry friction, a crucial factor that remains insufficiently explored in previous research. The combined effect of impact and friction leads to intricate behaviors that require further investigation. To address this, the multiple scales method is extended to incorporate frictional effects and is complemented with a generalized impact map approach. This allows for a systematic exploration of periodic solutions, stability, and bifurcations, revealing critical transitions between impact-dominated and sliding-dominated regimes. The activation thresholds and amplitude levels for different response regimes, including stick-slip dynamics, are identified, offering new insights into friction-induced nonlinearities. The results bridge the gap between theoretical modeling and practical implementation, offering a more accurate predictive framework for VI-NES behavior. This improves design strategies for enhanced energy dissipation and robustness in real-world applications.

本文研究了对称振动冲击非线性能量汇（VI-NES）在干摩擦作用下的非线性动力学，这是以往研究中尚未充分探讨的一个关键因素。碰撞和摩擦的共同作用导致了复杂的行为，需要进一步研究。为了解决这个问题，多尺度方法被扩展到包含摩擦效应，并与广义影响图方法相辅相成。这允许系统地探索周期解、稳定性和分岔，揭示冲击主导和滑动主导之间的关键转变。确定了不同响应机制（包括粘滑动力学）的激活阈值和振幅水平，为摩擦引起的非线性提供了新的见解。研究结果弥合了理论建模与实际实现之间的差距，为VI-NES行为提供了更准确的预测框架。这改进了在实际应用中增强能量耗散和鲁棒性的设计策略。

引用次数: 0

Theoretical corrections for measured sound pressure of hydrophones in vibrating liquid column 振动液柱中水听器实测声压的理论修正

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-27 DOI: 10.1016/j.jsv.2025.119536

Limu Qin , Gen Zhang , Jie Zhou , Bohan Shen , Wen He

The measured sound pressure of hydrophones (MSPH) corresponds to the pressure averaged over hydrophones effective sensitive area (ESA) due to hydrophones integrating properties, which is theoretically equivalent to the pressure at hydrophones acoustic center and can be approximated as the pressure at hydrophones geometric center in a uniform acoustic field. An accurate analytical solution for the MSPH serves as the critical foundation for ensuring calibration precision in the vibrating liquid column absolute calibration method (VLCACM). However, the current VLCACM inadequately considers the effects of hydrophones structure, acoustic field inhomogeneity and dynamic liquid column on the MSPH, leading to compromised calibration accuracy. In this scenario, a novel MSPH analytical framework that explicitly considers hydrophone-liquid column coupling effects is presented in this paper. Firstly, an ESA integral model and a spatial averaging correction theory are developed based on the integrating properties of hydrophones to resolve the liquid column acoustic field vertical inhomogeneity. Secondly, leveraging the Jacobi-Anger expansion, a harmonic correction theory for MSPH is formulated to quantify the effect of hydrophones dynamic measurement point caused by the simple harmonic motion of the liquid column on the MSPH, with recursive relationships derived for harmonic amplitude prediction. Finally, the proposed MSPH correction framework was experimentally validated over the frequency range of 10 Hz to 2000 Hz using a dedicated vibration liquid column calibration platform—comprising an electromagnetic standard shaker and an integrated measurement and control system—paired with a 27.5 mm diameter truncated spherical piezoelectric hydrophone exhibiting a sensitivity of approximately -173.7 dB. Results demonstrate that adapting the proposed spatial averaging and harmonic correction can effectively reduce calibration errors in VLCACM.

测得的水听器声压（MSPH）对应于水听器有效敏感区（ESA）上由于水听器的积分特性而产生的平均压力，理论上等同于水听器声中心处的压力，可以近似为均匀声场中水听器几何中心处的压力。在振动液柱绝对定标法（VLCACM）中，精确的MSPH解析解是保证定标精度的关键基础。然而，目前的VLCACM没有充分考虑水听器结构、声场不均匀性和动态液柱对MSPH的影响，导致校准精度降低。在这种情况下，本文提出了一种明确考虑水听-液柱耦合效应的新型MSPH分析框架。首先，基于水听器的积分特性，建立了欧空局积分模型和空间平均校正理论，解决了液柱声场垂直非均匀性问题；其次，利用Jacobi-Anger展开，建立了MSPH的谐波校正理论，量化了液柱简谐运动引起的水听器动态测点对MSPH的影响，并推导了递推关系，预测了谐波幅值。最后，在10 Hz至2000 Hz的频率范围内，使用专用振动液柱校准平台对所提出的MSPH校正框架进行了实验验证，该平台包括一个电磁标准激振器和一个集成测量和控制系统，并与一个27.5 mm直径的截断球形压电水听器（灵敏度约为-173.7 dB）相匹配。结果表明，采用本文提出的空间平均和谐波校正方法可以有效地降低vlccm的标定误差。

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引用次数: 0

Pseudo-intensity vector based sound speed measurement in indoor environments and its application to beamforming calibration 基于伪强度矢量的室内声速测量及其在波束形成标定中的应用

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-27 DOI: 10.1016/j.jsv.2025.119561

Bing Zhu, Wen Zhang, Xianrui Wang, Jingdong Chen

This work introduces a passive method for measuring the speed of sound in indoor reverberant environments using speech signals captured by first-order Ambisonic (FOA) microphones. This estimation is a key step in enhancing array signal processing performance, especially in environments where acoustic properties vary due to temperature and humidity changes. By leveraging the pseudo-intensity vector (PIV) derived from FOA signals, we can more accurately estimate the direction-of-arrival (DOA) of a source, independent of the sound speed. Additionally, we present a geometric model to compute the instantaneous sound speed based on the DOA and time delays estimated from signals recorded by two FOA microphones. The study further examines how factors such as source DOA, time delay, and FOA microphone spacing impact the accuracy of the estimate. Both simulations and experiments are conducted to validate the proposed method. Moreover, we demonstrate how instantaneous sound speed estimation can be used for beamforming calibration, facilitating robust beamformer design in time-varying acoustic environments.

本文介绍了一种利用一阶双声道（FOA）麦克风捕获的语音信号来测量室内混响环境中声速的被动方法。这种估计是提高阵列信号处理性能的关键步骤，特别是在声学特性因温度和湿度变化而变化的环境中。通过利用FOA信号的伪强度矢量（PIV），我们可以更准确地估计声源的到达方向（DOA），而不依赖于声速。此外，我们提出了一个几何模型来计算瞬时声速，该模型基于两个FOA麦克风记录的信号估计的DOA和时间延迟。该研究进一步研究了诸如源DOA、时间延迟和FOA麦克风间距等因素如何影响估计的准确性。通过仿真和实验验证了该方法的有效性。此外，我们还演示了如何将瞬时声速估计用于波束形成校准，从而促进时变声环境中鲁棒波束形成器的设计。

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引用次数: 0

Sommerfeld effect in a non-ideally excited simply-supported beam by considering full inertia parameters of the stator and rotor of the motor 考虑电机定子和转子全惯性参数的非理想激励简支梁中的索默菲尔德效应

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-27 DOI: 10.1016/j.jsv.2025.119570

SHIVAM UPADHYAY, RANJAN BHATTACHARYYA, ARUN K. SAMANTARAY

In this study, we conduct an analytical and numerical study to investigate the Sommerfeld effect in an internally damped, simply supported beam subjected to unbalance excitation in the transverse direction from a DC motor driven eccentric rotor, where the motor is arbitrarily positioned in the beam span. We study the effect of motor’s position and mass on the natural frequencies, mode shapes, system response, the critical power required to escape resonance capture, and the manifestation of the Sommerfeld effect. We use Hamilton’s principle to derive the governing partial differential equations (PDEs) of the system, which, separately, incorporate the mass and rotary inertia of the stator (including the housing) and the rotor of the motor. We estimate the steady-state dynamics by using the power balance method. The resonance capture and jump phenomena around the modal frequencies are analyzed, considering modal contributions up to the sixth mode. The unstable ranges of motor speed near resonance regions are determined, and transitions through those are analyzed. The effects of internal damping and inertia parameters on the amplitude, motor speed, and the threshold power required to pass through the resonances are investigated. In particular, the importance of inclusion of the stator and housing inertial parameters in the analysis is established. Analytically obtained steady-state results are then validated with transient response obtained through numerical simulations of a multi-energy domain bond graph model of the complete system.

在本研究中，我们进行了解析和数值研究，研究了内阻尼简支梁在受到直流电机驱动偏心转子横向不平衡激励时的索默菲尔德效应，其中电机在梁跨中任意位置。我们研究了电机的位置和质量对固有频率、模态振型、系统响应、逃避共振捕获所需的临界功率以及索默菲尔德效应的表现的影响。我们使用汉密尔顿原理推导出系统的控制偏微分方程（PDEs），其中分别包含电机定子（包括外壳）和转子的质量和旋转惯量。我们用功率平衡法估计稳态动力学。考虑到六阶模态的贡献，分析了模态频率周围的共振捕获和跳变现象。确定了谐振区附近电机转速的不稳定范围，并分析了谐振区附近电机转速的过渡。研究了内部阻尼和惯性参数对振幅、电机速度和通过共振所需的阈值功率的影响。特别指出了在分析中考虑定子和壳体惯性参数的重要性。然后通过对整个系统的多能域键图模型的数值模拟得到瞬态响应，对解析得到的稳态结果进行验证。

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引用次数: 0

Periodicity and pull-in instability in current-driven magMEMS: a Sturm’s theorem approach 电流驱动磁mems的周期性和拉入不稳定性：Sturm定理方法

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-26 DOI: 10.1016/j.jsv.2025.119560

Piotr Skrzypacz , Grant Ellis , Piotr Putek , Bartosz Pruchnik , Andrzej Dziedzic , Alen Abdildayev , Selim Onaibekov

The reliable operation of magnetic microelectromechanical systems (magMEMS) depends on the pull-in effect, which is triggered when the excitation exceeds a critical threshold value. Accurate prediction of this phenomenon under magnetostatic actuation is vital for a robust MEMS device design. This study leverages Sturm’s theorem to analyze dynamic pull-in magMEMS with current-carrying filaments, where instability typically results from the interaction between the kinetic and potential energy. The proposed method quickly determines, for a given excitation parameter, whether a periodic solution exists or pull-in occurs. Applicable to a broad range of MEMS devices, this approach supports the development of low-voltage, CMOS-compatible magnetic actuators. Findings of analytical approach are confirmed by detailed numerical illustrations. The discrepancy between three approximation methods is analyzed and discussed. The proposed algorithm is implemented in the high-level, high-performance programming language Julia. The appended codes can be easily used by MEMS designers.

磁微机电系统（magMEMS）的可靠运行依赖于拉入效应，当励磁超过临界阈值时就会触发拉入效应。在静磁驱动下准确预测这种现象对于稳健的MEMS器件设计至关重要。本研究利用Sturm定理来分析具有载流细丝的动态拉入磁mems，其中不稳定性通常是由于动能和势能之间的相互作用造成的。对于给定的激励参数，所提出的方法可以快速确定是否存在周期解或是否发生拉入。这种方法适用于广泛的MEMS器件，支持开发低压、cmos兼容的磁性执行器。通过详细的数值实例验证了分析方法的结论。对三种近似方法的差异进行了分析和讨论。该算法是在高级、高性能的编程语言Julia中实现的。附加的代码可以很容易地被MEMS设计人员使用。

{"title":"Periodicity and pull-in instability in current-driven magMEMS: a Sturm’s theorem approach","authors":"Piotr Skrzypacz , Grant Ellis , Piotr Putek , Bartosz Pruchnik , Andrzej Dziedzic , Alen Abdildayev , Selim Onaibekov","doi":"10.1016/j.jsv.2025.119560","DOIUrl":"10.1016/j.jsv.2025.119560","url":null,"abstract":"<div><div>The reliable operation of magnetic microelectromechanical systems (magMEMS) depends on the pull-in effect, which is triggered when the excitation exceeds a critical threshold value. Accurate prediction of this phenomenon under magnetostatic actuation is vital for a robust MEMS device design. This study leverages Sturm’s theorem to analyze dynamic pull-in magMEMS with current-carrying filaments, where instability typically results from the interaction between the kinetic and potential energy. The proposed method quickly determines, for a given excitation parameter, whether a periodic solution exists or pull-in occurs. Applicable to a broad range of MEMS devices, this approach supports the development of low-voltage, CMOS-compatible magnetic actuators. Findings of analytical approach are confirmed by detailed numerical illustrations. The discrepancy between three approximation methods is analyzed and discussed. The proposed algorithm is implemented in the high-level, high-performance programming language Julia. The appended codes can be easily used by MEMS designers.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119560"},"PeriodicalIF":4.9,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Filtering acoustic from hydrodynamic velocity using modal decomposition methods on an acoustic liner under grazing turbulent flow 利用模态分解方法对掠掠湍流条件下的声衬进行水动力速度声滤波

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-25 DOI: 10.1016/j.jsv.2025.119568

Francesco Scarano , Benshuai Lyu , Angelo Paduano , Francesco Avallone

The separation of acoustic-induced velocity from the turbulent velocity fluctuations is tackled on a numerical database representing a segment of an acoustic liner subjected to a grazing acoustic wave and turbulent flow. This scenario is meaningful due to the challenge of distinguishing sound-induced fluctuations from aerodynamic ones, and it has practical implications on the estimation of the liner’s impedance and sound absorption properties. The separation is performed employing modal decomposition methods: proper orthogonal decomposition (POD), spectral proper orthogonal decomposition (SPOD), and canonical correlation decomposition (CCD). The acoustic-induced velocity is reconstructed by selecting a limited number of modes representative of the acoustic-induced flow. All the decomposition methods are influenced by the acoustic-to-hydrodynamic fluctuation ratio, i.e., the relative amplitude of the acoustic waves and turbulent fluctuations. The CCD and SPOD outperform POD when the acoustic amplitude is low compared to the flow turbulence intensity. The acoustic forcing frequency must be known a priori or easily identifiable in the spectrum for SPOD. CCD better captures non-linear effects, e.g., due to the vortex shedding at high sound pressure levels, which are associated with high-order modes.

声源速度与湍流速度波动的分离是在一个数字数据库上进行的，该数据库代表了受掠声波和湍流影响的声学线性段。由于区分声致波动和气动波动的挑战，该场景具有重要意义，并且对估计衬垫的阻抗和吸声性能具有实际意义。采用模态分解方法进行分离：固有正交分解（POD）、光谱固有正交分解（SPOD）和典型相关分解（CCD）。通过选取有限数量的声源流模态来重建声源速度。所有的分解方法都受到声-水动力波动比的影响，即声波与湍流波动的相对振幅。当声幅较低时，CCD和SPOD的性能优于POD。声强迫频率必须是先验的或易于识别的。CCD可以更好地捕捉非线性效应，例如，由于高声压级下的涡流脱落，这与高阶模态有关。

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引用次数: 0

Stabilizing effects of two outlet pipes in the delayed oscillator model of pressure relief valves 减压阀延迟振荡模型中两出口管道的稳定作用

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-24 DOI: 10.1016/j.jsv.2025.119563

Fanni Kadar , Rifat Sipahi

Pressure relief valves are safety-critical elements of high-pressure systems, but design aspects need to be further developed to avoid their harmful vibrations. A mechanical model for a system consisting of a vessel, a direct spring operated pressure relief valve, and two outlet pipes is presented. The mathematical representation is a system of Delay Differential Algebraic Equations (DDAE) with two time delays created by traveling wave solutions of the Partial Differential Equations describing the dynamics in the pipes. Thus, the time delays correspond to wave propagation times in the pipes. The model is an extension to the single outlet pipe (single-delay) setup, which is a mathematical limit case of the two-delay problem. In the case of the single outlet pipe, it was shown that the traveling wave propagation in the pipe stabilizes the equilibrium of the corresponding DDAE. In this manuscript, we show that the two-pipe design is also able to stabilize the equilibrium, but importantly, it substantially expands the parameter domains for which stability holds while it improves the transient dynamics. The study requires the treatment of neutral time delay equations in the presence of delay cross-talk between the two time delays. Analytical and numerical techniques are applied in order to produce stability charts and study the robustness. Several engineering aspects are analyzed, and they show the two-pipe arrangement as a powerful tool to design stable operation conditions for various parameter settings.

减压阀是高压系统的安全关键元件，但设计方面需要进一步发展，以避免其有害的振动。给出了由一个容器、一个直接弹簧操作的减压阀和两根出口管道组成的系统的力学模型。其数学表示是由描述管道动力学的偏微分方程的行波解产生两个时间延迟的延迟微分代数方程（DDAE）系统。因此，时间延迟对应于波在管道中的传播时间。该模型是对单出口管道（单延迟）设置的扩展，是双延迟问题的数学极限情况。在单出口管道的情况下，行波在管道中的传播使相应的DDAE平衡趋于稳定。在本文中，我们证明了双管设计也能够稳定平衡，但重要的是，它在改善瞬态动力学的同时，大大扩展了稳定性所保持的参数域。本研究要求在两个时滞间存在时滞串扰的情况下，对中性时滞方程进行处理。本文采用解析和数值方法生成了稳定性图，并对鲁棒性进行了研究。从几个工程方面进行了分析，表明双管布置是设计各种参数设置下稳定运行条件的有力工具。

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引用次数: 0

Band gap analysis of the Kresling origami metamaterial with linear mode veering 具有线性模转向的Kresling折纸超材料带隙分析

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-24 DOI: 10.1016/j.jsv.2025.119566

Yuqi Wang , Wenpin Chen , Yunlong Li

Mode veering refers to a phenomenon that the mode curves of a coupled systems veer away and diverge when they approach each other, which has been extensively studied in many coupled models. As a famous Longitudinal-Torsional coupled structure, Kresling origami have been used in many fields, such as robotics, functional devices and wave control. However, despite its engineering significance, the underlying mechanism of mode veering in this structure remains inadequately explained-particularly the abrupt changes in modal trajectories caused by intrinsic dynamic constraints between different wave modes. To address this gap, this study first investigates a modified Kresling origami metamaterial via theoretical analysis and numerical simulations, with the aim of elucidating the origin and evolution of mode veering. Our main results reveal that, mode veering arises from the inherent conflict between the relative position inversions of the wave modes and the incompatibility of their respective oscillatory characteristics. This conflict is resolved through the existence of a characteristic frequency of the system that satisfies the pure torsional constraint, whose interaction with the mode curves manifests as mode veering.

模态转向是指耦合系统的模态曲线在相互接近时发生偏离和发散的现象，在许多耦合模型中得到了广泛的研究。Kresling折纸作为一种著名的纵扭耦合结构，在机器人、功能器件和波浪控制等领域得到了广泛的应用。然而，尽管具有重要的工程意义，但这种结构中模态转向的潜在机制仍然没有得到充分的解释，特别是不同波浪模态之间的内在动力约束引起的模态轨迹的突变。为了解决这一问题，本研究首先通过理论分析和数值模拟研究了一种改进的Kresling折纸超材料，旨在阐明模式转向的起源和演变。我们的主要结果表明，模态转向是由于波模的相对位置反转和各自振荡特性的不相容之间的内在冲突引起的。通过存在满足纯扭转约束的系统特征频率来解决这种冲突，其与模态曲线的相互作用表现为模态转向。

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引用次数: 0

Control of flow-structure-acoustic interactions of a non-Hermitian piezoelectric panel-cavity system in supersonic flow 超声速流动中非厄米压电板腔系统流-结构-声相互作用的控制

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-11-23 DOI: 10.1016/j.jsv.2025.119569

Shuai Liu, Jiawei Mao, Hao Liu, Penglin Gao, Yegao Qu, Guang Meng

Asymmetric energy transfer in a coupled elastic panel and acoustic cavity system subjected to supersonic flow induces non-Hermiticity and exceptional points (EPs) of the system. This paper introduces a non-Hermitian piezoelectric panel integrated with unidirectional amplification circuits for modulating the behaviors of EPs and the flow-structure-acoustic responses of the panel coupled with linear acoustic waves in a cavity and exposed to supersonic flow. A monolithic finite element model, as well as a partitioned, strongly coupled numerical algorithm within an arbitrary Lagrangian–Eulerian framework, is employed to analyze the eigenmodes and the nonlinear flow-structure-acoustic responses of the system. Within the framework of non-Hermitian physics and unbalanced energy transfer, non-Hermitian characteristics of the aerodynamic flutter and acoustic resonance of the system are reinterpreted. The unbalanced energy transfer mechanism of the sensor-actuation pair of the piezoelectric panel is confirmed to exhibit the capability of regulating EPs and enabling non-reciprocal energy propagation. It is found that a positive amplification feedback of the unidirectional circuit causes convergence and merger of the flutter and acoustic resonance ranges, whereas a negative amplification feedback leads to their separation. The system exhibits four distinct dynamic regimes under EP control: a quiescent mode regime with suppressed vibration, a pure acoustic resonance mode regime, a pure flutter mode regime, and a competitive aero-acoustic coupling mode regime. The proposed non-Hermitian control mechanism demonstrates superior controllability over conventional methods for flow-structure-acoustic interactions of a panel-cavity system in supersonic flow, enabling selective stabilization of desired operational modes while suppressing instabilities.

在超声速流作用下，弹性板-声腔耦合系统的非对称能量传递引起了系统的非厄米性和异常点。本文介绍了一种集成单向放大电路的非厄米压电面板，用于调制EPs的行为和面板在腔内和超声速流动中与线性声波耦合的流-结构-声响应。采用整体有限元模型和任意拉格朗日-欧拉框架内的强耦合数值算法，分析了系统的特征模态和非线性流-结构-声响应。在非厄米物理和不平衡能量传递的框架下，重新解释了系统气动颤振和声共振的非厄米特性。证实了压电板传感器-驱动副的非平衡能量传递机制具有调节EPs和非倒向能量传播的能力。发现单向电路的正放大反馈导致颤振和声共振范围的收敛和合并，而负放大反馈导致颤振和声共振范围的分离。在EP控制下，系统表现出四种不同的动态模式：振动被抑制的静态模式、纯声共振模式、纯颤振模式和竞争气声耦合模式。所提出的非厄米控制机制在超声速流动中对面板-腔体系统的流动-结构-声相互作用表现出优于传统方法的可控性，能够在抑制不稳定性的同时选择性地稳定所需的工作模式。

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引用次数: 0