Journal of Sound and Vibration最新文献_第10页

Nonlinear dynamics of a piezoelectric wind energy harvester by exploiting vortex-induced vibration 利用涡激振动研究压电式风能采集器的非线性动力学

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-09 DOI: 10.1016/j.jsv.2025.119605

Kang Lu, Xiong Xiong, Zheng Zeng, Zichen Deng, Rongchun Hu

In this paper, a piezoelectric energy harvester by exploiting vortex-induced vibration (VIV) under the influence of random wind excitation is designed and the associated nonlinear dynamics is investigated comprehensively. The dynamic equations of motion considering the inherent randomness, including the modified Hartlen-Currie model characterizing the random wind forces, are formulated for the piezoelectric energy harvester. Stochastic averaging method is then employed to derive the stationary distribution of mechanical states, providing insights into the long-term behavior of the system. Both the resonant case and the non-resonant case between Strouhal frequency of incoming wind with the natural frequency of the piezoelectric beam are investigated in detail. Performance metrics, including mean square electric voltage (MSEV) and mean output power (MOP), are theoretically obtained through the analysis. Parameter sensitivity analysis is applied to enhance efficiency, and the results are validated through comparisons with numerical simulation and wind tunnel experiments. The findings from this study offer valuable insights into optimizing the design and enhancing the reliability of piezoelectric energy harvesters under the influence of fluctuating wind conditions.

设计了一种利用随机风激励下涡激振动的压电能量采集器，并对其非线性动力学特性进行了全面研究。建立了考虑固有随机性的压电能量采集器的动力学方程，包括表征随机风力的改进Hartlen-Currie模型。然后采用随机平均方法推导机械状态的平稳分布，从而深入了解系统的长期行为。详细研究了入风斯特劳哈尔频率与压电梁固有频率之间的谐振情况和非谐振情况。通过分析，从理论上得到了性能指标，包括均方电压（MSEV）和平均输出功率（MOP）。采用参数敏感性分析方法提高了效率，并与数值模拟和风洞实验结果进行了对比验证。该研究结果为在波动风条件下优化设计和提高压电能量采集器的可靠性提供了有价值的见解。

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引用次数: 0

A new modeling approach for an eigenvalue analysis of a shrink-fitted shaft-disc assembly 收缩式轴盘总成特征值分析的一种新的建模方法

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-01 DOI: 10.1016/j.jsv.2025.119587

Gyan Setu, A K Darpe, B Premachandran

An assembly of a disc shrink-fitted on a shaft are widely used in industry to provide a tight mounting enabling a positive drive. Although this kind of mounting alleviates the need for keyways and keys, the contact pressure from the interference fit generates localized stress and deformation in the shaft and the mounted disc. The increased stress may influence the natural frequencies and the dynamics of the shaft depending on the disc/hub dimensions. Earlier, the effect of such a disc mounting was accounted for in the model by raising the diameter of the shaft at the mounting location, without systematically studying the effect of the varying degree of the interference fit. The present work introduces a novel analytical approach to account for the shrink-fit of the mounted disc on the shaft for different interference fit levels and shaft-disc configurations (disc diameter and thickness). The contact pressure due to shrink fit is modelled as a uniform axisymmetric pressure band in the shrink fit region. The stress and deformation in the shaft and disc are evaluated using the Fourier-Bessel formulation. The proposed method utilizes mathematical formulation to evaluate the fit-induced axial stress and the corresponding increase in the stiffness. The method then estimates the required diameter of the step at the shrink-fit region more precisely than predicted by a previous approach. The objective is also to investigate the extent of the influence of the induced local stress due to the shrink fit on the bending natural frequency of the shaft-disc assembly. To validate the proposed approach, an experimental modal analysis is performed on the test specimen with shrink fit and the measured natural frequencies are compared with the calculated ones. The experimental natural frequencies for off-center shaft-disc configurations and overhung shaft-hub configurations are within 5 % of those obtained theoretically, signifying the capability of the proposed mathematical approach to model the shrink-fit assembly accurately. In contrast to the empirical approach of modeling the shrink fit, the novel modelling approach presented in the paper offers a systematic and better way of modeling and of accurately predicting the associated bending natural frequencies.

在工业中，广泛使用安装在轴上的圆盘收缩装置，以提供一个紧密的安装，从而实现积极的驱动。虽然这种安装方式减轻了对键槽和键的需求，但过盈配合产生的接触压力会在轴和安装的圆盘中产生局部应力和变形。增加的应力可能会影响轴的固有频率和动力学，这取决于盘/轮毂的尺寸。早先，在模型中，这种圆盘安装的影响是通过提高安装位置轴的直径来解释的，而没有系统地研究过盈配合不同程度的影响。目前的工作介绍了一种新的分析方法，以解释不同过盈配合水平和轴-盘配置（盘直径和厚度）的轴上安装的盘的收缩配合。将收缩配合的接触压力建模为收缩配合区域内的均匀轴对称压力带。用傅里叶-贝塞尔公式计算了轴和盘的应力和变形。该方法利用数学公式来计算拟合引起的轴向应力和相应的刚度增加。然后，该方法比以前的方法更精确地估计在收缩拟合区域的步长所需的直径。目的还在于研究由于收缩配合引起的局部应力对轴盘总成弯曲固有频率的影响程度。为了验证所提出的方法，对收缩拟合的试样进行了实验模态分析，并将测量的固有频率与计算的固有频率进行了比较。离心轴-盘结构和悬垂轴-轮毂结构的实验固有频率与理论计算的固有频率在5%以内，表明所提出的数学方法能够准确地模拟收缩配合总成。相对于收缩拟合的经验建模方法，本文提出的新建模方法提供了一种系统的、更好的建模方法，并能准确地预测相关的弯曲固有频率。

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引用次数: 0

Analytical solutions to free vibration of beam with discontinuities caused by springs 弹簧引起的不连续梁自由振动的解析解

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-01 DOI: 10.1016/j.jsv.2025.119559

Yin Zhang , Han Wu

Four types of springs, which are widely used to model the beam defects and stiffening effects, induce the discontinuities of the beam displacement and its first, second and third derivatives. These discontinuities can either increase or decrease the beam stiffness. The variations of beam stiffness change its natural frequencies and mode shapes. The four types of springs are modeled as the concentrated ones, which are characterized by the generalized functions of the Dirac delta function and its derivatives. The new analytical solutions to the free vibration of the Euler–Bernoulli beam with these four discontinuities are derived. By constructing the proper solution forms and using the distributional derivative rule of the generalized functions, the new analytical solutions are derived, which are the direct solutions to the fourth order differential equation of the Euler–Bernoulli beam governing equation with the presence of the generalized functions. The analytical solutions are with the advantage of satisfying all the transition conditions. With the analytical solutions, the eigenvalue problem formulation only involves the beam boundary conditions, which is a 4 × 4 matrix computation and significantly simplifies the problem formulation procedure. This new eigenvalue problem formulation provides an efficient method of computing the natural frequencies and mode shapes of the beam with the discontinuities caused by the springs. Besides the defects and stiffening effects, the beam boundaries can also be modeled by these four types of springs. With the different combinations of the four types of springs, various and general beam boundary conditions are formed. With the models of these four types of springs, the analytical solution to the free vibration of a beam with more general defects, stiffening effects and boundary conditions is presented.

四种类型的弹簧被广泛用于模拟梁的缺陷和加劲效应，它们会引起梁的位移及其一、二、三阶导数的不连续。这些不连续可以增加或减少梁的刚度。梁刚度的变化改变了梁的固有频率和振型。将四种类型的弹簧建模为集中弹簧，用狄拉克函数及其导数的广义函数来表征。导出了具有这四种不连续点的欧拉-伯努利梁自由振动的新解析解。通过构造适当的解形式，利用广义函数的分配导数法则，导出了新的解析解，即在广义函数存在下欧拉-伯努利梁控制方程的四阶微分方程的直接解。解析解具有满足所有过渡条件的优点。利用解析解，特征值问题的表述只涉及梁边界条件，为4 × 4矩阵计算，大大简化了问题的表述过程。这种新的特征值问题公式提供了计算由弹簧引起的不连续梁的固有频率和模态振型的有效方法。除了缺陷和加劲效应外，这四种类型的弹簧也可以用来模拟梁的边界。随着这四种弹簧的不同组合，形成了不同的和一般的梁边界条件。利用这四种类型的弹簧模型，给出了具有更一般缺陷、加劲效应和边界条件的梁的自由振动的解析解。

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引用次数: 0

A comparison of deterministic and Bayesian model updating frameworks for identifying offshore wind turbine foundation parameters 海上风力机基础参数识别的确定性和贝叶斯模型更新框架比较

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-11-30 DOI: 10.1016/j.jsv.2025.119575

Harry A. Simpson , Eleni N. Chatzi , Manolis N. Chatzis

The rapid growth of the wind industry has resulted in larger wind turbines, whose modal properties lie in the lower frequency range. This has induced higher loads and stress cycles rendering accurate fatigue assessment increasingly important. Such assessment is highly affected by the precision in the estimation of turbine properties, including those related to the support conditions and foundation, which can be associated with high uncertainty. One approach to improve these estimates is to use structural monitoring data (e.g. from sensors mounted on the tower) to update the foundation parameters of offshore wind turbine models. However, the low identifiability of the parameters to be estimated can lead to divergent estimates across different fatigue estimation frameworks, which combined with the uncertainty inherent in the foundation properties, can compromise the reliable assessment of the remaining useful life. In this work, two Bayesian model updating frameworks are applied to update the foundation parameters of an offshore wind turbine and results are compared against a deterministic framework in a numerical example. The advantages and limitations of each framework are considered and the importance of accurately accounting for uncertainties as part of the model updating process is highlighted.

风力工业的快速发展导致了更大的风力涡轮机，其模态特性在较低的频率范围内。这导致了更高的载荷和应力循环，使得准确的疲劳评估变得越来越重要。这种评估很大程度上受到涡轮性能估计精度的影响，包括与支撑条件和基础有关的性能，这些特性具有很高的不确定性。改进这些估计的一种方法是使用结构监测数据（例如安装在塔上的传感器）来更新海上风力涡轮机模型的基础参数。然而，要估计的参数的低可识别性可能导致不同疲劳估计框架之间的不同估计，这与基础特性固有的不确定性相结合，可能会损害对剩余使用寿命的可靠评估。本文采用两种贝叶斯模型更新框架对海上风力机基础参数进行了更新，并与确定性框架进行了数值算例比较。考虑了每个框架的优点和局限性，并强调了作为模型更新过程的一部分准确考虑不确定性的重要性。

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引用次数: 0

Sound radiation from circular duct with inflow 有流入的圆形管道声辐射

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-06 DOI: 10.1016/j.jsv.2025.119602

Wang Liwei, Fan Yiliang, Ji Zhenlin

The prediction of the reflection coefficient of a circular duct with inflow remains understudied despite its critical importance for intake noise control of power machineries, for examples IC engines, blowers, and fans. This work proposes a methodology based on solving the two-dimensional (2-D) axisymmetric frequency domain linearized Navier-Stokes equations (LNSEs) to determine the reflection coefficient and end correction for bellmouth-terminated and sharp-edged ducts in the presence of inflow. Numerical results show that the bellmouth configuration suppresses flow separation by the optimized curvature, yielding the consistent magnitude of the reflection coefficient with convection-dominated potential flow solution. Conversely, for the sharp-edged duct, flow separation at the lip generates an internal jet where the vortex-sound interaction facilitates the energy transfer from sound field to flow field, leading to the magnitude of the reflection coefficient lower than the potential flow solution. The predictions of the reflection coefficient for finite-thickness ducts are relatively consistent with the published empirical formula within the range of the Helmholtz number (ka) up to 3.8 (corresponding to the first radial mode), demonstrating the applicability of the extrapolated formula. Simulations for ducts with different wall thicknesses reveal that the magnitude of the reflection coefficient at low ka correlates directly with the vena contracta coefficient. Based on this finding, a modified formula for the reflection coefficient is proposed to improve the accuracy. Additionally, the predictions of the end correction for both the bellmouth-terminated and sharp-edged ducts demonstrate that the end correction is primarily governed by the mean flow convection and the influence of vortex-sound interaction is negligible.

尽管圆形管道的反射系数对动力机械（如内燃机、鼓风机和风扇）的进气噪声控制至关重要，但其预测仍未得到充分研究。本研究提出了一种基于求解二维轴对称频域线性化Navier-Stokes方程（lnss）的方法，以确定在流入存在的情况下，钟口端部和锐边管道的反射系数和末端校正。数值计算结果表明，喇叭口结构通过优化的曲率抑制了流动分离，使反射系数的大小与对流主导的势流解一致。相反，对于锐边导管，唇部的流动分离产生内部射流，涡声相互作用促进了能量从声场向流场的传递，导致反射系数的大小低于势流解。在亥姆霍兹数（ka）至3.8（对应第一径向模态）范围内，有限厚度管道反射系数的预测与已发表的经验公式相对一致，证明了外推公式的适用性。对不同壁厚管道的模拟表明，低ka反射系数的大小与静脉收缩系数直接相关。在此基础上，提出了一种修正的反射系数公式，以提高反射系数的精度。此外，对喇叭口末端和锐边管道的末端校正的预测表明，末端校正主要受平均对流流的控制，涡声相互作用的影响可以忽略不计。

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引用次数: 0

Nonlinear magnetic force coupled piezoelectric cantilever beam-spring pendulum for multi-directional vibration energy harvesting 非线性磁力耦合压电悬臂梁-弹簧摆多向振动能量收集

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-11-29 DOI: 10.1016/j.jsv.2025.119578

Yunshun Zhang , Guangsong Zhang , Yuyang Qian , Yunrong Wang

Harvesting energy from environmental vibrations to power devices such as wireless sensors holds significant potential. Given the multi-directional nature of environmental vibration energy, this study introduces a piezoelectric cantilever beam-spring pendulum system influenced by nonlinear magnetic forces. The structure is influenced by both internal energy exchange and nonlinear magnetic interactions between magnets. The magnetic energy equations are established through the magnetic dipole model and combined with the energy equations of the structure to derive the governing equations utilizing the Lagrange's equations. The corresponding modelling analyses and numerical simulations demonstrate that, under appropriate parameter configurations, the interplay between internal energy exchange and nonlinear magnetic forces achieves a significant enhancement effect. Compared to other structures, the bandwidth of the proposed structure can be increased up to 115.98 % under x-direction excitation. The maximum RMS voltage can be improved up to 151.83 % under z-direction.

从环境振动中收集能量来为无线传感器等设备供电具有巨大的潜力。考虑到环境振动能量的多向性，本文提出了一种受非线性磁力影响的压电悬臂梁-弹簧摆系统。该结构受内部能量交换和磁体间非线性磁相互作用的影响。通过磁偶极子模型建立磁能方程，结合结构的能量方程，利用拉格朗日方程推导出控制方程。相应的建模分析和数值模拟表明，在适当的参数配置下，内能交换与非线性磁力之间的相互作用取得了显著的增强效果。与其他结构相比，在x向激励下，该结构的带宽可提高115.98%。在z方向上，最大均方根电压可提高151.83%。

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引用次数: 0

Different modeling methodologies for rotor-system on ball bearing cartridge with squeeze film damper 含挤压膜阻尼器球轴承插装转子系统的不同建模方法

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-11 DOI: 10.1016/j.jsv.2025.119606

Faisal Sadaat, Charles Nutakor, Jussi Sopanen

Ball bearing-squeeze film damper (BB-SFD) cartridges are increasingly employed in high-speed rotating machinery, such as automotive turbochargers and gas turbines, due to their ability to reduce friction and enhance rotordynamic stability. Despite their growing use, accurately modeling the dynamic behavior of these systems remains challenging. This is primarily due to the nonlinear characteristics of oil film forces and the complex interaction between the bearing components particularly the outer race and the squeeze film lands. This study presents four distinct modeling approaches for the BB-SFD cartridge: single-mass, two-mass, beam-element, and rigid-body formulations. The squeeze film damper is represented using an open-ended short-bearing configuration, with oil film forces computed based on the motion of the outer race. It is observed that gravitational effects cause the outer race to become off-centered, resulting in nonlinear dynamic behavior that significantly influences system response. An automotive turbocharger is used as a case study to evaluate the performance of each modeling approach. Experimental modal analysis and dynamic testing are used to verify the simulation model. The two-mass formulation offers a favorable balance between computational efficiency and accuracy among the models considered. The rigid-body model provides a generalized framework that can be extended to other bearing configurations, including journal bearings and rigid supports. By addressing limitations in existing models and incorporating outer race dynamics, this work contributes to the development of more reliable and efficient simulation tools for high-speed rotor-bearing systems.

由于球轴承-挤压膜阻尼器（BB-SFD）能够减少摩擦并提高转子动态稳定性，因此越来越多地应用于高速旋转机械，如汽车涡轮增压器和燃气轮机。尽管它们的应用越来越广泛，但准确建模这些系统的动态行为仍然具有挑战性。这主要是由于油膜力的非线性特性和轴承部件之间复杂的相互作用，特别是外圈和挤压膜地。本研究提出了BB-SFD药筒的四种不同的建模方法：单质量、双质量、梁单元和刚体配方。挤压膜阻尼器使用开放式短轴承结构表示，油膜力根据外圈的运动计算。我们观察到，重力效应会使外圈偏离中心，从而导致非线性动力学行为，显著影响系统响应。以汽车涡轮增压器为例，对每种建模方法的性能进行了评价。采用实验模态分析和动态试验对仿真模型进行了验证。双质量公式在所考虑的模型之间提供了计算效率和精度之间的良好平衡。刚体模型提供了一个广义的框架，可以扩展到其他轴承配置，包括轴颈轴承和刚性支撑。通过解决现有模型的局限性，并结合外圈动力学，这项工作有助于开发更可靠、更有效的高速转子轴承系统仿真工具。

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引用次数: 0

Frequency and time domain prediction of railway curve squeal including multiple wheel/rail contact points 包含多个轮轨接触点的铁路曲线噪声的频域和时域预测

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-11-15 DOI: 10.1016/j.jsv.2025.119547

Federico Castellini , Giacomo Squicciarini , David Thompson , Egidio Di Gialleonardo , Roberto Corradi

Curve squeal is a high-frequency tonal noise produced by rail vehicles on tight curves, with its occurrence subject to various uncertainties. The generation mechanism is typically attributed to self-excited vibration within the wheel/rail system, with the leading inner wheel of the vehicle often being the most prone to squeal. However, loud and tonal noise is also found to be generated by the outer wheel or for trams when the leading inner wheel is in contact with the grooved rail head. This article presents a wheel/rail interaction model accounting for the presence of multiple contact points between the wheel and the rail. It is used to study the squeal noise generated by a modern low-floor tramcar equipped with resilient wheels. Time-domain simulations are carried out in the case of contact between the flange back of the inner leading wheel and the grooved head. The simulations also reveal that the outer wheel in flange contact can be involved in curve squeal. Variation in the lateral contact point position and the activation of a second contact point on the flange back are found to potentially alter the frequencies involved in the squealing mechanism and the wheel vibration amplitude. A comparison of time-domain simulation results for multiple contact points with full-scale on-track measurements is presented, analysing the inner and outer wheel squeal generated by the tramcar. The squeal is predicted at the same frequencies observed during experiments. Furthermore, the wheel vibration levels in the axial and radial directions are aligned with those measured by accelerometers mounted on the wheels.

曲线啸叫是轨道车辆在狭窄弯道上产生的高频音调噪声，其产生受各种不确定性的影响。产生机制通常归因于轮轨系统内部的自激振动，其中车辆的领先内轮通常最容易产生尖叫。然而，当前导内轮与槽轨头接触时，也发现外轮或有轨电车会产生响亮的音调噪声。本文提出了一个车轮/轨道相互作用模型，考虑到车轮和轨道之间存在多个接触点。采用该方法研究了装有弹性车轮的现代低地板有轨电车的尖叫噪声。对内导轮凸缘后部与槽头接触的情况进行了时域仿真。仿真结果还表明，外轮与法兰接触时也会产生曲线尖叫。横向接触点位置的变化和法兰背面第二个接触点的激活可能会改变尖叫机构和车轮振动幅度所涉及的频率。分析了有轨电车产生的内外轮尖啸声，并将多接触点时域仿真结果与全尺寸轨道实测结果进行了比较。在实验中观察到的相同频率上预测了尖叫。此外，车轮在轴向和径向上的振动水平与安装在车轮上的加速度计测量的水平一致。

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引用次数: 0

Vibration response variability in friction-damped systems: Quantification of the influence of contact and traction uncertainties 摩擦阻尼系统的振动响应变异性：接触和牵引不确定性影响的量化

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-03-17 Epub Date: 2025-12-01 DOI: 10.1016/j.jsv.2025.119571

Nidish Narayanaa Balaji , Erhan Ferhatoglu

Dynamic responses of friction-damped structures often exhibit significant variability due to uncertainties inherent in both contact parameters and residual tractions. While the former are closely related to the epistemic description of the interfacial contact, the latter reflects the loading history. Although previous studies have individually examined the impact of these uncertainties on the response variability, their simultaneous consideration with a comparative quantification remains unexplored. To address this gap, we present a parametric analysis in the context of uncertainty propagation and sensitivity analysis using Polynomial Chaos Expansion. In this study, the variability of the amplitude-dependent nonlinear modal properties due to the above uncertainties are examined as a metric to assess the influence of such parameters on the overall dynamics. We use a planar 3-mass frictional oscillator representing a simplified model of two adjacent blades with an underplatform damper as the numerical benchmark for the investigations. The influence of different probability distributions is investigated and it is shown that frequency variability is predominantly governed by the uncertainty in tangential contact stiffness. On the other hand, the damping behavior in the partial slip regime is highly sensitive to the non-unique nature of residual tractions. While contact parameter uncertainty is widely recognized as a primary source of vibration response variability within the joint mechanics community, the findings of this study underline the critical importance of accounting for the non-unique nature of residual tractions.

由于接触参数和残余牵引力的不确定性，摩擦阻尼结构的动力响应往往表现出显著的可变性。前者与界面接触的认知描述密切相关，后者则反映了加载历史。虽然以前的研究单独考察了这些不确定性对响应变异性的影响，但它们与比较量化的同时考虑仍未得到探索。为了解决这一问题，我们提出了一种基于不确定性传播和灵敏度分析的多项式混沌展开的参数分析方法。在本研究中，由于上述不确定性，振幅相关的非线性模态特性的可变性被作为一个度量来评估这些参数对整体动力学的影响。我们使用一个平面3质量摩擦振荡器作为研究的数值基准，它代表了两个相邻叶片的简化模型，并带有平台下阻尼器。研究了不同概率分布的影响，表明频率变化主要由切向接触刚度的不确定性决定。另一方面，部分滑移状态下的阻尼特性对残余牵引力的非唯一性非常敏感。虽然接触参数的不确定性在关节力学领域被广泛认为是振动响应变异性的主要来源，但本研究的结果强调了考虑残余牵引力的非唯一性的重要性。

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引用次数: 0

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 : 2026-03-17 Epub 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