Journal of Sound and Vibration最新文献_第3页

Scaling Up 3D elastic metamaterials with ultrawide band gaps: A modular approach with weight compensation 具有超宽带隙的三维弹性超材料：具有重量补偿的模块化方法

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-07 DOI: 10.1016/j.jsv.2026.119641

Berkay Acar, Sedef Nisan Otlu, Zafer Gokay Tetik, Cetin Yilmaz

Size plays a crucial role in designing and realizing 3D phononic crystals and elastic metamaterials with ultrawide band gaps. Existing 3D designs with normalized bandwidth larger than 133.3% are typically fabricated from polymers by additive manufacturing in small sizes (lattice constant  ≤  50 mm). Achieving large bandwidths often requires thin ligaments (flexures), which can fail or deform significantly under self-weight when scaled up, affecting unit cell shape and normalized bandwidth. To mitigate stress and deformation problems at larger scales, a modular design is introduced, enabling separate production of high and low stress-bearing components for assembly. A 3D truss-like structure is formed using steel inertial amplification mechanisms as 600 mm truss elements. Optimization yields a wide stop band but results in thin flexures within these mechanisms. To minimize the stresses and deformations in the inertially amplified 3D truss structure, which weighs more than 100 kg, static weight compensation technique is proposed in which some of the flexures are prestressed to a targeted value before assembly. Consequently, very small static deflection is observed due to self-weight. The optimized 3D truss structure is manufactured and tested. It is revealed that the optimized design provides a complete ultrawide stop band for 3D excitations between 6.2 - 87.8 Hz. Despite the large size and weight, and the stress constraints, an ultrawide band gap (173.6%) is attained.

尺寸是设计和实现三维声子晶体和具有超宽带隙的弹性超材料的关键因素。现有的归一化带宽大于133.3%的3D设计通常是由小尺寸的聚合物通过增材制造制造的（晶格常数 ≤ 50 mm）。实现大带宽通常需要细韧带（屈曲），当按比例放大时，其在自重下可能会失效或变形，从而影响单元胞的形状和归一化带宽。为了减轻更大规模的应力和变形问题，引入了模块化设计，可以单独生产高应力和低应力轴承组件进行组装。采用钢惯性放大机构作为600 mm桁架单元，形成三维桁架结构。优化产生宽止动带，但导致这些机构内的薄挠曲。为了使重量超过100 kg的惯性放大三维桁架结构的应力和变形最小化，提出了静态重量补偿技术，在装配前将部分挠度预应力到目标值。因此，由于自重，观察到非常小的静态偏转。对优化后的三维桁架结构进行了制造和试验。结果表明，优化后的设计在6.2 ~ 87.8 Hz范围内提供了一个完整的超宽止动带。尽管尺寸和重量较大，并且受到应力限制，但仍获得了超宽的带隙（173.6%）。

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引用次数: 0

Suppressing azimuthal thermoacoustic instabilities through symmetry-breaking flame response staging and exceptional points 通过破坏对称火焰响应阶段和异常点抑制方位热声不稳定性

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-07 DOI: 10.1016/j.jsv.2026.119642

Sylvain C. Humbert , Alessandro Orchini

The impacts of non-uniform flame response distributions on the stability of azimuthal thermoacoustic modes in annular combustors are investigated theoretically and illustrated in an experimental annular combustor test-rig with electroacoustic feedback. First, we exploit analytical results from an existing reduced-order model to establish and apply a general passive control strategy based on flame response staging to mitigate thermoacoustic instabilities stemming from both degenerate and non-degenerate eigenvalues. By means of a suitable pattern, an acoustics-flame response interaction that has a destabilising effect in the baseline symmetric configuration can be suppressed or turned into a stabilising interaction. For a mode pair whose degeneracy is lifted by the flame response staging pattern, our mitigation strategy exploits the presence of symmetry-breaking-induced exceptional points, which were recently identified in a previous study. The mitigation rules obtained when considering a degenerate or a non-degenerate mode in an isolated fashion are finally combined to establish a multi-mode strategy to prevent all azimuthal modes from being linearly unstable. The mitigation strategy is devised using a low-order model, and validated using an existing experimentally-determined state-space model and experiments in an electroacoustic feedback annular combustor test-rig. In addition, we show that if accurate estimates of the acoustic and thermoacoustic eigenvalues in the reference (symmetric) configuration are available, they can be exploited to calibrate the low-order model and then analytically predict the eigenvalues in the asymmetric configurations with good accuracy.

本文从理论上研究了火焰响应分布不均匀对环形燃烧室方位热声模态稳定性的影响，并在电声反馈环形燃烧室实验台上进行了验证。首先，我们利用现有降阶模型的分析结果，建立并应用基于火焰响应分期的一般被动控制策略，以减轻由简并和非简并特征值引起的热声不稳定性。通过适当的模式，在基线对称配置中具有不稳定效应的声-火焰响应相互作用可以被抑制或转化为稳定相互作用。对于简并度被火焰响应分期模式提升的模对，我们的缓解策略利用了对称性破坏引起的异常点的存在，这些异常点最近在先前的研究中被发现。最后将孤立地考虑简并模式和非简并模式时得到的缓解规则结合起来，建立多模式策略，以防止所有方位角模式线性不稳定。采用低阶模型设计了缓解策略，并使用现有的实验确定的状态空间模型和电声反馈环形燃烧室试验台的实验进行了验证。此外，我们表明，如果在参考（对称）配置的声学和热声特征值的准确估计是可用的，它们可以用来校准低阶模型，然后以良好的精度分析预测不对称配置的特征值。

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引用次数: 0

Enhancing acoustic scatterer inversion in closed domains with gradient-constrained deep learning 利用梯度约束深度学习增强封闭域声散射反演

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-06 DOI: 10.1016/j.jsv.2026.119644

Chunlin Jia , Zhanyu Li , Zixuan Yu , Hongkuan Zhang , Gengkai Hu

Accurately reconstructing scatterers within closed regions from sparse acoustic measurements presents a challenging inverse problem. Deep learning techniques are widely regarded as effective tools for solving such complex issues. However, conventional approaches often incur significant computational burdens by relying on massive training datasets to boost prediction accuracy. This paper presents an innovative approach that substantially improves network performance not by data augmentation, but by explicitly incorporating physical knowledge through adjoint-derived gradients. The method involves two synergistic stages: firstly, a physics-informed forward model is constructed by integrating gradient information via the adjoint method, which achieves 87 % higher accuracy in acoustic pressure prediction compared to standard data-driven counterparts on the test set; secondly, utilizing the trained forward network as a surrogate model to generate large-scale synthetic datasets for training a robust inverse estimation network. Results demonstrate superior performance: on independent test data, 99.94 % precision in determining scatterer count and high-precision reconstruction with localization resolution of 1/42 wavelength and radius resolution of 1/401 wavelength. Crucially, the method excels even in challenging acoustic shadow zones, surpassing traditional techniques. As the adjoint method is fundamental to sensitivity analysis across computational physics, this gradient-constrained framework can be readily extended to other inverse problems (including inverse electromagnetic scattering and elastic wave-based nondestructive testing) and gradient-based optimization applications like topology optimization, providing a pathway to enhanced accuracy with reduced data dependency.

从稀疏声测量中精确地重建封闭区域内的散射体是一个具有挑战性的逆问题。深度学习技术被广泛认为是解决此类复杂问题的有效工具。然而，传统的方法往往依赖于大量的训练数据集来提高预测精度，从而带来巨大的计算负担。本文提出了一种创新的方法，该方法不是通过数据增强，而是通过伴随衍生的梯度明确地结合物理知识，从而大大提高了网络性能。该方法包括两个协同阶段：首先，通过伴随方法集成梯度信息构建物理信息正演模型，与标准数据驱动的测试集相比，该模型的声压预测精度提高了87%；其次，利用训练好的正向网络作为代理模型，生成大规模的合成数据集，用于训练稳健的逆估计网络；结果表明：在独立测试数据上，散射体数量的确定精度为99.94%，定位分辨率为1/42波长，半径分辨率为1/401波长，高精度重建。至关重要的是，该方法甚至在具有挑战性的声学阴影区域中表现出色，超越了传统技术。由于伴随方法是计算物理灵敏度分析的基础，这种梯度约束框架可以很容易地扩展到其他逆问题（包括逆电磁散射和基于弹性波的无损检测）和基于梯度的优化应用，如拓扑优化，提供了一种通过减少数据依赖性来提高精度的途径。

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引用次数: 0

Direct impedance eduction of acoustic liners in multimodal ducts with shear flows 具有剪切流的多模态管道中声学衬垫的直接阻抗导出

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-05 DOI: 10.1016/j.jsv.2025.119635

Jinyue Yang , Thomas Humbert , Joachim Golliard , Gwénaël Gabard

Impedance eduction of acoustic liners with flow is usually performed under the assumption of a uniform mean flow and in the presence of an incident plane wave. However, recent studies have demonstrated that shear flow significantly influences the propagation of sound waves and their interaction with the liner. Consequently, it is crucial to characterize acoustic treatments in flow and acoustic conditions that closely resemble their target application, such as aircraft nacelles. This paper investigates and validates experimentally a direct method of impedance eduction in multimodal sound fields with shear flows on the MAINE Flow facility, which was validated only through simulations. Besides the double-liner configuration proposed to enhance the eduction robustness, additional developments are implemented, including a dominant mode selection algorithm to address the complexity introduced by multimodal fields and a 2-line microphone array design to avoid spurious mode effects. Different high-order incident modes (in the direction normal to the liner) are also considered. Finally, the recommended setup, with two types of liner samples, are used to investigate the effects of flow and incident acoustic field on liner impedance. It is also observed that using antisymmetric high-order modes as incident field significantly enhances the robustness of the eduction process.

流声衬垫的阻抗排除通常是在均匀平均流和入射平面波存在的假设下进行的。然而，近年来的研究表明，剪切流动对声波的传播及其与衬垫的相互作用有显著影响。因此，在与目标应用（如飞机机舱）非常相似的流动和声学条件下，对声学处理进行表征至关重要。本文研究并实验验证了在缅因流设备上的剪切流多模态声场中阻抗消减的直接方法，该方法仅通过模拟得到验证。除了提出的双线性配置以增强输出鲁棒性外，还实现了其他开发，包括解决多模态场引入的复杂性的主导模式选择算法和避免杂散模式效应的2线麦克风阵列设计。还考虑了不同的高阶入射模式（垂直于直线方向）。最后，采用推荐的设置和两种类型的衬垫样品，研究了流动和入射声场对衬垫阻抗的影响。我们还观察到，使用反对称高阶模作为入射场显著提高了导出过程的鲁棒性。

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引用次数: 0

Inverse quantification of dynamic strains and damping parameters via piezoresistive inversion in self-sensing materials 自传感材料的压阻反演动态应变和阻尼参数的反量化

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-04 DOI: 10.1016/j.jsv.2026.119636

Julio A. Hernandez , Fabio Semperlotti , Hongfei Zhu , Tyler N. Tallman

Self-sensing via the piezoresistive effect (i.e., having deformation-dependent electrical conductivity) has been widely explored in diverse applications. However, the overwhelming body of literature focuses on static or quasi-static loading, limiting the utility of self-sensing technologies in real-world applications where dynamic loading is prevalent. Moreover, while prior research often reports piezoresistive responses as relative changes in resistance or resistivity, end-users would much rather have direct insight into the underlying mechanical state (i.e., stress or strain) that gives rise to the observed piezoresistive response. This manuscript addresses these gaps by demonstrating 1) self-sensing principles can be used to track transient high-frequency strain wave packets and 2) mechanics such as dynamic strains and material-level properties (i.e., damping coefficients) can be deduced from electrical data. We demonstrate these contributions using carbon nanofiber (CNF)-modified epoxy rods subjected to dynamic end-loading while simultaneously recording electrical resistance data from a distributed surface-mounted electrode network along the rod’s length. A piezoresistivity model was then used to deduce strains from electrical measurements, and Rayleigh damping model parameters were extracted from this data. The piezoresistivity data-derived dynamics showed good agreement with finite element simulations, validating our approach to accurately extract the underlying dynamic mechanical state. These results show that it is indeed possible to quantify the mechanical state of a material from electrical data, thereby opening up exciting new possibilities for self-sensing in highly dynamic applications.

通过压阻效应（即具有与变形相关的导电性）的自传感已经在各种应用中得到了广泛的探索。然而，绝大多数文献都集中在静态或准静态加载上，限制了自传感技术在动态加载普遍存在的实际应用中的应用。此外，虽然先前的研究通常将压阻响应报告为电阻或电阻率的相对变化，但最终用户更愿意直接了解导致观察到的压阻响应的潜在机械状态（即应力或应变）。本文通过展示1)自传感原理可用于跟踪瞬态高频应变波包和2)力学，如动态应变和材料级特性（即阻尼系数）可以从电气数据中推断出来，从而解决了这些空白。我们使用纳米碳纤维（CNF）改性环氧树脂棒进行动态端载，同时记录沿棒长度分布的表面安装电极网络的电阻数据，证明了这些贡献。然后使用压阻模型从电测量中推断应变，并从该数据中提取瑞利阻尼模型参数。压电阻率数据推导的动力学结果与有限元模拟结果吻合良好，验证了我们准确提取底层动态力学状态的方法。这些结果表明，确实有可能从电数据中量化材料的机械状态，从而为高动态应用中的自传感开辟了令人兴奋的新可能性。

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引用次数: 0

A model-free B-WIM scheme for simultaneously identifying vehicle axle load and spacing with transmissibility-like index 基于类传递性指标同时识别车辆轴重和间距的无模型B-WIM方案

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-03 DOI: 10.1016/j.jsv.2026.119637

Teng-Teng Hao , Wang-Ji Yan , Meng-Kai Niu , Ka-Veng Yuen , Costas Papadimitriou

Bridge Weigh-in-Motion (B-WIM) systems provide vital traffic data for bridge design, management, and maintenance, yet conventional approaches often rely on bridge influence lines that are notoriously challenging to be identified accurately. While some model-independent approaches have been proposed, they typically estimate only partial parameters like axle loads, lacking the capability to simultaneously determine axle spacings. To address these limitations, this study proposes a model-free B-WIM methodology for simultaneous identification of vehicle axle loads and spacings using an influence line-free transmissibility-like index. This index, defined as the ratio of frequency-domain responses at the same location for two distinct vehicles, is analytically proven to equal the ratio of their moving load functions in the frequency domain, thereby eliminating the need for influence line estimation. Given the response of a reference vehicle with known axle configuration, this property enables the simultaneous identification of both axle loads and spacings. A Bayesian inference scheme is further developed to integrate multiple measurements and accommodate uncertainties stemming from measurement noise and modeling errors. Moreover, analytical likelihood function, gradients, and posterior covariances are derived to support efficient optimization scheme. Ultimately, numerical simulations and experimental studies validate the method’s accuracy and robustness under varying scenarios, without requiring influence line estimation.

桥梁动态称重（B-WIM）系统为桥梁设计、管理和维护提供了重要的交通数据，但传统方法通常依赖于桥梁影响线，这些影响线难以准确识别。虽然已经提出了一些与模型无关的方法，但它们通常只能估计轴载荷等部分参数，缺乏同时确定轴间距的能力。为了解决这些限制，本研究提出了一种无模型B-WIM方法，用于同时识别车辆轴载荷和间距，使用无影响线传输率指数。该指标被定义为两辆不同车辆在同一位置的频域响应之比，通过解析证明等于它们在频域的移动载荷函数之比，从而消除了对影响线估计的需要。给定具有已知轴配置的参考车辆的响应，该属性可以同时识别轴载荷和间距。进一步开发了贝叶斯推理方案，以整合多个测量并适应由测量噪声和建模误差引起的不确定性。此外，导出了分析似然函数、梯度和后验协方差来支持有效的优化方案。最后，通过数值模拟和实验研究验证了该方法在不同场景下的准确性和鲁棒性，无需估计影响线。

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引用次数: 0

Dynamic performance investigation of squirrel-cage elastic support structure in high-speed rotor system of aeroengine 航空发动机高速转子系统鼠笼式弹性支撑结构动态性能研究

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-03 DOI: 10.1016/j.jsv.2025.119630

Xu-Yuan Song , Chen-Guang Wang , Chang-Xin Yu , Xu Hao , Qing-Kai Han

As a crucial supporting component, the dynamic behaviour of the squirrel-cage elastic support (SCES) structure is vital for determining the operational stability of high-speed rotor systems in aero engines. However, the SCES structure is often oversimplified as a discrete model with restricted degrees of freedom during the traditional modelling process, making it a significant challenge to capture the dynamic behaviours of the system accurately. To overcome this limitation, this literature proposes a detailed analytical dynamic model of the squirrel-cage elastic support structure by approximating it as a medium-thick cylindrical shell structure with multiple circumferential rectangular cutouts. Firstly, the SCES structure is decomposed into several substructures of open cylindrical panels, and the corresponding kinetic and potential energy expressions are derived via the first-order shear deformation theory. Then, a series of orthogonal displacement functions is constructed as the trial functions of substructures. Meanwhile, the penalty functions are applied to ensure the displacement coordination between the substructures. Subsequently, the dynamic equation of the SCES structure is derived via the Rayleigh-Ritz method. After validating the analytical modelling by finite element simulation and experimental investigation, several complex dynamic performances have been revealed, including the phenomenon of modal density, the evolution of degenerate modes in the SCES structure, and the behaviours under multi-point cyclic excitation. The results indicate that the proposed modelling method provides a theoretical basis for dynamic design optimisation and fault diagnosis of squirrel-cage elastic support structures in aircraft engine rotor systems.

鼠笼弹性支承结构作为航空发动机高速旋翼系统的关键支撑部件，其动力学特性对旋翼系统的运行稳定性至关重要。然而，在传统的建模过程中，SCES结构往往被过度简化为一个具有有限自由度的离散模型，这给准确捕捉系统的动态行为带来了重大挑战。为了克服这一局限性，本文提出了一个详细的鼠笼弹性支撑结构解析动力学模型，将其近似为具有多个周向矩形切口的中厚圆柱壳结构。首先，将SCES结构分解为若干开式圆柱板子结构，并利用一阶剪切变形理论推导出相应的动能和势能表达式；然后，构造一系列正交位移函数作为子结构的试函数。同时，采用罚函数来保证子结构之间的位移协调。随后，采用瑞利-里兹法推导了结构的动力方程。通过有限元仿真和试验研究验证了解析模型的正确性，揭示了结构的复杂动力特性，包括模态密度现象、简并模态演化以及多点循环激励下的性能。结果表明，所提出的建模方法为航空发动机转子系统鼠笼式弹性支撑结构的动态设计优化和故障诊断提供了理论依据。

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引用次数: 0

An experimental self-structuring type-3 fuzzy vibration control: H∞-based robustness and online dynamic modeling 基于H∞鲁棒性和在线动态建模的实验性自结构3型模糊振动控制

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-03 DOI: 10.1016/j.jsv.2025.119634

Chunwei Zhang , Tianpeng Li , Ardashir Mohammadzadeh , Hamid Taghavifar , Rathinasamy Sakthivel

This paper presents a solution to the limitations of traditional vibration control methods, which often depend on precise structural parameters and mathematical models, leading to poor performance under real-world uncertainties and nonlinearities. The study introduces an vibration control system based on adaptive Active Rotary Inertia Driver (ARID) systems. This system integrates three key components: fractional-order dynamic fuzzy modeling for online system identification, a self-structuring Type-3 Fuzzy Logic System (T3-FLS) with non-singleton fuzzification to handle sensor noise and uncertainties, and an adaptive compensator based on the H_∞ theorem to ensure robustness against disturbances and parameter variations. The T3-FLS employs a new self-structuring algorithm that autonomously optimizes rule databases, membership functions, and parameters in response to dynamic conditions, addressing a gap in the existing literature regarding self-structuring mechanisms for T3-FLSs in vibration control applications. Experimental/simulation validation demonstrates the superiority of the proposed system compared to conventional methods. In experiments/simulations, the proposed algorithm achieved a peak angle of 0.009/0.005 rad and an RMS of 91.5%/95.7%, showing significant improvements over conventional methods, which only achieved 0.7%/1.4% and 0.8% /2.3% under perturbed dynamics (see the video of implementation at https://youtu.be/OWS8Ums95sQ.

传统的振动控制方法往往依赖于精确的结构参数和数学模型，导致在现实世界的不确定性和非线性下性能不佳，本文提出了一种解决方法。介绍了一种基于自适应主动旋转惯量驱动（ARID）系统的振动控制系统。该系统集成了三个关键组件：用于在线系统辨识的分数阶动态模糊建模，具有非单态模糊化的自结构3型模糊逻辑系统（T3-FLS），用于处理传感器噪声和不确定性，以及基于H∞定理的自适应补偿器，以确保对干扰和参数变化的鲁棒性。T3-FLS采用了一种新的自结构算法，可以根据动态条件自主优化规则数据库、隶属函数和参数，解决了现有文献中关于T3-FLS在振动控制应用中的自结构机制的空白。实验/仿真验证表明，与传统方法相比，所提出的系统具有优越性。在实验/仿真中，该算法的峰值角为0.009/0.005 rad， RMS为91.5%/95.7%，与传统方法相比有了显著的改进，传统方法在摄动动态下仅能达到0.7%/1.4%和0.8% /2.3%（参见https://youtu.be/OWS8Ums95sQ的实现视频）。

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引用次数: 0

A novel approach for identifying system poles using multi-reference transmissibility functions based on frequency shifts 一种基于频移的多参考传递率函数识别系统极点的新方法

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-03 DOI: 10.1016/j.jsv.2026.119638

Reza Tarinejad, Farhad Amanzad

System pole identification using Operational Modal Analysis (OMA) methods is often subject to significant estimation errors. A key source of these inaccuracies is the presence of non-periodic frequency components in short-domain earthquake records, which amplify variance errors, especially in higher modes. Additionally, violations of Fast Fourier Transform (FFT) assumptions on discrete signals introduce bias errors across all structural modes. To overcome these limitations, this study introduces a novel method called Multi-Reference Transmissibility Complex Frequency (MTCF). This approach defines new transmissibility matrices in the frequency domain using the z-transform framework. By integrating both forward and backward frequency shifts into the transmissibility functions, MTCF effectively reduces variance errors, particularly in higher modes, while also minimizing bias across all modes. The method's performance is evaluated using a four-degree-of-freedom reinforced concrete frame subjected to three different earthquake records under varying loading conditions. Results show that natural frequencies and mode shapes and damping ratios of higher modes are identified with accuracy comparable to lower modes, eliminating the need to decompose frequency responses into single-frequency components for damping estimation. Unlike OMA-based techniques, where higher modes often remain undetected or exhibit larger errors, the MTCF method Mitigates spectral leakage and numerical dispersion. This enables accurate and robust identification of all modal parameters, regardless of the structure’s degrees of freedom or the complexity of external excitations.

使用运维模态分析（OMA）方法进行系统极点辨识时，往往存在较大的估计误差。这些不准确的一个关键来源是在短域地震记录中存在的非周期频率分量，它放大了方差误差，特别是在更高的模态中。此外，对离散信号的快速傅里叶变换（FFT）假设的违反会在所有结构模式中引入偏置误差。为了克服这些限制，本研究引入了一种称为多参考传输率复频率（MTCF）的新方法。该方法使用z变换框架在频域定义新的透射率矩阵。通过将前向和后向频移整合到透射率函数中，MTCF有效地减少了方差误差，特别是在更高的模式下，同时还最小化了所有模式的偏差。采用四自由度钢筋混凝土框架在不同荷载条件下承受三种不同地震记录，对该方法的性能进行了评估。结果表明，高阶模态的固有频率、模态振型和阻尼比的识别精度与低阶模态相当，无需将频率响应分解为单频分量进行阻尼估计。与基于oma的技术不同，基于oma的技术通常无法检测到更高的模式或显示更大的误差，MTCF方法减轻了频谱泄漏和数值色散。这使得所有模态参数的准确和稳健的识别，而不管结构的自由度或外部激励的复杂性。

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引用次数: 0

Negative stiffness friction damper with viscoelastic connection for cable vibration control 用于电缆振动控制的粘弹性连接负刚度摩擦阻尼器

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-03 DOI: 10.1016/j.jsv.2025.119632

Lin Chen , Jiaxu Tan , Nahimul Nabil Muhit , Limin Sun

Cables in cable-supported bridges are susceptible to multimode vibrations under environmental excitations such as wind and rain. Mechanical dampers, commonly installed near the lower end of the cable, are widely used for vibration control. However, as cable length increases, these dampers face challenges in meeting design requirements due to the relatively shorter installation distance and the growing number of target vibration modes. To address this issue, this study proposes a novel negative stiffness friction damper (NSFD) for cable vibration control. The NSFD employs a precompressed spring to generate both the negative stiffness effect and the normal force on the friction interface. A lever arm is introduced to amplify both the negative stiffness and the friction force. Furthermore, high-damping rubber elements are integrated as the viscoelastic connection to provide damping during small-amplitude vibrations, when the friction interface does not engage. The linearized negative stiffness coefficient of the NSFD is derived, and its damping performance is evaluated analytically using an energy equivalence approach. A numerical model of the cable-NSFD system is developed, incorporating friction behavior described by the LuGre model, to further investigate its vibration reduction effectiveness. Numerical analysis results demonstrate that the NSFD significantly enhances the damping performance compared to traditional friction dampers and achieves comparable performance to that of an optimal viscous damper with negative stiffness. Moreover, the NSFD offers improved stability due to static friction and delivers nearly frequency-independent control across multiple vibration modes.

在风、雨等环境激励下，索桥中的电缆易受多模态振动的影响。机械阻尼器通常安装在电缆下端附近，广泛用于振动控制。然而，随着电缆长度的增加，由于相对较短的安装距离和越来越多的目标振动模式，这些阻尼器在满足设计要求方面面临挑战。为了解决这一问题，本研究提出了一种新型的负刚度摩擦阻尼器（NSFD）用于电缆振动控制。NSFD采用预压缩弹簧在摩擦界面上产生负刚度效应和法向力。引入杠杆臂来放大负刚度和摩擦力。此外，当摩擦界面不啮合时，高阻尼橡胶元件作为粘弹性连接集成在一起，在小振幅振动时提供阻尼。推导了非NSFD的线性化负刚度系数，并采用能量等效法对其阻尼性能进行了解析评价。建立了拉索-非nsfd系统的数值模型，结合LuGre模型描述的摩擦行为，进一步研究了其减振效果。数值分析结果表明，与传统的摩擦阻尼器相比，NSFD显著提高了阻尼性能，并达到了与负刚度最优粘性阻尼器相当的性能。此外，由于静摩擦，NSFD提供了更好的稳定性，并且在多种振动模式下提供了几乎与频率无关的控制。

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引用次数: 0