Journal of Sound and Vibration最新文献_第5页

Hybrid nonlinear energy sink, a tunable device for vibration mitigation : Theorical and experimental demonstration 混合非线性能量阱——一种可调减振装置：理论与实验论证

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-09 DOI: 10.1016/j.jsv.2025.119577

Louis Mesny , Sébastien Baguet , Roberto Alcorta , Alireza Ture Savadkoohi , Claude-Henri Lamarque , Simon Chesné

Hybridization is a powerful and recent technology that combines passive and active components to enhance system performance. The central idea behind this approach is to improve the responsiveness and adaptability of the passive energy absorption mechanism by integrating a control law supported by actuator/sensor pairs. This combination enables the system to dynamically adapt itself to varying excitation conditions, thereby significantly improving overall performance. Meanwhile, nonlinear energy sinks (NES) are well known for their frequency robustness. The weak point of a nonlinear energy sink lies in its activation threshold, i.e.: the absorber is inactive at low or high levels of external force applied to the primary structure. Additionally, under a significant shift in the primary structure’s natural frequencies, the absorber becomes ineffective or inactive. Furthermore, the reactivity of passive absorbers may be insufficient depending on the application. For these reasons, a new device for vibration mitigation called the hybrid nonlinear energy sink is introduced. The latter is designed to overcome the limitations of passive linear and nonlinear absorbers and hybrid linear absorbers. It enhances the non-linear passive energy sink by integrating sensor-actuator pairs and a specially designed control law to modify the system dynamics in real time. This ensures that the absorber remains effective even when external conditions change. This paper presents theoretical and experimental demonstrations of this new device, applied to a one-storey building. By introducing control laws within the hybrid nonlinear energy sink, it becomes possible to adjust its parameters, e.g., the nonlinear stiffness, to shift the activation threshold and ensure consistent performance of the absorber in real-time.

杂交是一项强大的最新技术，它结合了无源和有源组件来提高系统性能。该方法的核心思想是通过集成执行器/传感器对支持的控制律来提高被动能量吸收机构的响应性和适应性。这种组合使系统能够动态地适应不同的激励条件，从而显着提高整体性能。同时，非线性能量汇（NES）具有频率鲁棒性。非线性能量吸收的弱点在于它的激活阈值，即：吸收器在低或高水平的外力作用于主要结构时不活跃。此外，在主要结构的固有频率发生重大变化的情况下，吸收器变得无效或不活跃。此外，被动吸收剂的反应性可能因应用的不同而不足。基于这些原因，提出了一种新的减振装置——混合非线性能量汇。后者是为了克服被动线性和非线性吸收器以及混合线性吸收器的局限性而设计的。它通过集成传感器-执行器对和特殊设计的控制律来实时修改系统动力学，从而增强非线性无源能量吸收。这确保吸收器即使在外部条件发生变化时仍然有效。本文介绍了这种新装置的理论和实验证明，并应用于一个单层建筑。通过在混合非线性能量吸收器中引入控制规律，可以调整其参数，例如非线性刚度，以移动激活阈值并确保吸收器的实时一致性能。

{"title":"Hybrid nonlinear energy sink, a tunable device for vibration mitigation : Theorical and experimental demonstration","authors":"Louis Mesny , Sébastien Baguet , Roberto Alcorta , Alireza Ture Savadkoohi , Claude-Henri Lamarque , Simon Chesné","doi":"10.1016/j.jsv.2025.119577","DOIUrl":"10.1016/j.jsv.2025.119577","url":null,"abstract":"<div><div>Hybridization is a powerful and recent technology that combines passive and active components to enhance system performance. The central idea behind this approach is to improve the responsiveness and adaptability of the passive energy absorption mechanism by integrating a control law supported by actuator/sensor pairs. This combination enables the system to dynamically adapt itself to varying excitation conditions, thereby significantly improving overall performance. Meanwhile, nonlinear energy sinks (NES) are well known for their frequency robustness. The weak point of a nonlinear energy sink lies in its activation threshold, i.e.: the absorber is inactive at low or high levels of external force applied to the primary structure. Additionally, under a significant shift in the primary structure’s natural frequencies, the absorber becomes ineffective or inactive. Furthermore, the reactivity of passive absorbers may be insufficient depending on the application. For these reasons, a new device for vibration mitigation called the hybrid nonlinear energy sink is introduced. The latter is designed to overcome the limitations of passive linear and nonlinear absorbers and hybrid linear absorbers. It enhances the non-linear passive energy sink by integrating sensor-actuator pairs and a specially designed control law to modify the system dynamics in real time. This ensures that the absorber remains effective even when external conditions change. This paper presents theoretical and experimental demonstrations of this new device, applied to a one-storey building. By introducing control laws within the hybrid nonlinear energy sink, it becomes possible to adjust its parameters, e.g., the nonlinear stiffness, to shift the activation threshold and ensure consistent performance of the absorber in real-time.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119577"},"PeriodicalIF":4.9,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787937","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

Vibration characteristics of integrally mistuned turbine blisks with hard-coating and bladed multi-packet shrouds 整体失谐涡轮硬涂层叶片多包叶冠的振动特性

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-09 DOI: 10.1016/j.jsv.2025.119607

Wensai Ma , Bin Bai , Xiang Li , Xinye Li , Shichuan Wang , Gang Chen

To effectively address vibration issues in aero-engine blisks, this study establishes a lumped parameter dynamic model (LPDM) of mistuned integrally turbine blisk with hard-coating and bladed multi-packet shrouds (MITB-HC-BMPSs), systematically investigating the variation laws of modal and vibration characteristics under different mistuning strengths. There are two configurational models on the LPDM considering blade stiffness mistuning, that is, Style 1 (MITB-HC without BMPSs) and Style 2 (MITB-HC-BMPSs). The BMPSs are introduced to connect adjacent blades, forming coupled groups to enhance inter-blade stiffness coupling. The effects of HC and BMPSs on natural frequencies, modal localization, and resonant responses are analyzed, with solutions validated against existing literature. Results show that mistuning has negligible influence on natural frequencies but significantly induces modal shape and forced response localization, with severity increasing as mistuning strength rises. Notably, the hybrid system of HC and BMPSs demonstrates superior vibration reduction: compared with single measures, it more significantly weakens vibration localization. The HC reduces system stiffness and dissipates vibrational energy, while BMPSs enhance structural coupling to mitigate stiffness heterogeneity. This study furnishes both theoretical foundation and engineering guidance for the vibration-damping optimization design of ITB with composite material structures in aero-engines.

为有效解决航空发动机叶片振动问题，建立了硬涂层多包叶冠失谐整体涡轮叶片（MITB-HC-BMPSs）的总参数动力学模型（LPDM），系统研究了不同失谐强度下的模态和振动特性变化规律。考虑叶片刚度失谐的ldm有两种构型模型，即1型（MITB-HC不带bmps）和2型（MITB-HC- bmps）。引入bmps连接相邻叶片，形成耦合组，增强叶片间刚度耦合。分析了HC和bmps对固有频率、模态局部化和共振响应的影响，并根据现有文献验证了解决方案。结果表明，失谐对固有频率的影响可以忽略不计，但会显著诱导模态振型和强迫响应局部化，且随失谐强度的增加，影响程度逐渐增大。值得注意的是，HC和bmps的混合系统具有更好的减振效果：与单一措施相比，它更明显地减弱了振动的局部化。HC降低了系统刚度并耗散了振动能量，而bmps增强了结构耦合以减轻刚度非均匀性。本文的研究为航空发动机复合材料结构ITB减振优化设计提供了理论基础和工程指导。

{"title":"Vibration characteristics of integrally mistuned turbine blisks with hard-coating and bladed multi-packet shrouds","authors":"Wensai Ma , Bin Bai , Xiang Li , Xinye Li , Shichuan Wang , Gang Chen","doi":"10.1016/j.jsv.2025.119607","DOIUrl":"10.1016/j.jsv.2025.119607","url":null,"abstract":"<div><div>To effectively address vibration issues in aero-engine blisks, this study establishes a lumped parameter dynamic model (LPDM) of mistuned integrally turbine blisk with hard-coating and bladed multi-packet shrouds (MITB-HC-BMPSs), systematically investigating the variation laws of modal and vibration characteristics under different mistuning strengths. There are two configurational models on the LPDM considering blade stiffness mistuning, that is, Style 1 (MITB-HC without BMPSs) and Style 2 (MITB-HC-BMPSs). The BMPSs are introduced to connect adjacent blades, forming coupled groups to enhance inter-blade stiffness coupling. The effects of HC and BMPSs on natural frequencies, modal localization, and resonant responses are analyzed, with solutions validated against existing literature. Results show that mistuning has negligible influence on natural frequencies but significantly induces modal shape and forced response localization, with severity increasing as mistuning strength rises. Notably, the hybrid system of HC and BMPSs demonstrates superior vibration reduction: compared with single measures, it more significantly weakens vibration localization. The HC reduces system stiffness and dissipates vibrational energy, while BMPSs enhance structural coupling to mitigate stiffness heterogeneity. This study furnishes both theoretical foundation and engineering guidance for the vibration-damping optimization design of ITB with composite material structures in aero-engines.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119607"},"PeriodicalIF":4.9,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787996","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

Quantification of structural damage by harnessing the principle of local force continuity 利用局部力连续原理对结构损伤进行量化

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-09 DOI: 10.1016/j.jsv.2025.119604

Yuting Yang , Yu’e Ma , Linfeng Li , Li Cheng , Xiang Yu

Quantitative assessment of damage severity is important for maintaining and extending the service life of engineering structures. Traditional vibration-based methods often face challenges such as low sensitivity, strong dependence on structural details and excitation signals, and the need for global models or baseline signals. The recently developed Pseudo Excitation (PE) method enables the detection of local structural damage by utilizing high-order spatial derivatives of the measured displacement data, easing some of these constraints. However, the PE method can only pinpoint the presence of damage and outline its boundaries; it currently lacks the ability to quantify the damage severity or the profile of the damaged area. To address these limitations, this study proposes a novel damage quantification approach, referred to as Local Force Continuity (LFC) method, based on the continuity principle of local internal forces. By examining the force continuity relations near the damage boundary, we establish a correlation between the damage severity and the measured vibration responses, enabling a quantitative characterization of the damage profile. The proposed approach is first validated through numerical simulations, showcasing its remarkable ability in locating damage and identifying its shape. The effects of damage extents, excitation frequency and structural boundary conditions are systematically investigated, highlighting the effectiveness and robustness of the proposed method. Finally, experimental verification is conducted using laser doppler vibrometer (LDV) scanning. Results demonstrate that the LFC method can effectively assess damage severity. The LFC method not only retains the advantages of the PE method, but also significantly extends its capabilities in damage quantification, providing new physical insights and broadening its potential applications in related engineering fields.

损伤严重程度的定量评估对工程结构的维护和延长使用寿命具有重要意义。传统的基于振动的方法往往面临灵敏度低、对结构细节和激励信号依赖性强、需要全局模型或基线信号等挑战。最近开发的伪激励（PE）方法通过利用测量位移数据的高阶空间导数来检测局部结构损伤，从而缓解了这些限制。然而，PE方法只能精确定位损伤的存在并勾勒出其边界；它目前缺乏量化损害严重程度或受损区域概况的能力。针对这些局限性，本研究提出了一种基于局部内力连续性原理的损伤量化方法——局部力连续性法（LFC）。通过检查损伤边界附近的力连续性关系，我们建立了损伤严重程度与测量振动响应之间的相关性，从而能够定量表征损伤剖面。通过数值模拟验证了该方法在损伤定位和损伤形状识别方面的卓越能力。系统地研究了损伤程度、激励频率和结构边界条件的影响，突出了所提出方法的有效性和鲁棒性。最后，用激光多普勒测振仪（LDV）扫描进行了实验验证。结果表明，LFC方法可以有效地评估损伤程度。LFC方法不仅保留了PE方法的优点，而且大大扩展了其损伤量化能力，提供了新的物理见解，拓宽了其在相关工程领域的潜在应用。

{"title":"Quantification of structural damage by harnessing the principle of local force continuity","authors":"Yuting Yang , Yu’e Ma , Linfeng Li , Li Cheng , Xiang Yu","doi":"10.1016/j.jsv.2025.119604","DOIUrl":"10.1016/j.jsv.2025.119604","url":null,"abstract":"<div><div>Quantitative assessment of damage severity is important for maintaining and extending the service life of engineering structures. Traditional vibration-based methods often face challenges such as low sensitivity, strong dependence on structural details and excitation signals, and the need for global models or baseline signals. The recently developed Pseudo Excitation (PE) method enables the detection of local structural damage by utilizing high-order spatial derivatives of the measured displacement data, easing some of these constraints. However, the PE method can only pinpoint the presence of damage and outline its boundaries; it currently lacks the ability to quantify the damage severity or the profile of the damaged area. To address these limitations, this study proposes a novel damage quantification approach, referred to as Local Force Continuity (LFC) method, based on the continuity principle of local internal forces. By examining the force continuity relations near the damage boundary, we establish a correlation between the damage severity and the measured vibration responses, enabling a quantitative characterization of the damage profile. The proposed approach is first validated through numerical simulations, showcasing its remarkable ability in locating damage and identifying its shape. The effects of damage extents, excitation frequency and structural boundary conditions are systematically investigated, highlighting the effectiveness and robustness of the proposed method. Finally, experimental verification is conducted using laser doppler vibrometer (LDV) scanning. Results demonstrate that the LFC method can effectively assess damage severity. The LFC method not only retains the advantages of the PE method, but also significantly extends its capabilities in damage quantification, providing new physical insights and broadening its potential applications in related engineering fields.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119604"},"PeriodicalIF":4.9,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880975","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

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 : 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。

{"title":"Nonlinear dynamics of a piezoelectric wind energy harvester by exploiting vortex-induced vibration","authors":"Kang Lu, Xiong Xiong, Zheng Zeng, Zichen Deng, Rongchun Hu","doi":"10.1016/j.jsv.2025.119605","DOIUrl":"10.1016/j.jsv.2025.119605","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119605"},"PeriodicalIF":4.9,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787995","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

Comprehensive multiphysics model of an induction motor for generating synthetic data under diverse bearing faulty conditions 异步电动机不同轴承故障条件下综合数据生成的综合多物理场模型

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-07 DOI: 10.1016/j.jsv.2025.119603

Dayeon Jeong , Seho Son , Kyung Ho Sun , Byeong Chan Jeon , Seung Hwan Lee , Ki-Yong Oh

This study proposes a comprehensive multiphysics model for an induction motor (IM) that can generate high-fidelity synthetic fault data to mitigate data scarcity in data-driven fault-detection methods. The proposed model integrates three physical characteristics to replicate bearing faults. First, a two-dimensional electromagnetic model calculates the electromagnetic force based on the magnetic flux density. Second, a three-dimensional structural dynamic model generates dynamic responses of the IM under various health conditions. Finally, a bearing model calculates bearing forces while considering ball deformation to replicate outer-race, inner-race, ball, and mixed faults. Subsequently, the bearing forces are fed back into the structural dynamic model, thus ensuring accurate dynamic response replication. Extensive validation through experiments under different bearing failure modes demonstrates the accuracy of the model in replicating IM dynamics with varying fault severities. This capability highlights the potential of the model in generating high-fidelity synthetic fault data for fault detection methods.

本研究提出了一种综合的感应电机多物理场模型，该模型可以生成高保真的综合故障数据，以缓解数据驱动故障检测方法中的数据稀缺性。该模型集成了三个物理特征来复制轴承故障。首先，建立二维电磁模型，根据磁通密度计算电磁力。其次，建立三维结构动力模型，生成不同健康状态下的动态响应。最后，在考虑球变形的情况下，计算轴承力模型，以复制外圈、内圈、球和混合故障。随后，将轴承受力反馈到结构动力模型中，从而保证了准确的动力响应复制。通过不同轴承失效模式下的大量实验验证，证明了该模型在复制不同故障严重程度的IM动力学方面的准确性。这种能力突出了该模型在为故障检测方法生成高保真综合故障数据方面的潜力。

{"title":"Comprehensive multiphysics model of an induction motor for generating synthetic data under diverse bearing faulty conditions","authors":"Dayeon Jeong , Seho Son , Kyung Ho Sun , Byeong Chan Jeon , Seung Hwan Lee , Ki-Yong Oh","doi":"10.1016/j.jsv.2025.119603","DOIUrl":"10.1016/j.jsv.2025.119603","url":null,"abstract":"<div><div>This study proposes a comprehensive multiphysics model for an induction motor (IM) that can generate high-fidelity synthetic fault data to mitigate data scarcity in data-driven fault-detection methods. The proposed model integrates three physical characteristics to replicate bearing faults. First, a two-dimensional electromagnetic model calculates the electromagnetic force based on the magnetic flux density. Second, a three-dimensional structural dynamic model generates dynamic responses of the IM under various health conditions. Finally, a bearing model calculates bearing forces while considering ball deformation to replicate outer-race, inner-race, ball, and mixed faults. Subsequently, the bearing forces are fed back into the structural dynamic model, thus ensuring accurate dynamic response replication. Extensive validation through experiments under different bearing failure modes demonstrates the accuracy of the model in replicating IM dynamics with varying fault severities. This capability highlights the potential of the model in generating high-fidelity synthetic fault data for fault detection methods.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119603"},"PeriodicalIF":4.9,"publicationDate":"2025-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787997","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

An iterative tension-based transfer matrix method for dynamic analysis of periodic cables 基于迭代张力传递矩阵法的周期索动力分析

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-06 DOI: 10.1016/j.jsv.2025.119601

He Zhang, Yihui Guo, Tengxin Lin, Linjie Yao, Yuhui Zhou

Periodic structure-based vibration control has emerged as a novel strategy for engineering structures, yet its implementation in cable systems faces critical analytical challenges. In this study, we propose an updated Transfer Matrix (TM) methodology that resolves two fundamental limitations in existing approaches: (1) modeling inaccuracies caused by discontinuities in non-uniform cables, and (2) the failure of conventional TM methods due to deformation-dependent transfer matrices. To resolve the first limitation, a segmented catenary element method is proposed, integrating the State-Space Approach (SSA) with the catenary element method. This framework enables the discretization of periodic cable systems into uniform segments, each governed analytically by the hyperbolic equilibrium equations derived from catenary theory. For the second limitation, explicit equations relating transfer matrices to dynamic tension are first derived; then an iterative dynamic tension approach is developed to update the deformation-dependent transfer matrices. By employing the Joint Coupling Matrix (JCM) method to construct the global transfer matrix, the closed-form solution for the vibration responses can be derived. The accuracy of the updated TM method is verified through comparisons between frequency response curves obtained from the updated TM method and those from the Finite Element Method (FEM). The updated TM method is then employed to evaluate the performance of the periodic structure-based vibration mitigation strategy in periodic cable systems, revealing the effectiveness of this approach under different combinations of structural periodic parameters and load conditions. The results provide a theoretical foundation and practical guidance for optimizing periodic cable configurations to achieve enhanced vibration mitigation performance in civil engineering applications.

基于周期性结构的振动控制已成为工程结构的一种新策略，但其在索系统中的实施面临着严峻的分析挑战。在本研究中，我们提出了一种更新的传递矩阵（TM）方法，该方法解决了现有方法的两个基本局限性：(1)非均匀电缆的不连续引起的建模不准确性；(2)由于变形相关的传递矩阵而导致传统的TM方法失效。针对第一个局限性，提出了一种将状态空间法与接触网元法相结合的分段接触网元方法。该框架使周期电缆系统离散成均匀的部分，每个部分由从悬链线理论导出的双曲平衡方程解析控制。对于第二个限制，首先推导了传递矩阵与动态张力的显式方程；然后提出了一种迭代动态张力法来更新变形相关传递矩阵。采用联合耦合矩阵（JCM）法构造整体传递矩阵，推导出振动响应的封闭解。通过与有限元法得到的频率响应曲线的比较，验证了改进后的TM法的精度。利用改进后的TM方法，对周期性索系的周期性结构减振策略进行了性能评估，揭示了该方法在不同结构周期参数和荷载条件组合下的有效性。研究结果为优化周期拉索结构以提高土木工程中的减振性能提供了理论基础和实践指导。

{"title":"An iterative tension-based transfer matrix method for dynamic analysis of periodic cables","authors":"He Zhang, Yihui Guo, Tengxin Lin, Linjie Yao, Yuhui Zhou","doi":"10.1016/j.jsv.2025.119601","DOIUrl":"10.1016/j.jsv.2025.119601","url":null,"abstract":"<div><div>Periodic structure-based vibration control has emerged as a novel strategy for engineering structures, yet its implementation in cable systems faces critical analytical challenges. In this study, we propose an updated Transfer Matrix (TM) methodology that resolves two fundamental limitations in existing approaches: (1) modeling inaccuracies caused by discontinuities in non-uniform cables, and (2) the failure of conventional TM methods due to deformation-dependent transfer matrices. To resolve the first limitation, a segmented catenary element method is proposed, integrating the State-Space Approach (SSA) with the catenary element method. This framework enables the discretization of periodic cable systems into uniform segments, each governed analytically by the hyperbolic equilibrium equations derived from catenary theory. For the second limitation, explicit equations relating transfer matrices to dynamic tension are first derived; then an iterative dynamic tension approach is developed to update the deformation-dependent transfer matrices. By employing the Joint Coupling Matrix (JCM) method to construct the global transfer matrix, the closed-form solution for the vibration responses can be derived. The accuracy of the updated TM method is verified through comparisons between frequency response curves obtained from the updated TM method and those from the Finite Element Method (FEM). The updated TM method is then employed to evaluate the performance of the periodic structure-based vibration mitigation strategy in periodic cable systems, revealing the effectiveness of this approach under different combinations of structural periodic parameters and load conditions. The results provide a theoretical foundation and practical guidance for optimizing periodic cable configurations to achieve enhanced vibration mitigation performance in civil engineering applications.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119601"},"PeriodicalIF":4.9,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837274","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

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 : 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。

{"title":"Sound radiation from circular duct with inflow","authors":"Wang Liwei, Fan Yiliang, Ji Zhenlin","doi":"10.1016/j.jsv.2025.119602","DOIUrl":"10.1016/j.jsv.2025.119602","url":null,"abstract":"<div><div>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 (<em>ka</em>) 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 <em>ka</em> 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.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119602"},"PeriodicalIF":4.9,"publicationDate":"2025-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787994","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

Accounting for dielectric losses in piezoelectric shunt tuning 压电分流调谐中介电损耗的计算

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-05 DOI: 10.1016/j.jsv.2025.119598

Jens D. Richardt , Boris Lossouarn , Jan Høgsberg , Jean-François Deü

Effective vibration reduction of mechanical structures by piezoelectric shunt damping requires a precise design of the electrical shunt circuit. In this context, the influence of dielectric losses on the accuracy of shunt calibration is analyzed. Numerical analysis of an SDOF structure shows that dielectric losses can result in a significantly increased vibration amplitude when not accounted for in the calibration of a resonant shunt. To address this, a new correction method based on impedance matching is proposed, enabling the use of existing tuning expressions not accounting for dielectric losses. It is demonstrated numerically and experimentally that the influence of dielectric losses is more pronounced for low electromechanical coupling factors. The proposed correction method is shown to provide an accurate correction for the influence of dielectric losses on the shunt tuning.

利用压电并联阻尼实现机械结构的有效减振，需要精确设计并联电路。在此背景下，分析了介电损耗对分流校准精度的影响。对SDOF结构的数值分析表明，在谐振分流器的校准中，如果不考虑介质损耗，会导致振动幅值的显著增加。为了解决这个问题，提出了一种新的基于阻抗匹配的校正方法，可以使用现有的不考虑介电损耗的调谐表达式。数值和实验结果表明，当机电耦合系数较低时，介质损耗的影响更为明显。所提出的校正方法对介电损耗对分流调谐的影响提供了精确的校正。

引用次数: 0

Sommerfeld effect of non-ideal double-body vibration system driven by AC motor 交流电机驱动非理想双体振动系统的索默菲尔德效应

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-05 DOI: 10.1016/j.jsv.2025.119573

Xiaozhe Chen , Baitong Zhou , Vladislav Sorokin

In this paper, the Sommerfeld effect in a non-ideal vibrational system with two degrees of freedom driven by an AC motor is investigated. The interaction between the AC motor and the vibration system is explored, leading to the development of a dynamical model and the establishment of the governing differential equations of motion. Subsequently, the motion coupling is considered by the analysis of the electromagnetic torque of the AC motor. The first-order approximate solution of the equations is then obtained by using the averaging method, and the torque balance equation is derived. Based on this torque balance condition, the characteristics of the Sommerfeld effect in the system are analyzed. The existence of multiple steady-state motions in the system is confirmed by experimental results for both sweep and fixed-frequency excitations, which are supported by the theoretical analysis. Furthermore, the occurrence of the Sommerfeld effect is identified through the parameters of the AC motor, which are monitored by the programmable logic controller. It is noted that in engineering applications, the electrical input and unbalanced mass of the AC motor can be utilized for the suppression of the Sommerfeld effect in vibrating systems.

本文研究了由交流电机驱动的非理想二自由度振动系统中的索默菲尔德效应。探讨了交流电机与振动系统之间的相互作用，建立了交流电机的动力学模型并建立了控制运动微分方程。然后，通过分析交流电机的电磁转矩，考虑了运动耦合。然后用平均法求出方程的一阶近似解，推导出力矩平衡方程。在此转矩平衡条件下，分析了系统中索默菲尔德效应的特性。扫描激励和定频激励的实验结果证实了系统中存在多重稳态运动，理论分析也支持了这一结论。此外，通过交流电机的参数来识别索默菲尔德效应的发生，并由可编程逻辑控制器监控这些参数。值得注意的是，在工程应用中，交流电机的电输入和不平衡质量可用于抑制振动系统中的索默菲尔德效应。

{"title":"Sommerfeld effect of non-ideal double-body vibration system driven by AC motor","authors":"Xiaozhe Chen , Baitong Zhou , Vladislav Sorokin","doi":"10.1016/j.jsv.2025.119573","DOIUrl":"10.1016/j.jsv.2025.119573","url":null,"abstract":"<div><div>In this paper, the Sommerfeld effect in a non-ideal vibrational system with two degrees of freedom driven by an AC motor is investigated. The interaction between the AC motor and the vibration system is explored, leading to the development of a dynamical model and the establishment of the governing differential equations of motion. Subsequently, the motion coupling is considered by the analysis of the electromagnetic torque of the AC motor. The first-order approximate solution of the equations is then obtained by using the averaging method, and the torque balance equation is derived. Based on this torque balance condition, the characteristics of the Sommerfeld effect in the system are analyzed. The existence of multiple steady-state motions in the system is confirmed by experimental results for both sweep and fixed-frequency excitations, which are supported by the theoretical analysis. Furthermore, the occurrence of the Sommerfeld effect is identified through the parameters of the AC motor, which are monitored by the programmable logic controller. It is noted that in engineering applications, the electrical input and unbalanced mass of the AC motor can be utilized for the suppression of the Sommerfeld effect in vibrating systems.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119573"},"PeriodicalIF":4.9,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145787936","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

Identification of acoustic modes in non-uniform cylindrical ducts with slowly varying diameters 直径缓慢变化的非均匀圆柱形管道中声模态的识别

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-12-04 DOI: 10.1016/j.jsv.2025.119599

Jianqiang Pan , Leyan Yang , Fei Qi , Pengfei Zou , Liangliang Xu , Weikang Jiang

Identification of azimuthal and radial modes in non-uniform cylindrical ducts with varying diameters is crucial for investigating noise reduction and combustion instability in aero-engines or gas turbines. However, conventional mode identification techniques face difficulties in establishing the observation matrix coefficients that arise from variations in the duct diameter. To address this issue, a methodology based on the Wentzel–Kramers–Brillouin approximation is proposed to accomplish the mode identification and reconstruction of the sound field in the cylindrical duct with varying diameters. It provides the amplitude and phase variation rules of its observation coefficients in the axial direction while preserving the orthogonality of the mode basis functions. The effects of turning points and mode scattering are considered, and guidelines for applying the new method are established. It is verified by simulation using inputs of dominant higher-order radial modes. The results demonstrate a high signal-to-noise ratio while effectively analyzing the impacts of microphone array configuration, cut-on modes selection, and the setting of observation matrix coefficients. Experimental results show that the reconstructed sound field matches the sound field measured by microphones. This validates the effectiveness of the proposed method and highlights its promising potential in engineering applications.

在研究航空发动机或燃气轮机的降噪和燃烧不稳定性时，确定变直径非均匀圆柱形管道的方位模态和径向模态是至关重要的。然而，传统的模式识别技术在建立由管道直径变化引起的观测矩阵系数方面面临困难。为了解决这一问题，提出了一种基于Wentzel-Kramers-Brillouin近似的方法来实现变直径圆柱形管道内声场的模态识别和重构。在保持模态基函数正交性的同时，给出了其观测系数在轴向上的幅值和相位变化规律。考虑了拐点和模式散射的影响，建立了新方法的应用准则。利用高阶径向模态的主导输入进行了仿真验证。结果表明，在有效分析传声器阵列配置、导通模式选择和观测矩阵系数设置影响的同时，具有较高的信噪比。实验结果表明，重建的声场与传声器测得的声场相匹配。这验证了该方法的有效性，并突出了其在工程应用中的良好潜力。

{"title":"Identification of acoustic modes in non-uniform cylindrical ducts with slowly varying diameters","authors":"Jianqiang Pan , Leyan Yang , Fei Qi , Pengfei Zou , Liangliang Xu , Weikang Jiang","doi":"10.1016/j.jsv.2025.119599","DOIUrl":"10.1016/j.jsv.2025.119599","url":null,"abstract":"<div><div>Identification of azimuthal and radial modes in non-uniform cylindrical ducts with varying diameters is crucial for investigating noise reduction and combustion instability in aero-engines or gas turbines. However, conventional mode identification techniques face difficulties in establishing the observation matrix coefficients that arise from variations in the duct diameter. To address this issue, a methodology based on the Wentzel–Kramers–Brillouin approximation is proposed to accomplish the mode identification and reconstruction of the sound field in the cylindrical duct with varying diameters. It provides the amplitude and phase variation rules of its observation coefficients in the axial direction while preserving the orthogonality of the mode basis functions. The effects of turning points and mode scattering are considered, and guidelines for applying the new method are established. It is verified by simulation using inputs of dominant higher-order radial modes. The results demonstrate a high signal-to-noise ratio while effectively analyzing the impacts of microphone array configuration, cut-on modes selection, and the setting of observation matrix coefficients. Experimental results show that the reconstructed sound field matches the sound field measured by microphones. This validates the effectiveness of the proposed method and highlights its promising potential in engineering applications.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"625 ","pages":"Article 119599"},"PeriodicalIF":4.9,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145734764","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