Journal of Sound and Vibration最新文献

Optimizing design of openings in vibrating plates for enhanced vibro-acoustic performance using a genetic algorithm approach 利用遗传算法优化振动板开口设计，提高振动声学性能

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-25 DOI: 10.1016/j.jsv.2024.118847

Khaled Said Ahmed Maamoun , Stanislaw Wrona , Marek Pawelczyk , Hamid Reza Karimi

Optimizing structural openings in vibro-acoustic systems is essential for balancing functional needs with acoustic performance in various engineering applications. This paper presents an efficient optimization approach for designing openings in plate structures within vibro-acoustic systems, aimed at enhancing acoustic performance while maintaining structural integrity. A genetic algorithm framework is developed to determine the optimal shapes and locations of openings simultaneously, utilizing an analytical model based on hyperbolic and trigonometric admissible functions within a master–slave software architecture. The proposed method accommodates a variety of opening requirements for different systems and employs a cost function that evaluates both the average and peaks of sound power responses to identify the designs with the highest fitness. This results in significant reductions in sound power levels compared to median and worst-case designs. Additionally, the method analyzes how variations in opening locations, numbers, and shapes impact acoustic performance, providing guidance for opening designs that avoid undesired acoustic outcomes and improve noise barrier performance in vibro-acoustic systems.

优化振动声学系统中的结构开口对于平衡各种工程应用中的功能需求和声学性能至关重要。本文介绍了振动声学系统中板结构开口设计的高效优化方法，旨在提高声学性能的同时保持结构的完整性。本文开发了一种遗传算法框架，利用主从软件架构中基于双曲线和三角函数的分析模型，同时确定开口的最佳形状和位置。所提出的方法可满足不同系统的各种开口要求，并采用一种成本函数来评估声功率响应的平均值和峰值，以确定适应度最高的设计。这样，与中位设计和最坏情况设计相比，声功率水平明显降低。此外，该方法还分析了开孔位置、数量和形状的变化对声学性能的影响，为开孔设计提供指导，以避免出现不期望的声学结果，并改善振动声学系统中的隔音屏障性能。

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引用次数: 0

Modelling the effective sound propagation properties of a hexagonal acoustic metamaterial using a dissipative equivalent-fluid approach under different termination conditions 利用耗散等效流体方法模拟不同终止条件下六边形声超材料的有效声传播特性

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-19 DOI: 10.1016/j.jsv.2024.118855

Denilson Ramos , Francesco Pompoli , Cristina Marescotti , Luís Godinho , Paulo Amado-Mendes , Paulo Mareze

This paper presents a theoretical approach to assess the effective sound propagation properties of an acoustic system comprising multiple subwavelength resonators under grazing incidence. Consequently, the high capacity required to handle sound transmission, absorption and reflection are theoretically and experimentally reported. Viscothermal effects are considered by employing the dissipative equivalent-fluid approach and the respective analytical estimations of transport parameters provide accuracy in describing the resistive and reactive phenomena in the acoustic field for different termination conditions. The dissipative equivalent-fluid approach proposed here is contrasted with other well-established methods and numerical computing. The results evidence good agreement even when multiple resonances are associated, enabling the implementation of single, dual and triple resonance systems. The results of this work present a validated simplified approach that provides analytical derivations of the effective sound propagation properties in a complex association of side-branches Helmholtz resonators.

本文提出了一种理论方法，用于评估由多个亚波长谐振器组成的声学系统在掠入射条件下的有效声传播特性。因此，理论和实验报告了处理声音传播、吸收和反射所需的高容量。采用耗散等效流体方法考虑了粘热效应，并对传输参数进行了相应的分析估算，从而准确地描述了不同终止条件下声场中的阻力和反应现象。本文提出的耗散等效流体方法与其他成熟的方法和数值计算方法进行了对比。结果表明，即使在多个共振相关联的情况下，也能取得良好的一致性，从而实现单共振、双共振和三共振系统。这项工作的成果提出了一种经过验证的简化方法，可对侧枝亥姆霍兹谐振器复杂关联中的有效声传播特性进行分析推导。

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引用次数: 0

Broadband vibration reduction of cylindrical shell structures with circumferential taper scatters 利用圆周锥面散射减少圆柱形壳体结构的宽带振动

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-19 DOI: 10.1016/j.jsv.2024.118853

Sen Zhang , Liangzhu Ding , Xinwei Wu , Yongbin Ma , Zichen Deng

In this study, circumferential taper wedges are proposed to reduce broadband vibrations reduction in a circular cylindrical shell. The structural damping characteristics and vibration response of the circular cylindrical shell with circumferential taper wedges are analyzed based on an analytical wave propagation model developed using the symplectic method. The taper wedge is segmented uniformly using a Gaussian discretization method based on the power law, which effectively addresses the non-uniformity of the taper wedge. Meanwhile, the amplitude of each uniform segment is evaluated using the analytical wave propagation model. The accuracy and effectiveness of the homogenization approximation of the analytical model are validated using the finite-element method. Additionally, the forced vibration response and damping characteristics of the circular cylindrical shell, which incorporate both uniform and taper wedges under various boundary conditions, are investigated. The results show that compared with a uniform wedge, the taper wedge provides greater damping, i.e., up to six the damping afforded by a uniform wedge. Despite the relatively short length of the taper wedge, the latter can achieve significant broadband vibration suppression in the host circular cylindrical shell. Additionally, under any boundary condition, the taper wedge can reduce broadband vibrations in the circular cylindrical shell. Finally, the distance between the excitation source and taper wedge significantly affects the vibration attenuation in the circular cylindrical shell.

本研究提出了圆周锥楔来减少圆柱形外壳的宽带振动。根据使用交点法建立的波传播分析模型，分析了带有圆周锥楔的圆柱形壳体的结构阻尼特性和振动响应。锥楔采用基于幂律的高斯离散化方法进行均匀分割，从而有效地解决了锥楔的非均匀性问题。同时，利用解析波传播模型评估了每个均匀段的振幅。使用有限元方法验证了分析模型匀化近似的准确性和有效性。此外，还研究了圆柱形壳体在各种边界条件下的受迫振动响应和阻尼特性，其中包括均匀楔块和锥形楔块。结果表明，与均匀楔块相比，锥形楔块能提供更大的阻尼，即达到均匀楔块阻尼的六倍。尽管锥形楔块的长度相对较短，但后者能在主圆柱形壳体中实现显著的宽带振动抑制。此外，在任何边界条件下，锥楔都能减少圆柱形外壳的宽带振动。最后，激励源与锥楔之间的距离对圆柱形外壳的振动衰减有很大影响。

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引用次数: 0

Dynamically amplified whirling string actuator 动态放大旋弦传动器

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-17 DOI: 10.1016/j.jsv.2024.118826

Igor Berinskii, Slava Krylov

This work introduces a simple, dynamically amplified mechanical actuator incorporating a whirling string (or beam) as an active element. One of the ends of the string is fixed, while another is connected to an elastic spring. The operational principle of the device is based on the nonlinear coupling between the string’s lateral (radial) deflection rotating around the string’s axis and the axial displacement of the string’s end. Such a system may demonstrate a significant mechanical advantage between the force needed to sustain the rotation and the axial force at the string’s end.

这项研究介绍了一种简单的动态放大机械致动器，它将一根旋转的弦（或梁）作为主动元件。弦的一端固定，另一端与弹性弹簧相连。该装置的工作原理基于绕弦轴旋转的弦侧向（径向）挠度与弦端轴向位移之间的非线性耦合。这种系统可以在维持旋转所需的力与弦端轴向力之间显示出明显的机械优势。

引用次数: 0

Investigation of an Impact-buffered Viscous Damper: A new mechanical model, experiments, and numerical simulations 冲击缓冲粘滞阻尼器的研究：新机械模型、实验和数值模拟

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-17 DOI: 10.1016/j.jsv.2024.118852

Yifei Zhang , Yong Ding , Guoshan Xu

This paper introduces a new mechanical model and presents experimental investigations for impact-buffered viscous dampers (IBVDs). A multi-degree-of-freedom bridge system is employed for numerical analysis, investigating the vibration control and impact characteristics of IBVDs. The experimental results closely align with theoretical predictions, with errors of 4.33 % for maximum positive force and 6.73 % for energy dissipation. When the displacement amplitude is greater than or equal to 6 mm, the equivalent viscous damping ratio of the IBVD decreases with the displacement amplitude. Numerical simulations show that IBVDs reduce the maximum acceleration of the girder and the maximum impact force by 20 % and 24 %, respectively. Compared to conventional viscous dampers, IBVDs demonstrate superior vibration control in terms of base shear and girder displacement. An appropriately designed IBVD can dissipate energy comparably to a conventional viscous damper during design-basis earthquakes while also providing enhanced cushioning against sudden collisions in more severe earthquakes.

本文介绍了一种新的机械模型，并对冲击缓冲粘性阻尼器（IBVDs）进行了实验研究。采用多自由度桥梁系统进行数值分析，研究了 IBVD 的振动控制和冲击特性。实验结果与理论预测非常吻合，最大正向力误差为 4.33%，能量耗散误差为 6.73%。当位移振幅大于或等于 6 毫米时，IBVD 的等效粘性阻尼比随位移振幅的增大而减小。数值模拟显示，IBVD 可将大梁的最大加速度和最大冲击力分别降低 20% 和 24%。与传统的粘性阻尼器相比，IBVD 在基底剪切力和大梁位移方面表现出卓越的振动控制能力。在设计基准地震中，设计合理的 IBVD 的消能效果可与传统的粘性阻尼器相媲美，同时还能在更严重的地震中提供更强的缓冲作用，防止突然发生的碰撞。

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引用次数: 0

Evolution of modal properties in the non-proportionally damped coupled vehicle–bridge system 非比例阻尼耦合车桥系统的模态特性演变

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-17 DOI: 10.1016/j.jsv.2024.118803

Shiyi Mei , Daniel Cantero , Colin Caprani

The modal properties of bridges are crucial parameters in engineering applications, and their variation caused by moving vehicles has been increasingly recognized in recent years. However, existing closed-form analytical expressions for the varying modal properties during vehicle passage exist only for simple structural configurations. This paper proposes an innovative method for analyzing the instantaneous modal properties of the system, considering general boundary conditions and the damping effect. First, only general boundary conditions are considered, and the results show that the location of the maximum system frequency shift depends on the mode shape. Then the damping effect is considered, observing that the system is non-proportionally damped in most cases, making it difficult to obtain a closed-form solution using existing methods. To solve this, we transform the system of second-order ordinary differential equations into a set of fourth-order ordinary differential equations and derive the closed-form solution for system’s modal properties. Based on this solution, we introduce the concept of Critical Coupling Damping (CCD), which defines the transition between the coupled description and the moving mass case. This work deepens understanding of changing modal properties during the traverse of sprung masses, and so has numerous potential engineering applications.

桥梁的模态特性是工程应用中的关键参数，近年来，人们越来越认识到移动车辆对其造成的影响。然而，现有的车辆通过时模态特性变化的闭式分析表达式仅适用于简单的结构配置。本文提出了一种分析系统瞬时模态特性的创新方法，同时考虑了一般边界条件和阻尼效应。首先，只考虑一般边界条件，结果表明系统最大频移的位置取决于模态形状。然后考虑阻尼效应，观察到系统在大多数情况下是非比例阻尼的，这使得使用现有方法难以获得闭式解。为了解决这个问题，我们将二阶常微分方程系统转化为一组四阶常微分方程，并推导出系统模态特性的闭式解。在此解的基础上，我们引入了临界耦合阻尼（CCD）的概念，它定义了耦合描述和移动质量情况之间的过渡。这项研究加深了人们对弹簧质量移动过程中模态特性变化的理解，因此在工程应用中具有巨大潜力。

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引用次数: 0

Enhancing gearbox fault diagnosis under phase estimation errors: A dynamic time warping and blind deconvolution approach 加强相位估计误差下的齿轮箱故障诊断：动态时间扭曲和盲解卷方法

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-17 DOI: 10.1016/j.jsv.2024.118851

Taehyung Kim , Jongmin Park , Jinoh Yoo , Jong Moon Ha , Byeng D. Youn

The blind deconvolution technique is widely used to extract subtle fault-related features from the noisy vibration signals of rotating machinery. However, utilizing conventional Minimum Entropy Deconvolution (MED) methods is challenging for analyzing gearboxes, where significant internal and external non-Gaussian disturbance signals are inherent. Although periodicity analysis with signal alignment can be employed to solve this challenge, most available methods require exact phase information for the signals; this must be measured by a specially installed encoder system. To address this issue, this paper introduces a novel method for the fault diagnosis of gearboxes that effectively addresses the significant challenge of extracting periodic fault characteristics from noisy vibration signals, particularly in scenarios characterized by significant phase estimation errors and without the need for an encoder system. By combining the strengths of blind deconvolution with Dynamic Time Warping (DTW)-based sequential signal alignment, our method facilitates the identification and alignment of samples with identical rotational phases. This approach enables the distinction between impulsive features caused by faults and those resulting from noise, thus overcoming the limitations of conventional techniques, which fail to extract periodic fault characteristics under phase estimation errors. The effectiveness of the proposed approach is verified through analytic simulation and experimental validation using data from 2-kW planetary gearbox testbeds at Seoul National University (SNU) and the Korea Research Institute of Standards and Science (KRISS). Results demonstrate the superiority of the proposed method for identifying fault conditions under significant phase estimation errors compared to conventional methods.

盲解卷技术被广泛用于从旋转机械的噪声振动信号中提取与故障相关的微妙特征。然而，利用传统的最小熵解卷积 (MED) 方法分析齿轮箱具有挑战性，因为齿轮箱本身存在大量内部和外部非高斯干扰信号。虽然可以采用信号对齐的周期性分析来解决这一难题，但大多数现有方法都需要信号的精确相位信息；这必须通过专门安装的编码器系统来测量。为解决这一问题，本文介绍了一种用于齿轮箱故障诊断的新方法，它能有效解决从噪声振动信号中提取周期性故障特征这一重大挑战，尤其是在相位估计误差较大的情况下，而且无需编码器系统。我们的方法结合了盲解卷积和基于动态时间扭曲（DTW）的信号顺序对齐的优势，有助于识别和对齐具有相同旋转相位的样本。这种方法能够区分故障引起的脉冲特征和噪声引起的脉冲特征，从而克服了传统技术在相位估计错误的情况下无法提取周期性故障特征的局限性。通过使用首尔国立大学（SNU）和韩国标准与科学研究院（KRISS）的 2 千瓦行星齿轮箱试验台的数据进行分析模拟和实验验证，验证了所提方法的有效性。结果表明，在相位估计误差较大的情况下，与传统方法相比，拟议方法在识别故障条件方面更具优势。

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引用次数: 0

Theoretical and numerical study of the thermo-mechanical coupling effect on the fluid viscous damper 流体粘性阻尼器的热机械耦合效应的理论和数值研究

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-16 DOI: 10.1016/j.jsv.2024.118846

Shangtao Hu , Hong Hao , Dongliang Meng , Menggang Yang

The fluid viscous damper (FVD) is a typical passive energy dissipation device applied to civil engineering structures for vibration control. However, the heat generated during its operation will alter the properties of the fluid, thereby affecting the damping force. This study explores the thermo-mechanical coupling effect on the performance of the FVD. A theoretical model is developed based on fluid dynamics and thermodynamics to reflect the interaction between the real-time damping force and temperature of the FVD. Computational fluid dynamics (CFD) simulations are performed to investigate the impact of the thermo-mechanical coupling effect on the hysteresis performance of the damper and validate the proposed calculation method. The dynamic behavior and vibration mitigation effectiveness of the FVD considering the thermo-mechanical coupling effect are examined based on time history analysis on a single-degree-of-freedom and a multi-degree-of-freedom system. The results indicate that the increased temperature will lead to a reduction in the damping force, while the degraded force will in turn slow the temperature rise. Long-duration and high-intensity excitations can significantly amplify the impact of the thermo-mechanical coupling effect, thus it is essential to be considered in designing dampers for loads in the service stage and major earthquakes. The thermo-mechanical coupling effect on the supplemental damping ratio of the damper is greater than that on structural response control effectiveness, thereby it cannot be neglected when the damping ratio is used as the design criterion for FVDs.

流体粘性阻尼器（FVD）是一种典型的被动消能装置，用于土木工程结构的振动控制。然而，在其运行过程中产生的热量会改变流体的特性，从而影响阻尼力。本研究探讨了热机械耦合效应对 FVD 性能的影响。基于流体动力学和热力学建立了一个理论模型，以反映 FVD 的实时阻尼力和温度之间的相互作用。通过计算流体动力学（CFD）模拟，研究了热机械耦合效应对阻尼器滞后性能的影响，并验证了所提出的计算方法。在对单自由度和多自由度系统进行时间历程分析的基础上，考察了考虑热机械耦合效应的 FVD 的动态行为和减振效果。结果表明，温度升高会导致阻尼力减小，而阻尼力减小反过来又会减缓温度升高。持续时间长和强度高的激励会显著放大热机械耦合效应的影响，因此在设计阻尼器以承受使用阶段的负载和大地震时必须考虑到这一点。热机械耦合效应对阻尼器补充阻尼比的影响大于对结构响应控制效果的影响，因此在使用阻尼比作为 FVD 的设计标准时，不能忽视热机械耦合效应。

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引用次数: 0

Ultra-low frequency active vibration isolation system with quasi-zero stiffness characteristic using self-tuning filter-based feedforward control 利用基于自整定滤波器的前馈控制，实现具有准零刚度特性的超低频主动隔振系统

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-16 DOI: 10.1016/j.jsv.2024.118848

Tian-Yi Li , Cheng-Long Yu , Xu-Yang Yu , Bin Li , Bo Zhao , Jiu-bin Tan

Purpose of study

This study aims to resolve the compromise between low suspension stiffness and high load-bearing capability in vibration isolation and enhance the suppression performance of ultra-low frequency vibration through advanced active feedforward control methods, featuring high-performance precision isolation for large-scale ultra-precision instruments.

Describe methods

An air-magnetic hybrid parallel configuration of positive and negative stiffness is employed to achieve adjustable stiffness, endowing the vibration isolation system with quasi-zero stiffness characteristics. A novel self-tuning feedforward control strategy is proposed through a self-tuning filter to update the controller parameters online, minimizing the loss caused by model uncertainties.

Results

The vertical and horizontal natural frequencies of the system exhibit a remarkably low resonance frequency of lower than 0.5 Hz. With the self-tuning feedforward strategy, the maximum vibration attenuation reaches 78 dB in the vertical direction and 70 dB in the horizontal direction, reducing the cumulative power at 100 Hz by 61.4 % and 47.8 %, respectively. The above results showcase the proposed approach with excellent performance in isolating low-frequency vibrations.

Conclusions/Discussion

The ultra-low frequency active vibration isolation system designed in this paper achieves exceptionally low suspension stiffness. The implemented self-tuning feedforward controller isolates large precision machinery from broadband floor vibrations and significantly enhances the vibration isolation performance of the system.

研究目的本研究旨在通过先进的主动前馈控制方法，解决隔振系统中低悬挂刚度和高承载能力之间的折衷问题，提高对超低频率振动的抑制性能，为大型超精密仪器提供高性能精密隔振。提出了一种新颖的自整定前馈控制策略，通过自整定滤波器在线更新控制器参数，最大限度地减少了模型不确定性造成的损失。采用自调整前馈策略后，垂直方向和水平方向的最大振动衰减分别达到 78 dB 和 70 dB，100 Hz 时的累积功率分别降低了 61.4% 和 47.8%。上述结果表明，所提出的方法在隔离低频振动方面具有出色的性能。结论/讨论本文所设计的超低频主动隔振系统实现了极低的悬挂刚度。所实现的自整定前馈控制器可将大型精密机械与宽带地面振动隔离开来，并显著提高了系统的隔振性能。

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引用次数: 0

Vibration analysis of a coupled propulsion shaft-shell system based on the numerical and semi-analytical methods 基于数值和半分析方法的耦合推进轴壳系统振动分析

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-11-15 DOI: 10.1016/j.jsv.2024.118845

Jianyu Liu , Xinbin Li , Jing Liu , Yajun Xu , Guang Pan

The bidirectional coupling characteristics of vibrations for the propulsion shaft and the combined shell should be produced in the ocean conditions. Many previous studies always simplified the coupling relationship between the propulsion shaft and the combined shell, which neglected the deformation of the flexible shell or the time-varying stiffness of the support bearings. In this work, a comprehensive dynamic model of the flexible propulsion shaft-combined shell system is established, which considers the time-varying stiffness and contact forces of the bearings. A solution strategy approach combining the numerical and semi-analytical methods is adopted to improve the computational efficiency and reasonable accuracy of the previous methods. The dynamic responses of the system with the time-varying and time-in various bearing stiffness are compared to show the advantages of the proposed model. Note that the time-varying stiffness of the bearings can significantly affect the vibrations of the flexible coupled system. Moreover, the influences of the flexible shell thickness, eccentricity errors of the flexible shaft, and the bearing arrangements on the coupled system's vibrations are investigated. The findings can provide some references for the optimization methods of the vibration and noise reduction in underwater vehicles.

推进轴和组合壳体振动的双向耦合特性应在海洋条件下产生。以往的许多研究都简化了推进轴与组合壳体之间的耦合关系，忽略了柔性壳体的变形或支撑轴承的时变刚度。本研究建立了柔性推进轴-组合壳体系统的综合动力学模型，考虑了轴承的时变刚度和接触力。采用数值方法和半解析方法相结合的求解策略，提高了以往方法的计算效率和合理精度。比较了不同轴承刚度的时变和时入系统的动态响应，以显示所提模型的优势。需要注意的是，轴承的时变刚度会显著影响柔性耦合系统的振动。此外，还研究了挠性壳厚度、挠性轴偏心误差和轴承布置对耦合系统振动的影响。研究结果可为水下航行器减振降噪的优化方法提供一些参考。

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引用次数: 0