Journal of Sound and Vibration最新文献_第6页

Phase-cancellation of velocity oscillations in a flow duct using a slow-sound metamaterial 利用慢声超材料消除流动管道中的相位振荡

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-24 DOI: 10.1016/j.jsv.2024.118774

Richard Martin, Khushboo Pandey, Bruno Schuermans, Nicolas Noiray

Self-sustained acoustic oscillations in industrial systems with mean flow can cause unwanted vibrations or noise pollution. Acoustic metamaterials can be engineered and integrated in such systems to prevent these limit cycles. In this study, an acoustic metamaterial is proposed for decreasing the acoustic admittance at the outlet of a contraction in a pipe. It can reduce velocity oscillations by more than 50%, without requiring an enlargement of the pipe or increasing the static resistance to the mean flow significantly. The acoustic metamaterial consists of an array of slow-sound and regular channels, which form a contraction in a pipe. The slow-sound effect shifts the resonances of the respective slow-sound channels. For the frequency of interest, the velocity oscillations of these two types of channels are out of phase, which reduces the spatially averaged velocity oscillations at the outlet of the contraction and therefore decreases its acoustic admittance. The effect is demonstrated experimentally, using impedance measurements and particle image velocimetry. A key achievement of this work is the demonstration of a device that is nearly lossless for the mean (steady) flow, i.e. having a low pressure drop, while being very stiff for the acoustic (oscillating) flow at its nominal working frequency, i.e. low admittance, which was so far a difficult challenge to address.

平均流动的工业系统中的自持声振荡会造成不必要的振动或噪声污染。可以设计声超材料并将其集成到此类系统中，以防止这些极限循环。本研究提出了一种声超材料，用于降低管道收缩出口处的声导纳。它可以将速度振荡降低 50%以上，而不需要扩大管道或显著增加平均流动的静态阻力。声超材料由慢速声道和规则声道阵列组成，在管道中形成一个收缩。慢声效应会移动各自慢声通道的共振。在相关频率下，这两类通道的速度振荡不同步，从而降低了收缩出口处的空间平均速度振荡，进而降低了其声纳导纳。通过阻抗测量和粒子图像测速仪，实验证明了这种效应。这项工作的一项重要成果是展示了一种装置，该装置在平均（稳定）流动时几乎无损耗，即具有低压降，而在额定工作频率下，在声学（振荡）流动时却非常坚硬，即具有低导纳，而这是迄今为止难以解决的难题。

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引用次数: 0

Frequency domain solution method for electromagnetic influence analysis on torsional vibrations 扭转振动电磁影响分析的频域求解方法

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-24 DOI: 10.1016/j.jsv.2024.118780

Sampo Laine , Urho Hakonen , Hannu Hartikainen , Raine Viitala

In electric motor-driven machines, mechanical torsional dynamics are nonlinearly coupled with the electrical system through the electromagnetic torque and the counter-electromotive force. In this paper, an approach based on small-signal linearization is proposed for modeling the steady-state torsional dynamics of the coupled system. Using the linearized model, resonance interference diagrams, torsional response, and stability can be evaluated rapidly across numerous operating points, while accurately accounting for the electromagnetic effects. The model is validated with conventional time-stepping simulations of two induction machines. An example analysis of a 3 MW motor-driven compressor train displays the modification of torsional properties due to the electromagnetic coupling effect and explains the mechanism of torsional destabilization. Finally, previously published measurements of a 37 kW motor test bench are considered to validate the instability of the elastic torsional mode predicted by the model.

在电机驱动的机器中，机械扭转动力学通过电磁转矩和反电动势与电气系统非线性耦合。本文提出了一种基于小信号线性化的耦合系统稳态扭转动力学建模方法。利用线性化模型，可以快速评估多个工作点的共振干扰图、扭转响应和稳定性，同时准确地考虑电磁效应。该模型通过对两台感应电机进行传统的时间步进仿真进行了验证。对 3 兆瓦电机驱动压缩机组的实例分析显示了电磁耦合效应对扭转特性的影响，并解释了扭转失稳的机理。最后，考虑了之前公布的 37 千瓦电机试验台的测量结果，以验证模型预测的弹性扭转模式的不稳定性。

引用次数: 0

Strange nonchaotic attractors and bifurcation of a four-wheel-steering vehicle system with driver steering control 具有驾驶员转向控制功能的四轮转向汽车系统的奇异非混沌吸引子和分岔

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-24 DOI: 10.1016/j.jsv.2024.118781

Pengcheng Miao , Jicheng Duan , Denghui Li , Celso Grebogi

In this paper, a dynamical model is developed for the four-wheel-steering(4WS)vehicles, with nonlinear lateral tyre forces and quasi-periodic disturbances from the steering mechanism and quasi-periodic pavement external deformation. Initially, the stability and Hopf bifurcation of the 4WS vehicle system without disturbance are analyzed employing the central manifold theory and projection method. The effects of parameters on the stability and the types of Hopf bifurcation for the vehicle system are also discussed. It is shown that both Hopf bifurcation and degenerate Hopf bifurcation occur in the vehicle system. The critical speed decreases with increased driver’s perceptual time delay and distance from the vehicle’s center of gravity to the front axles, while it increases with the control strategy coefficient. However, the increase of the frontal visibility distance of the driver leads to an initial increase of the critical speed, decreasing afterwards. Subsequently, the strange nonchaotic dynamical behavior of the disturbed 4WS system is investigated. Several routes and mechanisms for the birth of strange nonchaotic attractors (SNAs) are identified, including the torus doubling bifurcation, the torus fractalization, and the loss of transverse stability of a torus. Finally, the nonchaotic property is verified through the calculation of the maximum Lyapunov exponent, and the strange property is characterized using power spectra and rational approximation.

本文建立了四轮转向（4WS）车辆的动力学模型，该模型具有非线性轮胎侧向力和来自转向机构的准周期扰动以及准周期路面外部变形。首先，利用中心流形理论和投影法分析了无扰动 4WS 车辆系统的稳定性和霍普夫分岔。此外，还讨论了参数对稳定性的影响以及车辆系统的霍普夫分岔类型。结果表明，车辆系统中出现了霍普夫分岔和退化霍普夫分岔。临界速度随着驾驶员感知时间延迟和车辆重心到前轴距离的增加而减小，同时随着控制策略系数的增加而增大。然而，驾驶员前方可视距离的增加会导致临界速度的初始增加，之后又会降低。随后，研究了受干扰的 4WS 系统的奇异非混乱动力学行为。研究发现了奇异非混沌吸引子（SNAs）产生的几种途径和机制，包括环倍增分岔、环分形化以及环的横向稳定性丧失。最后，通过计算最大 Lyapunov 指数验证了非混沌特性，并利用功率谱和有理近似描述了奇异特性。

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引用次数: 0

Exploiting reprogrammable nonlinear structural springs for enhancing the manoeuvrability of a vibro-impact capsule robot 利用可重新编程的非线性结构弹簧增强振动冲击胶囊机器人的操纵性

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-24 DOI: 10.1016/j.jsv.2024.118775

Yujia Zhang , Jiajia Shen , Yao Yan , Jingzhong Tong , Reece Lincoln , Lei Zhang , Yang Liu

Vibro-impact capsule robots, propelled by rhythmic collisions of an internal mass triggered by an external magnetic field, are emerging as promising tools for minimally invasive surgery. This innovative actuation mechanism allows for delicate interaction with tissues, making them ideal candidates for navigating confined surgical spaces. However, their limited manoeuvrability and controllability remain significant hurdles, restricting their ability to navigate complex anatomies and perform precise interventions, ultimately hindering their broader clinical applications. This paper investigates the integration of reprogrammable structural springs in capsule robots, demonstrating how dynamic tuning can tailor the interaction between the inner mass and the capsule, thereby unlocking enhanced manoeuvrability and precise control of the capsule robot. A mathematical model describing the dynamic response of a vibro-impact capsule robot integrated with von Mises trusses (VMT), which are used to tailor the interaction between the inner mass and the capsule, is developed and verified using finite element modelling. Using the verified mathematical model, we explore how the transition between mono-stability and bi-stability of VMTs affects the capsule robot’s propelling performance. Our findings demonstrate that this state switch enables four distinct propulsion modes of the capsule robot. This work paves the way for a new paradigm in small-scale robot design by incorporating reprogrammable nonlinear structures. These structures empower the robots with unprecedented manoeuvrability and controllability within a compact, deployable form factor.

振动撞击胶囊机器人是由外部磁场触发内部质量发生有节奏的碰撞而推动的，正在成为微创手术的理想工具。这种创新的驱动机制允许与组织进行微妙的互动，使它们成为在狭窄手术空间内导航的理想选择。然而，它们有限的可操作性和可控性仍然是重大障碍，限制了它们导航复杂解剖结构和执行精确干预的能力，最终阻碍了它们更广泛的临床应用。本文研究了在胶囊机器人中集成可重新编程的结构弹簧的问题，展示了如何通过动态调节来调整内部质量和胶囊之间的相互作用，从而增强胶囊机器人的机动性和精确控制。我们建立了一个数学模型，描述了一个集成了冯-米塞斯桁架（VMT）的振动冲击胶囊机器人的动态响应，并使用有限元建模进行了验证。利用经过验证的数学模型，我们探讨了 VMT 单稳态和双稳态之间的转换如何影响胶囊机器人的推进性能。我们的研究结果表明，这种状态转换可使胶囊机器人实现四种不同的推进模式。这项研究通过采用可重新编程的非线性结构，为小型机器人设计的新范例铺平了道路。这些结构使机器人在紧凑、可部署的外形尺寸内具有前所未有的机动性和可控性。

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引用次数: 0

Integrated analysis strategy for detecting gear contact fatigue before reaching failure interruption criterion 在达到失效中断标准之前检测齿轮接触疲劳的综合分析策略

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-23 DOI: 10.1016/j.jsv.2024.118792

Rodrigo Metzger da Silva, Ronnie Rodrigo Rego, Alfredo Rocha de Faria

Identifying the occurrence of gear contact fatigue failure as early as possible is essential for condition-based maintenance (CBM). Vibration signals can be used to identify gear contact fatigue. However, the use of vibration signals can be challenging due to its complexity, compounded by lower levels of vibration during the initial stages of contact fatigue. The present study details a new algorithm that integrates stand-alone features to correlate the vibrational signal with early failure occurrence. The study aim is to identify the failure in the early stages, before reaching the ISO 6336–5 stopping criterion of 4 % damaged area. A damage induction on the flank of helical gears is applied to simulate and characterize the failure occurrence. Damping characteristics with impact evaluation, Kurtosis analysis and the monitoring of the Gear Meshing Frequency are applied to characterize the failure signature. This strategy stands out by the integration of these stand-alone features and their behavior. The algorithm's capacity is verified through durability tests, promoting the natural evolution of this failure mode. Results show a success rate of above 80 % at identifying the failure presence before the stopping criterion limit.

尽早识别齿轮接触疲劳故障的发生对于基于状态的维护（CBM）至关重要。振动信号可用于识别齿轮接触疲劳。然而，由于振动信号的复杂性，再加上接触疲劳初期的振动水平较低，使用振动信号可能具有挑战性。本研究详细介绍了一种新算法，该算法整合了独立特征，可将振动信号与早期故障发生相关联。研究的目的是在达到 ISO 6336-5 停止标准（4% 的损坏面积）之前的早期阶段识别故障。斜齿轮侧面的损伤感应用于模拟和描述故障的发生。阻尼特性、冲击评估、峰度分析和齿轮啮合频率监测被用于描述故障特征。该策略通过整合这些独立特征及其行为而脱颖而出。通过耐久性测试验证了算法的能力，促进了这种故障模式的自然演化。结果表明，在停止标准限制之前识别故障存在的成功率超过 80%。

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引用次数: 0

Investigation on dynamic rubbing characteristics of a bladed rotor system with multi-mode rubbing fault 具有多模式摩擦故障的叶片转子系统动态摩擦特性研究

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-23 DOI: 10.1016/j.jsv.2024.118790

Tao Tang , Yu Wang , Shuai Wang , Mingquan Zhang , Zhenyi Chen , Yuhao Zhao

Dynamic behavior analysis of blades under high cycle fatigue with rubbing fault is vital for estimating the reliability of rotating machinery. This paper focuses on a novel rubbing model and the flexible dynamic characteristics of a shaft-blade-disk system (SBDS) model with considerations of various forms of rub-impacts. Firstly, the deformation relations and the motion equations of the SBDS model in steady state are derived using Lagrange's principle. Secondly, a new quasi-static blade rubbing model involving shaft deformation and blade coupling effect is established, and the influence of rub-impact correlation parameters on rubbing force is further explored. Then, both the effect of shaft-disk coupling on the blades at various states and the dynamic characteristics of numerous rubbing modes are also investigated. The results revealed that the asymmetric form of rub-impact will induce more complex vibrational behavior (such as frequency components and trajectory differences), while the symmetrical rubbing modes can keep the system relatively stable.

叶片在摩擦故障的高循环疲劳下的动态行为分析对于评估旋转机械的可靠性至关重要。本文重点研究了一种新型摩擦模型和轴-叶片-盘系统（SBDS）模型的柔性动态特性，并考虑了各种形式的摩擦冲击。首先，利用拉格朗日原理推导出 SBDS 模型在稳态下的变形关系和运动方程。其次，建立了涉及轴变形和叶片耦合效应的新型准静态叶片摩擦模型，并进一步探讨了摩擦撞击相关参数对摩擦力的影响。然后，还研究了不同状态下轴-盘耦合对叶片的影响以及多种摩擦模式的动态特性。结果表明，非对称形式的摩擦撞击会引起更复杂的振动行为（如频率成分和轨迹差异），而对称的摩擦模式则能使系统保持相对稳定。

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引用次数: 0

Acoustic structure inverse design and optimization using deep learning 利用深度学习进行声学结构逆向设计和优化

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-22 DOI: 10.1016/j.jsv.2024.118789

Xuecong Sun , Yuzhen Yang , Han Jia , Han Zhao , Yafeng Bi , Zhaoyong Sun , Jun Yang

From ancient to modern times, acoustic structures have been employed to manage the spread of acoustic waves. Nevertheless, designing these structures traditionally remains a laborious and computationally intensive iterative process. Recognizing that complex acoustic systems can be effectively analyzed using the lumped-parameter method, we introduce a deep learning model that learns the correlation between the equivalent electrical parameters and the acoustic properties of these structures. As an illustration, we consider the design of multi-order Helmholtz resonators, showing experimentally that our model can predict structures with high precision that closely align with the specified design criteria. Furthermore, our model can seek multiple solutions in conjunction with dimensionality reduction algorithms and support evolutionary algorithms in optimization tasks. Compared to traditional numerical methods, our approach offers greater efficiency, flexibility, and universality. The designed acoustic structures hold broad potential for applications including speech enhancement, sound absorption, and insulation.

从古到今，声学结构一直被用来管理声波的传播。然而，设计这些结构传统上仍是一个费力且计算密集的迭代过程。我们认识到，复杂的声学系统可以使用整块参数法进行有效分析，因此我们引入了一种深度学习模型，该模型可以学习这些结构的等效电气参数和声学特性之间的相关性。例如，我们考虑了多阶亥姆霍兹谐振器的设计，实验表明我们的模型可以高精度地预测与指定设计标准密切相关的结构。此外，我们的模型还能结合降维算法寻求多个解决方案，并在优化任务中支持进化算法。与传统的数值方法相比，我们的方法具有更高的效率、灵活性和通用性。所设计的声学结构在语音增强、吸音和隔音等方面具有广泛的应用潜力。

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引用次数: 0

A lever-enhanced tuned inerter damper for controlling vibrations due to rotary unbalance and bounded parametric uncertainty: Classic and robust equal-peak optimization 用于控制旋转不平衡和有界参数不确定性引起的振动的杠杆增强型调谐插入式阻尼器：经典和稳健的等峰值优化

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-22 DOI: 10.1016/j.jsv.2024.118777

Shaoyi Zhou , Bin Bao

This study proposes a lever-enhanced tuned inerter damper (LTID) for controlling the excessive vibrations induced by rotary unbalance within the primary system, whose stiffness is further considered a bounded uncertain parameter. Classic and robust equal-peak optimal design of the proposed LTID are carried out according to the methodologies stemming from the fixed-points phenomenon. Closed-form solutions to the

H_{\infty}

optimization problem are analytically derived, whose accuracy is validated by comparing with either the long-established results in the literature or exact solutions numerically obtained in this study. Numerical results clearly suggest that in contrast to the classic one, robust equal-peak optimization can always produce the same and minimized vibration amplitude at the leftmost and rightmost peaks, regardless of the stiffness uncertainty magnitude. Compared to the classic LTID, the improvement made by the robust LTID in terms of minimizing and equalizing worst-case vibration amplitudes becomes more evident as the stiffness uncertainty magnitude increases. Meanwhile, the effectiveness of LTID is controlled by the amount of inertance and the lever amplification ratio simultaneously. Finally, the proposed LTID is exempt from the need for a large oscillating mass and is appropriate for lightweight applications of vibration control, as also inferred from the fact that the inerter device could generate an inertance far greater than its physical mass and the amplification ratio of a lever could be easily adjusted by changing the location of its fulcrum.

本研究提出了一种杠杆增强调谐式阻尼器（LTID），用于控制主系统内旋转不平衡引起的过度振动，其刚度被进一步视为有界的不确定参数。根据定点现象产生的方法，对所提出的 LTID 进行了经典和稳健的等峰值优化设计。通过分析得出了 H∞ 优化问题的闭式解，并通过与文献中长期积累的结果或本研究中通过数值获得的精确解进行比较，验证了其准确性。数值结果清楚地表明，与经典的等峰优化相比，无论刚度不确定性大小如何，稳健的等峰优化总能在最左侧和最右侧峰值处产生相同且最小的振动振幅。与传统的 LTID 相比，随着刚度不确定性大小的增加，鲁棒 LTID 在最小化和均衡最坏情况振动振幅方面的改进更加明显。同时，LTID 的有效性由惰性量和杠杆放大比同时控制。最后，由于惰性装置可产生远大于其物理质量的惰性，且杠杆的放大率可通过改变其支点位置轻松调整，因此，所提出的 LTID 不需要较大的摆动质量，适用于轻量级振动控制应用。

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引用次数: 0

Chatter stability analysis for non-circular high-speed grinding process with dynamic force modelling 利用动态力建模对非圆高速磨削过程进行颤振稳定性分析

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-22 DOI: 10.1016/j.jsv.2024.118782

Tao Liu , Wenyao Li , Zhaohui Deng , Qishui Yao , Jiachang Tang , Jiaying Yan , Hongjun Kang

To avoid instability and resulting chatter during the non-circular grinding process, it is necessary to elucidate the potential occurrence of periodic chatter behavior when high-speed grinding loses stability and to define the stability boundary of the grinding system. Building upon an analysis of the geometric kinematic characteristics of non-circular profiled components, a dynamic grinding force model for non-circular high-speed grinding was derived by considering both the delay effect and the elastic yielding mechanism between the grinding wheel and workpiece. Then, A multi-factor coupled dynamic model of non-circular grinding was established. By employing a multi-scale approach, bifurcation analysis and classification of the instability process in the grinding system were conducted, using a typical non-circular profiled shaft component, such as a camshaft, for theoretical analysis and experimental validation. The research determined the stability boundary of the high-speed grinding process for non-circular profile components, validated the possibility of the existence of a conditionally stable chatter region in the non-circular high-speed grinding process, and identified differences in grinding chatter characteristics among different segments of the cam profile, with a greater propensity for chatter at the juncture of the cam fall and base circle.

为了避免在非圆形磨削过程中出现不稳定并导致颤振，有必要阐明高速磨削失去稳定性时可能出现的周期性颤振行为，并确定磨削系统的稳定性边界。在分析非圆形仿形零件几何运动特性的基础上，通过考虑延迟效应和砂轮与工件之间的弹性屈服机制，得出了非圆形高速磨削的动态磨削力模型。然后，建立了非圆形磨削的多因素耦合动态模型。通过采用多尺度方法，对磨削系统的不稳定过程进行了分岔分析和分类，并利用典型的非圆形异形轴部件（如凸轮轴）进行了理论分析和实验验证。研究确定了非圆形轮廓零件高速磨削过程的稳定边界，验证了非圆形高速磨削过程中存在条件稳定颤振区的可能性，并确定了凸轮轮廓不同区段磨削颤振特性的差异，其中凸轮落点和基圆交界处的颤振倾向更大。

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引用次数: 0

A stable decoupled perfectly matched layer for the 3D wave equation using the nodal discontinuous Galerkin method 使用节点非连续伽勒金方法的三维波方程稳定解耦完全匹配层

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2024-10-22 DOI: 10.1016/j.jsv.2024.118779

Sophia Julia Feriani , Matthias Cosnefroy , Allan Peter Engsig-Karup , Tim Warburton , Finnur Pind , Cheol-Ho Jeong

In outdoor acoustics, the calculations of sound propagating in air can be computationally heavy if the domain is chosen large enough for the sound waves to decay. The computational cost is lowered by strategically truncating the computational domain with an efficient boundary treatment. One commonly used boundary treatment is the perfectly matched layer (PML), which dampens outgoing waves without polluting the computed solution in the inner domain. The purpose of this study is to propose and assess a new perfectly matched layer formulation for the 3D acoustic wave equation, using the nodal discontinuous Galerkin finite element method. The formulation is based on an efficient PML formulation that can be decoupled to further increase the computational efficiency and guarantee stability without sacrificing accuracy. This decoupled PML formulation is demonstrated to be long-time stable, and an optimization procedure for the damping functions is proposed to enhance the performance of the formulation.

在室外声学中，如果选择的计算域足够大，声波会衰减，那么计算在空气中传播的声音就会非常繁重。通过有效的边界处理，战略性地截断计算域，可以降低计算成本。一种常用的边界处理方法是完全匹配层（PML），它可以在不污染内域计算解的情况下阻尼出射声波。本研究的目的是利用节点非连续 Galerkin 有限元方法，为三维声波方程提出并评估一种新的完全匹配层公式。该公式基于高效的 PML 公式，可以解耦以进一步提高计算效率，并在不牺牲精度的情况下保证稳定性。这种解耦 PML 公式被证明是长期稳定的，并提出了一种阻尼函数优化程序，以提高该公式的性能。

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引用次数: 0