Journal of Sound and Vibration最新文献_第2页

On reflection of cylindrical waves in a solid half-space due to a line P source 线P源对圆柱形波在固体半空间中的反射

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-02-04 DOI: 10.1016/j.jsv.2026.119695

Ya-Zhou Liu , Yeong-Bin Yang , Hsiao-Hui Hung , Jie Li , Ze-Yang Zhou

This paper presents an intuitive method for deriving the asymptotic solution of all detectable waves reflected at the free surface due to the incidence of a line P source, i.e., P- and S-disturbances that propagate horizontally at their respective velocities with a decrease rate of

x^{- 3 / 2}

(where

x

denotes the horizontal distance). At first, the line P source is regarded as a combination of plane-wave components incident with real angles and those incident with imaginary angles. Based on the theory of plane-wave reflection with an extension to the range of imaginary incidences, the two transmissible plane-wave incidences of small real angle and of finite imaginary angle which directly lead to the actual P- and S-disturbances at large distances, respectively, are identified. Consequently, the geometric ray representation for near-field reflection associated with the S-disturbance is clarified after a modification upon the conventional theory. In analogy with the classical plane-wave reflection theory, the reflected waves are obtained by multiplying the fully reflected waves due to the incident cylindrical wave by the corresponding reflection coefficients, which are determined by the stress-free condition at the surface. Hence, the present solution can capture all the reflected waves with a decrease rate of

x^{- 3 / 2}

, unlike the conventional asymptotic solution. This intuitive method not only simplifies the calculation of asymptotic solutions using the method of steepest descent or stationary phase, but is physically more meaningful via establishment of a direct link between the reflection of plane waves and that of cylindrical waves. Results show that the S-disturbance due to a shallow or slowly oscillating line P source becomes significant especially for the responses beneath the surface. In contrast, the S-disturbance was recognized as a minor response and ignored in many existing studies.

本文提出了一种直观的方法，用于推导所有可探测波在自由表面反射的渐近解，这是由于线P源的入射，即以各自的速度水平传播的P-和s -扰动，其衰减率为x−3/2（其中x表示水平距离）。首先将线P源看作实角入射平面波分量和虚角入射平面波分量的组合。根据扩展到虚入射范围的平面波反射理论，找出了直接导致大距离实际P-扰动和s -扰动的两种小实角和有限虚角的透射平面波入射。因此，在对传统理论进行修正后，澄清了与s扰动相关的近场反射的几何射线表示。与经典平面波反射理论类似，反射波是由入射圆柱波引起的全反射波乘以相应的反射系数得到的，反射系数由表面无应力条件决定。因此，与传统的渐近解不同，该解可以捕获所有反射波，衰减率为x−3/2。这种直观的方法不仅简化了用最陡下降法或定相法求渐近解的计算，而且在平面波反射和柱面波反射之间建立了直接联系，在物理上更有意义。结果表明，由于浅振荡或慢振荡线P源引起的s扰动对地表以下的响应尤为明显。相比之下，s干扰被认为是一种轻微的反应，在许多现有的研究中被忽略。

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引用次数: 0

Investigation of the drag coefficient of rotational fluid damper using computational fluid dynamics 基于计算流体力学的旋转流体阻尼器阻力系数研究

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-02-04 DOI: 10.1016/j.jsv.2026.119688

Ruisheng Ma , Youshen Guo , Haoran Zuo

Dampers are essential devices used to absorb or dissipate vibration energy, contributing significantly to structural vibration control. An innovative rotational fluid damper (RFD) utilizing water as can energy dissipation medium has been developed. This damper generates substantial resistance to relative motion between its terminals when submerged in water, offering a significant damping effect to effectively mitigate excessive vibrations of structures. In this study, computational fluid dynamics (CFD) simulations are employed to thoroughly investigate the mechanical behaviors of the RFD. The configuration and mechanical model of the RFD are first introduced. Subsequently, the CFD model of the RFD is developed in ANSYS/Fluent and validated through comparison with experimental test data. Based on the validated model, the influences of six critical parameters on the drag coefficient of the RFD are comprehensively analyzed, including the Keulegan-Carpenter (

K C

) number, oscillation frequency, length-to-radius ratio, thickness-to-radius ratio, number and perforation ratio of the turning plates. The results indicate that when

K C

> 0.4, the drag coefficient of the RFD is almost independent of the

K C

number, oscillation frequency, length-to-radius ratio, and thickness-to-radius ratio, while it is negatively correlated with the number and perforation ratio of the turning plates. In addition, the drag coefficient of the RFD is significantly influenced by the

K C

number when

K C

< 0.4. This study provides an in-depth understanding of the RFD and paves the way for potential engineering applications.

阻尼器是吸收或消散振动能量的重要装置，在结构振动控制中起着重要作用。研制了一种利用水作为耗能介质的新型旋转流体阻尼器（RFD）。这种阻尼器在浸入水中时对其末端之间的相对运动产生很大的阻力，提供显著的阻尼效果，有效地减轻结构的过度振动。在本研究中，采用计算流体力学（CFD）模拟来深入研究RFD的力学行为。首先介绍了RFD的结构和力学模型。随后，在ANSYS/Fluent中建立RFD的CFD模型，并与实验测试数据进行对比验证。在验证模型的基础上，综合分析了Keulegan-Carpenter （KC）数、振荡频率、车削板长径比、车削板厚径比、车削板数、车削板穿孔比等6个关键参数对RFD阻力系数的影响。结果表明：当KC >； 0.4时，RFD阻力系数与KC数、振荡频率、长径比、厚径比基本无关，而与转板数和穿孔比呈负相关；此外，当KC <； 0.4时，RFD的阻力系数受KC数影响显著。本研究提供了对RFD的深入理解，并为潜在的工程应用铺平了道路。

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引用次数: 0

Performance limitations and vibration control for isolation systems 隔离系统的性能限制和振动控制

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-02-03 DOI: 10.1016/j.jsv.2026.119677

Hongchao Li , Michael Z Q Chen , Chanying Li

Over the past few decades, various passive and active vibration isolators have been developed to enhance isolation performance for mechanical systems and equipment. However, a fundamental question remains: what is the maximum achievable performance of an isolation system using these isolators? This paper investigates the inherent performance limitations of isolation systems and proposes strategies for vibration control within these constraints. In the first part, we employ the Youla parametrization to derive analytical expressions for the performance limitations of the frequency response functions (FRFs) of the isolation system, including the maximum value and invariant points of single FRF, as well as inherent trade-offs among different FRFs. In the second part, these theoretical limitations are applied to vibration control. Based on the derived performance limitations, we propose the procedures for achieving FRF assignment in the isolation system. Additionally, a simple controller is proposed for the isolation system, enabling effective vibration attenuation over almost the entire frequency range with only three adjustable parameters. Numerical examples demonstrate that the isolation system with the proposed controllers has good time-domain and frequency-domain performance.

在过去的几十年里，各种被动和主动隔振器已经被开发出来，以提高机械系统和设备的隔振性能。然而，一个基本问题仍然存在：使用这些隔离器的隔离系统的最大可实现性能是什么？本文研究了隔振系统固有的性能限制，并提出了在这些限制条件下的振动控制策略。在第一部分中，我们利用Youla参数化推导了隔离系统频响函数（FRF）性能限制的解析表达式，包括单个频响函数的最大值和不变点，以及不同频响函数之间的固有权衡。在第二部分，这些理论限制应用于振动控制。基于导出的性能限制，我们提出了在隔离系统中实现频响分配的程序。此外，提出了一种简单的隔离系统控制器，在几乎整个频率范围内实现有效的振动衰减，只有三个可调参数。数值算例表明，采用该控制器的隔离系统具有良好的时域和频域性能。

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引用次数: 0

Thermo-mechanical vibration analysis of bi-directional functionally graded plates in bi-directional temperature fields 双向温度场下双向功能梯度板的热-机械振动分析

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-02-03 DOI: 10.1016/j.jsv.2026.119684

Chen Chen , Daokui Li , Lilin Zhou , Caizhi Fan

Characterized by continuous material gradient in two spatial directions, bi-directional functionally graded materials (2D FGMs) are born to adapt to the bi-directional temperature fields (2D TF) near the stagnation point of hypersonic vehicle wing leading edges. Their unique configuration mitigates peak thermal stresses and homogenizes stress distribution, which exhibits promising potential in hypersonic vehicles. Existing studies predominantly focused on uniform/unidirectional TFs or axisymmetric geometries, with natural frequencies derived numerically. This study investigated the dynamic characteristics of 2D FGM square plates with temperature-dependent material properties subjected to 2D TFs that approximating service conditions for the first time. First, a 2D TF model conforming to the heat conduction equation was established. Second, governing equations were derived based on the power-law function, four-variable shear deformation theory, and Hamilton’s principle. Subsequently, an analytical framework integrating the Levy method, the perturbation approach, and the state-space method was developed and validated. Finally, the compound parametric effects of TFs, power-law indexes, and material gradients were investigated. It was found that, frequencies and thermally induced forces are more sensitive to the temperature gradient along the thickness direction; The 2D material gradient coordinated with the 2D TF and effectively suppresses thermally induced forces across most regions.

为了适应高超声速飞行器机翼前缘驻点附近的双向温度场，在两个空间方向上具有连续的材料梯度特征的双向功能梯度材料（2D fgm）应运而生。其独特的结构减轻了峰值热应力和均匀应力分布，在高超声速飞行器中显示出很好的潜力。现有的研究主要集中在均匀/单向tf或轴对称几何上，其固有频率是数值推导的。本文首次研究了具有温度相关材料性能的二维FGM方形板在接近使用条件的二维tf作用下的动态特性。首先，建立符合热传导方程的二维TF模型。其次，基于幂律函数、四变量剪切变形理论和Hamilton原理推导了控制方程；随后，开发并验证了一个综合Levy方法、微扰方法和状态空间方法的分析框架。最后，研究了TFs、幂律指数和材料梯度的复合参数效应。结果表明，频率和热激力对沿厚度方向的温度梯度更为敏感；二维材料梯度与二维TF协调，有效地抑制了大部分区域的热诱导力。

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引用次数: 0

Bimodal analysis on random vibration of pipes conveying fluid 输送流体管道随机振动的双峰分析

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-29 DOI: 10.1016/j.jsv.2026.119675

Hufei Li , Yuan Liu , Sha Wei , Hu Ding , Li-Qun Chen

This study investigates bimodal analysis of random vibrations in fluid-conveying pipes by considering gyroscopic effects, contrasting with previous studies that relied on single modal analysis by first-order Galerkin truncation models. A high-dimensional coupled stochastic differential equation for the pipe system is established to capture complex modal interactions and nonlinear coupling effects. The right boundary of the Itô equation obtained from the pipe system with the gyroscopic term is proven to be the exit boundary. Through the stochastic averaging method for quasi non-integrable Hamilton systems, a time-varying Fokker-Planck-Kolmogorov (FPK) equation is derived and numerically solved to calculate the transient probability density function of the system total energy. The results accuracy is validated by comparing results with the Monte Carlo approach in two ways: the exact expression and numerical integration results of the diffusion coefficient. The variation of transient probability density functions with time is studied over a certain period, and the effects of noise intensity, fluid speed and pipe length on probability density functions of the system total energy are investigated. Numerical examples show that compared to the results of single modal analysis, this approach improves the prediction accuracy and accurately captures the random vibration characteristics of the fluid-conveying pipe.

与以往基于一阶Galerkin截断模型的单模态分析不同，本文研究了考虑陀螺效应的输油管随机振动的双峰分析。建立了管道系统的高维耦合随机微分方程，以捕捉复杂模态相互作用和非线性耦合效应。证明了带陀螺项的管道系统Itô方程的右边界为出口边界。通过准不可积Hamilton系统的随机平均方法，推导了一个时变Fokker-Planck-Kolmogorov （FPK）方程，并对其进行了数值求解，计算了系统总能量的暂态概率密度函数。从扩散系数的精确表达式和数值积分结果两方面与蒙特卡罗方法进行了比较，验证了结果的准确性。研究了瞬态概率密度函数在一定时间内随时间的变化规律，研究了噪声强度、流体速度和管道长度对系统总能量概率密度函数的影响。数值算例表明，与单模态分析结果相比，该方法提高了预测精度，准确地捕捉了输送管道的随机振动特性。

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引用次数: 0

Efficient prediction of the response of finite acoustic black hole structures under distributed loads 分布荷载作用下有限声黑洞结构响应的有效预测

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-28 DOI: 10.1016/j.jsv.2026.119674

Xingxing Lin , Vladislav Sorokin , Andrew Hall , Xueyi Zhao

This study presents an analytical approach for investigating the dynamic behaviour of finite Euler-Bernoulli beams with one or more embedded Acoustic Black Holes (ABHs) under distributed loading. The proposed approach is based on the Method of Varying Amplitudes, which enables the computation of natural frequencies and mode shapes for finite structures with thickness modulation. Notably, the approach is applicable to various structural geometries, including classical power-law profiles and harmonic profiles constituting periodic ABH-like structures. The natural frequencies and mode shapes of the beams with incorporated ABHs are used to calculate their response to external arbitrarily distributed loading. Case studies involving both concentrated and distributed loads are used to validate the accuracy and robustness of the proposed method, with results compared to numerical simulations. The approach offers valuable insights for the design and optimization of finite ABH structures for vibration suppression under arbitrarily distributed loading and applications in noise control.

本文提出了一种分析方法来研究具有一个或多个嵌入声黑洞（ABHs）的有限欧拉-伯努利梁在分布载荷下的动力行为。该方法基于变幅法，能够计算具有厚度调制的有限结构的固有频率和模态振型。值得注意的是，该方法适用于各种结构几何，包括经典幂律曲线和构成周期性abh结构的谐波曲线。结合ABHs的梁的固有频率和振型用于计算其对外部任意分布荷载的响应。通过集中荷载和分布荷载的实例研究，验证了所提方法的准确性和鲁棒性，并将结果与数值模拟结果进行了比较。该方法为有限ABH结构在任意分布载荷下的振动抑制设计和优化以及在噪声控制中的应用提供了有价值的见解。

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引用次数: 0

Multirotor noise control using synchrophasing under nonstationary conditions 非平稳条件下多转子同步噪声控制

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-23 DOI: 10.1016/j.jsv.2026.119673

Vítor T. Valente, Eric Greenwood, Eric N. Johnson

The growing presence of unmanned aerial vehicles (UAVs) in urban areas has raised increasing concern about their noise emissions. Although UAVs hold promise for improving urban mobility, the noise generated by their propellers can be disruptive and remains a significant barrier to public acceptance. Previous studies showed that radiated noise in one or more directions of these vehicles can be reduced by synchronizing the phase relationships between multiple rotors on the aircraft. This paper expands the experimental analysis of this concept by focusing on nonstationary acoustic conditions while analyzing attenuation and amplification cases. These conditions include changing the target region location, changing the angular velocity set point, changing the target region location and velocity set point at the same time, and also generating torques. A small hexacopter mounted in an anechoic chamber is used for the experimental evaluation. Results suggest a difference of 12 dB can be achieved when comparing attenuation and amplification cases for the varying target location. Predictions show larger differences when analyzing only tonal components. When generating torques, experimental measurements suggest that even in a worst-case scenario, where motors are grouped into four distinct categories based on similar angular velocity set points, a noise reduction of approximately 3 dB to 4 dB can be achieved.

越来越多的无人驾驶飞行器（uav）出现在城市地区，引起了人们对其噪音排放的越来越多的关注。尽管无人机有望改善城市交通，但其螺旋桨产生的噪音可能具有破坏性，并且仍然是公众接受的重大障碍。先前的研究表明，这些飞行器的一个或多个方向的辐射噪声可以通过同步飞机上多个旋翼之间的相位关系来降低。本文在分析衰减和放大情况的同时，重点分析了非平稳声学条件，扩展了这一概念的实验分析。这些条件包括改变目标区域位置，改变角速度设定点，同时改变目标区域位置和速度设定点，并产生转矩。在消声室中使用小型六旋翼机进行实验评估。结果表明，在不同目标位置的衰减和放大情况下，可以实现12 dB的差异。当只分析音调成分时，预测显示出更大的差异。当产生扭矩时，实验测量表明，即使在最坏的情况下，电机根据相似的角速度设定值分为四个不同的类别，也可以实现大约3 dB到4 dB的降噪。

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引用次数: 0

Corrigendum to “Nonlinear vibration analysis of compressible constrained layer damping using a frequency- and load-dependent virtual material” [J. Sound Vib. 626 (2026) 119626] “基于频率和载荷相关虚拟材料的可压缩约束层阻尼非线性振动分析”[J]。[au:][音626 (2026)]

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-22 DOI: 10.1016/j.jsv.2026.119662

Yongbu Jin, Dong Wang, Di Yuan, Yihan Du, Qiang Wan

引用次数: 0

Vibration analysis of planetary roller screw mechanism with time-varying mesh stiffness in non-circular gear engagement 非圆齿轮啮合时变啮合刚度行星滚子螺杆机构振动分析

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-16 DOI: 10.1016/j.jsv.2026.119665

Qianjin Xu , Shangjun Ma , Yao Zhang , Linping Wu , Maodong Niu , Kan Liu

The Planetary Roller Screw Mechanism (PRSM) enables high-precision power transmission via synchronized meshing of thread pairs and modified non-circular gear pairs. While the thread pairs maintain continuous contact, the non-circular gears exhibit periodic engagement-disengagement due to their helix-cut profiles. This inherent disparity in meshing mechanisms establishes the gear pair as the primary vibration excitation source. This study analytically resolves the time-varying mesh stiffness (TVMS) of non-circular gears and thread-pair contact stiffness to construct a multi-degree-of-freedom coupled dynamic model using lumped-parameter theory. The simulated vibration modes—classified as torsional, transverse, and roller modes—yield dynamic responses including displacement, velocity, and acceleration spectra for all components. Experimental validation confirms the model’s accuracy. The study found that the average TVMS of non-circular gears is 28 % lower than that of standard gears, and the internal ring gear is the vibration source of the PRSM system. The findings provide a quantifiable design basis for vibration control and condition monitoring in high-performance PRSM systems.

行星滚子螺杆机构（PRSM）通过同步啮合螺纹副和修改的非圆齿轮副实现高精度动力传输。当螺纹对保持连续接触时，非圆齿轮由于其螺旋形切削轮廓而表现出周期性的啮合-分离。啮合机构的这种固有差异使齿轮副成为主要的激振源。本文采用集总参数理论解析求解非圆齿轮时变啮合刚度和线副接触刚度，建立了多自由度耦合动力学模型。模拟的振动模式——分为扭转、横向和滚轴模式——产生了包括所有部件的位移、速度和加速度谱在内的动态响应。实验验证了模型的准确性。研究发现，非圆齿轮的平均TVMS比标准齿轮低28%，内环齿轮是PRSM系统的振动源。研究结果为高性能永磁同步电机系统的振动控制和状态监测提供了可量化的设计依据。

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引用次数: 0

Data-driven modeling of global bifurcations and chaos in a mechanical system under delayed and quantized control 时滞和量化控制下机械系统全局分岔和混沌的数据驱动建模

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2026-01-16 DOI: 10.1016/j.jsv.2026.119660

Giacomo Abbasciano , Balázs Endrész , Gábor Stépán , George Haller

We illustrate how the recent theory of Spectral Submanifolds (SSM) can capture global bifurcations and complex dynamics in mechanical systems even under delay and spatial discretization. Specifically, we build a parameter-dependent SSM-reduced model that predicts global heteroclinic and local bifurcations in a Furuta pendulum under control with delay, and verify these predictions numerically. Under additional spatial discretization of the digital controller, we also obtain an SSM-reduced model that correctly reproduces a numerically and experimentally observed microchaotic attractor in the system.

我们说明了谱子流形（SSM）的最新理论如何在延迟和空间离散下捕获机械系统中的全局分岔和复杂动力学。具体而言，我们建立了一个参数依赖的ssm简化模型，该模型预测了具有时滞控制的古立摆的全局异斜和局部分岔，并通过数值验证了这些预测。在数字控制器的额外空间离散化下，我们还获得了一个ssm简化模型，该模型正确地再现了系统中数值和实验观察到的微混沌吸引子。

引用次数: 0