Ultrasonics最新文献_第3页

Dirac cones and topological torsional modes in phononic nanowires using Su–Schrieffer–Heeger Model 利用Su-Schrieffer-Heeger模型研究声子纳米线中的狄拉克锥和拓扑扭转模

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-24 DOI: 10.1016/j.ultras.2026.107975

Mohammed Elaouni , Noura Ezzahni , Soufyane Khattou , Madiha Amrani , Afaf Bouzidi , Abdellatif Gueddida , El Houssaine El Boudouti , Bahram Djafari-Rouhani

Topological materials have attracted significant attention due to their distinct edge states, known for their robustness to local perturbations. In the field of phononic crystals, these states manifest as topological surface or interface modes, offering promising applications in waveguiding and energy harvesting. This study explores the emergence and control of azimuthal symmetric torsional interface states in phononic nanowires (PNWs) composed of alternating cylindrical layers. In the framework of the Su–Schrieffer–Heeger (SSH) model, we use the Green’s function approach to derive analytical expressions of the dispersion relations to predict all Dirac-point positions and interface modes. The analytical results are confirmed by finite element method simulations performed using COMSOL Multiphysics. In PNWs with symmetric unit cells, band-structures and scattering calculations reveal tunable interface modes whose frequencies and propagation characteristics can be adjusted via geometrical parameters. We also demonstrate through Zak-phase, local density of states (LDOS), and transmission-spectrum analyses that these interface states remain fixed and topologically protected under variations of the dimerization parameter. These findings pave the way for exploiting topological interface states in PNWs, thus opening to innovative phononic devices and contributing to the advancement of the field of topological physics.

拓扑材料由于其独特的边缘状态和对局部扰动的鲁棒性而引起了人们的极大关注。在声子晶体领域，这些状态表现为拓扑表面或界面模式，在波导和能量收集方面提供了有前途的应用。本研究探讨了由交替圆柱层组成的声子纳米线（PNWs）中方位对称扭转界面态的产生和控制。在Su-Schrieffer-Heeger （SSH）模型的框架中，我们使用Green函数方法推导色散关系的解析表达式，以预测所有的dirac点位置和界面模式。利用COMSOL Multiphysics进行的有限元模拟验证了分析结果。在具有对称晶胞的PNWs中，波段结构和散射计算揭示了可调谐的界面模式，其频率和传播特性可以通过几何参数来调节。我们还通过zak相位，局域态密度（LDOS）和透射谱分析证明，在二聚化参数的变化下，这些界面状态保持固定和拓扑保护。这些发现为开发PNWs中的拓扑界面态铺平了道路，从而为创新声子器件打开了大门，并为拓扑物理领域的发展做出了贡献。

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引用次数: 0

Ultrasonic pulse transmission through an acoustic barrier using a metamaterial with input impedance matching 使用输入阻抗匹配的超材料通过声障的超声脉冲传输。

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2025-12-14 DOI: 10.1016/j.ultras.2025.107927

Junyong An , Chankyu Kim , Wonju Jeon

This study proposes an input impedance-matching metamaterial to enable the transmission of ultrasonic pulses by attaching to only one side of a barrier. The metamaterial facilitates ultrasonic pulse transmission through the barrier by mitigating the mismatch between the characteristic impedance of the incident medium and the input impedance at the incident boundary of the barrier. The problem of designing the metamaterial is divided into two sub-problems by introducing a virtual intermediate layer with artificial material properties. In these sub-problems, two meta-layers constituting the metamaterial are designed through topology optimization and simplified to ensure fabrication feasibility. Numerical simulations demonstrate that the simplified metamaterial exhibits high transmittance exceeding 0.5 within 21.2% bandwidth relative to the center frequency, whereas it remains below 0.06 without the metamaterial. In water tank experiments, the transmitted pulse energy is enhanced by 6.83-fold by attaching the metamaterial to the barrier.

本研究提出了一种输入阻抗匹配的超材料，通过仅附着在屏障的一侧来实现超声波脉冲的传输。该超材料通过减轻入射介质的特性阻抗与入射边界处输入阻抗之间的不匹配，促进了超声波脉冲通过障壁的传输。通过引入具有人工材料特性的虚拟中间层，将超材料的设计问题分为两个子问题。在这些子问题中，通过拓扑优化设计了构成超材料的两个元层，并对其进行了简化以保证制造的可行性。数值模拟结果表明，在21.2%的带宽范围内，简化后的超材料相对于中心频率的透射率超过0.5，而未加入超材料的超材料相对于中心频率的透射率低于0.06。在水箱实验中，通过将超材料附着在屏障上，传输的脉冲能量提高了6.83倍。

引用次数: 0

Particle levitation in tone-burst-excited half-wavelength ultrasonic standing waves in cylindrical microresonator 半波长超声驻波在圆柱形微谐振器中的粒子悬浮

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-20 DOI: 10.1016/j.ultras.2026.107968

Nahae Kim, In-Hwan Yang

Electrical signals driving piezoelectric transducers in acoustofluidic applications are crucial for acoustic manipulation efficiency, as sinusoidal wave excitation at the resonance frequency determines the acoustic radiation force in application systems. In this study, particle levitation in half-wavelength ultrasonic standing wave fields generated by both continuous-wave and tone-burst excitations of a cylindrical microresonator was investigated by measuring the average velocity of levitating particles and their equilibrium positions. The dependence of these parameters on the characteristics of the sinusoidal voltage amplitude applied to the resonator was examined by evaluating the net force exerting on spherical fluorescent microparticles, including the time-averaged effect of tone-burst excitation. A semi-empirical correlation was proposed to predict the average energy density of the established standing wave field in the resonator. By incorporating a correction factor that quantitatively accounts for the time-averaged effect over the tone-burst repetition period, the model allows one to evaluate the average energy density of half-wavelength ultrasonic standing wave fields generated by continuous-wave and tone-burst voltage amplitudes. The predicted values in good agreement, within less than 18 % of the experimental measurements.

在声流体应用中，驱动压电换能器的电信号对声操纵效率至关重要，因为谐振频率上的正弦波激励决定了应用系统中的声辐射力。本文通过测量悬浮粒子的平均速度和平衡位置，研究了圆柱微谐振器连续波和猝发声激发下半波长超声驻波场中粒子的悬浮现象。通过评估施加在球形荧光微粒上的净力，包括音调突发激励的时间平均效应，研究了这些参数与施加在谐振器上的正弦电压幅值特性的依赖关系。提出了半经验相关法来预测谐振腔内已建立的驻波场的平均能量密度。通过纳入校正因子，定量地说明了在频响重复周期内的时间平均效应，该模型允许人们评估由连续波和频响电压幅值产生的半波长超声驻波场的平均能量密度。预测值与实验测量值的一致性较好，误差小于18%。

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引用次数: 0

Experimental and numerical simulations of ultrasonic wave- multi-phase matter interactions in cement-based composites 水泥基复合材料中超声波-多相物质相互作用的实验与数值模拟

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-20 DOI: 10.1016/j.ultras.2026.107971

Sukanya Basu , Saptarshi Sasmal

In the case of concrete, the predominant damages develop at the microscale level, mostly at a length lesser than the size of inclusions. Again, if the vibrational energy induced by the dynamic loading does not get effectively dissipated by cement-based materials, it may prolong the original micro-defects that strike down the structural durability and safety. Such nontrivial and sensitive investigations require detailed inspection. The incoherent diffuse ultrasonic wave energy carries essential information about the material microstructure. Analysis based on statistical diffusion theory derives two parameters- diffusivity (D) and dissipation (σ), where, D reflects the material microstructure and σ indicates the material’s viscoelastic property and damping effect. Initially, a numerical study is performed for understanding on wave-matter interaction in two scales of heterogeneity (concrete, cement paste) using diffusion-based analysis, so that role of inclusion (in cementitious matrix) on diffusion can be brought out in an uncoupled manner. The diffusivity parameters depend on tortuosity of wave path, transmission modes and the corresponding excitation frequencies. For experimental purpose, prismatic specimens are cast in two scales; ultrasonic measurements are taken with two excitation frequencies (200 and 300 kHz) under three transmission modes (direct, semi-direct, indirect). Signal processing in the Time-Frequency domain is performed to find the characteristic differences in the material microstructures at the same age of hydration (28 days) for both samples. The Spectral Energy Density of the signals provides information on spectral energy over the time window for a particular wave field. In this study, the influence of microstructure in wave propagation is explicitly demonstrated, and theoretical explanations are quantitatively validated with the actual experimental measurements.

就混凝土而言，主要的损伤发生在微观尺度上，大部分在小于夹杂物尺寸的长度上。同样，如果动荷载引起的振动能不能被水泥基材料有效耗散，可能会延长原有的微缺陷，从而影响结构的耐久性和安全性。这种重要而敏感的调查需要详细的检查。非相干漫射超声能量携带着材料微观结构的重要信息。基于统计扩散理论的分析导出了两个参数——扩散率(D)和耗散率（σ），其中D反映材料的微观结构，σ表示材料的粘弹性和阻尼效应。首先，采用基于扩散的分析方法对两种非均质尺度（混凝土、水泥浆）中的波物相互作用进行了数值研究，从而以非耦合的方式揭示了包体（在胶凝基质中）对扩散的作用。扩散系数参数取决于波路的弯曲度、传输模式和相应的激励频率。出于实验目的，棱柱形试样按两种比例浇铸；超声波测量采用两种激励频率（200和300千赫），三种传输模式（直接，半直接，间接）。对信号进行时频域处理，找出两种试样在水化龄期相同（28天）时材料微观结构的特征差异。信号的频谱能量密度提供了特定波场在时间窗口内的频谱能量信息。本研究明确论证了微观结构对波传播的影响，并通过实际实验测量定量验证了理论解释。

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引用次数: 0

Evaluation of early-stage corrosion damage using quasi-static component pulse generated by longitudinal critically refracted (LCR) wave 利用纵向临界折射波产生的准静态分量脉冲评价早期腐蚀损伤

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-06 DOI: 10.1016/j.ultras.2026.107953

Meng Qinghang , Gu Bin , Yuan Weifeng , Deng Mingxi , Ding Xiangyan , Hu Ning , Wang Jishuo

The nonlinear ultrasonic technique is an effective method for characterizing early-stage damage, such as initial corrosion, plastic deformation, and creep. However, the nonlinear response signal induced by micro-damage is typically one or two orders of magnitude weaker than the fundamental wave. This low signal-to-noise ratio is one of the main factors limiting the broader application of nonlinear ultrasonic technology. To address this issue, this study systematically investigates the quasi-static component pulse (QSCP) generated during the propagation of the longitudinal critically refracted (LCR) wave. The feasibility of assessing early corrosion damage in 7075 aluminum alloy was evaluated using the QSCP, a signal feature resulting from the interaction between corrosion-induced microcrack and LCR wave. Both numerical simulation and experimental results demonstrate a positive correlation between the QSCP-based acoustic nonlinearity parameter (ANP) and the extent of corrosion-induced microcrack, which is attributed to the increase in microcrack. Simulation results show that the ANP increases monotonically with the number of microcrack. This trend is experimentally validated, with the ANP showing a significant increase of approximately 54.8% by the fourth stage of corrosion compared to the baseline. These findings confirm the effectiveness and feasibility of the QSCP-based ANP method for detecting early-stage corrosion damage, offering a promising nondestructive approach with high sensitivity for assessing incipient corrosion in critical metallic structures.

非线性超声技术是表征材料初期腐蚀、塑性变形和蠕变等早期损伤的有效方法。然而，微损伤引起的非线性响应信号通常比基波弱一到两个数量级。这种低信噪比是限制非线性超声技术广泛应用的主要因素之一。为了解决这一问题，本研究系统地研究了纵向临界折射（LCR）波传播过程中产生的准静态分量脉冲（QSCP）。利用腐蚀诱发微裂纹与LCR波相互作用产生的信号特征QSCP，对7075铝合金早期腐蚀损伤评估的可行性进行了评价。数值模拟和实验结果均表明，基于qscp的声学非线性参数（ANP）与腐蚀诱发微裂纹的程度呈正相关，这归因于微裂纹的增加。仿真结果表明，ANP随微裂纹数量的增加而单调增加。这一趋势得到了实验验证，与基线相比，在腐蚀的第四阶段，ANP显着增加了约54.8%。这些发现证实了基于qscp的ANP方法检测早期腐蚀损伤的有效性和可行性，为评估关键金属结构的早期腐蚀提供了一种有前途的高灵敏度无损方法。

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引用次数: 0

Directional beam multiplexing using cylindrical holographic acoustic metasurfaces integrated with surface wave reflectors 结合面波反射器的圆柱全息声学超表面定向波束复用

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-25 DOI: 10.1016/j.ultras.2026.107974

Md Tausif Akram , Pinaki Mazumder , Kyungjun Song

Recent advancements in acoustic metasurfaces have significantly improved beamforming and steering capabilities, with beam multiplexing emerging as a key enabler of multidirectional sound projection. This paper proposes a cylindrical holographic acoustic metasurface integrated with surface wave reflectors (SWRs) to realize efficient acoustic beam multiplexing. By transitioning from conventional planar designs to a cylindrical geometry, the proposed metasurface supports the simultaneous generation of multiple highly directional beams at distinct combinations of elevation and azimuthal angles. The integration with SWRs enhances beam collimation and suppresses side lobes, thereby ensuring high directivity and acoustic field confinement. Both simulations and experimental validations confirmed that the metasurface could steer multiple beams generated by a single monopole source in specific directions in 3D space; this capability can help ensure reliable performance across various applications such as sonar, medical imaging, and acoustic communication. The proposed approach represents a versatile and scalable conformal platform for spatially multiplexed acoustic beam steering, marking a significant advancement in the development of multifunctional acoustic metasurfaces.

声学超表面的最新进展显著改善了波束形成和转向能力，波束多路复用成为多向声音投射的关键因素。提出了一种结合表面波反射器的圆柱全息声学超表面，以实现声波束的高效复用。通过从传统的平面设计过渡到圆柱形几何结构，提议的超表面支持同时产生多个高度定向的光束，以不同的仰角和方位角组合。与swr的集成增强了光束准直，抑制了侧瓣，从而确保了高指向性和声场约束。仿真和实验验证均证实，该超表面可以将单个单极子源产生的多束光束引导到三维空间的特定方向；这种能力有助于确保在声纳、医学成像和声学通信等各种应用中具有可靠的性能。所提出的方法代表了一个通用的、可扩展的保形平台，用于空间复用声波束转向，标志着多功能声学元表面发展的重大进步。

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引用次数: 0

Adaptive sampling for efficient Lamb wavefield reconstruction in composite laminates with Spatial-Temporal Masked AutoEncoder 基于时空掩膜自编码器的复合材料层合板Lamb波场自适应重构。

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-21 DOI: 10.1016/j.ultras.2026.107972

Dingcheng Ji , Wenhao Li , Fei Gao , Jiadong Hua , Jing Lin

The increasing demand for high-accuracy damage quantification in carbon fiber reinforced plastics (CFRP) has led to the widespread adoption of ultrasonic Lamb wave testing (ULWT) for non-destructive testing (NDT) in various engineering applications. The non-contact Scanning Laser Doppler Vibrometer (SLDV) has emerged as a valuable tool for damage evaluation. However, despite significant research on Lamb wavefield analysis methods, the rapid and reliable acquisition of full wavefield data remains a substantial challenge, limiting SLDV’s applicability in real-world engineering scenarios. This study presents a novel deep learning-based approach to reconstructing full wavefield data from highly under-sampled wavefield data using the Spatial-Temporal Masked AutoEncoder (STMAE). By leveraging time-series high-sparsity Lamb wavefield data, our method achieves remarkable reconstruction performance with a sampling ratio as low as 5%. Furthermore, we propose a novel scanning path optimization method based on Bayesian Optimization, which generates adaptive sparse spatial sampling patterns for wavefield reconstruction. The integration of this adaptive sampling pattern with the STMAE, termed as AdaSTMAE, yields lower precision wavefield prediction error around the damage areas. A comprehensive parametric study on the sampling ratio was conducted and validated through comparative experiments in both single-damage, multi-damage scenarios. The implementation of the adaptive sampling strategy resulted in a 2–16% reduction in reconstruction error for single-damage scenarios and a 0.7–5% reduction for multi-damage scenarios around damage areas, compared to scenarios without the adaptive strategy. Our experimental results demonstrate the outstanding performance of the proposed technique in wavefield reconstruction, achieving an 87–88% reduction in reconstruction error relative to the original masked autoencoder (MAE) across different sampling ratios (5%-25%). Additionally, cross-structural validation using composite blades with variable thickness confirmed the model’s strong generalization capability, effectively reconstructing wavefront distortion and velocity variation without fine-tuning.

碳纤维增强塑料（CFRP）对高精度损伤量化的需求日益增长，导致超声波兰姆波检测（ULWT）在各种工程应用中广泛用于无损检测（NDT）。非接触式扫描激光多普勒测振仪（SLDV）已成为一种有价值的损伤评估工具。然而，尽管对Lamb波场分析方法进行了大量研究，但快速可靠地获取全波场数据仍然是一个重大挑战，这限制了SLDV在实际工程场景中的适用性。本研究提出了一种新的基于深度学习的方法，利用时空掩膜自动编码器（STMAE）从高度欠采样的波场数据中重建全波场数据。通过利用时间序列高稀疏度Lamb波场数据，我们的方法在采样率低至5%的情况下获得了显著的重建性能。此外，我们提出了一种基于贝叶斯优化的扫描路径优化方法，该方法产生自适应的稀疏空间采样模式，用于波场重建。这种自适应采样模式与STMAE（称为AdaSTMAE）的集成，在损伤区域周围产生较低精度的波场预测误差。对采样比进行了综合参数化研究，并在单损伤和多损伤两种情况下进行了对比试验验证。与没有自适应采样策略的情况相比，自适应采样策略的实施使单损伤情况下的重建误差降低了2-16%，在损伤区域周围的多损伤情况下的重建误差降低了0.7-5%。我们的实验结果表明，该技术在波场重建方面表现出色，在不同采样比（5%-25%）下，相对于原始掩蔽自编码器（MAE），重建误差降低了87-88%。此外，采用变厚度复合材料叶片进行的跨结构验证证实了该模型具有较强的泛化能力，无需微调即可有效地重建波前畸变和速度变化。

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引用次数: 0

Modeling nonlinear scattering of phospholipid-coated microbubbles in elastic media 弹性介质中磷脂包被微泡的非线性散射建模。

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-16 DOI: 10.1016/j.ultras.2026.107964

Ali Rezaei , David Fernández Rivas , Guillaume Lajoinie , Michel Versluis

Microbubble contrast agents are well-known in the biomedical field for their ability to enhance the contrast in ultrasound imaging and to facilitate targeted drug delivery within the body. Upon injection into the vasculature, these bubbles are strongly influenced by the viscoelastic properties of surrounding soft tissues. Here, we simulate the scattered pressure from a single phospholipid-coated microbubble placed in a uniform viscoelastic medium. We use a modified Rayleigh–Plesset equation that incorporates the viscoelastic response of the phospholipid shell and a Kelvin–Voigt model to represent tissue viscoelasticity. Our simulations aim to investigate the relationship between the viscoelasticity of the medium and that of the bubble shell, and its influence on bubble dynamics as a function of driving pressure, bubble radius, and medium elastic modulus. Results show that the frequency of maximum scatter response increases with the elastic modulus of the medium. While the radial excursion of a

2.0 μ m

radius bubble can decrease by as much as 45% in a medium with an elastic modulus of 200 kPa as compared to that in water, the scattered pressure can increase by 50%. In contrast, the change in harmonic scattering is negligible: simulations predict a increase of only 5% for a

2.0 μ m

bubble when increasing the medium elasticity from 0 to 200 kPa at a driving pressure of 120 kPa. Furthermore, subharmonics generated by driving the bubble at its resonance frequency (TR) are comparable to the subharmonics generated at twice the resonance frequency at lower driving pressures. For elevated pressures the TR/T2R subharmonic ratio increases with increasing elastic modulus. This is in sharp contrast with the resonance behavior of a microbubble in water. These results bear consequences for strategies that exploit the fundamental, harmonic, and subharmonic response of microbubble contrast agents.

微泡造影剂在生物医学领域因其增强超声成像对比度和促进体内靶向药物递送的能力而闻名。在注入血管系统后，这些气泡受到周围软组织粘弹性特性的强烈影响。在这里，我们模拟了放置在均匀粘弹性介质中的单个磷脂包被微泡的分散压力。我们使用改进的Rayleigh-Plesset方程，该方程结合了磷脂壳的粘弹性响应和Kelvin-Voigt模型来表示组织粘弹性。我们的模拟旨在研究介质的粘弹性与气泡壳的粘弹性之间的关系，以及它作为驱动压力、气泡半径和介质弹性模量的函数对气泡动力学的影响。结果表明，最大散射响应频率随介质弹性模量的增大而增大。在弹性模量为200 kPa的介质中，半径为2.0μm的气泡的径向偏移量比在水中减少了45%，分散压力增加了50%。相比之下，谐波散射的变化可以忽略不计：模拟预测在120 kPa的驱动压力下，当介质弹性从0增加到200 kPa时，2.0μm气泡的谐波散射仅增加5%。此外，以其共振频率（TR）驱动气泡产生的次谐波与较低驱动压力下以两倍共振频率产生的次谐波相当。对于高压，TR/T2R次谐波比随弹性模量的增加而增加。这与微泡在水中的共振行为形成鲜明对比。这些结果为利用微泡造影剂的基本、谐波和次谐波响应的策略带来了后果。

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引用次数: 0

Design and performance of a novel mode-selectable piezoelectric ultrasonic transducer with controllable output trajectory 一种新型可控输出轨迹可选压电超声换能器的设计与性能

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-13 DOI: 10.1016/j.ultras.2026.107961

Chuanming Jia, Hongjie Zhang, Xinyue Gao, Yi Zhang

This study presents a novel mode-selectable piezoelectric ultrasonic transducer (PUT) with a traditional sandwich structure, developed through systematic integration of modular design, electro-mechanical equivalent four-terminal network method, modal optimization techniques, and vibration conversion principles. To evaluate the performance of the proposed PUT, a prototype was fabricated and underwent a series of comprehensive excitation tests. Experimental results indicate that the PUT exhibits two fundamental mechanical resonance modes: a lower-frequency mode characterized by longitudinal-bending (L-B) coupled vibration, and a higher-frequency mode corresponding to pure longitudinal (L) vibration. The proposed transducer enables flexible and seamless switching among the L mode, L-B coupled mode, and a hybrid mode that incorporates both fundamental vibrations, while maintaining excellent energy conversion stability and efficiency during prolonged operation. By adjusting the voltage amplitudes of different frequency components in a dual-frequency composite excitation signal, the vibration at the transducer’s working end can be switched among rectilinear, elliptical, and parallelogram-like trajectories. This enables direct control over the ultrasonic energy action zone. The unique combination of mode-selectable and trajectory-control capabilities gives the proposed transducer significant potential for ultrasonic-assisted precision manufacturing applications.

摘要采用模块化设计、机电等效四端网络法、模态优化技术和振动转换原理，系统集成开发了一种传统夹层结构的新型可选模态压电超声换能器。为了评估所提出的PUT的性能，制作了一个原型并进行了一系列综合激励试验。实验结果表明，PUT具有两种基本的机械共振模式：纵向-弯曲（L- b）耦合振动的低频模式和纯纵向(L)振动的高频模式。所提出的换能器能够在L模式、L- b耦合模式和混合模式之间灵活无缝地切换，结合了基本振动，同时在长时间运行期间保持出色的能量转换稳定性和效率。通过调整双频复合激励信号中不同频率分量的电压幅值，换能器工作端的振动可以在直线、椭圆和平行四边形轨迹之间切换。这样可以直接控制超声波能量作用区。模式可选和轨迹控制能力的独特组合使所提出的换能器在超声辅助精密制造应用中具有巨大的潜力。

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引用次数: 0

Composite layer formation on AZ91D magnesium alloy via temperature-assisted ultrasonic shot peening for enhanced wear resistance 通过温度辅助超声喷丸强化在AZ91D镁合金表面形成复合层，提高了AZ91D镁合金的耐磨性。

IF 4.1 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics

Pub Date : 2026-06-01 Epub Date: 2026-01-17 DOI: 10.1016/j.ultras.2026.107965

Jinrui Xiao , Xu Liang , Sentao Diao , Xincheng Xie , Lilin Zhang , Zhongwei Liang

Developing high wear resistance is crucial for the application of magnesium alloy components under extreme service conditions. In this study, temperature-assisted ultrasonic shot peening (TUSP) incorporating graphene particles was applied to enhance the surface properties of AZ91D magnesium alloy. A composite reinforced surface layer, consisting of micro-dimples, a graphene coating, and a gradient-hardened layer, was successfully fabricated on the surface. The samples treated by low temperature-assisted ultrasonic shot peening (LTUSP) achieved the highest surface hardness of 146.6 HV, corresponding to increases of approximately 69.7% and 23.0% compared with the untreated and conventional USP-treated samples, respectively. The tribological properties of the treated samples were evaluated using a ball-on-disc rotational friction tribometer under normal loads of 5, 7.5, and 10 N, with sliding speeds of 20, 30, and 40 r/min. At a normal load of 5 N and a sliding speed of 30 r/min, the LTUSP-treated samples exhibited a wear rate of approximately 1.63 × 10⁻⁴ mm³/N·m, representing reductions of 91.8% and 54.5% relative to the untreated and conventional USP samples, respectively. An in-depth study revealed that the enhanced wear resistance was primarily attributed to the composite reinforced layer, which mitigated three-body wear, direct contact, and shear failure during the sliding process. This work presents a viable approach for enhancing the wear resistance of AZ91D magnesium alloy.

开发高耐磨性对于镁合金部件在极端使用条件下的应用至关重要。在本研究中，采用温度辅助超声喷丸（TUSP）加入石墨烯颗粒来增强AZ91D镁合金的表面性能。在表面成功制备了由微韧窝、石墨烯涂层和梯度硬化层组成的复合增强表面层。经低温辅助超声喷丸（LTUSP）处理的样品表面硬度最高，达到146.6 HV，与未处理和常规usp处理的样品相比，分别提高了约69.7%和23.0%。在5、7.5和10牛的正常载荷、20、30和40 r/min的滑动速度下，使用球盘式旋转摩擦摩擦学仪评估处理后样品的摩擦学性能。在5 N的正常载荷和30 r/min的滑动速度下，ltusp处理后的样品的磨损率约为1.63 × 10-4 mm3/N·m，相对于未处理和常规USP样品分别降低了91.8%和54.5%。深入研究表明，复合材料增强层的耐磨性增强主要是由于复合材料增强层减轻了滑动过程中的三体磨损、直接接触和剪切破坏。为提高AZ91D镁合金的耐磨性提供了一条可行的途径。

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