Thin-Walled Structures最新文献_第2页

Experimental and numerical study on dynamic buckling of cylindrical shells with initial imperfections subjected to underwater explosion 水下爆炸作用下初始缺陷圆柱壳动力屈曲的实验与数值研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-26 DOI: 10.1016/j.tws.2026.114729

Chen-Xing Qu , Shao-Fei Ren , Xin-Yang Li , Qiang Zhong , Meng-Long Qiu

Dynamic buckling of imperfect cylindrical shells subjected to underwater explosion (UNDEX) is investigated by experimental and numerical approaches. Initial geometric and thickness imperfections of cylindrical shells were measured by the 3D scanning equipment and ultrasonic thickness gauge, respectively, and the experiment was conducted in a large-scale explosion basin. Then, a numerical model for predicting the dynamic buckling behavior of imperfect shells subjected to UNDEX was developed by the reverse modeling technology, and numerical simulations were conducted by the coupled acoustic-structural method. Circumferential and axial buckling modes obtained by experiment and numerical simulation are in good agreement. The shock wave induced by UNDEX typically induces localized yielding in the shell, making it more prone to buckling under the combined bubble pulsation loading and hydrostatic pressure. The buckling failure process of the imperfect shell subjected to UNDEX can be categorized into three stages: the onset of dynamic buckling, the transition of the buckling mode from lower-order to higher-order, and the final collapse. Meanwhile, hydrostatic pressure significantly influences the critical load of dynamic buckling and buckling process of the shell. Moreover, the buckling mode is governed by the distribution pattern of geometric imperfections, while larger imperfection amplitudes result in more severe buckling failure.

采用实验和数值方法研究了不完全圆柱壳在水下爆炸作用下的动态屈曲问题。利用三维扫描设备和超声测厚仪分别测量了圆柱壳的初始几何缺陷和厚度缺陷，并在大型爆炸池中进行了实验。在此基础上，利用反建模技术建立了不完全壳在UNDEX作用下动态屈曲行为的数值模型，并采用声-结构耦合方法进行了数值模拟。实验结果与数值模拟结果吻合较好。UNDEX诱导的激波通常会导致壳体局部屈服，使壳体在气泡脉动载荷和静水压力联合作用下更容易发生屈曲。不完善壳在UNDEX作用下的屈曲破坏过程可分为三个阶段：动力屈曲开始阶段、低阶屈曲模式向高阶屈曲模式转变阶段和最终破坏阶段。静水压力对壳体动屈曲和屈曲过程的临界载荷影响显著。屈曲模式受几何缺陷的分布规律支配，缺陷幅值越大，屈曲破坏越严重。

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引用次数: 0

Voronoi-driven partitioned combinatorial design method for variable-stiffness panels with experimental validation 变刚度板的voronoi驱动分区组合设计方法及试验验证

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-18 DOI: 10.1016/j.tws.2026.114688

Hongjiang Liu , Kunpeng Zhang , Hao Yang , Hao Liu , Junjie Wang , Kaiyun Zhang , Peng Hao

Variable-stiffness (VS) panels have shown significant potential for improving structural load-bearing performance. Inspired by natural cellular morphologies, this study proposes a Voronoi-driven partitioned combinatorial variable-stiffness (VPCVS) design framework for stiffened panels. A unified characterization method is developed to parameterize Voronoi-based stiffener unit cells, enabling continuous control of cell geometry and stiffness. The characterization is integrated with a surrogate-based optimization strategy to efficiently explore manufacturable stiffener layouts. Under non-uniform boundary conditions, the optimized VPCVS configuration achieves up to 47.93% improvement in load-bearing capacity compared to an orthogrid stiffened panel optimized for the same mass. By combining partitioned design and field-modulation techniques, the framework enables rational spatial distribution of stiffener morphology across the panel. The proposed method is further validated through nonlinear finite element simulations and full-scale axial compression experiments. The VPCVS panel exhibits a significantly higher critical buckling load while achieving a 36.54% reduction in stiffener weight relative to the conventional orthogrid baseline. Both numerical and experimental results confirm the effectiveness of the proposed approach for structural design and manufacturing of high-performance variable-stiffness stiffened panels.

变刚度面板在改善结构承载性能方面显示出巨大的潜力。受自然细胞形态的启发，本研究提出了一种voronoi驱动的分区组合变刚度（VPCVS）加筋板设计框架。开发了一种统一的表征方法来参数化基于voronoi的加劲单元单元，实现了单元几何形状和刚度的连续控制。该表征与基于代理的优化策略相结合，以有效地探索可制造的加强筋布局。在非均匀边界条件下，优化后的VPCVS结构与相同质量的正格栅加筋板相比，承载能力提高了47.93%。通过结合分区设计和场调制技术，该框架能够在面板上合理地分布加强筋形态。通过非线性有限元仿真和全尺寸轴压实验进一步验证了该方法的有效性。VPCVS面板显示出更高的临界屈曲载荷，同时与传统的正格栅基线相比，加强筋重量减少了36.54%。数值和实验结果均证实了该方法在高性能变刚度加筋板结构设计和制造中的有效性。

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引用次数: 0

Crack propagation in functionally graded materials using phase field model and adaptive meshless method 基于相场模型和自适应无网格方法的功能梯度材料裂纹扩展

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-16 DOI: 10.1016/j.tws.2026.114678

Qiaoling Zhang, Keliang Ren, Qiqi Wang, Wentao Ma

The phase-field fracture model (PFM) has been established as an alternative numerical tool for modeling intricate fracture phenomena. However, employing this model to study functionally graded materials (FGMs) remains computationally expensive. This is primarily due to the steep phase-field gradients induced by continuously varying material properties, which require an extremely fine discretization in numerical simulations. To overcome this challenge, this study develops an efficient adaptive meshless phase-field framework based on the radial point interpolation method (RPIM). A physically consistent multi-level refinement criterion is proposed to identify critical regions requiring high resolution, with quadtree decomposition used to insert nodes adaptively. This approach dynamically allocates computational resources while naturally handling arbitrary hanging nodes. Comprehensive numerical validations confirm that the proposed method accurately captures complex crack patterns in FGMs while significantly reducing computational cost. Furthermore, the influences of homogenization schemes, volume fraction definitions, gradient direction and gradient index on crack propagation are systematically investigated, providing valuable insights for the fracture-resistant design of FGM components. The proposed method offers a powerful numerical framework for fracture analysis in graded media.

相场断裂模型（PFM）作为模拟复杂断裂现象的一种替代数值工具已经建立起来。然而，使用该模型来研究功能梯度材料（fgm）的计算成本仍然很高。这主要是由于连续变化的材料特性引起的陡相场梯度，这在数值模拟中需要非常精细的离散化。为了克服这一挑战，本研究开发了一种基于径向点插值法（RPIM）的高效自适应无网格相场框架。利用四叉树分解自适应插入节点，提出了一种物理一致的多级细化准则来识别需要高分辨率的关键区域。这种方法动态地分配计算资源，同时自然地处理任意挂起的节点。综合数值验证表明，该方法能够准确捕获fgm中复杂的裂纹模式，同时显著降低了计算成本。此外，系统地研究了均匀化方案、体积分数定义、梯度方向和梯度指数对裂纹扩展的影响，为FGM构件的抗断裂设计提供了有价值的见解。该方法为梯度介质断裂分析提供了一个强有力的数值框架。

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引用次数: 0

Residual stress distributions in wire-arc directed energy deposited steel tubular parts 电弧定向能沉积钢管件残余应力分布

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-01-27 DOI: 10.1016/j.tws.2026.114584

Athina Spinasa , Xin Meng , Ben Weber , Leroy Gardner

Wire-arc directed energy deposition (DED-Arc), is a metal 3D printing technology that enables the production of large, intricate steel components with significant potential in structural engineering. The cyclic thermal history inherent to the DED-Arc process induces residual stresses, which can influence the structural performance of fabricated components. This study experimentally investigates residual stress distributions in seven DED-Arc steel tubular specimens fabricated using ER90S-D2 welding wire. These include three square hollow section (SHS) tubes with nominal thicknesses of 3.5 mm, 4.5 mm, and 5.5 mm, two 3.5 mm-thick circular hollow section (CHS) tubes with interpass temperatures of 150 °C and 350 °C and two 8 mm-thick oval sections with active and passive cooling. The sectioning method was used to measure residual stresses in both longitudinal and transverse directions. Released strains were recorded using a Demec gauge and, as an alternative, using digital image correlation (DIC); the results showed generally good agreement, but the accuracy of the DIC results was compromised in the case of large out-of-plane deformations. For the SHS tubes, tensile stresses appeared in the corners and compressive stresses in the middle of the faces in the longitudinal direction, while the transverse direction showed peak tensile stresses at the top and bottom. Similar distributions were observed across the SHS thicknesses, except in the thinnest tube, where local buckling altered the pattern. The CHS tubes exhibited high through-thickness bending stresses linked to interpass temperature, while membrane stresses were negligible. In the oval tubes, active cooling led to slightly higher residual membrane stresses. The presented results and findings offer key insights into the residual stress distributions in DED-Arc tubular parts, serving as a sound basis for model validation and the evaluation of structural performance.

线弧定向能沉积（d -arc）是一种金属3D打印技术，可以生产大型、复杂的钢构件，在结构工程中具有巨大的潜力。弧焊过程固有的循环热过程会产生残余应力，从而影响构件的结构性能。实验研究了用ER90S-D2焊丝制作的7个d -弧钢管试样的残余应力分布。其中包括三个标称厚度为3.5 mm， 4.5 mm和5.5 mm的方形空心截面（SHS）管，两个3.5 mm厚的圆形空心截面（CHS）管，通道间温度为150°C和350°C，两个8 mm厚的椭圆形截面，具有主动和被动冷却功能。采用截面法测量纵向和横向的残余应力。释放的菌株使用Demec测量仪记录，作为替代，使用数字图像相关（DIC）；结果显示了良好的一致性，但在大的面外变形的情况下，DIC结果的准确性受到损害。对于SHS管，纵向拉应力出现在边角，中间出现压应力，而横向拉应力峰值出现在顶部和底部。除了在最薄的管中，局部屈曲改变了模式外，在整个SHS厚度范围内观察到类似的分布。CHS管表现出与通道温度相关的高透厚弯曲应力，而膜应力可以忽略不计。在椭圆管中，主动冷却导致残余膜应力略高。本文的研究结果和发现为深入了解电弧弧焊管部件的残余应力分布提供了重要的见解，为模型验证和结构性能评估提供了良好的基础。

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引用次数: 0

A newly developed integrated framework for the multi-objective optimization of air-supported membrane structures 一种用于气支膜结构多目标优化的集成框架

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-25 DOI: 10.1016/j.tws.2026.114718

Zhen Zhang, Xiongyan Li, Wei Wang, Suduo Xue, Guanchen Liu

Designing air-supported membrane structures often presents the challenge of balancing multiple performance objectives. To address this issue, this paper presents an integrated, multi-objective optimization framework. This framework automates the process from modeling and analysis to optimization by deeply coupling the parametric platform Grasshopper with the finite element software ANSYS and embedding a multi-objective evolutionary algorithm. The research focuses on developing a systematic parametric modeling method based on NURBS theory to precisely control complex surfaces and cable-net layouts. Various engineering applications have validated the effectiveness and versatility of the integrated framework. The integrated framework solves morphological analysis and parameter optimization problems for new structures, and it also applies to reverse-identifying the zero-stress state for existing structures. The results demonstrate that the integrated framework is an efficient, reliable, automated tool for solving performance-driven design problems in air-supported membrane structures.

空气支撑膜结构的设计经常面临平衡多个性能目标的挑战。为了解决这一问题，本文提出了一个集成的多目标优化框架。该框架通过将参数化平台Grasshopper与有限元软件ANSYS深度耦合，并嵌入多目标进化算法，实现了从建模、分析到优化的全过程自动化。研究重点是开发一种基于NURBS理论的系统参数化建模方法，以精确控制复杂曲面和索网布局。各种工程应用验证了集成框架的有效性和通用性。该集成框架解决了新结构的形态分析和参数优化问题，也适用于现有结构零应力状态的反向识别。结果表明，集成框架是解决气支膜结构性能驱动设计问题的有效、可靠、自动化工具。

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引用次数: 0

Nonlinear vibrations of a novel three-phase cross-ply titanium fiber and FG-GPLRC aluminum-based laminated conical half-shells with varying thickness under combined excitations 复合激励下新型三相交叉铺层钛纤维和FG-GPLRC铝基变厚度层合锥形半壳的非线性振动

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-28 DOI: 10.1016/j.tws.2026.114705

Z.Q. Wang , W. Zhang , Y.F. Zhang

Compared with the conventional two-phase composites, three-phase titanium fiber and functionally graded graphene platelet reinforced composite (FG-GPLRC) aluminum-based structures can comprehensively enhance the structural mechanical properties and can be applied in more complex environments. This paper explores the nonlinear vibrations of a novel three-phase cross-ply titanium fiber and FG-GPLRC aluminum-based varying thickness laminated conical half-shell under the combined excitations and different boundary conditions. The thickness varies exponentially along the generatrix of three-phase conical half-shell. The equivalent mechanical properties of three-phase titanium fiber and FG-GPLRC conical half-shells are identified by the mixing rule, improved Halpin-Tsai approach and Mori-Tanaka approach. Utilizing the higher-order shear deformation theory (HSDT) and Galerkin procedure, the nonlinear ordinary differential formulations of three-phase varying thickness conical half-shells are investigated. The comparisons and convergence of the natural frequencies and nonlinear vibration responses of the conical half-shells are provided to ensure the accuracy of the theoretical formulations by employing the experiment, literature and Abaqus. The frequency-amplitude responses, chaotic dynamics and bifurcation characteristics are investigated by applying the experiment and Runge-Kutta procedure. The effects of various excitations, boundary conditions, materials and structural parameters on the nonlinear vibrations are examined. The experimental study about nonlinear forced vibration is given to explore and validate the nonlinear vibration characteristics of varying thickness conical half-shells. The results indicate that the presence of the GPLs enhances the rigidities and frequencies of three-phase varying thickness conical half-shells, while the presence of low content titanium fibers reduces the frequencies of three-phase varying thickness conical half-shells. This study guides the modeling and nonlinear vibration analysis of three-phase titanium fiber and FG-GPLRC structures with varying thickness, and offers an excellent alternative material for aerospace fairings.

与传统的两相复合材料相比，三相钛纤维和功能梯度石墨烯血小板增强复合材料（FG-GPLRC）铝基结构可以全面提高结构力学性能，可以应用于更复杂的环境。本文研究了一种新型三相交叉铺层钛纤维和FG-GPLRC铝基变厚度层状锥形半壳在不同边界条件下的非线性振动。厚度沿三相锥形半壳母线呈指数变化。采用混合规则、改进的Halpin-Tsai法和Mori-Tanaka法确定了三相钛纤维和FG-GPLRC锥形半壳的等效力学性能。利用高阶剪切变形理论（HSDT）和伽辽金过程，研究了三相变厚锥形半壳的非线性常微分方程。利用实验、文献和Abaqus对圆锥半壳的固有频率和非线性振动响应进行了比较和收敛，以保证理论公式的准确性。通过实验和龙格-库塔程序研究了其频幅响应、混沌动力学和分岔特性。考察了各种激励、边界条件、材料和结构参数对非线性振动的影响。为探索和验证变厚度锥形半壳的非线性振动特性，进行了非线性强迫振动实验研究。结果表明，gpl的存在提高了三相变厚锥形半壳的刚度和频率，而低含量钛纤维的存在降低了三相变厚锥形半壳的频率。该研究指导了三相钛纤维和FG-GPLRC变厚度结构的建模和非线性振动分析，为航空整流罩提供了一种优良的替代材料。

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引用次数: 0

Quantitative detection method for small defects in high-attenuation polyethylene pipes based on ultrasonic guided waves and chaos sensitivity 基于超声导波和混沌灵敏度的高衰减聚乙烯管道小缺陷定量检测方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-22 DOI: 10.1016/j.tws.2026.114700

Mengfei Cheng , Weiwei Zhang , Hongzhao Li , Jun Tian , Mingfang Zheng , Hongwei Ma

Owing to the strong attenuation caused by the inherent viscoelasticity of polyethylene (PE) pipes, existing NDT techniques suffer from short detection distance and insufficient sensitivity to small defects. To address this problem, this study proposes a quantitative detection method for small defects in PE pipes using ultrasonic guided waves (UGWs) and chaos system. First, the influence of excitation frequency on attenuation and waveform distortion of L(0,2) mode was explored from both theoretical and experimental perspectives, thereby determining optimal excitation frequency to extend detection range of UGW. Then, a novel signal-processing method using chaos system was proposed to overcome the problem that weak defect echoes are difficult to identify. Finally, an experimental study was conducted, in which circumferential and radial defects of different sizes (4.00 %–22.90 %) in PE pipes were located and quantified. The results demonstrated that by selecting the point of minimum attenuation within non-dispersive region, the optimal frequency for the tested pipe was determined to be 15 kHz, which can significantly extend the propagation distance to 4 m; The chaos-based signal-processing method can identify weak defect echo parameters with a signal-to-noise ratio of -20 dB, enabling quantification of a small defect with a section loss rate of 4.00 % at a distance of 1 m. This study overcomes the limitations of low detection sensitivity and short distance for UGWs in PE pipes, and provides a method for large-range and high-precision nondestructive testing of PE pipes.

由于聚乙烯（PE）管材固有的粘弹性导致的衰减较强，现有无损检测技术存在检测距离短、对小缺陷灵敏度不足的问题。针对这一问题，本研究提出了一种基于超声导波和混沌系统的PE管道小缺陷定量检测方法。首先，从理论和实验两方面探讨了激励频率对L（0,2）模式衰减和波形畸变的影响，从而确定最佳激励频率以扩大UGW的探测范围。然后，针对弱缺陷回波难以识别的问题，提出了一种基于混沌系统的信号处理方法。最后进行了实验研究，对PE管中不同尺寸（4.00% ~ 22.90%）的周向和径向缺陷进行了定位和量化。结果表明：通过选取非色散区域内衰减最小的点，确定了测试管道的最佳频率为15 kHz，可将传输距离显著延长至4 m；基于混沌的信号处理方法可以识别弱缺陷回波参数，信噪比为-20 dB，可以在1 m距离上对截面损失率为4.00%的小缺陷进行量化。该研究克服了PE管道中ugw检测灵敏度低、距离短的局限性，为PE管道的大范围、高精度无损检测提供了一种方法。

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引用次数: 0

From nature to engineering: A comprehensive mechanical response analysis of novel bio-inspired CFRP adhesive joints 从自然到工程：新型仿生CFRP粘接接头的综合力学响应分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-18 DOI: 10.1016/j.tws.2026.114675

Hossein Malekinejad , Ricardo JC. Carbas , Eduardo AS. Marques , Lucas FM. da Silva

For effective adhesive joint design, both strength and toughness must be considered. This work investigates bio-inspired carbon fiber reinforced polymer (CFRP) substrates, replicating the natural architecture of the dactyl club, to enhance the mechanical performance of bonded joints. The CFRP substrates were stacked in gradually increasing ply angles to mimic the dactyl club microstructure. Three additional stacking sequences were considered: conventional helicoidal (constant ply angle change), unidirectional (UD), and quasi-isotropic (QI). To evaluate the proposed novel gradual helicoidal concept, composite single-lap joints (SLJs) with all stacking sequences were tested under quasi-static four-point bending. The best-performing configurations (gradual helicoidal and UD) along with QI joints, were subsequently tested under four-point bending fatigue. Cohesive element-based numerical simulations were also employed to predict the influence of stacking sequence on joint strength and toughness. Results showed that maximum load was similar for gradual helicoidal and UD joints and higher than for conventional helicoidal and QI SLJs. The energy absorption capacity of gradual helicoidal joints was significantly improved, with 46% and 115% higher values compared to UD and QI joints, respectively. Under fatigue loading, gradual helicoidal (G-type) single-lap joints exhibited enhanced damage tolerance. At load levels of 43% and 50%, the fatigue tests for the G-type joints were terminated without failure. At these load levels, the G-type joints sustained 140% and 207% more cycles, respectively, than the UD-type joints, which failed. After fatigue loading, the G-type joints retained high residual strength, corresponding to 82% and 70% of their static strength.

为了进行有效的粘接设计，必须同时考虑强度和韧性。这项工作研究了仿生碳纤维增强聚合物（CFRP）基板，复制了dactyl俱乐部的自然结构，以提高粘合关节的机械性能。将CFRP基板以逐渐增大的铺层角度堆叠，模拟dactyl棒状结构。另外考虑了三种堆叠顺序：常规螺旋（铺层角度恒定变化）、单向（UD）和准各向同性（QI）。为了评价所提出的渐进式螺旋结构的新概念，在准静态四点弯曲条件下对具有所有堆叠顺序的复合材料单搭接接头进行了测试。随后在四点弯曲疲劳下测试了性能最佳的配置（渐进性螺旋形和UD形）以及QI关节。基于内聚元素的数值模拟预测了堆砌顺序对接头强度和韧性的影响。结果表明，渐进式螺旋关节和UD关节的最大载荷相似，但高于常规螺旋关节和QI关节的最大载荷。渐进式螺旋关节的吸能能力明显提高，比UD和QI关节分别提高46%和115%。在疲劳载荷作用下，渐进式螺旋（g型）单搭接具有较强的损伤容忍度。在43%和50%载荷水平下，g型接头的疲劳试验没有失效。在这些荷载水平下，g型接头比失效的ud型接头分别多承受140%和207%的循环次数。疲劳加载后，g型接头的残余强度较高，分别为其静强度的82%和70%。

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引用次数: 0

A general aerodynamic–thermal–structural coupling method for predicting re-entry failure mechanism of spacecraft breakup structures 一种预测航天器破碎结构再入失效机理的通用气动-热-结构耦合方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-25 DOI: 10.1016/j.tws.2026.114716

Zhihui Liu , Zhihui Li , Wenqiang Hu , Quanou Yang , Qiang Ma

An aerodynamic–thermal–structural (ATS) coupling method is developed to simulate the thermo-mechanical response and potential failure behavior of spacecraft breakup structures during re-entry. The proposed method integrates Navier–Stokes solver with dynamic nonlinear thermo-mechanical finite element algorithm using an inverse distance weighting interpolation scheme at the fluid–structure interface. The accuracy of the proposed ATS coupling method is validated against a canonical wind tunnel experiment involving a stainless-steel cylindrical structure. The comparison of shock location, surface pressure, heat flux, and structural thermo-mechanical response demonstrates the reliability and predictive capability of the developed multi-physics coupling framework. Then, the method is further applied to analyze a representative propulsion system composed of fuel tanks, gas cylinders, cone platform and supporting frame structures subjected to aerodynamic loading from 90 km to 75 km re-entry altitudes. Comparative studies using four different algorithm schemes reveal that the direct coupling (DC) method has superior accuracy to the sequential coupling (SC) method in capturing thermo-mechanical coupling behavior, especially under extreme aerodynamic heating. The results show that the load-bearing cone platform first reaches the material melting point at approximately 80.6 km altitude, indicating potential melting initiation, while the supporting frame, gas cylinders and fuel tanks remain below their melting thresholds at these altitudes. Finally, a detailed re-entry analysis of an orbital control engine is performed to investigate the effect of re-entry angle of attack (AOA) on potential thermo-mechanical failure behavior. Results show that increasing the magnitude of the AOA intensifies surface thermal loads, leading to elevated temperatures, displacements, and thermal stresses. The proposed ATS method offers a robust computational tool for assessing the failure evolution of spacecraft components during re-entry.

提出了一种气动-热-结构（ATS）耦合方法，用于模拟航天器再入过程中解体结构的热-力学响应和潜在失效行为。该方法在流固界面处采用逆距离加权插值方法，将Navier-Stokes求解法与动态非线性热-机械有限元算法相结合。通过不锈钢圆柱结构典型风洞实验验证了ATS耦合方法的准确性。通过对激波位置、表面压力、热流密度和结构热-力学响应的比较，验证了所建立的多物理场耦合框架的可靠性和预测能力。然后，将该方法进一步应用于由油箱、气瓶、锥平台和支撑框架结构组成的具有代表性的推进系统在再入高度90 ~ 75 km的气动载荷作用下的分析。通过对四种不同算法方案的对比研究表明，直接耦合（DC）方法在捕获热-机械耦合行为方面优于顺序耦合（SC）方法，特别是在极端气动加热条件下。结果表明，承载锥体平台首先在海拔80.6 km处达到材料熔点，预示着潜在的熔化开始，而支撑架、气瓶和燃料箱在该高度仍低于其熔化阈值。最后，对轨道控制发动机进行了详细的再入分析，研究了再入攻角对潜在热机械失效行为的影响。结果表明，增加AOA的大小会加剧表面热载荷，导致温度、位移和热应力升高。提出的ATS方法为评估航天器部件在再入过程中的失效演变提供了一个可靠的计算工具。

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引用次数: 0

Distribution optimization of NES cells on pipes conveying fluid 流体输送管道上NES细胞的分布优化

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-14 DOI: 10.1016/j.tws.2026.114680

Yu-Fei Shao, Hu Ding

To control multi-mode nonlinear vibrations in fluid-conveying pipe systems subjected to fluid-structure interaction and external excitations, this paper proposes a synergistic vibration reduction strategy based on multiple nonlinear energy sink (NES) cells. By integrating Euler-Bernoulli beam theory with nonlinear dynamics, a fluid-structure interaction dynamic model incorporating multiple NES cells is established. The system response is analyzed using the Galerkin truncation method (GTM) and the harmonic balance method (HBM). To circumvent the high computational cost of traditional nonlinear dynamic optimization, a novel “modal contribution degree” (MCD) index is proposed. Combined with the particle swarm optimization (PSO) algorithm, this index quantifies the potential of NESs to capture energy from specific modes, thereby facilitating rapid optimization of their spatial layout. The results indicate that the optimized NES cells exhibit a spontaneous clustering characteristic towards modal antinodes, achieving efficient synergistic suppression of the first two vibration modes, with vibration reduction efficiencies exceeding 70 % and 60 %, respectively. Parametric analysis further confirms that the optimal NES configuration demonstrates excellent robustness against variations in fluid velocity and external excitation intensity. Notably, the proposed MCD strategy increases computational efficiency by four orders of magnitude compared to the traditional HBM approach while maintaining high accuracy, providing solid theoretical support for the multi-mode vibration control of fluid-conveying pipe systems.

为了控制流固耦合和外界激励下输送管道系统的多模态非线性振动，提出了一种基于多非线性能量汇单元的协同减振策略。将欧拉-伯努利梁理论与非线性动力学相结合，建立了包含多个NES单元的流固耦合动力学模型。采用伽辽金截断法（GTM）和谐波平衡法（HBM）分析了系统的响应。针对传统非线性动态优化计算量大的问题，提出了一种新的“模态贡献度”指标。结合粒子群优化（PSO）算法，该指标量化了NESs从特定模式捕获能量的潜力，从而促进了其空间布局的快速优化。结果表明，优化后的NES细胞具有向模态前节点自发聚集的特性，对前两种振动模式实现了有效的协同抑制，减振效率分别超过70%和60%。参数分析进一步证实，最优的NES配置对流体速度和外部激励强度的变化具有出色的鲁棒性。值得注意的是，与传统的HBM方法相比，所提出的MCD策略的计算效率提高了4个数量级，同时保持了较高的精度，为输送管道系统的多模态振动控制提供了坚实的理论支持。

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