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A sixth-order method for large deflection bending analysis of complex plates with multiple holes 多孔复杂板大挠度弯曲分析的六阶方法
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-10-11 DOI: 10.1007/s10409-024-24271-x
Yonggu Feng  (, ), Youhe Zhou  (, ), Jizeng Wang  (, )

The challenge of solving nonlinear problems in multi-connected domains with high accuracy has garnered significant interest. In this paper, we propose a unified wavelet solution method for accurately solving nonlinear boundary value problems on a two-dimensional (2D) arbitrary multi-connected domain. We apply this method to solve large deflection bending problems of complex plates with holes. Our solution method simplifies the treatment of the 2D multi-connected domain by utilizing a natural discretization approach that divides it into a series of one-dimensional (1D) intervals. This approach establishes a fundamental relationship between the highest-order derivative in the governing equation of the problem and the remaining lower-order derivatives. By combining a wavelet high accuracy integral approximation format on 1D intervals, where the convergence order remains constant regardless of the number of integration folds, with the collocation method, we obtain a system of algebraic equations that only includes discrete point values of the highest order derivative. In this process, the boundary conditions are automatically replaced using integration constants, eliminating the need for additional processing. Error estimation and numerical results demonstrate that the accuracy of this method is unaffected by the degree of nonlinearity of the equations. When solving the bending problem of multi-perforated complex-shaped plates under consideration, it is evident that directly using higher-order derivatives as unknown functions significantly improves the accuracy of stress calculation, even when the stress exhibits large gradient variations. Moreover, compared to the finite element method, the wavelet method requires significantly fewer nodes to achieve the same level of accuracy. Ultimately, the method achieves a sixth-order accuracy and resembles the treatment of one-dimensional problems during the solution process, effectively avoiding the need for the complex 2D meshing process typically required by conventional methods when solving problems with multi-connected domains.

如何高精度地求解多连接域中的非线性问题已引起人们的极大兴趣。本文提出了一种统一的小波求解方法,用于精确求解二维(2D)任意多连接域上的非线性边界值问题。我们将这种方法应用于解决带孔复杂板材的大挠度弯曲问题。我们的求解方法利用自然离散化方法,将二维多连接域划分为一系列一维(1D)区间,从而简化了二维多连接域的处理。这种方法在问题控制方程中的最高阶导数与其余低阶导数之间建立了基本关系。通过将一维区间上的小波高精度积分近似格式(无论积分折叠次数多少,收敛阶数保持不变)与配位法相结合,我们得到了一个只包含最高阶导数离散点值的代数方程系统。在此过程中,边界条件会自动用积分常数代替,无需额外处理。误差估计和数值结果表明,这种方法的精度不受方程非线性程度的影响。在解决所考虑的多孔复杂形状板材的弯曲问题时,直接使用高阶导数作为未知函数显然能显著提高应力计算的精度,即使在应力呈现较大梯度变化时也是如此。此外,与有限元方法相比,小波方法在达到相同精度水平时所需的节点数量要少得多。最终,该方法达到了六阶精度,在求解过程中类似于处理一维问题,有效避免了传统方法在求解多连接域问题时通常需要的复杂二维网格划分过程。
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引用次数: 0
A novel quasi-zero stiffness isolator with designable stiffness using cam-roller-spring-rod mechanism 利用凸轮-滚子-弹簧-连杆机构设计刚度可调的新型准零刚度隔振器
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-10-11 DOI: 10.1007/s10409-024-24210-x
Yonglei Zhang  (, ), Hao Wen  (, ), Haiyan Hu  (, ), Dongping Jin  (, )

Quasi-zero stiffness (QZS) isolators have received considerable attention over the past years due to their outstanding vibration isolation performance in low-frequency bands. However, traditional mechanisms for achieving QZS suffer from low stiffness regions and significant nonlinear restoring forces with hardening characteristics, often struggling to withstand excitations with high amplitude. This paper presents a novel QZS vibration isolator that utilizes a more compact spring-rod mechanism (SRM) to provide primary negative stiffness. The nonlinearity of SRM is adjustable via altering the raceway of its spring-rod end, along with the compensatory force provided by the cam-roller mechanism so as to avoid complex nonlinear behaviors. The absolute zero stiffness can be achieved by a well-designed raceway curve with a concise mathematical expression. The nonlinear stiffness with softening properties can also be achieved by parameter adjustment. The study begins with the force-displacement relationship of the integrated mechanism first, followed by the design theory of the cam profile. The dynamic response and absolute displacement transmissibility of the isolation system are obtained based on the harmonic balance method. The experimental results show that the proposed vibration isolator maintains relatively low-dynamic stiffness even under non-ideal conditions, and exhibits enhanced vibration isolation performance compared to the corresponding linear isolator.

准零刚度(QZS)隔振器由于在低频段具有出色的隔振性能,在过去几年里受到了广泛关注。然而,实现准零刚度(QZS)的传统机制存在低刚度区域和具有硬化特性的显著非线性恢复力,往往难以承受高振幅激励。本文介绍了一种新型 QZS 隔振器,它利用更紧凑的弹簧杆机构(SRM)来提供主要负刚度。SRM 的非线性可通过改变其弹簧杆端部的滚道以及凸轮滚子机构提供的补偿力来调节,从而避免复杂的非线性行为。通过精心设计的滚道曲线和简洁的数学表达式,可实现绝对零刚度。具有软化特性的非线性刚度也可以通过参数调整来实现。研究首先从综合机构的力-位移关系入手,然后是凸轮轮廓的设计理论。根据谐波平衡法,得到了隔振系统的动态响应和绝对位移传递率。实验结果表明,所提出的隔振器即使在非理想条件下也能保持相对较低的动态刚度,与相应的线性隔振器相比,隔振性能得到了提高。
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引用次数: 0
Voids and cracks detection in bulk superconductors through magnetic field and displacement signals 通过磁场和位移信号检测块状超导体中的空洞和裂缝
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-25 DOI: 10.1007/s10409-024-24327-x
Dongming An  (, ), Pengpeng Shi  (, ), Xiaofan Gou  (, )

Large-grain REBa2Cu3O7−δ (REBCO, RE = rare earth) bulk superconductors offer promising magnetic field trapping capabilities due to their high critical current density, making them ideal for many important applications such as trapped field magnets. However, for such large-grain superconductor bulks, there are lots of voids and cracks forming during the process of melting preparation, and some of them can be up to hundreds of microns or even millimeters in size. Consequently, these larger size voids/cracks pose a great threat to the strength of the bulks due to the inherent brittleness of superconductor REBCO materials. In order to ensure the operational safety of related superconducting devices with bulk superconductors, it is firstly important to accurately detect these voids/cracks in them. In this paper, we proposed a method for quantitatively evaluating multiple voids/cracks in bulk superconductors through the magnetic field and displacement response signals at superconductor bulk surface. The proposed method utilizes a damage index constructed from the magnetic field signals and displacement responses to identify the number and preliminary location of multiple defects. By dividing the detection area into subdomains and combining the magnetic field signals with displacement responses within each subdomain, a particle swarm algorithm was employed to evaluate the location and size parameters of the defects. In contrast to other evaluation methods using only magnetic field or displacement response signals, the combined evaluation method using both signals can identify the number of cracks effectively. Numerical studies demonstrate that the morphology of voids and cracks reconstructed using the proposed algorithm ideally matches real defects and is applicable to cases where voids and cracks coexist. This study provides a theoretical basis for the quantitative detection of voids/cracks in bulk superconductors.

大晶粒 REBa2Cu3O7-δ(REBCO,RE = 稀土)块状超导体因其临界电流密度高而具有良好的磁场捕获能力,是许多重要应用(如捕获磁场磁铁)的理想选择。然而,对于这种大晶粒超导体块体,在熔化制备过程中会形成大量空隙和裂缝,其中一些空隙和裂缝的尺寸可达数百微米甚至毫米。因此,由于超导体 REBCO 材料固有的脆性,这些较大尺寸的空隙/裂缝会对大块材料的强度造成极大威胁。为了确保使用块状超导体的相关超导设备的运行安全,首先必须准确检测其中的空洞/裂缝。在本文中,我们提出了一种通过超导体体表面的磁场和位移响应信号来定量评估体超导体中多重空洞/裂纹的方法。该方法利用由磁场信号和位移响应构建的损伤指数来识别多重缺陷的数量和初步位置。通过将检测区域划分为若干子域,并结合每个子域内的磁场信号和位移响应,采用粒子群算法来评估缺陷的位置和尺寸参数。与其他仅使用磁场或位移响应信号的评估方法相比,使用这两种信号的组合评估方法能有效识别裂纹的数量。数值研究表明,使用所提出的算法重建的空洞和裂缝形态与实际缺陷非常吻合,并且适用于空洞和裂缝共存的情况。这项研究为定量检测块状超导体中的空洞/裂纹提供了理论依据。
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引用次数: 0
Radiation investigation behind 4.7 km/s shock waves with nitrogen using a square section shock tube 使用方形截面冲击管对 4.7 km/s 冲击波背后的氮辐射进行研究
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-23 DOI: 10.1007/s10409-024-24258-x
Senhao Zhang  (, ), Yuzhe Zhang  (, ), Yixin Xu  (, ), Tianrui Bai  (, ), Kai Luo  (, ), Renjie Li  (, ), Qiu Wang  (, ), Xin Lin  (, ), Fei Li  (, )

The thermochemical non-equilibrium phenomena encountered by hypersonic vehicles present significant challenges in their design. To investigate the thermochemical reaction flow behind shock waves, the non-equilibrium radiation in the visible range using a shock tube was studied. Experiments were conducted with a shock velocity of 4.7 km/s, using nitrogen at a pressure of 20 Pa. To address measurement difficulties associated with weak radiation, a special square section shock tube with a side length of 380 mm was utilized. A high-speed camera characterized the shock wave’s morphology, and a spectrograph and a monochromator captured the radiation. The spectra were analyzed, and the numerical spectra were compared with experimental results, showing a close match. Temperature changes behind the shock wave were obtained and compared with numerical predictions. The findings indicate that the vibrational temperatures are overestimated, while the vibrational relaxation time is likely underestimated, due to the oversimplified portrayals of the non-equilibrium relaxation process in the models. Additionally, both experimental and simulated time-resolved profiles of radiation intensity at specific wavelengths were analyzed. The gathered data aims to enhance computational fluid dynamics codes and radiation models, improving their predictive accuracy.

高超音速飞行器遇到的热化学非平衡现象给其设计带来了巨大挑战。为了研究冲击波背后的热化学反应流,我们利用冲击管研究了可见光范围内的非平衡辐射。实验使用压力为 20 Pa 的氮气,冲击速度为 4.7 km/s。为了解决与弱辐射有关的测量困难,使用了边长为 380 毫米的特殊方形截面冲击管。高速照相机记录冲击波的形态,摄谱仪和单色仪捕捉辐射。对光谱进行了分析,并将数值光谱与实验结果进行了比较,结果显示两者非常接近。获得了冲击波后的温度变化,并与数值预测进行了比较。研究结果表明,由于模型对非平衡弛豫过程的描述过于简化,振动温度被高估,而振动弛豫时间可能被低估。此外,还分析了特定波长辐射强度的实验和模拟时间分辨曲线。所收集的数据旨在增强计算流体动力学代码和辐射模型,提高其预测准确性。
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引用次数: 0
Introducing and analyzing a periodic pipe-in-pipe model for broadband ultra-low-frequency vibration reduction in fluid-conveying pipes 引入并分析用于降低流体输送管道宽带超低频振动的周期性管中管模型
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-23 DOI: 10.1007/s10409-024-24176-x
Mohammad Hajhosseini

A new model of periodic structure is proposed and analyzed. This structure is composed of an inner fluid-conveying pipe with periodic material arrangement carrying periodic arrays of outer cantilever pipes. The generalized differential quadrature rule (GDQR) method combined with the Bloch theorem is used to calculate the vibration band gaps of the structure. Results are verified by the forced vibration responses obtained using the GDQR method. Results indicate that the first two band gaps of the fluid-conveying pipe with periodic material arrangement can get close to each other and move to low frequency regions by changing the length of cantilever pipes. For high fluid velocity values in which the first band gap starts from zero frequency, since the second band is very close to the first band, this periodic structure can be used for vibration reduction over a wide band gap starting from zero frequency. Based on these results, it can be concluded that instead of increasing the total size of the periodic structure, these periodic arrays of cantilever pipes can be implemented to create a wide ultra-low-frequency band gap. Finally, verification of the GDQR method shows that it can be used as a precise numerical method for vibration analysis of the structures such as fluid-conveying pipes and moving belts.

本文提出并分析了一种新的周期性结构模型。该结构由具有周期性材料排列的内流体输送管和周期性排列的外悬臂管组成。采用广义微分正交规则(GDQR)方法结合布洛赫定理计算该结构的振动带间隙。使用 GDQR 方法获得的强迫振动响应对结果进行了验证。结果表明,通过改变悬臂管的长度,具有周期性材料排列的流体输送管的前两个频带间隙可以相互靠近并移动到低频区域。对于第一频带隙从零频率开始的高流体速度值,由于第二频带与第一频带非常接近,这种周期性结构可用于减小从零频率开始的宽频带隙的振动。基于这些结果,我们可以得出结论,与其增加周期性结构的总尺寸,不如采用这些悬臂管周期性阵列来创建一个宽的超低频带隙。最后,对 GDQR 方法的验证表明,它可以作为一种精确的数值方法,用于流体输送管道和移动皮带等结构的振动分析。
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引用次数: 0
Aerodynamic/control coupling optimization of reentry vehicle under wide speed range 再入飞行器在宽速度范围内的空气动力/控制耦合优化
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-21 DOI: 10.1007/s10409-024-24259-x
Lulu Jiang  (, ), Chao Dong  (, ), Xin Pan  (, ), Gang Chen  (, )

The high-speed reentry vehicle operates across a broad range of speeds and spatial domains, where optimal aerodynamic shapes for different speeds are contradictory. This makes it challenging for a single-Mach optimization design to meet aerodynamic performance requirements throughout the vehicle’s flight envelope. Additionally, the strong coupling between aerodynamics and control adds complexity, as fluctuations in aerodynamic parameters due to speed variations complicate control system design. To address these challenges, this study proposes an aerodynamic/control coupling optimization design approach. This method, based on aerodynamic optimization principles, incorporates active control technology, treating aerodynamic layout and control system design as primary components during the conceptual design phase. By integrating the design and evaluation of aerodynamics and control, the approach aims to reduce design iterations and enhance overall flight performance. The comprehensive design of the rotary reentry vehicle, using this optimization strategy, effectively balances performance at supersonic and hypersonic speeds. The results show that the integrated design model meets aerodynamic and control performance requirements over a broader range of Mach numbers, preventing performance degradation due to deviations from the design Mach number, and providing a practical solution for high-speed reentry vehicle design.

高速再入飞行器的运行速度和空间域范围很广,不同速度下的最佳气动外形相互矛盾。因此,要在飞行器的整个飞行包线内满足气动性能要求,对单一机械优化设计来说是一项挑战。此外,空气动力学和控制之间的强耦合增加了复杂性,因为速度变化导致的空气动力学参数波动使控制系统设计变得复杂。为了应对这些挑战,本研究提出了一种空气动力学/控制耦合优化设计方法。该方法以空气动力学优化原理为基础,结合主动控制技术,将空气动力学布局和控制系统设计作为概念设计阶段的主要组成部分。通过整合空气动力学和控制的设计与评估,该方法旨在减少设计迭代,提高整体飞行性能。旋转再入飞行器的综合设计采用了这种优化策略,有效地平衡了超音速和高超声速的性能。结果表明,综合设计模型在更大的马赫数范围内满足了气动和控制性能要求,防止了因偏离设计马赫数而导致的性能下降,为高速再入飞行器设计提供了实用的解决方案。
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引用次数: 0
A body-fitted adaptive mesh and Helmholtz-type filter based parameterized level-set method for structural topology optimization 基于体拟合自适应网格和亥姆霍兹型滤波器的参数化水平集方法,用于结构拓扑优化
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-21 DOI: 10.1007/s10409-024-24119-x
Yijie Lu  (, ), Xueying Chang  (, ), Zhengwei Zhang  (, ), Hui Liu  (, ), Yanguo Zhou  (, ), Hao Li  (, )

Parameterized level-set method (PLSM) has been proposed and developed for many years, and is renowned for its efficacy in addressing topology optimization challenges associated with intricate boundaries and nucleation of new holes. However, most pertinent investigations in the field rely predominantly on fixed background mesh, which is never remeshed. Consequently, the mesh element partitioned by material interface during the optimization process necessitates approximation by using artificial interpolation models to obtain its element stiffness or other properties. This paper introduces a novel approach to topology optimization by integrating the PLSM with body-fitted adaptive mesh and Helmholtz-type filter. Primarily, combining the PLSM with body-fitted adaptive mesh enables the regeneration of mesh based on the zero level-set interface. This not only precludes the direct traversal of the material interface through the mesh element during the topology optimization process, but also improves the accuracy of calculation. Additionally, the incorporation of a Helmholtz-type partial differential equation filter, relying solely on mesh information essential for finite element discretization, serves to regulate the topological complexity and the minimum feature size of the optimized structure. Leveraging these advantages, the topology optimization program demonstrates its versatility by successfully addressing various design problems, encompassing the minimum mean compliance problem and minimum energy dissipation problem. Ultimately, the result of numerical example indicates that the optimized structure exhibits a distinct and smooth boundary, affirming the effective control over both topological complexity and the minimum feature size of the optimized structure.

参数化水平集法(PLSM)已提出并发展多年,因其在解决与错综复杂的边界和新孔成核相关的拓扑优化难题方面的功效而闻名。然而,该领域的大多数相关研究都主要依赖于固定的背景网格,而这种网格是永远不会重修的。因此,在优化过程中,按材料界面划分的网格元素必须使用人工插值模型进行近似,以获得其元素刚度或其他属性。本文介绍了一种拓扑优化的新方法,它将 PLSM 与体拟自适应网格和 Helmholtz 型滤波器相结合。首先,将 PLSM 与体拟合自适应网格相结合,可实现基于零水平集界面的网格再生。这不仅避免了在拓扑优化过程中通过网格元素直接遍历材料界面,还提高了计算精度。此外,亥姆霍兹型偏微分方程滤波器的加入,仅仅依靠有限元离散化所必需的网格信息,就能调节拓扑复杂性和优化结构的最小特征尺寸。利用这些优势,拓扑优化程序成功解决了各种设计问题,包括最小平均顺应性问题和最小能量耗散问题,展示了其多功能性。最终,数值示例结果表明,优化后的结构呈现出明显而平滑的边界,证实了对拓扑复杂性和优化结构最小特征尺寸的有效控制。
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引用次数: 0
A cyclic self-enhancement technique for complex defect profile reconstruction based on thermographic evaluation 基于热成像评估的复杂缺陷轮廓重建循环自增强技术
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-21 DOI: 10.1007/s10409-024-24076-x
Haochen Liu  (, ), Shuozhi Wang  (, ), Yifan Zhao  (, ), Kailun Deng  (, ), Zhenmao Chen  (, )

Although machine Learning has demonstrated exceptional applicability in thermographic inspection, precise defect reconstruction is still challenging, especially for complex defect profiles with limited defect sample diversity. Thus, this paper proposes a self-enhancement defect reconstruction technique based on cycle-consistent generative adversarial network (Cycle-GAN) that accurately characterises complex defect profiles and generates reliable artificial thermal images for dataset augmentation, enhancing defect characterisation. By using a synthetic dataset from simulation and experiments, the network overcomes the limited samples problem by learning the diversity of complex defects from finite element modelling and obtaining the thermography uncertainty patterns from practical experiments. Then, an iterative strategy with a self-enhancement capability optimises the characterisation accuracy and data generation performance. The designed loss function structure with cycle consistency and identity loss constrains the GAN’s transfer variation to guarantee augmented data quality and defect reconstruction accuracy simultaneously, while the self-enhancement results significantly improve accuracy in thermal images and defect profile reconstruction. The experimental results demonstrate the feasibility of the proposed method by attaining high accuracy with optimal loss norm for defect profile reconstruction with a Recall score over 0.92. The scalability investigation of different materials and defect types is also discussed, highlighting its capability for diverse thermography quantification and automated inspection scenarios.

尽管机器学习在热成像检测领域已显示出卓越的适用性,但精确的缺陷重构仍具有挑战性,尤其是对于缺陷样本多样性有限的复杂缺陷剖面。因此,本文提出了一种基于循环一致性生成对抗网络(Cycle-GAN)的自增强缺陷重构技术,该技术可准确表征复杂的缺陷轮廓,并生成可靠的人工热图像用于数据集扩增,从而增强缺陷表征能力。通过使用来自模拟和实验的合成数据集,该网络从有限元建模中学习复杂缺陷的多样性,并从实际实验中获取热成像不确定性模式,从而克服了样本有限的问题。然后,一种具有自我增强能力的迭代策略优化了表征精度和数据生成性能。所设计的损失函数结构具有周期一致性和身份损失,可限制 GAN 的转移变化,从而同时保证增强的数据质量和缺陷重构精度,而自我增强的结果则显著提高了热图像和缺陷轮廓重构的精度。实验结果证明了所提方法的可行性,该方法在缺陷轮廓重建中以最佳损失规范获得了较高的精度,召回得分超过 0.92。此外,还讨论了不同材料和缺陷类型的可扩展性研究,突出了该方法在各种热成像量化和自动检测场景中的能力。
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引用次数: 0
The impacts of variable nonlocal, length-scale factors and surface energy on hygro-thermo-mechanical vibration and buckling behaviors of viscoelastic FGP nanosheet on viscoelastic medium 粘弹性 FGP 纳米片在粘弹性介质上的非局部、长度尺度因子和表面能变量对湿热机械振动和屈曲行为的影响
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-21 DOI: 10.1007/s10409-024-24135-x
Hong Hieu Le, Van Ke Tran, Nhan Thinh Hoang, Nguyen Ngoc My Huong

The main goal of this paper is to present the free vibration and buckling of viscoelastic functionally graded porous (FGP) nanosheet based on nonlocal strain gradient (NSGT) and surface elasticity theories. The nanosheets are placed on a visco-Pasternak medium in a hygro-temperature environment with nonlinear rules. The viscoelastic material characteristics of nanosheets are based on Kelvin’s model. The unique point of this study is to consider the change of nonlocal and length-scale coefficients according to thickness, similar to the laws of the material properties. The Galerkin approach based on the Kirchhoff-love plate theory is applied to determine the natural frequency and critical buckling load of the viscoelastic FGP nanosheet with various boundary conditions. The accuracy of the proposed method is verified through reliable publications. The outcome of this study highlights the significant effects of the nonlocal and length-scale parameters on the vibration and buckling behaviors of viscoelastic FGP nanosheets.

本文的主要目的是基于非局部应变梯度(NSGT)和表面弹性理论,介绍粘弹性功能梯度多孔(FGP)纳米片的自由振动和屈曲。纳米片被置于具有非线性规则的湿温环境中的粘弹性帕斯捷尔纳克介质上。纳米片的粘弹性材料特性基于开尔文模型。这项研究的独特之处在于考虑了非局部系数和长度尺度系数随厚度的变化,这与材料特性的规律相似。基于 Kirchhoff-love 板理论的 Galerkin 方法被应用于确定各种边界条件下粘弹性 FGP 纳米板的固有频率和临界屈曲载荷。通过可靠的出版物验证了所提出方法的准确性。本研究的结果凸显了非局部参数和长度尺度参数对粘弹性 FGP 纳米板振动和屈曲行为的显著影响。
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引用次数: 0
A step-by-step Chebyshev space-time spectral method for force vibration of functionally graded structures 功能分级结构力振动的分步切比雪夫时空谱方法
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-20 DOI: 10.1007/s10409-024-24193-x
Haizhou Liu  (, ), Yixin Huang  (, ), Yang Zhao  (, )

This paper proposes a new step-by-step Chebyshev space-time spectral method to analyze the force vibration of functionally graded material structures. Although traditional space-time spectral methods can reduce the accuracy mismatch between temporal low-order finite difference and spatial high-order discretization, their time collocation points must increase dramatically to solve highly oscillatory solutions of structural vibration, which results in a surge in computing time and a decrease in accuracy. To address this problem, we introduced the step-by-step idea in the space-time spectral method. The Chebyshev polynomials and Lagrange’s equation were applied to derive discrete spatial governing equations, and a matrix projection method was used to map the calculation results of previous steps as the initial conditions of the subsequent steps. A series of numerical experiments were carried out. The results of the proposed method were compared with those obtained by traditional space-time spectral methods, which showed that higher accuracy could be achieved in a shorter computation time than the latter in highly oscillatory cases.

本文提出了一种新的分步切比雪夫时空谱方法来分析功能梯度材料结构的受力振动。传统的时空谱方法虽然可以减小时间低阶有限差分与空间高阶离散之间的精度不匹配,但要求解结构振动的高振荡解,其时间配置点必须大幅增加,从而导致计算时间激增,精度下降。为解决这一问题,我们在时空谱方法中引入了分步思想。应用切比雪夫多项式和拉格朗日方程推导出离散空间控制方程,并采用矩阵投影法将前一步的计算结果映射为后一步的初始条件。进行了一系列数值实验。实验结果与传统时空谱方法的结果进行了比较,结果表明,在高度振荡的情况下,前者能以比后者更短的计算时间获得更高的精度。
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Acta Mechanica Sinica
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