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Theory and Manipulation of Flexural Waves 认领 引用 被引量：1
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作者 Feng Liu Liyun Cao +2 位作者 Xiao-Lei Tang Yan-Feng Wang Yue-Sheng Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第4期402-432,共31页
Flexural waves constitute a fundamental class of elastic waves in thin structures and play a central role in vibration,noise,and energy transport across a wide range of engineering systems.This review provides a compr... Flexural waves constitute a fundamental class of elastic waves in thin structures and play a central role in vibration,noise,and energy transport across a wide range of engineering systems.This review provides a comprehensive overview of the theoretical foundations and manipulation strategies of flexural waves.We begin with the classical Kirchhoff–Love plate theory and related models,dispersion characteristics,and range of validity.Building on this foundation,we summarize recent advances in flexural-wave manipulation using elastic metasurfaces,which enable anomalous reflection,wavefront shaping,and mode conversion through subwavelength structural design.We further highlight emerging developments in topological physics and bound states in the continuum(BICs)within flexural wave systems,including defect-immune transport governed by lattice topology,non-radiating embedded modes,and high-quality(high-Q)factor resonances.These approaches illustrate the rapid evolution of flexural waves from classical vibration theory to a modern multidisciplinary field.The review concludes by outlining key challenges and promising research directions,including integrated wave-control strategies and emerging concepts for next-generation flexural-wave devices. 展开更多
关键词 Flexural wave Elastic metasurface Bound state in the continuum(BIC) Topological physics
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Molecular dynamics simulation on surface hydration of different cationic montmorillonite 认领 引用 被引量：1
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作者 WANG Yue-peng LIU Xin +1 位作者 LIU Xiang-jun TANG Shi-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期944-967,共24页
In order to reveal the mechanism of surface hydration differences for different types of montmorillonite crystals,the hydration processes of sodium,potassium,and calcium montmorillonite were simulated by molecular dyn... In order to reveal the mechanism of surface hydration differences for different types of montmorillonite crystals,the hydration processes of sodium,potassium,and calcium montmorillonite were simulated by molecular dynamics.These simulation results show that with the increase of the number of water molecules,the interlayer spacing of montmorillonite expands in a step-by-step manner,accompanied by volume expansion,decrease in density,and increase in self-diffusion coefficients of water molecules and cations.In addition,as the water molecular layer accumulates,the peak values of the radial distribution function between Na+/K+/Ca2+ions and Ow/Hw(oxygen or hydrogen atoms in water molecules)gradually decrease.The degree of polymerization of water intensifies before decreasing,while the elastic modulus and acoustic velocity are gradually decreasing.It is worth noting that Na+ion shows the highest tendency to hydrate,followed by Ca2+,and then K+.Among the cations studied,Ca2+ion has the highest hydration coordination number,hydration number and hydration radius.As a result,calcium montmorillonite exhibits the widest intensity range and the largest acoustic velocity.These findings can provide references for engineering practices such as oil and gas exploration,tunnel excavation,slope stabilization,and deep geological disposal. 展开更多
关键词 montmorillonite surface hydration molecular dynamics simulation radial distribution function self diffusion coefficient elasticity modulus
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Spatial vibration analysis of thin-walled box girders subject to moving random loads considering the shear effect 认领 引用 被引量：1
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作者 Yong Cai Laifu Zhang +1 位作者 Qiqi Feng Xiaoyong Lv 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期195-210,共16页
This research provides analytical solutions to assess the bending-torsional vibration behavior of a thin-walled box girder subjected to moving random loads.The governing equations of a thin-walled box girder have been... This research provides analytical solutions to assess the bending-torsional vibration behavior of a thin-walled box girder subjected to moving random loads.The governing equations of a thin-walled box girder have been formulated to incorporate the impact of shear effect.The technique of integral transformation and the method of statistical analysis are employed to determine the average and standard deviation of the displacements at mid-span.The research’s findings are compared with the results from the Newmark-βtechnique and the Monte Carlo method to validate the effectiveness of the proposed strategy.By analysing the parameters,it is confirmed that neglecting the shear effect can result in substantial underestimation of lateral displacement.Compared to the Euler-Bernoulli beam theory,which does not consider the shear effect,the proposed theory shows differences of up to 109%in the average value and 213%in the standard deviation.These analysis results provide a reference for the vibration analysis of thin-walled box girders. 展开更多
关键词 Analytical solutions Bending-torsional vibration Thin-walled box girder Moving random loads Shear effect
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Analytical solution for longitudinal responses of tunnels under combined effects of seismic waves and strike-slip faulting 认领 引用 被引量：1
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作者 Jie Tang Manchao He +2 位作者 Yafei Qiao Hanbing Bian Chun Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1266-1289,共24页
Strong seismic excitation and fault dislocation are likely to occur simultaneously in high-intensity seismic zones,causing severe damage to tunnels crossing active fault zones.This paper aims to develop a novel analyt... Strong seismic excitation and fault dislocation are likely to occur simultaneously in high-intensity seismic zones,causing severe damage to tunnels crossing active fault zones.This paper aims to develop a novel analytical solution to determine the longitudinal mechanical responses of tunnels subjected to the combined effects of seismic waves and strike-slip faulting.Adopting the elastic springbeam model,the seismic waves are modelled as shear horizontal(SH)waves and the fault dislocation follows an S-shaped pattern;the superposition principle for free-fielddisplacements caused by both effects is assumed.In addition,the transmission and reflectionof seismic waves at the fault-rock geological interface and the tangential contact conditions at the tunnel-rock interface are considered.The analytical model is validated against numerical simulations,confirmingits accuracy in calculating tunnel responses.Moreover,a parametric study is conducted to evaluate the impact of key factors,including fault displacement,fault zone width,fault dip angle,earthquake frequency,rock conditions,tunnel lining stiffness,and tangential contact conditions,on tunnel responses.Compared with each effect alone,the combined effects of seismic waves and strike-slip faulting significantlychange the tunnel deformation and internal forces,leading to increased tunnel responses,especially within the fault zone and near the fault-rock interfaces.Depending on specificparameters,tunnel responses can be classifiedinto seismic-dominated,faulting-dominated,and seismic-faulting coupled responses on the basis of the relative contributions of each effect.The proposed analytical solution can be applied to quickly predict the longitudinal mechanical behaviour of tunnels under such combined effects in engineering applications. 展开更多
关键词 Strike-slip faulting Longitudinal tunnel response Analytical solution Seismic waves Wave transmissions and reflections
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Contribution of ferroptosis and SLC7A11 to light-induced photoreceptor degeneration 认领 引用 被引量：2
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作者 Xiaoxu Huang Yumeng Zhang +9 位作者 Yuxin Jiang Tong Li Shiqi Yang Yimin Wang Bo Yu Minwen Zhou Guanran Zhang Xiaohuan Zhao Junran Sun Xiaodong Sun 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第1期406-416,共11页
Progressive photoreceptor cell death is one of the main pathological features of age-related macular degeneration and eventually leads to vision loss.Ferroptosis has been demonstrated to be associated with retinal deg... Progressive photoreceptor cell death is one of the main pathological features of age-related macular degeneration and eventually leads to vision loss.Ferroptosis has been demonstrated to be associated with retinal degenerative diseases.However,the molecular mechanisms underlying ferroptosis and photoreceptor cell death in age-related macular degeneration remain largely unexplored.Bioinformatics and biochemical analyses in this study revealed xC–,solute carrier family 7 member 11-regulated ferroptosis as the predominant pathological process of photoreceptor cell degeneration in a light-induced dry age-related macular degeneration mouse model.This process involves the nuclear factor-erythroid factor 2-related factor 2-solute carrier family 7 member 11-glutathione peroxidase 4 signaling pathway,through which cystine depletion,iron ion accumulation,and enhanced lipid peroxidation ultimately lead to photoreceptor cell death and subsequent visual function impairment.We demonstrated that solute carrier family 7 member 11 overexpression blocked this process by inhibiting oxidative stress in vitro and in vivo.Conversely,solute carrier family 7 member 11 knockdown or the solute carrier family 7 member 11 inhibitor sulfasalazine and ferroptosis-inducing agent erastin aggravated H2O2-induced ferroptosis of 661W cells.These findings indicate solute carrier family 7 member 11 may be a potential therapeutic target for patients with retinal degenerative diseases including age-related macular degeneration. 展开更多
关键词 age-related macular degeneration ferroptosis light exposure damage oxidative stress pathway photoreceptor programmed cell death solute carrier family 7 member 11(SLC7A11)
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基于TPE优化集成学习的岩石弹性模量预测模型 认领 引用 被引量：2
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作者 孟祥龙 王胜建 +5 位作者 朱迪斯 马彦彦 李大勇 迟焕鹏 张家政 岳伟民 《地质科技通报》 CAS CSCD 北大核心 2026年第1期342-350,共9页
油气工程中常利用地球物理资料获取地层弹性模量并结合小样本的岩心实验数据进行校正,但这种方法在复杂地质条件下往往表现不佳。为提高岩石弹性模量的预测精度和泛化能力,提出了一种利用基本岩石物性参数的弹性模量智能预测模型。分别... 油气工程中常利用地球物理资料获取地层弹性模量并结合小样本的岩心实验数据进行校正,但这种方法在复杂地质条件下往往表现不佳。为提高岩石弹性模量的预测精度和泛化能力,提出了一种利用基本岩石物性参数的弹性模量智能预测模型。分别采用3种集成学习算法(RandomForest,XGBoost,LightGBM)构建了岩石弹性模量智能预测模型,并采用TPE方法对模型进行超参数优化,最后利用SHAP归因分析探讨了各输入变量对模型的贡献。结果表明:①提出的智能预测模型明显优于传统模型,能够实现弹性模量的精确预测并具有较强的泛化能力,其中XGBoost模型表现最佳(决定系数R2=0.87,均方根误差RMSE=6.94,平均绝对误差MAE=4.96);②横波速度对模型贡献最大,纵波速度次之,密度最小,精确横波波速对弹性模量预测有重要意义。该方法无需对工区及地层进行预先识别即可实现弹性模量的精准预测,研究成果对油气工程设计及实施有重要参考意义。 展开更多
关键词 弹性模量 TPE 集成学习 SHAP 横波
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一种基于弹塑性理论的黄土湿陷评价模型 认领 引用 被引量：2
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作者 穆青翼 马鹏辉 +2 位作者 何芝远 黄强兵 彭建兵 《工程地质学报》 CSCD 北大核心 2026年第1期1-11,共11页
本文搜集文献中78组不同种类饱和/非饱和原状黄土(砂质、粉质和黏质)一维压缩数据,基于弹塑性理论建立湿陷系数计算模型,包括5个容易获取的参数:初始孔隙比、初始含水率、竖向应力、液限孔隙比和塑性指数。首先,选用孔隙比、含水率和竖... 本文搜集文献中78组不同种类饱和/非饱和原状黄土(砂质、粉质和黏质)一维压缩数据,基于弹塑性理论建立湿陷系数计算模型,包括5个容易获取的参数:初始孔隙比、初始含水率、竖向应力、液限孔隙比和塑性指数。首先,选用孔隙比、含水率和竖向应力变量,建立饱和/非饱和原状黄土压缩曲线方程。其次,通过液限孔隙比、塑性指数和初始孔隙比将不同种类原状黄土压缩曲线归一化。最后,基于所建立归一化的压缩曲线方程按照双线法计算湿陷系数。与文献中搜集的200组双线法和110组单线法试验结果对比,模型定性评价原状黄土湿陷程度的准确率在93%以上。从定量角度分析,在轻微、中等和强烈湿陷程度内,模型计算湿陷系数中90%以上数据的绝对误差分别在±0.01、±0.02和±0.05以内,上述精度满足工程中黄土湿陷性定量分析的要求。 展开更多
关键词 黄土 湿陷性 弹塑性理论 定性/定量评价
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The externally forced Boussinesq equation and its Wronskian and soliton-like solutions 认领 引用
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作者 Liyang Xu Xiaojun Yin +1 位作者 Na Cao Shuting Bai 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第1期30-36,共7页
This study investigates the dimensionless quasi-geostrophic potential vorticity(QG-PV)equation with external sources.Employing the Gardner-Morikawa transformation and weakly nonlinear perturbation expansion,we derive ... This study investigates the dimensionless quasi-geostrophic potential vorticity(QG-PV)equation with external sources.Employing the Gardner-Morikawa transformation and weakly nonlinear perturbation expansion,we derive the nonlinear Boussinesq equation with external sources.We demonstrate the existence of explicit zero-order and first-order Wronskian solutions for the model equation whenα4=0.Furthermore,using a modified Jacobi elliptic function method,we obtain soliton-like solutions for bothα4=0 andα4≠0.Analysis of these solutions reveals that the generalizedβ-plane approximation and shear flow are significant factors in inducing nonlinear Rossby waves,and that external sources play a crucial role in influencing Rossby wave behavior. 展开更多
关键词 rossby waves boussinesq equation Wronskian solutions soliton-like solutions
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Vision Sensing for Intelligent Driving:Technical Challenges and Innovative Solutions 认领 引用 被引量：1
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作者 Xinle Gong Zhihua Zhong 《Engineering》 SCIE EI CSCD 2026年第2期18-22,共5页
1.Introductio n With the rapid development of automotive intelligent technologies,in-vehicle vision sensors have gained traction as essential components of intelligent driving systems,providing critical road condition... 1.Introductio n With the rapid development of automotive intelligent technologies,in-vehicle vision sensors have gained traction as essential components of intelligent driving systems,providing critical road condition data,assisting driving decisions,and enabling autonomous driving functions.Compared with other in-vehicle perception sensors,vision sensors deliver more detailed and comprehensive environmental information,offering vital data to support intelligent driving decision-making and control[1].Therefore,the accuracy and reliability of visual perception directly influence the safety and performance of intelligent driving systems,making it a central factor in achieving truly intelligent and autonomous vehicles.Fig.1 illustrates the vision sensing in intelligent driving. 展开更多
关键词 innovative solutions vision sensing vision sensors intelligent driving systemsproviding vehicle vision sensors road condition autonomous driving intelligent driving
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A novel scaling method for the elastic ring supporting structure of an aero-engine rotor system: analytical and experimental investigations 认领 引用
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作者 Lei LI Tianyue MA +4 位作者 Zhong LUO Dongwu GAO Xiangdong GE Hui MA Shibin WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第1期1-18,共18页
The testing of large structures is limited by high costs and long cycles, making scaling methods an attractive solution. However, the scaling process of elastic rings introduces complexities in multi-parameter geometr... The testing of large structures is limited by high costs and long cycles, making scaling methods an attractive solution. However, the scaling process of elastic rings introduces complexities in multi-parameter geometric distortions, leading to a diminution in the predictive accuracy of the distorted similitude. To address this challenge, this study formulates a novel set of scaling laws, tailored to account for the intricate geometric distortions associated with elastic rings. The proposed scaling laws are formulated based on the intrinsic deformation characteristics of elastic rings, rather than the traditional systemic governing equations. Numerical and experimental cases are conducted to assess the efficacy and precision of the proposed scaling laws, and the obtained results are compared with those achieved by traditional methods. The outcomes demonstrate that the scaling laws put forth by this study significantly enhance the predictive capabilities for deformations of elastic rings. 展开更多
关键词 rotor system aero-engine elastic ring scaling method supporting structure
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A theoretical model to predict the elastic response of simply supported cylindrical shell under inner blast 认领 引用
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作者 Chuanqing Chen Hao Lu +3 位作者 Jiaqun Wang Guangfa Gao Xin Li Mingyang Wang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期274-300,共27页
This paper presents a theoretical model designed to predict the elastic response of simply supported cylindrical shells under internal explosion loads at arbitrary positions along the central axis.The model accounts f... This paper presents a theoretical model designed to predict the elastic response of simply supported cylindrical shells under internal explosion loads at arbitrary positions along the central axis.The model accounts for the propagation and attenuation effects of explosion waves over time and space.To accurately capture the varying impact area of the blast on the shell wall,the explosion wave function is divided into three distinct stages.By integrating classical shell theory and applying the Laplace transform solution method,the model provides an effective means of calculating the dynamic displacement response.The accuracy of the theoretical model is validated through finite element simulations across various cylinder radii.The strong agreement between theoretical and numerical results demonstrates the robustness of the model across a wide range of applications.This work provides a fundamental understanding of the dynamic behavior of cylindrical shells under internal blast loading,essential for enhancing safety and reliability in engineering applications. 展开更多
关键词 Cylindrical shell Internal blast loading Elastic response Theoretical model
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Deformation and stability of a circular-arc arch compressed by a rigid plate:incorporating tension,shear,and bending 认领 引用
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作者 Yunkai TANG Shengyi TANG +3 位作者 Kai LING Donghui LIU Huadong YONG Youhe ZHOU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第1期19-38,共20页
The contact deformation and buckling of elastic rods against rigid surfaces represent a prevalent phenomenon in applications such as oil drilling,arterial stents,and energy harvesting.This has attracted widespread att... The contact deformation and buckling of elastic rods against rigid surfaces represent a prevalent phenomenon in applications such as oil drilling,arterial stents,and energy harvesting.This has attracted widespread attention from researchers.In this paper,the deformation and buckling behaviors of a circular arch subject to compression by a rigid plate are investigated with a planar elastic rod model that incorporates tension,shearing,and bending.In comparison with the existing models that solely consider the bending energy,the deflection curve,the internal force distribution,and the critical load of the present model show good agreement with the finite element results.Through the dimensional analysis and order-of-magnitude estimation,we examine the factors influencing the critical load.The study reveals that the semi-central angle of the arch has the most significant effect.The dimensionless geometric parameter describing arch slenderness becomes prominent when the semi-central angle is less than 30°,while Poisson's ratio and the cross-sectional shear correction factor exhibit negligible influence.Furthermore,the variation in the proportions of strain energy components during critical buckling is presented with respect to the semi-central angle and the geometric parameter,thereby delineating the applicable ranges of both the original model(OM)and the modified model(MM). 展开更多
关键词 circular-arc arch elastic rod finite deformation buckling critical load
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高压电缆缓冲层烧蚀机理、检测技术与解决方案研究进展 认领 引用 被引量：11
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作者 武康宁 赵鸽 +4 位作者 李博达 葛洲 高建 任志刚 李建英 《高电压技术》 EI CAS CSCD 北大核心 2026年第2期789-800,共12页
皱纹铝护套结构的高压电缆近年来频繁发生缓冲层烧蚀故障,严重影响电缆的安全稳定运行。缓冲层烧蚀的机理、检测技术与解决方案在电力电缆领域得到了广泛关注。该文在阐述缓冲层结构及其功能的基础上,结合实际电缆的解体分析结果,从铝... 皱纹铝护套结构的高压电缆近年来频繁发生缓冲层烧蚀故障,严重影响电缆的安全稳定运行。缓冲层烧蚀的机理、检测技术与解决方案在电力电缆领域得到了广泛关注。该文在阐述缓冲层结构及其功能的基础上,结合实际电缆的解体分析结果,从铝护套、缓冲层、绝缘屏蔽层、主绝缘层的角度,系统总结了烧蚀故障的典型特征。梳理了干燥与潮湿环境下缓冲层烧蚀的发展机理:在干燥条件下,烧蚀故障主要由电缆受力不均匀引发的局部电流集中所致;在潮湿条件下,除上述机制外,电化学腐蚀反应生成的高阻性白色粉末进一步加剧了电流集中现象,焦耳热持续累积,最终引发电缆结构的损伤。基于烧蚀特征及机理,讨论了各类烧蚀缺陷检测技术的适用性,包括基于烧蚀过程中物理信号变化、电缆结构变化及烧蚀产物的检测方法。此外,该文讨论了缓冲层烧蚀故障的解决方案:对于存量电缆,在烧蚀未伤及绝缘屏蔽之前可采取修复技术修复故障缓冲层;对于增量电缆,建议严格控制缓冲层杂质离子成分及含量、保证绝缘屏蔽与铝护套之间良好的电气接触,或采用平滑铝护套结构替代现有皱纹铝护套结构,从根本上预防烧蚀故障的发生。 展开更多
关键词 高压电缆 缓冲层烧蚀 故障机理 故障检测 解决方案
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Theoretical analysis of rare earth-based halide double perovskites Cs2REAgCl6(RE=La,Lu):Unveiling physical properties 认领 引用
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作者 Norah Algethami Karrar Hazim Salem +8 位作者 Zahraa Falah Khudair Aqsa Allah Ditta Nasarullah Muhammad Usman Ghani Muhammad Faizan Mubashir Nazar Zainab Sadeq Yousif Shaymaa Adil Kudhair Manar A.Muninir 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第4期1213-1222,I0007,共10页
This work investigated the electronic transport and stability of rare earth metals-based halide perovskite materials Cs2LaAgCl6and Cs2LuAgCl6using the WIEN2k code by applying modified Becke-Johnson(mBJ)pot... This work investigated the electronic transport and stability of rare earth metals-based halide perovskite materials Cs2LaAgCl6and Cs2LuAgCl6using the WIEN2k code by applying modified Becke-Johnson(mBJ)potential.The stable nature for both perovskites was studied by tolerance,octahedral factors and formation enthalpy(ΔH).The corresponding negative formation enthalpies for Cs2LaAgCl6and Cs2LuAgCl6are-2.127 and-2.325 eV which confirm their stability.Both Cs2LaAgCl6and Cs2LuAgCl6exhibit semiconducting nature with a bandgap(Eg)of 3.71 eV(direct)for Cs2LaAgCl6and 3.46 eV(indirect)for Cs2LuAgCl6.Optical characteristics reveal the largest absorption in the UV region,suggesting both substances as viable for UV based photovoltaics uses.Thermoelectric(TE)features show that positive S values indicating p-type semiconductors and ZT>0.7,suggest their greater potential for use in TE gadgets. 展开更多
关键词 First-principles Elastic tensor Solar cell Optoelectronic Rare-earth metal Halide perovskite
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Enhanced CT-CBCT image registration for orthopedic surgery:Integrating rigid-elastic motion models 认领 引用
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作者 Zhiqi HUANG Deqiang XIAO +7 位作者 Hongxun LIU Long SHAO Danni AI Jingfan FAN Tianyu FU Yucong LIN Hong SONG Jian YANG 《虚拟现实与智能硬件（中英文）》 EI CSCD 2026年第1期87-100,共14页
Background Computed tomography(CT) and cone-beam computed tomography(CBCT) image registration play pivotal roles in computer-assisted navigation for orthopedic surgery. Traditional methods often apply uniform deformat... Background Computed tomography(CT) and cone-beam computed tomography(CBCT) image registration play pivotal roles in computer-assisted navigation for orthopedic surgery. Traditional methods often apply uniform deformation models, neglecting the biomechanical differences between rigid structures and soft tissues, which compromises registration accuracy, especially during significant bone displacements. Method To address this issue, we introduce RE-Reg, a rigid-elastic CT-CBCT image registration framework that jointly learns rigid bone motion and soft tissue deformation. RE-Reg incorporates a rigid alignment(RA) module to estimate global bone motion and an elastic deformation(ED) module to model soft tissue deformation, preserving bony structures through bone shape preservation(BSP) loss. Result Our comprehensive evaluation on publicly available datasets demonstrates that RE-Reg significantly outperforms existing methods in terms of registration accuracy and rigid bone structure preservation, achieving a 1.3% improvement in Dice similarity coefficient(DSC) and a 23% reduction in rigid bone deformation(%Δvol) compared with the best baseline. Conclusion This framework not only enhances anatomical fidelity but also ensures biomechanical plausibility and provides a valuable tool for image-guided orthopedic surgery. This code is available athttp://gffzz188fe103f8f1460as05kbkc5v9pcb6uqo.ffgz.tsg.suse.edu.cn/Zq-Huang/RE-Reg. 展开更多
关键词 Orthopedic surgery Image registration CT-CBCT Rigid motion Elastic deformation
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Human-Robot Interaction-Based Model Predictive Control for Exoskeleton Robots Driven by Series Elastic Actuators 认领 引用
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作者 Changxian Xu Keping Liu Zhongbo Sun 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第2期486-488,共3页
Dear Editor,This letter presents a model predictive control(MPC)scheme for human-robot interaction(HRI)in a multi-joint exoskeleton robot(ER)driven by series elastic actuator(SEA).The proposed scheme in robot-in-charg... Dear Editor,This letter presents a model predictive control(MPC)scheme for human-robot interaction(HRI)in a multi-joint exoskeleton robot(ER)driven by series elastic actuator(SEA).The proposed scheme in robot-in-charge(RIC)mode facilitates the ER driven by SEA to provide the required assistance and support for the subject. 展开更多
关键词 human robot interaction model predictive assistance support series elastic actuator model predictive control series elastic actuator sea exoskeleton robot robot charge mode
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季节性冻土区半填半挖梯形渠道衬砌冻胀力学模型 认领 引用
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作者 肖旻 王正中 +2 位作者 杨晓松 江浩源 葛建锐 《水利学报》 EI CSCD 北大核心 2026年第6期847-860,共14页
通过挖填平衡设计可显著优化渠道工程土方量,设置填土层使结构尽量远离地下水体能有效降低冻害风险,因此需要构建合理的半填半挖渠道冻胀分析模型。本文基于填土层-原土层双土层差异冻胀特性,结合弹性冻土地基梁理论和改进初参数法,建... 通过挖填平衡设计可显著优化渠道工程土方量,设置填土层使结构尽量远离地下水体能有效降低冻害风险,因此需要构建合理的半填半挖渠道冻胀分析模型。本文基于填土层-原土层双土层差异冻胀特性,结合弹性冻土地基梁理论和改进初参数法,建立了季节性冻土区半填半挖梯形衬砌渠道冻胀力学分析模型。引入端部边界条件和双土层交界面连续性条件获得衬砌板冻胀位移与截面内力解析表达式。结合工程实例,应用本文模型、单土层模型、有限元法对衬砌板进行冻胀力学分析。结果表明,本文模型计算的衬砌板冻胀位移在数值大小和变化趋势上均与实测结果符合良好。衬砌板冻胀位移与截面内力均呈现两段式差异分布特征,合理体现了“双土层”结构特性。本文模型计算的最大截面弯矩较单土层模型减小24.6%。基土自由冻胀量较小的区域对邻近区域衬砌板冻胀变形存在“阻滞效应”。结合上表面应力分析确定的危险区域范围与灌区实地调研结果基本一致。研究结果可为半填半挖渠道及有类似差异冻胀特性的冻土工程抗冻设计提供参考。 展开更多
关键词 冻土工程 渠道 冻胀 弹性地基梁 解析解
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Numerical investigation of the correlations of hydraulic and elastic characteristics in diverse carbonate rock types 认领 引用
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作者 Yutian Zhang Yifan Wu +5 位作者 Chi Zhang Fengqiao Wang Hucheng Deng Meiyan Fu Yonghui Li Qi Li 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期266-276,共11页
Carbonate reservoirs are vital energy storage spaces,including for oil,shale gas,geothermal,and hydrogen energy.Accurate prediction of reservoir characteristics such as permeability and saturated fluid types through n... Carbonate reservoirs are vital energy storage spaces,including for oil,shale gas,geothermal,and hydrogen energy.Accurate prediction of reservoir characteristics such as permeability and saturated fluid types through noninvasive approaches is crucial for optimal storage capability.In this paper,we combine a linear Boolean model and a discrete Fourier transform approach to generate pore‐and fracturepore‐type carbonate rocks.Elastic wave velocity information is necessary to predict permeability in different rock geometry models.Permeability is calculated using the lattice Boltzmann method,and the elastic wave velocity is calculated using a finite element method based on a minimal energy approach.Saturated fluids that contain oil and gas were both considered.Our simulated results reveal that,for pore‐type carbonate,empirical formulas were proposed to estimate permeability through elastic data.However,in fracture‐pore carbonate rocks,the precision of the empirical formula is compromised due to the presence of significant conductive channels within the rock matrix.We also find that using S‐wave velocity and permeability relationships to distinguish oil and gas is better than using P‐wave velocity and permeability relationships under low‐porosity conditions. 展开更多
关键词 carbonate rock elastic wave velocity oil and gas permeability
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Modal analysis on a fluid-conveying pipe subject to elastic supports with unknown-but-bounded parameters 认领 引用
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作者 Sha Wei Xulong Li +2 位作者 Xiong Yan Hu Ding Liqun Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期310-324,共15页
Uncertain parameters are widespread in engineering systems.This study investigates the modal analysis of a fluid-conveying pipe subjected to elastic supports with unknown-but-bound parameters.The governing equation fo... Uncertain parameters are widespread in engineering systems.This study investigates the modal analysis of a fluid-conveying pipe subjected to elastic supports with unknown-but-bound parameters.The governing equation for the elastically supported fluid-conveying pipe is transformed into ordinary differential equations using the Galerkin truncation method.The Chebyshev interval approach,integrated with the assumed mode method is then used to investigate the effects of uncertainties of support stiffness,fluid speed,and pipe length on the natural frequencies and mode shapes of the pipe.Additionally,both symmetrical and asymmetrical support stiffnesses are discussed.The accuracy and effectiveness of the Chebyshev interval approach are verified through comparison with the Monte Carlo method.The results reveal that,for the same deviation coefficient,uncertainties in symmetrical support stiffness have a greater impact on the first four natural frequencies than those of the asymmetrical one.There may be significant differences in the sensitivity of natural frequencies and mode shapes of the same order to uncertain parameters.Notably,mode shapes susceptible to uncertain parameters exhibit wider fluctuation intervals near the elastic supports,requiring more attention. 展开更多
关键词 Fluid-conveying pipe Elastic support Uncertainty Modal analysis Chebyshev interval method
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Texture weakening mediated by designed low-temperature rolling in a dilute magnesium alloy 认领 引用
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作者 Hong Ning Cheng Wang +3 位作者 Jian Wang Kai Guan Xinyu Xu Hui-Yuan Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第7期297-307,共11页
High-temperature rolling effectively weakens the texture of Mg sheets,but it leads to grain coarsening and high energy cost.This study introduces a low-temperature(100°C)rolling in dilute Mg-1Zn-1Sn-0.2Ca(ZTX110)... High-temperature rolling effectively weakens the texture of Mg sheets,but it leads to grain coarsening and high energy cost.This study introduces a low-temperature(100°C)rolling in dilute Mg-1Zn-1Sn-0.2Ca(ZTX110)alloy capable of achieving weakened texture.Zn/Sn/Ca additions promote the accumulation of high-energydislocations near high-density deformation twins and shear bands.This enhances the driving force for twinning and shear band-induced recrystallization in the subsequent annealing,thus substantially expanding randomlyoriented grains and weakening texture.During early annealing stage,initially segregated Zn atoms at twin boundaries migrate into the matrix mediated by residual dislocations,reducing solute drag and facilitating growth of randomly-oriented grains.Upon complete consumption of residual dislocations as recrystallization progresses,Zn atoms gradually re-segregate to grain boundaries of newly nucleated random grains,suppressing grain coarsening.These findings reveal a designed rolling regime enabling texture weakening of Mg sheets by activating profusedislocations and dynamic solute partitioning. 展开更多
关键词 Magnesium alloys Recrystallization Solute partitioning Texture weakening dislocations
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