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Layout design and application of 4D-printing bio-inspired structures with programmable actuators 认领 引用 被引量：5
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作者 Siyuan Zeng Yixiong Feng +2 位作者 Yicong Gao Hao Zheng Jianrong Tan 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2022年第1期189-200,共12页
Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over time.Actuators are used as a controlling factor with multi-stage shape rec... Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over time.Actuators are used as a controlling factor with multi-stage shape recovery,with emerging opportunities to customize the mechanical properties of bio-inspired structures.The print pattern of shape memory polymer(SMP)fbers strongly afects the achievable resolution,and consequently infuences several other physical and mechanical properties of fabricated actuators.However,the deformations of bio-inspired structures due to actuator layout are more complex because of the presence of the coupling of multi-directional strain.In this study,the initial structure was designed from closed-shell behavior and divided into a general unit and actuator unit,the latter responsible for driving the transformation.Mutual stress confrontation between the actuator and the general unit was considered in the layout thermodynamic model,in order to eliminate the transformation produced by the uncontrolled shape memory behavior of the general unit.Three critical and efective strategies for the layout design of actuators were proposed and then applied to achieve the desired accurate deformation of 3D-printed bilayer structures.Finally,the proposed approach was validated and adopted for fabricating a complex shell-like gripper structure. 展开更多
关键词 Bio-inspired structure Layout design Programmable actuators Bilayer structure 4D printing
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A Bio-inspired Low-frequency Vibration Isolator Based on Loofah Sponge Structure 认领 引用
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作者 Weijun Tian Xu Li +2 位作者 Xiaoli Wu Haoran Huang Linghua Kong 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第2期842-862,共21页
Inspired by the loofah sponge’s axially continuous porous core and peripheral hexagonal scaffold,we propose a compact bio-inspired low-frequency vibration isolator.An analytical static model reveals a Quasi-Zero-Stif... Inspired by the loofah sponge’s axially continuous porous core and peripheral hexagonal scaffold,we propose a compact bio-inspired low-frequency vibration isolator.An analytical static model reveals a Quasi-Zero-Stiffness(QZS)region produced by parallel coupling of an axial positive-stiffness spring and a nonlinear hexagonal link–spring unit.A Lagrangian dynamic model and ADAMS multibody simulations predict resonance and transmissibility and are validated by sinusoidal base-displacement tests.With a 5.775 kg payload,the prototype achieves effective isolation above~5 Hz and~25–30 dB attenuation at 20–22 Hz while retaining comparable load capacity to linear references of similar size.Compared with linear isolators,the designed bio-inspired low-frequency vibration isolator exhibits a lower isolation onset and a broader useful bandwidth under a compact footprint,offering tunable low-frequency isolation via geometric and stiffness parameters(α,k1,k3,l). 展开更多
关键词 Nonlinear dynamics Vibration isolation Bio-inspired structure Loofah sponge
Research progress on bio-inspired composite structures based on ceramic 3D printing:a review 认领 引用
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作者 Dekun Kong Hailong Wu +4 位作者 Qingquan Zhang Dechao Lyu Yumeng Han Zhihui Zhang Luquan Ren 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期430-468,共39页
Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibil... Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibility,but their inherent brittleness and processing defects urgently need to be broken through.Inspired by the biological structures found in nature,the integration of biomimicry and additive manufacturing(AM)technologies offers a new pathway for the innovative design of high-performance ceramic materials.This article systematically reviews the fundamental principles and classifications of ceramic AM technology,focusing on six typical elements of biomimetic structural design:coaxial composite structures,surface reinforcement structures,layered composite structures,porous structures,composite multicomponent structures,and intelligent bionic structures.The review delves into their biomimetic principles,preparation strategies,performance advantages,and research progress.Research indicates that through multiscale topological design and functional integration,these structures can significantly enhance the mechanical properties and environmental adaptability of ceramics.Nevertheless,current technologies still face numerous challenges in balancing manufacturing precision and efficiency,controlling cracks and residual stresses caused by interface defects,ensuring long-term material stability under extreme environments,enhancing intelligent response capabilities,and guaranteeing process scalability and performance consistency in clinical applications.Future research should integrate multidisciplinary approaches to optimize structural design and dynamic response,transforming biomimetic ceramic materials from‘biological replication'to‘performance exceeding',thereby providing theoretical and technical support for the customized development of high-performance ceramic devices. 展开更多
关键词 bio-inspired composite structures ceramic additive manufacturing coaxial composite structures composite multicomponent structures intelligent bionic structures
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Acoustic Absorption Properties of Bio-inspired Stochastic Voronoi Porous Structures 认领 引用
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作者 Wenjiong Chen Hanbin Wang +1 位作者 Zhiqi Li Shutian Liu 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1736-1750,共15页
Voronoi structures are widely present in nature,and highly ordered Voronoi structures such as honeycomb structures have gained extensive recognition and in-depth research in the field of sound absorption structure des... Voronoi structures are widely present in nature,and highly ordered Voronoi structures such as honeycomb structures have gained extensive recognition and in-depth research in the field of sound absorption structure design.However,Voronoi structures in biological tissues are not all highly ordered.Stochastic Voronoi structures are equally prevalent and exhibit excellent multifunctional properties.To further explore the acoustic value of stochastic Voronoi structures,this study proposes a Voronoi sound absorbing porous structure that features both structural stochasticity and performance robustness.First,a theoretical calculation model is established based on microperforated panel theory and Helmholtz resonance theory,enabling the rapid calculation of the structure’s sound absorption coefficient.Then,a systematic analysis is conducted on the effective conditions for absorption performance robustness from four dimensions:unit number,structural randomness,manufacturing errors,and boundary cutting.Results indicate that there exists a unit number threshold associated with absorption bandwidth in the Voronoi structure.When this threshold is exceeded,the structure can exhibit favorable sound absorption robustness against structural stochasticity,manufacturing errors,and boundary cutting.Experimental verification shows that under significant boundary changes,the structure still maintains an average sound absorption coefficient of approximately 0.8 within an absorption bandwidth of approximately 400 Hz.Its favorable low-frequency broadband sound absorption performance and robustness endow it with promising application prospects in engineering fields where cost control,environmental adaptability,and construction efficiency need to be balanced. 展开更多
关键词 Sound absorption structure Voronoi Structural stochasticity Performance robustness Porous structure
Dynamic characteristics and vibration isolation performance of an integrated kangaroo bio-inspired vibration suppression structure 认领 引用
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作者 Shihua Zhou Zichun Zhou +3 位作者 Xinhai Yu Chenhui Zhou Pengyang Wang Zhaohui Ren 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期276-291,共16页
Inspired that kangaroo can buffer the impact and absorb vibration from the ground and keep the whole-body stable,an integrated kangaroo bio-inspired vibration suppression(IKBVS)structure considering vibration isolatio... Inspired that kangaroo can buffer the impact and absorb vibration from the ground and keep the whole-body stable,an integrated kangaroo bio-inspired vibration suppression(IKBVS)structure considering vibration isolation-absorption simultaneously is proposed for low/wide band frequency vibration control.Based on skeleton mass,articulation friction,and the synergistic action among skeleton,articulation,and muscleendon,a vibration suppression model with more biological basic characteristics is derived.The validity of model and method is confirmed,and the static and dynamic analysis of the IKBVS system is carried out to investigate the vibration suppression performance.The quasi-zero stiffness region can be achieved with a smaller initial installation angle,medium rod length,smaller foot stiffness,and slightly lighter isolated mass in a wide displacement interval.The coupling mechanism of vibration isolation-absorption is revealed by parameter analysis.The results indicate that the IKBVS structure has favorite dynamic properties due to adjustable nonlinearity,namely,lower and adjustable resonance and anti-resonance frequency/peak and different levels of vibration suppression effect in high-frequency range are achieved readily.This research provides new insight into application of bio-inspired vibration suppression structures in various engineering systems for better vibration control. 展开更多
关键词 IKBVS structure Vibration isolation-absorption Vibration transmission Quasi-zero stiffness
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A Bio-inspired Interlocking Structure to Enhance Metal-Polymer Joint Strength by Additive Manufacturing and Injection Molding Processes 认领 引用
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作者 Heng Zhang Zeyan Li Xiaohong Ding 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1662-1679,共18页
The connection between metal and polymer is crucial for lightweight manufacturing in the electronics,automotive,aerospace industries and so on.Inspired by biological curves,this study proposes a novel biomimetic inter... The connection between metal and polymer is crucial for lightweight manufacturing in the electronics,automotive,aerospace industries and so on.Inspired by biological curves,this study proposes a novel biomimetic interlocking structure,designed specifically to enhance the metal-polymer joint strength.Through this approach,superior connection strength is achieved compared to conventional structures.Three different interlocking structures—Dragonfly Head-Neck interlocking structure,Kelvin interlocking structure,and the propopsed Curved Body-Centered Cubic Lattice interlocking structure—were additively manufactured with stainless steel,followed by injection molding to form the metal-polymer connection structures.The bonding performance of these structures was evaluated through finite element analysis and experiment.The results indicate that the Curved Body-Centered Cubic lattice interlocking structure with a 10%fill rate exhibited the highest bonding strength,outperforming both the Kelvin interlocking structure and the Dragonfly Head-Neck interlocking structure.Reducing the stiffness of the metal subatrate near the metal-polymer connection rigon can establish efficient load transfer path,which leads to a uniform stress distribution within the polymer,and allows the polymer to better withstand tensile forces during loading,finally achieve the goal of enhance the bonding strength of of the metal-polymer jointing.This research offers an innovative approach to enhancing mechanical connection interface strength,with significant implications for improving the durability and performance of metal-polymer composites. 展开更多
关键词 Additive manufacturing Biomimetic interlocking structure Metal-polymer jointing Injection molding Connection strength
Hydrodynamic Mechanisms,Fluid-Structure Interaction,and Material Selection in Underwater Bio-Inspired Robots:A Review 认领 引用
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作者 Hao Jiang Lucheng Sun +1 位作者 Liguo Shuai Zhihan Li 《Fluid Dynamics & Materials Processing》 EI 2026年第6期48-85,共38页
Underwater bio-inspired robots have emerged as a promising alternative to conventional propellerdriven autonomous underwater vehicles and remotely operated vehicles because of their potential for high propulsive effic... Underwater bio-inspired robots have emerged as a promising alternative to conventional propellerdriven autonomous underwater vehicles and remotely operated vehicles because of their potential for high propulsive efficiency,superior maneuverability,reduced acoustic signatures,and enhanced environmental adaptability.Unlike rigid propellers operating under approximately steady inflow conditions,bio-inspired propulsion relies on strongly unsteady hydrodynamic mechanisms,including vortex generation and shedding,added-mass effects,boundary-layer evolution,and flexible fluid-structure interaction(FSI).These processes fundamentally govern thrust production,energy conversion,and maneuvering performance,yet a systematic synthesis connecting hydrodynamic mechanisms with engineering implementation remains limited.This review addresses that gap from a hydrodynamic perspective.First,the major propulsion modes of aquatic organisms,including body and caudal fin(BCF),median and paired fin(MPF),and jet propulsion,are summarized together with their characteristic wake structures.Key unsteady flow mechanisms are then discussed,including reverse Kármán vortex streets,leading-edge vortex dynamics,dynamic stall,boundary-layer behavior,wake instabilities,and biomimetic drag-reduction strategies.Particular attention is given to flexible FSI,including modeling frameworks,passive deformation-active actuation coupling,stiffness and morphology effects,and energy-transfer pathways.Representative studies report propulsive efficiencies of approximately 50-70%for optimized flexible flapping foils and above 70%for phase-tuned dual-foil systems,while biomimetic surface designs have achieved approximately 5-10%drag reduction under specific flow conditions.However,these gains remain strongly condition-dependent,and their practical transfer is still limited by scale effects,propulsor interference,model uncertainty,material degradation,biofouling and insufficient marine validation.Future directions are proposed in real-environment hydrodynamics,multi-robot flow coordination,interdisciplinary modeling,and advanced materials.This review provides a mechanism-to-design framework for understanding,designing,and optimizing next-generation underwater bio-inspired robots. 展开更多
关键词 Bio-inspired underwater robots unsteady hydrodynamics fluid-structure interaction flexible propulsion biomimetic materials
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Durian-Shell-Inspired Biostructures for Energy Absorption and Impact Protection 认领 引用
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作者 Bin Xu Wenjun Bai 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1697-1718,共22页
This study presents a novel bionic thin-walled tube with a complex cross-section(BS),inspired by the protective thorns of the durian fruit,to enhance crashworthiness and impact protection.The spiky durian shell dissip... This study presents a novel bionic thin-walled tube with a complex cross-section(BS),inspired by the protective thorns of the durian fruit,to enhance crashworthiness and impact protection.The spiky durian shell dissipates impact energy and shields non-impact regions,motivating the biomimetic design.Quasi-static compression tests demonstrate that BS5 achieves a 9%higher Specific Energy Absorption(SEA)than Sinusoidal corrugated tubes(SIN)and 22%higher than Double Corrugated Tapered tubes(DT).The three BS configurations also exhibit 31-60%higher Crushing Force Efficiency(CFE)while reducing Undulation of Load-carrying Capacity(ULC)by 26-74%,resulting in smoother force-displacement responses.Bulkheads provide no advantage in axial energy absorption;in fact,BS5 without bulkhead achieves a 33%higher SEA.Structures with polygonal mid-sections show lower imperfection sensitivity than square ones,and when the side length-to-thickness ratio is preserved,larger-scale structures retain stable absorption efficiency,indicating potential for protective applications such as shelters.By integrating two antiprism units,BS5 delivers 45%higher SEA,71%higher CFE,and 35%lower ULC than a single antiprism tube.A calibrated linear elastic constitutive model accurately predicts crushing behavior under quasi-static loading.Unlike SIN and DT double-layer structures that collapse in thick-walled modes,deformation analysis reveals that double-layer BSs possess an optimal interlayer spacing to avoid such degeneration,exhibit a more complex plastic hinge evolution mechanism and higher energy absorption efficiency.Low-velocity drop-weight tests confirm superior impact resistance of BSs compared with SIN and DT,while high-velocity simulations reveal only a 21%increase in Initial Peak Crushing Force(IPCF)from 5 to 50 m/s,demonstrating robust dynamic performance.Overall,the durian-inspired BS tubes exhibit excellent crashworthiness and strong potential for advanced defense and engineering impact protection applications. 展开更多
关键词 Bio-inspired structures Double layered thin-walled tube Crashworthiness Impact protection Additive manufacturing
A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures 认领 引用 被引量：3
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作者 S.SAURABH R.KIRAN +2 位作者 D.SINGH R.VAISH V.S.CHAUHAN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第1期81-100,共20页
Bio-inspired helicoidal composite laminates,inspired by the intricate helical structures found in nature,present a promising frontier for enhancing the mechanical properties of structural designs.Hence,this study prov... Bio-inspired helicoidal composite laminates,inspired by the intricate helical structures found in nature,present a promising frontier for enhancing the mechanical properties of structural designs.Hence,this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates.The inverse hyperbolic shear deformation theory(IHSDT)of plates is employed to characterize the displacement field,with the incorporation of Green-Lagrange nonlinearity.The problem is modeled using the C0finite element method(FEM),and an in-house code is developed in the MATLAB environment to solve it numerically.Various helicoidal layup configurations including helicoidal recursive(HR),helicoidal exponential(HE),helicoidal semi-circular(HS),linear helicoidal(LH),and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied.The model is validated,and parametric studies are conducted.These studies investigate the effects of layup configurations,side-to-thickness ratio,modulus ratios,boundary conditions,and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates.The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors.Moreover,this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate. 展开更多
关键词 finite element method(FEM) nonlinear Green-Lagrange inverse hyperbolic shear deformation theory(IHSDT) bio-inspired composite plate helicoidal
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Multi-objective optimal design for flexible bio-inspired meta-structure with ultra-broadband microwave absorption and thin thickness 认领 引用 被引量：1
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作者 Mengfei FENG Shenyao LIU +5 位作者 Hui CHENG Kaifu ZHANG Yuan LI Guanjie YU Bo LIU Biao LIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第3期151-162,共12页
There is an urgent need for the application of broadband Microwave Absorption(MA)structures on the leading edges of aircraft wings,which requires the MA structures to possess both the broadband MA performance and grea... There is an urgent need for the application of broadband Microwave Absorption(MA)structures on the leading edges of aircraft wings,which requires the MA structures to possess both the broadband MA performance and great surface conformability.To meet these requirements,we designed and fabricated a flexible bioinspired meta-structure with ultra-broadband MA,thin thickness and excellent surface conformality.The carbonyl iron powder-carbon nanotubes-polydimethylsiloxane composite was synthesized by physical blending method for fabricating the MA meta-structure.Through geometry-electromagnetic optimal design by heuristic optimization algorithm,the meta-structure mimicking to the nipple photonic nanostructures on the eyes of moth can achieve ultra-broadband MA performance of 35.14 GHz MA bandwidth(reflection loss≤–10 dB),covering 4.86–40.00 GHz,with thickness of only 4.3 mm.Through simple fabrication processes,the meta-structure has been successfully fabricated and bonded on wings’leading edges,exhibiting excellent surface conformability.Furthermore,the designed flexible MA meta-structure possesses significant Radar Cross-Section(RCS)reduction capability,as demonstrated by the RCS analysis of an unmanned aerial vehicle.This flexible ultra-broadband MA meta-structure provides an outstanding candidate to meet the radar stealth requirement of variable curvature structures on aircraft. 展开更多
关键词 Broadband microwave absorption Surface conformability Flexible meta-structure Bio-inspired Electromagnetic Radar cross section
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Designing Load-Bearing Bio-Inspired Materials for Simultaneous Static Properties and Dynamic Damping:Multi-Objective Optimization for Micro-Structure 认领 引用
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作者 Bo Dong Yunfei Jia Wei Wang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第2期247-261,共15页
Biological load-bearing materials,like the nacre in shells,have a unique staggered structure that supports their superior mechanical properties.Engineers have been encouraged to imitate it to create load-bearing bio-i... Biological load-bearing materials,like the nacre in shells,have a unique staggered structure that supports their superior mechanical properties.Engineers have been encouraged to imitate it to create load-bearing bio-inspired materials which have excellent properties not present in conventional composites.To create such materials with desirable mechanical properties,the optimum structural parameters combination must be selected.Moreover,the optimal design of bio-inspired composites needs to take into account the trade-offs between various mechanical properties.In this paper,multi-objective optimization models were developed using structural parameters as design variables and mechanical properties as optimization objectives,including stiffness,strength,toughness,and dynamic damping.Using the NSGA-II optimization algorithm,a set of optimal solutions were solved.Additionally,three different structures in natural nacre were introduced in order to utilize the better structure when design bio-inspired materials.The range of optimal solutions that obtained using results from previous research were examined and explained why this collection of optimal solution ranges is better.Also,optimal solutions were compared with the structural features and mechanical properties of real nacre and artificial biomimetic composites to validate our models.Finally,the optimum design strategies can be obtained for nacre-like composites.Our research methodically proposes an optimization method for achieving load-bearing bio-inspired materials with excellent properties and creates a set of optimal solutions from which designers can select the one that best suits their preferences,allowing the fabricated materials to demonstrate preferred performance. 展开更多
关键词 Load-bearing bio-inspired composites Staggered structure Multi-objective optimization
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Bio-inspired magnetic soft robots with omnidirectional climbing for multifunctional biomedical applications 认领 引用 被引量：1
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作者 Ruomeng Xu Xianli Wang +2 位作者 Yuanhe Chen Lap Mou Tam Qingsong Xu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期685-695,共11页
In recent years,the rising incidence of gastrointestinal(GI)cancer has triggered an urgent need for effective early intervention strategies.Traditional endoscopic techniques often cause patient discomfort,and it is di... In recent years,the rising incidence of gastrointestinal(GI)cancer has triggered an urgent need for effective early intervention strategies.Traditional endoscopic techniques often cause patient discomfort,and it is difficult to navigate deep regions of complex organ structures.This work proposes a kind of bio-inspired magnetic soft robot(BMSR)to address these challenges.The design of the BMSRs is inspired by the rolling motion of the golden wheel spider.Two six-degree-of-freedom(6-DOF)robotic arms are used,where one arm is responsible for real-time manipulation of the BMSRs,and the other is dedicated to monitoring their status.Under the actuation of an external rotating magnetic field,the BMSRs can flexibly climb on inclined surfaces at any angle,involving the inverted surface.Through the powerful output force,the BMSRs can overcome the mobility barrier induced by different human organs,including mucus,folds,and height differences of up to 8 cm.Such an exceptional mobility enables the BMSRs to deliver drugs in the targeted complex GI environment.Moreover,in combination with an endoscope,it provides real-time visual feedback for precise navigation.In vitro animal experiments validate the feasibility of BMSRs,paving a way for their usage in minimally invasive GI treatment.This work advances the potential applications of magnetic soft robots in the biomedical field. 展开更多
关键词 magnetic millirobots magnetic actuation medical robotics soft robots bio-inspired robots
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A novel Angle-Constrained Optimization method of Conformal Lattice Structures 认领 引用 被引量：1
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作者 Jun Yan Weibin Xu +2 位作者 Fuhao Wang Sixu Huo Kun Yan 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第2期269-295,共27页
Conformal truss-like lattice structures face significant manufacturability challenges in additive manufac-turing due to overhang angle limitations.To address this problem,we propose a novel angle-constrained optimizat... Conformal truss-like lattice structures face significant manufacturability challenges in additive manufac-turing due to overhang angle limitations.To address this problem,we propose a novel angle-constrained optimization method grounded in the global adjustment of nodal coordinates.First,a build direction is selected to minimize the number of violating struts.Then,an angular-constraint matrix is assembled from strut direction vectors,and analytical sensitivities with respect to nodal coordinates are derived to enable efficient constrained optimization under nonlinear angular inequality constraints.Numerical studies on two complex curved-surface lattices demonstrate that all overhang violations are eliminated while only minor changes are induced in global stiffness and strength.In particular,the maximum displacement of an ergonomic insole varies by only 2.87%after optimization.The results confirm the method’s versatility and engineering robustness,providing a practical approach for additive manufacturing-oriented lattice structure design. 展开更多
关键词 Conformal lattice structures additive manufacturing structural optimization complex structures
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Inverse design framework of hybrid honeycomb structure with high impact resistance based on active learning 认领 引用 被引量：2
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作者 Xingyu Shen Ke Yan +5 位作者 Difeng Zhu Hao Wu Shijun Luo Shaobo Qi Mengqi Yuan Xinming Qian 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期407-421,共15页
In this study,an inverse design framework was established to find lightweight honeycomb structures(HCSs)with high impact resistance.The hybrid HCS,composed of re-entrant(RE)and elliptical annular re-entrant(EARE)honey... In this study,an inverse design framework was established to find lightweight honeycomb structures(HCSs)with high impact resistance.The hybrid HCS,composed of re-entrant(RE)and elliptical annular re-entrant(EARE)honeycomb cells,was created by constructing arrangement matrices to achieve structural lightweight.The machine learning(ML)framework consisted of a neural network(NN)forward regression model for predicting impact resistance and a multi-objective optimization algorithm for generating high-performance designs.The surrogate of the local design space was initially realized by establishing the NN in the small sample dataset,and the active learning strategy was used to continuously extended the local optimal design until the model converged in the global space.The results indicated that the active learning strategy significantly improved the inference capability of the NN model in unknown design domains.By guiding the iteration direction of the optimization algorithm,lightweight designs with high impact resistance were identified.The energy absorption capacity of the optimal design reached 94.98%of the EARE honeycomb,while the initial peak stress and mass decreased by 28.85%and 19.91%,respectively.Furthermore,Shapley Additive Explanations(SHAP)for global explanation of the NN indicated a strong correlation between the arrangement mode of HCS and its impact resistance.By reducing the stiffness of the cells at the top boundary of the structure,the initial impact damage sustained by the structure can be significantly improved.Overall,this study proposed a general lightweight design method for array structures under impact loads,which is beneficial for the widespread application of honeycomb-based protective structures. 展开更多
关键词 Re-entrant honeycomb Hybrid structures Inverse design Impact resistance Lightweight
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Response of wind turbine loads to multi-scale turbulent structures:a study based on turbulence signals observed in the field 认领 引用 被引量：2
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作者 Yongfen Chai Yan Wang +2 位作者 Haolin Li Jingjing Zhang Jian Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期593-609,共17页
Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in Chi... Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in China,the aerodynamic load responses of the wind turbine to different turbulence scales are quantitatively analyzed in this study.The results indicate that very large-scale motions(VLSMs)are associated with significant load fluctuations due to its low frequency and high energy characteristics,increasing the risk of extreme loads.Large-scale motions coupled with the natural frequency of wind turbines in the medium frequency range,result in resonance phenomena.Small-scale motions,due to their high-frequency rapid vibration characteristics,cause instantaneous oscillations in wind turbine loads.Furthermore,correlation analysis indicates that the flapwise moment and thrust are most sensitive to VLSMs,while the edgewise moment is less affected by the scale characteristics.It is worth noting that this study is the first to explore the modulation effects of different scales of turbulent structures on the amplitude of wind turbine load fluctuation.It was found that turbulent structures exceeding a scale of 3δ have the most significant impact on modulating the load amplitudes,where δ is the boundary layer thickness,which is 99% of the flow velocity outside the boundary layer.These findings contribute to the enhancement of understanding regarding the load response of wind turbines in multi-scale turbulent environments and provide important references for the optimization of wind turbine design and load control. 展开更多
关键词 Multi-scale turbulent structures Wind turbine load response Field observation experiment Wavelet analyze
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Genetic structure and admixture of the Yi and Qiang in southwestern China 认领 引用 被引量：1
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作者 Jun LIU Li JIANG +6 位作者 Yongqiang KONG Chunnian WANG Shuo FENG Xuanzhu CHEN Deqin ZHANG Chuanchao WANG Caixia LI 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS CSCD 2026年第4期402-415,共14页
The Tibetan-Yi Corridor in southwestern China is well-known for the origins,migration,and evolution of Sino-Tibetan populations.Previous genetic studies have primarily focused on Han and Tibetan populations,thereby le... The Tibetan-Yi Corridor in southwestern China is well-known for the origins,migration,and evolution of Sino-Tibetan populations.Previous genetic studies have primarily focused on Han and Tibetan populations,thereby leaving the significant genetic diversity within the Tibeto-Burman groups under-researched.In this study,to explore the genetic structure and admixture history of Tibeto-Burman populations in southwestern China,we sequenced the human genomes of 100 individuals from the Qiang and Yi ethnic groups in Sichuan Province.These populations were found to have the closest genetic affinity with nearby Tibeto-Burman-speaking Tujia and Tibetan populations.The Qiang share more allele sites with northern Altaic-speaking populations,while the Yi have closer genetic relationships with southern Hmong-Mien populations.The dominant ancestry of the Yi and Qiang derived from Neolithic millet agriculturalists in the Yellow River Basin,with a smaller proportion from Neolithic coastal populations in southern China,supporting the hypothesis of a northern origin of Sino-Tibetan populations.The Yi have more southern genetic components than the Qiang,reflecting the differential genetic influences of southeastern coastal populations on these groups.In summary,this study elucidates the fine-scale genetic structure of Tibeto-Burman populations and their genetic relationships with other Chinese populations,laying the foundation for forensic genetic research in East Asian populations. 展开更多
关键词 Tibeto-Burman Genetic diversity Genetic structure Population genetic relationships
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Impact of wall oscillation on the drag and flow structure in an open channel at transitional Reynolds number 认领 引用 被引量：1
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作者 Bofu Wang Luyao Zhang +1 位作者 Jianghua Li Quan Zhou 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期187-198,共12页
This study investigates the effects of spanwise wall oscillations(SWOs)on open channel flow at Reτ=85 using direct numerical simulations.The oscillation amplitude is fixed at A+=12,and the period T+varies from ... This study investigates the effects of spanwise wall oscillations(SWOs)on open channel flow at Reτ=85 using direct numerical simulations.The oscillation amplitude is fixed at A+=12,and the period T+varies from 20 to 400.Results show that SWOs reduce drag,with the highest reduction of 31%at T+=70.The primary mechanisms include an elevated streamwise velocity profile,reduced Reynolds stress,and disruption of near-wall coherent structures.A novel vortex cluster structure emerges,weakening near-wall streaks and reducing skin friction drag.As T+increases,the spanwise tilt of near-wall streaks becomes more pronounced,and turbulence recovers,leading to drag values closer to the uncontrolled flow.Beyond T+=70,the modulation effect on turbulence fluctuations saturates.SWOs mainly regulate Reynolds shear stress by controlling Q4 events,with shorter periods suppressing large-scale structures and longer periods enhancing velocity fluctuations. 展开更多
关键词 Transitional Reynolds number Drag reduction Turbulent structures
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The interface engineering strategy assists the 3D core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres to achieve significant overall water splitting 认领 引用 被引量：3
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作者 Jun Yu Yangping Zhang +6 位作者 Nannan Zhang Jie Li Huiyu Sun Xinyu Gu Changqing Ye Tianpeng Liu Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期570-576,共7页
Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral ... Designing a highly active and stable bifunctional catalyst is essential for achieving superior overall water splitting(OWS).In this study,a three-dimensional(3D)core-shell structure Co3S4/CuS@NiFe LDH nanocoral spheres electrocatalyst was constructed on nickel foam(NF)via an interfacial engineering strategy.This 3D core-shell heterostructure maximizes the exposure of active sites,optimizes the charge transport pathway and accelerates gas release rates.The protective shell strategy of NiFe LDH provides favorable stability,which contributes to inhibiting the electrochemical corrosion of the electrocatalyst and mitigating the toxic effects of Cl- and other microorganisms during the seawater splitting process.Moreover,the introduction of NiFe LDH induces a change in the OER mechanism from an adsorption evolution mechanism(AEM)to a lattice oxygen mechanism(LOM),which improves the intrinsic activity of the catalyst.Consequently,Co3S4/CuS@NiFe LDH demonstrates exceptional performance in the oxygen evolution reaction(OER)(η100=251 mV)and in the hydrogen evolution reaction(HER)(η100=254 mV),alongside remarkable stability over 100 h.For OWS,it exhibits a voltage of 1.46 V at 10 mA/cm2 and maintain stability for 100 h.Impressively,Co3S4/CuS@NiFe LDH still possesses outstanding activity and stability in natural alkaline seawater.This work proposes interfacial engineering to construct bifunctional catalysts with core-shell heterostructures,providing instructive guidelines for the design of highly efficient electrocatalysts toward seawater electrolysis. 展开更多
关键词 Core-shell structure Layered double hydroxides Transition metal sulphides Bifunctional catalyst Overall water splitting Overall seawater splitting
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Optimal management for promoting growth of poplar plantations:insights from canopy structure and light environment 认领 引用 被引量：1
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作者 Xiaolong Zhao Peilin Xie +3 位作者 Yutian Xin Junfeng Fan Pan Wan Huijing Ma 《Journal of Forestry Research》 SCIE EI CAS CSCD 2026年第1期60-77,共18页
Tree plantations are globally significant,and therefore,growth-related challenges cannot be ignored.Canopy structure and light environment influence the growth of plantations,but the precise relationship remains uncle... Tree plantations are globally significant,and therefore,growth-related challenges cannot be ignored.Canopy structure and light environment influence the growth of plantations,but the precise relationship remains unclear.We selected seven-year-old poplar plantations of varying cultivars planted various densities and measured their growth,canopy structure,and light environment.The findings indicate that poplar plantations of different cultivars and at different planting densities showed variations in leaf area index(LAI),average leaf angle(ALA),crown length(CL),length ratio(CLR),roundness(CR)and surface area(CSA),which directly or indirectly affect growth,resulting in disparities in their growing conditions.Crown roundness directly impacted growth,while LAI,CLR and ALA influenced growth indirectly by affecting intercellular carbon dioxide concentration.LAI and CLR had a positive effect;ALA had a negative one.Crown length and surface area directly and indirectly influenced growth by affecting photo synthetically active radiation and net photo synthetic rate,with direct impacts being more pronounced.This research has clarified the regulatory role of canopy structure in plantations growth,providing valuable insights for developing more effective management strategies. 展开更多
关键词 Poplar growth Photosynthesis Hybrid clones Structural equation modelling Crown surface area
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Influence mechanism of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation of igneous metamorphic coal 认领 引用 被引量：1
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作者 Xu Shao Botao Qin +5 位作者 Quanlin Shi Ziwei Li Bao Qu Shibo Xu Junyu Wang Mingyue Weng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期553-572,共20页
In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study invest... In igneous-intruded coal seams,coal undergoes significant metamorphism,which critically alters its pore structure and oxygen consumption dynamics,thereby elevating its spontaneous combustion tendency.This study investigates the specific surface area,pore volume,structure complexity/connectivity,heterogeneity/local features of pore size distribution,and oxygen consumption dynamics of igneous metamorphic coal through N2/CO2 isothermal adsorption tests and low-temperature oxidation experiments,and elucidates the influence mechanisms of pore structure evolution on oxygen consumption dynamics during low-temperature oxidation.With increasing metamorphic degree,igneous metamorphic coal exhibits a more pronounced reduction in specific surface area during oxidation,while the increase in structure complexity due to coal-oxygen reactions is suppressed.Thermally metamorphic coal demonstrates accelerated oxygen consumption,with oxidation amplifying the difference in reaction rates compared to raw coal.Key mechanisms include oxidation-induced reduction in mesopore complexity and micropore volume,decreased dominance of small-pore-volume apertures,and increased heterogeneity,collectively leading to a lower half-oxygen-consuming temperature and steeper oxygen consumption curves.Simultaneously,increased pore volume/complexity and reduced uniformity/connectivity act synergistically to enhance oxygen consumption capacity,highlighting the coupling between pore structure evolution and oxidation behavior in igneous metamorphic coal.This study provides theoretical insights into the pore-oxygen coupling mechanisms governing coal spontaneous combustion in igneous intrusion areas. 展开更多
关键词 Igneous metamorphic coal Thermal metamorphism Low-temperature oxidation Pore structure Oxygen consumption dynamics
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