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Nonlinear Spin-Orbit Interaction of Light in a Cold Rydberg Atom Medium 认领 引用
1
作者 Lu Qin Chao Hang +1 位作者 Weibin Li Xingdong Zhao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期49-60,共12页
We demonstrate that a nonlinear spin-orbit interaction(SOI)emerges in cold Rydberg atomic gases,where the orbital characteristics(spatial structure)of light fields become coupled to their polarization(spin).This SOI o... We demonstrate that a nonlinear spin-orbit interaction(SOI)emerges in cold Rydberg atomic gases,where the orbital characteristics(spatial structure)of light fields become coupled to their polarization(spin).This SOI originates from the giant,spatially inhomogeneous nonlinear optical response arising from the strong,long-range interactions between Rydberg atoms.By extending the theoretical framework beyond the conventional paraxial approximation,we derive a light propagation equation that rigorously incorporates such inhomogeneous nonlinearity.Our study reveals that the SOI is driven by the gradient of the inhomogeneous nonlinear response and therefore vanishes in linear or homogeneous media.When two orthogonal light fields co-propagate,the SOI generates novel nonlinear energy transfer and pronounced structural deformation,which are not captured without considering the SOI or within the paraxial approximation.Furthermore,owing to its direct dependence on the gradient of the nonlocal nonlinearity,the SOI is inherently mode-dependent.As a consequence,the structural deformation becomes particularly significant for light fields with odd parity symmetry.Our investigation establishes novel pathways for exploring the nonlinear SOI and examining inhomogeneous nonlinear optical responses beyond the paraxial approximation in cold Rydberg atomic gases. 展开更多
关键词 nonlinear spin orbit interaction cold Rydberg atoms light propagation equation nonlinear optical response extending theoretical framework light fields rydberg atomic gaseswhere inhomogeneous nonlinear optical response
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Random Search Deep Neural Networks Driven Koopman Subspace Modeling of Nonlinear Dynamics 认领 引用
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作者 Zixiang Yuan Jie Ding +1 位作者 Dezhi Shen Min Xiao 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第7期1770-1772,共3页
Dear Editor,Nonlinear dynamic system is difficult to model by traditional modeling methods,because of high nonlinearity and limited precision.Koopman operator,an effective technique,maps nonlinear dynamic systems to a... Dear Editor,Nonlinear dynamic system is difficult to model by traditional modeling methods,because of high nonlinearity and limited precision.Koopman operator,an effective technique,maps nonlinear dynamic systems to a higher-dimensional linear space,allowing complex nonlinear behavior to be described linearly.However,conventional Koopman-based approaches often suffer from computational complexity,this paper employs a deep neural network with random search to learn feature mappings and estimates the Koopman operator by subspace identification.Experimental results show the approach simplifies modeling and significantly improves modeling accuracy over traditional methods. 展开更多
关键词 feature mappings nonlinear dynamic systems dynamic system complex nonlinear behavior nonlinear dynamics deep neural network random search modeling methodsbecause
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Transient responses of a nonlinear main structure coupled with two-degree-of-freedom nonlinear energy sink and piezoelectric energy harvester 认领 引用
3
作者 Xiaochun Nie Xiqi Lin +2 位作者 Ziheng Wang Zhitao Yan Lingzhi Wang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期119-137,共19页
Nonlinear energy sink(NES)coupled piezoelectric devices offer dual efficacy of vibration suppression and vibration energy harvesting.This work proposes a novel two-degree-of-freedom NES-piezoelectric system that combi... Nonlinear energy sink(NES)coupled piezoelectric devices offer dual efficacy of vibration suppression and vibration energy harvesting.This work proposes a novel two-degree-of-freedom NES-piezoelectric system that combines linear and nonlinear damping of NES(2-DOF CPNES),and focuses on the transient responses of the system of nonlinear main structure coupled with 2-DOF CPNES.The theoretical model of the system is developed,and the slowly varying dynamic flow equations for both conservative and non-conservative systems are derived using the complexification-averaging method.The nonlinear normal modes of the conservative system are then analyzed.The vibration suppression efficiency and energy transfer mechanisms of the system are examined under various external excitation intensities,and compared with those of the NES-piezoelectric system with purely linear damping(2-DOF LPNES)and purely nonlinear cubic damping(2-DOF NPNES).Additionally,the influence of circuit parameters on performance is further explored.The 1:1 transient resonance capture phenomena occur between the main structure and the first-level NES oscillator,as well as between the first-level and second-level NES oscillators,revealing the occurrence of transient 1:1:1 resonance capture phenomena among the three oscillators.The 2-DOF CPNES system combines the advantages of both the 2-DOF LPNES and 2-DOF NPNES systems,featuring a lower energy triggering threshold and maintaining high performance under larger transient excitation intensities.Although the circuit parameters have minimal impact on vibration suppression performance,they significantly affect energy harvesting efficiency.Furthermore,this study elucidates the vibration suppression and energy harvesting mechanisms of the 2-DOF NES-piezoelectric system from the perspective of dual nonlinearities in stiffness and damping.The findings demonstrate that the incorporation of nonlinear damping effectively enhances system robustness and improves vibration suppression performance under high-intensity transient excitations. 展开更多
关键词 Nonlinear energy sink Energy harvester Vibration suppression Nonlinear vibration Complexification-averaging method
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Adaptive compensation of nonlinear distortion in high-speed free-space optical systems 认领 引用
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作者 Weijie WU Yatao YANG 《Optoelectronics Letters》 EI 2026年第6期360-365,共6页
Nonlinear distortions from atmospheric turbulence and scattering critically degrade free-space optical(FSO)communication performance.We propose a hybrid Vol_LSTM framework combining the Volterra model's nonlinear ... Nonlinear distortions from atmospheric turbulence and scattering critically degrade free-space optical(FSO)communication performance.We propose a hybrid Vol_LSTM framework combining the Volterra model's nonlinear characterization with long short-term memory(LSTM)temporal dynamic modeling.This synergistic approach adaptively compensates atmospheric-induced distortions through parallel processing of instantaneous nonlinear effects and time-varying channel dynamics.Simulations and experiments demonstrate a 32 d B power budget with 31.53%performance improvement and 21%computational complexity reduction compared to conventional methods,alongside enhanced disturbance resilience.The framework's dual mechanism of model-based Volterra filtering and data-driven LSTM adaptation provides a practical solution for atmospheric-challenged FSO systems,advancing robust optical communication design. 展开更多
关键词 d b synergistic approach nonlinear distortion parallel processing adaptive compensation instantaneous nonlinear effects atmospheric turbulence volterra models nonlinear characterization
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Terabit nonlinear frequency division multiplexing transmission desensitized to laser frequency offset and phase noise 认领 引用
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作者 Xiang Cai Xiansong Fang +4 位作者 Jiayu Zheng Yixiao Zhu Xinyu Chen Xian Zhou Fan Zhang 《Advanced Photonics Nexus》 CSCD 2026年第2期90-99,共10页
Nonlinear frequency division multiplexing(NFDM)utilizes the nonlinear Fourier transform(NFT)to decompose signals into the nonlinear frequency domain that inherently resists fiber Kerr nonlinearity distortions.However,... Nonlinear frequency division multiplexing(NFDM)utilizes the nonlinear Fourier transform(NFT)to decompose signals into the nonlinear frequency domain that inherently resists fiber Kerr nonlinearity distortions.However,practical NFDM has been hindered by sensitivity to laser frequency offset and phase noise.In conventional NFDM receivers,a residual frequency offset typically remains before the NFT,whereas phase recovery performed after the NFT can only estimate the average phase rotation per burst,fundamentally limiting tolerance to frequency-phase impairments.In this work,we propose and experimentally demonstrate a residual carrier scheme to compensate for frequency offset and phase noise before the receiver NFT with sampling-point-level precision.Using a 3 MHz distributed feedback(DFB)laser,this scheme enables 1.0 Tb∕s PS-256 QAM NFDM transmission over 320 km,with a high spectral efficiency of 9.85 b∕s∕Hz.The Q2-factor degradation is only 0.85 dB as the total linewidth increases from 200 Hz to 3.1 MHz.The scheme achieves a Q2-factor improvement of 2.6 dB with 100 k Hz external cavity lasers and>6 dB with a 3 MHz DFB laser,compared with the conventional time-domain pilot method.To our knowledge,this is the first time NFDM demonstrates comparable tolerance to frequency-phase impairments as single-carrier systems.The proposed scheme desensitizes NFDM to frequency-phase impairments,overcoming a major barrier to practical deployment. 展开更多
关键词 nonlinear frequency division multiplexing nonlinear Fourier transform frequency offset phase noise residual carrier
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Nonlinear model predictive control strategy for vehicle path tracking with steering actuator’s dynamic characteristics 认领 引用
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作者 Bin Wang Zhiguo Zhao +1 位作者 Xiwen Yuan Yuyi Wang 《Control Theory and Technology》 EI CSCD 2026年第3期359-373,共15页
The dynamic characteristics of the steering actuator,including response time-delay and calibration deviation,are crucial to a vehicle’s path tracking performance.This study proposes a novel vehicle path tracking cont... The dynamic characteristics of the steering actuator,including response time-delay and calibration deviation,are crucial to a vehicle’s path tracking performance.This study proposes a novel vehicle path tracking control strategy by combining nonlinear model predictive control(NMPC),time-delay model control,and calibration deviation compensation control.In the first stage,the path tracking NMPC strategy is designed without considering the steering actuator’s dynamic characteristics.In the second stage,by combining polynomial fitting with linear matrix inequality(LMI)techniques,a nonlinear time-delay model control algorithm is designed to address the response time-delay.In the third stage,based on the inverse model of the calibration deviation,a nonlinear compensation algorithm is designed for steering actuator’s calibration deviation.Finally,simulation and real vehicle experiment results are provided to illustrate the effectiveness of the proposed vehicle path tracking control strategy. 展开更多
关键词 Nonlinear model predictive control(NMPC) Path tracking Nonlinear time-delay model control Calibration deviation compensation control
NONLINEAR SINGULAR EIGENVALUE PROBLEMS 认领 引用
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作者 Nikolaos S.PAPAGEORGIOU Zijia PENG 《Acta Mathematica Scientia》 SCIE CSCD 2026年第3期1484-1499,共16页
We study a nonlinear eigenvalue problem driven by a general nonhomogeneous differential operator,involving a reaction term that is singular at x=0 and becomes superlinear as x→+∞.Unlike the usual case in the literat... We study a nonlinear eigenvalue problem driven by a general nonhomogeneous differential operator,involving a reaction term that is singular at x=0 and becomes superlinear as x→+∞.Unlike the usual case in the literature,the singular term and the perturbation are not decoupled.By using variational methods in combination with truncation and comparison techniques,we establish a global existence and multiplicity theorem with respect to the parameter(eigenvalue)λ>0.Additionally,we demonstrate the existence of a minimal positive solution uλ*and investigate the continuity and monotonicity properties of the mapλ→uλ*. 展开更多
关键词 singular and superlinear reaction nonlinear regularity nonlinear maximum principle truncations and comparisons minimal positive solutions
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Pulse-train propagation in a nonlinear Kerr medium governed by higher-order dispersion 认领 引用
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作者 Houria Triki Vladimir I Kruglov 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第5期196-206,共11页
We discover three novel classes of pulse-trains in an optical Kerr nonlinear medium possessing all orders of dispersion up to the fourth order.We show that both single-and double-humped pulse-trains can be formed in t... We discover three novel classes of pulse-trains in an optical Kerr nonlinear medium possessing all orders of dispersion up to the fourth order.We show that both single-and double-humped pulse-trains can be formed in the nonlinear medium.A distinguishing property is that these structures have different amplitudes,widths and wave numbers but equal velocity which depends on the three dispersion parameters.More importantly,we find that the relation between the amplitude and duration of all the newly obtained pulse-trains is determined by the sign of a joint parameter solely.The results show that those optical waves are general,in the sense that no specified conditions on the material parameters are taken on.Considering the long-wave limit,the derived pulse-trains degenerate to soliton pulses of the quartic and dipole kinds.Results in this study may be useful for experimental realization of pulse-trains in highly dispersive optical fibers and further understanding of their optical transmission properties. 展开更多
关键词 pulse-train propagation in a nonlinear Kerr medium higher-order dispersion quartic and dipole solitons nonlinear Schrödinger equation dispersion effects up to the fourth order
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An improved nonlinear vibration absorber with adjustable stiffness and rotating mass 认领 引用 被引量：1
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作者 Ke-Fan Xu Zhuo-Da Zhou +1 位作者 Ye-Wei Zhang Li-Qun Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期146-157,共12页
A novel approach for vibration reduction is proposed by improving an adjustable stiffness nonlinear vibration absorber(NVA)with a rotating mass system.The adjustable stiffness is realized by a buckling Euler beam and ... A novel approach for vibration reduction is proposed by improving an adjustable stiffness nonlinear vibration absorber(NVA)with a rotating mass system.The adjustable stiffness is realized by a buckling Euler beam and an active control system.The rotating mass is consisted of a primary mass block and two rotating mass blocks.The dynamic responses are analyzed based on nonlinear output frequency response functions.The results indicate that,in comparison to the adjustable stiffness NVA,the enhanced NVA can efficiently suppress the resonance in steady state response.Moreover,the new vibration absorber can improve the robustness of the adjustable stiffness NVA.The mass ratio and the angular velocity are two key parameters of the new vibration absorber with optimal values for effective vibration reduction.The new vibration absorber introduces new possibilities for incorporating the adjustable stiffness and the rotating mass system in the design of NVA. 展开更多
关键词 Nonlinear vibration absorber Adjustable stiffness Rotating mass Vibration reduction
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Nonlinear Stress Relaxation of End-associative Hydrophobically Modified Ethoxylated Urethane(HEUR)Solutions under Step Strain 认领 引用 被引量：1
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作者 Yu-Xuan Pei Quan Chen Hiroshi Watanabe 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第6期1790-1803,I0014,共14页
Nonlinear stress relaxation under step strainγwas examined for aqueous solutions of an end-associative telechelic polymer,hydrophobically modified ethoxylated urethane(HEUR)having hexadecyl groups at the two ends of ... Nonlinear stress relaxation under step strainγwas examined for aqueous solutions of an end-associative telechelic polymer,hydrophobically modified ethoxylated urethane(HEUR)having hexadecyl groups at the two ends of the chain.At 20℃ where the end hexadecyl groups were in the molten liquid state,the solutions with the HEUR concentrations c=1 wt%and 5 wt%commonly exhibited strain-hardening at short time t and the strain-softening(damping)at long t.In the terminal relaxation zone at sufficiently long t,the nonlinear relaxation modulus G(t,γ)was found to obey the time-strain separability.These nonlinear features were discussed in relation to strain-induced changes in the associative network structure.In the aqueous HEUR solutions,aggregates of the precipitated end-groups should be stabilized by loops of dissolved HEUR backbones to form so-called flower micelles.At low c,most of those micelles would connect HEUR chains into a long linear sequence referred to as superbridge,thereby forming a sparse network.At higher c,those superbridges would become shorter to densify the network accordingly.Immediately after imposition of the large step strain,the flower micelles in the superbridge backbone would fuse each other to form a denser network thereby exhibiting the hardening.This micelle fusion would be more significant for longer superbridges to enhance the strain hardening at lower c.After this fusion,the micelles having liquid cores would be opened up because of the enhanced tension of the deformed superbridge,and then split to disconnect the superbridge if this tension overwhelms the micelle strength.This opening/splitting process possibly resulted in the partial breakage of the network and the corresponding softening.Finally,the surviving part of the network would relax on thermal dissociation of the remaining micelles thereby exhibiting the time-strain separable damping at long t.These features were semi-quantitatively described by a simple model that considered the strain-induced fusion followed by mechanical opening/breakage of the transient crosslinks. 展开更多
关键词 Telechelic polymer Nonlinear stress relaxation Strain hardening Strain softening Time-strain separability
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A Novel Finite-Time Stability Criterion for Nonlinear Systems Involving Flexible Delayed Impulses 认领 引用
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作者 Shuchen Wu Xiaodi Li Shiji Song 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期746-748,共3页
Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impu... Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impulsive signals,allowing them to arbitrarily span one or more impulse instants.Sufficient Lyapunov-based conditions for FTS of such systems are presented,where a novel class of impulse time sequences is established for all admissible uncertainties of delayed impulses. 展开更多
关键词 delayed impulsesthe impulsive signalsallowing finite time stability nonlinear systems Lyapunov based conditions time varying delays nonlinear impulsive systems delayed impulses
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Spectral Narrowing in Nonlinear Compton Scattering via Chirped Laser Pulses 认领 引用
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作者 Xiao-Hu Ji Aihua Liu Li-Guang Jiao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期62-73,共12页
Spectral broadening due to ponderomotive effects significantly limits the spectral brightness of light sources generated by nonlinear Compton scattering.In this study,within the strong-field quantum electrodynamics fr... Spectral broadening due to ponderomotive effects significantly limits the spectral brightness of light sources generated by nonlinear Compton scattering.In this study,within the strong-field quantum electrodynamics framework,we demonstrate that equal-power frequency-chirped laser pulses can significantly suppress spectral broadening by combining frequency modulation with temporal pulse extension. 展开更多
关键词 ponderomotive effects nonlinear compton scatteringin spectral narrowing spectral broadening nonlinear Compton scattering chirped laser pulses light sources combining frequency modulation temporal pulse extension
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Photo-crosslinked Second-order Nonlinear Optical Polymer Films with Large Nonlinear Optical Effect and High Thermostability 认领 引用
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作者 Pan-Pan Qiao Qian-Qian Li Zhen Li 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第4期1007-1016,I0012,共10页
One of the most significant challenges in commercializing organic second-order nonlinear optical(NLO)materials lies in the inherent trade-off between nonlinearity and stability.A key factor in mitigating this compromi... One of the most significant challenges in commercializing organic second-order nonlinear optical(NLO)materials lies in the inherent trade-off between nonlinearity and stability.A key factor in mitigating this compromise is achieving precise temporal synchronization between the formation of the cross-linked network and the establishment of an optimal non-centrosymmetric alignment of the chromophores.Guided by this principle,we developed a series of NLO polymers incorporating multiple ether chains with low rotational energy barriers,which facilitate molecular reorientation during electric field poling,thereby enhancing the NLO response effectively.Combined with an optimized photocrosslinking strategy,the resulting PX4o/PETMP doped film achieved large macroscopic NLO coefficient of 190 pm·V-1and thermal degradation temperature as high as 120℃.This work offers a universal approach to alleviating the“nonlinearity-stability”trade-off in a wide range of polymeric systems. 展开更多
关键词 Second-order nonlinear optical effect Thermostability "Nonlinearity-stability"trade-off Photo-crosslinking
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A Continuous-Time Framework of Model-Free Adaptive Control for Nonlinear Plants 认领 引用
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作者 Hao Yu Wangjiang Li +2 位作者 Linxin Che Dawei Shi Zhongsheng Hou 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第4期966-982,共17页
Continuous-time model-free adaptive control frameworks are proposed in this paper for solving tracking problems of unknown nonlinear plants described by high-order differential equations.To tackle situations where no ... Continuous-time model-free adaptive control frameworks are proposed in this paper for solving tracking problems of unknown nonlinear plants described by high-order differential equations.To tackle situations where no form or structural information of plant models is present,the first step involves introducing continuous-time dynamic linearization techniques to create data models.Based on different ways for generating control inputs,two kinds of dynamic linearization processes for continuous-time nonlinear plants are established for the first time,where the nonlinear plants are parameterized by a time-varying linear data model.In the first dynamic linearization model(DLM),the control input is calculated by designating its derivative while the second one gives directly control inputs.Then,after acquiring different dynamic linearization models,based on traditional backstepping methods,adaptive laws are proposed to learn the timevarying parameters in DLMs and the corresponding model-free adaptive controllers are designed.The conditions on designable parameters for the proposed controllers are provided to ensure semi-global practical stabilization and arbitrarily desirable ultimate tracking accuracy.Moreover,to eliminate the effects of unknown equilibrium points on tracking accuracy,a continuoustime model-free adaptive controller with pure integral terms is proposed under the second dynamic linearization model.Finally,several practical and numerical examples are simulated to illustrate the feasibility and efficiency of the proposed results. 展开更多
关键词 Backstepping methods continuous-time systems dynamic linearization model-free adaptive control (MFAC) nonlinear systems
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Inherent nonreciprocity in double-alternating nonlinear metamaterial 认领 引用
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作者 M.H.BAE J.H.PARK +2 位作者 C.S.PARK H.LEE H.M.SEUNG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第7期1487-1510,共24页
Metamaterial-based nonreciprocity has emerged as a promising frontier for novel wave manipulation,yet most realizations rely on external biasing or auxiliary mechanisms,restricting their robustness and applicability.H... Metamaterial-based nonreciprocity has emerged as a promising frontier for novel wave manipulation,yet most realizations rely on external biasing or auxiliary mechanisms,restricting their robustness and applicability.Here,we investigate the inherent nonreciprocity in a nonlinear metamaterial without any external apparatus.Fundamentally,since structural asymmetry governs the internal mode distribution,amplitudedependent nonlinearity inevitably creates distinct boundary-excitations for forward and backward waves,inherently leading to nonreciprocity.To effectively combine structural asymmetry with nonlinearity,we leverage a diatomic configuration as a robust baseline,and introduce alternating nonlinear stiffnesses.We develop a rigorous analytical framework based on the Rayleigh-Schr¨odinger perturbation to capture the amplitude-dependent dispersion of the asymmetric unit cell.The numerical simulations validate the analytical predictions,and demonstrate direction-specific bandgap modulation for forward and backward waves.This study advances the understanding of nonlinear dynamics by elucidating how the interplay between structural asymmetry and nonlinearity passively induces nonreciprocal transmission,offering a pathway toward self-adaptive wave control systems. 展开更多
关键词 nonlinear metamaterial nonreciprocity amplitude-dependent bandgap perturbation
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A novel multi-coupled neural network for nonlinear dynamic prediction of mistuned bladed disk 认领 引用
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作者 Yuxuan Zhao Zhufeng Liu +3 位作者 Guojia Li Peiyu Wang Di Zhang Yonghui Xie 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期175-196,共22页
In order to overcome the limitations of low computational efficiency in existing solution methods for analyzing the nonlinear dynamic characteristics of gas turbine,and the lack of physical interpretability of traditi... In order to overcome the limitations of low computational efficiency in existing solution methods for analyzing the nonlinear dynamic characteristics of gas turbine,and the lack of physical interpretability of traditional surrogate models,a multi-coupled neural network(MCNN)has been proposed for predicting three-level pivotal dynamic parameters,including node-level temporal dynamics at contact surfaces,component-level spatial responses of mistuned blades,and system-level damping performance of bladed disk.A high-fidelity finite element reduced-order model of a full-circle turbine-bladed disk is constructed,and the nonlinear solution method is employed to generate the training dataset for the proposed neural network.The results show that the MCNN framework achieves superior accuracy and computational efficiency in predicting dynamic characteristics of bladed disks compared to traditional solution methods.The prediction errors in both time-domain and frequency-domain responses are within 0.1%,and the prediction errors in the amplitude amplification coefficient and modal damping ratio are less than 2%and 2.5%,respectively,outperforming traditional machine learning methods.In terms of computational time,the calculation speed of MCNN for a single case is improved by five orders of magnitude over traditional methods.The proposed MCNN framework can comprehensively and efficiently present the nonlinear dynamic characteristics of gas turbine bladed disks under multiple operating conditions,providing a rapid and accurate analysis tool for preliminary design and further optimization of gas turbine bladed disks in engineering scenarios. 展开更多
关键词 Gas turbine Deep learning Mistuning Nonlinear dynamics Damping performance
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Rock-concrete composite specimens with different interface inclination angles:Creep characteristics and nonlinear damage constitutive model 认领 引用
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作者 YAO Wei-jing NOUBISSI KENGNE Honorine +2 位作者 LIU Yu PANG Jian-yong XU Han-bing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期968-986,共19页
Weak rock-concrete interfaces significantly affect the stability of underground supporting structures.This study aims to investigate the effects of interface inclination on the creep behavior and failure mechanisms of... Weak rock-concrete interfaces significantly affect the stability of underground supporting structures.This study aims to investigate the effects of interface inclination on the creep behavior and failure mechanisms of composite specimens.Seven rock-concrete composite specimens with different inclination angles under hydrothermal curing at 60℃were prepared,and uniaxial and graded loading creep tests were completed.The results show that with increasing interface inclination,the compressive strength of the composite specimens initially decreases and then increases,with the minimum strength observed at inclinations between 60°and 75°.Three typical failure patterns were identified:axial failure,composite failure,and interface failure.The creep failure strength exceeded the uniaxial compressive strength,indicating improved time-dependent deformation resistance under elevated temperature curing.The instantaneous strain initially decreases and then increases as the interface inclination angle grows.Compared to 0°inclination,specimens with 45°,60°,75°,and 90°inclinations exhibited reductions in instantaneous strain of 2.64%,18.84%,23.29%,and 0.73%,respectively.The steady-state creep rate and creep ratio exhibited a decrease-stabilization-increase trend with increasing stress levels.Creep strain increased with increasing stress levels for all inclinations,with a sharp increase near the failure stage.A nonlinear constitutive model considering interface inclination and creep damage was developed based on damage theory.A nonlinear damage-based constitutive model incorporating interface inclination effects was developed,and its theoretical predictions closely matched the experimental data in all creep stages.These findings provide a quantitative understanding of creep failure mechanisms in rock-concrete interfaces and provide practical references for enhancing the safety of underground support systems. 展开更多
关键词 rock-concrete composite interface inclination stress level creep nonlinear damage model
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Reconfigurable nonreciprocal isolation enabled by nonlinear spoof surface plasmons 认领 引用
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作者 ZHEN LIAO JUN LI +3 位作者 CHENHAO HUANG YUN LI GUO QING LUO LEILEI LIU 《Photonics Research》 SCIE EI CAS CSCD 2026年第5期2189-2198,共10页
Spoof plasmonics,with unique quasi-optical and quasi-electrical properties,have emerged as a promising route toward compact,high-speed,and CMOS-compatible devices for next-generation integrated systems.A key requireme... Spoof plasmonics,with unique quasi-optical and quasi-electrical properties,have emerged as a promising route toward compact,high-speed,and CMOS-compatible devices for next-generation integrated systems.A key requirement for advancing such circuits is nonreciprocal functionality,which enables signal routing,source protection,and suppression of backscattering.Conventional nonreciprocal schemes,however,typically rely on bulky magnetic components that lack tunability and remain incompatible with compact integrated platforms. 展开更多
关键词 reconfigurable spoof plasmonicswith bulky magnetic components nonreciprocal functionalitywhich isolation signal routingsource nonlinear compact integrate
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A multi-scale analysis method considering the realistic fiber structure for the nonlinear mechanical behavior of 3D needled twill composites 认领 引用
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作者 Jianwei Qiao Jingran Ge +2 位作者 Zengfei Liu Qi Zhang Jun Liang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期303-326,共24页
Three-dimensional needled twill composites have an extremely complex fiber structure,making investigating the nonlinear mechanical behavior challenging.This paper develops a multi-scale analysis method considering rea... Three-dimensional needled twill composites have an extremely complex fiber structure,making investigating the nonlinear mechanical behavior challenging.This paper develops a multi-scale analysis method considering realistic fiber structure to predict the behavior.With the method,the damage evolution processes of different typical regions in the composites are analyzed in detail.Under in-plane loading,there is a platform area in the unneedled area,and the damage of the matrix and felt is distributed along the 45°direction in the plane.In the single-needled area,the damage of the matrix and felt occurs around the needled hole and expands perpendicularly to the load.The yarns in different typical areas primarily exhibit transverse damage,concentrated in the interweaving areas.Under out-of-plane loading,the damage of the yarn and matrix is distributed on the upper and lower surfaces,with the felt showing no damage.In addition,a periodic unit cell model including different typical areas is built to analyze the nonlinear mechanical behavior of composites.The stress-strain curves predicted by the model are aligned well with the experimental results.The developed method effectively predicts the nonlinear mechanical behavior of composites,captures the damage evolution mode of different typical areas,and provides guidance for the application of composites. 展开更多
关键词 Carbon fibers Nonlinear behavior Finite element analysis Needled composites
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Design of a nonlinear stiffness metastructure isolator for powered wearable devices vibration isolation 认领 引用
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作者 Shikai Jin Wenjie Ge +2 位作者 Bin Liu Zhuo Wang Ning Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期86-103,共18页
The vibration control performance of powered wearable devices(PWDs)directly affects the health and comfort of the wearer.Effective vibration isolation technology has become a fundamental aspect of next-generation wear... The vibration control performance of powered wearable devices(PWDs)directly affects the health and comfort of the wearer.Effective vibration isolation technology has become a fundamental aspect of next-generation wearable device design.This study proposes a highly integrated nonlinear stiffness metastructure vibration isolator design for PWDs to address vibration isolation requirements in such scenarios.In this paper,we systematically analyze and experimentally verify the static characteristics of the proposed metastructure vibration isolator through numerical analysis,analytical model and experimental methods,and deeply discuss its dynamic transmissibility characteristics.Among them,we analytically derive and calculate the cantilever beam oscillator of the metastructure vibration isolator and verify the numerical results.Utilizing the mode superposition method,we examine the variations in vibration transmissibility under different operating conditions and geometric parameters.Experimental results are consistent with the numerical calculation results and demonstrate that the isolator exhibits excellent vibration attenuation within the vibration isolation frequency range of 53-61 Hz,achieving a minimum vibration transmissibility of−38 dB.The metastructure vibration isolation system presented in this study successfully achieves the anticipated vibration suppression performance,offering a novel approach to vibration isolation design for PWDs. 展开更多
关键词 Powered wearable devices Nonlinear stiffness Vibration isolator Metastructure
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