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Real-time traffic enhancement scheduling for train communication networks based on TSN

Journal of Traffic and Transportation engineering(English Edition) 2025年第1期12卷 34-51页

作者： Deqiang He Zeqian Chen Daliang Sun Zhenzhen Jin Yanjun Chen Rui Ma Chen Liang Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing TechnologySchool of Mechanical EngineeringGuangxi University

With the increasing data volume of train on-board system, real-time performance has become the most critical factor to ensure the safety of train operation. Considering that standard Ethernet cannot meet the real-time requirement of existing train communication network(TCN), the time-sensitive network(TSN) technology for TCN is introduced. To solve the time-delay problem, an adaptive switch queue selection mechanism for traffic scheduling is proposed. Firstly, the topology model of TCN based on TSN and the traffic model are described. Then, the K shortest path routing algorithm based on load balancing provides the optimal routing for the scheduling process. Finally, the adaptive switch queue selection mechanism is introduced to solve the aggregation flow conflict problem effectively, queue resources are properly allocated, and the gate control list(GCL) of each frame in the queue is obtained. Experimental results show that compared with the traditional constraint model, the schedulability of the model with an adaptive switch queue selection mechanism increases by 33.0%, and the maximum end-to-end delay and network jitter decrease by 19.1% and 18.6% on average respectively. It can provide theoretical support and application reference for the real-time performance optimization of TCN based on TSN.

关键词： Train communication network Time-sensitive network Adaptive switch queue selection mechanism Gate control list Real-time

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DCM-based dynamic stable walking under terrain-induced time-varying disturbances for humanoid robots

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Science China(Technological Sciences) 2025年第4期68卷 105-117页

作者： Yan LUO Chao LIU Jianhua WU Zhenhua XIONG Han DING State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

When humanoid robots attempt to walk on terrain such as shaking platforms,time-varying disturbances are introduced to the support *** abrupt changes of inclination angle can cause the robot to lose balance upon landing,presenting significant challenges for balance control *** address this issue,we propose a novel divergent component of motion(DCM)-based time-varying disturbance walking(DCM-TVDW)*** method allows the robot to walk on rugged surfaces and helps to maintain dynamic balance when subjected to large time-varying *** the DCM-TVDW control method,we first adjust the robot's center of mass and stride height to adapt to transitions between different terrain types via a variable height stabilization method,and hold these quantities constant as base *** then combine DCM with the N-step capturability *** combination allows for dynamic balance through multi-step adjustments from the initially unstable region,thereby extending the robots stability *** and experimental results demonstrate that the DCM-TVDW method enables the SJ-Bruce robot to traverse a dynamically shaking platform with an inclination angle of approximately 22°.

关键词： humanoid robot dynamic balance control capturability time-varying disturbance

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High-temperature strength of gel casting silica-based ceramic core

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China Foundry 2025年第2期22卷 128-138页

作者： Hai-tian Zhang Yan Liu Cheng-dong Wang Zhong-liang Lu Kai Miao Sai Li Yu Han Di-chen Li State Key Laboratory of Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China

Considering the fracture problem of the silica-based ceramic core in the integrated casting of hollow turbine blades during directional solidification,the influence of various whiskers,including silicon carbide whiskers,silicon nitride whiskers,and mullite whiskers,on the high-temperature strength of the silica-based ceramic core was ***,the formation of microstructure morphology and phase structure was *** results show that silicon carbide whiskers can reduce the microcracks caused by the shrinkage of *** the sintering process,some of the silicon carbide whiskers oxidize and react with aluminum powder to form mullite,which can improve the high-temperature strength of the ceramic *** the content of silicon carbide whiskers is 3wt.%,the high-temperature bending strength of the cores reaches the maximum value of 21 *** nitride whiskers decompose in a high-temperature environment and react with aluminum powder in the matrix material to form mullite *** the content of silicon nitride whiskers is 5wt.%,the high-temperature bending strength of the cores reaches 20 *** adding mullite whiskers,a structure of cristobalite wrapped mullite whiskers can be formed to achieve *** the content of mullite whiskers is 4wt.%,the high-temperature bending strength can reach 17.2 *** comparing the performance of silicon carbide whiskers,silicon nitride whiskers,and mullite whiskers,along with conducting slurry viscosity tests and casting experiments,it is determined that a ceramic slurry containing 4wt.%mullite whiskers is the most suitable for making the cores used in the integrated casting of hollow turbine blades.

关键词： hollow turbine blades ceramic core gel-casting high-temperature strength whisker

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An Iterative Tuning Method for Feedforward Control of Parallel Manipulators Considering Nonlinear Dynamics

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Chinese Journal of Mechanical engineering 2025年第1期38卷 295-305页

作者： Xiaojian Wang Jun Wu Beijing Key Laboratory of Transformative High-end Manufacturing Equipment and Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment and Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Feedforward control is one of the most effective control techniques to increase the robot’s tracking ***,most of the dynamic models used in the feedforward controllers are linearly simplified such that the nonlinear and time-varying characteristics of dynamics in the workspace are *** this paper,an iterative tuning method for feedforward control of parallel manipulators by taking nonlinear dynamics into account is *** on the robot rigid-body dynamic model,a feedforward controller considering the dynamic nonlinearity is *** iterative tuning method is given to iteratively update the feedforward controller by minimizing the root mean square(RMS)of the joint errors at each *** effectiveness and extrapolation capability of the proposed method are validated through the experiments on a 2-DOF parallel *** research proposes an iterative tuning method for feedforward control of parallel manipulators considering nonlinear dynamics,which has better extrapolation capability in the whole workspace of manipulators.

关键词： Parallel manipulator Dynamic model Feedforward control Iterative learning control Parameter design

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An optical carbon nanotube fibre probe for measurement of nano structures with large aspect ratio

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Nano Research 2025年第3期18卷 436-443页

作者： Weihao Tao Shuhao Zhao Hanjin Dong Ze Zhang Peirui Ji Shenghan Qin Wenbo Hu Jinlong Zhu Renjie Zhou Shuming Yang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Department of Biomedical Engineering The Chinese University of Hong KongHong KongChina

With the development of imaging and measurement technologies,scanning near-field optical microscopy(SNOM)has achieved high signal-to-noise *** resolution of a fibre probe-based SNOM system is capable of reaching 10 ***,SNOM applications are presently constrained to the measurement of near-field optical information to relatively straightforward structures,including quantum dots,carbon nanotubes,graphene,and so *** geometry of conventional fibre probes,with tips at an angle of 30°-60°,presents a challenge for accurately imaging complex surface *** paper proposes a carbon nanotube composite fibre probe(CNT-FP)with a large aspect *** key point is that a carbon nanotube bundle is composited at the tip of conventional surface plasmon polaritons fibre probes(SPPs-FP),which are the fibre probes coated with gold film to excite the *** coupling,propagation,and focusing effects of SPPs on the carbon nanotube bundle are ***-FPs have been fabricated and applied to measure a grating with the depth of 400 nm and the width of 400 *** experimental results show that the measurement accuracy and imaging quality of CNT-FP are nearly one order of magnitude higher than that of conventional SPPs-FP,as evidenced by evaluation criteria such as line roughness and volatility ***,it achieves an optical resolution of 72.1 nm in the measurements of a nano structure with large aspect *** provides an effective solution of measuring structures with larger aspect ratios.

关键词： carbon nanotubes fibre optic probes surface plasmon polaritons nano-focusing large aspect ratio

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Interfacial coupling enables high carrier mobility in PbS colloidal quantum dot photodetectors

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Nano Research 2025年第3期18卷 619-630页

作者： Qing Li Lier Deng Yuxuan Du Shasha Chang Shuai Wen Rui Qin Jiuhong Wang Wenzhi Feng Boao Gu Huan Liu Key Laboratory of the Ministry of Education&Thin Film and Optical Manufacturing Technology School of Opto-Electronic EngineeringXi'an Technological UniversityXi'an 710021China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

Carrier transport in colloidal quantum dot(CQD)films is strongly influenced by the interfacial coupling between ***,the shape of PbS CQDs synthesized using traditional methods results in random orientation relationships between the crystal facets in CQD films,limiting the coupling strength and the final performance of optoelectronic *** this study,post-synthesis surface treatment of PbS CQDs was employed to achieve facet control during secondary growth,manipulating the facets of PbS CQDs at the nanoscale to enhance interfacial coupling within CQD ***,mixed ligands of PbX_(2)(X=Br,I)and anhydrous sodium acetate were used to passivate the PbS CQDs,ensuring sufficient *** method combines facet passivation with strong coupling through the(100)facets of CQDs,thereby enhancing carrier mobility and improving device *** results showed that,compared to standard PbS CQD films,the electron and hole mobilities of the PbS CQD films subjected to secondary growth were significantly improved,with hole mobility increased by 6 *** fabricated using these films achieved a quantum efficiency of 33%at 1500 nm under 0 V bias,a threefold improvement compared to standard devices.

关键词： interfacial coupling carrier mobility liquid-phase atomic layer deposition liquid-phase ligand exchange PbS colloidal quantum dot photodetectors

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Lignin-derived carbon fibers:A green path from biomass to advanced materials

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Carbon Energy 2025年第3期7卷 11-33页

作者： Li Yan Hai Liu Yanfan Yang Lin Dai Chuanling Si State Key Laboratory of Biobased Fiber Manufacturing Technology Tianjin Key Laboratory of Pulp and PaperCollege of Light Industry and EngineeringTianjin University of Science and TechnologyTianjinChina

Carbon fibers(CFs)with notable comprehensive properties,such as light weight,high specific strength,and stiffness,have garnered considerable interest in both academic and industrial fields due to their diverse and advanced ***,the commonly utilized precursors,such as polyacrylonitrile and pitch,exhibit a lack of environmental sustainability,and their costs are heavily reliant on fluctuating petroleum *** meet the substantial market demand for CFs,significant efforts have been made to develop cost-effective and sustainable CFs derived from ***,the most abundant polyphenolic compound in nature,is emerging as a promising precursor which is well-suited for the production of CFs due to its renewable nature,low cost,high carbon content,and aromatic ***,the majority of lignin raw materials are currently derived from pulping and biorefining industrial by-products,which are diverse and heterogeneous in nature,restricting the industrialization of lignin-derived *** review classifies fossil-derived and biomass-derived CFs,starting from the sources and chemical structures of raw lignin,and outlines the preparation methods linked to the performance of lignin-derived CFs.A comprehensive discussion is presented on the relationship between the structural characteristics of lignin,spinning preparation,and structure-morphology-property of ligninderived ***,the potential applications of these materials in various domains,including energy,catalysis,composites,and other advanced products,are also described with the objective of spotlighting the unique merits of ***,the current challenges faced and future prospects for the advancement of lignin-derived CFs are proposed.

关键词： advanced materials carbon fibers chemical structure lignin valorization

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Fabrication of bamboo-inspired continuous carbon fiber-reinforced SiC composites via dual-material thermally assisted extrusion-based 3D printing

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材料科学技术（英文版） 2025年第5期208卷 92-103页

作者： Sai Li Haitian Zhang Zhongliang Lu Fusheng Cao Ziyao Wang Yan Liu Xiaohui Zhu Shuai Ning Kai Miao Shaoyu Qiu Dichen Li State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Intelligent Manufacturing Modern Industry Xinjiang UniversityUrumqi 830046China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Ceramic matrix composites(CMCs)structural components encounter the dual challenges of severe mechanical conditions and complex electromagnetic environments due to the increasing demand for stealth technology in aerospace *** address various functional requirements,this study integrates a biomimetic strategy inspired by gradient bamboo vascular bundles with a novel dual-material 3D print-ing *** distinct bamboo-inspired structural configurations Cf/SiC composites are designed and manufactured,and the effects of these different structural configurations on the CVI process are *** method is utilized to characterize the relationship between interface bonding strength and mechanical *** results reveal that the maximum flexural strength and fracture toughness reach 108.6±5.2 MPa and 16.45±1.52 MPa m1/2,respectively,attributed to the enhanced crack propagation resistance and path caused by the weak fiber-matrix ***,the bio-inspired configuration enhances the dielectric loss and conductivity loss,exhibiting a minimum reflection loss of-24.3 dB with the effective absorption band of 3.89 *** work introduces an innovative biomimetic strategy and 3D printing method for continuous fiber-reinforced ceramic composites,expanding the ap-plication of 3D printing technology in the field of CMCs.

关键词： 3D printing Cf/SiC composites Mechanical properties Electromagnetic wave absorption

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A real-time multi-head mixed attention mechanism-based prediction method for tunnel boring machine disc cutter wear

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Science China(Technological Sciences) 2025年第1期68卷 286-307页

作者： Haodi WANG Chengjin QIN Honggan YU Zhinan ZHANG Guoqiang HUANG Zhengyang LIU Chengliang LIU State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In the process of hard rock tunnel excavation,workers often need to enter the tunnel boring machine(TBM)cutterhead at regular intervals to measure cutter ***,this method is time-consuming and *** cutter prediction models primarily rely on geological parameters to predict overall cutter wear before construction,making it challenging to monitor real-time wear at different locations of the cutter and obtain accurate geological *** address these challenges,this paper proposes a multi-head mixed attention mechanism-based method for real-time wear prediction of TBM disc ***,a method of cutter wear normalization to eliminate measurement noise is ***,considering the complex correlation of TBM operating parameters in feature and time dimensions,a new multi-head mixed attention mechanism model is designed to establish the dependency between different features and different moments,to better establish the mapping model between operating parameters and cutter ***,the current cutter wear state can be calculated by accumulating the wear amount of all previous small excavation *** effectiveness of the method is verified by using field data from the Mumbai *** results demonstrate that the method is capable of real-time prediction of front cutter and edge cutter wear on the test set,achieving an average accuracy rate of 95.75%.Moreover,the method can update the cutter wear status after every meter of excavation,which has good real-time *** addition,the average accuracy of cutter wear prediction of the proposed method is 11.75%,10.375%,3.875%,3.625%,1.375%,3.125%,2.25%,and 0.75%higher than that of LSTM,CNN,LSTM-CNN,CACNN,SACNN,MMADNN,MTACNN,and *** summary,this approach offers an accurate prediction of cutter wear state while reducing inspection time and costs and has high application value.

关键词： tunnel boring machine cutter wear estimation multi-head mixed attention mechanism real time

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Novel multi-waypoint planning methods based on intermediate state optimization

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Science China(Technological Sciences) 2025年第3期68卷 179-191页

作者： Xinyu QIN Guangbao ZHAO Zixuan LIAO Chao LIU Zhenhua XIONG State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China

Multi-waypoint planning is essential for manipulators to execute complex tasks *** requires the manipulator to swiftly traverse designated waypoints while adhering to all the kinematic ***,previous research has not fully exploited the kinematic capabilities of manipulators and has overlooked collision *** address these problems,this paper presents two novel methods called recursive intermediate state optimization(RISO)and overall intermediate state optimization(OISO).RISO decomposes the multi-waypoint planning problem into a sequence of one-waypoint planning tasks,employing a recursive approach to generate feasible solutions *** utilizes an improved whale optimization algorithm(WOA),incorporating multiple iterative processes to perform secondary optimization in high-dimensional space based on the initial value,yielding better *** proposed methods have been validated on a six-degree-of-freedom manipulator platform and compared with several traditional algorithms,as well as the state-of-the-art algorithm,*** results show that RISO outperforms Ruckig in scenarios where computation time is critical,while OISO is better suited for scenarios where trajectory quality is prioritized over ***,the proposed methods can also handle collisions,ensuring the generation of collision-free trajectories.

关键词： multi-waypoint planning intermediate state optimization aerial photography task

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