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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 UniversityNanning530004China

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 *** that standard Ethernet cannot meet the real-time requirement of existing train communication network(TCN),the time-sensitive network(TSN)technology for TCN is *** solve the time-delay problem,an adaptive switch queue selection mechanism for traffic scheduling is ***,the topology model of TCN based on TSN and the traffic model are ***,the K shortest path routing algorithm based on load balancing provides the optimal routing for the scheduling ***,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 *** 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 *** 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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Obstacle avoidance in human-robot cooperative transportation with force constraint

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Science China(Information Sciences) 2023年第1期66卷 334-335页

作者： Ying ZHANG Chenguang YANG Sheng XU Yongsheng OU College of Automation Science and Engineering South China University of Technology Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences

Dear editor,Robots are often conceived as human-like machines that can interact with humans naturally and safely. Human-robot interaction means that robots can communicate with people,understand their needs, and act accordingly [1]. This interaction is critical when two people are needed to finish a task cooperatively.

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Development of High-Speed On-Of Valves and Their Applications

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 21-41页

作者： He Wang Zhen Chen Jiahai Huang Long Quan Bin Zhao Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

With the widespread application of the computer and microelectronic technology in the industry,digitization becomes the inevitable developing trend of the hydraulic *** of the hydraulic components is critical in the digital hydraulic ***-speed on-of valves(HSVs)which convert a train of input pulses into the fast and accurate switching between the on and of states belong to widely used basic digital hydraulic *** some ways,the characteristics of the HSVs determine the performance of the digital hydraulic *** paper discusses the development of HSVs and their ***,the HSVs with innovative structures which is classifed into direct drive valves and pilot operated valves are discussed,with the emphasis on their ***,an overview of HSVs with intelligent materials is presented with considering of the switching frequency and fow ***,the applications of the HSVs are reviewed,including digital hydraulic components with the integration of the HSVs and digital hydraulic systems controlled by the HSVs.

关键词： High-speed on-of valve Digital hydraulic component Switching frequency Flow rate Innovative structure Intelligent material

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High efficiency and dynamic modulation of nonlinear metasurfaces

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Light(Science & Applications) 2024年第11期13卷 2424-2426页

作者： Ruizhe Zhao Lingling Huang Beijing Engineering Research Center of Mixed Reality and Advanced Display MIIT Key Laboratory of Photoelectronic Imaging Technology and System of Ministry of Education of ChinaSchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Metasurfaces have facilitated numerous innovative applications in the scope of nonlinear ***,dynamically tuning the nonlinear response at the pixel level is very *** work proposed a novel method to electrically manipulate the local amplitude and phase of third-harmonics generation(THG)by integrating the giant nonlinear responses resulting from intersubband transitions of multiple quantum wells(MQW)with plasmonic *** demonstrated method may pave the way to realize nonlinear optical elements with versatile functionalities by electrically tuning and promoting the advancements of innovative applications such as lidar,3D displays,optical encryption,optical computing,and so on.

关键词： nonlinear harmonics integrating

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Evaluation on Configuration Stiffness of Overconstrained 2R1T Parallel Mechanisms

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 62-82页

作者： Xuejian Ma Zhenghe Xu Yundou Xu Yu Wang Jiantao Yao Yongsheng Zhao Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China

Currently,two rotations and one translation(2R1T)three-degree-of-freedom(DOF)parallel mechanisms(PMs)are widely applied in five-DOF hybrid machining ***,there is a lack of an effective method to evaluate the configuration stiffness of mechanisms during the mechanism design *** is a challenge to select appropriate 2R1T PMs with excellent stiffness performance during the design *** the operational status of 2R1T PMs,the bending and torsional stiffness are considered as indices to evaluate PMs'configuration ***,a specific method is proposed to calculate these stiffness ***,the various types of structural and driving stiffness for each branch are assessed and their specific values ***,a rigid-flexible coupled force model for the over-constrained 2R1T PM is established,and the proposed evaluation method is used to analyze the configuration stiffness of the five 2R1T PMs in the entire ***,the driving force and constraint force of each branch in the whole working space are calculated to further elucidate the stiffness evaluating results by using the proposed method *** obtained results demonstrate that the bending and torsional stiffness of the 2RPU/UPR/RPR mechanism along the x and y-directions are larger than the other four mechanisms.

关键词： Parallel mechanism Stiffness Over-constrained Three degrees of freedom

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Shock Characteristics and Protective Design of Equipment During Spacecraft Docking Process

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Acta Mechanica Solida Sinica 2023年第6期36卷 837-850页

作者： Xu Gao Xianxian He Yingying Wu Yifeng Dong Jiajing Huo Ying Li Beijing Institute of Spacecraft System Engineering Beijing 100094China School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan 430064China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

The shock loads generated by spacecraft during docking can cause functional failure and structural damage to aerospace electronic equipment and even lead to catastrophic flight *** is currently a lack of systematic and comprehensive research on the shock environment of spacecraft electronic equipment due to the diversity and complexity of the shock *** this paper,the validity of the finite element model is verified based on the sinusoidal vibration experiment results of the spacecraft reentry *** method of shock dynamic response analysis is used to obtain the shock environment of electronic equipment under different shock *** shock response spectrum is used to describe the shock environment of aerospace electronic *** results show that the resonance frequency error between the sinusoidal vibration experiment and the model is less than 4.06%.When the docking relative speed of the reentry capsule is 2 m/s,the shock response spectrum values of one of the equipment are 30 m^(2)/s,0.67 m/s,and 0.059 m,*** wire rope spring on the mating surface can provide vibration isolation and shock *** increase in spring damping coefficient results in a decrease in the amplitude and time of the vibration *** increase in spring stiffness reduces the input of shock load within a certain *** research results can provide guidance for the design and evaluation of shock environmental adaptability of aerospace electronic equipment.

关键词： Shock environment Shock response spectrum Spacecraft docking Protective design

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Token-Picker: Accelerating Attention in Text Generation with Minimized Memory Transfer via Probability Estimation 24

Token-Picker: Accelerating Attention in Text Generation with...

引用

61st ACM/IEEE Design Automation Conference, DAC 2024

作者： Park, Junyoung Kang, Myeonggu Han, Yunki Kim, Yang-Gon Shin, Jaekang Kim, Lee-Sup Korea Advanced Institute of Science and Technology Korea Republic of System LSI Samsung Electronics Korea Republic of

ISBN: (纸本)9798400706011

The attention mechanism in text generation is memory-bounded due to its sequential characteristics. Therefore, off-chip memory accesses should be minimized for faster execution. Although previous methods addressed this by pruning unimportant tokens, they fall short in selectively removing tokens with near-zero attention probabilities in each instance. Our method estimates the probability before the softmax function, effectively removing low probability tokens and achieving an 12.1x pruning ratio without fine-tuning. Additionally, we present a hardware design supporting seamless on-demand off-chip access. Our approach shows 2.6x reduced memory accesses, leading to an average 2.3x speedup and a 2.4x energy efficiency. © 2024 Copyright is held by the owner/author(s). Publication rights licensed to ACM.

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Imbalanced Inter Shaft Bearing Fault Diagnosis Based on SAGAN-DANN 15

Imbalanced Inter Shaft Bearing Fault Diagnosis Based on SAGA...

引用

15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Lin, Zheng Li, Xiyi Tian, Jing Xiao, Yuanhang Wang, Jingdi Guo, Weijun Key Lab of Advanced Measurement and Test Technology for Aviation Propulsion System Liaoning Province Shenyang China

ISBN: (纸本)9798350354010

In the actual operation of aircraft engines, the early fault diagnosis of inter shaft bearings is extremely challenging due to their complex and variable working conditions and the difficulty in collecting sufficient vibration signals in advance. To address this issue, a cross-domain fault diagnosis model for inter shaft bearings based on small samples is proposed. This model first utilizes the Self-Attention Generative Adversarial Network (SAGAN) to augment limited vibration signals, capturing complex temporal patterns and structures through the self-attention mechanism. Secondly, it employs the Domain Adversarial Neural Network (DANN) to extract domain-invariant features through adversarial training. Finally, an intelligent diagnostic network is used to identify the health status of inter shaft bearings with unknown labels under variable working conditions. Experimental results demonstrate that the proposed method can accurately and effectively achieve cross-domain inter shaft bearing fault diagnosis with limited available samples, and performs excellently in cases of imbalanced source domain samples. This provides a new approach for early fault identification in aircraft engines. © 2024 IEEE.

关键词： Generative adversarial networks

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Experimental Study on Geometry Characteristics of Turbulent Premixed Flames for Natural Gas/Air Mixtures

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Journal of Thermal Science 2025年第1期34卷 268-282页

作者： ZHENG Weilin WANG Qijiao XIAO Huahua CHEN Xiaoxiao XIE Fan ZENG Wen Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System Shenyang Aerospace UniversityShenyang 110136China State Key Laboratory of Fire Science University of science and Technology of ChinaHefei 230027China AVIC Shenyang Aircraft Design and Research Institute Shenyang 110035China

In this study,focusing on the geometry characteristics of spherical expanding flame,the turbulent premixed flames of natural gas/air mixtures were investigated in a fan-stirred turbulent *** effects of initial temperature(T=300-400 K),initial pressure(P=0.1-0.3 MPa),turbulence intensity(u'=1.0-2.7 m/s),oxygen volumetric percentage(φ(O_(2))=15%-21%)and carbon dioxide volumetric percentage(φ(CO_(2))=0-20%)were delved *** flame profile under the Cartesian coordinate system was derived from the schlieren images taken by the high-speed ***,from both macroscopic and microscopic perspectives,the influence of experimental conditions on the flame geometry characteristics was explored through flame front extraction,wavelet decomposition and network *** results demonstrate that for significant flame wrinkling,changes in species concentrations and turbulence intensity have more pronounced effects on the flame wrinkling *** wrinkling of the flame front maintains a certain degree of similarity,as evidenced by the locally concentrated distribution of the angles of the maximum fluctuation *** disturbance energy under large-scale(D6-D8)disturbances exhibits relatively high values with a similar trend,exerting a significant impact on the geometry characteristics of the flame *** peaks of correlation degree are scattered either with the decomposition scale or the development of flame radius,indicating no linear correlation between different detail ***,the probability distribution of node degrees in key wrinkled regions exhibits different trends with that of large-scale wrinkling and disturbance energy,especially with changes in initial *** occurs because the number of key wrinkles varies based on the perturbation's strength or the region's ***,an increase in the fluctuation frequency of the flame's local radius may not necessarily lead to an increase in the number of key folded regions.

关键词： geometry characteristics large-scale wrinkling wavelet decomposition network topology fan-stirred turbulent combustor

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Fretting Wear Characteristics of Nuclear Fuel Cladding in High-Temperature Pressurized Water

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 326-338页

作者： Jun Wang Haojie Li Zhengyang Li Yujie Lei Quanyao Ren Yongjun Jiao Zhenbing Cai Key Lab of Advanced Technologies of Materials Tribology Research InstituteSouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

In pressurized water reactor(PWR),fretting wear is one of the main causes of fuel assembly ***,the operation condition of cladding is complex and harsh.A unique fretting damage test equipment was developed and tested to simulate the fretting damage evolution process of cladding in the PWR *** can simulate the fretting wear experiment of PWR under different temperatures(maximum temperature is 350℃),displacement amplitude,vibration frequency,and normal *** fretting wear behavior of Zr-4 alloy under different temperature environments was *** addition,the evolution of wear scar morphology,profile,and wear volume was studied using an optical microscope(OM),scanning electron microscopy(SEM),and a 3D white light *** show that higher water temperature evidently decreased the cladding wear volume,the wear mechanism of Zr-4 cladding changed from abrasive wear to adhesive wear and the formation of an oxide layer on the wear scar reduced the wear volume and maximum wear depth.

关键词： Fretting wear Cladding High temperature and high pressure Zirconium alloy

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