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横轴掘锚机截割减速系统装配工艺技术研究

煤矿机械 2024年第5期45卷 100-102页

作者：张宏帅高博林西安煤矿机械有限公司西安710200

截割机构是横轴掘锚机的重要组成部分,截割减速系统是其核心部件,装配不到位会产生泄漏等最终导致截割机构失效。截割减速系统的装配一直是横轴掘进机装配的难点问题,针对该问题,以截割减速系统的装配工艺方法为研究对象,提出装配关键点... 详细信息

截割机构是横轴掘锚机的重要组成部分,截割减速系统是其核心部件,装配不到位会产生泄漏等最终导致截割机构失效。截割减速系统的装配一直是横轴掘进机装配的难点问题,针对该问题,以截割减速系统的装配工艺方法为研究对象,提出装配关键点,通过严格控制锥齿轮、轴承、油封等关键点的方法提升装配质量。

关键词：横轴掘锚机截割减速系统装配加载试验

网联环境下驾驶人响应机制——一种交叉路口接近行为定性效应分析与定量驾驶模式提取案例

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机械工程学报 2024年第10期60卷 22-39页

作者：张海伦许庆高博麟王建强李克强清华大学车辆与运载学院北京100084

智能网联技术的发展为交通安全和效率的提升上提供巨大机遇。然而现有研究未能深入阐述网联环境下驾驶人对环境的认知响应机制,缺乏网联环境下驾驶模式定量分析。提出研究交叉路口接近行为过程和响应机制的方法,探索驾驶人在网联环境下... 详细信息

智能网联技术的发展为交通安全和效率的提升上提供巨大机遇。然而现有研究未能深入阐述网联环境下驾驶人对环境的认知响应机制,缺乏网联环境下驾驶模式定量分析。提出研究交叉路口接近行为过程和响应机制的方法,探索驾驶人在网联环境下的交通行为学机理。在驾驶模拟器中设计两种驾驶场景,分别为基准传统环境和对照网联环境,在对照网联环境组中,向驾驶人提供交通灯相位和当前相位状态剩余时间。采集34名驾驶人视觉交互信息、车辆运动学和驾驶人操作行为特征等参数。分析人机交互界面的交互频率和累积时间百分比、首次交互时间和响应时间,以及驾驶人接近交叉路口的行为特征。建立贝叶斯非参数方法结合文本聚类算法的驾驶模式提取模型,实现对驾驶模式定量描述。结果表明,在红灯和绿灯相位下的人机交互特性存在显著差异,首次交互时间和响应时间高度相关,网联环境可以显著提升交叉路口通行效率,改善驾驶行为。所提出的驾驶模型可以有效描述路口接近行为的6种驾驶模式,网联环境可以降低23.7%的加速行为,平稳驾驶概率提升25.0%。

关键词：汽车工程驾驶行为人机交互驾驶模式智能网联汽车

Predictive cruise control for heavy trucks based on slope information under cloud control system

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Journal of Systems Engineering and Electronics 2022年第4期33卷 812-826页

作者： LI Shuyan WAN Keke gao bolin LI Rui WANG Yue LI Keqiang College of Engineering China Agricultural UniversityBeijing 100083China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China

With the advantage of fast calculation and map resources on cloud control system(CCS), cloud-based predictive cruise control(CPCC) for heavy trucks has great potential to improve energy efficiency, which is significant to achieve the goal of national carbon neutrality. However, most investigations focus on the on-board predictive cruise control(PCC) system,lack of research on CPCC architecture under CCS. Besides, the current PCC algorithms have the problems of a single control target and high computational complexity, which hinders the improvement of the control effect. In this paper, a layered architecture based on CCS is proposed to effectively address the realtime computing of CPCC system and the deployment of its algorithm on vehicle-cloud. In addition, based on the dynamic programming principle and the proposed road point segmentation method(RPSM), a PCC algorithm is designed to optimize the speed and gear of heavy trucks with slope information. Simulation results show that the CPCC system can adaptively control vehicle driving through the slope prediction, with fuel-saving rate of 6.17% in comparison with the constant cruise control. Also,compared with other similar algorithms, the PCC algorithm can make the engine operate more in the efficient zone by cooperatively optimizing the gear and speed. Moreover, the RPSM algorithm can reconfigure the road in advance, with a 91% roadpoint reduction rate, significantly reducing algorithm ***, this study has essential research significance for the economic driving of heavy trucks and the promotion of the CPCC system.

关键词： predictive cruise control(PCC) cloud control system(CCS) layered architecture road point segmentation method(RPSM) economic driving

A Review and Outlook on Predictive Cruise Control of Vehicles and Typical Applications Under Cloud Control System

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Machine Intelligence Research 2023年第5期20卷 614-639页

作者： bolin gao Keke Wan Qien Chen Zhou Wang Rui Li Yu Jiang Run Mei Yinghui Luo Keqiang Li School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China College of Engineering China Agricultural UniversityBeijing 100083China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China School of Mechanical and Electrical Engineering Wuhan University of TechnologyWuhan 430070China

With the application of mobile communication technology in the automotive industry,intelligent connected vehicles equipped with communication and sensing devices have been rapidly *** road and traffic information perceived by intelligent vehicles has important potential application value,especially for improving the energy-saving and safe-driving of vehicles as well as the efficient operation of ***,a type of vehicle control technology called predictive cruise control(PCC)has become a hot research *** fully taps the perceived or predicted environmental information to carry out predictive cruise control of vehicles and improves the comprehensive performance of the vehicle-road *** existing reviews focus on the economical driving of vehicles,but few scholars have conducted a comprehensive survey of PCC from theory to the status *** this paper,the methods and advances of PCC technologies are reviewed comprehensively by investigating the global literature,and typical applications under a cloud control system(CCS)are ***,the methodology of PCC is generally *** according to typical scenarios,the PCC-related research is deeply surveyed,including freeway and urban traffic scenarios involving traditional vehicles,new energy vehicles,intelligent vehicles,and multi-vehicle ***,the general architecture and three typical applications of the cloud control system(CCS)on PCC are briefly introduced,and the prospect and future trends of PCC are proposed.

关键词： Predictive cruise control(PCC) cloud control system(CCS) cooperative control efficient operation intelligent connected vehicle.

Phase-engineering modulation of Mn-based oxide cathode for constructing super-stable sodium storage

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Journal of Energy Chemistry 2024年第1期88卷 421-427,I0010页

作者： Quanqing Zhao Ruru Wang Ming gao bolin Liu Jianfeng Jia Haishun Wu Youqi Zhu Chuanbao Cao Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032ShanxiChina Metals and Chemistry Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China Research Center of Materials Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsBeijing Institute of TechnologyBeijing 100081China

The Mn-based oxide cathode with enriched crystal phase structure and component diversity can provide the excellent chemistry structure for Na-ion ***,the broad application prospect is obstructed by the sluggish Na^(+)kinetics and the phase transitions upon ***,we establish the thermodynamically stable phase diagram of various Mn-based oxide composites precisely controlled by sodium content tailoring strategy coupling with co-doping and solid-state *** chemical environment of the P2/P'3 and P2/P3 biphasic composites indicate that the charge compensation mechanism stems from the cooperative contribution of anions and *** from the no phase transition to scavenge the structure strain,P2/P'3 electrode can deliver long cycling stability(capacity retention of 73.8%after 1000 cycles at 10 C)and outstanding rate properties(the discharge capacity of 84.08 mA h g^(-1)at 20 C)than P2/P3 ***,the DFT calculation demonstrates that the introducing novel P'3 phase can significantly regulate the Na^(+)reaction dynamics and modify the local electron configuration of *** effective phase engineering can provide a reference for designing other high-performance electrode materials for Na-ion batteries.

关键词： Sodium ion battery Oxide cathode Phase engineering Phase diagram Na~+kinetic

Optimal Predictive Control for Path Following of a Full Drive-by-Wire Vehicle at Varying Speeds

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 711-721页

作者： Pan SONG bolin gao Shugang XIE Rui FANG china automotive technology and research center Tianjin 300300China

The current research of the global chassis control problem for the full drive-by-wire vehicle focuses on the control allocation （CA） of the four-wheel-distributed trac- tion/braking/steering systems. However, the path following performance and the handling stability of the vehicle can be enhanced a step further by automatically adjusting the vehicle speed to the optimal value. The optimal solution for the combined longitudinal and lateral motion control （MC） problem is given. First, a new variable step-size spatial transformation method is proposed and utilized in the prediction model to derive the dynamics of the vehicle with respect to the road, such that the tracking errors can be explicitly obtained over the prediction horizon at varying speeds. Second, a nonlinear model predictive con- trol （NMPC） algorithm is introduced to handle the non- linear coupling between any two directions of the vehicular planar motion and computes the sequence of the optimal motion states for following the desired path. Third, a hierarchical control structure is proposed to separate the motion controller into a NMPC based path planner and a terminal sliding mode control （TSMC） based path fol- lower. As revealed through off-line simulations, the hier- archical methodology brings nearly 1700% improvement in computational efficiency without loss of control per- formance. Finally, the control algorithm is verified through a hardware in-the-loop simulation system. Double-lane- change （DLC） test results show that by using the optimalpredictive controller, the root-mean-square （RMS） values of the lateral deviations and the orientation errors can be reduced by 41% and 30%, respectively, comparing to those by the optimal preview acceleration （OPA） driver model with the non-preview speed-tracking method. Additionally, the average vehicle speed is increased by 0.26 km/h with the peak sideslip angle suppressed to 1.9~. This research proposes a novel motion controller, which provides the full dri

关键词： Vehicle dynamics Spatial transformationModel predictive control Sliding mode control Automated lane guidance

Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map

Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains

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Journal of Energy Chemistry 2024年第2期89卷 324-335,I0008页

作者： Weiting gao Xuelang gao Qiugen Zhang Aimei Zhu Qinglin Liu Department of Chemical&Biochemical Engineering Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryThe College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 790-784South Korea

Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion *** of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine ***,their electronic effect on the alkaline stability of side chains and membranes is rarely ***,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane *** poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based ***,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and *** results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium *** QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关键词： Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability