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2023 9th International Conference on Applied Materials and Manufacturing Technology, ICAMMT 2023

作者： Shen, Chuanliang Zhan, Jincheng Deng, Yifei Gao, Yaohui State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China College of Automotive Engineering Jilin University Changchun China

To overcome the problems of the low power/weight ratio of traditional servo motors, complex transmission systems, and large space occupied by hydraulic drive systems, this paper designs a bidirectional torsional actuator using the shape memory effect of Ti-Ni shape memory alloy (SMA) wire, which aims to realize the folding and unfolding of the wings of flying cars. The model of the designed actuator was established and the theoretical calculation was analyzed, based on which the experimental verification was carried out. It is found that when the heating current is 1.6 A, the mechanism can take into account the economy under the premise of meeting a certain folding speed. When the pre-stretching amount of SMA wire is 3%, the residual strain corresponding to the wire is small, about 0.577%, and it can provide driving torque and torsion angle to meet the design requirements of the actuator. This verifies the feasibility of the actuator and obtains the driving characteristics of the actuator. Finally, the shortcomings and improvement measures of the actuator are analyzed briefly. © Published under licence by IOP Publishing Ltd.

关键词： Titanium alloys

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MPC-based strategy for longitudinal and lateral stabilization of a vehicle under extreme conditions

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Science China(Information Sciences) 2022年第7期65卷 263-264页

作者： Zihan LI Ping WANG Chaojie ZHU Yunfeng HU Hong CHEN State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering School of Communication Engineering Jilin University Clean Energy Automotive Engineering Center Tongji University

Dear editor, In recent decades, active safety-control systems have been developed to assist drivers. Wheel slip ratio, yaw rate, and side-slip angle are commonly considered as the control indices of longitudinal and lateral vehicle stabilities [1]. However, if systems that only contain vehicle dynamics in longitudinal or lateral directions work simultaneously, the system objectives may conflict.

关键词： model predictive control stability control combined-slip characteristics LuGre tire model extreme driving conditions

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Air-Fuel Ratio control of SI Engine Based on Feedback Linearization 7

Air-Fuel Ratio Control of SI Engine Based on Feedback Linear...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Liu, Xin Sun, Shaolong Li, Xinfang Gao, Jinwu State Key Laboratory of Automotive Simulation and Control Department of Control Science and Engineering Jilin University Changchun China

ISBN: (纸本)9798350340488

Vehicle engines often operate under various operating conditions, and their air fuel ratio (AFR) system has characteristics of nonlinearity, time-varying, and time delay, which can bring difficulties to system modeling and affect the control effect of the air fuel ratio. Therefore, studying control strategies that consider the characteristics of the air fuel ratio system is of great significance. Firstly, the engine air fuel ratio system is modeled, and a feedback linearization control method is used to design an air fuel ratio controller to ensure that the engine's air fuel ratio is stable at the target value. Finally, the effectiveness of the modeling of the air fuel ratio system and the air fuel ratio controller was verified through experiments. © 2023 IEEE.

关键词： AFR control extended state observer feedback linearization control wet wall effect

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Semantic Segmentation-Inspired Prediction of Pavement Adhesion Coefficient 7

Semantic Segmentation-Inspired Prediction of Pavement Adhesi...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Guo, Hongyan Wan, Juncheng Meng, Qingyu Liu, Yanran State Key Laboratory of Automotive Simulation and Control The College of Communication Engineering Jilin University Changchun China

ISBN: (纸本)9798350340488

Accurate prediction of the adhesion coefficient parameters of the road ahead is critical to the driving safety of intelligent driving vehicles, however, the current stage of raw image-based methods are difficult to achieve high-precision and reliable prediction due to the complexity of the elements within the scene. To this end, a road adhesion coefficient recognition algorithm inspired by semantic segmentation is proposed. The method designs a sequential prediction algorithm structure that includes semantic segmentation, road surface extraction, road surface recognition, and adhesion coefficient mapping. Additionally, the method introduces the spatial attention mechanism and channel attention mechanism separately into the semantic segmentation network and road surface classification network, effectively enhancing the accuracy and real-time performance of the adhesion coefficient prediction algorithm. Experimental results illustrate that this real-time adhesion coefficient prediction algorithm achieves good performance in maintaining accuracy, real-time capability, and robustness. It can accurately and rapidly predict road surface adhesion information in driving scenarios. © 2023 IEEE.

关键词： Attention mechanism Real-time performance Road surface adhesion coefficient Semantic segmentation

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Mechanical Characteristics Analysis of 3D-printing Novel Chiral Honeycomb Array Structures Based on Functional Principle and Constitutive Relationship

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Journal of Bionic Engineering 2023年第5期20卷 1917-1929页

作者： Ruiyao Liu Guofeng Yao Zezhou Xu Xue Guo Jianyong Li Zhenglei Yu Ping Liang Zhihui Zhang Chunyang Han Department of Mechanics School of Mechanical and Aerospace EngineeringJilin UniversityChangchun130022China Key Laboratory of Bionic Engineering of Ministry of Education Jilin UniversityChangchun130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130022China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun130022China

Four novel chiral honeycomb structures inspired by the biological arrangement shape are *** functional principle is raised to solve the large deformation of bio-inspired structures and the structural constitutive model is proposed to explain the quasi-static mechanical properties of chiral honeycomb array structures and honeycomb *** and experiment results verify the accuracy of theoretical analysis results and the errors are all within 15%.In structural mechanical properties,Equidimensional Chiral Honeycomb Array Structure(ECHS)has excellent mechanical *** ECHS,Small-sized Column Chiral Honeycomb Array Structure(SCHCS)has the best *** bearing capacity,specific energy absorption,and specific strength of SCHCS are more than twice as much as the others in this *** chiral honeycomb array structure has the best mechanical properties at a certain *** the structural design,the optimal size model should be obtained first in combination with the optimization algorithm for the protection design.

关键词： Bionic Gradient sizes Function principle Constitutive model The global simulated annealing optimization algorithm

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Simultaneous refinement of α-Mg grains and β-Mg_(17)Al_(12) in Mg-Al based alloys via heterogeneous nucleation on Al_(8)Mn_(4)Sm

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Journal of Magnesium and Alloys 2023年第1期11卷 348-360页

作者： Jun-Chen Chen Mei-Xuan Li Zhi-Yang Yu Zhao-Yuan Meng Cheng Wang Zhi-Zheng Yang Hui-Yuan Wang State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012PR China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Jilin UniversityNanling CampusNo.5988 Renmin StreetChangchun 130025PR China International Center of Future Science Jilin UniversityChangchun 130012PR China

Due to the significant differences in the formation temperature and crystal structure between the primaryα-Mg and eutecticβ-Mg_(17)Al_(12),it is a great challenge to achieve simultaneous refinement of the primary and eutectic phases in Mg-Al based alloys via heterogeneous ***,we found that theα-Mg andβ-Mg_(17)Al_(12) in the AZ80 alloy can be simultaneously refined after 0.2 wt.%Sm addition,with the grain size decreasing from∼217±15μm to∼170±10μm and theβ-Mg_(17)Al_(12) morphology changing from a typical continuous network to a nod-like or spherical *** simultaneous refinement mechanism is investigated through solidification simulation,transmission electron microscopy(TEM),and differential thermal analysis(DTA).In the AZ80-0.2Sm alloy,many Al8Mn4Sm particles can be observed near the center of theα-Mg grains or inside theβ-Mg_(17)Al_(12).Crystallographic calculations further reveal that the Al8Mn4Sm has good crystallographic matching with both theα-Mg andβ-Mg_(17)Al_(12),so it possesses the potency to serve as heterogeneous nucleation sites for both *** promoted heterogeneous nucleation on the Al8Mn4Sm decreases the undercooling required by the nucleation of the primary and eutectic phases,which enhances the heterogeneous nucleation rate,thus causing the simultaneous refinement of theα-Mg andβ-Mg_(17)Al_(12).The orientation relationships between the Al8Mn4Sm and Mg/Mg_(17)Al_(12) are identified,which are[1210]_(Mg)//[010]_(Al8Mn4Sm),(1010)_(Mg)//(301)_(Al8Mn4Sm) and[112]_(Mg_(17)Al_(12))//[010]_(Al8Mn4Sm),(110)_(Mg_(17)Al_(12))//(301)_(Al8Mn4Sm),***,the refinement of theβ-Mg_(17)Al_(12) accelerates its dissolution during the solution treatment,which is beneficial for cost saving in industrial *** Al8Mn4RE compounds such as Al8Mn4Y might have the same positive effect on the simultaneous refinement due to the similar physicochemical properties of rare earth *** work not only proves the po

关键词： Magnesium alloys Microstructure refinement Primaryα-Mg Eutecticβ-Mg_(17)Al_(12) Rare earth Heterogeneous nucleation

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Target Vehicle Selection Algorithm for Adaptive Cruise control Based on Lane-changing Intention of Preceding Vehicle

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 390-407页

作者： Jun Yao Guoying Chen Zhenhai Gao State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China

To improve the ride comfort and safety of a traditional adaptive cruise control(ACC)system when the preceding vehicle changes lanes,it proposes a target vehicle selection algorithm based on the prediction of the lane-changing intention for the preceding ***,the Next Generation simulation dataset is used to train a lane-changing intention prediction algorithm based on a sliding window support vector machine,and the lane-changing intention of the preceding vehicle in the current lane is identified by lateral position ***,according to the lane-changing intention and collision threat of the preceding vehicle,the target vehicle selection algorithm is studied under three different conditions:safe lane-changing,dangerous lane-changing,and lane-changing ***,the effectiveness of the proposed algorithm is verified in a co-simulation *** simulation results show that the target vehicle selection algorithm can ensure the smooth transfer of the target vehicle and effectively reduce the longitudinal acceleration fluctuation of the subject vehicle when the preceding vehicle changes lanes safely or cancels their lane change *** the case of a dangerous lane change,the target vehicle selection algorithm proposed in this paper can respond more rapidly to a dangerous lane change than the target vehicle selection method of the traditional ACC system;thus,it can effectively avoid collisions and improve the safety of the subject vehicle.

关键词： Lane-changing intention Target vehicle selection Support vector machine Adaptive cruise control

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Time delay recursive neural network-based direct adaptive control for a piezo-actuated stage

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Science China(Technological Sciences) 2023年第5期66卷 1397-1407页

作者： WANG YiFan ZHOU MiaoLei SHEN ChuanLiang CAO WenJing HUANG XiaoLiang Department of Control Science and Engineering Jilin UniversityChangchun130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130022China Department of Engineering and Applied Sciences Sophia UniversityTokyo102-8554Japan Department of Electrical Engineering Chalmers University of TechnologyGothenburg41296Sweden

Piezo-actuated stage is a core component in micro-nano manufacturing ***,the inherent nonlinearity,such as rate-dependent hysteresis,in the piezo-actuated stage severely impacts its tracking *** study proposes a direct adaptive control(DAC)method to realize high precision *** proposed controller is designed by a time delay recursive neural *** with those existing DAC methods designed under the general Lipschitz condition,the proposed control method can be easily generalized to the actual systems,which have hysteresis ***,a hopfield neural network(HNN)estimator is proposed to adjust the parameters of the proposed controller ***,a modular model consisting of linear submodel,hysteresis submodel,and lumped uncertainties is established based on the HNN estimator to describe the piezoactuated stage in this ***,the performance of the HNN estimator can be exhibited visually through the modeling *** proposed control method eradicates the adverse effects on the control performance arising from the inaccuracy in establishing the offline model and improves the capability to suppress the influence of hysteresis on the tracking accuracy of piezo-actuated stage in comparison with the conventional DAC *** stability of the control system is ***,a series of comparison experiments with a dual neural networks-based data driven adaptive controller are carried out to demonstrate the superiority of the proposed controller.

关键词： piezo-actuated stage direct adaptive control time delay recursive neural network hopfield neural network estimator

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Ultrathin origami accordion-like structure of vacancy-rich graphitized carbon nitride for enhancing CO_(2) photoreduction

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Carbon Energy 2023年第4期5卷 94-104页

作者： Guangri Jia Zhongxu Wang Ming Gong Ying Wang Lu Hua Li Yilong Dong Lulu Liu Lei Zhang Jingxiang Zhao Weitao Zheng Xiaoqiang Cui State Key Laboratory of Automotive Simulation and Control Key Laboratory of Automobile Materials of MOESchool of Materials Science and EngineeringJilin UniversityChangchunJilinChina Key Laboratory of Photonic and Electronic Bandgap Materials Ministry of EducationCollege of Chemistry and Chemical EngineeringHarbin Normal UniversityHarbinHeilongjiangChina Institute for Frontier Materials Deakin UniversityWaurn PondsVictoriaAustralia College of Chemistry Jilin UniversityChangchunJilinChina

Retaining the ultrathin structure of two-dimensional materials is very important for stabilizing their catalytic ***,aggregation and restacking are unavoidable,to some extent,due to the van der Waals interlayer interaction of two-dimensional ***,we address this challenge by preparing an origami accordion structure of ultrathin twodimensional graphitized carbon nitride(oa-C_(3)N_(4))with rich *** novel structured oa-C_(3)N_(4) shows exceptional photocatalytic activity for the CO_(2) reduction reaction,which is 8.1 times that of the pristine C_(3)N_(4).The unique structure not only prevents restacking but also increases light harvesting and the density of vacancy defects,which leads to modification of the electronic structure,regulation of the CO_(2) adsorption energy,and a decrease in the energy barrier of the carbon dioxide to carboxylic acid intermediate *** study provides a new avenue for the development of stable highperformance two-dimensional catalytic materials.

关键词： C_(3)N_(4) CO_(2)photoreduction molecular modification photocatalysts solar energy conversion two-dimensional materials

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RECURRENCE AND CHAOS

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2024年第4期86卷 77-90页

作者： Wang, Nan Jiao, Lixin Wang, Lidong Shi, Shaoyun School of Mathematics Jilin University Changchun130012 China School of Disciplinary Basics and Applied Statistics Zhuhai College of Science and Technology Zhuhai519041 China School of Mathematics and State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130012 China

Assume that (Σ2, ρ) is a one sided symbolic space, σ is a sub-shift on Σ2. In this paper, we proved that there exists T ⊂ P QW (σ) ⊂ Σ2 such that σ |T is R − T chaos, Martelli chaos, distributional chaos, weakly mixing, Xiong-chaos and distributional chaos in a sequence. As an application, we prove that chaos occurs on recurrent sets in exchange economic systems. © 2024, Politechnica university of Bucharest. All rights reserved.

关键词： Quantum chaos

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