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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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Shock-Resistant and Energy-Absorbing Properties of Bionic NiTi Lattice Structure Manufactured by SLM

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Journal of Bionic engineering 2022年第6期19卷 1684-1698页

作者： Zhenglei Yu Renlong Xin Zezhou Xu Luming Sha Lixin Chen Yining Zhu Ping Liang Zhihui Zhang Zhenze Liu Qing Cao College of Communication Engineering Jilin UniversityChangchun130022China Key Laboratory of Engineering Bionics Ministry of EducationJilin UniversityChangchun130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130022China School of Agriculture Yanbian UniversityYanji133002China

Each specific structure of organisms is the best choice under specific *** excellent characteristic structures of these organisms have great application potential in the design and multi-functional optimization of energy-absorbing structures such as vehicle collisions,satellite landings,and military *** this paper,using the principle of structural bionics,using the advantages of the honeycomb structure and the light weight and high strength of beetle elytra,four bionic lattice structures are studied:CH,ZPRH,SCH and *** NiTi shape memory alloy,a unique material as the base material,samples are prepared using selective laser melting(SLM)*** comparing the test results of the quasi-static compression test with the results of the numerical simulation,it is found that compared with the other three bionic lattice structures,the SCH structure has the best energy absorption effect in the effective stroke in the test,and the specific energy absorption can reach 6.32 J/***,SCH,and IBE structures not only have good and stable deformation behavior,but also have excellent impact resistance and shape memory *** design of these structures provides a reference for the design of anti-shock cushioning structures with self-recovery functions in the future.

关键词： engineering bionics Bionic structural design Additive manufacturing Quasi-static compression Numerical simulation Shape memory effect

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Real-time energy-efficient anticipative driving control of connected and automated hybrid electric vehicles

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control Theory and Technology 2022年第2期20卷 210-220页

作者： Shiying Dong Hong Chen Lulu Guo Qifang Liu Bingzhao Gao State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025JilinChina Department of Control Science and Engineering Jilin UniversityChangchun 130025JilinChina Department of Control Science and Engineering Tongji UniversityShanghai 200092China Clean Energy Automotive Engineering Center Tongji UniversityShanghai 200092China

In this paper,we propose a real-time energy-efficient anticipative driving control strategy for connected and automated hybrid electric vehicles(HEVs).Considering the inherent complexities brought about by the velocity profile optimization and energy management control,a hierarchical control architecture in the model predictive control(MPC)framework is developed for real-time *** the higher level controller,a novel velocity optimization problem is proposed to realize safe and energy-efficient anticipative *** real-time control actions are derived through a computationally efficient *** the lower level controller,an explicit solution of the optimal torque split ratio and gear shift schedule is introduced for following the optimal velocity profile obtained from the higher level *** comparative simulation results demonstrate that the proposed strategy can achieve approximately 13%fuel consumption saving compared with a benchmark strategy.

关键词： Connected and automated vehicle Hybrid electric vehicle Anticipative driving Hierarchical control architecture Real-time solution

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High Robustness Current Measurement Error Compensation of SPMSM Drives Based on Discrete Fourier Transform

High Robustness Current Measurement Error Compensation of SP...

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China International Electrical and Energy Conference (CIEEC)

作者： Jiang Long Yunfeng Hu Xun Gong State Key Laboratory of Automotive Simulation and Control College of Telecommunications Engineering Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control College of Artificial Intelligence Jilin University Changchun China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

Accurate measurement of current feedback is an important prerequisite for high performance permanent magnet synchronous motor (PMSM) drive systems. For the actual control system, due to the thermal drift, aging, nonlinearity and some other factors of the current sensors and the corresponding conditioning circuits, current measurement error will occur and correspondingly will result in torque and speed ripples. To overcome this issue, an online current measurement error compensation (CMEC) method for PMSM drive system is proposed in this paper. Firstly, the influence of different kinds of current measurement errors, the offset error and scaling error, is analyzed from the perspective of open loop control. Secondly, a Discrete Fourier Transform (DFT) based CMEC method is proposed. Finally, the effectiveness of the proposed method is validated on a 1kW commercialized servo motor test rig, results show that the proposed method can reduce 80% of the current ripple.

关键词： Torque Thermal factors Current measurement Discrete Fourier transforms Error compensation Thermal sensors Sensor systems

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Spatial-Temporal Graph Attention Network for Pedestrian Trajectory Prediction 6

Spatial-Temporal Graph Attention Network for Pedestrian Traj...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Liu, Yanran Guo, Hongyan Meng, Qingyu Li, Jialin Jilin University The State Key Laboratory of Automotive Simulation and Control The Department of Control Science and Engineering Changchun China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Ensuring pedestrians who are vulnerable road users safety is the prerequisite for the widespread application of autonomous vehicles. Accurate prediction of pedestrian trajectory can effectively reduce the occurrence of traffic accidents. Therefore, we propose an encoder-decoder model framework using a Spatiai-Temporal Graph Attention Network to predict future trajectory. The movement of pedestrians are not only related to their own subjective will, but also affected by their neighbors. We introduce temporal attention mechanism to get the importance of historical trajectories at different moments and use spatial attention mechanism based on Graph Attention Network(GAT) to give neighbors different attention to obtain spatial correlation. The experiments are constructed on the ETH and UCY datasets. The results confirm the efficacy of the proposed method and indicate that our model is superior to advanced models in most instances. © 2022 IEEE.

关键词： Trajectories

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Temporal-Aware Convolutional Network for First-Person View Pedestrian Trajectory Prediction 8

Temporal-Aware Convolutional Network for First-Person View P...

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8th CAA International Conference on Vehicular control and Intelligence, CVCI 2024

作者： Liu, Yanran Meng, Qingyu Xie, Hongnan Guo, Hongyan The College of Communication Engineering Jilin University National Key Laboratory of Automotive Chassis Integration and Bionics Changchun China Jilin University National Key Laboratory of Automotive Chassis Integration and Bionics The Department of Control Science and Engineering Changchun China

ISBN: (纸本)9798331504892

Pedestrian trajectory prediction is one of the key technologies to realize safe and reliable autonomous driving systems. Compared with the traditional bird's-eye view dataset, pedestrian trajectory prediction from the first view can provide direct visual information about pedestrians, which has higher application value. In this study, a multi-modal pedestrian trajectory prediction model with time-aware convolutional network (TACN) is proposed. By transforming the raw trajectory data into a multivariate input format, the model can more precisely capture both the pedestrians' location information and their dynamic changes. At the same time, the designed time-aware convolutional network can extract multi-time scale feature, and effectively deal with the immediancy and burstiness of pedestrian behavior. To deal with the uncertainty of future trajectories, we employ a conditional variational autoencoder (CVAE) to implement multimodal trajectory prediction and generate multiple possible future trajectories. Experimental results demonstrate the superiority of our approach. © 2024 IEEE.

关键词： Prediction models

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Numerical simulation and experimental comparison of antagonistic shape memory alloy linear actuator for automotive applications 8

Numerical simulation and experimental comparison of antagoni...

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2022 8th International Conference on Mechanical engineering, Materials and Automation Technology, MMEAT 2022

作者： Shen, Chuanliang Yue, Yubing Hu, Yibo Yu, Jing State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

This paper introduces several commonly used constitutive models of SMA materials, expounds the relationship between material temperature, stress and strain from the perspective of one-dimensional model, and establishes the simulation model of reciprocating motion of SMA actuator based on the material parameters obtained from quasi-static mechanical property experiments in the previous paper. A double wire pull SMA actuator is designed and a prototype is made. The output displacement data obtained from the experiment is compared with the established simulation model to prove the accuracy of the simulation process. © Published under licence by IOP Publishing Ltd.

关键词： Linear actuators

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control of Vehicle Beyond the Stability Limits 5

Control of Vehicle Beyond the Stability Limits

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5th IEEE International Conference on Automation, Electronics and Electrical engineering, AUTEEE 2022

作者： Wang, Pengyu Ji, Yipei Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China

ISBN: (纸本)9781665471978

A trajectory tracking controller of a drifting vehicle is developed in this paper. To accurately achieve path tracking, a control law is derived from expert driver. The synthetic vehicle course angle and yaw rate is derived. A front tire simplifying assumption and wheel-speed control at rear tires is adopted in the controller. simulation demonstrates good tracking of a trajectory with varying curvature. © 2022 IEEE.

关键词： Autonomous vehicles

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Aerodynamic Performance of Two-Vehicle Platooning of DrivAer Model 6th

Aerodynamic Performance of Two-Vehicle Platooning of DrivAer...

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6th Symposium on Fluid-Structure-Sound Interactions and control, FSSIC 2023

作者： Li, Jinji Tong, Zhongqing Zhang, Yingchao Chen, Tao State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China FAW Jiefang Commercial Vehicle Development Institute Changchun130013 China

ISBN: (纸本)9789819762101

With the gradual maturity of intelligent driving technology, driving in platoon is easy to achieve, which might benefit for energy saving. Hence, it is urgent to discover the mechanism of aerodynamic in platoon condition. Aerodynamic drag and mechanism in two-vehicle platooning in different spacing are studied by numerical method with the DrivAer model. As spacing grows, three configuration models share the same law, but the leading and trailing car appear the opposite drag change compared with that in the isolated condition. Pressure changes of some crucial parts and wake field are analyzed in detail. Some new styles of vehicle shape might be needed for driving in platoon. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Aerodynamic drag

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Shift schedule design of thirty-two-speed binary logic transmission based on man-vehicle-road System 6

Shift schedule design of thirty-two-speed binary logic trans...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Zhou, Lanqi Zeng, Xiaohua Liang, Weizhi Yang, Dongpo Song, Dafeng Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Binary logic transmission (BLT) is an emerging automatic transmission. Because of its high transmission efficiency, high power density, strong load capacity and compact structure, it has been widely used in military vehicles and other special vehicles in recent years. The traditional shift schedules will lead to frequent shifts of the thirty-two-speed BLT and cumbersome solutions for the jump points. Therefore, referring to the speed ratio adjustment strategy of the continuously variable transmission, the paper proposes a dynamic speed ratio adjustment strategy and an economic speed ratio adjustment strategy suitable for the thirty-two-speed BLT, which can ensure the power and economy of vehicle and achieve reasonable gear jumping. At the same time, considering the influence of different road conditions on the shift schedule, the paper introduces the road gradient and vehicle mass to modify the above shift schedule, and designs a thirty-two-speed BLT shift schedule based on the man-vehicle-road system. Based on the physical simulation platform of thirty-two-speed BLT, the proposed shift schedule is simulated and verified. The results show that the shift schedule can meet the demand of vehicle power performance and economic performance, solve the problem of frequent shifts, and significantly enhance the vehicle climbing performance, give full play to the backup power of the vehicle, and effectively improve the working condition adaptability of the thirty-two-speed BLT. © 2022 IEEE.

关键词： Roads and streets

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