[an error occurred while processing this directive]
Journal of Jiangsu University(Natural Science Eidtion)
Home   |   About Journal   |   Editorial Board   |   Subscriptions   |   Instruction   |   Contacts Us   |   中文
 
　

Office Online

 　
　  Author Center
　  Peer Review
　  Editor Work
　  Office Work
　  Editor-in-chief
　

Journal Online

 　
　  Forthcoming Articles
　  Current Issue
　  Next Issue
　  Archive
　  Read Articles
　  Download Articles
　  Email Alert
　  
Quick Search  
  Advanced Search
Journal of Jiangsu University(Natural Science Eidtion)
 
2023 Vol.44 Issue.6
Published 2023-11-10
621 Dynamic lane-changing trajectory planning of intelligent vehicle based on virtual safety boundary
JIANG Haobin, HONG Yangke, FENG Zhangqi, PI Jian, WEI Qizhi
Due to the variability and complexity of the traffic environment, a dynamic lane-changing trajectory planning algorithm based on virtual safety boundary was proposed to meet the requirements of safety and comfort in lane-changing process. Considering the coupling of lane change end time and longitudinal position, the quartic and quintic mixed polynomial lane-changing trajectory algorithms were used for vertical and horizontal planning, and the lane change time and the longitudinal speed range were respectively determined to obtain the candidate lane-changing trajectory. The vehicle motion state constraint and the anti-collision constraint based on virtual safety boundary were designed, and the cost functions of vehicle lane-changing safety, comfort and car following benefit were constructed. The weight coefficients of each cost function were dynamically adjusted based on the threshold of safety cost function, and the candidate lane-changing trajectory was optimized by fmincon function. Considering the effect of the surrounding vehicle motion state change on the lane-changing process, the vehicle system circularly called the lane-changing trajectory planning module to update the lane-changing trajectory in real time until the vehicle reached the target position. The results show that for different lane-changing conditions, by the intelligent vehicle dynamic lane-changing trajectory planning algorithm based on virtual safety boundary, the collision with surrounding vehicles can be effectively avoided in the lane-changing process, and the safety of intelligent vehicle lane-changing process is ensured.
2023 Vol. 44 (6): 621-629 [Abstract] ( 34 ) [HTML 1KB] [ PDF 2488KB] ( 556 )
630 Modeling and analysis of car purchase decision considering vehicle ownership heterogeneity
JING Peng， WANG Xingyue， PAN Kewen， ZHA Ye， SHAO Danning
To reveal the car purchase decision-making mechanism of different vehicle ownership groups during the new normal of COVID-19, a behavioral theoretical framework integrating the theory of planned behavior, the protection motivation theory and the psychological reactance theory was constructed. The partial least squares structural equation model was used to carry out decision prediction and difference analysis of heterogeneous groups of vehicle ownership. The results show that the prediction abilities of the model of the car-owning group and car-free group are 58.9% and 70.1%, respectively. There are significant differences in the car purchase decision-making mechanism of different car ownership. The purchase intention of the car-free group is significantly higher than that of the car-owning group. The car-free group comprehensively considers perceived security, perceived vulnerability, health value, cost factors and conditional value during purchasing cars, while the car-owning group mainly considers perceived vulnerability, reactance and conditional value.
2023 Vol. 44 (6): 630-637 [Abstract] ( 26 ) [HTML 1KB] [ PDF 1031KB] ( 344 )
638 Battery SOC estimation based on BASOA-IEKF fusion algorithm
YE Lihua1, HE Zhou1, SHI Yefan2, CHEN Yaoyang1, CHENG Xing1, SHI Aiping1
Standard extended Kalman filter (EKF) is currently and commonly used algorithm for estimating the state of charge (SOC) of batteries. However, the accuracy of battery SOC estimation is compromised due to the linearization errors and the dependence on noise matrices in the system. To address the issue, a fusion filtering algorithm based on boundary adaptive seeker optimization algorithm and iterated extended Kalman filter（BASOA-IEKF） was proposed to improve the SOC estimation accuracy by iteratively updating the state estimates and intelligently optimizing the system noise matrix. The static and dynamic simulation results show that under static conditions, the maximum estimation error of SOC is 3.74%. Under hybrid pulse power characterization（HPPC） conditions, the estimation error is less than 3.00%, while under urban dynamometer driving schedule（UDDS） conditions, it is less than 2.50%. Compared to the single IEKF algorithm, the BASOA-IEKF algorithm achieves higher accuracy in SOC estimation with smaller fluctuations in the SOC error curve after convergence and demonstrates better stability and global robustness.
2023 Vol. 44 (6): 638-643 [Abstract] ( 24 ) [HTML 1KB] [ PDF 1031KB] ( 391 )
644 Vehicle control strategy of anti-cut-ins through changing safety distance based on three types of driver
JIANG Hao， ZHAO Youqun， LIN Fen， ZHANG Wenxin
To prevent the dangerous driving behavior of cut-ins inserting into the gap between the ego car and the lead car, a vehicle control strategy for accelerating was proposed. According to the following safety distance model, considering the following characteristics of time headway and parking distance, a following safety distance model and an anti-cut-ins safety distance model were established based on three types of driver. A vehicle speed controller based on the variable safety distance control strategy was established by the Sigmoid function. When another vehicle was detected to cut-in, the anti-cut-ins safety distance model was selected, otherwise the following safety distance model was selected. The MATLAB/Simulink and CarSim co-simulation platform was used to carry out experiments. The results show that the vehicle control strategy based on three types of driver′s variable safety distance and anti-cut-ins is feasible.
2023 Vol. 44 (6): 644-650 [Abstract] ( 26 ) [HTML 1KB] [ PDF 1939KB] ( 378 )
651 Pore network simulation of two-phase transport characteristics in compressed gas diffusion layer of PEMEC
CHEN Li1,2, LUO Maji1,2, LIU Cheng1,2
Based on Toray 090 carbon paper, the gas diffusion layers in the proton exchange membrane electrolysis cell under different compression levels were randomly reconstructed,and the breakthrough pressure, capillary pressure curve, relative permeability and relative diffusivity of hydrogen in gas diffusion layer(GDL) were calculated by the three-dimensional pore network model. The mass transfer relationship of hydrogen in the cathode GDL was also investigated. The results show that the hydrogen mass transfer relation reconstructed from the pore network simulation data is more suitable for describing the hydrogen transport in the cathode GDL. The mass transfer performance parameters of relative permeability and relative diffusivity of hydrogen in GDL are almost unchanged under different compression levels. With the increasing of compression level, the resistance of hydrogen transmission in GDL is increased, which leads to the increase of produced hydrogen pressure at the membrane interface,and hydrogen is more likely to leak from the cathode transmembrane to the anode.
2023 Vol. 44 (6): 651-656 [Abstract] ( 23 ) [HTML 1KB] [ PDF 2125KB] ( 339 )
657 Path tracking and anti-rollover control of high gap four-wheel independent drive sprayer
LIU Guohai, ZHANG He, ZHANG Duo, SHEN Yue, WANG Zijie
The path tracking control and the anti-rollover control were respectively constructed based on the kinematic model of sprayer. In the upper layer， the model predictive control (MPC) was used to output the desired steering angle and speed of the sprayer based on the current state of the sprayer and the desired path to achieve trajectory tracking control. The lower layer controller was used to determine whether the vehicle state produced rollover by introducing lateral load transfer rate (LTR) as rollover measure index, and the LTR was controlled by introducing a fuzzy controller to achieve the control of lateral acceleration and stabilize the LTR at a certain threshold value. The sprayer was controlled with better control accuracy and driving stability in the process of trajectory tracking and was ensured without rollover. The joint simulation results of ADAMS/MATLAB show that by anti-rollover control， the LTR of the sprayer can be controlled within 0.5 under complex road conditions with high trajectory tracking accuracy and improved safety.
2023 Vol. 44 (6): 657-664 [Abstract] ( 24 ) [HTML 1KB] [ PDF 2452KB] ( 345 )
665 Obstacle-avoiding stability control method of tractor in tea plantation based on Bezier curve optimization
LIANG Jun1, REN Minghui1, CHEN Long1, XU Yonglong1,2, CHEN Fengqiang3, DU Wanbing3
To solve the safety problems of tractors in tea plantation (TTP) in obstacle avoidance turning with rollover and overturn, an obstacle avoidance stable path control method was proposed based on Bezier curve optimization. The kinematics analysis was carried out according to operation scene and operation stability, and the safety operation characteristics of TTP were systematically analyzed. The obstacle avoidance path planning system framework and the Bezier curve path optimization method were designed. The path fitted by this method had the advantages of smooth path, continuous curvature with the same curvature at the beginning and end. TTP model and ramp obstacle avoidance environment model were established on CarSim simulation platform to verify and analyze two important operation stability parameters of yaw velocity and sideslip angle. The results show that TTP has good running stability when the running speed is less than the steering limit speed under the path fitted by Bezier curve. When the steering speed exceeds 65.1% of the steering limit speed, the overshooting rates of yaw velocity and the centroid sideslip angle reach 50.3% and 78.6%, respectively. At the same time, with the increasing of slope, TTP stability can be further deteriorated even if the speed is kept below the limit speed. When the slope angle is increased by 10°, the overshoot rates of yaw velocity and the centroid sideslip angle reach 32.8% and 14.5% on average，respectively.
2023 Vol. 44 (6): 665-671 [Abstract] ( 23 ) [HTML 1KB] [ PDF 1967KB] ( 358 )
672 Design and implementation of a band expansion method for Doherty power amplifier
XIONG Dean1,2， LIU Chengguo1,2， HUANG Lifeng2,3,4， CAO Lifeng1,2， CHENG Runsheng1,2
5G and beyond communication systems need wider bandwidth compared to 4G communication system. To break through the narrow band limitation of conventional Doherty power amplifier, a method was proposed to broaden the bandwidth. Two impedance matching was used to design output matching circuit of main power amplifier properly， and the post-matching structure was used to optimize the power synthesis network. A simple and wideband circuit structure of Doherty power amplifier was formed. To verify the proposed method, the 3.3-3.7 GHz Doherty power amplifier with GaN transistors CGH40010 was designed and measured. The measurement results show that the designed Doherty power amplifier has bandwidth ranging from 3.3 to 3.7 GHz with saturated power of 43.2-44.5 dBm and saturated gain of 8-11 dB. The drain efficiencies at saturation and 6 dB output power back-off level are 67%-76% and 42%-56%， respectively.
2023 Vol. 44 (6): 672-679 [Abstract] ( 24 ) [HTML 1KB] [ PDF 1875KB] ( 329 )
680 Cellular automata traffic flow model integrating multi-source information
HUANG Chen, TU Yuan, WANG Yu, SUN Xiaoqiang
To solve the problem of intelligent connected vehicles being prone to traffic accidents due to environmental weather conditions, a cellular automata traffic flow model integrating multi-source information was proposed. The neural networks were utilized to fuse multi-source information flows and high-precision map data in cloud environments and to achieve dynamic map updates and provide more accurate path planning for autonomous vehicles for effectively avoiding traffic accidents. Based on the multi-source information model, a two-lane traffic flow cellular automata model was constructed and compared with the manual driving model to demonstrate the superiority of the proposed model in terms of safety distance model, following rules and lane changing rules. The simulation was completed by MATLAB. The results show that the proposed model can increase traffic flow and reduce congestion time with achieving stable state in relatively short period of time, and the road traffic rate can be improved by 27%.
2023 Vol. 44 (6): 680-686 [Abstract] ( 23 ) [HTML 1KB] [ PDF 2995KB] ( 376 )
687 Optimization algorithm for joint sparse hybrid precoding in millimeter wave massive MIMO systems
LI Zhengquan1,2, LI Shumei1
To improve the spectral efficiency and bit error ratio performance in the millimeter wave massive multiple input multiple output (MIMO) systems, a hybrid precoding optimization algorithm was proposed based on joint sparsity. According to the sparseness property of the millimeter wave channel in the angular domain, the lobe channel was reconstructed, and the hybrid precoding design was divided into multiple sub-problems for each lobe subchannel. To solve the sparse reconstruction problem with nonconvex constraints, the implicit sparse structure of digital precoding matrix was used to design the self-support set and common support set of analog precoding matrix for each data stream. Based on the correlation between analog precoding matrix and digital precoding matrix, the analog precoder and the digital precoder were jointly optimized. The computation complexity analysis and simulation analysis were completed. The results show that compared with the OMP algorithm, the proposed algorithm exhibits remarkable 91% or 93% reduction in computational complexity with enhancing spectral efficiency and bit error ratio performance when compared to the SLD algorithm.
2023 Vol. 44 (6): 687-695 [Abstract] ( 26 ) [HTML 1KB] [ PDF 1625KB] ( 420 )
696 Path planning of improved A* algorithm based on geomagnetic matching aided navigation
SUN Qi， BIAN Qiang， TONG Yude
To solve the problems of complex environment, many obstacles and difficult practical application for underwater unmanned vehicle path planning, the A* algorithm path planning method was proposed based on geomagnetic matching aided navigation. Definitions of maneuvering performance constraints of sailing time constraints, maximum range constraints, turning angle constraints and obstacle collision constraints of vehicle were given. The search direction of the A* algorithm was optimized to reduce the needed searching number of nodes and improve the efficiency of path planning. The greedy method was used to search the removal of redundant nodes for reducing the turning number of the unmanned underwater vehicle. The geomagnetic information entropy was introduced into the fitness function, and the paths were planned according to the regions with geomagnetic information changed significantly and verified by the MAGCOM geomagnetic matching algorithm. The comparative simulation experiments including vehicle maneuverability constraints, background geomagnetic information, underwater topography and underwater threats were designed. The results show that by the improved A* algorithm, the path length is reduced by 42.02%, and the number of turns is decreased by 92.31%, while the path has good geomagnetic matching adaptability, which can effectively reduce the matching radial error and mean square error.
2023 Vol. 44 (6): 696-703 [Abstract] ( 26 ) [HTML 1KB] [ PDF 3995KB] ( 357 )
704 Flow channel optimization for proton exchange membrane fuel cell based on enhanced mass transfer
CHEN Ben, LIU Yingjie
The performance of proton exchange membrane fuel cell (PEMFC) is closely related to the mass transfer performance. A new type of three-dimensional blockage was designed in the cathode flow channel to produce throttling effect on air. The effects of straight channel and different throttling channels on mass transfer performance of PEMFC were investigated. The variation rules of water and gas distribution, net power and effective mass transfer coefficient of the battery with different flow channels of the throttling unit were analyzed. The results show that the throttling channel can effectively improve the battery performance, optimize the distribution of water and gas, and increase the maximum net power and the effective mass transfer coefficient. Compared with the straight channel, the current density of the downstream local blockage distribution and encryption of the throttling channel is increased by about 29.2%, and the maximum net power is increased by 10.5%-11.7%， while the effective mass transfer coefficient is increased by 50.2%-100.7%.
2023 Vol. 44 (6): 704-709 [Abstract] ( 27 ) [HTML 1KB] [ PDF 1759KB] ( 343 )
710 Effects of catheter pump auxiliary mode on cardiovascular and coronary hemodynamics
WANG Fangqun, ZHANG Zhihao, ZHU Fenglian, ZHANG Yao, XU Fan, HE Chenyang
The Impella-like catheter pump assisted centralized parameter model of cardiovascular and coronary artery system was constructed to investigate the hemodynamics of patients with coronary stenosis and the influence of catheter pump on coronary artery system by numerical method. The results show that different auxiliary modes of catheter pump can effectively improve the cardiovascular cardiac output in patients with left main stenosis complicated with heart failure for helping the left ventricle unload. The variable speed model and constant speed model of the catheter pump can effectively improve the blood perfusion volume and coronary pressure of coronary artery in the case of stenosis to maintain the stability of hemodynamics. When the stenosis degrees of left main trunk are 60% and 80%, the flow rates of left main trunk can be respectively increased by 38.1% and 47.4% at variable speed, which are higher than those at constant speed mode. Compared with constant speed assisted mode, variable speed mode has obvious advantages for improving cardiac output, stenosis coronary artery flow and blood flow pulsatility.
2023 Vol. 44 (6): 710-718 [Abstract] ( 24 ) [HTML 1KB] [ PDF 3602KB] ( 406 )
719 Molecular dynamics simulation of thermal decomposition of iso-pentanol
ZHU Yuejin1, LIU Xiuting1, ZHAO Min1, ZHANG Zuowei2
To explore the process of thermal decomposition of iso-pentanol, the reactive force field molecular dynamics method was used to simulate the thermal decomposition process, and the effects of temperature on the thermal decomposition were investigated. The results show that the initial reaction of iso-pentanol thermal decomposition is mainly divided into two categories of C—C bond cleavage and O—H bond cleavage. In the specific thermal decomposition process, propylene and ethylene are the first two products to be generated, and the number of ethylene molecules is much larger than that of propylene. The main products of iso-pentanol thermal decomposition are hydrogen, water, propylene, ethylene, propyne, methane and formaldehyde. The increasing temperature can accelerate the thermal decomposition of iso-pentanol and promote the formation of reaction products. However, the products of thermal decomposition of iso-pentanol at different temperatures are varied with time. Propylene is mainly formed at temperatures of 2 000 K and 2 400 K. When the temperature rises to 2 800 K, the number of propylene molecule is increased rapidly to the maximum value with latter decreasing.
2023 Vol. 44 (6): 719-724 [Abstract] ( 22 ) [HTML 1KB] [ PDF 1723KB] ( 423 )
725 Volume change of triaxial soil samples based on photogrammetry technology
MU Chunmei1,2, XIA Yi1, LI Wenjie1, HUANG Shaoran1
Based on the new photogrammetry technology, the calculation results of the soil sample marker coordinates were corrected by the least square method and the refractive correction coefficient, and the three-dimensional coordinates of the soil sample deformation were calculated. The boundary function method was used in MATLAB software to calculate the volume change data of each part of the soil sample. According to this principle， the unconsolidated and undrained（UU） tests of saturated red clay samples from Guilin, Guangxi under different confining pressures were carried out. The test results show that the "true deformation measurement" of the soil sample in different deformation stages can be completed by photogrammetry, and the deviator stress of the soil sample is 5.7% smaller than that of the conventional measurement method. The overall and local volume change data of the soil sample under non-uniform deformation are obtained by the new photogrammetry technology, which can take into account both measurement and reduction of 3D model of soil sample, and the non-contact volume change data measurement is realized.
2023 Vol. 44 (6): 725-730 [Abstract] ( 22 ) [HTML 1KB] [ PDF 1795KB] ( 337 )
731 Resistance of manufactured sand concrete with fly ash to chloride ion attack under dry-wet cycle
Resistance of manufactured sand concrete with fly ash to chloride ion attack under dry-wet cycle
To investigate the transportation mechanism of chloride ion in manufactured sand concrete (MSC), the chlorine salt erosion tests under dry-wet cycle were carried out under the conditions of different sand replacement rate, fly ash content and stone powder content. The mass fraction of free chloride ions and diffusion coefficient of chloride ions in concrete were obtained by the experiments. The results show that with the increasing of manufactured sand (MS) replacement, the chloride concentration at the same concrete depth and chloride diffusion coefficient of concrete is decreased with latter increasing. The concrete with 50% manufactured sand has the highest resistance performance to chloride ion penetration. With the increasing of fly ash content, the chloride penetration resistance of manufactured sand concrete is increased with latter decreasing. The manufactured sand concrete with 30% fly ash can resist the chloride penetration with the best effect. Compared with the MS without or containing 11.6% stone powder, the chloride ion erosion resistance of concrete with 5.8% stone power is the strongest. Proper amount of manufactured sand in concrete can improve the durability life of concrete in the dry-wet cycle of chloride solution.
2023 Vol. 44 (6): 731-737 [Abstract] ( 23 ) [HTML 1KB] [ PDF 3980KB] ( 445 )
738 Evolution characteristics of PM2.5 in Zhenjiang Port based on EEMD-MFDFA
ZHENG Minxue1， MAO Jing1， SUN Zhihao1， ZHU Long1， LI Zhijian2， JU Zhen2， HUANG Aiguo2
To quantitatively analyze the internal evolution characteristics of PM2.5 time series in Zhenjiang Port, taking 205 667 PM2.5 hour concentration series in Zhenjiang port from 2019 to 2020 as basic data, the multifractal detrended fluctuation analysis（MFDFA）method based on ensemble empirical mode decomposition（EEMD）was used. The results show that the evolution of PM2.5 concentration at each monitoring point has significant long-term persistence characteristics. The rise of PM2.5 concentration at present stage may lead to the rise of PM2.5 concentration in the future. The multifractal spectrum parameters of PM2.5 concentration at different monitoring points are different. Areas with strong multifractal characteristics should be focused on immediate prevention and control, on the contrary, long-term supervision should be paid attention to. According to the theory of self-organized criticality, the fluctuation of PM2.5 concentration at 15 monitoring points presents the characteristics of power-law distribution, which is in line with the self-organized criticality.
2023 Vol. 44 (6): 738-744 [Abstract] ( 23 ) [HTML 1KB] [ PDF 2564KB] ( 359 )
江苏大学学报（自然科学版）
　

News

 　
· 关于近期网络不稳定情况的说明
· Our journal has be included in JSTChina Database
· Our journal has be selected for the 2015-2016 China Science Citation Database (CSCD)
　　　　　　　　        　　More 
　

Links

 　
· Chinese Library Classification Number
· Society of China University Journals
· China National Knowledge Infrastructure
· Chinese Sciencepaper Online
· Transactions of the Chinese Society for Agricultural Machinery
· Journal of Southeast University：Natural Science Edition
　　　　　　　　        　　More 
 

Copyright © 2011 Journal of Jiangsu University(Natural Science Eidtion)
Support by Beijing Magtech Co.Ltd   E-mail：support@magtech.com.cn