Journal of Jiangsu University(Natural Science Eidtion)

[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

　

　

　

　

　

　

Editor-in-chief

　

Journal Online

　

　

Forthcoming Articles

　

　

　

　

　

Download Articles

　

　

Quick Search

Advanced Search

Journal of Jiangsu University(Natural Science Eidtion)

	2021 Vol.42 Issue.4 Published 2021-05-10

	373	Analysis of human-like steering control driver model for intelligent vehicle
		JIANG Haobin， ZHOU Xinchen， LI Aoxue
		To make the intelligent vehicle obtain humanlike behavior when passing a curve road, a humanlike steering control driver model was proposed based on optimal curvature preview driver model and TS fuzzy inference system to adjust the preview point on both lateral and longitude directions. The driving data from experienced driver model were collected in an urban curve road, and the optimal target was obtained after data analysis. Ant colony optimization (ACO) was used in tuning the fuzzy parameters in the preview decision module. A multicurvature driving scenario was built in Prescan, and the humanlike characteristic of the proposed driver model was verified by the trajectories of experienced drivers collected by a driving simulator. The results show that the trajectory similarity between the experienced drivers and the humanlike steering driver model is higher than those of the optimal curvature preview model and the driver model with adaptive preview distance.
		2021 Vol. 42 (4): 373-381 [Abstract] ( 35 ) [HTML 1KB] [ PDF 20011KB] ( 300 )

	382	Analysis of localization characteristics of urban road vehicle driving cycles
		YANG Yang， ZHANG Tao
		To clarify the importance of urban road vehicle driving cycles as nonstandard driving cycles in vehicle emission assessment, the localization characteristics of urban road vehicle driving cycles were analyzed from the time and space dimensions. By collecting the actual onroad driving data in Nanjing city, the microtrips were extracted from timespeed data using principal component analysis and cluster analysis to construct the Nanjing local driving cycles, and the Nanjing local driving cycles in 2017 and 2009 were compared and analyzed from the time dimension. The Nanjing local driving cycles in 2017 were also compared with the local driving cycles in other cities in China, and the localization characteristics of urban road vehicle driving cycles were analyzed from the spatial dimension. The results show that even the same test and data processing methods are used in the construction process of local driving cycles, there are still significant differences for Nanjing local driving cycles in different years. Due to the significant differences in driving parameters among domestic cities, it is necessary to construct the local driving cycles in different cities. The local driving cycles should be constructed and updated regularly, which is helpful to obtain consistent emission factors with the actual emissions of inuse vehicles.
		2021 Vol. 42 (4): 382-388 [Abstract] ( 20 ) [HTML 1KB] [ PDF 2064KB] ( 420 )

	389	Vehicle target detection algorithm based on fusion of lidar and millimeter wave radar
		WANG Hai， LIU Mingliang, CAI Yingfeng, CHEN Long
		To solve the problems of insufficient detection accuracy of the target detection algorithm based on single sensor and slow detection speed of the multisensor fusion algorithm based on image and lidar, a vehicle target detection algorithm was proposed based on the fusion of lidar and millimeter wave radar. The depth information of lidar point cloud and the target information of millimeter wave radar were fully used, and the normalization method was adopted to preprocess the point cloud for generating feature maps. The millimeter wave radar data were fused to generate interested regions, and a multitask classification regression network was designed to achieve vehicle target detection. The training verification was performed on Nuscenes large data set. The results show that the detection accuracy can reach 6052%, and the point cloud detection takes 35 ms per frame. The proposed algorithm can meet the accuracy and realtime requirements of intelligent driving vehicles for vehicle target detection.
		2021 Vol. 42 (4): 389-394 [Abstract] ( 38 ) [HTML 1KB] [ PDF 32160KB] ( 394 )

	395	Analysis of contact characteristics of doublelayer metal composite inner ring rolling bearings
		FAN Shutian, XU Xingchao, WANG Yun, WANG Jiaqi, WANG Xiaokang
		To solve the problem that cylindrical roller bearings were easily worn under heavy load conditions, a doublelayer metal composite inner ring cylindrical roller bearing was designed. Taking the contact between the composite inner ring and the roller as example, the maximum contact stress of a single roller and the bearing inner ring was obtained based on Hertz contact theory and Boussinesq theory. The mechanical model of combined layer composite material was used to calculate the doublelayer metal composite equivalent elastic modulus of inner ring. The contact model between inner ring and single roller was established, and the finite element simulation method was used to explore contact stress and elastic deformation for different material thickness. Through contact friction test, the contact widths were verified with different material thicknesses of composite inner ring. The results show that the contact deformation of doublelayer metal composite between inner ring bearing roller and inner ring is increased with reduced contact stress, which is helpful to reduce the wear of cylindrical roller bearing.
		2021 Vol. 42 (4): 395-399 [Abstract] ( 22 ) [HTML 1KB] [ PDF 5432KB] ( 385 )

	400	Design and optimization of double-sided linear primary permanent magnet vernier motor
		DU Yi, YIN Wen
		Combining the response surface method(RSM) with the finite element method, a doubleside linear primary permanent magnet vernier (DSLPPMV) motor was optimized based on the optimization objectives of thrust force and iron loss. The influence of design parameters on motor thrust force and iron loss was analyzed to obtain the high sensitivity parameters. The thrust force and the iron loss for different parameters were calculated by the finite element method. The models of thrust force and iron loss were obtained by response surface method to obtain the optimal design point and the optimal dimension parameters. The model accuracy was verified by variance analysis, and the prototype was built to verify the analysis method by experimental test. The results show that the efficiency and accuracy are increased by the analysis method, and the motor performance is improved after optimization.
		2021 Vol. 42 (4): 400-405 [Abstract] ( 40 ) [HTML 1KB] [ PDF 2420KB] ( 363 )

	406	Optimization design and test of airflow field fo orchard air-blast sprayer
		ZHANG Junxiong, ZHU Xiangsen, LIU Jingyun, GAO Jin, ZHANG Kaifei
		To solve the problem that the airflow field distribution of the orchard airblast sprayer with axial flow fan was difficult to match the spray requirement of the canopy area of fruit tree, a method was proposed for optimizing the airflow field of the fan. By adding and optimizing air deflectors inside the blower on the middle and rear airflow guide plate and the outlet of blower, the matching effect between the airflow field and the spray requirement of the canopy of fruit tree was enhanced to improve the spray quality. Applying SolidWorks, PolyWorks and Geomagic Studio, the threedimensional model of blower was established. Based on the κε turbulence model, the Fluent software was used to simulate the airflow field. The prototype was produced， and the actual airflow velocity was measured and compared. The results show that by optimizing the diversion device, the average airflow speeds on the left and right side of the sprayer are respectively increased by 291% and 325% in the height range from 100 to 190 cm of fruit tree canopy.The penetration ability of the airflow to the fruit tree canopy can be enhanced to improve the spray effect.
		2021 Vol. 42 (4): 406-413 [Abstract] ( 39 ) [HTML 1KB] [ PDF 7441KB] ( 353 )

	414	Simulation and optimization design and experiment of airflow field in safflower picking chamber
		CHEN Fei, GE Yun, ZHANG Lixin, ZHANG Xiaowei, XIA Yuanqi
		To improve the collection efficiency and quality of safflower silk after picking, the airflow field in the picking chamber of portable counter roller safflower harvester was optimized. The relationship between the diversion holes in the picking chamber of safflower harvester and the trajectory of safflower filaments was investigated, and a gassolid twophase flow distribution model of the safflower harvester was established based on the Fluent fluid simulation software. The boundary conditions and the model parameters were determined based on the measured data of safflower harvester，and the distributions of airflow field under different parameters of diversion holes were obtained. The verification test under the same conditions as the simulation was designed, and the highspeed camera and the test equipment were used to verify and analyze the simulation results. The test conclusions and simulation results show that the preferred parameters of the safflower picking chamber are determined with diversion hole diameter of 6 mm, diversion hole number of 3, vertical diversion hole arrangement and distance between the diversion holes of 15 mm. For the preferred parameters, the flow velocity of airflow field in the picking chamber is stable, and the filament trajectory is relatively consistent with high filament collection efficiency.
		2021 Vol. 42 (4): 414-420 [Abstract] ( 28 ) [HTML 1KB] [ PDF 6975KB] ( 377 )

	421	Working mechanism of solid fertilizer deep fertilizing machine and optimization design of core components
		QIAN Mengbo， LI Xibin， WANG Wanglong， REN Chenglong
		An orchard spiral solid fertilizer deep fertilizing machine was designed by Solidworks 2016, and the static stress analysis and the modal analysis of spiral drill bit were carried out by Simulation.The optimization was carried out with the wall thickness of drill shaft as index.The results show that the optimal solution for the wall thickness of drill shaft is 4 cm, and the maximum stress of spiral blade is mainly concentrated at the welding position of lower blade of drill shaft with the maximum value of 121.5 MPa. The weight of drill bit is reduced by 8.04 kg after optimization. The modal analysis results illuminate that the working speed of drill bit can avoid the critical speed to avoid resonance. The deep fertilizing machine can not only control the amount of applied fertilizer accurately, but also realize the continuously mechanized operation of ″digging holes, fertilizing and covering soil″ in the fertilization process. The fertilizing machine can also be adopted in the narrow working environment of mountain orchards.
		2021 Vol. 42 (4): 421-427 [Abstract] ( 28 ) [HTML 1KB] [ PDF 3217KB] ( 295 )

	428	Multi-label learning based on boosting clustering trees
		WANG Jin, YU Wei, SUN Kaiwei, DENG Xin
		To explore the specific features of each label in multilabel data sets and effectively utilize the specific features of the label, the multilabel learning based on boosting clustering trees (MLLBCT) was proposed. The overall framework of BCTMLL was built, and the correlations among data samples were explored to deal with multilabel learning problems. The clustering feature tree was introduced to find the correlation between data samples, and the randomly selected subsets of training data were learned to construct label specific features, which could generate proper features for each label and improve the overall performance of multilabel learning. The proposed method was compared with the classical multilabel learning methods of LIFT, LLSF, REEL and LLSFDL in specific feature fields on 11 data sets such as flag and emotions. The results show that the new method can effectively improve the prediction performance in all evaluation indicators of Hamming Loss, Oneerror, Ranking Loss, Average Precision, Microaveraged FMeasure, and the proposed method is simple and flexible.
		2021 Vol. 42 (4): 428-437 [Abstract] ( 35 ) [HTML 1KB] [ PDF 2371KB] ( 409 )

	438	Weak intermittent fault amplitude detection of wind turbine blade based on fractional chaotic system
		GAO Bingpeng, WANG Weiqing
		To solve the problem that it was very difficult to detect the growth of weak intermittent fault due to the special working conditions of wind turbine, a detection method of weak intermittent fault amplitude was proposed based on fractional chaotic system. The phase state discrimination method of chaotic system was given, and the principle and process of Poincare section density peak algorithm (PSDPA) was expounded to construct the intermittent fault development function (IFDF). The vibration signals at the radial and axial slight cracks of the wind turbine blade were collected, and the amplitude variation of the radial and axial weak intermittent fault of the wind turbine blade was analyzed by PSDPA and IFDF. The results show that the fast phase state discrimination of chaotic system can be realized by PSDPA, and the growth trend of intermittent fault can be directly characterized by IFDF curve to reveal the development process of a weak intermittent fault growing into a permanent fault.
		2021 Vol. 42 (4): 438-444 [Abstract] ( 26 ) [HTML 1KB] [ PDF 3493KB] ( 363 )

	445	Geometry preserving graph embedding based on probabilistic collaborative representation
		LIU Yong, YANG Yuanyuan， GOU Jianping， LIU Zhifeng
		To fully capture the geometric information of data and enhance the power of pattern discrimination, a dimension reduction method of probabilistic collaborative representation geometry preserving graph embedding (PCRGPGE) was proposed based on the ability of probabilistic collaborative representation for capturing the discriminant and geometric information of data. In the new method, the similar highdimensional samples had the similar probabilistic collaborative representations, which were also similar in the subspace through graph embedding, so that the lowdimensional latent structure of highdimensional data was well preserved in the subspace. In the PCRGPGE, the high dimensional data was given by the probabilistic collaborative representation and reconstructed to obtain the natural discriminant and geometric information. The intraclass and interclass graph constructions were used to discover the discriminant information and the geometric distributions of data. The experiments were conducted to compare PCRGPGE with ten stateoftheart graph embedding methods such as PCA, LDA and LPP on two public PIE29 and IMM face image classification data sets. The results show that the proposed PCRGPGE is a promising dimension reduction method, which can well preserve the intrinsic structure of highdimensional data and enhance the pattern discrimination in the lowdimensional space.
		2021 Vol. 42 (4): 445-450 [Abstract] ( 22 ) [HTML 1KB] [ PDF 2632KB] ( 355 )

	451	Carbon emissions prediction of Chongqing city based on production function theory
		PENG Meng, WU Jian, CHEN Liurui, WANG Lei, XU Jiayu
		To confirm the effects of the development of economy and society and the utilization of fossil energy on the increasing of carbon emissions, the carbon emission of Chongqing city, a typical industrial city in the Yangtze River economic belt, was predicted. Based on the endogenous growth theory, the driving factors of carbon emission in Chongqing city by GDP, population and energy structure were analyzed and forecasted by the methods of data investigation and scenario analysis. Based on the production function theory, the comprehensive carbon emission model was built, and the carbon emission of Chongqing city from 2014 to 2035 was estimated. The results show that Chongqing′s GDP is expected to reach 494.03 million yuan by 2035, and the added value of the secondary and tertiary industries accounts for 97.72%. The population will reach 34.28 million, and the urban population accounts for 91.17%. The proportion of fossil energy consumption will drop to 84.53%, and the energy consumption intensity will drop to 4 400 tons of standard coal·(10 000 yuan)-1. When the growth of various driving factors is consistent with the endogenous growth trend, Chongqing′s carbon emissions will reach a peak of 1757 million tons around 2025.
		2021 Vol. 42 (4): 451-457 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1850KB] ( 349 )

	458	Detection method of electric shock current based on envelope feature of time domain waveform of chaotic signal
		SHI Zhai, LI Chunlan, WANG Changyun, XIA Lanlan, REN Peng
		To solve the problems of residual current protection device with refusing to operate, maloperation and difficult extracting of electric shock current signal, a chaotic detection method of electric shock current was proposed based on time domain waveform envelope characteristics of chaotic signal. Based on the sensitivity of chaotic system to initial conditions and immunity to noise, a phase detection method was proposed by vector analysis according to chaos theory. According to the difference of output xtimedomain waveform envelope in different states of chaotic system, the standard deviation of xtimedomain waveform extreme point sequence was proposed as index to measure the fluctuation characteristics of waveform envelope, and the critical state of chaotic system could be automatically identified. A method of detecting the amplitude of electric shock current was proposed by vector analysis. The results show that the proposed chaotic criterion can accurately judge the periodic state and chaotic state of the system, and the electric shock current signal can be detected from the total residual current with average error of 4.64%.
		2021 Vol. 42 (4): 458-465 [Abstract] ( 20 ) [HTML 1KB] [ PDF 1866KB] ( 376 )

	466	Sensitivity analysis of parameters for controllable transformer rectifier
		LIU Jianying， BI Sheng， WU Donghua， YANG Zhangang
		To solve the problem that the traditional uncontrolled voltage transformation rectifier with diode and load could cause a lot of harmonic and reactive power pollution to the aircraft power grid in the process of nonlinear operation, a voltage and current double closedloop control structure of controllable voltage transformation rectifier was proposed. The mathematical model of the equivalent circuit of the controlled rectifier was established by dq transformation method, and the steadystate operating point of the system was obtained by power flow calculation. The sensitivity of electrical parameters and control parameters to the small disturbance stability of the controlled rectifier near the steadystate operating point was analyzed. The analysis results and simulation results show that the power supply circuit of controlled rectifier has good voltage stabilizing effect. The small signal stability of the system can be significantly improved by decreasing the integral coefficient of the outer loop voltage loop and the daxis proportional coefficient of the inner loop current loop or increasing the proportional coefficient of the outer loop voltage loop and the daxis integral coefficient of the inner loop current loop.
		2021 Vol. 42 (4): 466-472 [Abstract] ( 32 ) [HTML 1KB] [ PDF 1574KB] ( 329 )

	473	Preparation of polyureabased iron red anticorrosive coating for pipelines
		WANG Xinrui, LIU Lizhu, ZHANG Xiaorui, WENG Ling, ZHU Xingsong
		To solve the problems of solvent volatilization and slow curing of commonly used iron oxide red anticorrosive coatings for underground pipelines, polyaspartic acid polyurea was used as matrix with iron oxide red as pigment filler to prepare polyurea anticorrosive coatings. FTIR test was used to characterize the structure of polyurea, and the anticorrosive properties of coating were characterized by salt spray resistance time and electrochemical test. The results show that the prepared polyaspartic acid polyurea is suitable for coating application. The polyurea anticorrosive coating has excellent anticorrosive properties. When the iron oxide red content is 10%, the salt spray resistance time can reach 260 h, and the maximum corrosion potential is -0887 6 V with the minimum corrosion current density of 2.608×10-5 A·cm-2.
		2021 Vol. 42 (4): 473-477 [Abstract] ( 32 ) [HTML 1KB] [ PDF 2960KB] ( 395 )

	478	Soil barrier factors affecting chlorosis of camphor tree leaves in street greening
		LI Limin, YU Yingcui, LIU Sichun, WU Lianghuan, LI Xiaoming
		To investigate the main factors affecting chlorosis of camphor tree leaves in Zhangjiagang city, taking the site soil of chlorosis camphor tree on both sides of the 4 main streets in Zhangjiagang city as research object and with the site soil of normal camphor tree as contrast, the soil samples from 0 to 20 cm and from 20 to 40 cm were collected, and the physical and chemical properties of soil sample were determined. The relationship between chlorosis camphor trees and soil physical and chemical properties was analyzed. The results show that soil pH, HCO3-, available phosphorus and available copper of chlorosis trees are higher than those of normal trees, while organic matter, available nitrogen, available potassium, available iron, available manganese and available zinc are lower. Soil pH, HCO3-, available phosphorus and available copper are negative correlation with available iron, while organic matter, available nitrogen, available potassium, available manganese and available zinc are positive correlation with available iron.
		2021 Vol. 42 (4): 478-484 [Abstract] ( 31 ) [HTML 1KB] [ PDF 1130KB] ( 323 )

	485	High-temperature wetting behavior and interfacial bonding properties of borosilicate glass on alumina ceramic substrate
		LIU Xincheng, SHAO Haicheng, QIAO Guanjun, LU Haojie, LIU Guiwu
		Borosilicate glass was used as solder, and alumina ceramic sheets were used as substrate. The hightemperature wetting behavior and interfacial bonding properties of glass solder on alumina ceramic substrates were investigated, and the effects of temperature, atmosphere and pressure on the microstructure and properties were analyzed. The results show that the minimum contact angle between 580 ℃ molten glass solder and ceramic substrate under vacuum is 15.54°, and the glass solder and the alumina ceramic substrate have good wettability. Sintered under no pressure at 580 ℃, the bonding strength is the highest with value of 36.38 MPa. According to the microstructure analysis, when the glass solder and the substrates are sintered under vacuum at 580 ℃, there are no obvious bubbles inside the glass solder with good interface combination to ceramic substrate.
		2021 Vol. 42 (4): 485-490 [Abstract] ( 47 ) [HTML 1KB] [ PDF 13625KB] ( 308 )

	491	Steel bar protection test in magnesium cement concrete with different protective layer thickness
		QIAO Hongxia, YANG Zhenqing, WANG Penghui, WEN Shaoyong, YANG Tianxia
		To investigate the slight corrosion to steel bars due to the bittern in magnesium cement, a durability test was carried out on magnesium cement concrete components. Combined with different environments, concrete protective layer thickness and increasing steel coating, the electrochemical test of steel in the specimen was carried out, and the specimen was determined by SEM topography and XRD diffraction. The results show that under natural dry environment, the corrosion processes of magnesium cement components with 25 mm and 50 mm concrete protective layer thicknesses are about the same, and the steel bars with 50 mm concrete protective layer thickness are more susceptible to corrosion. Under the condition with 25 mm concrete protective layer thickness, the corrosion of steel bars in magnesium cement concrete components in chloride and natural dry environments shows that the presence of coating can effectively reduce the corrosion current density of steel bars, and the protective effect of steel bars is more prominent under the condition with chloride salts.
		2021 Vol. 42 (4): 491-496 [Abstract] ( 28 ) [HTML 1KB] [ PDF 96658KB] ( 285 )

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