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)

	2014 Vol.35 Issue.4 Published 2014-07-10

	Article

Article

	373	Overview of power-switch coordinated control of hybrid electric car
		He Ren, Shu Chi
		The power-switch and coordinated control issues of hybrid electric vehicle (HEV) become increasingly important because the HEV has diversity driving and braking modes. In order to investigate power-switch coordinated control technology, a brief description of coordinated control problems was given. Based on engine torque estimation, modeling tool, control strategy and testing method, the coordinated control problems were analyzed, and the relevant limitations were also discussed. The key technologies about coordinated control problems were proposed. The model was established to reflect the transient characteristics of parallel hybrid electric vehicle power switching. The control strategy was proposed based on motor torque compensation, experimental study and transient stability analysis.
		2014 Vol. 35 (4): 373-379 [Abstract] ( 1477 ) [HTML 1KB] [ PDF 1578KB] ( 1869 )

	380	Experiment on removal of polycyclic aromatic hydrocarbons emissions in diesel engine exhaust with non-thermal plasma
		Cai Yixi, Dong Miao, Li Xiaohua, Jiang Fei, Han Wenhe
		In 186FA single cylinder diesel engine, the polycyclic aromatic hydrocarbons (PAHs) samples before and after non-thermal plasma (NTP) were collected by glass filters and XAD-2 collectors, and the effects of NTP on PAHs emissions at various loads were analyzed combined with the gas chromatography-mass spectrometry (GC-MS). The results indicate that original emissions of PAHs with two rings and three rings increase firstly and then decrease with the increasing of load, while the trends with four rings and five rings are reversed. The removal effect of NTP on CHR is the best with the highest removal rate of 78.63%. The total emissions of PAHs are reduced evidently after NTP with the maximum removal efficiency of 37.87%. The average emissions of PAHs before and after NTP decrease with the increasing of benzene rings, and the PAHs emissions with two rings account for the largest percentage.The average emissions of PAHs with different rings are reduced after NTP with the removal rate from 17.9% to 31.0%.
		2014 Vol. 35 (4): 380-385 [Abstract] ( 1479 ) [HTML 1KB] [ PDF 1637KB] ( 1273 )

	386	Dimethyl ether spray characteristics under engine-like conditions
		Sun Jing1,2, Zhang Guangde1, Mimura Takashi2, Kinno Mitsuru2, Wakabayashi Daiki2
		The background scattering method was used to only take liquid state spray videos. The actual pressure and the temperature conditions in turbocharged engines were simulated in a constant volume vessel, and the DME spray characteristics were investigated with ultra-high speed camera. The influences of environment temperature and pressure, injection pressure and nozzle diameter on spray characteristics of DME were also investigated. The results show that the spray penetration distance increases with the increasing of injection pressure and nozzle diameter. Under the conditions with high temperature and high pressure in turbocharged engine environment, the spray penetration distance decreases when the ambient gas density and the temperature are increased. The liquid drops appear around DME sprays only at normal temperature. Compared with diesel spray, DME spray evaporates more quickly. For both of the two kinds of spray, the outline parts show unregulated wave shape.The diesel spray is broken into particles constantly with droplet splitting, while the DME spray division is directly started from the main spray rapid evaporation.
		2014 Vol. 35 (4): 386-390 [Abstract] ( 2421 ) [HTML 1KB] [ PDF 2065KB] ( 1278 )

	391	Structural optimization of FFU based on numerical simulation and experiment
		Wang Junfeng, Hu Weiwei, Zhang Zheng, Wu Qi
		Based on numerical simulation and experiment, the internal structure of fan filter unit was optimized. The distribution of internal flow field was obtained by CFX. The error is admitted through comparing the results of experiment and simulation at the same points, which proves the reliability of simulation results. To ensure energy savings and uniformity of air supply, a series of optimization measures were proposed. The sudden expansion region of flow channel was modified to make the internal vortices disappear and reduce the resistance of fan filter unit. The deflector was redesigned to solve the problem of nonuniform velocity, and the actual product was tested on the test bench. The results show that after modification, the velocity distribution becomes more uniform with higher static pressure and aerodynamic efficiency.
		2014 Vol. 35 (4): 391-396 [Abstract] ( 1497 ) [HTML 1KB] [ PDF 2219KB] ( 1261 )

	397	Numerical-simulation of heat transfer characteristics for laminar flow over a two dimensional backward-facing step
		Zhong Minbo1, Xie Weian2, Yuan Yinnan1,2, Xi Guannan1,2
		A two-dimensional incompressible numerical model of the backward-facing step flow was established. The influences of Reynolds number, step height(S) and channel height(H) on the Nusselt number at the bottom wall surface downstream of the step were discussed in the laminar flow range of Re from 100 to 400. The results show that for constant expansion ratio of ER, the positions of inflection points for Nusselt number curves are stable when an additional recirculation region appears on the upper wall. Increasing the Reynolds number can improve the upstream Nusselt number of inflection points, but has slight effect on the downstream Nusselt number. When S is constant with decreased H, ER increases from 1.33 to 3.00, and the variation range of Nusselt number(Nu) increases with the position of Nu peak moving upstream. When H is constant with increased S, the variation range of Nusselt number(Nu H) can be divided into two parts. With the increasing of ER from 1.33 to 2.00, the value of NuH peak essentially remains unchanged, while the position of NuH peak moves downstream. With the increasing of ER from 2.00 to 3.00, the value of NuH peak rapidly increases, while the position of NuH peak changes slightly.
		2014 Vol. 35 (4): 397-402 [Abstract] ( 1307 ) [HTML 1KB] [ PDF 2539KB] ( 1402 )

	403	Thermal hydraulic performance analysis of inclined louvered fin
		Wang Yinghui, Xue Chengcheng, Hu Zicheng, Li Changfeng, Wang Qian
		Three-dimensional models of louvered fin and inclined louvered fin in fin-tube radiator were respectively established to investigate the fluid flow, the temperature and pressure fields when air flows over the two kinds of fins, and the differences of thermal hydraulic performance between them were analyzed. The calculated results show that the heat transfer factor and the friction factor of inclined louvered fin are both higher than those of louvered fin. Compared with the louvered fin, when Reynolds number varies from 558 to 2 510,j factor of the inclined louvered fin is increased from 29.8% to 18.6%, while f factor is increased from 39.7% to 58.9%. When Reynolds number is small, the maximum difference between the two kinds of j/f 1/3 factors is over 16%. When Reynolds number is over 2 232, the differences is not more than 3.2%. It indicates that the inclined louvered fin has better thermal hydraulic performance than that of louvered fin, especially under the condition of small Reynolds number.
		2014 Vol. 35 (4): 403-407 [Abstract] ( 1333 ) [HTML 1KB] [ PDF 2306KB] ( 1513 )

	408	Comprehensive evaluation of heavy metal for agricultural environmental soil land
		Wang Shengwei1,2, Liu Gang2, Feng Juan2, Zhang Tianjiao2
		The comprehensive evaluation method of heavy metal for pollution agricultural environmental soil land was investigated. The criterion of heavy metal comprehensive evaluation was established based on the heavy metal elements of Pb, Cd, Cu, Cr, Zn and similar heavy metal of As. The corrected fuzzy comprehensive evaluation model with ecological toxicity and health factor was proposed with high resolution and efficiency. The comparison evaluation of 47 delineations of soil for farmlands was conducted. The assessment results show that there are 33 uncontaminated grade polygon plots， and other 14 patterns appear under the state of second pollution stage. The heavy metal pollution plots account for 29.8% with total land area ratio of 32.1%. The land classification level is proportional to heavy metal pollution stage.The proposed comprehensive evaluation of heavy metal is suitable for agricultural environmental soil land.
		2014 Vol. 35 (4): 408-415 [Abstract] ( 1485 ) [HTML 1KB] [ PDF 1627KB] ( 1262 )

	416	Mesh deformation method based on skeleton-driven
		Lu Youtai1,2, Zhou Laishui1, Li Yunping1, Wang Zhiguo1
		In order to preferably realize the constrained deformation of mesh models, an efficient method was proposed based on skeleton-driven by combining affine transformation and generalized metaball deformation technology. A skeleton was created for the region of interest (ROI) to map the vertices in ROI onto the skeleton. A deformable model of rotation, translation and scaling with potential function was selected to set the target values of deformation. The coordinate values of new vertices were computed according to the mapping relationship between original vertices and skeleton to obtain the mesh deformation. In order to solve the distortion in the translation process, a rotating field was established. The experiment results show that the proposed method is efficient and intuitive to maintain the local details well, and can be flexibly applied to the model deformations of rotation, translation, scaling and other operations.
		2014 Vol. 35 (4): 416-421 [Abstract] ( 1356 ) [HTML 1KB] [ PDF 2254KB] ( 1775 )

	422	Distributed K-Means clustering algorithm based on Fisher discriminant ratio
		Peng Changsheng
		To solve the problem that centralized clustering algorithms could not deal with big data sets, a distributed K-Means clustering algorithm was proposed based on the confidence radius by Fisher discriminant ratio in local nodes. The computing and storage capacitates as well as bandwidth of each nodes were used to share the time and space expenses to each nodes in the P2P networks. The Fisher discriminant ratio was applied to find the difference of dense and sparse distributions in the same cluster in local nodes. The ratio was used to deduce the confidence radius for the next clustering processing to maintain clustering accuracy, and the distributed clustering was speeded up at the same time. The numerical simulation of algorithm and experiments were completed based on real data. The results show that a good balance between accuracy and speed is obtained according to the data distributions. The proposed algorithm has better robustness than the DFEKM algorithm.
		2014 Vol. 35 (4): 422-427 [Abstract] ( 1616 ) [HTML 1KB] [ PDF 1940KB] ( 1787 )

	428	A semi-active battery-ultracapacitor hybrid energy source
		Wang Qi1,2, Sun Yukun1,2,3, Chen Kunhua1,2, Huang Yonghong1,2, Ji Xiaofu1,2
		To weaken the effect of pulse load on the cycle life of battery, a semi-active battery-ultracapacitor hybrid energy source was designed. The battery pack was connected with an ultracapacitor pack by a bothway DC-DC power converter and supplied power at pulse load. The control strategy of hybrid energy storage was that the battery supplied nearly constant current of average load current, while the ultracapacitor supplied the dynamic component to prolong battery cycle. The semi-active and passive battery-ultracapacitor hybrid system were modeled and simulated under MATLAB 7. The results show that the discharging current of battery pack of semi-active hybrid energy source is smoother than that of passive energy source, and the discharging process of the battery pack is optimized.
		2014 Vol. 35 (4): 428-433 [Abstract] ( 1452 ) [HTML 1KB] [ PDF 1866KB] ( 1493 )

	434	Reducing ripple of DC power supply using series hybrid active filter
		Li Hui
		Active filter (AF) was applied to reduce the ripple of DC power supply, and the principle was analyzed. Based on the conventional structures, a novel series hybrid DC active filter was proposed. The main DC ripple component was filtered by the passive components, and the active module was used to improve the filtering effect. The hybrid AF could ensure the active filters not bearing DC component voltage and not flowing DC component current, and could be realized easily. The mathematical model of the system was established based on transfer function, and the control system was also analyzed in detail. Incorporating simple feedback control and the resistive load synthesis technology, a hybrid control structure was proposed to improve the suppressing ripple effect of DC power supply. The proposed method was verified by simulation and experiment results.
		2014 Vol. 35 (4): 434-437 [Abstract] ( 1540 ) [HTML 1KB] [ PDF 1947KB] ( 1369 )

	438	Analysis of mechanical behavior of stud shear connectors for composite box girders
		Feng Jianping1, Huang Pingming1, Wang Shulai2, Zhu Zheng3
		In order to verify the feasibility and accuracy of finite element analysis on the mechanical performance of stud shear connectors， the mechanical behavior of stud shear connector was introduced. The solid model of stud shear connectors of composite box girders in a bridge was established by finite element software of ANSYS. Based on the entity model, five relevant parameters which affected the shear bearing capacity of the stud shear connectors were analyzed. The relevant parameters included the concrete strength grade, the stud diameter, the stud length, the material strength of stud and setting perforated rebar or not. Comparing the calculated results with those obtained from empirical formulas, the recommended formula of ultimate shear capacity for the stud shear connectors was obtained.
		2014 Vol. 35 (4): 438-443 [Abstract] ( 1594 ) [HTML 1KB] [ PDF 1757KB] ( 1205 )

	444	Dynamic response viscoelastic analysis of long-uphill asphalt pavement subjected to vehicle load
		Cao Weifeng1,2, Lü Pengmin1
		To investigate the dynamic response of long-uphill asphalt pavement subjected to climbing vehicle load，Dongfeng EQ1108G6D13 vehicle was selected as a representative vehicle.The load calculation model of climbing vehicle and the viscoelastic constitutive relation were achieved by finite element analysis to establish a three-dimensional transient finite element model of pavement. The variations of slope, load and temperature were analyzed by nonlinear solution of finite element model， and the situ strain experiment was conducted according to the simulation result. The results show that with the increasing of slope, the dynamic response increases slightly. With the increasing of vehicle load and temperature, the dynamic response is increased greatly, especially at high temperature. The maximum value of longitudinal shear strain appears 5 cm under road surface, while the maximum value of transverse shear strain concentrates 5~17 cm under road surface. The shear destruction easily occurs at mid-surface and the anti-shear ability should be improved. The difference between simulation and experiment results is less than 20%，which illuminates that the proposed model can well simulate the mechanical behavior of pavement subjected to climbing vehicle.
		2014 Vol. 35 (4): 444-451 [Abstract] ( 1339 ) [HTML 1KB] [ PDF 2400KB] ( 1675 )

	452	Relationship of macro cracks and microstructure of RPC component
		Jin Lingzhi1, He Pei1, Fu Qiang1, Chen Min2
		To investigate the internal structure of reactive powder concrete (RPC), the static load tests of three RPC beams were conducted at different temperatures to observe the cracks. The microstructures of RPC were determined by scanning electron microscopy (SEM). The results show that under the same load, RPC component has good internal structure at high curing temperature with smaller crack widths than those at normal maintenance temperature. RPC cement hydration products are mainly CSH gel with some Ca(OH)2, and no ettringite or other hydration product is found. There is no coarse aggregate in RPC without transition region interface among particles, and the crack resistance is good. The internal defects of RPC are partly filled by steel fiber to reduce microcracks and improve RPC interface strength.
		2014 Vol. 35 (4): 452-456 [Abstract] ( 1420 ) [HTML 1KB] [ PDF 2523KB] ( 1209 )

	457	Strength of air-entrained concrete under compression withconstant confined stress
		Shang Huaishuai1,2, Luo Jianlin1
		To accurately understand the properties of concrete materials under complex stress state， the compression tests of C30 air-entrained concrete under compression with constant confined stress were conducted. The failure characteristic of specimens and the cracking direction were observed. The results show that the strength under compression with constant confined stress was higher than the uniaxial compressive strength. The increasing value of strength reaches maximum when the lateral compressive stress ratio is 0.50, and the increasing value of strength decreases with the increasing of lateral compressive stress. The experimental results in the paper were compared with those in literature. The strength criterion with consideration of the influence of stress ratio was proposed to provide experimental and theory foundations for strength analysis of air-entrained concrete structures subjected to complex loading in cold environment.
		2014 Vol. 35 (4): 457-462 [Abstract] ( 1321 ) [HTML 1KB] [ PDF 1853KB] ( 1326 )

	463	Design and validation of scale-model test system for highway beam bridge subjected to moving vehicle
		Gui Shuirong1,2, Chen Shuisheng1, Wan Shui2
		According to the similarity theories of structure dynamic model test and vibration particularity of highway bridge-vehicle coupling, the similarity laws of bridge-vehicle interaction system were deduced based on π theorem with dimension matrix analysis. For the simple beam bridge with span of 30 m and vehicle loading of 330 kN, the similarity constants of the scale-model system for highway bridge-vehicle interaction were calculated with geometry scale factor of 10. The bridge-vehicle interaction system of perspex model bridge, testing pony truck and appendages was established. The dynamic particularities of model bridge and testing pony truck were analyzed through testing and numerical analysis. The static and dynamic responses of model bridge were studied based on a moving vehicle running on the smooth deck along normal lane. The comparing of model bridge testing results with numerical results of practical bridge by MATLAB was used to verify the similitude laws of bridge-vehicle interaction model. The results show that the error of model bridge primary frequency is 0.01%, and the testing pony truck is 3%. The results illuminate the feasibility of model test equipment and the validity of test results.
		2014 Vol. 35 (4): 463-469 [Abstract] ( 1342 ) [HTML 1KB] [ PDF 1795KB] ( 1686 )

	470	Corrosion resistance of optical fiber light conductive concrete with different variety of cement
		Wang Xingang1, Wang Kai2, Chen Fangbin1, Ye Xuna1
		Optical fiber light conductive concrete (OFLCC) was prepared with ordinary portland cement (P?O) or rapid-hardening sulphur aluminate cement (R?SAC) as matrix. Anti-erosion property and microstructure of OFLCC were investigated by sulfate attack resistance and alkali solution corrosion resistance tests, XRD and ESEM. Compared with the strength of OFLCC with P?O curing in alkali solution, the strength of OFLCC with R?SAC is decreased more obviously. The appearance of yellowing phenomenon and the corrosion degree of OFLCC with R?SAC curing in alkali solution are the most obvious. The corrosion degree curing in alkali solution is greater than that curing in salt solution. After OFLCC curing in alkali solution, the interface bonding between optical fiber and cement matrix is not quite close together, and there appears obvious micro defects to decrease the mechanical properties of OFLCC. The hydration products of OFLCC are composed of group C-S-H gel, needle stick ettringite, columnar gypsum, six-party laminated hydroxyl calcium stone and spherical aluminium glue, and they are intertwined and combined densely.
		2014 Vol. 35 (4): 470-473 [Abstract] ( 1834 ) [HTML 1KB] [ PDF 3732KB] ( 1451 )

	474	Synthesis and luminescence property of NaLa(MoO4)2∶Eu3+ spheres by microwave irradiation
		Dai Shenhua1,2, Peng Fulin3, Zhu Yuanyuan3, He Xiuming2, Guo Xinli1
		Uniform NaLa(MoO4)2 powders with spherical shape were synthesized by microwave irradiation. The influence of CTAB concentration on the particle morphology was investigated, and the particle size was measured by laser particle size analyzer. The results show that the morphology and homogeneity of the spherical particles are improved by CTAB. The particle size distribution is very narrow with D50 of 0.854 μm when CTAB concentration is 20 mmol?L-1, and it is good for dense layer of phosphor on substrate. The sample structure and composition were determined by XRD, TEM and EDS. The results show that NaLa(MoO4)2 has pure tetragonal phase with polycrystalline nature, and no other impurity is detected. Room temperature photoluminescence measurement of NaLa(MoO4)2∶Eu3+ shows that the sample can be effectively excited by UV, near-UV and blue light, and gives strong red emission at 616 nm. The red phosphor can be potentially applied in light-emitting diodes.
		2014 Vol. 35 (4): 474-478 [Abstract] ( 1510 ) [HTML 1KB] [ PDF 2558KB] ( 1292 )

	479	Microstructure and mechanical properties of joint of MGH956 alloy in TIG welding
		Lei Yucheng1,2, Zhao Kai1, Huang Wei1, Liang Shenyong1, Yu Wenxia3
		Tungsten insert gas(TIG) weldings of MGH956 alloy plates with 1.3 mm thickness were conducted with base metal(BM) and self-made high Ni wire as fill materials, respectively. The two kinds of joint microstructures and mechanical properties were compared and analyzed.With high Ni wire as fill material in the process of welding, grain refinement is realized in weld joint with reduced holes, and new composite reinforced phase by TiC is produced in the joint to ensure the joint quality and to reduce the agglomerate of nano-scale reinforced Al-Y-O composite oxide particles. The mechanical testing results show that tensile strength of the sample welded by BM welding is only 57％ of that of BM with softening at weld metal(WM). Hardening appears at WM for filling high Ni wire, and the tensile strength of 581 MPa reaches about 80.7% of that of BM. The two cases of heat affected zone hardness are equal to that of BM, and the fracture surface of two weld joints both exhibit brittle fracture.
		2014 Vol. 35 (4): 479-483 [Abstract] ( 1562 ) [HTML 1KB] [ PDF 2892KB] ( 1110 )

	484	Preparation and catalytic activity of SO42-／Zr-MCM-48 and SO42-／Al-MCM-48 solid acid catalysts
		Jiang Tingshun, Jia Jia, Ma Yan, Wang Qian, Zhao Qian
		Zr(or Al)-MCM-48 mesoporous molecular sieves were synthesized via hydrothermal method, and SO42-/Zr(or Al)-MCM-48 solid acid catalysts were prepared by wet impregnation in H2SO4 solution. The samples were characterized by X-ray diffraction (XRD), NH3 temperature-programmed desorption (NH3-TPD) and N2 physical adsorption. The catalytic activities of solid acid catalysts were evaluated by alkylation reaction of phenol with tert-butyl alcohol. The results show that SO42-/Zr-MCM-48 and SO42-/Al-MCM-48 samples still maintain cubic mesoporous framework of MCM-48. Compared with Zr-MCM-48 and Al-MCM-48 samples, the specific surface areas and mesoporous orderings are slightly decreased. The results of alkylation reaction show that SO42-/Zr-MCM-48 catalyst exhibits much high catalytic activity of phenol conversion and 4-tert-butyl phenol(4-TBP) selectivity, and the maximum phenol conversion of 91.6% is obtained at reaction temperature of 140 ℃.
		2014 Vol. 35 (4): 484-487 [Abstract] ( 1201 ) [HTML 1KB] [ PDF 1673KB] ( 1071 )

	488	Degradation of methylene blue by magnetic field and photocatalysis coupling technology
		Wu Chundu1,2， Jiang Zhihui1， Xie Qingjie1， Zheng Kun1
		To solve the persistent color and nondegradable problem of AZO dyestuff effluent, methylene blue with AZO structure was used to simulate wastewater. The degradation of methylene blue by magnetic field and photocatalysis coupling method was investigated. The effects of TiO2 dosage, magnetic density, initial methylene blue concentration, pH value and reaction time were discussed. The results show that magnetic field can improve the degradation effect of methylene blue. Under the conditions with magnetic density of 250 mT, TiO2 dosage of 1 g?L-1, pH value of 11, initial methylene blue concentration of 10 mg?L-1 and reaction time of 90 min, the removal efficiency of COD and the decoloring rate reach 82.76% and 86.02%, respectively. According to the changes of absorption spectra of methylene blue before and after treatment, the AZO bond and the benzene ring are damaged after light-magnetic degradation method, and most of methylene blue is oxidized and decomposed.
		2014 Vol. 35 (4): 488-492 [Abstract] ( 1638 ) [HTML 1KB] [ PDF 1628KB] ( 1267 )

	493	Homotopic mapping solutions for variable coefficient combined perturbed KdV equation
		Lu Dianchen, Chen Tingting, Hong Baojian
		The homotopic mapping method was used to obtain the approximate solutions with double periodic form of coefficient combined perturbed KdV equations. By functional transformation, the variable coefficient combined perturbed KdV equations were simplified to ordinary line array and combined perturbed KdV equations. Based on Fourier analysis method, the homotopy mapping was introduced to get approximate solutions of Jacobi elliptic function form for original equations under initial conditions. Some solutions could be degenerated to approximate solutions of hyperbolic function form or trigonometric function form in the limit cases. The first approximate solutions and the second approximate solutions of variable coefficient combined KdV equations were obtained under perturbation condition.
		2014 Vol. 35 (4): 493-496 [Abstract] ( 1133 ) [HTML 1KB] [ PDF 1296KB] ( 1250 )

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