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Journal of Jiangsu University(Natural Science Eidtion)

	2014 Vol.35 Issue.1 Published 2014-01-10

	Article

Article

	1	Kinetic model and simulation of PAHs formation pathway of methanol/diesel
		WANG Zhong, ZHAO Yang, LI Ming-Di, WANG Xiao-Zhe
		Based on the mechanisms of methanol/ diesel oxidation and PAHs formation， the kinetic model of methanol/diesel with 228 species and 1 584 reactions was established. The PAHs formation process of methanol/diesel was investigated by reflectedshock tube and homogeneous zerodimensional reactor in CHEMKIN software. The results show that the reaction temperature, the mole fraction profiles of methanol, the reaction products of CO, CO2, O2, and the ignition delay can be reasonably predicted by the model. Singlepropynyl phenyl is mainly formed through polymerization, cyclization reaction and hydrogenation reaction. Habstraction acetylene addition mechanism and selfcombination reaction of aromatics are the main routes for polycyclic aromatic formation. The PAHs content decreases with the increase of methanol mixing proportion. The yield of PAHs precursors of C2H2 and C3H3 decreases with the decrease of mixture equivalence ratio.
		2014 Vol. 35 (1): 1-6 [Abstract] ( 1474 ) [HTML 1KB] [ PDF 2345KB] ( 1567 )

	7	Development of SCR post-processing controller of diesel engine
		LIU Chuan-Bao, YAN Fu-Wu
		To match the heavy diesel engine with selective catalytic reduction (SCR) postprocessing system， the SCR postprocessing system controller was developed. SCR controller hardware was designed based on advanced chip MC9S12XEQ512 to realize performance test. The control strategy of SCR system was investigated in detail. Using the downstream NOx concentration and exhaust gas mass flow measured by NOx sensor and flowmeter as expected output, the raw NOx emission model was established with a teacher of BP neural networks for target diesel engine. Based on the BP model AdBlue dosing control strategy under steady state conditions, the heat hysteresis correction algorithm of catalyst substrate and the NH3 leak control strategy were proposed under transient operation conditions. The test results show that the proposed SCR control strategy has good robustness under transient conditions with NOx conversion ratio of 60% and maximal NH3 leak quantity less than 2.5×10-5. Using the proposed controller in target engine, the ESC and ETC test validation shows that the heavy duty diesel engine can satisfy China-Ⅳemission regulations.
		2014 Vol. 35 (1): 7-13 [Abstract] ( 2097 ) [HTML 1KB] [ PDF 3589KB] ( 1948 )

	14	Effect of leakage on working process of micro freepiston engine
		BAI Jin, WANG Qian, XIE Qiang, ZHANG Peng-Gang
		In order to investigate the effect of leakage on the working process of micro freepiston engine, the singleshot visual experiment of homogeneous charge compression ignition (HCCI) in micro freepiston engine was carried out to obtain different ignition characteristics under different leakage conditions. The multidimensional model with chemical dynamic and piston dynamic was established to simulate the process of HCCI. The results show that mixed gas leakage has slight effect on ignition time, while the leakage has severe effect on piston movement characteristic. Due to leakage, the pressure in the micro combustion chamber and the piston speed in the expansion process decrease with decreased performance of micro engine. The leakage gap and length are the main effect factors on the extent of gas leakage and the micro HCCI combustion processes. The larger the leakage gap is, the smaller the maximum pressure and the piston final velocity are, and the power performance becomes worse. With the increasing of leakage length, the maximum pressure increases to improve the power performance. During the research and design process of micro engine, attention should be paid to the sealing effect between cylinder and piston.
		2014 Vol. 35 (1): 14-19 [Abstract] ( 1375 ) [HTML 1KB] [ PDF 2957KB] ( 1435 )

	20	Development and experiment of layered magneto-rheological torque transmission devices
		LI Guo-Fa, ZHAO Pu, LIU Chang, GAO Wei, DAN Cui-Yun, ZHANG Ji-Yuan
		In order to increase the torque output range and the stability of magnetorheological fluid devices, a layered magnetorheological torque transmission device was investigated. Due to the device, the area of shearing force was increased, and the output torque was increased when the shearing force was constant. In the case of a constant output torque, the load per unit area was decreased by adding the number of layers to ensure driven disk rotor not distorted and broke by excessive force. The rheological mechanism and the performance of magnetorheological fluids were investigated to establish LMTTD torque transmission model and perform related mathematical model. By ANSYS finite element method, the LMTTD simulation analysis and structural optimization design were conducted to ensure the feasibility of theory. A performance testing platform was built to realize the torque output performance experiment. The result shows that compared with unlayered devices, the proposed device can increase output torque exponentially.
		2014 Vol. 35 (1): 20-24 [Abstract] ( 1173 ) [HTML 1KB] [ PDF 2041KB] ( 1247 )

	25	Deformation analysis of upstream pumping mechanical seals based on one-way fluid-solid coupling
		CHEN Hui-Long, LIU Yu-Hui, ZHAO Bin-Juan, LIU Tong, WANG Qiang, LIU Zhi-Bin
		The threedimensional geometric model of the rotating ring was established by Pro/E software. The liquid film pressure achieved from Fluent software was imported into Ansys Workbench as boundary condition of rotating ring for oneway fluidsolid coupling calculation. The comparison analysis of carbongraphite, SiC, WC and structural steel was carried out by finite element method under different operating conditions. The results show that the maximum deformation occurs at the end of spiral groove in the rotating ring, while the maximum stress occurs on the back stairs of the moving ring seal. The maximum deformation and stress are almost not affected by the rotating speed, but influenced obviously by the media pressure with linear increasing trend. Carbongraphite is not suitable as moving ring material, and on condition that it meets other requirements, the SiC is proior material.
		2014 Vol. 35 (1): 25-28 [Abstract] ( 1461 ) [HTML 1KB] [ PDF 1822KB] ( 1151 )

	29	Theoretical derivation and numerical simulation of instantaneous flow rate for pillar pump
		KONG Fan-Yu, HE Yu-Yang, SHAO Fei, ZHANG Hui
		In order to investigate the characteristic of instantaneous flow rate of pillar pump, the calculating model was proposed to deduce the formulation of instantaneous flow rate. Based on shear stress transport turbulent (k-ε) model, the numerical simulation of the transient flow field of pillar pump was performed by dynamic mesh method and user defined function. The results show that the pulsation is periodic in the instantaneous flow rate of pillar pump, and the theoretical derivation is consistent with the numerical simulation with a period irregular vibration in every cycle in the numerical simulation. For the hysteresis of outlet position, a closed volume is generated with rapid increasing of pressure. The vibration of the pressure is generated by the abrupt increasing of pressure in valve plate. Beside the parameters of the pump, the corner of port plate is an important influencing factor on the instantaneous flow rate of pillar pump.
		2014 Vol. 35 (1): 29-33 [Abstract] ( 1749 ) [HTML 1KB] [ PDF 1836KB] ( 1200 )

	34	Experiment of subsioling draught under different soil physical properties
		LI Xia, ZHANG Dong-Xing, ZHANG Rui, CUI Tao
		In order to explore the subsioling draught and soil properties under different soil conditions, the comparison of field subsioling experiments was carried out between yellow clay soil in Xinzhou, Shanxi province and light loam in Gu′an, Hebei province. Soil bulk density, compactness and soil profiles were measured and compared before and after deep ripping operations. The experimental results show that the soil bulk density and compactness of light loam are less than those of yellow clay soil before deep ripping operation. The bulk densities of light loam and yellow clay are changed from 1.59 g·cm-3 to 1.30 g·cm-3 and from 1.62 g·cm-3 to 1.27 g·cm-3 after ripping operation， respectively. After deep loosening, the average decrease ratios of compactness are 9% and 11% for Gu′an soil and Xinzhou soil， respectively. In the cases of 30 cm and 40 cm subsoiling, the traction resistance decrease percents of light loam are 61% and 47% less than those of yellow clay soil， respectively.
		2014 Vol. 35 (1): 34-39 [Abstract] ( 1451 ) [HTML 1KB] [ PDF 2676KB] ( 1452 )

	40	Simulation analysis of cavitation performance for spade soil opener based on discrete element method
		JI Yu-Jie, YU Miao, LI Cheng-Hua
		The cavitation performance of spade soil opener was investigated by discrete element method(DEM) to discuss the soil dynamic breaking process of spade soil opener. The twodimensional DEM analyzing models of soil opener and soil granules were built respectively. The working process of the soil opener was simulated based on the proposed twodimensional DEM analyzing models through a reasonable mechanical model. The simulation results show that with the increasing of working speed, the disturbance of soil increases obviously with worse backflow covering effect of soil. With the increase of soil moisture content, the soil reunion phenomenon becomes obvious with decreased soil liquidity.The simulation results are consistent with those of theoretical analysis.It is feasible to analyze the performance of spade soil opener by the proposed DEM.
		2014 Vol. 35 (1): 40-43 [Abstract] ( 1582 ) [HTML 1KB] [ PDF 1798KB] ( 1232 )

	44	A new method for rupture of chlorella vulgaris and extraction of lipid
		LI Liang, LI Yang-Yang, HUANG Yuan-Xing, SONG Cui-Hong, CHENG Hao-Qi
		In order to investigate the rupture method of algae cells, a new method of pressure assisted by ozonation for the rupture of chlorella vulgaris and extraction of lipid was proposed. The effects of pressure and other physical factors on the oil extraction were also discussed. The experimental results show that the algae cells are obviously broken under the maximum pressure of 0.8 MPa and 80 cycle times, and the total nitrogen is increased by 68 mg·L-1with total phosphorus increased by 12.7 mg·L-1. The maximum yield of 26.7% is obtained under the conditions of 0.6 MPa and 80 cycle times. The results of GCMS show that the product is mainly composed of C16∶0 and C18∶0.
		2014 Vol. 35 (1): 44-49 [Abstract] ( 1659 ) [HTML 1KB] [ PDF 1518KB] ( 1600 )

	50	Comprehensive fidelity evaluation for visual simulation based on catastrophe theory and trapezoidal fuzzy numbers
		LIANG Hong-Tao, KANG Feng-Ju, DI Nan-Nan
		To solve the difficulty of giving consideration to fuzziness and subjectivity in fidelity evaluation of ocean visual simulation, a novel method was proposed based on catastrophe theory and trapezoidal fuzzy numbers. According to the establishment principles of visual simulation and marine battlefield environment characteristics, a set of quantitative and qualitative indicators with 4-level were established. The catastrophe theory dynamic comprehensive decisionmaking model was proposed based on trapezoidal fuzzy numbers. The trapezoidal fuzzy numbers were used to initialize the lowestlevel indicators, and the normalization formula of catastrophe theory was used to determine the weight of the corresponding indicator. The proposed model was applied in three typical ocean battlefield simulation system. The experimental results show that the ocean visual simulation fidelity assessment can be reasonably and correctly realized by the proposed method to provide a new perspective for multiple attribute decisionmaking in large and complex systems.
		2014 Vol. 35 (1): 50-55 [Abstract] ( 1215 ) [HTML 1KB] [ PDF 1601KB] ( 1641 )

	56	Microarray data classification based on evolutionary learning hypernetwork
		WANG Jin, HUANG Ping-Li, SUN Kai-Wei, CAI Tong
		In order to solve the shortcoming of relatively complicate and barely intelligible classification result of most conventional machine learningbased pattern recognition method, an evolutionary learning hypernetwork evolved by a genetic algorithm was proposed. Differed from the traditional hypernetwork based on a gradient descent or a hyperedge replacement scheme as system learning machine, a genetic algorithm was employed in the learning process of the proposed evolutionary learning hypernetwork. In the system learning process, the hyperedges of hypernetwork were divided into several subgroups for the individuals to be evolved independently with selection, crossover and mutation operations. The outstanding individuals were migrated to the neighbor subgroup in every generation. Every subgroup was evolved with genetic algorithm parallel, and eventually contributed to a hypernetworkbased classifier with the ability of decisionmaking. The evolved hypernetwork was used to classify the data set of acute leukemia, lung cancer and prostate. The experimental results show that the proposed approach leads to a very comparable classification performance with data set accuracies of 96.21% on acute leukemia, 99.26% on lung cancer and 96.09% on prostate, respectively. The learning results of the proposed hypernetwork are more readable than those of other traditional classification methods. The proposed scheme can efficiently discover significant high order interactions of gene pairs for cancer classification.
		2014 Vol. 35 (1): 56-62 [Abstract] ( 1563 ) [HTML 1KB] [ PDF 2159KB] ( 1270 )

	63	Scheduling of bottleneck workstation in wafer fabrication systems based on improved multiobjective particle swarm optimization algorithm
		ZHOU Bing-Hai, HU Xin-Yu, SUN Chao
		To maximize the utilization of bottleneck workstation and achieve a high throughput with a reasonable cycle time, an improved multiobjective particle swarm optimization algorithm (IMOPSO) was proposed with an objective function to minimize the total flow time and the weighed average time of earliness and tardiness. The performance of the bottleneck workstation was analyzed. A multiobjective optimization model was built based on the mapping requirements of rapid productions as total flow time and just in time delivery as weighed average time of earliness and tardiness of the bottleneck workstation. An IMOPSO algorithm was established for the scheduling of bottleneck workstation by improving an update mechanism of velocity and position with a crossover operation to the particle falling into local optimum. Based on stability, quality, convergence rate and run time, the simulation experiments were performed to evaluate the proposed algorithm under the conditions of different job scales. The results show that the proposed algorithm is valid and feasible to improve the scheduling performance of bottleneck workstation.
		2014 Vol. 35 (1): 63-68 [Abstract] ( 1282 ) [HTML 1KB] [ PDF 1550KB] ( 1361 )

	69	An algorithm for rapid noncoding RNA sequence-structure alignment
		SONG Jia, XU Li, SUN Hong
		In order to improve computational efficiency of the noncoding RNA sequence search software, the alignment results of family members and the covariance model were analyzed. The length distribution of secondary structure of ncRNA was introduced to propose the structure unit length limit algorithm. Based on the length distribution of structure unit in the secondary structure, the numbers of insertion and deletion during the evolution were restricted. The computer program of the proposed approach was completed by C++, and the performance was tested by searching a few ncRNAs in genomes. The experimental results show that compared with the CMbased search, the new model can significantly speed up the searching of ncRNAs in genomes with comparable search accuracy to that of covariance CMbased approach. The speeding up by the new model is significant for the sequences with a large number of nucleotides. The searching speed of the new approach is 90.76 times faster than that of CMbased search algorithm on Lin_4 with the same search accuracy in terms of sensitivity and specificity.
		2014 Vol. 35 (1): 69-74 [Abstract] ( 1104 ) [HTML 1KB] [ PDF 1553KB] ( 1148 )

	75	MPPT control based on duty cycle perturbation and observation method
		CAI Ji-He, SUN Yu-Kun, HUANG Yong-Hong
		To solve the maximum power point shift of PV array caused by nonlinear and timevarying of PV grid connected system, a MPPT control algorithm was proposed based on duty cycle perturbation and observation method. Based on the equivalent circuit of PV array, it was determined when the PV array could obtain the maximum power. The process of maximum power point tracking, the structure of the PV grid connected system and the realization of MPPT were also discussed. The principle of MPPT control was analyzed, and the simulation was completed with Matlab. The results show that the method has a better antiinterference ability than duty cycle constant voltage MPPT method. The proposed method has a simple control structure with good suitability for engineering applications.
		2014 Vol. 35 (1): 75-79 [Abstract] ( 1401 ) [HTML 1KB] [ PDF 1709KB] ( 1570 )

	80	Numerical simulation and analysis of structural parameters of ferromagnetic pole pieces in magnetic gears
		YANG Chao-Jun, LI Zhi-Bao, ZHOU Yue-Hua, HU You, YANG Qiao-Rong
		In order to improve the torque transmission ability of magnetic gear, the magnetic field modulation mechanisms and structure requirement were investigated to propose three kinds of structure of ferromagnetic pole pieces. To improve the torque transmission capacity of stacked structure of ferromagnetic pole pieces, the structural parameters of ferromagnetic pole pieces were analyzed numerically by the finite element method. The results show that the output torque of magnetic gear increases firstly and then decreases with the increase of the relative teeth width of the ferromagnetic pole pieces. The output torque is large when the relative teeth width is between 0.4 and 0.5, and the torque change is relatively stable. The output torque increases firstly and then decreases with the increase of tooth height of ferromagnetic pole pieces. The maximum of output torque is obtained with the tooth height of 3 mm, and the output torque increases by 18% more than that of simulation result of experimental. The output torque decreases with the increasing of connecting bridge height, and the torque increases by 62% more than that of simulation result of experiment without connecting bridge.
		2014 Vol. 35 (1): 80-86 [Abstract] ( 1556 ) [HTML 1KB] [ PDF 4336KB] ( 1461 )

	87	Ni(P)-Sn interface diffusion on surface of magnesium alloy
		GE Xiao-Lan, MA Hong-Tao, CHEN Zhi-Chao, WANG Cai-Jun, ZENG Bing
		Ni(P) chemical plating and pure tin hot dipping were used to coat the surface of AZ91D magnesium alloy to prepare Ni(P)-Sn doublelayer coating film. After 2 hours of thermal diffusion treatment at 220℃, the structure and corrosion properties of the interface of clad layer were analyzed. Scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used for interface structure detection and elemental analysis. Xray diffraction (XRD)was used to investigate the surface phase structure of the Ni(P)-Sn coating film, and polarization curves were used to study the corrosion resistance of the coating film before and after thermal treatment. The results indicate that the Ni-P layer with continuous distribution along the interface can efficiently prevent the diffusion of Sn into Ni layer. The Ni3Sn4 phase floats in Sn layer with blockshape to destruct the single phase of coating film and cause the reduction of decay resistance after thermal treatment.
		2014 Vol. 35 (1): 87-90 [Abstract] ( 1535 ) [HTML 1KB] [ PDF 1804KB] ( 1194 )

	91	Property experiments of solid lubrication of laser texturing surface
		HUA Xi-Jun, LIU Ming, DU Zhi-Hua, WU Jin-Quan, FU Yong-Hong
		The micro-dimples morphology was processed on the surface of 45# steel by the laser surface texturing and then filled with MoS2. The UMT-2 multifunctional friction and wear testing machine was used to investigate the friction and wear characteristics under different load and dimple density. The wear tracks of the samples were observed by scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS). The test results show that the lubrication properties of surfaces can be improved effectively by the technology of solid lubrication and laser surface texturing. Compared to untextured surfaces, the friction coefficient of textured surfaces is decreased significantly. In a certain range, with the increasing of dimple density, the friction coefficient is reduced, and the wearresistant and antiabrasion performance are improved significantly with optimum dimple density of 19.6%~30.0%. The solid lubricant was coated to the sample surfaces from the dimples during the friction process to form solid lubricating film stably and reliably.
		2014 Vol. 35 (1): 91-95 [Abstract] ( 1293 ) [HTML 1KB] [ PDF 2666KB] ( 1370 )

	96	Performance of lowyieldstrength steel shear panel damper with function separate
		ZHANG Chao-Feng, ZHANG Zhi-Sheng, WU Mei-Ping, CAO Yi
		To develop function separate dampers with large deformation and high energy absorption, the frame fixture was applied to design lowyieldstrength steel shear panel damper (LYSPD). The effects of link strength and length of frame fixture on the performance of lowyieldstrength steel shear panel (LYSP) were investigated. The static hysteretic incremental experiments were used to determine the stress concentration factor of dampers. By image processing techniques, the shear strain of shear panel was employed to analyze the failure process of LYSP. The experimental results show that the frame fixture with enough link strength and large link length can effectively reduce the strain concentration factor and markedly improve the deformation capacity and energy absorption of the damper.
		2014 Vol. 35 (1): 96-100 [Abstract] ( 1220 ) [HTML 1KB] [ PDF 1809KB] ( 1599 )

	101	Analysis of 1-D large strain consolidation for soft clay with exponential flow law
		LI Chuan-Xun, XU Chao, MIAO Yong-Hong
		According to the exponential flow law for soft clay and the constant coefficients of compressibility and permeability during consolidation, the equations and solution conditions of onedimensional large strain consolidation were established in Lagrangian coordinates with excess pore water pressure as variable. The computation module was solved by finite difference method to obtain the numerical solutions for pore water pressure. The numerical solutions of void ratio with different depth and settlement of foundation at certain time were solved, and the average consolidation degrees in terms of deformation and stress were both provided. The influence of exponent m on large strain consolidation behavior was analyzed by numerical examples. The difference of consolidation theory with exponential flow law between small strain and large strain was analyzed, and the condition that large strain must be considered in onedimensional consolidation of soft clay with exponential flow law was provided.
		2014 Vol. 35 (1): 101-106 [Abstract] ( 1227 ) [HTML 1KB] [ PDF 2275KB] ( 1127 )

	107	Deformation behavior and elastic modulus of engineering materials based on compressive rod post-buckling
		JIANG Song, SHI Xiao-Yan, ZENG Xin-Xin, XU Bin
		The end bending angles and the middlepoint deflections of eight engineering materials were analyzed by a scanner. The elastic modulus of samples were tested based on compressive rod postbuckling by TA-XT2i Texture Analyzer, and the results of 65Mn steel were compared with those by threepoint bending method. The results show that the deformation behaviors of eight materials are consistent with theoretical calculations, and the errors of middlepoint deflection are below 5％ with the errors of end bending angles below 6％. The experimental results of elastic modulus of metal sheets are all in good agreement with the nominal values, and the method based on compressive rod postbuckling is better than that based on threepoint bending. The proposed method is suitable for measuring elastic modulus of engineering materials. The optimum end bending angle of the method is 20°～25°, and the optimum thickness and length of metal sheets are 0.2～03 mm and 150～180mm, respectively. The optimum length of PVC sheets with thickness of 038mm is 180mm, while the optimum length of PET sheets with thickness of 0.5mm is 80mm. The optimum length and width of art paper are 100mm and 30mm, respectively. The optimum length and thickness of bamboo are 180mm and 1.0mm, respectively.
		2014 Vol. 35 (1): 107-114 [Abstract] ( 1216 ) [HTML 1KB] [ PDF 1494KB] ( 1095 )

	115	Dynamics of microcystin-LR and COD degradation in water by catalytic ozonation
		LIU Hong, HUANG Kai, LI Xin-Jian, YI Cheng-Wu, SONG Jin-De
		The degradation of MicrocystinLR (MC-LR) and COD was conducted by catalytic ozonation, and the reaction kinetics were investigated by direct substituting and dynamics differential methods. The results from direct substituting method indicate that the MC-LR degradation reaction fits well with secondorder kinetics, while COD degradation reaction fits well with firstorder kinetics. The results from dynamics differential method are consistent with the conclusions. The factors of temperature, ozone dose and pH value have influence on the degradation rate. Temperature has slight effect on the degradation rates of MC-LR and COD. Ozone dosage has significant effect on the degradation of MC-LR and COD, and the degradation rate constant is obviously increased with the increase of ozone dosage. The degradation rate is also sensitive to pH value, and the rate is quickly decreased under alkaline condition.
		2014 Vol. 35 (1): 115-119 [Abstract] ( 1643 ) [HTML 1KB] [ PDF 1652KB] ( 1301 )

	120	Preparation of chitosan nanoparticles with fissuaring structure by inverse miniemulsion crosslinking method
		LI Ye-Ping, XU Yun, CHENG Xiao-Nong, WU Shi-Long, LIU Hong-Fei
		In order to prepare a new sustained and controlled release drug carrier, the chitosan nanoparticles were prepared by inverse miniemulsion crosslinking technique with vacuum dehydration treatment. The mixture solution of paraffin and hexane was used as oil phase with chitosan solution as aqueous phase, Span-80 as emulsifier and glutaraldehyde as crosslinking agent. The characteristics of the chitosan nanoparticles were determined by particle diameter distribution, SEM, FT-IR, TG and DSC. The results show that the nanoparticle size is decreased with the increasing of shear rate and content of crosslinking agent. With the increasing of the emulsifier content, the nanoparticle size is rapidly decreased at first with later slight increasing. The nanoparticle size is small when the volume ratio of oil to water in the range of 3∶2~2∶3. SEM confirms that the chitosan nanopartices have fissuaring structure and good dispersion with particle size from 100 nm to 300 nm.
		2014 Vol. 35 (1): 120-124 [Abstract] ( 1102 ) [HTML 1KB] [ PDF 2373KB] ( 1445 )

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