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Journal of Jiangsu University(Natural Science Eidtion)

	2017 Vol.38 Issue.5 Published 2017-09-10

	Article

Article

	497	Path tracking control of automatic parking for intelligent vehicle based on nonsmooth control strategy
		JIANG Hao-Bin, Li-Chen-Xu, Ma-Shi-Dian, Ding-Shi-Hong, Zhang-Chao
		Abstract: The low path tracking precision of automatic parking in realtime control was caused by the nonlinear non holonomic constraint characteristics of vehicle, and the number of adjustments in garage was increased with bad vehicle pose. To solve the problems, a control strategy for automatic parking tracking was proposed based on nonsmooth control. The secondorder and the thirdorder limited time tracking equations of subsystem cascade system were deduced by the reducedorder conversion of dynamics tracking error model of vehicle. The path tracking controller with global asymptotic stability characteristics was designed based on the reducedorder equation, and the steering wheel angle of vehicle dynamics model and the vehicle speed were served as inputs to conduct simulation. The results show that compared to traditional approaches, the path tracking control method based on nonsmooth control can achieve global exact tracking reference parking path in limited time with strong antidisturbance and rapid convergence ability.
		2017 Vol. 38 (5): 497-502 [Abstract] ( 873 ) [HTML 1KB] [ PDF 1882KB] ( 1976 )

	503	Construction and simulation of nbutanol／diesel PAHs simplified mechanism
		WANG Zhong, WANG Peng, ZHANG Mei-Juan, QU Lei
		To explore the formation pathway of nbutanol/diesel soot, the processes of nbutanol oxidation and PAHs of benzene, naphthalene, phenanthrene and pyrene were analyzed, and the basic reaction related to PAHs formation of nbutanol/diesel mixed fuel was retained. The oxidation mechanism of nbutanol and the PAHs mechanism were simplified, and the simplification mechanism of nheptane was added to establish the simplification mechanism of nbutanol/diesel PAHs with 73 components and 89 elements. The simplified mechanism was used to simulate the reaction parameters of nbutanol/diesel, and the feasibility of the simplified mechanism was verified. Based on the simulation results, the PAHs generation of nbutanol/diesel and the change rule of yield rate with time were analyzed. The results show that the simulation results are consistent with the experimental results of reflected shock tube. With the increasing of nbutanol blending ratio, the PAHs yield and the generation rate are decreased, and the peak time is postponed with decreased total yield. With the increasing of equivalence ratio, the peak time of PAHs matter is increased, while the peak time is delayed.
		2017 Vol. 38 (5): 503-508 [Abstract] ( 646 ) [HTML 1KB] [ PDF 1964KB] ( 1846 )

	509	Effect of air flow rate on diesel particulate filter regeneration by nonthermal plasma technology
		SHI Yun-Xi, CAI Yi-Xi, WANG Jing, XU Hui, PU Xiao-Yu, GU Lin-Bo
		By nonthermal plasma (NTP) injection system, the regeneration of diesel particulate filter (DPF) was experimented with air as gas source. The effect of air flow rate on DPF regeneration was investigated by observing the flow rates of main active substances of O3 and NO2 and regeneration product of COx during regeneration process. The results show that the active substances of O3 and NO2 are generated through the discharge reaction of NTP reactor and play important role in the decomposition of PM. With the increasing of air flow rate, the mass flow rate of O3 and the volume flow rate of NO2 are increased remarkably, which promotes the decomposition of PM. With the increasing of air flow rate, the mass of C in COx is increased, while the mass of decomposed PM per liter is decreased. When the air flow rate is 185 L·min-1, the mass of C in COx achieves the maximum value, and the DPF regeneration effect is the most significant. When the air flow rate is 50 L·min-1, the mass of decomposed PM per liter shows the maximum value, and air has the highest utilization rate.
		2017 Vol. 38 (5): 509-515 [Abstract] ( 977 ) [HTML 1KB] [ PDF 2009KB] ( 1221 )

	516	Effects of oil pressure on pressure fluctuation of electro liquid variable valve system
		HAN Zhi-Qiang, ZHAO Jia-Hui, QIU Peng, TIAN Wei, HAN Wei-Qiang, XIA Qi
		Hydraulic fluctuation can directly affect the opening and closing characteristics of electrichydraulic type variable valve system and indirectly affect the status data of cylinder gas. The pressure fluctuation and the systematical evaluation parameters were establised based on the working process of electrohydraulic variable valve system for DK4A diesel engine, and the influence of oil pressure from 2.5 to 4.5 MPa on the pressure fluctuation in variable valve system of diesel engine was analyzed by the evaluation parameters. The results show that with the increasing of oil pressure, the characteristic parameters of pressure fluctuation phases(α1α8) are appeared in advance, and the peak pressure of p1 and p2 are increased. The pressure difference and the pressure mutation rate of pressure fluctuation range(β1,β2,β4)are increased, and the pressure mutation rate of range β5 is increased first with latter decreased change. The average value of pressure fluctuation, the fluctuation rate and the fluctuation variance of range β3 are increased. The average value of pressure fluctuation is almost constant with slight change of fluctuation range, and the variance value is increased slowly in the range of β6.
		2017 Vol. 38 (5): 516-521 [Abstract] ( 846 ) [HTML 1KB] [ PDF 2621KB] ( 1243 )

	522	Lightweight on body frame of electric bus
		GAO Jin, AI Tian-Fu, YANG Xiu-Jian, SHEN Lin-Qing, WU Xiang-Ji
		To meet the demand of lightweight for an electric bus, the body frame simulation was ensured with good structural performance under four limit conditions of horizontal bending, ultimate torsion, emergency turn and emergency braking. By sensitivity analysis, the components of chassis frame were obtained to effectively reduce the quality with slight effect on the performance of chassis structure. With the profile thickness as design variables, the minimum total frame quality as goal and the maximum displacement under different working conditions as constraints, the multi objective optimization mathematical model of body frame was established. By response surface method(RSM), the design variables of the thickness values were obtained after the optimization. The model and the structure performance of lightweight body frame under the same conditions were comparatively analyzed. The results show that the strength and the stiffness of body frame can be guaranteed under four limit conditions, and the modal frequency is also within the required range. The total weight of body frame is reduced by 456 kg, which is about 536％ of the total mass.
		2017 Vol. 38 (5): 522-528 [Abstract] ( 761 ) [HTML 1KB] [ PDF 2470KB] ( 1326 )

	529	Structure analysis and orthogonal optimization of automotive radiator based on Flowmaster
		TANG Ai-Kun, QIAO Fang-Fang, WANG Guang-Ji-2, LOU Liu-Sheng, PAN Jian-Feng
		With 1D thermal fluid simulation software of Flowmaster, a model was established based on geometric structures for an automotive radiator and verified by comparing with experimental results to assure the reliability. For the same volume, the orthogonal test method was used to analyze the effects of tube width, tube height, fin height and fin pitch on the heat transfer performance. The optimal structure parameters were determined to improve the heat transfer performance of radiator. The results show that under the optimization conditions with flat tube width of 27.00 mm, flat tube height of 1.50 mm, fin height of 6.25 mm and fin distance of 2.10 mm, the best heat transfer performance of radiator can be achieved.
		2017 Vol. 38 (5): 529-535 [Abstract] ( 834 ) [HTML 1KB] [ PDF 2762KB] ( 1554 )

	536	Parallel computing of pipeline flow based on multiblock collocated grid
		JIANG Guang-Biao, ZHONG Hai, YIN Shui-Ping, CHEN Sheng-Ming
		The partition parallel computing of internal flow for a sudden expansion pipe system division was conducted based on multiblock collocated grid and cluster. By SIMPLE algorithm, the custom partition method of parallel computing was implemented,and the effects of Reynolds number and sudden enlargement ratio on sudden expansion pipe flow structure were analyzed.The cluster parallel computing efficiency was detailedly discussed based on the different custom partition mode and core numeber. The influence of load on calculation efficiency was also analyzed. The results show that grid number, cores and partition way have great influence on cluster computing efficiency. When each grid partition contains the similar grid numbers or with equal load, the high parallel computing efficiency can be achieved.
		2017 Vol. 38 (5): 536-543 [Abstract] ( 551 ) [HTML 1KB] [ PDF 3083KB] ( 1384 )

	544	Effect of nanofluid and dispersant on performance of gravity heat pipe
		WANG Zhu-Liang, DAI Shi-Jia, WANG Hong-Yu, LUO Ming, HUANG Bin, MA Qing
		To investigate the effect of nanofluid and dispersant on the performance of gravity heat pipe, the starting performance (startup time and start temperature) and the heat transfer performance (tube wall temperature distribution at stable state and total thermal resistance) of different heat pipes were determined separately. The results show that the addition and the physical properties of nanoparticles have effects on the startup time of heat pipe. The startup time of heat pipe with nanofluid is 1.3～3.2 min shorter than that of the conventional one with deionized water as working fluid. The addition of dispersant also affects the heat transfer performance of heat pipe. Under the condition of high heat flux, the performance of nanofluid heat pipe with twelve sodium alkyl sulfate (SDS) as dispersant is better than that with arabia gum (AG) as dispersant. The thermal resistance of nanofluid heat pipe with dispersant is significantly decreased by 26.4％～63.9％.
		2017 Vol. 38 (5): 544-548 [Abstract] ( 769 ) [HTML 1KB] [ PDF 1945KB] ( 1414 )

	549	Geometrical parameters optimization of cutting tools based on finite element simulation
		AN Li-Bao, LIU Si-Zhi
		To investigate the influence of geometrical parameters of cutting tools on machining process and surface quality of difficultmachining aircraft materials under dry cutting condition, 2D finite element model for orthogonal cutting process was established, and the dry turning process of GH169 with cubic boron nitride cutting tools was simulated by AdvantEdge FEM software. The effects of rake angle, clearance angle and cutting edge radius on surface residual stress were examined. The comprehensive influence of geometrical parameters of cutting tools on cutting force, cutting temperature and maximum residual tensile stress was analyzed and calculated by matrix analysis method, and the optimal combination of geometrical parameters of cutting tools was obtained. With the optimal parameters combination, the life of cutting tools can be prolonged, and the surface quality of workpiece can be improved.
		2017 Vol. 38 (5): 549-554 [Abstract] ( 1155 ) [HTML 1KB] [ PDF 1550KB] ( 1481 )

	555	Design and implementation of dynamic voltage restorer digital system based on optimal compensation control
		HUANG Yong-Hong, DU Li, GAO Min, ZHOU Jie
		To solve the problems of phase distortion and high active power consumption of traditional compensation control strategy, an optimization compensation control strategy was proposed. The dynamic voltage restorer (DVR) active power size was introduced to optimize the regulation amount of DC side voltage, and the systematic analysis on the compensation characteristics of compensation strategy was conducted. To solve the problems of nonlinear and impact load disturbance of invert output unit, a hybrid cascaded Hbridge multilevel invert topology was established, and the structure and working principle were analyzed. The multilevel DVR digital system including hardware and software was designed. On the Chroma6590 programmable AC power supply, the grid voltage was simulated, and the grid compensation experiment was conducted in the system.The results of simulation and experiment show that the designed DVR compensation effect is very good and can realize the minimum device output active power and prolong time compensation with effectively reduced output harmonic.
		2017 Vol. 38 (5): 555-562 [Abstract] ( 797 ) [HTML 1KB] [ PDF 3322KB] ( 1780 )

	563	Survey of fast correlation attack of stream cipher
		PAN Sen-杉, XIA Wen-Tao, WANG Liang-Min
		To analyze the security of keystream generator for resisting fast correlation attack， the various fast correlation attack algorithms were studied．The basic model of fast correlation attack was introduced, and the related research literatures of fast correlation attack were generalized and analyzed．The advantages and disadvantages of one pass methods，iterative decoding methods and multipass methods were analyzed．The statesoftheart researches on fast correlation attack over extension field and fast correlation attack based on monomial mapping were introduced．The applications of fast correlation attacks and the comparison with other attack methods were discussed．The future research directions were provided with respect to the improvement of methods over extension fields，the algorithms to attack new schemes, the various attack methods to crack schemes and the application of fast correlation attack to other cryptographic scenarios.
		2017 Vol. 38 (5): 563-570 [Abstract] ( 1419 ) [HTML 1KB] [ PDF 1364KB] ( 3030 )

	571	Image compressive sensing reconstruction based on lowrank and total variation regularization
		YANG Guang, FENG Lei, SUN Huai-Jiang, SUN Quan-Sen
		To solve the problem that image compressive sensing reconstruction algorithm via nonlocal lowrank regularization could not adequately exploit the local gradient sparsity, an improved image construction algorithm was proposed based on lowrank and total variation regularization. The similar patches were found by image block matching method and formed into nonlocal similar patch groups. The regularization term of combining lowrank prior of nonlocal similarity patch groups with gradient was embedded into reconstruction model, which was solved by alternating direction multiplier method(ADMM) to obtain the reconstructed image. The test images were gray scale images. To verify the proposed algorithm, the experimental results were compared by subjective vision and peak signaltonoise ratio(PSNR). The experimental results show that compared with the algorithm via nonlocal lowrank, the proposed method can significantly improve the quality of reconstructed image with nonlocal selfsimilar structure precisely described, and the PSNR of reconstructed images is increased about 1 dB in average.
		2017 Vol. 38 (5): 571-575 [Abstract] ( 789 ) [HTML 1KB] [ PDF 1853KB] ( 1344 )

	576	Optimization algorithm of SVM parallel parameters based on GPU
		TANG Mei-Li, ZHANG Jin-Song, LI Lu, MA Ting-Huai
		To shorten the parameter optimization time of support vector machine(SVM) and improve the efficiency of parameter optimization, the optimization algorithm of SVM parallel parameters was proposed based on graphic processing unit (GPU). The parallel possibility was analyzed for grid search (GS) algorithm and particle swarm optimization (PSO) algorithm. Based on GPU, the parallel methods of GS and PSO were proposed. The experiments were executed on GeForce GT 650M GPU card to conduct 5cross validation. The results show that compared with the original optimization algorithms, the proposed parallel optimization algorithm can obtain the same optimum performance with greatly reduced execution time. The speedup ratio can reach 26.85 for parallel PSO algorithm, and the SVM parameter optimization performance is improved greatly.
		2017 Vol. 38 (5): 576-581 [Abstract] ( 1213 ) [HTML 1KB] [ PDF 1843KB] ( 2014 )

	582	Digital watermarking algorithm for color images based on blocks and NSCTSVD
		ZHANG Qian-Qian, ZHAN Yong-Zhao, LIN Han-Yang
		To solve the problems of low watermark capacity and bad robustness of digital watermarking algorithm for color images, a method was proposed based on blocks and NSCTSVD. The color image was divided into three channels of R, G and B, and the three channels were respectively broken down into four nonoverlapping blocks. NSCT was applied to the nonoverlapping blocks for achieving the lowfrequency part of each block, and SVD was applied to every lowfrequency part. SVD was also applied to the three channels of R, G and B of color watermark images. Considering the principle that the robustness and invisibility of watermark could be well balanced, the optimal watermark embedding factor was selected. The singular value of R, G and B of watermark was added to the singular value of lowfrequency part of each block of original image to embed watermark information. The experimental results show that the proposed algorithm has good transparency and robustness for many attacks of noise, filtering, cropping, JPEG compression and rotation.
		2017 Vol. 38 (5): 582-589 [Abstract] ( 614 ) [HTML 1KB] [ PDF 2761KB] ( 1001 )

	590	Construction and optimization of response surface model on ironcarbon microelectrolysis pretreatment parameters
		CHEN Zhi-Gang, YANG Zhi-Di, JIANG Su-Ying, LUO Zhi-Jun, WU Xiang-Yang, ZHANG Bo
		Taking printing and dyeing wastewater as research object, a response surface model was constructed by central composite design method based on a series of single factor experiments. COD and chromaticity removal rate were chosen as evaluation index, and the effects of initial pH value, gas water ratio and reaction time were discussed. Analyzing 3 independent variables and the interaction effects on COD and chromaticity removal rate, the model extreme point was finally determined by combining J. J. Sylvester inequality. The best process factors were determined to optimize the experimental design parameters. The results show that under the optimal conditions with pH value of 2.7, gas water ratio of 14 ∶1 and reaction time of 44 min, COD and chromaticity removal rate can reach 70.19% and 91.32%, respectively. The errors of COD and chromaticity removal rate are respective 3.49% and 2.46%, which means that the proposed response surface model can well illuminate the ironcarbon microelectrolysis pretreatment.
		2017 Vol. 38 (5): 590-595 [Abstract] ( 791 ) [HTML 1KB] [ PDF 5225KB] ( 1454 )

	596	Timeresolved fluorescence immunoassay for determination of dibutyl phthalate in water samples of Zhenjiang city
		ZHU Fang, CHAI Shuai, BIN Jin-Kun, DU Dao-Lin
		As an endocrine disruptor, dibutyl phthalate (DBP) has adverse effects on environment and human health. Using a polyclonal antibody of DBP, a sensitive indirectly competitive timeresolved fluorescence immunoassay(TRFIA) was proposed, and several parameters were investigated. DBP concentration in the rivers of Zhenjiang was determined, and the ecological risk was assessed by risk quotients. The results show that under the optimized conditions, the 50% inhibition concentration (IC50) value of TRFIA is 35.8 ng·mL-1 with limit detection value of 2.4 ng·mL-1 in the detection range from 4.7 to 272.6 ng·mL-1. The developed method shows high selectivity with crossreactivities less than 4.65% to seven structurally related phthalate esters. The recoveries are from 79.85% to 119.20%, and the reproducibilities of intraassay CV are from 5.54% to 9.93% with reproducibilities of interassay CV from 7.27% to 14.01%. The detection rate of DBP in the rivers of Zhenjiang city is 100%, and the concentration ranges from 5.89 to 94.57 ng·mL-1. There exists high ecological risk for DBP distribution in rivers.
		2017 Vol. 38 (5): 596-602 [Abstract] ( 770 ) [HTML 1KB] [ PDF 1976KB] ( 1301 )

	603	Development of a novel fluorescent probe for thiophenol with high selectivity
		HAN Zhi-Xiang, WANG Chun-Liu, ZHU Bo-Song, CAI Chun-Xiang, JIANG Meng-Yun
		A DNS appended 2aminocoumarinbased fluorescent probe 1 was designed for the detection of thiophenol in aqueous solution and living cells. The results show that in the absence of thiophenol, the solution shows none fluorescence. Adding thiophenol, the significant fluorescence enhancement is occurred and accompanied with dramatic fluorescence color of yellowgreen. When the equal equivalent amount of thiophenol is added, the fluorescence intensity can be increased 47 times. Probe 1 shows good linearity with R2 of 0.989 9 for thiophenol when the concentration ranges from 0 μmol·L-1 to 10.00 μmol·L-1, and the detection limit can reach 0.46 μmol·L-1. The probe also shows high selectivity and excellent sensitivity to thiophenol. The probe is successfully used in living cells for thiophenol visual detection by fluorescence imaging.
		2017 Vol. 38 (5): 603-607 [Abstract] ( 896 ) [HTML 1KB] [ PDF 1846KB] ( 1404 )

	608	Adaptability of asphalt pavements to high temperature and large temperature difference in southern Xinjiang
		ZHAO Xue-Ying, SHEN Ai-Qin, MA Bao-Fu
		To analyze the adaptability of asphalt pavements to high temperature and large temperature difference in southern Xinjiang and control distresses due to high temperature, the STR1 commonly used in Xinjiang, STR2 and STR3 used in other areas in China were selected. The temperature fields and the loadtemperature coupled fields were simulated under the condition of 4th July, 2008. The results show that compared with air temperature， the structural temperature shows obvious timelag with the increasing of depth. The thick asphalt surface course can effectively reduce the temperature influence on base course. The simulation results of loadtemperature coupled fields shows that the STR3 with compound base course has the best adaptability to high temperature and large temperature difference in southern Xinjiang.
		2017 Vol. 38 (5): 608-614 [Abstract] ( 814 ) [HTML 1KB] [ PDF 2407KB] ( 1166 )

	615	Value of compressive resilient modulus of asphalt mixture in surface layer
		ZHOU Xue-Yan, MA Biao, TIAN Yu-Xiang, WANG Xiao-Qing
		The value of compressive resilient modulus of asphalt mixture is closely related to the material mechanics performance. The database of modulus was established by collecting the existed module data. Using normal distribution method, the modulus representative value was obtained under different condition. The comparative analysis results show that the change relationship among asphalt type, temperature and asphalt content representative value is basically in line with the existing research conclusions, and the representative value has good veracity and representation. The modulus prediction equation was achieved by fitting regression method. The verifying result shows that the established polynomial curve built has high fitting accuracy and reproducibility.
		2017 Vol. 38 (5): 615-620 [Abstract] ( 1704 ) [HTML 1KB] [ PDF 2029KB] ( 3042 )

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