Journal of Jiangsu University(Natural Science Eidtion)

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Journal of Jiangsu University(Natural Science Eidtion)

	2018 Vol.39 Issue.1 Published 2018-01-09

	Article

Article

	1	Analysis of AFS based on car navigation electronic map
		LIU Jian-Guo, LIU Si-Jian, FU Heng
		To solve the problems of lagging and imprecise in AFS system algorithm during facing the curve, the Stype road or transition curve, a new PAFS algorithm was proposed. The car navigation electronic map information was effectively used to control the deflection angle of headlights by vehicle speed and road curvature. Combining the bulb 5 lxisolux enveloping line, the starting time of AFS was determined. Adopting the improved genetic algorithm, the PID parameters were set, and a joint simulation model of the whole system was established by Carsim and Simulink software. The simple road model and the actual road model were simulated and compared with the traditional algorithm results. The results show that the PAFS algorithm can effectively solve the lagging question in traditional AFS algorithm with improved control accuracy.
		2018 Vol. 39 (1): 1-6 [Abstract] ( 1504 ) [HTML 1KB] [ PDF 1838KB] ( 1391 )

	7	Numerical simulation of PCCI combustion in diesel engine with different injection timing
		MEI De-Qing, TU Li-Zhi, JU Zhi-Xuan, JIANG Shi-Yang, WANG Xiang-Li, YUAN Yin-Nan
		The combustion process in a singlecylinder turbocharged diesel engine with pilotpilotmain injection strategy was simulated by the computational fluid dynamics(CFD) software. The effects of injection timing on combustion process, NO generation and soot were analyzed in detail. The results show that when the injection timing is retarded, the incylinder pressure is decreased gradually with reduced main heat release peak, and the position of heat release peak moves far away from the top dead center with increased premixed combustion fraction to show more apparent feature of low temperture PCCI combustion mode. For 10％ heat release (q10) with retarding of fuel injection timing, the soot generation is decreased as the lean premixed combustion takes the major, while more NO is generated due to the rapid heat release of premixed mixture. For 90％ heat release (q90), NO emission is decreased due to the total low temperature effect in cylinder, while the soot is increased with latter decreasing due to the extended combustion space and the high premixed combustion fraction. The favorable tradeoff between NO and PM emissions can be well compromised in a diesel engine with the low temperature PCCI mode.
		2018 Vol. 39 (1): 7-13 [Abstract] ( 760 ) [HTML 1KB] [ PDF 3534KB] ( 1431 )

	14	Vehicle navigation map matching algorithm based on multipleattribute integration strategy
		TENG Zhi-Jun, QU Zhao-Qiang, GUO Su-Yang, YU Ming, FU Rao, JING Zi-Jian
		The present direct projection algorithm is often used in embedded vehicle system, while the timeliness and accuracy can not meet the increasingly complex urban road network. To solve the time consuming problem of complex road in traditional retrieval algorithm, a matching algorithm for vehicle navigation map fusion strategy was proposed based on multi attribute matching algorithm to improve the efficiency of embedded vehicle map. The equal step block strategy was adopted for building block grid index to reduce screening candidate regions and improve the algorithm efficiency. The direct projection algorithm based on weight was improved by the introduction of vehicle speed and history matching degree, and the multiple attribute fusion strategy was used to determine the matching algorithm of weighting factor and improve the map matching accuracy. The experimental results show that the map matching algorithm can quickly and accurately match the driving path, and the single point matching time is reduced to 15 ms with accurate rate more than 90％ under complex roads. The proposed algorithm is suitable for the complex city road network.
		2018 Vol. 39 (1): 14-18 [Abstract] ( 631 ) [HTML 1KB] [ PDF 1592KB] ( 1499 )

	19	Modeling and simulation of parking space allocation in stereo garage
		LIU Ri, LI Jian-Guo, WANG Xiao-Nong
		To solve the low access efficiency problem of automatic parking garage with high operational energy consumption, the range of residence time was predicted using support vector machine (SVM) to ensure the operating efficiency of the garage.Based on the theory of polychromatic sets and with vehicle quality, vehicle residence time range and parking energy consumption as features, the space partition management was completed.On the basis, the garage operation model was established,and the model was verified with average waiting time and average energy consumption as output results.Using MATLAB to write simulation program, the validity of parking space management for reducing energy consumption of the garage was analyzed by comparing the results of the parking spaces with those of parking spaces nearby distribution. The simulation results show that the proposed partition management strategy can effectively reduce operating energy consumption by 9% of 5.10 kJ,and the operating efficiency of garage is ensured.
		2018 Vol. 39 (1): 19-25 [Abstract] ( 1359 ) [HTML 1KB] [ PDF 1956KB] ( 1472 )

	26	Analysis of vehiclewandering testing system
		HE Yao-Hua, WEI Le-Wen
		The twodimensional measuring method of vehicle driving wandering was proposed based on the laser ranging, and the testing principle and the general structure scheme were investigated. The possible influencing factors on testing error were analyzed, and the method for reducing testing error was discussed. Based on the actual need of online testing of offline vehicles, the system hardware and software were designed, and the online automatic testing system was developed. The test error was reduced by the improved test method and the hierarchical processing of test data, and the logical control of test points to the system was used to meet the demand of industrial test site with high precision, high strength, high efficiency and multitask test. The results show that the system with noncontact measurement method can realize automatic, accurate and rapid measurement of vehicle driving wandering. The test error of the system is less than 2 cm, which can meet the requirements of automobile manufacturer′s wandering detection.
		2018 Vol. 39 (1): 26-31 [Abstract] ( 1541 ) [HTML 1KB] [ PDF 3540KB] ( 1413 )

	32	Numerical simulation on particle deposition in flue gas flowing across spirally corrugated tubes in aligned arrangement
		WANG Ying-Hui, SHENG Lin-Hong-Yi, GUI Ke-Ting, SHI Ming-Heng
		To investigate the particle deposition in flue gas on the surface of spirally corrugated tubes, the numerical simulation was carried out by discrete phase model and userdefined function of particles deposition model to predict gassolid two phase flow across spirally corrugated tubes. The particle deposition rate and the difference between bare tubes and spirally corrugated tubes were analyzed and discussed. The effects of gassolid two phase flow parameters and tube bundles configuration on the particle deposition rate were also investigated. The results show that compared to the bare tubes， the deposition rate for spirally corrugated tubes is decreased by about 5% when the gas flow velocity is in the range from 7 to 10 m·s-1. However, when the flue gas flow velocity is beyond 10 m·s-1, there is no obvious difference between spirally corrugated tubes and bare tubes. The deposition rate is increased with the increasing of particle diameter and particle concentration in flue gas. The deposition rate is proportional to longitudinal space and inversely proportional to transverse space, pitch and groove depth. The effects of transverse space and pitch on the particles deposition rate are more obvious than that of groove depth.
		2018 Vol. 39 (1): 32-37 [Abstract] ( 928 ) [HTML 1KB] [ PDF 1879KB] ( 1006 )

	38	Design and experiment on combined digging shovel of Panax notoginseng harvester
		ZHANG Dan, ZHANG Zhao-Guo, CAO Yong-Hui, WANG Fa-An
		To solve the soil heap problem before digging shovel of Panax notoginseng mechanical harvesting,a new type of combined digging shovel with triangular plane shovel and soil crushing shovel was designed and investigated under the premise of not reducing harvest rate.The regression analysis and the response surface analysis were conducted by DesignExpert 8.0.6 Software.The structure and the optimum working parameters of the combined digging shovel were determined with shovel surface angle of 20°, buried gap angle of 12° and operation speed of 0.75 m·s-1. The results of field experiment show that the yield rate is 98.38％, and the correctness of regression model is verified to meet the operation requirements. The harvest effect comparison of the combined digging shovel with the common digging shovel shows that the combined digging shovel is more suitable for Panax notoginseng harvesting with better performance of harvest rate and problem solving of soil heap before digging shovel.
		2018 Vol. 39 (1): 38-44 [Abstract] ( 936 ) [HTML 1KB] [ PDF 2990KB] ( 1260 )

	45	Application of α-amylase inhibitor from white kidney beans on instant porridge with low GI
		MA Yan-Li, RANG Yi-Feng, ZHAO Wei, YANG Rui-Jin
		With starch hydrolysis rate as index,the inhibiting effect of α-amylase inhibitor( α-AI) from white kidney beans on starch hydrolysis was investigated.The effect of α-AI on the commercially available instant porridge with high different glycemic index（GI） was analyzed. The results show that with the increasing of αAI addition in rice porridge from 0% to 5%, the GI of rice porridge is continuously decreased from 86.63 to 32.03. The GIs of three instant porridges of oat porridge, barley porridge and lotus seed porridge are all decreased lower than 55 for adding 3% α-AI, which indicates that these types of porridge belong to low GI food.
		2018 Vol. 39 (1): 45-48 [Abstract] ( 1059 ) [HTML 1KB] [ PDF 1464KB] ( 1686 )

	49	A bionic oriented method for quantitative analysis of geometrical structure of animal organs in mesoscale
		ZHANG Zhi-Hong, LI Ying, WANG Meng, TONG Jin, LAI Qing-Hui, GAO Xu-Hang, STEPHEN Carr
		To quantitatively analyze the structural characteristics of mesoscaled (0.1～1.0 mm) animal organs,the computer vision technology was exploited to substitute the human visual identification process. The foreleg endtooth of typical soil animaldung beetle (Copris ochus Motschulsky) with mesoscaled characteristics were taken as research object to propose a quantitative analysis method. The mesoscale animal organ outer margin contour points were extracted from stereomicroscope image by the proposed method. The stereomicroscope image of bionic object animal organ was prepared, and the Matlab software was used as platform to design program for reducing interference and noise. The outer contour of twodimensional point cloud of dung beetle foreleg end tooth was identified and extracted from the stereomicroscope image to quantitatively analyze geometrical structure. The accuracy and the repeatability of the proposed method were verified. The results show that the outer edge profile of foreleg end tooth can be extracted from stereomicroscopy image with 669×727 pixels, and about 1 500 outer edge contour points are obtained. The selection of different thresholds in the gray scale histogram range does not significantly alter the results of curve fitting. It is confirmed that compared to the traditional method, the digital image processing and computer vision analysis method is efficient and accurate to quantitatively analyze geometrical characteristic features of dung beetle foreleg endtooth.
		2018 Vol. 39 (1): 49-56 [Abstract] ( 789 ) [HTML 1KB] [ PDF 2386KB] ( 1063 )

	57	A multiview stereo visionbased tracking and positioning strategy for surgical instrument
		ZHAO Xin-Yang, LIU Yang-Chuan, GAO Wan-Rong, GAO Xin
		A multiview stereo visionbased tracking and positioning strategy for surgical instrument was proposed. A multiview stereo vision system was built using more than two cameras, and the spatial coordinate of target was reconstructed by the projection line intersection method. Under the condition with no lineofsight blocking, the spatial coordinate of target was reconstructed by extending the projection line equations. With lineofsight blocking in one camera, the binocular stereo reconstruction method was used. The tracking and positioning for a selfmade multipoint surgical instrument with a selfbuilt trinocular stereo vision system were conducted to test the capability of the proposed strategy. The results show that the system can locate the position successfully under different blocking conditions, and both the static error and the dynamic error are less than 0.15 mm. The proposed strategy can solve the problem of lineofsight blocking to some extent and avoid the missing of positioning information, and the system reliability can be improved with the required accuracy.
		2018 Vol. 39 (1): 57-63 [Abstract] ( 698 ) [HTML 1KB] [ PDF 2025KB] ( 2073 )

	64	Optimization of baffle structure in shellandtube heat exchanger based on new heat transfer evaluation index
		ZHENG Ping, WANG Jia-Di, CHEN Xu
		To accurately evaluate the heat transfer effect and ensure the safe and stable operation of heat exchanger, a new heat transfer evaluation index η was proposed, which was equal to the ratio of convection heat transfer coefficient to the onethird power of pressure drop. With special consideration of the effect of pressure drop on heat exchange, the baffle structure was simulated and optimized by CFD software. The optimized baffle spacing was determined, and the optimized baffle cut height was then determined. The results show that with the increasing of baffle spacing and cut height, fluid velocity, pressure drop and convection heat transfer coefficient are decreased, while heat transfer evaluation index is decreased with latter increasing. The heat transfer effect is dependent on convection heat transfer coefficient and pressure drop. For the specific heat exchanger with the length of 1 632 mm, the optimal heat transfer effect was obtained under the conditions with baffle spacing of 350 mm and baffle cut height of 0.375D. The simulation results are in good agreement with the results of the baffle structure of heat exchanger in atmosphericvacuum distillation unit of a refinery.
		2018 Vol. 39 (1): 64-70 [Abstract] ( 699 ) [HTML 1KB] [ PDF 2783KB] ( 1326 )

	71	Design and implementation of thirdparty component security testing system based on mutation technology
		CHEN Jin-Fu, GE Hong-He, CAI Sai-Hua, CHEN Jia-Mei, ZHAN Yong-Zhao
		To solve the automatic detection problem of component security exceptions for the thirdparty component, a prototype tool of thirdparty component security testing system(TCSTS) was designed and implemented. The TCSTS could employ three aspects of security testing for thirdparty component of parameter mutation testing, condition mutation testing and state mutation testing. In parameter mutation testing, the variance value was set as parameter constraint by the test case generation algorithm based on the parameter constraint (TCGPC), and the test cases were generated with different parameter constraint. In condition mutation testing, the test cases were generated to satisfy and violate the precondition, and the existence of security vulnerabilities was checked in the condition judgment statement with postcondition. In state mutation testing, executable method sequences of components were transformed into extended finite state machine (EFSM), and operations conflict sequences generated algorithm (OCGA) and conditions conflict sequences generated algorithm (CCGA) were designed to mutate EFSM and generate conflict sequences. The security testing of conflict sequences after mutation was implemented. The results show that the TCSTS has good operational ability and testing ability. The detection rate of abnormal sequence by TCSTS is more than 20％, which indicates that TCSTS can detect the staterelated security vulnerabilities in the component security testing.
		2018 Vol. 39 (1): 71-77 [Abstract] ( 868 ) [HTML 1KB] [ PDF 1768KB] ( 1157 )

	78	Reversible image watermarking algorithm based on bit plane decomposition
		ZHANG Zheng-Wei, WU Li-Fa, GAO Shang-Bing
		To improve visual quality and embedding rate of existing difference expansion reversible image watermarking algorithm, a reversible image watermarking algorithm was proposed based on bit plane decomposition. The carrier image was decomposed by bit plane, and the low 6 bit planes were combined together to form a new image. The new image was divided into non overlapping blocks. The entropy of each block was calculated, and the image blocks with small entropy were selected to embed into watermark by the generalized difference expansion algorithm. The overflow graph and the relevant auxiliary information were embedded into the selected original image blocks of the corresponding image blocks with large entropy by difference quantization method. The 8 bit gray scale images of Lena and Barbara were used to test the reversible watermarking algorithm. The results show that the algorithm has high embedding rate and high visual quality, and the original image can be fully restored. When Lena is used as host image, the payload reaches 0.93 bpp. Compared with other algorithms, the watermark embedding rate is improved with good visual quality.
		2018 Vol. 39 (1): 78-85 [Abstract] ( 766 ) [HTML 1KB] [ PDF 3340KB] ( 1304 )

	86	3D workpiece pose estimation based on adaptive subpattern manifold learning
		LI Lin, WEI Xin-Hua, SHEN Bao-Guo
		To locate threedimensional workpiece of monocular vision timely and accurately in complex industrial environment, a pose estimation method of threedimensional workpiece was proposed based on adaptive subpattern manifold learning (SPIVP). The constructing manifold method was given by nonlinear reduction of dimension framework and reconstruction of high dimension space, and the low dimensional feature subspace was obtained to maintain the optimal continuity of nature variable. The pose estimation of workpiece was realized based on the manifold construction method. The pose estimation method of workpiece with occlusion was proposed based on SPIVP after the segmentation rules of adaptive subpattern was given. Three kinds of common workpieces were tested, and the horizontal rotation and the vertical rotation were chosen as natural variables to conduct pose estimation of workpieces with or without occlusion. The results show that the average pose estimation time of the proposed method is 73.6 ms, which can meet the requirement of realtime processing. The positioning accuracy rates of screwdriver, crankshaft and cylinder are 95.4％, 96.1％ and 98.4％, respectively. The recognition accuracy of the proposed method is higher than those of other methods in different occlusion cases. The subpattern segmentation method is performed with higher recognition rate than the method without subpattern segmentation.
		2018 Vol. 39 (1): 86-91 [Abstract] ( 647 ) [HTML 1KB] [ PDF 2040KB] ( 1168 )

	92	Magnetic forceassisted electrokinetic remediation of triclosancontaminated soil
		JIE Qing-Jie, MA Xin-Hua
		The magnetic forceassisted electrokinetic (MFAEK) processes were performed to remediate triclosan（TCS） contaminated soil. Kaolin was used to simulate TCS contaminated soil, and the concentrations of simulated pollutants were 10 000, 5 000 and 1 000 mg·kg-1, respectively. A DC power supply was used to provide constant voltage gradient of 2 V· cm-1, and 80 mT magnetic intensity was used to generate magnetic field. The TCS was measured after extraction by methanol and analyzed by HPLC method. The results show that the concentration of TCS in the sections near cathode is more significant than that near the anode sections to indicate the migration of TCS. The highest removal efficiency is 65.1％ after 10 days′ reclamation. The experimental results clearly demonstrate that strong magnetic field and low concentration can improve the removal efficiency.
		2018 Vol. 39 (1): 92-95 [Abstract] ( 763 ) [HTML 1KB] [ PDF 1375KB] ( 1112 )

	96	ICR treatment experiment for fatigue cracks of orthotropic steel bridge deck
		WANG Qiu-Dong, JI Bo-Hai, YUAN Zhou-Zhi-Yuan, YE Zhi, FU Zhong-Qiu
		Three local fullscale specimens with fatigue cracks on weld root of ICR1, ICR2 and DB1 were investigated for the deckU rib weld of orthotropic steel bridge deck. The fatigue loading after impact crackclosure retrofit treatment (ICR treatment) was conducted on ICR1 and ICR2. The half fatigue cracks were processed by ICR treatment, and the specimen was cut along the direction vertical to crack propagation to obtain the initial crack section and the section after treatment. The treatment depth and the superficial tissue were analyzed by the metalloscope. The results show that the propagation life of initial cracks is sharply increased after ICR processing. New fatigue cracks generate in both sides of areas processed by ICR, and the propagation life of new cracks is greater than that of initial cracks. The initial cracks are closed well and bear force with base metal as a whole structure after ICR treatment. The ICR treatment can lead to apparent plastic flow of superficial base metal, where the compression generates towards the weld root and deck thickness.
		2018 Vol. 39 (1): 96-101 [Abstract] ( 590 ) [HTML 1KB] [ PDF 3452KB] ( 1296 )

	102	Surface profile distribution characteristics of corroded steel bars based on fractal theory
		LU Chun-Hua, YANG Jin-Mu, YAN Yong-Dong, FU Qiao-Ying
		To precisely characterize the surface profile of corroded steel bars, a calculating model of fractal dimension and scale coefficient for the crosssectional diameter of corroded steel bars was derived based on structure function method. Four steel specimens with different corrosion rates were obtained from concrete beams eroded by chloride salt. Utilizing micrometer to measure the crosssectional diameter, the distribution characteristics were analyzed. The results show that the diameter of corroded steel bar does not reject normal distribution, lognormal distribution and Weibull distribution. The fractal dimension and the scale coefficient are calculated by derived calculating model, and the fractal dimension of crosssectional diameter is positively correlated with rebar corrosion rate. Combining with fractal dimension and scale coefficient, the unified relationship between absolute measurement and similar measurement of surface profile of corroded steel bars can be realized by the characteristic parameter of corroded steel bars, which helps to characterize the surface profile of corroded steel bars more precisely.
		2018 Vol. 39 (1): 102-107 [Abstract] ( 731 ) [HTML 1KB] [ PDF 1947KB] ( 1381 )

	108	Research progress of foundation pit project impact on neighboring subway structure
		CHEN Su, SUN Bin-Bin, GU Feng-Xiang, LI Yi-Bin, TANG Qiang
		The foundation pit project can cause additive deformation and internal force towards surrounding existing subway structure and bring troubles to metro operation and securities. According to the literature review, current studies mainly focus on foundation pit supporting system, horizontal and vertical size, reinforcement type to foundation, excavation method and relative position between foundation pit and existing subway tunnel. Based on previous achievements, further research direction and contents were provided with coupled effect of deep excavationfoundation pit retainingstructural stiffness, calculation model and parameter selection. The influence factor, the mechanism and the enhancing accuracy of monitor instrument were discussed, and the monitor range and content expanding should be conducted.
		2018 Vol. 39 (1): 108-114 [Abstract] ( 1205 ) [HTML 1KB] [ PDF 1442KB] ( 1531 )

	115	Semicircular bending test of asphalt mixture under freezethaw cycles
		LI Ping, LIU Yang, NIAN Teng-Fei, WU Zhong, MAO Yu
		At the temperature range from -20 to 20 ℃ under freezethaw cycles, the semicircular bending test (SCB test) was designed. Three kinds of asphalt mixture of AC16, AC20 and SMA16 were prepared with respective SBS content of 0,4%,5% and 6%. The effects of SBS content on bottom layer tensile strength and tensile strain were analyzed for 0,6,12 and 18 times of freezethaw cycles. The experimental results show that for the same freezethaw cycles, with the increasing of SBS content, the tensile strength and the tensile strain at the bottom layer are gradually increased with latter decreasing. When the SBS content is 5%, 3 kinds of asphalt mixture all show good bottom layer tensile strength and tensile strain. The bottom layer tensile strength and tensile strain of AC asphalt mixture are better than those of SMA asphalt mixture. In the seasonal freezing area, AC16 asphalt mixture with SBS content of 5% can better alleviate the cracking of road surface.
		2018 Vol. 39 (1): 115-119 [Abstract] ( 723 ) [HTML 1KB] [ PDF 2792KB] ( 1418 )

	120	Durability of C40 machinemade sand concrete for highway culvert in alpine areas
		SHEN Ai-Qin, ZHANG Jing, FAN Li, RUAN Cheng-Hao
		To solve the serious freezethaw and corrosion damage of machinemade sand concrete for engineering construction in alpine areas, the mineral admixture with high performance was used to modify the durability. The incorporation effects of fly ash, flag powder and the mixtures on frost resistance and impermeability of C40 grade machinemade sand concrete were analyzed. The micromechanism was discussed based on the interfacial zone morphology and pore structure. The results show that the mixing of fly ash and flag powder can significantly improve the durability of C40 grade machinemade sand concrete better than the single one. Mixing with 21% fly ash and 9% flag powder, the frost resistance and the impermeability of C40 grade machinemade sand concrete are greatly improved in both early and late stages, and the interfacial zone morphology and pore structure are significantly improved.
		2018 Vol. 39 (1): 120-124 [Abstract] ( 883 ) [HTML 1KB] [ PDF 1568KB] ( 1287 )

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