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Journal of Jiangsu University(Natural Science Eidtion)

	2018 Vol.39 Issue.4 Published 2018-07-10

	Article

Article

	373	Effect of partitions on premixed CH4／air combustion characteristics in micro channels
		PAN Jian-Feng, CHA Zheng-Qian, LU Qing-Bo, SHAO Xia, LU Zhi-Gang
		In micro combustion chamber, the partitions can lead to the changes of flow field distribution and heat transfer. To analyze the effect of partitions on the premixed combustion process, the flammability limits of premixed CH4/air and the temperature distribution on the outer wall surface of micro combustor with or without partitions were investigated. The experimental results show that the input amount of air is increased by adding partitions when the flame enters the combustor at the same flow rate due to heat loss. The flame spreads more easily in the combustor when the partitions are spaced in the outlet， and the mixture cannot be burned in the 2mmwidth channels divided by partitions under any equivalence ratio. The flame stability is good in the combustor with 4mmdistance partitions. Compared with stainless steel, using Pt as partition material can broaden the flammability limits and improve the uniformity of temperature distribution.
		2018 Vol. 39 (4): 373-376 [Abstract] ( 542 ) [HTML 1KB] [ PDF 2372KB] ( 1013 )

	377	Large eddy simulation of small hole jet flow inside swirl channel of gas turbine
		WANG Ping, YU Qian, WANG Bao-Tong, XU Liang
		To solve the problem of smallhole fuel jet flow in PRECCINSTA gas turbine, the large eddy simulation (LES) method was used to simulate the mixing process of methane and air in cold isothermal state by the flow field calculation program of LESOCC2C. Four simulations were performed with global equivalent ratio of 0.70,0.83 and with grid combination of 1.2 million or 1.8 million cells, respectively. The results show that because of the short mixing time, there is large equivalent ratio fluctuation when the mixture enters combustion chamber, resulting in strong partially premixed combustion phenomenon in combustion chamber. For the global equivalent ratio of 0.83, the calculated equivalent ratio fluctuation range is close to ［0.59, 1.15］. For the global equivalent ratio of 0.70, the equivalent ratio fluctuation range is ［0.40, 1.00］, which is beyond the applicable range of partial reaction mechanism. Therefore, suitable combustion model and simplified reaction mechanism are required to conduct the LES of PRECCINSTA combustion problems with small hole fuel jet flow phenomenon.
		2018 Vol. 39 (4): 377-384 [Abstract] ( 380 ) [HTML 1KB] [ PDF 4912KB] ( 1078 )

	385	Control method of intelligent vehicles cluster motion based on SMC
		JIANG Hao-Bin, Cao-Fu-Gui, Zhu-Wei-Wei
		To solve the mechanism and control problems of cooperative driving between intelligent vehicles, the method was proposed based on the theory of fish swarm cluster motion. The cluster rules of fish swarm was analyzed, and the diamond formation of intelligent vehicles was established. According to the minimum safe distance theory, the geometric position of diamond was determined, and the pilot following method was used to generate the parameters of virtual vehicles. The SMC theory was applied to design the tracking controller, and the accelerations of following vehicles were calculated to achieve the safe and orderly running of multiple vehicles on freeway. PreScan and Matlab/Simulink were used to establish the joint simulation. The results show that the intelligent vehicle at random position can be gathered to the pilot vehicle from the initial state and follow the same trend of the pilot vehicle movement to achieve the process from disorderly to orderly travel.
		2018 Vol. 39 (4): 385-390 [Abstract] ( 755 ) [HTML 1KB] [ PDF 1629KB] ( 1559 )

	391	Design of dynamic system for new type twoaxis drive hybrid electric vehicle
		ZHENG Chen-Fei, TIAN Shao-Peng
		According to the distributed structure of common hybrid vehicle powertrains, a domestically traditional fuel vehicle was used as research platform, and a new twoaxis drive hybrid vehicle powertrain was designed without changing the overall structure of original vehicle. The powertrain of original car was retained, and a complete electric drive system was installed on the rear axle. Based on the passenger car emission and energy consumption test standards and the actual operating conditions, the parameters of relevant power components of the rear axle electric drive system were matched, and the vehicle control strategy was designed. The vehicle simulation model was established by AVLCruise, and the vehicle performance was also simulated and analyzed. The results show that the new twoaxis drive hybrid system can flexibly switch the vehicle drive mode to meet the requirements of different driving conditions. The new twoaxis drive hybrid system has greater improvement in power performance than the original vehicle, and the fuel economy is 10.58% higher than that of original vehicle with significantly improved vehicle performance.
		2018 Vol. 39 (4): 391-396 [Abstract] ( 428 ) [HTML 1KB] [ PDF 1786KB] ( 1098 )

	397	Analysis and optimization of lowspeed roar in a certain SUV
		YUAN Shou-Li, YIN Fan, LIU Zhi-恩
		To solve the problems of lowspeed jitter and roar during acceleration, the vibration and noise test and the simulation analysis were conducted. Several optimization schemes of changing singlemass flywheel to dual mass flywheel, reducing torsional stiffness of clutch, increasing diameter of drive shaft and installing torsional vibration damper at the end of drive shaft were proposed. Through road test, the rubber aging of torsional vibration damper was found, and it was difficult to control the damping. The results show that low speed jitter and rumbling problems occur near the engine speed of 1 200 r·min-1 and are mainly caused by the lowspeed torsional vibration of transmission system. The proposed optimization schemes can effectively improve the torsional vibration of transmission system, and the side noise of driver and passenger can be reduced about 23 dB(A). The eventual optimization solution is to reduce torsional stiffness of clutch and increase diameter of drive shaft.
		2018 Vol. 39 (4): 397-402 [Abstract] ( 479 ) [HTML 1KB] [ PDF 2994KB] ( 1050 )

	403	odeling and simulation of lithium battery based on second order Thevenin model
		YAN Hui-Xiang, GAN Xiao-Yan, WU Hong-Hui, LIU An-Hui
		Several typical battery models were introduced, and the second order Thevenin model was selected as research object. The performance test of lithium battery was carried out, and the hybrid pulse power characteristic (HPPC) test was used to identify the parameters of battery model. With Matlab/cftool, the experimental data were polynomial fitted. In Matlab/Simulink, the simulation model was built and simulated. Through the comparison of simulation and test results, the validity of lithium battery model parameter identification was verified. The reason for the increase of simulation error was analyzed, and the method to improve the accuracy of battery model parameters was proposed. The results show that the model can accurately describe the external characteristics of lithium battery under different working conditions, and the simulation error is increased with the decreasing of state of charge (SOC). When the SOC<0.2, the simulation error is increased obviously.
		2018 Vol. 39 (4): 403-408 [Abstract] ( 998 ) [HTML 1KB] [ PDF 2165KB] ( 2364 )

	409	Automatic soybean disease diagnosis model based on image correction technology
		GUAN Hai-鸥, LIU Meng, MA Xiao-Dan
		To solve the problem of nondestructive collection of nonlinear distortion images of soybean diseases and the mapping relationship between disease types, the digital image processing technology and the neural network reasoning mechanism were combined to propose the automatic diagnosis model of soybean disease by image correction technology.The nondestructive collection of digital images of soybean diseases was conducted by selfmade calibration templates, and the bilinear projection mapping algorithm was used to correct the geometric distortion of disease images.The shape of lesion area characteristics,the color feature and the texture feature parameter were calculated based on the multidimensional feature index. The inference rules of soybean disease were automatically obtained by applying the strong adaptability of neural network, and the automatic diagnosis model of soybean disease was established.The simulation experiments show that the distortion correction accuracy of soybean diseases is more than 99%, and the diagnostic accuracy of disease types is 98.33%. The automatic diagnosis and the accurate measurement of soybean diseases are realized.
		2018 Vol. 39 (4): 409-413 [Abstract] ( 470 ) [HTML 1KB] [ PDF 1396KB] ( 979 )

	414	Automatic recognition of agricultural products based on fusion semantics of regular expression
		LU Bing, SUN Jun, XU Xiao-Dong
		To solve the problem of low rate of automatic sorting and identification for different agriculture products on the same transmission line, according to the physical identification characteristics of object contour, color , relative distance and different vibration characteristics by different products under special application scenario, the characteristic element library of colors,lines,locations and vibration was established. According to heuristic knowledge, the match feature of agriculture products was constructed by regular expression,and the matching model of agriculture products was constructed quickly.The generation time of model was shortened in image recognition process,and the efficiency of image recognition was greatly improved.The automatic sorting and recognition rate of products for different categories with similar contour was greatly improved due to the fusion of vibration characteristics.The experiment results show that the proposed method can achieve significant improvement in target recognition rate of agriculture products,and the recognition rate is 92.5% under constant perspective with average recognition time of 50.3 ms.Compared with conventional algorithms of scale invariant feature transform(SIFT) and speeded up robust feature(SURF),the proposed method achieves significant improvement of automatic sorting and identification under constant perspective.
		2018 Vol. 39 (4): 414-419 [Abstract] ( 652 ) [HTML 1KB] [ PDF 1577KB] ( 1017 )

	420	Influence factors on sensitivity in design of narrow bandpass filter band
		HOU Hai-Gang, LIU Gui-Wu, SHAO Hai-Cheng, WANG Ming-Song, QIAO Guan-Jun
		For designing narrow bandpass filter, better narrowband filter can be obtained by changing some parameters, but some theoretical designs are different with preparation results. To reveal the relationship between design and preparation, the simulation experiments were carried out with Essential Macleod software. The effects of high and low refractive index interval layer, number of reflectors, interference order and number of cavities on the sensitivity of narrow bandpass filter design and preparation were analyzed. The results show that the steepness can be improved with increased half bandwidth and rectangularity when the number of mirror layers is increased. The sensitivities of thin film narrow bandpass filters with both high and low refractive index cavity layer are increased, and the fabrication difficulty is increased. With the increasing of interference orders,the steepness is improved with decreased half bandwidth and increased rectangularity, and the sensitivity of thin film narrow bandpass filters cannot be affected. Using low refractive index material as cavity layer, the sensitive layers (cavity layer) can increase the thickness error and the fabrication difficulty with the increasing of interference orders. With the increasing of the number of cavities, the steepness can be improved with increased half bandwidth and rectangularity. The sensitivity of thin film narrow bandpass filters cannot be affected with high refractive index materials as cavity layer, while it is increased with low refractive index materials as cavity layer.
		2018 Vol. 39 (4): 420-424 [Abstract] ( 666 ) [HTML 1KB] [ PDF 2077KB] ( 1103 )

	425	Automatic detection of watermask for resin glasses by machine vision
		SUN Li, LIU Chen, YAO Hong-Bing
		To realize the automatic detection of watermask for resin glasses, the point light projection illumination model was built to explore the influence factors of relative distance between light source and resin glasses, imaging screen reflectivity, glasses physical properties and imaging distance on the imaging. Based on the simulation result, the automatic detection system for watermask was designed to capture and analyze the projection image. The algorithms of region growing, morphological operation and ellipsefitting were employed to segment the glasses projection region from the background. Sobel edge detection and thresholding were combined to extract the region with sudden change of grayscale in local pixel space. The connected region area was calculated and served as constraint condition for further selection of the defect region. The experimental results show that the digital image process can be applied to different type of resin glasses. The recognition of glasses watermask can reach 100%, and the process of imaging, recognition and location consumes 872 ms.
		2018 Vol. 39 (4): 425-430 [Abstract] ( 715 ) [HTML 1KB] [ PDF 2450KB] ( 1354 )

	431	Comparison of spatial circle fitting methods based on measuring data collected from binocular stereo vision system
		LIU Yang-Chuan, TANG Yu-Guo, GAO Xin
		To find the optimal spatial circle fitting method in the measuring engineering application, the comparison of spatial circle fitting methods was completed based on the data collected from a binocular stereo vision system. According to the solving order and relevance of plane and spherical surface intersecting into a spatial circle, the existing five fitting methods were divided into three categories of solving plane and sphere together, solving plane and sphere independently and solving plane and sphere correlatively. The spatial circle fitting experiment was carried out to compare and analyze the performance and influence factors of fitting methods. Using the selfdeveloped binocular stereo vision system, three sets of spatial coordinates of a target making circular motion with multitooth dividing table were collected as fitting data, and the centerplane distance, the flatness and the roundness were used as fitting accuracy evaluation indexes. The experimental results show that the spherical surface needs the plane constraint to be solved correctly. The optimal fitting method is that the normal vector and constant coefficient of the plane are firstly solved by the leastsquare adjustment method, and then the center and radius of the sphere are solved by the coordinate system transformation or the perpendicular bisection plane method. The fitting accuracy can be improved by increasing the number of measurement points.
		2018 Vol. 39 (4): 431-437 [Abstract] ( 628 ) [HTML 1KB] [ PDF 1567KB] ( 1470 )

	438	A novel vector control of sixphase induction motor based on backstepping control algorithm
		BAO Guang-Qing, ZHANG Ji-Long, ZHANG Xiao-Long, LI Xiao-Dong
		To solve the slow response and poor robustness in traditional vector control(VC), considering the characteristics of space vector decoupling of sixphase motor, a novel VC of sixphase induction motor was proposed based on backstepping control algorithm. The mathematical model of motors was established, and the new virtual voltage balance vector was used to determine the space voltage vector pulse width modulation. The backstepping principle was adopted to design the backstepping controller for replacing the traditional PI controller, and the tracking of the induction motor for the given signals was realized to guarantee the global stability of system. The system was verified by the simulation in MATLAB/Simulink, and the simulation result was compared with that of PID control method. The results show that the strategy has the advantages of rapid response, high control precision and strong antiinterference ability with improved stator current waveform, and the efficiency of system design is proved.
		2018 Vol. 39 (4): 438-444 [Abstract] ( 536 ) [HTML 1KB] [ PDF 2212KB] ( 1032 )

	445	Performance parameter analysis of a low speed AFPMSG with stator coreless
		ZHU Jun, LI Shao-Long, SONG Dan-Dan, HAN Qiao-Li, LI Guang-Hua
		To solve the problems of low power quality and high cost of permanent magnet generator, the performance parameters of air gap magnetic density, voltage regulation rate and electromagnetic torque ripple of a double external rotor stator coreless axialflux generator were investigated. The electromagnetic structure and the advantages of the generator were described. A kind of magnetic pole structure and the key parameters of "cake cut" type were optimized by threedimensional finite element. Based on the comprehensive consideration of improving the utilization ratio of permanent magnetic materials, the effects of the parameters of pole arc coefficient, permanent magnetic thickness and air gap length on the performance parameters of generator were analyzed. The optimization of magnetic pole structure and parameter shows that the power density of "cut cake" type magnetic pole structure is the largest. The permanent magnet material is reduced by 11.5% than that of trapezoidal structure, and the distortion rate of voltage waveform is reduced by 26.2%. The performance of the motor is improved, and the correctness and effectiveness of the proposed parameter design is verified by the performance test of the prototype.
		2018 Vol. 39 (4): 445-452 [Abstract] ( 520 ) [HTML 1KB] [ PDF 3411KB] ( 1102 )

	453	Design and experimental test of dynamic vibration absorber for space vehicle
		ZHAO Ya-Ping, XU Zhen-Bang, XIA Ming-Yi, HE Shuai, QIN Chao
		To suppress the vibration of spacecraft, a design scheme of dynamic vibration absorber (DVA) with compact spatial layout and noncontact damping force was proposed. The evaluation model of vibration damping effect for DVA was established. The finite element analysis and the hammer percussion experiment were carried out to verify the accuracy of frequency design for DVA. The electromagnetic actuator and the dynamic vibration absorber were placed at different position of cantilever beam to test the damping effect of DVA. The experimental results show that the frequency of DVA is 29.38 Hz, and the error is not more than 2.06% compared with target base frequency of 30.00 Hz. For the fundamental frequency vibration of cantilever beam, compared to the DVA without eddy current damper, the damping effect of DVA with eddy current damping is decreased, while the damping bandwidth is extended from 28.8030.97 Hz to 29.0935.53 Hz with bandwidth expanding of 67.5%. For the second order frequency vibration of cantilever beam, the DVA without eddy current damper has no effect, while the DVA with eddy current damping has suppression effect with the maximum suppression of 37.3% to the second order resonance peak.
		2018 Vol. 39 (4): 453-458 [Abstract] ( 578 ) [HTML 1KB] [ PDF 5866KB] ( 1128 )

	459	Synthesis and characterization of N and S codoped carbon dots
		LU Qing, WANG Li, LIANG Guo-Xi
		A simple and novel synthesis method of carbon dots (CDots) was proposed via direct acid hydrolysis of malic acid, ethylenediamine and Lcysteine in onestep hydrothermal treatment. The morphology, structure, composition and optical properties of carbon quantum dots were tested. The optimized conditions for preparation of CDots were determined with reaction temperature of 150 ℃, pH value of 8.0 and reaction time of 24 h. The results show that the novel N,S codoped CDots have uniform particle size distribution and good water solubility. According to Xray diffraction patterns, the prepared N,SCDots mainly consist of C, N, O and S elements, and N and S elements exist in the form of amino group and sulfonic acid group, respectively. The fluorescence quantum yield of the prepared N,SCDots reaches 23.84% with good fluorescence properties for bioapplication.
		2018 Vol. 39 (4): 459-464 [Abstract] ( 686 ) [HTML 1KB] [ PDF 2760KB] ( 1356 )

	465	Evaluation and analysis of atomization effect of three kinds of aerial nozzles based on highspeed wind tunnel
		LU Feng, RU Yu, CHEN Jing-Yuan, ZHOU Hong-Ping, CHA Yu-Ping, LI Zong-Fei
		The highspeed wind tunnel test system was used to simulate the highspeed air flow generated during flight, and the effects of air flow size and nozzle structure parameters on the particle size and distribution of droplets were investigated.The results show that the three types of aviation nozzles are produced for a certain nozzle model, and the particle size of droplets is decreased with the increasing of wind speed. For the same spray pressure and wind speed, the droplet size of three kinds of nozzles is increased with the increasing of aperture. The relative width S values of aerosol droplets of the aerial nozzles are relative small, indicating that the droplet distribution is uniform.The structures of CP03 nozzle are diverse, and the nozzle is allowed for flexible flow adjustment under different pesticide spraying operations.The droplet of GP81A nozzle is larger than those of other nozzles. Large particle size should be combined with aircraft operating parameters to further optimize nozzle structure to achieve lowvolume spray and reduce pesticide waste.The single helicopter swivel nozzle structure should be optimized based on helicopter spray characteristics.
		2018 Vol. 39 (4): 465-470 [Abstract] ( 479 ) [HTML 1KB] [ PDF 2248KB] ( 1060 )

	471	Analysis on protective effect of deep hole grouting from surface on foundation pit and adjacent building
		WANG Ya-Jun, WU Ke, YU Ya-Lin
		To control the effect of foundation pit construction on adjacent building， the effects of deep hole grouting from surface on foundation pit and adjacent building were investigated. Based on the foundation pit in Shenzhen Metro Line 10, the effects of three conditions of deep hole grouting from surface on settlement deformation of building, lateral deformation and support internal force of foundation pit were analyzed by ABAQUS software. The results show that the lateral deformation of foundation pit and the settlement deformation of adjacent foundation building are decreased by deep hole grouting from surface, while it has slight effect on the bottom deformation of foundation pit. The stress concentration is observed on grouting hole at the corner, which is especially obvious in the 3rd condition. The effect of grouting hole in the 2nd condition and 3rd condition is close, while the stress in grouting hole of 2nd condition is more uniform and reasonable.
		2018 Vol. 39 (4): 471-477 [Abstract] ( 414 ) [HTML 1KB] [ PDF 3722KB] ( 996 )

	478	Dynamic response mechanism of exposed steel column base in low and multistory steel frame structure
		BAO 恩He, WANG Tian-Cheng, SUN Ling-Yun
		To investigate the dynamic response mechanism of exposed steel column base in low and multistory steel frame structure, the model of slip hysteresis loop for exposed steel column base was defined with the consideration of the influence of varying axial force. The 13 low and multistory regular steel frame models were established based on the main research parameters of frame shape and strength factor of exposed steel column base. The dynamic response was analyzed by elasticplastic timehistory analysis. The results show that the first layer displacement angle is increased, while the second layer displacement angle is decreased with the decreasing of strength factor of exposed steel column base.When the strength factor of exposed steel column base is less than or equal to 0.6, the first floor deformation is centralized for 3layer model, while the distribution of the maximum layer displacement for 6layer model is nearly uniform. The plasticdeformation energy for 3layer model is centralized on the beam end of the first layer, and the distribution of plasticdeformation energy for 6layer model is nearly uniform. The hysteresis curve shape of dynamic response and the yield moment are consistent with those of the proposed slip hysteresis loop model for exposed steel column base.
		2018 Vol. 39 (4): 478-484 [Abstract] ( 500 ) [HTML 1KB] [ PDF 3511KB] ( 1047 )

	485	Flow deformation analysis of postliquefaction sand based on VOF method
		ZHOU 恩Quan, ZHU Xiao-Dong, LU Jian-Fei, ZUO Xi, WANG Bing-Hui
		Considering the liquefied sand soil as Newtonian fluid and shearthinning nonNewtonian fluid respectively, the volume of fluid (VOF) method in computational fluid dynamics was adopted to investigate the free flow deformation morphology of postliquefied sand. The effects of viscosity, consistency coefficient and flow index on the flow deformation characteristics were analyzed. Compared with the physical model test, the results show that the proposal method can well reproduce the flow deformation shape of the model test, but the fluid properties have great influence on the velocity of flow deformation. When the liquefied sand is considered as Newtonian fluid, the increasing of consistency coefficient, the resist deformation ability is increased with decreased flow deformation velocity. When the liquefied sand is regarded as shearthinning fluid, with the increasing of consistency coefficient, the flow index is decreased, and the integral flow deformation velocity of liquefied sand is also decreased.
		2018 Vol. 39 (4): 485-491 [Abstract] ( 581 ) [HTML 1KB] [ PDF 2671KB] ( 1077 )

	492	Foaming performance of foamed asphalt based on orthogonal test
		GUO Yin-Chuan, ZHAO Bin, LI Peng, SHEN Ai-Qin, BU Jin-Xin
		The foamed asphalt was produced by selfdeveloped foaming machine. The effects of asphalt types, heating temperature, foaming water content and pressure (air pressure and water pressure) on the performance of asphalt foaming were investigated through orthogonal test, and the foaming factors and the foaming process were analyzed. The results show that proper asphalt temperature can improve the asphalt fluidity to enlarge the expansion rate of foamed asphalt. It is not appropriate to increase water consumption only for enlarging expansion rate, and excessive water consumption can inhibit the growth of asphalt foam, especially for modified asphalt. The effect of pressure on foaming properties of matrix asphalt is opposite to that of modified asphalt. The foaming performance of matrix asphalt and modified asphalt should be treated separately, and on the basis of modified asphalt, the expansion rate and the halftime of matrix asphalt from Panjin Liaoning should be increased by 25% and 30%, respectively.
		2018 Vol. 39 (4): 492-496 [Abstract] ( 459 ) [HTML 1KB] [ PDF 1736KB] ( 1324 )

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