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Journal of Jiangsu University(Natural Science Eidtion)

	2016 Vol.37 Issue.5 Published 2016-09-10

	Article

Article

	497	Analysis of influencing factors on testing results of vehicle roller antiforce brake testing platform
		HUANG Wan-You, YU Ming-Jin, FU Wen-Jun, FAN Yan-Yan, WANG Qi, SUN Peng
		The vehicle braking performance platform test has become the main technical approach to check the technical situation of vehicle braking system and ensure the safety of vehicle operation. The mechanical structure of a new vehicle roller antiforce brake testing platform was described, and the kinetic analysis of the test platform was conducted. The effects of axle load, roller height difference, setting angle, roller surface adhesion coefficient, tire pressure, sampling frequency of braking signal and driver driving operation on the test precision of brake testing platform were tested and analyzed. The results of field vehicle test show that roller distance adjustment and tire pressure change have significant impact on the braking dynamic test results. When the roller distance is increased from (470+26)mm to (470+150)mm, the equivalent adhesion coefficient increases from 0.636 to 0.746. When the tire pressure is increased from 0.15 MPa to 0.35 MPa, the maximal braking force is decreased by 25.8%. To obtain accurate test result of braking force, the test requirements of roller distance and tire pressure should be satisfied in real application.
		2016 Vol. 37 (5): 497-502 [Abstract] ( 1493 ) [HTML 1KB] [ PDF 2493KB] ( 2691 )

	503	Modeling and simulation on white noise of road roughness in time domain
		LI Zhong-Xing, HUANG Jian-Yu, LIU Ya-Wei, JIANG Hong
		According to the requirements of GB/T 7031—2005 to the root mean square of random road surface under different road roughness coefficient, the fitting expression of white noise input was defined. After recalculating the speedrelated e parameter, the perfect road surface roughness domain model was established based on the fitting speed gain function for the fluctuation of e value. The spectral density curves generated by Matlab/Simulink were compared with those of standard road grade to verify the proposed model. The simulation results show that the e value is related to the speed and has no significant relationship with road roughness coefficient. At low speed, the e value fluctuates slightly, while it tends to 0.218 at high speed. After perfecting the model, the error between root mean of random road elevation and road grading standard is from 0.157% to 1.730%, which shows that compared to the traditional time model of white noise, the proposed model has higher accuracy.
		2016 Vol. 37 (5): 503-506 [Abstract] ( 1771 ) [HTML 1KB] [ PDF 1702KB] ( 4261 )

	507	Characteristic analysis of a new compound HMCVT
		YU Jin, WU Chao-Yu, HU Yu-Hang, MOU Jia-Wang
		To solve the limited speed range and low load capacity of singlerow planet hydraulic mechanical transmission, a new compound hydraulic machinery continuously variable transmission(HMCVT) was proposed. The unified relationship of HMCVT characteristics was established. The hydraulicmechanical transmission was simulated by AMESim software. The HMCVT prototype was tested to obtain the performance curve and compared with that of the coupled output transmission. The results show that the actual HMCVT speed characteristic value is consistent with theoretical value. The compound hydraulic mechanical transmission has continuously variable speed function. The compound HMCVT has good speed linearity with easy adjustment ability. The hydraulic powersplit ratio of HMCVT is from 0 and 1.0 without power cycling and with high mechanical efficiency.
		2016 Vol. 37 (5): 507-511 [Abstract] ( 1381 ) [HTML 1KB] [ PDF 2007KB] ( 1935 )

	512	Emission and particulate topography characteristics of diesel engine fuelled with methanolblending biodiesel
		YUAN Yin-Nan, LI Jun, DU Jia-Yi, ZHANG Deng-Pan, ZHAO Xiao-Ming
		On the 186FA diesel engine, the experiments of blending biodiesel and methanolblending biodiesel were carried out, and the exhaust particulates were collected. The effects of methanolblending biodiesel on engine performance and topographic characteristics of particulates were also analyzed. The results show that with the increasing of methanol proportion, the engine comsumption with microemulsion fuels is increased especially at low load with small difference for medium and high load, and the HC emission of diesel engine increases gradually. As the increasing load becomes big, the HC decreases slowly. Compared with blending biodiesel, the fuels mixed with methanol can effectively decrease NOx and PM emission, and at high load, CO emission is reduced evidently. The particulates for different fuels represent catenulate, dendritic and cluster structures. When the methanol proportion is increased, the particulates become more compacted, and the size distribution of particulates is decreased with increased aggregation degree.
		2016 Vol. 37 (5): 512-517 [Abstract] ( 1265 ) [HTML 1KB] [ PDF 1909KB] ( 1961 )

	518	Lateral vibration characteristics of friction hoist
		LIU Yi, YANG Fang, XIA Chang-Gao, LI Ji-Shun
		As an important aspect for dynamic design, the lateral vibration characteristics of friction hoist directly affect the friction hoist security work. To further study the relationship between frictional lateral vibration and related factors, the theory of elasticity mechanics was used to build the distributing theoretic model of coupled ropecage vibration for friction hoisting system. Finite element method was used to verify the feasibility and effectiveness of the proposed model. The causes and effects of abnormal vibration and dynamic instability during the upgrade hoisting were analyzed. The results show that linear density of wire rope, operating load, hoisting speed have significant impact on lateral vibration, while the contact stiffness of container and can road has slight effect.
		2016 Vol. 37 (5): 518-524 [Abstract] ( 1381 ) [HTML 1KB] [ PDF 2117KB] ( 1764 )

	525	Subsequent development of droplet collision in impinging stream
		WU Ge-Ping, GONG Jun, DU Min, CHEN Wei
		To investigate the subsequent development of drop impact in impinging stream, the theoretical model was established to correctly reflect the droplet collision and subsequent development. The proposed model was used to simulate the coalescence or the secondary atomization by droplet collision in coaxially opposed two gasliquid impinging stream. The particle size distribution of droplets between two nozzles was theoretically investigated, and the effects of size, velocity, viscosity and impact angle on droplet size distribution were analyzed. The simulation results show that the smaller the droplet size is, the greater the probability of collision coalescence is. The greater the viscosity is, the greater the probability of collision coalescence is. Droplets occur coalescence when the velocities are small. With the increasing of velocity, the probability of secondary atomization is increased. Under the same conditions, when droplets occur oblique impact, the probability of secondary atomization is larger than that for direct impact.
		2016 Vol. 37 (5): 525-529 [Abstract] ( 1303 ) [HTML 1KB] [ PDF 2970KB] ( 2169 )

	530	Effects of light and temperature on growth and development of lettuce in stereoscopic cultivation
		ZHOU Jing, LI Ping-Ping, WANG Ji-Zhang, LU Jia-Jun
		Using romaine lettuce (lactuca sativa L.) as material， the effects of light and temperature in greenhouse on yield, morphology, chlorophyll content and chlorophyll fluorescence parameters were investigated under the condition of stereoscopic cultivation. The results show that the light radiation intensities in middle layer and in lower layer are 36.4% to 45.6% and 24.8% to 37.3% of that in upper layer，respectively. The light radiation intensity is relatively high in sunny day at 10：00 to 16：00. The temperature is significantly different in the three layers, and the temperatures in the middle and in the lower layers are 84.8% and 73.2% of that in the upper layer，respectively. Fresh weigh, leave number, stem height and leaf area of lettuce of upper layer are all higher than those of middle and lower layers. The analysis on chlorophyll fluorescence parameters shows that with the decreasing of light intensity and temperature in the middle and lower layers, Y(Ⅱ) and ETR are decreased, while Y（NO）and Y（NPQ）are increased. Lettuce yield and photosynthetic capacity are significantly influenced by light and temperature.
		2016 Vol. 37 (5): 530-535 [Abstract] ( 1323 ) [HTML 1KB] [ PDF 1671KB] ( 2901 )

	536	Determination of mineral elements in tea by peak method modeling of Xray fluorescence spectrometry
		LI Guo-Quan, XING Wei-Fei, QI Xue-Yong, CHEN Bin
		A method of Xray fluorscence spectrometry（XRFS） was proposed to determine 11 elements of Al, P, S, K, Ca, Mn, Fe, Ni, Cu, Zn and Pb in the tea.The peak area method was widely used in the determination model of traditional energy dispersion Xray fluorescence,which easily resulted in a major error due to the peak location overlaps of different elements. The peak method modeling was adopted to analyze the data from Xray fluorescence and achieve good prediction efficiency. The 11 elements were detected by PLS+ANN to establish calibration model.The results show that 10 elements have good correlation coefficients except Ni element with 0.6. The correlation coefficients of Ca and Zn are above 0.7, and those of P, S, K, Cu and Pb are exceed 0.8 with those of Al, Mn and Fe greater than 0.9.It is reasonable to apply the peak method into Xray fluorescence for determining element content.
		2016 Vol. 37 (5): 536-540 [Abstract] ( 1042 ) [HTML 1KB] [ PDF 1548KB] ( 1841 )

	541	Design and analysis of active disturbance rejection control system for under actuation walking robot
		FEI Lan-Bing, LOU Fei, MIAO Guo-Bin
		Passive dynamic walker has local stability with walking cycle converging to a fixed point on the slope， and in other circumstances, the stabilization of walking cycle is broken to result in unstable walking .An under actuated walking robot was designed and developed to solve the problem. To improve the walking ability, an active disturbance rejection control system was proposed for the under actuated walking robot based on human parameters. Combining the under actuated walking theory and based on multichannel ADRC method， the fixed point was used as system input state variables to achieve decoupling control and walking. The proposed control system was modeled and analyzed by Simulink. The results show that the robot can simply and effectively achieve under actuated walking by the control system. Under external disturbance, every original state of walking cycle can also be limited in acceptable range. The robustness performance of robot system is improved drastically.
		2016 Vol. 37 (5): 541-547 [Abstract] ( 1359 ) [HTML 1KB] [ PDF 2145KB] ( 1992 )

	548	Optimization and test of spraying parameters for P20 multirotor electric unmanned aerial vehicle based on response surface method
		QIN Wei-Cai, XUE Xin-Yu, ZHANG Song-Chao, GU Wei, CHEN Chen
		In order to find out the factors and the influence degree on multirotor electric unmanned aerial vehicle spraying deposition to increase the level of droplets deposition on target, based on the singlefactor test, the spraying parameters were experimentally investigated by the central combination test and design concept of BoxBehnken to establish the corresponding test methods and specifications. Using working parameters of flight height, flight velocity and nozzles flow rate as influence factors and mean droplet deposition levels as target function, the quadratic polynomial model of droplet deposition levels was established, and the effectiveness of mode and the interaction of factors were analyzed. The model was analyzed and optimized by regression analysis method and response surface analysis method of DesignExpert 8.0.5 software. The optimal combination of spraying parameters was obtained and verified, and the experimental verification of the mathematical model was also conducted. The results show that the decreasing effect sequence on droplet deposition levels on target is flight height, flight velocity and nozzles flow rate. The optimal combination of spraying parameters is with flight height of 2.0 m, flight velocity of 3.7 m·s-1 and nozzle flow rate of 430 mL·min-1. The largest droplet deposition level on target is 68.69% under the optimal conditions, and the relative error to estimated value on the model is lower than ±5%.
		2016 Vol. 37 (5): 548-555 [Abstract] ( 1289 ) [HTML 1KB] [ PDF 3403KB] ( 2158 )

	556	Detecting fMRI activation by meanshift clustering method based on voxel neighborhood information
		ZHANG Rui, XIONG Jin-Hu, WANG Dong-Xing, GAO Xin
		To improve the antinoise capacity and precision of fMRI activation area detecting method, a meanshift clustering method was proposed based on voxel neighborhood (VNMSC). A twodimensional feature space was constructed for VNMSC based on temporal properties of a voxel and its neighbors. The correlation coefficient between MRI timeseries and stimulation response function of each voxel was calculated by crosscorrelation analysis. The correlation coefficient between timeseries of a voxel and the neighboring voxels was also calculated by the same method. Based on the feature space, a meanshift clustering was adopted to detect active region of fMRI to obtain simulated and real fMRI data. The VNMSC method was tested by simulation data and practical fMRI data. The results show that the sensitivity and specificity of MSCVN technique are better than those of the traditional crosscorrelation analysis (CCA) and CCA plus cluster analysis in any activation area size when the kernel size is appropriate. The results of real fMRI data demonstrate that MSCVN and other two methods have good consistency in accuracy, while the detection region of the proposed method is more complete.
		2016 Vol. 37 (5): 556-561 [Abstract] ( 907 ) [HTML 1KB] [ PDF 2140KB] ( 2071 )

	562	Advancement of anonymity technique for data publishing
		LIU Xiang-Wen, WANG Liang-Min
		With the rapid development of computer and network technology, data publishing achieves wellsharing of information for the purpose of data mining and analyzing, whille it may cause the leakage risk of a great amount of sensitive privacy information in the data. Anonymity technology is the main method to realize privacy preservation in data publishing. The research progress of anonymity technology in data publishing was summed up. The scenario of data anonymization was introduced briefly. The anonymization models were summarized, which were respectively used to deal with static data publishing of single sensitive attribute and multidimensional ones, incremental data publishing, streaming data publishing and trajectory data publishing. The anonymization model abilities to resist linking attack, homogeneity attack and background knowledge attack were analyzed. The anonymization methods of generalization, suppression, clustering, microaggregation, anatomy and permutation were analyzed and compared. The applications of anonymity techniques for privacy preservation in the fields of data mashup, location based services and social network were discussed. The future research of anonymity technology for data publishing was proposed.
		2016 Vol. 37 (5): 562-571 [Abstract] ( 1513 ) [HTML 1KB] [ PDF 1421KB] ( 4372 )

	572	Advancement of compression transmission techniques for WSN provenance
		ZHENG Wen-Yi, MAO Jian
		As a key factor for assessing data trustworthiness, provenance records the whole transmission procedure of data package from generation to base station in wireless sensor network (WSN). The provenance expands rapidly with the increasing of package transmission path length, and it is common to take provenance compression algorithm to save network energy consumption and communication bandwidth. The data model of provenance was formalized, and the classification comparison method was adopted to analyze the lossy compression methods based on Bloom filter and probabilistic packet marking. Lossless compression methods based on arithmetic coding and dictionary were compared. The encoding and decoding algorithms of each method were listed out, and the corresponding merit and demerit were also summarized. The future research prospects of provenance were discussed.
		2016 Vol. 37 (5): 572-577 [Abstract] ( 979 ) [HTML 1KB] [ PDF 1320KB] ( 1859 )

	578	WSN networking technology for airport environment monitoring
		DONG Meng-Meng, WANG Zhu
		To solve the management problem of airport environment monitoring with visual means, an airport network for monitoring was introduced based on the WSN technology to achieve intelligent "unattended and inspection" monitoring mode. In order to facilitate node layout and maintenance, the monitoring area was processed with grid. Considering the actual condition of airport, the biggest jump number, the transmission direction, the maximum forwarding capacity and other constraint conditions were presented to lock the optimal solution quickly and find the best position of relay node. The network load balancing was achieved by threshold method, and the simulation experiment and performance comparison of node layout were carried out through MATLAB. The results show that the proposed relay node placement algorithm with multiple constraints can effectively extend network lifetime to realize network load balancing.
		2016 Vol. 37 (5): 578-584 [Abstract] ( 1161 ) [HTML 1KB] [ PDF 1602KB] ( 1775 )

	585	Application and analysis of FLASH P2P protocol
		LU Li-Li, JI Yi-Mu, SUN Yan-Peng, WANG Ru-Chuan
		To solve the problems that the internet video traffic was increased day by day and the service quality was not guaranteed, a FLASH P2P traffic identification model and optimization scheme were proposed to improve the utilization of network bandwidth resources. FLASH P2P protocol principle，feature extraction and traffic optimization were studied deeply， and the applying effects were analyzed for three major domestic video websites of Youku，Aqiyi and Sohu Video by FLASH P2P protocol interaction. The methods of deploying the video server with FLASH P2P protocol and designing the deployed server to solve optimization problem were specially analyzed. The capturing experiment analysis results show that the proposed analysis method can recognize the flow rate efficiently， and the flow optimization scheme can solve the problem of inadequate video site in the presence of flow localization. The user experience can be improved, and the cost of bandwidth in Internet video company can be decreased.
		2016 Vol. 37 (5): 585-590 [Abstract] ( 1422 ) [HTML 1KB] [ PDF 3113KB] ( 2161 )

	591	Retention effect of ecomedium on nitrogen and phosphorus of agricultural nonpoint source pollution
		JIE Qing-Jie, DU Fu-Yi, SU Hang, FAN Di
		Ecomedium device with layered medium was used to remove nitrogen (N) and phosphorus (P) of agricultural nonpoint source pollution (NPS) caused by rainfall runoff. The experiment results indicate that the system has significant removal efficiency of N and P. In the simulation of rainfall runoff formation under different rainfall intensity running for 0.5 h, 1 h and 3 h, the removal rates of TN are 44.63% to 62.36%, 38.59% to 54.74% and 29.69% to 51.94%, and the removal rates of TP are 67.20% to 88.36%, 56.08% to 81.48% and 38.62% to 70.37%, respectively. The mass concentration of dissolved oxygen (DO) at the vertical direction is 0.23 to 5.61 mg·L-1 to provide ideal environment for microbial nitrificationdenitrification.NH4+N removal is mainly completed by adsorption and microbiological nitrification in the layer of zeolite and ceramic.TN removal is pushed by denitrification in the middle and lower unit. TP removal is achieved by precipitation reaction of phosphate and metal elements in the limestone layer.
		2016 Vol. 37 (5): 591-596 [Abstract] ( 1104 ) [HTML 1KB] [ PDF 1578KB] ( 1776 )

	597	performance of asphalt mixture under freezethaw cycles in cold plateau regions
		ZHOU Xue-Yan, MA Biao, TIAN Yu-Xiang, PENG Shui-Gen, LI Rui
		Based on oneway ANOVA method, the low temperature bending test was conducted to discuss the effects of asphalt species, graded type and nominal maximum particle size on low temperature anticracking performance of asphalt mixture. Taking bending strain energy density as evaluation indicator, the effects of asphalt species on low temperature anticracking performance of asphalt mixture were analyzed by grey relational degree theory. The results show that the low temperature anticracking performance of SBS/SBR modified asphalt mixture is the best and followed by SBS modifying and SBR modifying. Asphalt mixture graded B with skeleton dense structure has better low temperature anti cracking performance than asphalt mixture graded A. The low temperature anticracking performance of asphalt mixture AC13 is better than those of AC20 and AC25. SBS/SBR modified asphalt mixture with skeleton dense structure and little nominal maximum particle size can improve the low temperature anticracking performance of asphalt mixture under freezethaw conditions.
		2016 Vol. 37 (5): 597-603 [Abstract] ( 1081 ) [HTML 1KB] [ PDF 1289KB] ( 1373 )

	604	Effect of loading mode on asphalt mixture dynamic modulus
		CHEN Zhi-Feng, CHEN Zhong-Da, CHANG Yan-Ting, SUN Jian
		To investigate the effect of loading mode on dynamic modulus and determine appropriate loading mode of asphalt mixture dynamic modulus test, the effects of loading frequency, load level and loading clearance time on asphalt mixture dynamic modulus were analyzed on MTS810 testing machine. The results indicate that loading frequency and load level have significant effects on dynamic modulus test results, and load level has more influence on dynamic modulus than that of loading frequency. The loading modes with and without clearance time have little influence on dynamic modulus. Loading mode without clearance time should be used in asphalt mixture indoor dynamic modulus test with loading frequency and load level of 10 Hz and 0.7 MPa, respectively. Under the optimal conditions, the asphalt mixture dynamic modulus value is in the range from 2 000 MPa to 2 700 MPa.
		2016 Vol. 37 (5): 604-609 [Abstract] ( 1266 ) [HTML 1KB] [ PDF 1731KB] ( 1863 )

	610	Shear property of ultrathin wearing course asphalt mixture
		SUN Pei, HAN Sen, LI Xiao-Juan, LI Wei
		The effects of raw material parameters and experimental conditions on shear strength of asphalt mixture were investigated based on uniaxial penetrating test and unconfined compressive test. The effects of SBS dosage, reinforcing agent dosage and gradation type on high temperature stability, low temperature crack resistance, water stability and antistripping performance of asphalt mixture were discussed by laboratory experiments. The results show that the shear property of skeleton structure is better than that of suspended dense structure, and the shear property of SBS modified asphalt mixture is better than that of matrix asphalt mixture. The shear strength of asphalt mixture with optimum asphalt content is large, and reinforcing agent can improve the shear property of mixture effectively. High temperature condition and running vehicle at low speed easily cause the shear failure of ultrathin asphalt wearing course. When SBS dosage and reinforcing agent dosage are respective 4.0% to 4.5% and 0.30% to 0.50%, the ultrathin asphalt wearing course can meet the requirements of shear property, other pavement performance and economy.
		2016 Vol. 37 (5): 610-615 [Abstract] ( 1350 ) [HTML 1KB] [ PDF 1718KB] ( 1613 )

	616	Comprehensive performance evaluation of fiber asphalt mixture based on weight coefficient grey target theory
		ZHANG Hua- Du-Xiao-Hu, WANG De-Cai, ZHANG Hai-Wei
		To investigate the comprehensive performance of fiber asphalt mixture, four types of fiber asphalt mixture with polyester, cellulose, basalt and sepiolite fibers were studied by the tests of wheel tracking, low temperature bending, freezethaw splitting and fatigue stability. Taking dynamic stability, low temperature bending strain, freeze thaw splitting strength ratio, fatigue life and cost per square meter as evaluation indexes, the weight coefficient grey target theory was proposed to determine the best scheme based on road performance and costeffectiveness. The results show that the grey target model can be improved by the introduction of entropy weight method to effectively solve the problems of traditional grey target evaluation model and increase the evaluation accuracy. The basalt fiber asphalt mixture has better road performance and cost effectiveness than other three fiber asphalt mixtures under the same conditions.
		2016 Vol. 37 (5): 616-620 [Abstract] ( 1039 ) [HTML 1KB] [ PDF 1336KB] ( 1620 )

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