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Journal of Jiangsu University(Natural Science Eidtion)

	2018 Vol.39 Issue.5 Published 2018-09-10

	Article

Article

	497	Performance analysis of semi-active suspension with skyhook-inertance control
		ZHANG Xiao-Liang, HE Hai, NIE Jia-Mei, CHEN Long
		Based on a continuously adjustable inerter, a skyhook-inertance control was proposed with the effect equivalent to that of increasing sprung mass. The quarter suspension models of traditional suspension and skyhook inerter suspension were established by Matlab/Simulink, and the properties were compared. The influence of parasitic damping in inerter on the suspension performance was discussed. The results show that compared with traditional suspension under unload condition, 33.0% improvement can be achieved for the natural frequency of skyhook inerter suspension, and the root mean square of body acceleration and the dynamic tyre load of skyhook inerter suspension are improved by 52.3% and 35.5%, respectively. The skyhook inerter suspension can improve the ride comfort of vehicle with better adaptability under unload condition. The smaller the ratio of parasitic damping to inertance is, the more obvious performance improvement is. The skyhook-inertance control can solve the problem that the skyhook damping control has poor adaptability under no-load and full load conditions.
		2018 Vol. 39 (5): 497-502 [Abstract] ( 658 ) [HTML 1KB] [ PDF 2057KB] ( 1094 )

	503	Dilemma zone characteristics of green signal countdown device at intersection based on driver reaction time
		SHEN Jia-Jun, HUANG Xue-Qiang, WANG Xiao-Xiao, CAO Shu
		To explore the characteristics of dilemma of green signal countdown device based on driver reaction time, the calculating model of critical reaction time was constructed， and the dilemma zones were divided into three types based on the relationship between critical reaction time and reaction interval. The distribution intervals were determined, and the length calculation models were established. The actual values were calculated under different displays of green signal countdown device and different driver reaction times. The results indicate that the maximum length is 21.3 m when the countdown time is 10.00 s with travel speed of 35 km?h-1 and with acceleration and deceleration speeds of 1.0 m?s-2 and -1.5 m?s-2, respectively. The dilemma zone moves forward with the decreasing of countdown time, and the length of dilemma zone is increased with the increasing of reaction time at a certain countdown time.
		2018 Vol. 39 (5): 503-506 [Abstract] ( 545 ) [HTML 1KB] [ PDF 1529KB] ( 910 )

	507	Experimental analysis of effect of initial pressure on hydrogen combustion
		CHENG Sha-Li-1, WANG Ying-2
		The hydrogen combustion test loop was constructed, and the experimental data of hydrogen combustion temperature, pressure and burnout rate at different initial pressures were obtained. The velocity of hydrogen flame propagation was obtained by calculating the relationship between extreme value of temperature curve of thermocouple and time. The effects of initial pressure on the flame propagation speed, the maximum combustion temperature, the peak pressure and the hydrogen burnout rate of hydrogen combustion were investigated. The results show that the flame propagation rate is increased, and the maximum temperature is decreased with the increasing of initial pressure at low hydrogen volume concentration. At high hydrogen volume concentration, the flame propagation rate is decreased slightly, and the maximum temperature is increased with the increasing of initial pressure. The initial pressure has slight effect on the maximum temperature in the combustion process. The peak pressure is increased with the increasing of initial pressure, and the initial pressure has no effect on the burnout rate of hydrogen.
		2018 Vol. 39 (5): 507-511 [Abstract] ( 1275 ) [HTML 1KB] [ PDF 2284KB] ( 1614 )

	512	Flow and deposition characteristics of charged particles in DPF channel
		SUN Ping-1, WAN Yao-Feng-1, MENG Jian-1, 2 , FAN Yi-1, XIAO Xue-1
		To investigate the flow and deposition characteristics of charged particles in the diesel particulate filter (DPF), the DPF passes calculation model was established based on FLUENT simulation software, and the discrete phase model was used to simulate the flow and deposition of particles in the channel. The deposition thickness of particles under different charged voltages in the channel was determined by scanning electron microscope to verify the simulation. The results show that with the increasing of charge voltage, the velocity distribution linearly changes along the axis of inlet and outlet tunnel. The higher the charge voltage is, the more obvious the linear change is. The pressure in the inlet tunnel is increased for applied voltage, while the pressure in the outlet tunnel has little change. With the increasing of charge voltage, the wall seepage velocity changes smoothly along the tunnel, and the distribution of particle deposition in the channel tends to be uniform. The higher the voltage is, the more uniform the particles deposition distribution is.
		2018 Vol. 39 (5): 512-516 [Abstract] ( 550 ) [HTML 1KB] [ PDF 2181KB] ( 953 )

	517	Improved design of engine compartment for a commercial vehicle based on CFD
		WANG Lu-Yang-1, WANG Liang-Mo-1, ZOU Xiao-Jun-2, XIE Tao-Xin-2, ZHANG Tang-Bin-2
		To solve the problems of a commercial vehicle with high temperature in condenser and poor thermal environment in engine compartment under idle condition in summer, the porous media model and the multiple reference frame were respectively used to simplify heat exchangers and fan, and the computational fluid dynamics (CFD) model for thermal analysis of engine compartment was established in the finite element software. The CFD software was used to simulate the distribution of flow field and temperature field in engine compartment. The effects of thermal convection and thermal radiation on thermal environment of engine compartment were also considered. According to the flow field and temperature field distribution, the location of heat reflux in engine compartment and the cause of high temperature in heat damage area were determined. Considering the layout and the development cost of entire engine compartment, an improved scheme of adding a spoiler on the condenser side and a deflector at the bottom of condenser was proposed, and the improved scheme was verified by simulation. The simulation results show that the heat reflux is effectively reduced, and the engine compartment thermal environment is significantly improved by adding spoiler and deflector.
		2018 Vol. 39 (5): 517-522 [Abstract] ( 601 ) [HTML 1KB] [ PDF 3188KB] ( 1302 )

	523	Experiment on strengthening mechanisms of impinging streams on spray combustion
		DU Min, HUANG Bin, LU Qi-Cheng, DAI Shi-Jia, WANG Zhu-Liang
		To grasp the key influence factors and influence rule during liquid fuel spray impinging combustion and to investigate the strengthening mechanisms of impinging streams on spray combustion, the spray impinging combustion experiment platform was designed and established. The flame shape was recorded by digital camera, and the flame temperature distribution was measured by thermocouple and infrared thermal imager. The images of flame shape and temperature data were analyzed. The results show that when the same amount of fuel is consumed, the opposed nozzle impinging flame is more stable, and the flame temperature is higher with more continuous distribution. With the increasing of gas velocity, the combustion efficiency and the temperature of impinging flame zone are increased with latter stable value. With the decreasing of air/fuel ratio, the combustion efficiency is increased with latter decreasing, while the temperature of impinging flame zone is increased with latter stable value. With the decreasing of nozzle spacing, the combustion efficiency and the temperature of impinging flame zone are increased with latter decreasing. The closer the nozzle angle is to 180°, the higher the combustion efficiency and the flame temperature are, and the more stable the impinging flame zone is.
		2018 Vol. 39 (5): 523-529 [Abstract] ( 862 ) [HTML 1KB] [ PDF 2884KB] ( 990 )

	530	Design and verification of integrated control strategy for tractor-semitrailer AFS/DYC
		MA Yu-Zhe-1, ZHANG Zu-Feng-2, NIU Zong-Yuan-1, DING Neng-Gen-1
		With tracking yaw rate and bow angle of tractor as targets, the integrated control strategy of active front steering/direct yaw-moment control (AFS/DYC) for vehicle was designed based on the linear monorail vehicle model with three degrees of freedom. The closed-loop simulation model of vehicle was established based on TruckSim and Simulink softwares. The double lane change and hook steering simulations were carried out. The simulation results show that under the double lane change conditions with adhesion coefficient of 0.85 and speed of 105 km?h-1, the vehicle can well track the reference response, and the phenomenon of vibration in open-loop system is weakened with improved path tracking. In hooking steering simulation, when the adhesion coefficient is 0.30 with speed of 55 km?h-1, the closed-loop system runs well, and vehicle can enter hook steering without sideslipping and folding. The designed AFS/DYC control strategy is effective and can improve the vehicle yaw stability.
		2018 Vol. 39 (5): 530-536 [Abstract] ( 694 ) [HTML 1KB] [ PDF 2863KB] ( 1051 )

	537	Effect of immersion cooling liquids on electrical performance of triple-junction concentrator solar cells
		HAN Xin-Yue, CHEN Xiao-Bin, GUO Yong-Jie, XUE Deng-Shuai
		To apply the direct liquid-immersion cooling to the high concentrating photovoltaic systems with densely packed III-V cells module, the effects of the candidate liquid type for immersing III-V triple-junction (TJ) solar cells cooling and the liquid film thickness on the electrical performance of GaInP/GaInAs/Ge TJ concentrator solar cells were investigated. The mechanism of the increasing efficiency of TJ solar cell in the presence of liquid layer was explored. The results show that the effect of liquid layer on short circuit current of TJ solar cell is much greater than that on open circuit voltage. With the increasing of liquid layer thickness, the efficiency of TJ solar cell is increased with latter decreasing, and the maximum efficiency is obtained for 4.0 mm liquid layer thickness. The efficiency of TJ solar cell with cosmetic grade white oil for 4 mm thickness is increased by 8.99%. The improvement is attributed to the optical effect and the electrical effect caused by the liquid layer on the solar cell surface, which are respectively connected with the reduction of light reflection and the decrease of surface recombination velocity due to the adsorption of liquid molecules.
		2018 Vol. 39 (5): 537-542 [Abstract] ( 506 ) [HTML 1KB] [ PDF 1984KB] ( 865 )

	543	Review on applications of load cells in precision agriculture machinery
		TANG Jian-Hua-1, CHEN Shu-Ren-2, HUA Yin-Qun-3, YANG Ji-Chang-1
		Sensor technology is one of the most important technologies to implement precision agriculture industrialization in China. Load cell is one of sensors which have wide application in precision agriculture field. Based on the four stages of precision agriculture of soil preparation, precision seeding, precision crop management and yield monitor/mapping, the applications and research progresses of load cells were summarized. The application of load cells in precision agriculture was analyzed, and three critical problems of reliability, stability and dynamic weighing precision were proposed to be solved. The common and key technologies of sensitive mechanism, manufacturing technology and measurement technology were also discussed.
		2018 Vol. 39 (5): 543-549 [Abstract] ( 543 ) [HTML 1KB] [ PDF 1295KB] ( 1009 )

	550	Dynamic characteristic of planetary gear transmission system of wind turbine under time-varying speed conditions
		TANG You-Fu, WANG Lei, ZOU Long-Qing
		Considering the time-varying speed working conditions, the dynamic model was established by lumped-parameter method of planetary gear transmission system. The time-varying meshing stiffness was transformed into the function of meshing frequency by Fourier series. According to the simulation curve of rotation speed, the effect of variable speed on the time-varying meshing stiffness of gear pair was analyzed. The method of Runge-Kutta was applied to calculate the dynamic response of gears in transmission system. The experiment signal was analyzed based on the wind turbine gear box test bed, and the established dynamic model of wind turbine planetary gear under time-varying speed was verified.
		2018 Vol. 39 (5): 550-555 [Abstract] ( 922 ) [HTML 1KB] [ PDF 3212KB] ( 1504 )

	556	Characteristic simulation and structure optimization of drum-type sludge dryer
		ZHU Gui-Hua, XU Hong-Wei, WANG Jian-Ye, LIU Ying-Jiao, PENG Nan-Hui
		To solve the problem of low thermal efficiency in the process of drying sludge in roller dryer, the drying process was simulated by Fluent software and EDEM softwares. Considering the collision of granular material and the thermal traction to material, the influence of roller structure on motion path and drying efficiency of materials was investigated. The concept of virtual heat absorption was put forward to describe the complex gas-particle two-phase heat exchange process when the material was dried by heating. By simulation， the effects of hopper plate distribution and feed screw length on motion path and drying efficiency of material in the roller were analyzed to conduct design optimization. The results demonstrate that for the roller dryer with a certain specification, the distribution of hopper plates in the roller dryer is important affecting factor on thermal efficiency. After improving the distribution of hopper plate and the length of feed screw, the thermal efficiency of roller dryer can be increased by 11.2%.
		2018 Vol. 39 (5): 556-562 [Abstract] ( 638 ) [HTML 1KB] [ PDF 2017KB] ( 1091 )

	563	Design and analysis of rope driven joint for upper limb rehabilitation robot
		YANG Qi-Zhi-1, SUN Meng-Tao-1, MA Xin-Po-1, CAI Jing-1, ZHAO Xin-Gang-2
		To solve the problems of easy slippage by elasticity and easy accumulation of errors in rope driving, a generalized driving method of "rope+toothed belt" was proposed to convert the traditional rigid power transmission of motor plus gear and reducer into flexible transmission. The pull force of wire rope was calculated, and the friction coefficient between wire rope and outer hose was analyzed by the friction compensation method to obtain the relationship between friction force of steel wire rope and load. The combination of the same steel wire rope and the rope jacket was tested for different bending degrees. The length of steel wire rope in the hose was changed, and the load was applied at the end. The steel wire rope was installed on the fixing plate, and the size of wire rope was determined by measuring the pulling force and the friction force. The ADAMS was used to simulate the wire ropes of rope-driven joints. The results show that the influence of bending degree on the friction force of steel wire rope is negligible, and the friction force of steel wire rope is proportional to the length and load. The correctness of the theoretical analysis is verified by the simulation. The maximum tight edge pressure of rope is 8 N, and the actual friction force is 7.6 N. The 304 stainless steel is adopted for wire rope with the diameter of 1.5 mm and the maximum load of 25 kg.
		2018 Vol. 39 (5): 563-569 [Abstract] ( 1185 ) [HTML 1KB] [ PDF 1869KB] ( 1673 )

	570	Application of KPCA-KELM in short-term traffic flow prediction
		LI Jun, WANG Qiu-Li
		To improve convergence speed and accuracy of short-term traffic flow prediction, a method of KPCA-KELM combining kernel principal component analysis (KPCA) and kernel extreme learning machine (KELM) was proposed. By the KPCA method, the nonlinear principal elements of model input in the feature space were effectively extracted to realize the data pre-processing. In the KELM method, the nodes number of network hidden layer was not set, and the output weight of network was calculated by the regularized least squares algorithm to achieve good promotion with extremely fast learning speed. The advantages of KPCA and KELM were combined in the proposed method. The traffic flow prediction data measured by the ITS Research Group of the University of Washington in Seattle and the Beijing Traffic Administration were tested, and the KPCA-KELM method was compared with single KELM, LSSVM, SVM, KPCA-LSSVM, KPCA-SVM and other prediction methods. The experimental results show that the convergence speed and prediction accuracy of the proposed method are better than those of other comparison methods. For the single-step prediction of the measured traffic volume data of Beijing Transportation Administration, the prediction accuracy of the KPCA-KELM method is 1.991 3 higher than that of the KELM method.
		2018 Vol. 39 (5): 570-575 [Abstract] ( 922 ) [HTML 1KB] [ PDF 1693KB] ( 1009 )

	576	An improved predicate invention method based on SCAD
		ZHENG Xiao-Dong-1, PAN Jing-Min-2, HU Han-Hui-1
		To solve the problem of error cascades of traditional predicate invention method in inductive logic programming (ILP), an improved approach was proposed based on smoothly clipped absolute deviation penalty (SCAD) regularized sparsity. Instead of explicitly creating new predicates, the predicate invention method implicitly grouped closely-related rules by regularized sparsity to regularize the parameters together. The regularized sparse model of SCAD was introduced into the soft predicate invention. For the unbiased sparseness, the influence of SCAD on soft predicate invention results was analyzed. The experiments were completed based on the dataset of European royalty family ties, and the values of μ and α were determined to improve the knowledge base. The results show that the proposed approach can effectively overcome the difficulty of error cascades, and the method can improve the mean average precision in predicate invention and shorten the query time of knowledge base. The mean average precision of the approach based on SCAD regularized sparsity is 0.798, which is more higher than the soft predicate invention method of 0.726 based on Laplacian regularization.
		2018 Vol. 39 (5): 576-580 [Abstract] ( 570 ) [HTML 1KB] [ PDF 1510KB] ( 882 )

	581	A classification algorithm for big data based on parallel immune network
		FAN Da-Peng-1, 2 , ZHANG Feng-Bin-1
		To solve the problem of processing difficulty for big data in the serial immune network algorithm, the parallel immune network training and classification model were proposed, and a parallel immune network classification algorithm was designed under the framework of parallel Spark. The background knowledge of intrusion detection big data was introduced to establish Ainet parallel algorithm framework, and the algorithm steps of the proposed algorithm were described in detail. The cup99 intrusion detection data set was adopted in the experiments, and the Ainet algorithm was compared with other algorithms. The experimental results show that compared with the serial Ainet algorithm, the parallel Ainet algorithm can reduce the training time by 11/12 and the detection time by 19/20 and can improve the accuracy by 10% and the detection rate by 5% with reduced false alarm rate of 20%. The parallel Ainet algorithm achieves good effect in all aspects. The experimental verification of classification illuminates that the number of training data set has sensitive feature. The parallel Ainet algorithm outperforms other algorithms in accuracy, detection rate and false alarm rate with poor run time .
		2018 Vol. 39 (5): 581-585 [Abstract] ( 463 ) [HTML 1KB] [ PDF 1339KB] ( 735 )

	586	Development and application of a novel fluorescent probe for hypochlorous acid with high selectivity
		HAN Zhi-Xiang, CAI Chun-Xiang, ZHANG Gong-Bo, JIANG Meng-Yun, LI Hui
		The 7-(diethylamino)-N′-(2,4-dinitrophenyl)-2-oxo-2H-chromene-3-carbohydrazide-based fluorescent probe 1 was reasonably designed, synthesized and employed for the detection of hypochlorous acid (HOCl) in aqueous solution and living cells. The results show that the probe 1 exhibits almost none fluorescence due to the strong quenching effect of dinitrophenyl group and the unique rotation of N—N single bond in acetohydrazide group. With the addition of HOCl, the significant fluorescence enhancement is obtained with notable fluorescence color changing from dark to bright blue. In the presence of 100 μmol?L-1 HOCl, the fluorescence intensity of probe 1 is enhanced 134 times. The relationship between fluorescence intensity of probe 1 at 463 nm and HOCl concentration shows linear enhancement from 0.1 μmol?L-1 to 40.0 μmol?L-1, and the detection limit can reach 0.052 μmol?L-1. Probe 1 shows specific recognition to HOCl with fast response. The probe 1 can be successfully applied to visualize HOCl in living cells with the aid of fluorescence imaging.
		2018 Vol. 39 (5): 586-590 [Abstract] ( 644 ) [HTML 1KB] [ PDF 2107KB] ( 1069 )

	591	Effects of sintering temperature on Fe-based soft magnetic composite prepared by spark plasma sintering
		XIE Yu-Ye-1, 2 , YAN Biao-1, 2
		Fe powders coated with 10％ MnZnFe2O4 were fabricated by dry-type ball milling. The resultant composite powders were consolidated to magnetic powder cores by spark plasma sintering (SPS). The effects of sintering temperature on microstructure, density and magnetic properties were investigated. The microstructure and the magnetic properties of Fe／MnZnFe2O4 powder cores at different sintering temperatures were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and B-H analyzer. The experimental results show that Fe／MnZnFe2O4 powder core sintered at 700 ℃ for 5 min exhibits excellent soft magnetic properties. Core losses are decreased to nearly 1／10 of those of Fe powder core due to the insulation effect of MnZnFe2O4 particles, which significantly expands the applicable frequency range.
		2018 Vol. 39 (5): 591-595 [Abstract] ( 644 ) [HTML 1KB] [ PDF 2128KB] ( 1264 )

	596	Mechanical mechanism of new metro tunnel passing under existing metro tunnel
		WU Ke-1, CUI Shuai-Shuai-1, ZHANG Qian-Jin-1, YU Ya-Lin-1, ZHANG Le-Wen-2
		For the new metro tunnel passing under the existing metro tunnel, based on the three-dimensional numerical analysis method, the field monitoring data was compared to verify the simulation reliability. The effects of three tunnel construction schemes of entire section method, benching tunneling construction method and shield method on existing metro structures were investigated, and the effective deformation control measures were proposed. The results show that compared with the entire section method and the benching tunneling construction method, the shield method can effectively reduce the earth surface and existing metro tunnel settlements and the principal stress of existing tunnel structure, and the convergence time of settlement is shorter than those of other two schemes. Through effective grouting reinforcement measures, the surface subsidence, the uneven settlement of existing metro tunnel and the settlement of natural rock formations can be drastically reduced. In the process of construction, the reasonable selection of grouting reinforcement area should be combined with the actual situation to avoid material waste.
		2018 Vol. 39 (5): 596-603 [Abstract] ( 627 ) [HTML 1KB] [ PDF 3247KB] ( 916 )

	604	Influence of spatial distribution on road performance of asphalt mixtures
		WANG Jia-Shu, GAO Ying
		The volume indexes of VMA and VV were chosen to characterize the voidage of asphalt mixtures, and the VCAratio was used to characterize the compactness of skeleton structure with the indexes of high temperature performance, low temperature performance and water stability to establish the relationship between spatial distribution and road performance. The results show that VMA and VCAratio can well distinguish the spatial distribution of mixtures. The low temperature performance and the water stability of asphalt mixtures are greatly affected by VMA, while the high temperature stability is less sensitive to VMA. The VCAratio has great effect on the high temperature stability with less effect on the low temperature performance and the water stability. When the value of VMA is increased much, the low temperature performance and the water stability of asphalt mixtures are decreased sharply. With the decreasing of VCAratio, the high temperature performance is increased gradually. At the critical point of VCAratio equal to 1, the high temperature performance changes dramatically.
		2018 Vol. 39 (5): 604-610 [Abstract] ( 466 ) [HTML 1KB] [ PDF 2030KB] ( 1367 )

	611	Road performance of color reflective asphalt pavement coating
		ZHANG Zheng-Qi-1, ZHANG Shi-Hao-1, GUO Da-Tong-2, LI Liu-Lin-3
		To improve the high temperature stability of asphalt pavement and alleviate the urban heat island effect, a color reflective asphalt pavement coating was developed. The amount of raw materials and the preparation process of coating were determined, and the cooling effects of color coating were tested and analyzed. The effect of coating on the surface function of pavement was tested, and the improvement measures were put forward. The results show that the cooling effect is the best when the volume ratio of TiO2 to film forming base is 2.8%. The cooling effect of the coating is improved with the increasing of color filler, while the cooling effect tends to be unchanged when the color filler is larger than a certain threshold. The volume ratios of color filler to film forming base are recommended from the economic and cooling effect with red of 2.7%, green of 2.6% and yellow of 3.2%. In order to improve the anti-slide performance and abrasion resistance of the coating, 0.48~0.50 kg?m-2 mechanical sand should be sprayed in the middle part of coating, and the light calcium carbonate with 30% coating quality should be added.
		2018 Vol. 39 (5): 611-616 [Abstract] ( 742 ) [HTML 1KB] [ PDF 1961KB] ( 1453 )

	617	Improvements of engineering properties for sulfur-containing lime soil
		LU Pei-Xia-1, 2
		To solve the obvious shrinkage and temperature shrinkage of lime soil with easy cracking of road base layer, based on the viscous filling of the #1 construction in the West Extension Line project of Wenchang Road, Yangzhou, the unconfined compressive strength of lime soil was investigated, and the effects of slag and fly ash on the strength of lime soil were analyzed by SANS universal testing machine. The results show that the unconfined compressive strength of sulfur-containing lime soil is increased with the increasing of slag content, and the unconfined compressive strength of sulfur-containing lime soil with the age less than 180 days is increased greatly and increased slightly with the age more than 180 days. With the increasing of fly ash content, the unconfined compressive strength of sulfur-containing lime soil with the age less than 30 days is increased linearly, while that with the age more than 30 days is decreased continuously.
		2018 Vol. 39 (5): 617-620 [Abstract] ( 531 ) [HTML 1KB] [ PDF 2336KB] ( 678 )

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