Journal of Jiangsu University(Natural Science Eidtion)

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Journal of Jiangsu University(Natural Science Eidtion)

	2019 Vol.40 Issue.5 Published 2019-09-10

	Article

Article

	497	Effect of extrusion grinding on injector flow and atomization performance
		WANG Zhong, WANG Kai, WANG Peng, LIU Shuai, TANG Zhi-Ming, LOU Di-Ming
		To investigate the influence of extrusion grinding process on nozzle flow and atomization of injector, under the process conditions with different extrusion grinding processing time and system pressure, the spray test picture of injector was taken by the spray test bench and the high speed camera. The injector performance test bench and the EFS single injection gauge were used to measure the flow rate of orifice. The change rules of the spray angle, the spray penetration, primary and secondary breakup and the spray difference were analyzed. The results show that with the increasing of extrusion grinding time and system pressure, the extrusion grinding increment of the nozzle is increased gradually. When the extrusion grinding increment is increased from 5% to 20%, the spray angle is decreased from 14.8° to 12.6°. The spray penetration is increased from 36.20 mm to 44.20 mm, and the penetration length of primary breakup is increased from 3.93 mm to 22.20 mm with increased penetration length proportion of primary breakup. The spray difference is increased with the increasing of extrusion grinding increment, which is not beneficial to the uniform distribution of fuel in the combustion chamber.
		2019 Vol. 40 (5): 497-503 [Abstract] ( 834 ) [HTML 1KB] [ PDF 1922KB] ( 639 )

	504	Seat suspension control of wheel loader based on damping state switching
		TAO Wei, LIU Zhi-Qiang
		To improve the ride comfort of wheel loader driver during operation, a wheel loader semiactive seat suspension was proposed based on the damping multistate switching damper. The design principle and the oil flow behaviors of target damper were analyzed to establish the mathematical model of damper. The damper rebound and the compression damping coefficients under four damping states were obtained by the simulation analyses, and the hybrid dynamical model of wheel loader semiactive seat suspension was also established. The hybrid model predictive control strategy with fuzzy adaptive adjustment of weight coefficients for the semiactive seat suspension was designed, and the control performance simulation analysis was conducted under random road excitation. The simulation results show that the proposed wheel loader semiactive seat suspension and the control strategy can effectively reduce the seat vertical vibration by 35.71% and reduce the suspension dynamical deflection by 30.88%, and the ride comfort of wheel loader driver during operation is improved significantly.
		2019 Vol. 40 (5): 504-510 [Abstract] ( 863 ) [HTML 1KB] [ PDF 1946KB] ( 592 )

	511	Development of intelligent design platform for special vehicle tank
		LI Tao, CHEN Guang-Yao
		To solve the design workload and difficulty due to the large dimension difference of tanks with different functions, the indepth CATIA development was conducted. The special vehicle tank was used as a model to achieve the intelligent drawing of the feature model. Combined with the finite element analysis software, the generated model was optimized and improved. The intelligent design concept was applied to the process of system design, and the knowledge data in the development process was integrated and stored in the designed knowledge base. The database was established by various existing information, and the intelligent design platform of special automobile tank with good interactive interface was developed to integrate the design of special vehicle tank body into the data. The results show that the indepth development of the commonly used threedimensional modeling software can be conducted to realize the intelligent drawing of the target model, and the work efficiency of designer can be greatly improved with shortened product development cycle.
		2019 Vol. 40 (5): 511-517 [Abstract] ( 846 ) [HTML 1KB] [ PDF 2774KB] ( 2627 )

	518	Oxidation and catalytic characteristics of particulate with O₂／NO₂ condition
		FANG Jia, JIANG Yuan, MENG Zhong-Wei, QIN Yuan, LI Jian
		The effects of catalyst on the oxidation characteristics of carbon black were investigated by the thermogravimetric analyzer under different O₂ volume fractions and NO₂atmosphere. The oxidation kinetics analyses were respectively conducted by the ABSW in differential method and the Arrhenius method. The results show that in the early stage of oxidation from 45 to 350 ℃, the activation energy of carbon black is decreased from 183 kJ·mol^-1 to 111 kJ·mol^-1 with the increasing of NO₂ concentration. Under the catalytic conditions, the activation energy is decreased from 162 kJ·mol^-1 to 109 kJ·mol^-1. At the stage of postoxidation from 350 to 800 ℃, the activation energy of particles is decreased with the increasing of NO₂concentration, and is decreased most under the catalytic state with decreasing value from 28 to 52 kJ·mol^-1. In the whole oxidation process from 45 to 800 ℃, the activation energy of carbon black is decreased with latter increasing with the increasing of NO₂ concentration. Under the action of catalyst, the most decreasing of activation energy can reach 93 kJ·mol^-1 when the volume fraction of NO2 is 1×10^-3.
		2019 Vol. 40 (5): 518-523 [Abstract] ( 721 ) [HTML 1KB] [ PDF 2410KB] ( 619 )

	524	Distance control of pure electric vehicle based on fuzzy control
		ZHANG Xin-Feng, WANG Ao-Te, CHEN Jian-Wei, ZHU Ming
		The motor model and the dynamic safety distance model were proposed, and the vehicle dynamics model of pure electric vehicle was built on the Carsim platform. The fuzzy distance controller was designed, and the Simulink and Carsim joint simulation platform was established to conduct the simulation analysis of the pure electric vehicle fuzzy distance controller. The results show that the controlled vehicle can ensure the safe distance more than 5 m from the preceding vehicle compared with the vehicle without controller. When the starting distance of preceding vehicle are 50，80 and 100 m, the minimum distance can be controlled more than 5 m. Under the condition of cutting in the adjacent lanes, the rearend collision and other collisions can be effectively prevented, and the active safety of vehicle and the efficiency of road passage can be greatly improved.
		2019 Vol. 40 (5): 524-530 [Abstract] ( 1311 ) [HTML 1KB] [ PDF 3044KB] ( 628 )

	531	Characteristics analysis of solid-liquid two-phase flow in semi open cutting pump
		CAO Wei-Dong, JIANG Xin, ZHANG Qian, XU Yu-Min
		To deeply understand the solidliquid twophase flow state and predict the wear of the semi open cutting pump, the standard kε turbulence model was used based on the ANSYS CFX. The distributions of particle volume and velocity of blades under different solid volume fractions and flow rates were investigated, and the distributions of particle volume and velocity of rotating blades were also analyzed. The effects of solid and liquid phases on inner flow field were discussed. The results show that the velocity distribution of solid phase on the blade pressure surface is lower than that on the suction surface, while the volume fraction is larger than that on the suction surface. The largest velocity of solid phase is obtained on the blade tail, while the largest solid volume fraction of solid phase is obtained at the blade head. For the rotating blade, the solid phase velocities at the exit of working face and the back face near rotating shaft are large, while the solid volume fraction is large at the working surface near the rotating shaft with severe wear. The flow conditions have obvious effects on pressure distribution, velocity distribution and solid distribution.
		2019 Vol. 40 (5): 531-537 [Abstract] ( 744 ) [HTML 1KB] [ PDF 3367KB] ( 589 )

	538	Scale model experiment of stability for high-clearance sprayer affected by multifactors
		DING Kai, FENG Jing-An, WANG Wei-Bing, YU Jun-Zhi
		For the complex working environment of highclearance sprayer, 3D printing technology and similarity criterion of proportional model were used to establish an experimental testing system for wheelground load of sprayer. An evaluation index for the horizontalslope ground of sprayer was proposed based on wheel off the ground. The mixedlevel Taguchi experiment was designed with the terrain roughness in classes E and F as noise factors and with tank position, speed, tread, liquidfilled ratio and slope as control factors. For different instability characteristics, different S／N calculation methods were selected to determine the maximum instability experimental conditions for sprayer under horizontalslope ground. The experimental results show that the linear regression coefficient is above 0.91 with NSE efficiency coefficient above 0.85 and average relative error within 6.5％, which illuminates that the stability evaluation index on sloping ground by Taguchi method is consistent with the measured values.
		2019 Vol. 40 (5): 538-546 [Abstract] ( 1076 ) [HTML 1KB] [ PDF 3550KB] ( 574 )

	547	System performance of new environment-friendly refrigerants
		PENG Xiao-Tian, FENG Shi-Yu, LI Chao-Yue, WANG Chen-Chen, LIU Wei-Hua
		To investigate the effects of system parameters and regenerator cycle on the performance of new refrigerants of R1234yf, R1234ze, R152a, R448A, R290 and R600，two simulation models with and without regenerator cycle were established based on VapCyc software，and the models were verified by experiments. With the six refrigerants, the effects of overheating temperature, ambient temperature, compressor speed, air volume of condenser side and evaporator side on system refrigeration capacity and COP variation were simulated. The results show that the refrigeration capacity is decreased with the increasing of overheating temperature and external ambient temperature, while the refrigeration capacity is increased with the increasing of compressor speed, air volume on the condenser side and air volume on the evaporator side. The COP is decreased with the increasing of overheating temperature, ambient temperature and air volume on the condenser side,while the COP is increased with the increasing of compressor speed and air volume on the evaporator side. Under the same operating conditions, the decreasing sequence of refrigerating capacity is from R448A， R290， R152a ，R1234yf， R1234ze to R600a, and the decreasing sequence of COP is from R600a， R1234ze ， R152a ， R1234yf ， R290 to R448A. For the above six refrigerant systems, the regenerator cycle is beneficial to the system performance. The cooling capacity and the COP of the system are respectively increased by 10% and 6%, and it is the most advantageous to improve the performance of R600a system.
		2019 Vol. 40 (5): 547-552 [Abstract] ( 1141 ) [HTML 1KB] [ PDF 2128KB] ( 598 )

	553	Human electric shock law based on pig electric shock experiment
		LI Chun-Lan, YE Hao, WANG Cheng-Bin, WANG Hai-Yang
		To solve the problem that electric shock test could not be done by human body, a method based on electric shock test data of pigs was proposed to investigate the law of human electric shock. The data of DALZIEL letgo currentfrequency characteristic curves were used as training samples, and the prediction model of adult letgo current was obtained by BP neural network. Based on the electric shock test data of pigs with different weights, the regression analysis method was used to establish the relationship between pig electric current and weight. According to the high similarity between human and pig in terms of physiology, anatomy and electrical properties, the electric shock channel was constructed based on the bioelectromagnetics, and the mapping relationship between adult and experimental pig impedance was obtained by cylinder model to derive the relationship model between electric shock current and body weight at 36 V and 50 Hz. The research results show that the electric current passing through body is positively related to the weight of human body when the electric shock occurs. Under the condition of 36 V and 50 Hz, the electric current of 50 kg adult is 17.02 mA, and the letgo current of 50 kg adult by the BP neural network model is 16.22 mA, which illuminates the error is 0.8 mA.
		2019 Vol. 40 (5): 553-558 [Abstract] ( 867 ) [HTML 1KB] [ PDF 1674KB] ( 578 )

	559	Aircraft taxiing path planning based on multiagent system
		TANG Yong, HE Dong-Lin, ZHU Xin-Ping
		To solve the initial path planning problem of aircraft taxiing in advanced surface movement guidance and control system (ASMGCS), a method was proposed based on multiagent system(MAS) simulation to realize the shortest path planning from any starting point to destination on airport surface. To overcome the shortage of traditional directed graph model in describing the airport surface operation, a taxiing resource graph model was proposed to model the airport control area, which could not only efficiently model the airport control area, but also make the model not too complicated. The shortest path planning MAS was designed. Based on the reproductive ability and the exclusive attributes of aircraft agent in the resource node agent, the resource nodes could be traversed, and each node was ensured to be visited at most once. Anylogic was used to develop a multiagent simulation system for airport surface initial path planning. The simulation results show that the designed MAS system can not only quickly calculate the shortest path, but also visualize the path planning process. The algorithm complexity is the same as Dijkstra algorithm, which meets the initial path planning requirements of ASMGCS.
		2019 Vol. 40 (5): 559-565 [Abstract] ( 1230 ) [HTML 1KB] [ PDF 2052KB] ( 674 )

	566	Characteristics of CO2 emission in sewage treatment plant with Biolak process
		JIE Qing-Jie, CHEN Shi-Long, LI Qing, LI Hong-Xin, WANG La
		To realize the meticulous control of carbon emissions in the sewage treatment plant, based on the CO2 concentration monitoring data of Zhenjiang Dantu Wastewater Treatment Plant, the CO2 concentration distribution map of the study area was drawn with the analyses of spatial and temporal characteristics of CO2 concentration distribution as core. The CO2 changes in the wastewater treatment plant were compared longitudinally and spatially, and the effects of meteorological factors, process conditions and operating parameters on the CO2 concentration in each study area were analyzed. The results show that in the spatial distribution, the CO2 concentration of the process unit measurement points is higher than those of other areas in the plant, and the CO2 concentration of the biochemical pool is generally higher than other structures. The study area shows varying degrees of seasonality in the time distribution, and the local CO2 concentration in the sewage treatment plant is obviously affected by influent water quality, temperature and wind speed.
		2019 Vol. 40 (5): 566-572 [Abstract] ( 1263 ) [HTML 1KB] [ PDF 3410KB] ( 614 )

	573	Recognition algorithm of breast pathological images based on convolutional neural network
		LING Yu, SUN Zi-Qiang
		To assist pathologists in diagnosing breast tumors, a method was proposed to automatically recognize and analyze breast pathological images by computers. With BreaKHis as data sample, the improved network model of VGG19A was proposed based on the convolutional neural network model of VGG19. By adding BN algorithm before activation function in convolution layer and adding dropconnect layer in full connection layer, the performance of network model was optimized to improve the recognition accuracy of network model. Considering that the transfer learning method could make the network model learn pathological features more fully, the method was introduced into the training of VGG19A network. The network was applied to the recognition of breast pathological images, and PFTAS+QDA, PFTAS+SVM, PFTAS+RF, SingleTask CNN, AlexNet and VGG19 algorithms were used in comparative experiments. The results show that compared with the existing methods, the proposed method can improve the accuracy and generalization performance of image recognition, which has important practical application value.
		2019 Vol. 40 (5): 573-578 [Abstract] ( 654 ) [HTML 1KB] [ PDF 2027KB] ( 2170 )

	579	Fault diagnosis method for inwheel motor based on wolf pack algorithm
		XUE Hong-Tao, ZHOU Yu, WANG Man, LI Zhong-Xing
		In view of the complex and changeable driving conditions of electric vehicles and the special operating environment of inwheel motors, it is very important to develop an effective fault diagnosis method for inwheel motors. Because the information transmitted by single feature parameter often had limitations, a multifeature parameter fusion diagnosis method was proposed based on the wolf pack algorithm. Based on the overlap degree of Weibull distribution of common fault diagnosis feature parameters in different operation states of inwheel motors, several feature parameters were chosen with high sensitivity, and several feature parameters were fused through wolf pack algorithm to diagnose faults and fault degree according to Weibull distribution of fusion information of multifeature parameters. The method was verified by building a leakage fault test system of inwheel motor. The experimental data show that the method of multifeature parameter fusion diagnosis based on wolf pack algorithm can effectively identify and distinguish the electrical faults of inwheel motor.
		2019 Vol. 40 (5): 579-584 [Abstract] ( 859 ) [HTML 1KB] [ PDF 1614KB] ( 629 )

	585	Preparation and adsorption properties of hydrogen-bonded molecular imprinting hypercrosslinked polymeric adsorbent for Matrine
		YUAN Xin-Hua, LIU Dun-Shun, LIU Yi, YI Min, TANG Kun, CHEN Yan-Qiu
		Adding the templet molecule of Matrine in post crosslinking reaction, a novel molecular imprinting hypercrosslinked polymeric (MIP) adsorbent was successfully prepared and modified by phenol group, and the nonimprinting hypercrosslinked polymeric (NIP) adsorbent was also prepared. The physics performance and the surface morphology were determined. The static equilibrium adsorptions of Matrine and Cytisine and the adsorption selectivity of Matrine onto MIP resin in aqueous solution were investigated. The adsorption behaviors of Matrine and Cytisine onto MIP resin were compared with those onto NIP resin. The results show that compared with NIP resin, the specific surface area is decreased, while the pore size and the pore volume are increased with more regular pore structure. The selective coefficients of Matrine onto MIP resin are high with the maximum value of 15.67, which illuminates that MIP resin has high recognition ability to Matrine. The static equilibrium adsorption isotherms can well fit Langmuir and Freundlich equations, and the fitting results show that MIP resin has much higher adsorption ability to Matrine than NIP resin.
		2019 Vol. 40 (5): 585-590 [Abstract] ( 1125 ) [HTML 1KB] [ PDF 1647KB] ( 483 )

	591	Development of a NIR fluorescent probe for hydrogen sulfide detection
		HAN Zhi-Xiang, JIANG Meng-Yun, LIU Jia-Min, GU Yu-Xing
		A nearinfrared region（NIR） fluorescent probe 1 was constructed with hemicyanine attached to 7nitro2,1,3benzoxadiazole (NBD) via ether bond and employed to detect the exogenous and endogenous H2S in live cells. Probe 1 is nonfluorescent due to the quenching effect of NBD. However, with the addition of H2S, the H2Slabile NBD ether bond is cleaved by thiolysis, and hemicyanine is released to lead to the enhancement of fluorescence intensity at 725 nm. In the presence of 10 equivalent of H2S, the 8.5fold fluorescence intensity enhancement is occurred. Probe 1 shows good linearity with H2S concentration when it ranges from 0.1 μmol·L-1 to 100.0 μmol·L-1 with R2 of 0.995 2. The detection limit is 0.03 μmol·L-1. Probe 1 shows NIR excitation and emission with high sensitivity, fast response and high selectivity. The constructed probe 1 can be used for monitoring and imaging exogenous and endogenous H2S in live cells.
		2019 Vol. 40 (5): 591-595 [Abstract] ( 1000 ) [HTML 1KB] [ PDF 2414KB] ( 593 )

	596	Construction method of shallow tunnel with large section downtraversing existing road
		DENG Xiang-Hui, YANG Jun, WANG Rui
		To solve the problems of easy damaging and destructing to endanger the road and traffic safety, in the blasting excavation process of large section shallow tunnel downtraversing existing road, the Guanlinzi Tunnel downtraversing the 316 National Road in the BaojiHanzhong Expressway was selected as research objective. The construction method of bridging on the pavement, advanced reinforcement, excavation by steps, monitoring and feedback information was proposed based on the project. Under normal traffic on the road, the finite element method was used to simulate the road surface settlement with and without steel frame bridge. Combined with the monitoring results of blasting vibration in the field, the safety and the feasibility of CRD method were compared and analyzed. The results show that the surface subsidence value without steel frame bridge is larger than that with steel frame bridge, and the value exceeds 2/3 permissible limits of the standard. The relative error between simulated value and measure value is 95.7%. Under the condition with steel frame bridge, the error between the simulated ground settlement and the measured value is from 2.7% to 12.4%, and the average relative error is 6.1%， and much lower than that of nonpaving steel bridges, which shows that it is very effective to put forward the construction method of laying steel bridges.
		2019 Vol. 40 (5): 596-602 [Abstract] ( 839 ) [HTML 1KB] [ PDF 1927KB] ( 572 )

	603	A fatigue damage model of CFRP tendon bonded anchors
		XIE Gui-Hua, FENG Qian-Hong, TANG Yong-Sheng, LIU Rong-Gui, BIAN Yu-Long
		Series of constant amplitude fatigue loading tests were carried out on two types of CFRP tendon bonded anchorage systems. The influence of load ratio on fatigue response was investigated by backside strain technology. The prediction model of fatigue damage for the systems with constant amplitude load was deduced based on Goodman equation. The effect of load ratio on fatigue behavior of bonded anchors was investigated by experimental and numerical approaches. The results show that the prediction data are in good agreement with the experimental data. The change of back strain in the fatigue process of bonded anchorage system can well reflect the fatigue damage in the anchorage system, which proves that the back strain gauge technology is suitable for the bonded anchorage system. The fatigue damage model based on backside strain technology can reasonably simulate the effect of load ratio on fatigue response of bonded anchorage systems.
		2019 Vol. 40 (5): 603-607 [Abstract] ( 895 ) [HTML 1KB] [ PDF 1692KB] ( 632 )

	608	Thermal parameters inversion in hydration thermal process of concrete box girder based on SPSO algorithm
		SUN Wei-Gang, ZHANG Guang-Lei, LIU Lai-Jun, QIN Yu, ZHANG Xiao-Yu
		To improve the accuracy and convenience of obtaining thermal parameters for hydration thermal simulation analysis of concrete box girder by field and laboratory tests, the hydration heat process of a concrete box girder was used as experimental background. The literature research results were combined to determine the range of thermal parameters of concrete box girder, and the variance analysis was used to determine the sensitivity of each parameter to temperature and sort the parameters with high sensitivity as the parameters to be inverted. Based on standard particle swarm optimization(SPSO) algorithm and compared with genetic algorithm(GA), 5 parameters with high sensitivity were inverted. The results show that the hydration heat of cement has the greatest influence on the temperature during the pouring process of concrete box girder, and the intelligent algorithm can effectively invert the thermal parameters of concrete box girder. When the number of iterations is increased to a certain extent, the objective function corresponding to SPSO algorithm is smaller than the corresponding objective function of GA, and the convergence process curve of GA is relatively flat, while that of SPSO algorithm has mutation in the early stage.
		2019 Vol. 40 (5): 608-613 [Abstract] ( 1109 ) [HTML 1KB] [ PDF 2234KB] ( 529 )

	614	Effects of recycled aggregates gradation on mechanical performance of concrete and microscopic performance analysis
		LI Qiong, FENG Qiong, CAO Hui
		To investigate the influence of recycled coarse aggregates on the mechanical properties of concretes, various compressive strength tests of the cube at different ages were carried out using the concretes with a single gradation of 5.0 mm to 10.0 mm, 10.0 mm to 20.0 mm, 16.0 mm to 31.5 mm and continuous gradation from 5.0 mm to 31.5 mm and with the replacement rate of 30%，50% and 70%. The effects of aggregate on the mechanical properties of recycled concrete were revealed at microscopic level by scanning electron microscopy(SEM) and Xray diffraction(XRD). The results show that for low dosage, the strength at 112 d is almost the same as that of ordinary concrete when the size of aggregate content ranges from 5.0 mm to 10.0 mm. No matter how many dosages are selected, all the compressive strengthes of different age cubes are low when the aggregate content size ranges from 10.0 mm to 20.0 mm. When the aggregate content size ranged from 16.0 mm to 31.5 mm and 5.0 mm to 31.5 mm, the strength of recycled concrete is increased with an appropriate dosage.
		2019 Vol. 40 (5): 614-620 [Abstract] ( 1228 ) [HTML 1KB] [ PDF 26004KB] ( 426 )

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