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Journal of Jiangsu University(Natural Science Eidtion)

	2014 Vol.35 Issue.5 Published 2014-09-10

	Article

Article

	497	Flame structure analysis of shale gas under different initial conditions
		Liu Shuai, Wang Zhong, Li Mingdi, Zhao Yang, Li Ruina
		Based on the premixed laminar flame velocity model in Chemkin4.5, the initial combustion conditions were regulated to investigate the structure of shale gas laminar flame. For burned shale gas, the effects of initial temperature, initial pressure and nitrogen dilution on shale gas reactants, product and mole fraction of free radicals were discussed to analyze the variation of H+OH mole fraction peak and adiabatic flame temperature. The results indicate that with the increasing of initial temperature, the combustion reaction speed is increased with increased H+OH mole fraction peak, and the premixed laminar burning speed of shale gas increases. The premixed combustion reaction is exacerbated with the increasing of initial pressure, while the mole fraction of free radicals is decreased. Because the increased reaction rate is less than the increased density, the flame propagation speed is declined. When the initial pressure increases, the adiabatic flame temperature is raised due to the diminished pyrolysis reaction. With the increasing of nitrogen dilution, airfuel ratio is increased with declined reactant mole fraction, product and free radical, and the combustion reaction slows down.
		2014 Vol. 35 (5): 497-502 [Abstract] ( 1408 ) [HTML 1KB] [ PDF 2293KB] ( 1128 )

	503	Stability control of vehicle emergency braking after tire blowout
		Chen Qingzhang, He Ren, Li Xuezhi, Xu Guangju
		To realize vehicle stability control after tire blowout, an emergency automatic braking system was developed. After the system received a signal of tire blowout, the automatic braking system worked to decelerate vehicle to a safe speed or to stop before out of control. The breaking system could remedy the delay of driver responding and assist the tire blowout vehicle to stop safely. The fuzzy control strategy of additional yaw torque of the tire blowout vehicle was designed according to the position of target tire. The balanced torque was provided by electrical hydraulic braking(EHB) system, and the antideviating control was carried out according to the dynamic situation of vehicle. The simulating test system was also designed. The testing results show that the vehicle can be quickly stabilized and keep in original track after tire blowout with the proposed emergency braking stability control system.
		2014 Vol. 35 (5): 503-507 [Abstract] ( 1614 ) [HTML 1KB] [ PDF 2939KB] ( 1276 )

	508	Control of regenerative braking force for EV equipped with ultracapacitor
		Chen Liao, Zeng Linghou, Pan Chaofeng, Li Zhongxing
		The regenerative braking is currently used to relieve the biggest obstacle of short driving distance for the industrial application of electric vehicle(EV). In order to meet the braking performance requirement of electric vehicle equipped with ultracapacitor, based on the regenerative braking system working principle, a regenerative braking system model was built by exchange principle. Based on DC/DC converter modeling theory of state space average, an energy recovery control strategy was proposed to realize stable deceleration of vehicle braking, and the braking current of motor was calculated by the ultracapacitor voltage and the speed of motor during EV regenerative braking process. A regenerative braking test bench was built to verify the feasibility of the system structure and the validity of the control strategy. The results show that the braking current is in the vicinity of the target value and relatively stable by the proposed control strategy, and the regenerative braking system has high energy recovery rate. The experimental results of regenerative braking energy recovery and control strategy are consistent with the simulation results, which illuminates that the proposed control strategy can satisfy the requirement of engineering application.
		2014 Vol. 35 (5): 508-512 [Abstract] ( 1793 ) [HTML 1KB] [ PDF 1614KB] ( 1378 )

	513	Numerical simulation of bubbles rising and bursting under buoyancy effect in static water

		In order to investigate the effects of bubble diameters on bubbles rising, bursting and jetting, the twodimension rotating mathematical model was established. The SIMPLEC algorithm was used to simulate a single bubble motion characteristic in static water. The VOF interface geometric reconstruction scheme was adopted to track the bubble surface change and monitor the rising bubble speed change characteristic. The characteristics of bubble in the free surface burst and the jet generate mechanism were discussed. The results show that the rising bubbles gradually become ellipsoid from spherical form during the rising process. When the bubble reaches to water surface, it bursts to generate jet. The rising velocity of bubbles are gradually increased with the increasing of bubble diameters, and the jet is sprayed higher when bubbles burst.
		2014 Vol. 35 (5): 513-517 [Abstract] ( 1473 ) [HTML 1KB] [ PDF 1659KB] ( 2304 )

	518	Dynamic mesh simulation and analysis for inner flow field of cam pump
		Li Yibin1, Li Rennian1, Jia Kun2, Meng Qingwu3, Bi Zhen1
		According to the meshing characteristics of cam pump rotors, the involute profile equation was established to show that when the pressure angle α of profile equation was from 40° to 50°, the conjugate rotors did not produce interference effects during relative motions. To clarify the effects of pressure angle on geometric parameters of cam pump rotor profile equation, based on the dynamic grid model of Fluent software and the grid deformation technique of reconstruction of local grid, the RNG k-ε turbulence model and the PISO algorithm were used to realize dynamic grid numerical analysis of the internal flow field of rotor cavity of the cam pump. Monitoring pulsations of outlet flow and inlet pressure quantitatively, the transient characteristics of flow pulsation and pressure pulsation were achieved under the conditions of different pressure angles and flow. The simulation results show that the outlet flow and the inlet pressure of cam pump present periodic fluctuations. As the pressure angle of cam pump rotors increases gradually, both the outlet flow and the inlet pressure show reduction tendency. The rotational speed is the main impacting factor on the period of fluctuations and the pulsation phenomenon. With the increase of rotational speed, the outlet flow and the inlet pressure increase significantly, and the phenomenon of pulsation is more obvious. When the rotational speed increases to a certain degree, the inlet pressure and the outlet speed increase slightly, and the pulsation phenomenon is more severe.
		2014 Vol. 35 (5): 518-524 [Abstract] ( 1399 ) [HTML 1KB] [ PDF 2298KB] ( 1576 )

	525	Numerical simulation and orthogonal test of baffle in suction chamber of doublesuction pump
		Wang Yang, Lü Zhongbin, Cao Puyu, Liu Jieqiong, Liang Longyi
		To investigate the influence of structural parameters of the baffle in semivolute suction chamber on the performance of doublesuction pump, a doublesuction centrifugal pump for transporting oil was numerically simulated to analyze the flow field with AnsysCFX software. The baffle thickness of S of the semivolute suction chamber, the length of L in horizontal direction and the included angle of θ between exit and horizontal direction were selected as experimental factors. Two levels were selected for every experimental factor to establish orthogonal test scheme of L4（23）. The computation models of doublesuction pump were modified according to the scheme tab. The numerical simulation of test models was carried out under four operating points of 0.6QN，0.8QN，1.0QN and 1.2QN to obtain the optimum assembly of baffle structural parameters. The suction chamber was modified based on the optimum baffle size to compare the optimized pump with the original pump. The results show that the main structural parameter of baffle thickness is the key influence factor on the influent performance of doublesuction pump, and the efficiency of optimized pump is nearly increased by 2% than that of original pump.
		2014 Vol. 35 (5): 525-530 [Abstract] ( 1799 ) [HTML 1KB] [ PDF 1593KB] ( 1254 )

	531	Vision positioning algorithm for chip components based on Harris corner features
		Wang Zujin, Huang Xiaodiao, Gu Pingping
		In order to achieve highprecision positioning for chip components, a detection method was proposed based on Harris corner features to calculate deflection and offset. The component image was preprocessed to improve the quality of lead part, and the connected regions of component leads were marked to judge the lead shapes. The deflection was obtained by Harris corner features extraction, classification and straight line fitting. The component image was rotated and magnified, and two images were matched based on Harris corner features to obtain the offset. The results show that the proposed method can detect the deflection and offset with detection error less than 0.1° and 25 μm, which can meet the positioning accuracy requirement of placement machine vision system.
		2014 Vol. 35 (5): 531-535 [Abstract] ( 1314 ) [HTML 1KB] [ PDF 1653KB] ( 1452 )

	536	Optimization design and simulation of low frequency ultrasonic atomizer drive power based on ARM9
		Gao Jianmin, Zhang Jingyu, Liu Changjian, Li Junyi
		To solve the problems of low efficiency and poor stability of traditional drive power，a novel drive power of low frequency ultrasonic nozzle was developed. The novel drive power was designed with singleended flyback topology circuit. An intelligent drive program of ultrasonic atomization nozzle was developed by embedded visual C++（EVC） program language on Wince5.0 platform and ARM9.0. In the program, frequency and duty of PWM could be adjusted intelligently to ensure the nozzle working near the resonant frequency. Impedance analyzer PV70A was applied to measure equivalent circuit parameters of the nozzle to compute the matching inductance by corresponding mathematical formula. The simulation model of the novel drive power was established by Multisim10.0 .The transformer was featured by ideal transformer model and distribution parameters of leakage inductance and turntoturn capacitance. The optimum parameters of the drive power were obtained by simulation，and the simulation result was verified by actual circuit.
		2014 Vol. 35 (5): 536-542 [Abstract] ( 1635 ) [HTML 1KB] [ PDF 2464KB] ( 1864 )

	543	Implementation and controlling ability based on feature extraction of eventrelated potential
		Zhang Xiliang, Jin Lulu, Zhang Xiarong, Mao Cuiyun
		Stroop interference experiment is often used to investigate implementation and controlling ability. Combining the application of EEG in the cognitive field, EEG signals were induced by Stroop interference experiment. According to the complexity analysis of EEG with sample entropy as test parameter, the complexity changing rules of EEG were observed to establish the method of implementation and controlling ability identification by brain electrical. 35 college students were randomly selected to conduct the digitally Stroop interference test, and the EEG signals were acquired.The EEG complexity analysis results show that the sample entropy reduces firstly， and then rises with final normal level during the test process.For the Stroop interference test, the higher test score is, the smaller sample entropy reduction is. The statistics analysis shows that sample entropy change value and implementation and controlling ability are negatively correlated with significant correlation coefficient of -0.699.The brain electric signal complexity in the Stroop interference test can be used to response implementation and controlling ability.
		2014 Vol. 35 (5): 543-546 [Abstract] ( 1085 ) [HTML 1KB] [ PDF 1621KB] ( 1284 )

	547	Joint cycleidentification method for LoranC signal
		Li Shifeng, Gao Yuanyuan, Hua Yu
		To solve the disadvantages of the current techniques for cycleidentification in LoranC receivers, a new method was proposed with the considerations of carrier tracking information and envelope peak detection. The method was described based on the principle of cycleidentification for peak detection, DLL peak detection method and joint decision pattern. The effectiveness of the DLL peak detection was verified by simulating， and the performance of antiECD and antinoise of the method was analyzed. The identification and tracking performance of the method for standard zerocrossing point was verified by applying the method to the design of LoranC receivers. The test result shows that the method has good performance of antiECD， and the method can identify the cycle accurately when the SIR is greater than 20 dB. The proposed method can completely satisfy the modern LoranC digital receiver design parameters.
		2014 Vol. 35 (5): 547-551 [Abstract] ( 1484 ) [HTML 1KB] [ PDF 1719KB] ( 1068 )

	552	New multiattribute decisionmaking method of designing scheme based on evidential reasoning
		Lu Zhangping, Li Xiaolei, Yuan Hao, Liu Ming
		To overcome the difficulty of obtaining the complete and determined weight value at the conceptual design stage in traditional evidential reasoning approach, a new designing scheme was proposed. Based on the inspiration from preference function in physical programming evaluation method, the triangular fuzzy number was used to determine the fuzzy scale of target property, and an antipreference function was innovatively proposed to determine the weight value. The evaluation grade range was determined based on the divided preferences interval. The knowledges of evidential reasoning evaluation grade, probability distribution function and utility value were adopted to realize the multiattribute decisionmaking(MADM). The example was given to verify the feasibility and the superiority on quantitative description of the uncertain and incomplete subjective evaluation of the new method. The results show that the fuzzy language value can be transformed into confirmed one by the proposed method at the conceptual design stage, and the effective evaluation is realized successfully.
		2014 Vol. 35 (5): 552-557 [Abstract] ( 1165 ) [HTML 1KB] [ PDF 1475KB] ( 1657 )

	558	3D deformable registration algorithm of CT lung images based on point set and mutual information
		Xia Wei, Gao Xin, Wang Lei, Zhou Zhiyong, Zhang Ran
		To solve the disadvantages of timeconsuming and low accuracy in 3D deformable registration algorithm of CT lung images based on mutual information, a new registration method was proposed based on hybrid framework. The mutual information registration was combined with point set registration in the algorithm. Point set registration was performed to obtain the point set displacement vectors, and the transformation function was determined. The resulted transformation function was refined based on mutual information. The registration algorithm for lung regions was performed on 4 sets of 3D CT images, and the registration accuracy was evaluated by landmarks. The results of 3D CT lung images registration show that the hybrid registration algorithm is superior to the mutual information registration method with 70% time reduction and 5% registration accuracy improving on average. The proposed method is fit for 4D CT lung images rapid registration.
		2014 Vol. 35 (5): 558-563 [Abstract] ( 1453 ) [HTML 1KB] [ PDF 2312KB] ( 1605 )

	564	Simulation method of firefighting and rescue operation based on multiAgent joint
		Liu Jing, Cheng Hua
		To realize cooperation of commands in joint firefighting and rescue, the multiAgent joint firefighting and rescue operation framework was built. The description of command Agent, operation Agent and environment Agent in the system was given. The definition of interaction rules between Agents and environment was proposed to describe the interrelation of system. Simulation model of joint firefighting and rescue was set up. The JAVA language was adopted to programme on Swarm, and the functions of proposed model and relevant mechanism were validated. The results show that the information exchange between joint firefighting and rescue commands is realized with rapid, efficient and scientific decision on emergency. The proposed model can improve the operational quality of fire forces.
		2014 Vol. 35 (5): 564-570 [Abstract] ( 1303 ) [HTML 1KB] [ PDF 1547KB] ( 1450 )

	571	Model integration based on universal relation model representation
		Xing Ying, Zhang Hongjun, Zhang Rui, Shan Lili, Deng Xiaoyong
		To solve the problem that existing model representation could not meet the requirements of dealing with model, data and solver in model integration and model reuse for facing new decision problem, a new model integration method was proposed based on universal relation model representation. Based on the limitation analysis of different model representation in model integration, a new model representation definition was provided based on universal relation. In order to realize the consistency between model and user data, the object was taken as data medium between universal relation data model and user data, and the transition algorithm was built. Based on the new universal relation model representation, a series of algorithms of model tree generation algorithm, model tree optimization algorithm and model tree verification algorithm were put forward in model integration to solve new decision problem. The results show that the proposed model integration can meet the independent management requirements of dealing with model, data and solver in model base, and the model optimized integration and the effectiveness verification are achieved at the same time. The quality and automation of model reuse and the flexibility of model integration in decision support system (DSS) are improved for facing new decision problem.
		2014 Vol. 35 (5): 571-577 [Abstract] ( 1267 ) [HTML 1KB] [ PDF 1613KB] ( 1119 )

	578	Comparison of hybrid energy sources with different structures in hybrid electric vehicles

		To solve the problems of short cycle life and small power density of single battery energy storage system in hybrid electric vehicles, the batteryultracapacitor hybrid energy source was introduced to bring into full play of the characteristics of high energy density of battery and high power density of ultracapacitor. The passive, the improved passive and the active hybrid energy sources were investigated and simulated with MATLAB 7. The simulation results show that the power capacity of the hybrid energy source is enhanced greatly, and the discharging process of battery is optimized. The active hybrid energy source has the better performance than those of the passive and the improved passive hybrid energy sources.
		2014 Vol. 35 (5): 578-582 [Abstract] ( 1325 ) [HTML 1KB] [ PDF 2058KB] ( 1190 )

	583	Experiment of pressure deformation behavior for hollow block masonry of recycled aggregates concrete
		Guo Zhanggen, Sun Weimin, Li Minsu, Liu Jialiang
		In order to investigate the pressure deformation behavior of the recycled concrete block masonry, the small hollow block of recycled aggregates concrete was prepared with average compression strength of 8.60 MPa. The replacement rate of recycled concrete aggregate was 75%. The compression behavior and the elastic modulus of small hollow block masonry with recycled aggregates concrete were investigated to discuss the failure process and the failure feature of recycled concrete hollow block walls. The stressstrain curve and the elastic modulus were also analyzed. The test results show that the compressive properties and the deformation process of recycled concrete hollow block wall are similar to those of ordinary concrete hollow block masonry. The compression limit state reaches after the forming and penetrating of main vertical crack in the specimen. The ultimate bearing capacity and the elastic modulus increase with the increasing of mortar strength. According to the regression analysis of test results, the axiscompression strength and the elastic modulus of recycled concrete hollow block masonry can be calculated by the formula in the standard of masonry structure design code(GB 50003—2010). Based on the test results, the two proposed stressstrain constitutive models are well consistent with experimental results.
		Guide:null
		2014 Vol. 35 (5): 583-588 [Abstract] ( 1278 ) [HTML 1KB] [ PDF 1715KB] ( 1575 )

	589	Effects of winding way on mechanical properties of GFRP bar
		Pang Yuyang, Zhang Pu, Gao Danying, Zhao Ke, Mo Fei
		To investigate the influence of winding ways, several kinds of glass fiber reinforced plastic(GFRP) bar with different winding ways were prepared with bar diameters of 6,8,10,12,14 and 16 mm and rib spacing of 10,20 and 30 mm. The entanglements were nylon rope, a layer of glass fiber bundles and two layers of glass fiber bundles. The tensile, compression and shear experiments were conducted. Based on the test phenomenon and database, the influence and the mechanism of winding ways were discussed. The results illustrate that the winding way has marked influence on tensile property for small rib spacing. When the diameter is small, the shear and compressive properties of GFRP bars with glass fiber bundles on surface are improved obviously.
		2014 Vol. 35 (5): 589-594 [Abstract] ( 1492 ) [HTML 1KB] [ PDF 1720KB] ( 1176 )

	595	Dynamic characteristics and seismic response analysis of cablestayed suspension bridge with CFRP cables
		Liu Ronggui, Chen Bei, Feng Guoying, Cai Dongsheng
		Through finite element method, the dynamic characteristics and the seismic response analysis of an 800 mspan cablestayed suspension bridge with CFRP cables were conducted to compare with those of the bridge in the same structural arrangement with steel cables. The results show that the vibration frequencies of span cablestayed suspension bridge range from 0.1 to 0.7 Hz, and the vibration mode is significantly threedimensional and mutually coupled. The natural frequencies of the cablestayed suspension bridge with CFRP cables are larger than those of the bridge with steel cables, which means that CFRP cables can help resisting low frequency excitation. By the seismic waves, the displacement of cablestayed suspension bridge with CFRP cables is similar to that of bridge with steel cables, while the internal force of bridge with CFRP cables is smaller than that of bridge with steel cables. The CFRPcable bridge has certain advantages in the decay of response.
		2014 Vol. 35 (5): 595-599 [Abstract] ( 1308 ) [HTML 1KB] [ PDF 2242KB] ( 1154 )

	600	Improving mechanism of expansive soil by weathered sand and slope stability analysis
		Yang Jun, Li Xinchun, Zhang Guodong, Tang Yunwei, Liang Yong
		The improving mechanism of expansive soil by weathered sand was investigated through the indoor experiment. The physical and chemical reactions between weathered sand and expansive soil were revealed to discuss the relationship between weathered sand content and swelling shrinkage characteristics of expansive soil. Based on laboratory experiments, for the firstclass highway rebuilding engineering construction project from Yichang Xiaoxita to Yaqueling, the overall stability analysis of embankment with 10 m height was conducted by strip method. The results show that the safety coefficient of embankment with natural expansive soil is small, which can not meet the specification requirements. Compared with the embankment with undisturbed expansive soil, the slope stability coefficient of embankment with weathered sand improving expansive soil was significantly improved, which can meet the code requirements. With the increasing of sand mixing ratio, the safety coefficient of subgrade is increased first with later decrease. When the sand ratio reaches 20%, the maximum safety coefficient of improved expansive soil filling roadbed is achieved.
		2014 Vol. 35 (5): 600-604 [Abstract] ( 1416 ) [HTML 1KB] [ PDF 1736KB] ( 1112 )

	605	Comfort evaluation and dynamic performance of suspension footbridge
		Cao Yugui, Hu Jun, Li Xiaoqing, Zhuang Jinsong, Feng Wanli
		Using block Lanczos method, the vibration characteristic of suspension footbridge was analyzed by finite element program of ANSYS. According to the standard of bases for design of structuresserviceability of buildings and walkways against vibrations (ISO 10137), the pedestrian load was simulated. The lateral and vertical bridge accelerations caused by single person and crowd loads were analyzed, respectively. The comfort of pedestrian bridge was analyzed by comprehensive comfort evaluation method. The results show that the comfort performance of suspension footbridge structure meets the requirements. Compared with common suspension bridge, the new suspension footbridge with upper main cables, lower bridge deck cables and suspenders not only meets the requirements of comfort and serviceability, but also reduces the mass and the economic costs.
		2014 Vol. 35 (5): 605-610 [Abstract] ( 1811 ) [HTML 1KB] [ PDF 1485KB] ( 1615 )

	611	Oscillated behavior and Lyapunov exponent calculation of nonlinear switching system
		Yu Yue, Zhang Chun, Bi Qinsheng
		The complicated behaviors of the model in 3D nonlinear switching system were investigated in details. Based on the local analysis, the critical conditions of Fold bifurcation and Hopf bifurcation were derived to explore the bifurcations of compound systems with different stable solutions of focus or stable cycle in the two subsystems. With the change of parameters, different types of nonsmooth bifurcations occurred in the switching system to result in chaotic oscillations. By Poincar mapping, the Lyapunov exponent of the switching system was calculated. Compared with bifurcation diagram, the effectiveness of the algorithm was verified. The results show that with Lyapunov index as criterion, the route to chaos via perioddoubling bifurcations in such compound system is revealed explicitly.
		2014 Vol. 35 (5): 611-615 [Abstract] ( 1636 ) [HTML 1KB] [ PDF 4088KB] ( 1143 )

	616	Analysis of queuing system with multiple working vacation
		Yuan Chunhui, Xu Jian, Zhu Yijun
		The working vacation queuing system with negative customers and vacation interruption was considered. The server works with low service rate rather than completely stops during vacation period, and this kind of incomplete vacation strategy is called working vacation. Because the real life queuing model might meet many interference factors, a negative customers queuing model was proposed. In the system, customers are either positive or negative. Negative customers remove positive customers one by one only at the end of line if there is positive customer. When a negative customer arrives, if there is no positive customer in system, the negative customer will disappear. Negative customers do not accept service. Another vacation policy of vacation interruption was introduced. By quasi birth and death process and matrixgeometric solution method, the stationary queue length was obtained. The stochastic decomposition of queue length in stationary state was proved to achieve the distributions for additional queue length. According to numerical examples, the proposed model can represent some practical problems reasonably.
		2014 Vol. 35 (5): 616-620 [Abstract] ( 1069 ) [HTML 1KB] [ PDF 1361KB] ( 1142 )

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