Volume 33,Issue 3,2010 Table of Contents

1 Optimal control strategy of CVT equipped vehicle for maximum power performance

LUO Yong , SUN Dongye , HU Fengbin , DENG Tao

2010, 33(3):1-6. DOI: 10.11835/j.issn.1000-582X.2010.03.001

[Abstract](2486) [HTML](0) [PDF 7.00 M](1489)

Abstract:
Continuously Variable Transmission （CVT） equipped vehicle improves its power performance by ensure the engine works on its peak power point under each throttle angle. This method didn’t pay any attention to the CVT efficiency, which also has influences on power performance of the system. Based on the analysis of how CVT efficiency influences power performance of the system, an optimal algorithm is proposed to calculate the target CVT ratio to achieve maximum power performance with consideration of CVT efficiency. A simulation model is established to validate the optimal algorithm. Simulation results indicate that the acceleration time from 0 km to 100 km of the system veduced by 0.63 s.

2 Analysis on new gyratory fixedspindle cycloid drive

ZHU Caichao , LUO Zhaoxi , LIU Mingyong , XIAO Ning

2010, 33(3):7-12. DOI: 10.11835/j.issn.1000-582X.2010.03.002

[Abstract](2154) [HTML](0) [PDF 6.37 M](1667)

Abstract:
The current cycloid reducer drive has the shortage of needing special output mechanism, large volume and high vibration. To solve this problem, a new gyratory fixedspindle cycloid drive is designed. The drive principle of the reducer is introduced. Formula for calculating the basic parameters and tooth profile equation of cycloid gear are derived. On the basis of discussion of the mechanism and the principles of gear connection, a prototype is designed and manufactured. The results of the prototype test on the gear test rig indicate that the transmission efficiency of the new drive may reach 91.9% at rated operating conditions, the biggest vibration velocity effective value is 3.09 mm/s, and the biggest structure noise is 101.6 dB.

3 Analysis of oil pressure distribution influenced by channel flow structure of wet friction clutch

LIN Tengjiao , ZHANG Shijun , LV Hesheng

2010, 33(3):13-18. DOI: 10.11835/j.issn.1000-582X.2010.03.003

[Abstract](2076) [HTML](0) [PDF 8.55 M](1484)

Abstract:
When multidisk clutch is in disengaged operation, friction plates and mating plates may not separate absolutely. To avoid the slipping friction caused by this and reduce the clutch’s overheating, the lubricant pressure between the plates should be welldistributed in design. With the use of ANSYS/FLOTRAN software, 3D finite element models of six different channel flow structures are established. Using finite element method and the fluid dynamic theory, the flow field is analyzed, and then the law of the influence of different channel flow structures on oil pressure distribution between the plates is summarized. The result of the study shows that the four squirt holes at right side with perforated structure are better than those without, and squirt holes with the cone or stepped shape are better than those with column shape, which means that with the two improvements of the channel flow structure, the lubricant pressure distribution can be uniformed.

4 Experimental analysis on borehole hydraulic lift equipment

PEI Jianghong , LIAO Zhenfang , TANG Chuanlin

2010, 33(3):19-23. DOI: 10.11835/j.issn.1000-582X.2010.03.004

[Abstract](2343) [HTML](0) [PDF 4.28 M](1457)

Abstract:
Using quartz sands to simulate the work condition, the experiment on the factors of sand lift which influences the lift effect in borehole hydraulic equipment is carried out. The experiment results show that there is an optimum distance between the intake and mineral deposit; under the condition of the same air input capacity; the lifting capacity increases with the submergence proportion; different installation angle of the water nozzle influences the effect of the sand lift; there is an optimally installation angle of 10 degrees between nozzle axial lead and tangential direction of the lift pipe wall; the number of air nozzles affect lifting capacity; the optimally installation nozzles number is 3; and whether fitting stir nozzles or not is the key factor which determines lifting success.

5 Analysis of elastohydrodynamic lubrication of steel planar wormgear drive

QIU Xinyang , ZHANG Guanghui , QIN Datong

2010, 33(3):24-29. DOI: 10.11835/j.issn.1000-582X.2010.03.005

[Abstract](2240) [HTML](0) [PDF 5.65 M](1207)

Abstract:
Based on study of elastohydrodynamic lubrication (EHD) and meshing theory of planar worm gear drive, EHD model for the drive is proposed. Minimum film thickness on the whole contact area is calculated. EHD status for the drive is analyzed. The distributions of film thickness show that, EHD status during entry engagement is better than that during exit engagement, and EHD status of worm addendum area is better than that of dedendum area. Influencing factors such as work conditions and optimized parameters along with their effects were analyzed. Theoretical analysis suggests that the optimizing pressure angle and increasing worm pitch diameter have influence on improving lubricant performance of the planar worm gear drive.

6 Dynamic optimization design of gear transmission system for wind turbine

ZHANG Qingwei , ZHANG Bo , WANG Jianhong , QIN Datong

2010, 33(3):30-35. DOI: 10.11835/j.issn.1000-582X.2010.03.006

[Abstract](2465) [HTML](0) [PDF 4.73 M](2253)

Abstract:
The differential equation which governs the behavior of the gear transmission system of 1.5 MW windturbine is established. The external excitation caused by wind speed fluctuation is discussed and the internal excitation due to timevarying mesh stiffness and comprehensive error is also analyzed. The calculating formulations of the harmonic balance method of nonlinear dynamic equations are presented. Then, the multiobjective dynamic optimization model is developed to minimize the value of vibration acceleration and the overall volume. The optimization of a practical example using mixeddiscrete combined programming is performed. The result shows that the proposed method of modeling and optimization design can effectively reduce the wind turbines gearbox vibration levels and weight.

7 Numerical simulation and experimental analysis for process parameters of cold straightener

TANG Qian , DU Xuesong , GAO Zhan , Xu Jie , ZHANG Yuanxun

2010, 33(3):36-40. DOI: 10.11835/j.issn.1000-582X.2010.03.007

[Abstract](3145) [HTML](0) [PDF 4.66 M](1702)

Abstract:
This paper focuses on the design of eleven rollers straightener. An elasticplastic FEM model is introduced to cope with the difficulty of preestimating the performance of straightening during the design process. To obtain straightening force, stress, strain, elasticplastic ratio, relations between reduction amount of roller and roughness of plate per square meter, a threedimensional element model is established and straightening process is simulated. In addition, an experiment is conducted to measure the reduction amount of roller and the roughness of plate per square meter. It is shown that the results of numerical simulation are consistent with the experimental results. The developed computing model can provide essential references for the optimization of straightener.

8 Supplier management model in collaborative product development

LI Hao , GUO Gang , XU Jianping , SHEN Lei , YANG Juan

2010, 33(3):41-48. DOI: 10.11835/j.issn.1000-582X.2010.03.008

[Abstract](1986) [HTML](0) [PDF 7.56 M](1428)

Abstract:
Abstract:To manage suppliers who are involved in product collaborative design and innovation, on the basis of collating and analyzing 35 literatures related to codesign process and supplier management activities, a threetier model of supplier management in collaborative product development is put forward, which includes tiers of longterm strategic management, product development project and codesign task. In terms of collaborative product development process, an overall management activities model about suppliers is built. Methods of supplier selection and performance evaluation are studied. A case study related to supplier management in equipment codesign from a steel company is provided to verify the theory and methods.

9 Optimal allocation model and its genetic algorithms of outsourcingproduction resources in multitask

YIN Sheng , YIN Chao , LIU Fei , SHEN Chao

2010, 33(3):49-55. DOI: 10.11835/j.issn.1000-582X.2010.03.009

[Abstract](2710) [HTML](0) [PDF 7.94 M](1501)

Abstract:
According to the characteristics of the outsourcing production such as multitask, dynamic environment, and multiobjectives etc, an optimal allocation model of outsourcing in multitask is established by the linear weighted method. Outsourcing production time, outsourcing production cost and outsourcing production quality are set as its target functions. Then, genetic algorithm for solving this model is also investigated. Finally, a case study is employed for the effectiveness and the validity.

10 Intelligent simulation of complex production systems including expert decision

ZHANG Xiaodong , DUAN Shuang yue , GUO Shuanyin , YU Tian

2010, 33(3):56-59. DOI: 10.11835/j.issn.1000-582X.2010.03.010

[Abstract](1496) [HTML](0) [PDF 4.14 M](1156)

Abstract:
Expert’s decision process plays an important role in production systems. To simulate complex production system including expert decision, an intelligent simulation strategy of complex production system based on interactive simulation and knowledge mining is proposed. The simulation principles and methodology are described. Key technologies of expert decision process simulation are studied in detail from the aspects of simulating algorithm and software programming. The simulation strategy is used and verified in a universal rail production line. Simulation results indicate that the intelligent simulation model can effectively describe complex production system including expert decision. It provides a new method for humanmachine cooperation and human decisionmaking process study in production systems.

11 Ultrasound imaging method based on segmentdynamic apodization technology

CHEN Minyou , WANG Weiming

2010, 33(3):60-64. DOI: 10.11835/j.issn.1000-582X.2010.03.011

[Abstract](2247) [HTML](0) [PDF 4.73 M](2181)

Abstract:
Abstract:In the ultrasound imaging system, the main shortage of apodization technology is that, there is a better image resolution only in a limited region, out of the region, the resolution is significantly lower. The segment dynamic apodization can make up the shortcoming. After analyzing kinds of the 3dB isograms of the apodization function, the limited region with the best image resolution has been obtained. By way of subleading into the relevant apodization function, the segment dynamic apodization technology is implemented and used to plot the 3dB isogram and simulate the image. Simulation results show that the proposed method of segment dynamic apodization technology, can improve the image quality effectively.

12 Affine invariant shape recognition with particle swarmoptimization algorithm

MAO Yuxing , HAN Beitao , FENG Lian , WANG Hao , XU Shaozhi , HAO Yuanyang

2010, 33(3):65-71. DOI: 10.11835/j.issn.1000-582X.2010.03.012

[Abstract](2208) [HTML](0) [PDF 6.51 M](1474)

Abstract:
Focusing on the problem that affine transformation will exist among the contour images due to variation of the viewpoints, a new approach to extract affine invariant features and matching strategy is proposed for shape recognition. First, the centroid distance and azimuth angle of each boundary point are computed. Then, with a priordefined angle interval, all the points in the neighbor region of the sample point are considered to calculate the average distance for eliminating noise. After that, the centroid distance ratios(CDRs) of any two contour points with angle difference of 180° are achieved as the representation of the shape, which would be invariant to affine transformation. Since the angles of contour points changed nonlinearly among affine related images, the CDRs should be resampled to build corresponding relationship. It could be regarded as an optimization problem of path planning. In our method, a PSObased path planning model is presented to address this problem. The experimental results demonstrate the efficiency of the proposed method in shape recognition with translation, scaling, rotation, distortion and noise interference.

13 Regularity of the saturation lines’ change and stability analysis oftailings dam in the condition of flood

YIN Guang zhi , LI Yuan , WEI Zuoan , JING Xiaofei , ZHANG Qiangui

2010, 33(3):72-75. DOI: 10.11835/j.issn.1000-582X.2010.03.013

[Abstract](2990) [HTML](0) [PDF 4.84 M](1970)

Abstract:
Yangtianqing tailings dam is a new dam planned for a copper mine. At the design period, test in laboratory is carried out to simulate the process of dam pile based on the design information of Yangtianqing tailings dam. And the regularity of the saturation lines’ change at the condition of flood and normal is studied, when the dam have been heaped to the about 2/3 of the total height (120 m). Based on the test data, the stability coefficients of the dam at this height in different conditions are obtained with the Slide software, and they could be served for the following test and the mine’s future safety production. It is shown that the dam is safe in the normal condition, while in the condition of flood, the stability coefficient is less than the benchmark in national standard. Thus, it is necessary to rectify the preliminary design or to take other measures to ensure the safety of the tailings dam.

14 Numerical simulation on galloping of iced donductors

HU Jing , YAN Bo , ZHANG Hong yan , ZHOU Song

2010, 33(3):76-81. DOI: 10.11835/j.issn.1000-582X.2010.03.014

[Abstract](2885) [HTML](0) [PDF 5.99 M](6242)

Abstract:
To investigate galloping of iced conductors, with the release of the bending degreeoffreedom of Euler beam element and setting the material to be ‘No Compression’ in ABAQUS software, a cable element with torsion degreeoffreedom is obtained. And then the aerodynamic loads including drag, lift and torque on the iced conductor are simulated by means of the userdefined element. The galloping of iced single conductor and iced twin bundle conductor are numerically analyzed to demonstrate the efficiency of the proposed method. The effects of initial attack angle，span length and initial tension in conductor on the behavior of galloping are investigated by numerical simulation.

15 Simulation of coal and gas outburst with different gas pressure

WANG Weizhong , TAO Yunqi , XU Jiang , PENG Shoujian

2010, 33(3):82-86. DOI: 10.11835/j.issn.1000-582X.2010.03.015

[Abstract](2835) [HTML](0) [PDF 5.01 M](1680)

Abstract:
To discuss the mechanism of gas pressure in coal and gas outburst process，with the constant of moulding pressure，moisture and forced status of the outburst coal sample, five outburst experiments of the different gas pressure are simulated by the independently developed coal and gas outburst simulation test device and the same coal sample. It is found that coal and gas outburst could produce pyriform or elliptic holes with small mouth and big belly. And the volume of hole to the volume of outburst coal is from 1/2 to 2/3. Moreover, there is a threshold value of gas pressure for coal and gas outburst and greater with the increase of outburst intensity. As the force of outburst, the gas pressure has a certain effect of ejection and porphyrization on the outburst coal powders. The coal sample temperature varies continuously with the trend of rising firstly and decreasing subsequently. And the grads of coal temperature can be adopted for predicting the coal and gas outburst.

16 Numerical analysis on fanshaped airblast atomizer parameters

FU Xiangzhao , JIANG Bin , WANG Yong , WANG Ziyun

2010, 33(3):87-91. DOI: 10.11835/j.issn.1000-582X.2010.03.016

[Abstract](2506) [HTML](0) [PDF 4.72 M](1791)

Abstract:
Based on EulerianLagrangian coupling algorithm, the performance parameters of Fanshaped airblast atomizer is simulated. It is shown that when gasliquid mass flow ratio is constant, the spray angle and velocity of droplet decreases and SMD increases gradually with the increase of orifice width. Therefore, in order to obtain much smaller liquid droplet, orifice width should not be too wide. When the orifice width is constant, along with the increase of gasliquid mass flow ratio, SMD decreases firstly and increases later when reaching the minimum. And SMD minimum value is 39.5 μm when the orifice width is 0.6 mm.

17 Effects of simulated acid rain on the release of Al3+ in typical soils from Three Gorges Reservoir region

LIU Li , ZHOU Zhiming , LIN Yong , LU Yiyu

2010, 33(3):92-98. DOI: 10.11835/j.issn.1000-582X.2010.03.017

[Abstract](1995) [HTML](0) [PDF 5.79 M](1306)

Abstract:
The releasing pattern of Al3+ in different horizons in four types of typical soils, which samples were collected from the Three Gorges Reservoir Region, is studied by simulated acid rain leaching of soil columns equipment indoor. The results indicate that the buffering capacity of the tested soils against acid rain is weakened after a long time of leaching, and acid rain of a lower pH presents a stronger impact on the acidification of the soil. The leaching amount of Al3+ in four types of typical soils increases with the decline of acid rain pH value. The leaching quantities are low while the pH value is equal or greater than 3.50 levels, but increase remarkably while the pH is 2.50. Meantime, leaching of simulated acid rain changes the concentration of exchangeable Al3+ in soil (except for redbrown purplish soil). These changes are more remarkable in soils with the pH decrease of simulated acid rain.

18 A digesting measurement method of municipal sewage sludge’s TN and TP

CHEN Dayong , WANG Liao , LUO Shuluan , MA Peidong , TAO Yu

2010, 33(3):99-102. DOI: 10.11835/j.issn.1000-582X.2010.03.018

[Abstract](1964) [HTML](0) [PDF 3.81 M](2080)

Abstract:
Parametric study with orthogonal experiment is carried out for digestion of municipal sewage sludge with H2O2 and H2SO4. For TN, the adding time of H2O2 is significant at 0.1 level, whilst the dosages of H2O2 and H2SO4 are less significant. The better digestion scheme is that the number of adding time of H2O2 is three and the dosages of H2O2 and H2SO4 are 0.25 mL and 1 mL, respectively. And for TP, the adding time of H2O2 is significant at 0.01 level, and the dosage of H2O2 is significant at 0.05 level. However, the dosage of H2SO4 is less significant. Thus, the better digestion scheme is that the adding time of H2O2is three and the dosages of H2O2 and H2SO4 are 0.25 and 5mL, respectively. Combining the two schemes, the optimal scheme of sludge digestion is three times for H2O2 adding and 0.25 and 5mL for the dosages of H2O2 and H2SO4, respectively. With the test, the recovery rate of TN is between 98.53% and 101.80%, while the recovery rate of TP is between 97.07% and 101.67%.

19 Fuzzy decision for wastewater treatment process selectionbased on graytheory and its application

XIAO Tieyan , LIN Changchun , LUO Guyuan , JI Fangying

2010, 33(3):103-107. DOI: 10.11835/j.issn.1000-582X.2010.03.019

[Abstract](2130) [HTML](0) [PDF 3.81 M](1270)

Abstract:
Decisionmaking of sewage treatment process directly affects the accuracy and efficiency of the process selection. An optimized fuzzy decision method is proposed based on fuzzy decision and contrast weighting method. Moreover, a webbased decisionmaking support system for the selection of sewage treatment process is developed with the Apache+PHP+MySQL development environment. The system had realized the online decisionmaking for sewage treatment process, and enhanced accuracy and reduced the decisionmaking time.

20 Optimal model on integrated production planning andscheduling of steelmaking and continuous casting process

ZHENG Zhong , LIU Haiyu , GAO Xiaoqiang , HE Lamei , ZHANG Tao , CHEN Kai

2010, 33(3):108-113. DOI: 10.11835/j.issn.1000-582X.2010.03.020

[Abstract](2808) [HTML](0) [PDF 5.98 M](1543)

Abstract:
Considering the uncertainty and complexity of production planning and scheduling in steelmaking and continuous casting, an optimal simulation model is built. Based on the analysis of the logistics in steelmaking process, the casting plan is regarded as the global goal, and the procedural information is taken into account, as well as the local evolution rule that abstracted from scheduling rule. To simulate transferring of materials in the process, the state of operation sites are updated as a result of the global goals, process information and local rule. The goaldirected simulation is carried out based on the selforganization evolution mechanism. Finally, an optimal integrated production plan is made by a continuous simulation evolution. A simulation case for eight hours production plan shows that the model is valid and efficient.

21 Experiment study of adding VTi pellet in burden structure of blast furnace

DU Yungui , HE Yuanyuan , ZHENG Huimin , LIU Qingcai , CHEN Qianxiang , AO Wanzhong

2010, 33(3):114-118. DOI: 10.11835/j.issn.1000-582X.2010.03.021

[Abstract](2358) [HTML](0) [PDF 4.00 M](1482)

Abstract:
In allusion to the existing material conditions of blast furnace in Shuicheng I﹠S Corporation, rationality of sinter with VTi pellets is studied through metallurgical performance tests of single ore. Regularity for change of reducibility, reduction degradation index, melting and dropping index changes of burden structure are researched, at increased VTi pellets in the same proportion of sinters and different proportion of imported lump ores. The results show that sinter RI reaches 90.68%, integrated charge RDI and soft melting index are improved by adding vanadiumtitanium pellets. The charge structure is the best when VTi pellets ratio at 20%, which softening starting temperature is 1 147 ℃, softening range is 156℃, dripping temperature at is 1 349 ℃, maximum pressure is 2 223 Pa and has a good permeability.

22 A comparative study of eutrophication evaluationmodels based on SOM neural network and SVM

SHI Xin , XIONG Qingyu , LEI Luning

2010, 33(3):119-123. DOI: 10.11835/j.issn.1000-582X.2010.03.022

[Abstract](2489) [HTML](0) [PDF 3.82 M](1432)

Abstract:
Abstract:Considering the eutrophication evaluation problems of complicated water environment, using the eutrophication inspection data of the Three Gorges Reservoir district to compare of the eutrophication evaluation models’ performances based SOM neural network and SVM. The results shows that both models have fast calculation speed and high precision，but compared to SOM neural network model, the SVM model has better stability and antijamming capability, also its preferences are simpler.

23 Intelligent control of the grinding and classificationsystem based on fuzzy RBF neural network

WANG Yunfeng , LI Zhanming , YUAN Zhanting , WAN Weihan

2010, 33(3):124-128. DOI: 10.11835/j.issn.1000-582X.2010.03.023

[Abstract](1498) [HTML](0) [PDF 4.23 M](1177)

Abstract:
Based on RBF neural network and fuzzy theory, an intelligent control method, which can effectively overcome disturbance resulting from grinding efficiency and cyclone’s inlet pressure, is proposed. This method that can make grinding concentration and overflow particle size wellproportioned will allow us to improve flotation grade and increase yield, and therefore realize the optimization of grinding and classification process. The present method is of simple analysis, less time of network learning and training. And high learning precision is high. The simulations show that our approach can also be applied to the control systems that are difficult to build accurate math model.

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