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Transverse Joint Aperture simulation of High Arch Dam Based on Measured Temperature in Construction Period

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Wuhan University Journal of Natural Sciences 2014年第4期19卷 361-368页

作者： ZHANG Chao CHANG Xiaolin LIU Xinghong DUAN Yin State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University School of Civil and Architectural Engineering Wuhan University Changjiang Survey Planning Design & Research Co. Ltd

Transverse joint aperture is of certain reference value to ensure joint grouting quality and overall safety of high arch dam. A 3D isoparametric joint element model with spherical surface key grooves and finite thickness is used to simulate a transverse joint. A set of program is developed to simulate the transverse joint ap- erture of Dagangshan high arch dam. Combined with the measured temperatures, the whole developing process of Dagangshan arch dam＇s transverse joint aperture is simulated. The real work behav- ior of transverse joint, thermal and mechanical properties of con- crete, pouring process, joint grouting temperature and cantilever height of high arch dam are considered during the simulation. The simulation results show that the lower of the joint grouting tem- perature, the larger value of transverse joint aperture; the higher of cantilever height during the construction period, the smaller value of transverse joint aperture.

关键词： high arch dam simulation analysis transverse jointaperture temperature field cantilever height

Study on instability fracture and simulation of surrounding rock induced by fault activation under mining influence

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Rock Mechanics Bulletin 2023年第2期2卷 32-40页

作者： Jie Chen Kaiwen Shi Yuanyuan Pu Derek B.Apel Chuanjiu Zhang Yujun Zuo Jiongkun Chen Le Xu Zhen Gui Longfei Song School of Resources and Safety Engineering Chongqing UniversityChongqing400044China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China School of Mining and Petroleum Engineering University of AlbertaEdmontonAlbertaT6G 2R3Canada Guoneng Shendong Coal Group Co. LtdChina Mining College Guizhou UniversityGuiyang550025China

The fault is potentially vulnerability's geological structure in the working face and its vicinity,and it is also a crucial geological factor affecting coal mine safety *** investigate the unstable failure of surrounding rock induced by fault activation under the influence of adoption,which was studied utilizing field case and numerical analysis for the deformation and failure process of surrounding rock near the fault-affected *** with field cases,this paper analyzes disturbance stress and roof abscission layer monitoring in effecting zones of fault *** the discrete element 3DEC numerical analysis method,the model of surrounding rock unstable fracture induced by fault activation under adoption is *** unstable fracture and stress variation characteristics of surrounding rock induced by fault activation during the excavation of the upper side wall and lower side wall of the faults are simulated and *** analysis shows that as the coal working face continues to advance,the mining stress gradually *** is a zigzag wave on the relationship curve between coal mining and roof displacement near the fault,which reveals that the surrounding rock of the fault activation affected zone is in the superposition state of static load and dynamic ***,the simulation results show that the stress and displacement of surrounding rock near the fault increase with the advance of coal mining *** closer to the fault plane,the displacement gradually returns to zero,and the stress is also in a lower state.

关键词： Surrounding rock mining Fault activation Instability fracture simulation analysis

Structural Design and Static Stress analysis of Dead Pig Vehicle

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维普期刊数据库

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International Journal of Plant Engineering and Management 2017年第2期22卷 102-113页

作者： ZHANG Tie-min LI Wen-tao LIANG Li National Pig Seed Industry Engineering and Technological Research Center South China Agricultural University

Nowadays,in our pig field there has no special device to transport those dead pigs. In normal condition,we need some person to carry out those dead pigs from the pig *** considering the narrow aisle,manual handling is not convenient,on one hand,these measures will increase the labor costs,on the other hand,these measures will increase the labor intensity of workers. In order to carry out those dead pigs from the pig field fast and efficient,to achieve the purpose of health cultivation,in this paper,we designed a dead pig vehicle to handle those dead pigs. The dead pig vehicle consists of chassis,lifting device,driving device,rotating device,power system and control system. The vehicle adopts self-propelled structure,which is equipped with two lead-acid batteries as power. Loading,transportation,unloading and other dead pig handling full operations can finished by only one person. The result of simulation shows that the dead pig vehicle has a good performance and a good stability,it also can satisfy the requirements of the narrow aisle. The results of this research can provide reference for the similar transportation vehicles.

关键词： vehicle structural design pig field simulation analysis livestock

Body Structure Design, simulation and Parameter Optimization of a Crawler Type Mobile Flat Bedplate Frame Composite Car

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Computer Aided Drafting,Design and Manufacturing 2013年第4期23卷 53-57页

作者： LUO Qing-sheng HOU Yuan ZHANG Ze-zheng ZHAO Hai-bo Beijing Institute of Mechanical and Electrical Engineering

The report mainly studied the crawler frame motion platform to reduce weight and increase the intensity. Report described the structural design process which using CAD/CAE technology for solid modeling, simulation analysis, parameter optimization. And it also explained the outstanding advantages of CAD/CAE technology in mechanical design as well as simulation analysis.

关键词： crawler robot flame solid modeling simulation analysis parameter optimization CAD/CAE technology

Path Following Method Based on Constrained Arc Fitting and Curvature Feed Forward Control

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Path Following Method Based on Constrained Arc Fitting and C...

2020中国汽车工程学会年会暨展览会

作者： Jiang Hongwei Zhang Jian Wang Yu Xie Fei Zhang Sutie Han Yaning Wang Shan China FAW Group Co.Ltd Intelligent Connected Vehicle Development Institute

Path following is an important part of intelligent driving,belonging to vehicle lateral *** is one of the research focuses to follow the desired path steadily and *** order to realize the path following analysis and verification of the intelligent vehicle,a two degrees of freedom vehicle lateral dynamic model was *** on that,a curvature feedforward control model which can accurately describe the mapping relationship between the steering angle and the path curvature was proposed and ***,In order to obtain accurate curvature information,based on the least squares theory,a constrained arc fitting method was proposed to calculate the path *** with curvature feedfoward control model,the path following control model of intelligent vehicle was ***,the following effect of the path following method and the existing multi-point preview following method was compared by simulation ***,the real vehicle test was used to verify the method of path *** results show that the method has good stability and accuracy.

关键词： path following curvature feedforward control arc fitting simulation analysis experimental verification

The Researches of the Virtual Prototype Modeling and simulation of Some Special Mechanical System

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The Researches of the Virtual Prototype Modeling and Simulat...

第三届国际机械工程与力学会议

作者： Lei HE Jiaguang LUO Xueying HUANG Junsong LI Qijun WU Kedong ZHOU School of Mechanical Engineering Nanjing University of Science & Technology 63856 Unit of PLA No.208 Research Institute of China Ordnance Industries

Based on ADAMS, the virtual prototype of some special rifle is established. By dynamics simulation to the automatic mechanism of the rifle, the influence rules of the dynamic parameters upon the motion of the automatic mechanism are obtained. The simulation results indicate that the required parameters such as firing rate etc. can be obtained by adjusting the parameters of the related parts. The current achievements provide the sound theoretical fundamentals for the structural optimization and engineering design of the rifle scheme.

关键词： multi-body dynamics rifle virtual prototype simulation analysis

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横向并购反垄断审查中的竞争损害模拟分析

Research on Technology of Motor Mechanism in Mining Isolating Switch Breaking Test

产业经济 2016年第3期

作者：余东华王蒙蒙

在Logit模型的基础上构建模拟分析横向并购竞争损害的结构性方程，提出模拟分析的基本程序，并以一汽并购华晨案为例，对横向并购可能产生的竞争损害进行实证模拟分析。结果显示：汽车行业的横向并购能够明显提高汽车产品价格和并购厂... 详细信息

在Logit模型的基础上构建模拟分析横向并购竞争损害的结构性方程，提出模拟分析的基本程序，并以一汽并购华晨案为例，对横向并购可能产生的竞争损害进行实证模拟分析。结果显示：汽车行业的横向并购能够明显提高汽车产品价格和并购厂商的利润水平，而非并购企业的利润提高程度有限；在不考虑效率效应的情况下，该项并购给消费者福利带来了巨大损失，进而导致显著的社会福利净损失。为此，中国汽车行业的大规模并购需要审慎操作、合理引导，参与并购的汽车企业应向消费者适当让渡部分并购收益。对横向并购进行反垄断控制，不仅可以保护市场有效竞争，而且能够维护消费者的合法权益，提高社会总福利水平。

关键词：横向并购竞争损害需求估计模拟分析 horizontal mergers competition harm demand estimation simulation analysis

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Research on Technology of Motor Mechanism in Mining Isolatin...

第30届中国控制与决策会议

作者： Zhang Hong-kui CCTEG Shenyang Research Institute

Based on the analysis of the structure of coal mine isolating switch and working principle, the working process and shortcomings of the existing operation mechanism were analyzed in detailed. The output torque trend of motor mechanism was obtained by analysis of the reaction curve. At the same time, the electromagnetic structure of motor mechanism was designed and the finite element simulation model was established, which was used to simulate the motor rotor, air gap flux density, no-load and load torque. Finally, the breaking test system was designed to verify the experiments. The results show that the motor mechanism can drive coal mine isolating switch to complete the breaking tests reliably, which proved the validity and rationality of the design.

关键词： coal mine isolating switch breaking test motor mechanism finite element simulation analysis

Study on SVG for Reactive Power Compensation and Harmonic Suppression Based on Active Current Separation

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Study on SVG for Reactive Power Compensation and Harmonic Su...

2011 Chinese Control and Decision Conference（CCDC）

作者： Qing Lu,Wei Ni,Xiaohui Wang,Liyun Zhuang School of Electronic and Electrical Engineering,Huaiyin Institute of Technology,Huai’an 223001,China

The static var generator (SVG) with appropriate control method is a good solution to solve the problem of reactive power impact and harmonic pollution which is generated by the nonlinear *** this paper,a control strategy using active current separation and the current indirect control is used for *** active current separation is a method for detecting the harmonic and reactive current,and then the sum of the harmonic and reactive current is used as the value of *** studying on the method,we set up the simulation model and obtained the detection results of this algorithm,and we also get the reactive power compensation *** theoretical analysis and simulation results illustrate the effectiveness and correctness of the proposed method.

关键词： Var compensation Harmonic suppression SVG simulation analysis Active current separation