bluuebunny/crossref_metadata_2025 huggingface dataset:
Parameter Optimization of Compressor Based on an Ant Colony Optimization
Authors: Zhong Mei Peng
Published: October 2012

A mathematical model of operation on air compressors is set up in order to improve the efficiency of air compressors. Parameter of Compressor is optimized by an Ant Colony Optimization (ACO) Particle approach. Volume and its weight of the new compressor are little, and its efficiency is high. An Ant Colony Optimization embed BLDCM module which optimizating the air compressor was put forward. Optimizated target of an Ant Colony Optimization is the efficiency of BLDCM. Optimizated variables are the diameter of low pressure cylinder, the diameter of high pressure cylinder, the journey of low pressure piston, the journey of high pressure piston and the rotate speed of BLDCM. Simulated result shows that the efficiency of BLDCM is more than that before optimizating. The test is done. The result shows that the specifc Power of air compressor is much less than before optimizating on 2.5Mpa. The result also shows that an Ant Colony Optimization which optimizating the air compressor is availability and practicality.
An Optimization Approach for Surgery Scheduling under Multi-Resource Constraints
Authors: Yin Jiao , Xiang Wei , Chen Sai Feng
Published: October 2012

Surgery scheduling under upstream and downstream resource constraints was described as a three-stage multi-resource constrained flexible flow-shop scheduling problem in this study and an optimization approach based on ant colony algorithm was proposed for obtaining an optimal surgery schedule with respect to minimizing the makespan. A resource selection rule and strategy of overtime judging and adjusting was designed to allocate the resources reasonably and to make the scheduling results closer to reality. Compared to actual scheduling, the computerized result shows that the improved ant colony algorithm proposed in this paper achieved good results in shortening total time and allocating resources for surgery scheduling.
Managing System of Manufacturing Process Based on Resource Optimization Deployment
Authors: Peng Wen Li , Qin Zhong Bao , Zhang Wen Ni
Published: October 2012

Some approaches and strategies of building a manufacturing process managing system in a digital enterprise environment were introduced in this paper. The system was based on resource optimization deployment and composed of five subsystems. Firstly, the structure of the whole system's framework and the function of every subsystem were discussed. Then the XML-based data exchange between different subsystems, data access interface specification, and the integration pattern based on XML Web Services were presented in detail. Finally, a successful enterprise application of the system was described. The application result proves that the system was practical and helpful to achieve the order-oriented manufacturing process collaborative management and the social manufacturing resources’ optimization deployment.
The Retrospects and Prospects of Pure Water Hydraulic Technology
Authors: Xu Feng , Zhang Li Xiang
Published: October 2012

Pure water hydraulic technology attracts more and more attention of people due to no pollution, low cost, simple system, and many other advantages. This paper compares physico-chemical properties between pure water and hydraulic oil, concludes that pure water is the ideal medium for hydraulic system. Then it discusses the development of pure water hydraulic technology, introduces the present research situation and development of pure water hydraulic components from home to abroad in the future.
The Roller Disassembly and Assembly Machine Controlled by PLC
Authors: Cheng Guang Zhen , Liu Zuo Qing , Dang Li Hui
Published: October 2012

This paper provides a kind of roller maintain machine. It introduced the structure and the working principle of the roller disassembly and assembly machine. According to the work requirements, selected the PLC Toshiba's F1-20MR，to realize the switching sequence control function. Analyzed machine's work flow, Designed the PLC control program. Point out the advantage that using PLC replaced the original relay logic control systems: flexible application and good generality, high reliability and environmental adaptability; the program is simple to grasp easy.
A One to Multiple Order Allocation Optimization Model of Horizontal Manufacturing Collaborative Alliance
Authors: Gao Jin
Published: October 2012

Horizontal manufacturing collaborative alliance is a dispersed enterprise community consisting of several enterprises which produce the same kind of products. To correctly assign order among member companies of horizontal manufacturing collaborative alliance is one of the most important ways to improve the agility and competitiveness of manufacturing enterprises. For the order allocation problem, a multi-objective optimization model is developed to minimize the comprehensive cost and balance the production loads among the selected manufacturing enterprises. Non-dominated sorting genetic algorithm (NSGA-II) is applied to solve the optimization functions. The optimal solution set of Pareto is obtained. The simulation results indicate that the proposed model and algorithm is able to obtain satisfactory solutions.
A FPGA-Based Long Distance Temperature Measurement System and Control Circuit
Authors: Li Yu Zhong
Published: October 2012

Temperature measurement methods always including contact method and non-contact method, generally speaking, non-contact method used for detecting remote measuring objects temperature, in especially as to particular occasions such as factory workshop. This paper provides a system based FPGA(field programmable gate array)for accurate measure and analysis long distance objects temperature. The system could be used in process of industrial produce fabrication.
Adaptive Iteration Filter for Suppression of Impulse Noise in Color Images
Authors: Wang Gai Hua , Li De Hua , Zhao Tong Zhou
Published: October 2012

New impulse detection and filtering algorithm is proposed in color images. Based on fast peer group filter, the proposed filtering algorithm uses different iteration times to complete filter according to different impulse noise density. The extensive experimental results show that the proposed scheme provides better performance than many of the existing vector filters. Meanwhile, the proposed approach is simple and practical for real-time application.
The Study of PLC Control Technology Application in Motor VVVF System
Authors: Liu Jiang Cai
Published: October 2012

the programmable logic controller (PLC) is the control device which is the most commonly used in the industrial control system. It's popular among the control system designer and maintaining staff on account of its good reliability, anti-jamming and practical application. This paper studies the PLC control technology application in motor VVVF system, firstly we introduce the basic working principle and features of the PLC, then supply some technical guidance for the PLC control technology applications combined with DC motors and AC induction motors in PLC control system.
Quantization Strategies of RFID Routing in Internet of Things
Authors: Yu Song Sen , Huang Xiao Peng , Yang Jian
Published: October 2012

This paper researches wireless RFID routings in Internet of Things based on the idea of quantization. The researches include the obtaining of routing contexts, the measurement of contexts in evaluating the performance of routing, methods for controlling the quantification of contexts, the realization of a perceptive computational model, the mergence of the security policies. Its goal is to construct a precise lightweight and perceptive model of wireless RFID routing protocols in Internet of Things, and to lay a foundation for accelerating the developments in Internet of Things.
The Study Based on IEC61850 Integrated Substation Automation
Authors: Xu Peng Fei
Published: October 2012

The current power system, the internal means of communication, the Statute of the IEC61850 standard substation within the signal communications, to facilitate a variety of IED in the substation management, and the interconnection between the devices can greatly improve the level of the substation automation.
Centralized Control Standing Application and Development in the Automation System
Authors: Ding Xue Feng
Published: October 2012

The central control station is under the level of grid scheduling, in order to ensure grid safety, reliable and economic operation of modern control technology and unattended substation. Centralized control standing grid makes grid scheduling more real-time, secure, reliable, and enable enterprises to lower operating costs, to achieve downsizing to improve efficiency, improve production efficiency.
Network Automation System Synchronized Clock Real-Time Monitoring System for Research
Authors: Xi Chun Miao
Published: October 2012

Describes how to implement the automation system clock device synchronization, real-time monitoring system, and described the effect of the application.
Application of Precision Time Protocol on Networked Control Systems
Authors: Yang Chuan Shun , Kong Xiang Ying
Published: October 2012

In order to overcome the problem of the clock synchronization accuracy between scattered nodes was not high on traditional networked control systems, proposed a new method of using the IEEE 1588 standard for precision time protocol. First studied the principle and algorithm of precision time protocol, the best master clock algorithm and timestamp detection methods. Then presented the timestamp detection method with the use of software and hardware on networked control systems to improve clock synchronization accuracy, and analyzed the feasibility of the method in theory. Finally, tested accuracy of the clock synchronization, and the test results showed that synchronization accuracy can reach nanosecond, can meet the application requirements of the networked control systems.
Study of the Industrial Wireless Control Network Security Based on Elliptic Curve Cryptography
Authors: Ye Li , Liu Feng
Published: October 2012

Industrial wireless control network brought great convenience in industrial production, and security issues was very important. This paper analyzing the characteristics of the wireless industry control network, and presented a perspective which based on elliptic curve cryptography system, at last, introduction to design a hierarchic structure of the ECC integral solution, then make it better applied to the industrial wireless environment.
The Fuzzy Rule Based the BDFM Torque Control
Authors: Chen Peng , Zhai Jian Yang , Zhu Zheng
Published: October 2012

Combining with some fuzzy of the direct torque control and the fuzzy control which is often used in the traditional AC motor control,we put forward a direct torque control theory based on the fuzzy rule. The brushless doubly-fed machine(BDFM) closed-loop control system with the direct torque control based on the fuzzy rule is simulated by using of the Matlab/Simulink software, and the simulation results show that the closed-loop control method is correct and effective.
The Design of Adaptive Noise Control System Based on Neural Network
Authors: Cui Lu Jun , Shang Hui Chao , Zhang Gang , Li Yong , Zhao Ze Xiang
Published: October 2012

The present work investigated the adaptive noise control system based on neural network. The structure and the characteristics of ANC algorithm were introduced in detail, at the same time, and the detailed demonstration of the BP neural network was given. Contrast verification experiments were given through the Matlab, and the simulation results have verified the effectiveness and practicability of the algorithm for the adaptive noise system in real control system. Through these methods, the disturbance of various noises in input signal could be reduced effectively.
Response of Sensitive Device of Piozoresistive Accelerometer to Load
Authors: Zhang Jian Hong
Published: October 2012

The sensitive characteristics of sensitive device which was closely related to the mechanical properties of its micro elastic cantilever play a role in analysing the performance of piezoresistive accelerometer. To make a research on the response of the system to load, the deformation model of micro elastic cantilever of sensitive device belongs to piezoresistive accelerometer was built based on the method of system identification in this article to analyze their mechanical properties under static external load, the deformation equation was deduced and the quasi-dynamic deformation model of micro cantilever was obtained according to the principle that displacement was directly proportional to load. The conclusion could be used for evaluating the dynamic behavior of structure on virtual operation which would provide reference for optimization design of micro structures.
The Effects of Phase Retardation of Wave Plate on Cesium Magnetometer Sensitivity
Authors: Li Qing Meng , Zhang Jun Hai , Li Li , Zeng Xian Jin , Sun Wei Min
Published: October 2012

The paper described a new magnetometer with cesium vapor in the spin-exchange-relaxation-free (SERF) regime. The variation behavior of phase retardation of the /4 wave plate (in the probing beam direction of this magnetometer) with temperature was introduced, which directly affected the sensitivity of the magnetometer. A detail theoretical analysis was expressed to give the temperature properties of a quartz wave plate. The retardation reduced 0.84 when the temperature increased 1°C for the wave plate with thickness of 2.24 mm and wavelength of 852 nm. According to the various phase retardations of wave plate in different temperatures, the relative intensity of the detection signal in this magnetometer was proposed.
Based on the Automatic Control System of Industrial Robots
Authors: Ding Xue Feng
Published: October 2012

The successful application of robotics is an important way to enhance the engineering machinery and equipment, scientific and technological content. The definition of industrial robots and Research, and simple control of industrial robots and the final flow chart is proposed to adapt to the development of machinery industry, according to the agile manufacturing strategy, and looking forward to its logical design of the development trend.
Co-Simulation Technology Development and Application of Electromechanical System
Authors: Zhao Hong Yu , Liu Bao Qing
Published: October 2012

current electromechanical products are moving in the direction of large integrated and small intelligent, a mechanical and electrical equipment is usually composed of many parts, we not only need physical test to know whether these parts perform well or not, but also need simulation analysis for many times to verify the performance of the whole device. Firstly, this paper depicts the current development situation of mechanical and electrical co-simulation technology, then researches its practical application combined with industrial production.
Study on Transient Power Quality Disturbance and Detection Method
Authors: Lu Bo Yong
Published: October 2012

Nowadays, in electrical energy, transient power quality disturbance issue is one of the “stubborn problems” that plagued the power sector and users. This paper focuses on analyzing the causes and effects of transient power quality disturbance, sequentially finds out scientific testing methods and sums up its control methods.
Variable Condition Bearing Fault Diagnosis Based on Time-Domain and Artificial Intelligence
Authors: Hu Qing Zhong , Zhang Shu Lei , Yang Sheng
Published: October 2012

Aim at some problem in fault diagnose: the characteristic frequency depends on the speed, the spectrum is complex , which are easy to diagnose error when in the variable conditions, and it is often difficult to identify the fault positioning in the frequency domain. the paper puts forward a new method: Variable condition bearing fault diagnosis basing on time-domain and artificial intelligence , not depend on speed and frequency domain. This method use vibration signal, calculates the kurtosis, skewness, rms etc 12 time-domain value, then these character vectors are sent to the neural network classifier to complete fault type pattern recognition, Finally, the same faults are sent to the next neural network for fault positioning and damage extent identification. The experimental result showed that using this method can obtain very good effect.
Renovation for Guiding Trail of Machine Tool by Milling Instead of by Scraping
Authors: Xia Xiang
Published: October 2012

The paper has taken C618 machine tool as an example to introduce the technical process for renovation of guiding trail of machine tool, as well as the adjustment of the machine tool under renovation and the geometric precision of the machine tool after being renovated. The renovation method has been proved by practices to be of certain economic and social benefits, and therefore is of practical use and referential value.
Design and Optimization of Missile Three-Loop Autopilot Based on Performance Indicators
Authors: Zhao Lin Dong , Tang Sheng Jing
Published: October 2012

A classic design method in frequency domain was used in preliminary design of three-loop autopilot. The preliminary design results derived out the bounds and initial values of optimization variables. Based on the system performance indicators, an optimization model was proposed including the use of weight factors and typical values of performance indicators. The optimization design was realized and verified with the use of genetic algorithm (GA) built in Matlab Optimization Toolbox. The design instance shows that the optimization model and strategy have a good effect and could meet the optimization needs when different performance focuses are desired.
A Novel Estimation Method on Delta Engine Gas Temperature of a Certain Aero-Engine Based on Flight Data
Authors: Sun Wen Zhu , Qu Jian Ling , Zhou Yu Ping , Liu Mei Jie , Gao Feng
Published: October 2012

A novel estimation method on Delta Engine Gas Temperature (DEGT) applicable for condition based maintenance of a certain military aero-engine was proposed in this paper to solve the problem that maintenance technique for national military aero-engine relatively fell behind. The application perspective of this proposed method in the condition monitor of military aero-engine was also discussed. The experiment analysis on a group of actual flight data indicated that the DEGT obtained via the proposed method was matched to the actual degeneration performance of the aero-engine, which could well reflect the condition of the aero-engine.
The Slipping Analyses of the Belt Conveyor between the Belt and the Roller
Authors: Chen Bing Yao , Zhang Dong Sheng
Published: October 2012

In this paper, the slipping of belt conveyor for the normal stable operation and full load starting in between belt and rollers are investigated. The results illustrate that the resistance of the belt conveyor in the normal and stable operation is less than that of the full load starting operation due. The possibility of slipping in normal and stable operation is less than that of the slipping start running at full load condition. Therefore, in order to check the conveyor belt slipping, we should pay attention to the full load start condition, can not check under normal and stable operation of the skid. The application of soft-start technology to solve the problem of slipping when starting was also proposed.
Generation Strategy Optimization Based on Peak Regulation Right Transaction Mechanism
Authors: Li An Jun , Yang Hong Ming , Deng Shu Lei , Liu Bao Ping
Published: October 2012

A bidding system of peak regulation right based on multi-agent is proposed according to the property of the peak regulation right. Then, the biggest goals of social benefits of all power generation companies are developed based on bidding system. Simultaneously bidding strategy of peak regulation right of the biggest goals of social benefits of all power generation company agents and internal cost optimization strategy of electricity generation companies are respectively raised for the goals. Example analysis shows that the proposed Bidding system takes on better viability and effectiveness.
Comparison Simulation of Friction Heat and Joule Heat in Electromagnetic Railgun
Authors: Jin Long Wen , Lei Bin , Li Zhi Yuan , Zhang Qian
Published: October 2012

A large amount of heat will be produced in the railgun launching process, the heat-induced temperature mutation is an important cause of material failure. To obtain temperature field variation law in railgun, mechanism of heat generation was analyzed according to the basic working principle of railgun. Temperature field was discussed through the method of combining theoretical calculations and Finite Element simulation. The results show that friction heat results in temperature rise on the materials only near the contact interface; temperature rise under the action of current heat around the corner of U-shaped armature is obvious, while maximum temperature is appeared at the side surface and exceeds the melting point of the armature material. The temperature of railgun mainly depends on the current value, while friction heat has smaller effect on it.
An Improved Integral Proportional Guidance Law Based on Optimization and Variable Proportional Factors
Authors: Yang Guan Tong , Tang Sheng Jing , Guo Jie , Zhu Da Lin
Published: October 2012

For image guided missile, in order to avoid frame collision, the maximum needed frame-angle of the seeker should not exceed the maximum available frame-angle in flight. Subjected to diameter and volume of the seeker, the required frame-angle needs to be reduced. By combination signal of frame-angle, three different improved guidance laws are discussed. By using of special developed optimization scheme, the integral proportional guidance is selected finally for its best effect. For purpose of reducing required overload of the missile, further improvement of the guidance law is generated by using variable proportional factors. The simulation results show that after using of the final improved guidance law, the maximum required frame-angle is reduced by 1.5, the required overload of the missile at the beginning of tracking is reduced from 5.8 to 2.4. According to the results, the effectiveness of the improved guidance law is verified.
Comparison of the Hyperbolic Perturbation Method and the Hyperbolic Lindstedt-Poincaré Method for Homoclinic Solutions of Self-Excited Systems
Authors: Chen Yang Yang , Yan Le Wei , Zhao Wei
Published: October 2012

The comparison of the hyperbolic perturbation method and the hyperbolic Lindstedt-Poincaré method for homoclinic solutions of self-excited systems is studied in this paper. The homoclinic solution of a generalized Van del Pol system with strongly quadratic nonlinearity is analytically derived by both of the methods. The critical value of the bifurcation parameter under which homoclinic trajectory forms can be determined by the both of the perturbation procedures. Typical numerical examples are studied in detail and compared to illustrate the accuracy and the efficiency.
Research in Numerical Simulation of Lager Multi-Scale Water Conveyance Tunnel Based on Mixed Time Integration Method
Authors: Zhao Jun Jie , Yang Yan Zhi
Published: October 2012

The global integration time step of multi-scale model is subject to local detailed model, resulting in lower computational efficiency. Mixed time integration method uses different integration time-step in different scale model, it can effectively avoid the above problem. Rest on a large-scale water tunnel under construction, in order to achieve the synchronization of the global and the local simulation, the paper establishes multi-scale finite element model of the tunnel, and calculate it by mixed time integration method. The final calculation and analysis show that the algorithm can guarantee the computational accuracy of multi-scale numerical simulation, and can effectively improve the computational efficiency, it can also provide references for related tunnel project.
Fractional order PID Based Control Strategy for the Valve Plant of Hydraulic Transformer
Authors: Liu Shu Nan , Xie Dan Tong , Jia Shu Qiang , Shang Tao , Yao Yong Ming , Zhao Wei
Published: October 2012

Aiming at the pressure control of hydraulic transformer (HT), the fractional order PID (FOPID) controller is proposed for the control of the position of the valve plate. The assignment system of the HT is carefully modeled. To optimally determine the parameters of the FOPID controller, a self-adapting differential evolution algorithm is employed. Numerical simulation is conducted to investigate the proposed control strategy. Both step response and sinusoidal command signal tracking of the servo system is assessed, and the results demonstrate that the proposed control strategy is obviously superior to the conventional PID, Fuzzy Logic Controller (FLC) and fuzzy-PID control strategy, and can afford precise tracking performances. It is suitable for the precise adjustment of the output pressure of the HT.
Analyse of the Sub-Munitions Fuze Reliability
Authors: Qin Dong Ze , Fan Ning Jun
Published: October 2012

In order to explore the unexploded ordnance problem of cluster munitions and find the solutions,M85 Sub-munitions reliability models were established,and the models were simulated by applying the Monte Carlo method.The causes of failure and influencing factors of the dual-purpose improved conventional munitions M85 have been analyzed according to experimental data, so these results show reliability models are right.
Simulation of Drilling Micro-Hole by a Dual CO2 Laser Beam Irradiated Sticking Plaster
Authors: Rao Zhi Ming , Xiao Xian Bo , He Zhi Fang
Published: October 2012

We explore a simulation model of drilling micro-hole in sticking plaster heated with a dual CO2 laser beam. This paper applied numerical simulation of temperature by using finite element analysis software Ansys to study a model of drilling on sticking plaster. A dual CO2 laser spot sizes ranged from 0.15 to 0.2mm radius with axial irradiance power levels of 50-100w. For temperatures above 450°C, sticking plaster would be vaporized. The size of ventilation holes changed with beam power and laser spot diameter. The width of the hole is increases with the increasing laser diameter and with the increasing laser power. These results can guide to laser drilling experiments.
The Application of Total Least Squares Method in Data Fitting of Speed Radar
Authors: Chen Cheng , Liu Chang Jin
Published: October 2012

For acquiring the initial velocity of high-speed object, it needs data fitting to get the unknown parameters. Least squares method(LS) is usually uses to complete this work, but LS method takes no account of the errors in the observation matrix, not only may makes error in unknown parameters' fitting, but also do harm to the further analysis. Therefore, this paper lead total least squares method(TLS) into data fitting, it can at the same time in consideration of observation data and its error margin, and at last in actually measure data analysis to prove TLS compare to LS enjoy higher accuracy.
Establishment of an Oxidation Ditch Model Based on Flow Pattern and ASM1
Authors: Lan Mei , Liu Xiao Lu , Li Wen , Zhao Jun
Published: October 2012

The oxidation ditch sewage treatment comprehensive model was established on researching water transfer equation of triple oxidation ditch system and ASM1 （activated sludge mathematical model No.1). In addition, the model program is written by the MATLAB language, the results could be used for designing, simulating and optimized operating of the oxidation ditch system.
Comparison between New Concrete Filled Steel Tube Frame Structure and Steel Frame Structure
Authors: Wang Ying , Li Miao , Xu Jin Hua , Zhang Zhe
Published: October 2012

Concrete filled steel tube (CFT) structure has advantages of the high tensile strength and ductility of steel in addition to the high compressive strength and stiffness of concrete. This research proposes a new CFT column-CFT beam frame structure. In order to validate the cost performance of the new CFT column-CFT beam frame structure, designs were carried out for building frames using both the new CFT column-CFT beam frame structure and conventional steel frame structure. The amount of consumed materials and cost estimations of each designed new CFT and conventional steel building frame are analyzed and compared. The result shows that the new CFT column-CFT beam frame structure is able to exhibit high cost performance than conventional steel frame structure.
Study on Seismic Performance of Infilled Frame of Underlying Weak Layer
Authors: Lei Guang Yu , Zeng Yu Yao , Jin Can Guo
Published: October 2012

After the Wenchuan earthquake, a large number of infilled frame structure of underlying weak layer (the bottom of non-filled walls, the upper wall of clouds filling) of the housing system did not appear "weak beam strong column" of the failure mode. Established pure frame structure of finite element model which considered the quality of in filled wall without taking into account of its stiffness and strength and the frame of finite element model which contains filler wall, and carried out elastic-plastic time-history analysis with established finite element model of two under earthquake, through analysis and comparison understand reasons which infilled frame structure of underlying weak layer did not achieve the "weak beam strong column" ductile failure mechanism, and further explored how to achieve "weak beam strong column" failure mechanism for infilled frame structure of underlying weak layer, raised a number of assurance measures.
Arrangement Principle of Hoop-Layers of Imitating Bamboo Drum Type Tridimensional Parking Structure
Authors: He Yong Jun , Liu Xiao Hua , Zhou Xu Hong
Published: October 2012

Considering the structure type and load feature of vertical lifting tridimensional parking structures are similar to those of bamboo, a new structure arrangement style of tridimensional parking structure is presented, that is to set hoop-layers like bamboo knots at its proper height, according to the imitating bamboo principle that any two adjacent hoop-layers have equal stability and lateral displacement. The static and stability property of imitating bamboo structure and non-imitating bamboo structures is studied. It is shown that the lateral displacement of imitating bamboo structure is constrained effectively and the storey relative lateral displacement becomes smaller and more uniformly distributed; additionally, the internal force mutation of columns is relatively moderate and resisting overturning ability of structures is enhanced; moreover, the overall stability of structures controlled by equivalent short columns results in the great improvement of stability bearing capacity. All above verifies the rationality of the imitating bamboo principle.
Experimental Analysis on Low Temperature Welding Construction Method of Big Span Steel Truss Structure
Authors: Xiang Chang Sheng , Liu Jiang , Li Qing Fu
Published: October 2012

The welding quality of the steel structure is one of the most important segments in the whole construction project, especially in the condition of special geographical environment and wicked climate. In this article, by means of the mechanical test and finite element simulation analysis, a welding treating technology has been summarized in the subzero surrounding, which is based on the fundamental of component size selecting, preheat, heat preservation, and change of the ambient temperature including the rising material temperature before welding. Therefore the thermal crack and cold crack can been effectively eliminated. Rigorous controlling the temperature of the welding procedure and scientific construction play an important role to ensure the welding quality of the big span truss beam and column.
The Elastic-Plastic Analysis on Prestressed Concrete Cable-Beam Structure System
Authors: Xie Xin Ying , Yin Xin Sheng
Published: October 2012

It introduces the current research status about prestressed concrete cable-beam structure system at home and abroad, and anylyzes the phase of elasticity-plasticity by the FEM software.In this paper ,it builds the geometric models of slabs in different thickness and gets all kinds of results.It compares the results of different slabs and gets the conclusion that the working mechanism of beam changes with the quantity adding of cable.
The Effect of Submarine Pipelines’ Distortion when Original Parameters Are Changed during Laying
Authors: Geng Hui Hui , Wu Jun Yang
Published: October 2012

The mechanics model about submarine pipelines during installation is based on the theory of geometrical nonlinear great distortion. The U.L method is adopted as solving problem about the contact between submarine pipeline and seabed, the results obtained by this method are equally accurate and less computational work is need when solving pipeline’s non-linear great distortion. According to select different original parameter during laying pipeline, the bend distortion to submarine pipeline is calculated and the effect of bend distortion to submarine pipeline is analyzed.
Based on Experiment of Constitutive Model of Load-Bearing Insulation Masonry
Authors: Liu Xi Jun , Liu Lin Xiang , Wang Yu Mei
Published: October 2012

In order to obtained the constitutive equations of thermal insulation masonry, the four masonry with different angles has pressed. Study on thermal insulation of masonry compressive mechanical parameters of constitutive equation and two-stage by compression stress-strain curves obtained in the servo press machine tests and data processing. The Basic mechanics parameters can be provided for finite element analysis of thermal insulation composite wall. The experiments showed that the constitutive model is discretization and the maximum stress and strain by press machine testing is different from brick masonry. The constitutive model is close with curve by press machine testing. The performance of mechanics in thermal insulation wall can be application by the stress-strain curves of thermal insulation of masonry. The stress-strain curves based experiments can be used finite element analysis of thermal insulation wall.
Optimum Design on Raft Foundation with Considering the Interaction of Structure and Foundation and Soil
Authors: Wang Xiao Qiang , Zhang Dong Xiao
Published: October 2012

Using FEM software, ANSYS, in this paper, from analyzing the effect of raft concrete strength and raft thickness on raft foundation, an optimum design was given, which offered the design and calculation of raft foundation a theoretical basis.
Stability Analysis of the Cutting Slope Considering the Influence of Water Content of Soil
Authors: Ma Qiang , Xiao Heng Lin , Hu Qi Zhi , Li Li Hua
Published: October 2012

Based on the method of strength reduction, numerical simulations were carried out to analyze the stability of the cutting slope. The direct shear tests of slope soil samples with different water content were carried out, and the safety factors of stability of the cutting slope were investigated with different cohesions and internal friction angles. At last, displacements and safety factors of stability of the slope with drains and without drains were calculated, and the observations of displacement of the cutting slope in field were also carried out. The results show that: The water content of the slope soil has great effects on the strength parameters, the cohesion and the internal friction angle decrease with the increase of the water content, and the effect is more significant on the cohesion than that on the internal friction angle. The safety factor of stability for the slope increases with the increase of the strength parameters, hence it increases with the decrease of the water content. The section of the slope without drains in the field is unstable, while the section with drains maintains stable.
A Practical Design Method for Energy Dissipation Structure
Authors: Chen Min , He Guo Jing , Liu Chang
Published: October 2012

Energy dissipation structure is favored by designers because the earthquake energy can be dissipated by the dampers, which can avoid or reduce the damage caused by earthquake. However, the energy dissipation structure design is complex and the most domestic designers can not master it easily. In this paper, a simple and practicable design method for viscous damper dissipation structure by using the PKPM design software is proposed based on a 7-storey frame structure in highly seismic region. Firstly, lower half or one degree for the design intensity to design out an uncontrolled structure. Secondly, determine the supplemental damping ratio required for the fortification intensity via modal analysis method of PKPM software, and identify the numbers of the required dampers as well as their corresponding installation positions in line with the methods in the seismic code of China. Finally, the ETABS program is adopted to conduct the time-history analysis of the designed dissipation structure, showing that the proposed method in this paper can produce a satisfied result.
Study of the Combined Effect of Steel Reinforcement and Expansion Agent on the Crack Resistance of Ready-Mixed Concrete
Authors: Chen Gang , Yuan Shuai , Peng Yu Bo , Yang Wei Jun
Published: October 2012

The objective of this work is to find the law of combined effect of steel reinforcement and expansion agent (EA) on the crack resistance of ready-mixed concrete by doing flat-plate method experimental study on the crack resistance of ready-mixed concrete with EA, also with EA and steel reinforcement, with a deep analysis of the mechanism of reinforcement and EA on ready-mixed concrete. The paper comes to the role of ready-mixed concrete cracking performance which is influenced by reinforcement steel and EA.
Experimental Study of RC Beams Strengthened with Prestressed near Surface Mounted Helical Rib Steel Wire
Authors: Zhang Chun Sheng , Hao Hui Min , Zhang Mei Xiang , Ding Ya Hong
Published: October 2012

A new reinforcement technique with prestressed helical rib steel wires is presented, and one control beam, three strengthened beams under monotonous loads are tested. The flexural capacity, load-deflection relation, cracks and deformation of reinforced concrete beams are systematically studied under the same initial prestress level and amount of reinforcement, different groove size. The test results indicate that the strengthening technique could significantly improve the first-crack load, steel-yielding load, ultimate load of the beams, and improves the service performance of the strengthened beams. The high performance of the helical rib steel wires is allowed for a better utilization. The results provide a reference for engineering applications.
Contact Nonlinear Numerical Simulation of Steel and Concrete in Wind Turbine Foundation
Authors: Wang Chao Fei , Lv Wei Rong , Luo Wen
Published: October 2012

Effective simulation and analysis about wind turbine foundation simplified model experiment were conducted by using general finite element analysis (FEA) program ANSYS. Nonlinear finite element model with surface-to-surface contact pair was built to study the strain distribution of the steel interface and slip between steel and concrete. Relevant strain and spreading length curves under the load of every class were obtained. The numerical simulation results were in good agreement with the experimental results. And proper parameters of bond-slip relationship for steel and concrete in wind turbine foundation were confirmed. The finite element model established and analysis results can provide a theoretical reference for later research, and have significant value for optimal design of wind turbine foundation.
The Imperfection Sensitivity of Sheet Space Structure Based on the Contact Interactive
Authors: Jin Tian Jiao , Guo Xiao Ming , Sun Wei
Published: October 2012

The initial geometric imperfections and the contact problem between sheets and skeletons are two key issues of the stability analysis of sheet space structures. In this paper ,the distribution law of the critical load is found out, the appropriate sample number and the critical load value formula are chosen for stochastic imperfection method, while the value of probability reliability is ensured. The results of contact model and fully coordinated model are compared to indicate that the effect of contact must be considered in the imperfection sensitive analysis of the structure after stochastic imperfection sensitivity analysis of sheet space structures. The paper also raises the quantitative indicators to characterize the imperfection sensitivity of sheet space structure, and it is the necessary preparation to quantify the sensitivity of structures.
Research on the Method for Force Finding of Prestressed Cable Net
Authors: Zhang Feng
Published: October 2012

Cable net is a typical kind of flexible space structure, the effective stiffness forming need be through the prestress. The distribution of the prestressed need be through morphological analysis to find in finish. Based on the analysis of two methods: force reduction equilibrium method and inverse iteration method, the basic thought and algorithm of the two methods were analyzed. The numerical results indicate that the large cable network structure can be obtained through analysis for force satisfies given shape of prestress distribution.
Push-Down Analysis of RC Frame Structure with Damaged Column
Authors: Seo Soo Yeon , Kim Jeong Hun , Yeon Jae Yeong , Park Hyung Joo , Choi Ki Bong
Published: October 2012

In this study, a push down analysis was performed for reinforced concrete (RC) frame building with collapsed column at lower floor by shock due to abnormal load in order to find progressive collapse process of building. The nonlinear flexural behavior of each structural element was defined from sectional analysis by using X-tract program. For push-down analysis of frame structure, Zeus-NL program was used. Main parameters in the analysis are location of damaged column and story of building. As a result, the deflection at the time of collapse of internal column was lower than one at the time of collapse of external column. In the frame structure with severely damaged column at lower floor, the higher the story was, the smaller the change of moment in beams at upper floors was. And, deflections of beams were found to appear evenly. This can be judged to be caused by a beam's suspension action.
Forecast Study on Large Deformation of Surrounding Rocks in Mountain Tunnels
Authors: Zhang Guo Hua , Wu Shang Jie , Chen Li Biao
Published: October 2012

Shilin tunnel is a separated bi-directional four-lane highway tunnel, and its distinctive geological conditions and fault structure result in frequent geological disaster like large deformation. Construction of tunnels were seriously hampered, and the project was delayed, and the cost increases simultaneously. During construction of Shilin tunnel, accurate forecast of geological condition of surrounding rocks and possibilities of large deformation disaster was done through long distance TSP detection and short distance geological radar detection. Then Effective forecast on large deformation disaster to ensure safety of tunnel construction was carried out through adjusting excavation methods and support parameters, and close monitoring crown settlement, convergence, pressure of surrounding rock and pressure of steel-arch. This way is effective for like large deformation under similar conditions, this successful experience will apply reference for similar projects.
Application of Ground Penetrating Radar in Detection of Tunnel Lining Structure Fracture and Processing Measures
Authors: Chen Qiu Nan , Huang Xiao Cheng , Li Jian Xin
Published: October 2012

Based on electromagnetic propagation theory, and used reflected wave detection method of Ground Penetrating Radar. To detect the tunnel with empty areas, void areas, non-dense areas, voids and other defects by the GPR. According to Jianshan Tunnel on-site detection, combined with practical examples to illustrate the GPR as a mean of nondestructive testing. The existence of tunnel defects and their reasons are analyzed comprehensively, and a series of processing measures are proposed.
Construction Simulation and Monitoring Data Analysis on Influence of Tunnel Excavation on the Treatment Structure of Karst Cave
Authors: Liu Hui , Deng Xiao Zhao
Published: October 2012

Baixugong tunnel is a big karst tunnel in Qing-Lian highway, and the construction environment is complexity. The structure of pile-pile cap-supporting wall-connection beam is used to treat the karst cave tunnel. Using simulation results and monitoring data to reveal the influence of tunnel excavation to treatment structure. The treatment structure in the karst tunnel is safe and reliable. The supporting wall stress and pile strain all increase accelerating during the advance of excavation face, then stabilize gradually. The construction simulation results are similar with the monitoring data, which demonstrates the important role of treatment structure in the karst tunnel.
Structural Analysis and Study on Support Technology of Refuge Chamber of Mine
Authors: Li Fang Wei , Jin Long Zhe , Han Hai Rong , Zhang Xiao Chen
Published: October 2012

As the down-hole refuge chamber is the last life support for miners, its stability structure is especially important in its design. This paper tested the loose circle of the surrounding rock of refuge chamber with double-hole method, proposed the related parameters of chamber support, and conducted numerical analysis for the deformation, damage and supporting effect of the surrounding rock by using FLAC. The result shows: the loose circle radius of this refuge chamber is about 1.7~2.0m；the surrounding rock of refuge room belongs to IV class with large loose circle, designs support parameters with anchor net spray built-up arch theory; the numerical analysis shows that the floor suffers from floor heave, so it needs to be set up with anti-arch structure and be filled with reinforcement material.
A Geophysical Prospecting and Survey Research on Maojingba Tunnel Project
Authors: Mu Huan Sheng
Published: October 2012

This article successfully gives an elaboration on the operating principle of seismic reflection, acoustic logging as well as the methods and techniques through the engineering geological investigation on Maojingba super long tunnel, and resolves the key technical issues, thus providing valuable references for future similar projects.
Adverse Engineering Properties of Banxi Group Slatealong Changsha Metro Line 2
Authors: An Chen
Published: October 2012

For comprehensive study the adverse engineering properties of Banxi Group slate along Changsha Metro Line 2, slate samples were tested and analyzed to research their mineral composition, physical and mechanical properties, weathered properties and disintegration. Test results show that sandy slate and argillite interbedded with each other, the main minerals of slate are quartz and clay minerals, the oxide are SiO2、Al2O3, the natural compressive strength of sandy slate is five to eight times that of argillite, its softening coefficient is less than 0.75, slate is easy to soften, argillite is easy to disintegration and the disintegration of sandy slate is medium grade. The adverse engineering characteristics lead to slate rock mass uneven with hard-soft. Differential weather of slate causes there are some bedrock weathered slots along Changsha Metro Line 2. So during construction, appropriate process and tool must be selected, control the tunnel oriented, strengthen the protection and shorten the bare time of rock mass.