bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanical Response and Damage Analysis of 3D Multi-Structured Knitted Composite under Quasi-Tensile Loadings
Authors: Jia Xi Wen , Su Jia Zhi , Zheng Yi Zhu , Gu Bo Hong , Sun Bao Zhong
Published: February 2012

The mechanical response and damage mechanism of a 3D multi-structured knitted composite under quasi-tensile loadings are investigated based on experimental results. The multi-structured knitted composite consists of two knitted fabrics with weft double-faced interlock knitted fabric as core material and biaxial warp-knitted fabric as surface layer in the above-mentioned composite system, respectively. The tensile stress against strain curve is obtained to analyze the mechanical behavior. Furthermore, the failure mechanisms of 3D multi-structured knitted composite are discussed from the experimental observations by the initiation and propagation of damaged zone in knitted composites.
Development of Cam Design and Simulation System
Authors: Bi Jian Ping , Wang Xin Li
Published: February 2012

Based on the VC++ development environment and Solid works software, a system about cam design and motion simulation is developed. First, build up the input interface for input parameters, output values and curve display such as velocity and acceleration according to the input parameters. Then the data is imported into the Solid works software as input data for motion simulation. Therefore, the velocity and acceleration are simulated. The results show that the cam design system can be run and give help for cam design application.
Preparation and Characterization of Polyaniline / Montmorillonite Composite by Situ Emulsion Polymerization
Authors: Deng Si Si , Li Guang
Published: February 2012

Polyaniline(PANI)/montmorillonite(MMT)composites were prepared by situ emulsion polymerization of aniline at 0 °C in the presence of MMT in aqueous solution with ammonium persulfate (APS) and dodecylbenzene sulfonic acid (DBSA) as oxidant and surfactant (acid dopant), respectively. Infrared spectra revealed the shift of N-B-N stretching vibration band, suggesting the presence of interfacial interactions between PANI chains and clay layers. X-ray diffraction showed an increase in the interlayer spacing from 1.26 nm for MMT to 1.468nm for PANI/MMT10%, signifying PANI was intercalated into the MMT galleries and the expansion is in agreement with the intercalation of single chains with extended chain conformation. Thermal gravimetric analysis suggested that the introduction of MMT clay resulted in improvement of thermal stability of the composites. It was found that when the MMT content reached a certain limit (30%), the PANI/MMT showed higher conductivity than pristine PANI .
First Principles Study on Rutile SnO2 Improving Gas Sensor Properties of Porous SnO2-In2O3 Composites
Authors: Cao Yu , Zhou Xiao Long , Cao Jian Chun , Peng Yuan Yuan , Chen Jing Chao , Yu Jie
Published: February 2012

we built the rutile SnO2 to study SnO2 improving gas sensor properties for rutile structure of SnO2 existing in the SnO2-In2O3 composite materials by X-ray analysis. The surface (110) of SnO2 is a stable structure by analysis of surface energy. Compared with oxidized surface (110), reduced surface (110) has better conductivity and stability. As a result, the CO adsorption changes the electric conductivity of the whole reductive (110) surface, and leads to the deviation of Fermi energy. Therefore, it is an important reason affecting gas sensor properties of the SnO2-In2O3 composite materials. By calculating and simulating the density functional first-principal, the research of the adsorption of rutile SnO2 towards CO provides a theoretical foundation for the argument of the gas sensitivity of porous SnO2-In2O3 composite materials towards CO with the increasing of SnO2 contents.
Magnet Skew Technology Investigation for the Reduction of PMLSM Thrust Ripple
Authors: Cai Jiong Jiong , Ren Jia Qi , Cheng Liang , Ye Yun Yue
Published: February 2012

Thrust characteristics of permanent magnet linear synchronous motor (PMLSM) are analyzed. It shows that frequency spectrums of thrust ripple, which are mainly caused by end-effect, are quite similar for linear motors with different pole/slot combinations. To apply magnet skew technology, a method using piecewise magnet for skewing factor computation is introduced. According to this piecewise method, a policy for analyzing 3D skew effect model using 2D FEM algorithm is investigated. The application on a 14-pole/12-slot PMLSM validated the algorithm.
Slow Cooling Treatment of High-Alloyed Superalloy
Authors: Lu Xu Dong , Du Jin Hui , Deng Qun , Zhong Zeng Yong
Published: February 2012

The very poor hot workability of high-alloyed GH4742 superalloy is represented in the aspects of very narrow available deformation temperature range, high deformation-resistant force and poor ductility. In this paper, a special heat treatment to change the ingot microstructure is proposed to improve the hot workability of the GH4742 superalloy. The' phase with a appropriate size and morphology and tortuous grain boundary were obtained by slow cooling in the ' two phases region after solution treatment. Modified microstructure induces that the hot deformation flow stress of GH4742 superalloy was decreased effectively and hot deformation plasticity was increased obviously.
Mechanical Properties and Heat Treatment Research on Machinable Glass-Ceramic
Authors: Wang Shuang Hua , Zhang Xiu Li , Zhang Heng
Published: February 2012

A new kind of machinable glass-ceramic was prepared by the sintering methods which has the high KIC, flexural intensity and other good mechanical properties so that it could be machined using the normal machinable methods such as turning, milling and drilling. The hardness and flexural intensity which was the main mechanical property factor influenced the machined ability was researched in detail with the help of TG-DSC, SEM, metalloscope, Hv hardness and flexural intensity measurements. Based on the orthogonal design methods (L2554) and numerical solution, the effects of the heat treatment about devitrification on the mechanical properties were analyzed and concluded that the mechanical properties was mainly influenced by the crystal temperature and heat holding time.
Experimental Study on Temperature Characteristics of Water Lubricated Rubber Bearing
Authors: Cheng Yong Chao , Liu Zheng Lin , Wang Jun , Dai Yan , Peng En Gao
Published: February 2012

The friction coefficient changes of water lubricated rubber bearing according to the temperature under different pressures are tested in the tribology test. The vibration data are collected and processed by B&K PULSE Analyzer Platform and the influences of temperature on the friction coefficient and vibration are analyzed. The results show that the influences of temperature on friction coefficient and vibration are immense; the friction coefficient increases along with temperature rising, especially when the bearing is at a low speed. And the vibration of the bearing is more serious.
Research of E-Government System Architecture Based on SOA-ESB
Authors: Huang Wei Li , Wang Fang
Published: February 2012

The current E-government system faced the problem of system heterogeneous and government information scattered. The traditional E-government system architecture can’t properly solve the problem of information islands because of its slow response, not easy to expand. This paper put forward system architecture based on SOA-ESB, and analyzed its principle. SOA (Service-Oriented Architecture) changed function into service, then the ESB (Enterprise Service Bus) provide the intelligent management and integrated to service, at the last, realize the electronic government affairs system integration and information sharing. The structure has characteristics of loose coupling, scalability and maintainability.
Formalization and Verification of Exception Handling Logic in Service-Oriented Software
Authors: Wu Qing
Published: February 2012

The dynamic and uncertainty in service-oriented software(SOS) running environment , together with the autonomy and loose coupling of service resources，lead to higher workload and more complexity of exception handling. Aiming to guarantee the completeness of design for exception handling logic in service- oriented software, this paper proposed a formal description method which and the corresponding integrated verification method for exception handling logic. This method can guide the design quickly and efficiently construct exception handling logic model in service-oriented software, and validate whether all exceptions which explicitly declare in service-oriented software are processed
Identification of Rotor System Noise Source Based on Sound Intensity Measurement
Authors: Li He , Li Ye , Geng Zhi Yuan , Wang Li Juan
Published: February 2012

In this paper, the noise of the rotor system is classified at first, and then the sound intensity experiment of the rotor system is conducted based on “two-microphone” method. Then the sound intensity contour maps were obtained from the measurement results. An investigation towards the relationship between the characteristics of contour maps and distributions of the rotor system on space was taken; the main noise sources of the engine were identified. The result provides guidelines for taking measures to reduce noise.
Chloride Penetration Resistance of Concrete Structures under Compressive Load
Authors: Jiang Fu Xiang , Wang Yu Tian , Zhao Tie Jun , Liu Liang Liang
Published: February 2012

The mechanism of concrete durability under uniaxial compressive load has been studied through chloride penetration experiments in this contribution. It has been found that there is a good corresponding relationship between chloride penetration resistance of concrete and the applied compressive stress level. With increasing of the applied compressive load, chloride penetration depth and content both decreased firstly. After the compressive load up to a critical level, they began to increase quickly. The apparent diffusion coefficient and chloride concentration at the surface also increase with the same rule. It is shown that chloride penetration of concrete is a complex process. So the effect of mechanical load should be considered as an important factor for prediction of service life of reinforced concrete structures in marine environment.
Dynamic Performance Optimization of Cylindrical Shell with Constrained Damping Layer Using Topology
Authors: Wang Ming Xu , Li Qi Zhi
Published: February 2012

Topology optimization of the constrained damping cylindrical shell for the maximized modal damping coefficient is studied in this paper. According to the first 3 orders modes, a novel topological optimization model where the volume is taken as the constraint function and the function of the modal damping coefficient as the target function is proposed and analyzed. The reasonable topology configuration was obtained for the damping structure. The results show that this method can be applied to solve the problem of optimization of the constrained damping cylindrical shell with the damping materials volume constrained. Numerical simulations are performed to very the effectiveness of the presented method.
Study on the Application of Modified Chitosan in Cherry Preservation
Authors: Li Yu Feng , Zhu Shi Fu , Zhu Xue Jun
Published: February 2012

To obtain a good Cherry preservative, the author prepared acetic acid Chitosan and metal ion complexes with solid-liquid reaction. Besides, the Cherry preservative was prepared by modified Chitosan materials. It was obtained that the optimal concentration of chitosen acetate for fresh cherries is 20g/l by studying effect of different concentrations of preservative on the storage of Cherry and its preservation time was 24 days. It also found that it owned better preservation effect with adding metal ion and Zn compound preservative had the best preservation performance among all experimental ion compound preservation. The experiment results showed that the preservative which prepared by Chitosan had excellence properties of extending Cherries storage periods、lowing the loss of Cherry fruit during storage、slowing the forming of Cherry soluble solids and the decreasing of titratable acid and vitamine C, but also reducing Cherry metabolism.
Capability Test and Vibration Analysis of Squeeze-Type Magnetorheologic Grease Damper
Authors: Jian Xiao Chun , Li Qian , Wang Xiao , Sheng Peng Cheng
Published: February 2012

Magnetorheological grease is a new smart magnetorheological material with non-sedimentation problem after magnetorheological fluid and elastomer. Squeeze-type damper is designed with small displacement; vibration characteristic tests of magnetorheological grease damper are presented, and the test-data is processed with matlab software. Under different current and frequency, the characteristic relationship of damping force-displacement and changes of the indicator diagram are studied experimentally. It comes to the maximum effective load current and the maximum effective vibration frequency of magnetorheologic grease damper, and damping characteristic by data fitting. Though analyzing the vibration reaction, vibration characteristics are obtained, it can also provide important support for MRG damper in development and vibration applications.
The Method of Random Vibration Signal Transformation from Frequency to Time Domain Based on FIR Digit Filter
Authors: Li Jie , Pang Jin Lu , Wang Xiao Yan , Lan Hai , Wang Zhi Yong
Published: February 2012

Based on finite unit impulse response, FIR digit filter is designed according as the given power spectral density (PSD) characteristics beforehand. By controlling the parameters of filter, amplitude-phase characteristics that can meet completely the preconditions and demand is obtained. And then white noise is inputted to filter, random vibration time signal is generated. Moreover, the method of parameters analysis of AR autoregressive model is used to estimate and validate power spectrum of the gotten random vibration time domain signal. The result shows that the accuracy and error of PSD between AR model and the given function are within the range of the permitted value. And random vibration time signal obtained by using the redesigned FIR filter can meet absolutely the precision demand beforehand in the simulation and test.
The Design of Shock Absorbers for Chemical Equipments
Authors: Yang Xin , Guo Xiao Yu , Ding Ming Liang
Published: February 2012

A low cost shock absorber easy to install and tune was designed to solve the vibration problem produced by the compressor in chemical process. By establishing the mathematical model of the dynamic shock absorption, the shock absorber characteristics were analyzed theoretically. The preliminary experiment was conducted on the testing platform to simulate the factory conditions. The shock absorber was then installed on the compressor for the field validation. Testing results agree well with theory and the shock absorber showed good damping performance.
Lathe Modal Parameters’ Identification and Verification Based on the GLOBAL Method
Authors: Zheng Li Li
Published: February 2012

Abstract:The dynamic characteristics of CY6140BT lathe were studied using the GLOBAL method. The damping rations and modal shapes of the main modal frequencies have been obtained. Correctness and reliability of the model were verified by comparative fitting results method. The results show that the working frequency fended off natural frequencies of the lathe. Which indicated that the lathe meets the design goals and work requirements.
A Mistuning Sensitivity Suppression Method of Bladed Disk
Authors: Li Yi Xuan , Shao Chuang , Zhang Zhi Jun
Published: February 2012

Based on the lumped parameter modal, the modal shape characteristics of the tuned free bladed disk and the random mistuned bladed disk was studied. It can be concluded that the vibration energy is evenly distributed in the tuned free system, but in the mistuned system, the modal localization dose exist. And the localization degree gets stronger while the mistuning strength is bigger .Then based on the finite element model of a bladed disk. The intentional mistuning technology’s role in reducing the sensitivity of the bladed disk to random mistuning was studied in this paper. The blades vibration response characteristics and the intentional mistuning technology was also studied through magnification factor for amplitude and localization factor. The result shows that the mistuning sensitivity level can be reduced by adding the quantity of intentional mistuning, and intentional mistuning has an important meaning to reduce the adverse effect of the random mistuning to the blades vibration response.
The Nonlinear Dynamic Response of Functionally Graded Material Flat Spherical Shells
Authors: Dai Yao , Hong Xiao , Liu Jun Feng , Zhang Lei
Published: February 2012

The response of functionally graded material (FGM) flat spherical shell under mechanical loading is studied using the method of lines. Based on the Kirchhoff straight normal hypothesis and Von Karman's geometrically nonlinear theory, the governing equations of the response of FGM flat spherical shells are obtained. A semi-analytical numerical method, i.e. the method of lines was introduced, and then the partial differential equations were transformed into ordinary differential ones. The effects of the material gradient parameters on the responses are discussed in details. The numerical results of flat spherical shells are given and compared with the finite element method ones.
Shape and Cross-Section Optimization of Spatial Grid Structures Using Genetic Algorithm
Authors: Xiao Jian Chun , Chen Jing , Li Qi , Xia Shao Quan
Published: February 2012

The optimization of the structures is difficult because the variables have different physical property or different quantitative attribute. The shape and cross-section optimization of spatial grid structures is performed by an improved genetic algorithm. The constraint conditions are composed of the structural deformation, the stability of the compressive members, the slender ratios, and etc. The treatment of the constraint conditions and the optimization function gives an unconstrained analytic function by adopting Lagrange multipliers. The method enhances the running efficiency of the genetic algorithm. The programme for structural optimization containing the mixed codes of continuous real variables, discontinuous real variables, and integer variables is coded by using MATLAB Toolbox functions for genetic algorithm. The analysis of examples shows that the programme is reliable, and the convergence of the algorithm is fast as well.
The Application of S7-200 PLC Reactive Compensation Device in Small Substation
Authors: Chu Qing He , Cao Wen Si , Nie Zhen
Published: February 2012

In the present rural power grid reconstruction project ,according to the problems of capacitor reactive power compensation in rural small substation. Take a small substation for instance, according to its operation and control method, set the criterion of the capacitor bank switching. A new high reliability, flexible reactive power compensation control device based on s7-200 PLC is designed. It plays an important role in improving the power supply , guaranteeing the quality of voltage, reducing the loss of rural power gid.
Optimal Piezoelectric Sensors and Actuators Deployment for Active Vibration Suppression of Satellite Antenna Reflector
Authors: Li Wen Bo , Li Xiao Ran , Zhao Zhi Gang , Wang You Yi , Zhao Yang
Published: February 2012

To solve the problem of active vibration control for satellite antenna reflector, which is weak damping and closely spaced modes, the optimal actuators/sensors deployment and controller designing need to be considered. Firstly, the optimal criterions of controllability and observability are designed according to the specificity of Gram Matrix eigenvalue in satellite antenna system equations. Secondly, based on the above criterions, piezoelectric materials (as sensors and actuators) and genetic algorithm are utilized to optimize the deployed locations of sensors and actuators. Finally, to suppress the vibration of satellite antenna reflector, a Linear Quadratic Gaussian (LQG) controller is designed under the impulse and white noise excitation respectively. The simulate results show the effectively deployed locations of sensors and actuators, and the correctness of designed LQG controller.
Research on Path Planning for Mobile Robot Based on Grid and Hybrid of GA/SA
Authors: Yang Wen Jun , Wang Huai Bin , Wang Jing Hui
Published: February 2012

Path planning is the kernel problem of the robot technology area. In this paper, the grid method is used to make environmental modeling, Since the Genetic Algorithm (GA) has its immanent limitations and the Simulated Annealing (SA) Algorithm has the advantages in some aspects, combined these two algorithms together just achieve the perfection. In view of this, a hybrid of GA and SA (GA-SA Hybrid) is proposed in this paper to solve path planning problem for mobile robot. The algorithm making the crossover and mutation probability adjusted adaptively and nonlinearly with the completion time, can avoid such disadvantages as premature convergence. The new algorithm has better capability of searching globally and locally. The simulation results demonstrate that the proposed algorithm is valid and effective.
Simulation Analysis of Traditional and L Type Macpherson Suspension Based on ADAMS/Car
Authors: Zhu Wei Hua , Shen Ying , Feng Jin Zhi
Published: February 2012

A Macpherson suspension model of a car was built based on ADAMS/ CAR. The kinematics discipline of the suspension was shown based on the general theory. Through the comparison of the simulation results of the two kinds of suspension, the L type Macpherson suspension in the wheel alignment parameter, steer angle and anti-lift/dive performance aspects is improved.
Research and Analysis of Offset Printing Press Paper-Feeding Mechanism
Authors: Ning Xin , Wei Jun Hong , Yang Bin Feng , Miao Qing Lin , Liu Cai Xia
Published: February 2012

According to the reverse design for the motion law of the follower in the swing upward conjugated cam paper-feeding mechanism, the technological requirements of positive design for paper-feeding mechanism are obtained. The quintic polynomial is presented to simulate the motion law of the paper-feeding tooth, and the mathematic model of the profile for conjugated cam is established. The profile of conjugated cam based on an actual sample is calculated, and the feasibility of this method is validated. It has some reference to design similar products.
Indentation Rolling Resistance of Conveyor Belts Based on Maxwell Model
Authors: Wang Fan Sheng
Published: February 2012

In order to obtain accurate results from computer simulation of the dynamic behavior of conveyor belts an accuracy description of the resistance forces, especially the indentation rolling resistance, is necessary. Since the indentation rolling resistance can account for the major part of the total rolling resistance, it is important to calculate it using a proper method. A new full two-dimensional semi-analytical method based on Maxwell model is developed to rigorously and efficiently simulate and solve the indentation rolling resistance of conveyor belts. In this method, the solution is expanded into a set of Fourier series, a so-called Maxwell model characterizing the viscoelastic properties for the belt cover material is used to relate Fourier coefficients, and a special boundary element is developed to handle the rolling contact boundary condition. A verification example is given to validate the methodology.
The Method of Tangent Modulus Factor for the Design of External Pressure Vessels
Authors: Chen Dan Yang , Tong Chang He , Liu Kang Lin
Published: February 2012

To solve the problems such as too much trial-and-error, limited material being involved in the graphs and calculation results being obviously influenced by artificial factors and errors of the graphs in the design of external pressure vessel according to current standard ASME Ⅷ-1, GB150 and EN13445, the mathematic expression of the graphic charts is examined, and a set of analytical equations and algorithms for the linear and nonlinear instability of external pressure vessel are established. The equation was applied to calculate the ultimate buckling pressure of cylinder and spherical shells. The algorithm here provided can not only avoid the shortages of current graphic analysis methods, but also be convenient for technicians to calculate, which could enrich and consummate the graphic charts in the current standards and be useful to the design of external pressure vessels to be made of new materials.
Knowledge Retrieval Strategy Research for Product Creative Design
Authors: Fan Fan , Li Wen Qiang , Li Yan
Published: February 2012

To make knowledge retrieval better aid designers for product creative design, according to the analysis of the characteristics of various stages of product design, the knowledge was classified. Combined with the characteristics of knowledge resources, aiming at new type, improving type and tracking type, this paper proposed three knowledge retrieval strategies, including function solution, technical solution, special solution, and formed a knowledge retrieval framework. According to the cognitive process of conceptual design, a knowledge retrieval application was discussed.
Optimal Design Method of Gear Molding
Authors: Chen Hong Jie
Published: February 2012

Gears are fundamental machine elements that are widely used in most types of machinery to transmit power and/or motion from one shaft to another at a constant angular velocity. They are used in many fields and under a wide range of conditions, from watches and instruments to the heaviest and most powerful machinery. A peculiar aspect of the considered optimization problem is the presence of many design constraints. To solve this special problem the original design variable domain has been modified according to the constraints prior to the global approximation step, to find the actual feasible design variable domain.
Technical and Economic Analysis of Polyvinyl Alcohol Fiber Ferrocement Mortar in Reinforcement Project
Authors: Bu Liang Tao , Wu Wei Hua
Published: February 2012

In accordance with the newly reinforcement technology of Polyvinyl Alcohol(PVA) fiber ferrocement mortar, this paper in the first place introduces the design principle and the excellent mechanical properties of the new method. Secondly, the paper summarizes the construction techniques and the points of controling in the implement process of this new technology. Finally, a comprehensive analysis of its economic advantages is presented.
Design and Application of Modern Educational System Used in Vocational Schools
Authors: Zhang Wei Guo , Tang Shi Long
Published: February 2012

Multimedia Computer Assisted Learning which is made up of the modern multimedia applications and network-support technology can offer vigorous and vivid learning and teaching environment. A decade ago, the use of computers in the language classroom was only concern to a number of specialists and experts; however, the developments of these things have resulted in the increased use of multimedia applications for education and the advent of multimedia usages. With the emergency of multimedia usages in vocational schools, the role of computers becomes an important issue meeting a large number of teachers all over the world.
Inversion of Infrared Nondestructive Testing with Evolution Algorithm
Authors: Huang Yong
Published: February 2012

The technology of infrared nondestructive testing is an important method to detect where the defect is, and its order of severity. In pulse heating stage, obviously there is also temperature difference between defect area and no defect area. So this paper uses temperature difference between defect area and no defect area in the pulse heating stage, according to 1-D transient heat conduction model of finite thickness defect slab under Neumann boundary condition and heat conduction equation, builds a least-square formula to inverse the depth of defect area in the defect slab with evolution algorithm. The results show that this evolutionary algorithm is reliable, and it has only small errors, and is especially suitable for detecting large defect area. To do the more accurate detection, it still needs to find a new data processing method for infrared nondestructive testing from starting with three-dimensional heat conduction inverse problem.
Grinding Process Parameters Optimization and Surface Performance Analysis of Spiral Bevel Gear Based on the Orthogonal Test
Authors: Ming Xing Zu , Yan Hong Zhi , He Guo Qi , Kong Xiang Han
Published: February 2012

Based on the experimental conditions of generation grinding of spiral bevel gear, the grinding orthogonal test design of L16(45) is made, and the results of grinding orthogonal test are obtained. On this basis, the range and variance analyses are carried out by using an integrated balance method, and the optimizing configuration of grinding process parameters of spiral bevel gear is obtained. The test regression models of three grinding evaluating indicators of spiral bevel gear, such as the grinding surface roughness Ra, metamorphic layer depth h and removal rate Zw, are set up by using a method of multivariate nonlinear least square. The maximal absolute value of relative error between computing values and testing ones is 18.41 percent by test validation, and this shows that the regression models are more effective. Through the test optimization of grinding surface performance, the value of grinding surface roughness Ra is more less 0.1μm than one of the normal grinding process, and other comprehensive performances are better. The pre-control measures of grinding process optimization of spiral bevel gear are also put forward. These provide a basis for the improvement of grinding surface quality of spiral bevel gear.
Experimental Study on Structural System of Throttle Multi-Hole Orifices in Refrigeration Plant
Authors: Zhao Tian Yi , Zhang Ji Li , Ma Liang Dong
Published: February 2012

Multi-hole orifices (MOs) is a promising throttle device applying in refrigeration system or plant.The geometric description of multi-hole orifices (MOs) is more complex than single-hole orifices (SOs). The flow control characteristics and structural system of MOs need to be investigated. This paper presents a comprehensive geometric description for MOs by a series of throttle experiments. This paper first defines a comprehensive set of geometric architectures involving orifice arrangement criteria and three geometric parameters, then investigates the effect of various geometric features on the pressure loss characteristics of MOs by throttle tests , finally develops practical models to evaluate the pressure loss coefficient of MOs. The presented structural system of MOs including orifice arrangement criteria, geometric parameters and throttle models, provides convenient conditions for structural design and manufacturing for MOs.
The Mechanism of PEO Process on Al–Si Alloys in Zirconate Solution
Authors: Wang Ping , Liu Dao Xin , Li Jian Ping , Guo Yong Chun , Yang Zhong
Published: February 2012

Zirconia coating was produced on Al-Si alloys by plasma electrolytic oxidation (PEO). The alkaline electrolyte containing Zr(OH)4 powders was used. The composition and structure of the coating were investigated by SEM and XRD. The results show that in the initial stages of oxidation the growth of coating belongs to the stage of anodic oxidation controlled by electrochemical polarization. The growth of coating is mainly outward growth and the growth rate is faster. With elongated treated time and increased thickness of the coating, the growth of coating is mainly ingrowth. In contrast with the stage of anodization, the growth rate of plasma electrolytic oxidation is slower than anodization. The coating consists of t-ZrO2, m-ZrO2, α-Al2O3 and γ-Al2O3.T-ZrO2 is the main phase and distributes in outer layer of the coating, however, α-Al2O3 appears in inner layer of the coating. Many micro-particles appear on the coating surface with dimension of 1-2μm.. In the process of plasma electrolytic oxidation, Zr(OH)4 powders move and deposit on the mouth of plasma discharge channel under the effect of electric field force, then it is transformed to ZrO2 by the high temperature of plasma discharge.
Hardware System Design Research on Operation Monitoring System of Hanjiatuo Yangtze River Bridge
Authors: Yan Peng , Shan De Shan , Li Qiao
Published: February 2012

The main research results of operation monitoring hardware system design of Hanjiatuo Yangtze River Bridge are introduced. Firstly, the content and method of the system are illustrated, and then, overall composition and functions are introduced. The system consists of four subsystems, including sensor system, real time monitoring system, electric power system and grounding system, which are described in detail, and the importance of the last two systems are emphasized.
Design of a Resonant Accelerometer
Authors: Li Jing , Fan Shang Chun , Guo Zhan She
Published: February 2012

A resonant accelerometer was designed in order to overcome low output precision characteristics of the sensors which were tested with analog signals. This accelerator has the advantages of good repeatability, high resolution and excellent stability. Relationship between linear acceleration and resonant frequency of the sensing unit was deduced and the finite element method was used to simulate the correctness of the design. The theoretical and simulation results are 2984.47 and 2971.27 respectively without acceleration applied on this sensor. When 1g acceleration applied on this sensor, the theoretical and simulation results are 2970.18 and 2951.78 . The relative errors are 0.44% and 0.62% respectively. Finally, the fabricated sensor was tested, and the measured resonant frequency is 3022.55 with a relative error 1.26%, and we give out the possible reasons for this error. The results indicate that this design is feasible.
Optimal Sensor Placement for CNC Machine Tools
Authors: Bai Xiang He , Mao Xin Yong , Liu Hong Qi , Li Hai Zhou , Li Bin
Published: February 2012

Proper pretest planning is a vital component of any successful CNC machine tools’ vibration test. An extremely important part of the pretest exercise is the placement of sensors. In general, the placement of sensors of CNC is uniform distribution, which depends on test engineer’s experience. This paper considers the problem of locating sensors on the CNC machine tools with the aim of maximizing the data information so that structural dynamic behavior of CNC machine tools can be fully characterized. We present a new technique, based upon Effective Independence (EfI) and Shannon’s Sampling Theorem, that can meet test accuracy requirements and the visualization of the mode shapes. The technique is applied on XHK5140 CNC machine tool successfully
Analysis of the Development of Xinjiang Electronic Government
Authors: Abuduaini Abudureheman , Sun Bao Wen
Published: February 2012

It is important to conduct a regular study on the status and the needs of the users’ demand， along with the development of Xinjiang electronic government (E-government). Literature reviews show that researches on Chinese E-government tend to focus on the technical aspects. However, there is little research focused on the E-government users, especially of Xinjiang. This article provides a better scope of knowledge on the Xinjiang E-government users and their demand to use and benefit from E-government information and services.
Based on the CAD / CAE Technology Product Simulation Design System
Authors: Zhao Yu
Published: February 2012

The paper analyze the existing CAD / CAE methods and differences in product design requirements. It points out that firstly, performance analysis and design is the core of mechanical product design; Secondly, integrated CAD / CAE technology, product design should be based on CAE-centric the design process. It proposes simulation-based design methods and constructs a performance-oriented product design system.
Impact Analysis of Different Cable Types on Saddle-Shaped Cable-Net in Construction Process
Authors: Liu Zhan Sheng , Zhang Ran
Published: February 2012

Cable is widely used in the actual project of prestressed steel structure for its mechanical properties can be fully used. Saddle-shaped cable net is a new type of large-span prestressed structure, but there is little study on the impact of different cable types on the mechanical properties of saddle-shaped cable net during the construction. In order to meet the thought of integration of design and construction, a finite element model of saddle-shaped cable net has been established. The four types of cables such as semi-parallel steel tendon cable, steel wire rope cable, steel strand cable and full-locked coil rope are chosen. The impact on mechanical properties of the structure was analyzed by different cable types.
Research on Improved Genetic Algorithm Solving Flexible Job-Shop Problem
Authors: Li Min Shuo , Yao Ming Hai
Published: February 2012

Based on the analyzing of the characteristic of the flexible job-shop scheduling problem (FJSP), we proposed an improved genetic algorithm. To consider the max finish-time, total delay-time, keeping workload balance among the machines, a new selection operator is proposed, which combines random method, proportion-based selection method with elitist retention policy. The improved genetic algorithm using the proposed selection operator is tested on some standard instances. The experimental results validate the effectiveness of the proposed algorithm.
Research and Design of Adaptive Noise Cancellation Based on Particle Swarm Optimization Algorithm
Authors: Zhang Jie , Jiang Shi Qi
Published: February 2012

Particle swarm optimization (PSO) is a kind of evolutionary computation technology which simulates the behavior of biological species. The essence of adaptive noise cancellation (ANC) is adjust the weight value of filter based on the input signals, the LMS algorithm is commonly used in this system, However, the convergence behavior and maladjustment of the LMS algorithm is seriously affected by the step-size μ, and the optimum value of μ cannot be determined easily, In this paper, Particle Swarm Optimization with linear decreasing inertia weight is proposed to solve the filter problem instead of LMS, taking the FIR filter of ANC as example, the simulation shows that ANC based on the PSO algorithm is better than classic ANC based on the LMS algorithm, and it gives the satisfactory results.
Design and Simulation of 3D Layout for MID Based on Open CASCADE
Authors: Zhuo Yong , Wu Yan Jun , Peng Juan
Published: February 2012

Molded Interconnect Devices (MID) is an innovative technology which abandoned the conventional board and integrates the mechanical and electronic functions directly on materials. Due to the complex process, the existing MCAD and ECAD do not meet the requirements of MID, so an MID prototype system for design and simulation of 3D layout based on Open CASCADE has been developed in this paper. Through studying on the algorithm of 3D automatic routing, realized the functions of placement of 3D electronic components and 3D automatic routing. Also, simulation for 3D laser direct structuring and placement of electronic components with a six-axis robot has come true after studying manufacturing process of MID.
The Influence of Rare Earth Oxide on the Structure and Properties of AgSnO2 Electrical Contact Materials
Authors: Zheng Ji , Li Song Lin , Guo Jing
Published: February 2012

In order to develop new electrical contact materials with better properties, small amounts of rare earth (RE) oxides were selected as additions into AgSnO2-based composites. The effects of different RE oxide additions with different content in the matrix on the microstructure of AgSnO2, were investigated. In general, the resulting RE oxide-doped materials are found to have better performances than their original ones. Results indicate that the newly developed AgSnO2/La2O3 materials in this paper are leading candidates for environmentally friendly electrical devices and RE oxides would play an important role in improving performance of AgSnO2.
The Influence of Blind-Hole Depth and Bore to Strain Energy Relief Coefficients-a Case Study
Authors: Liu Xiao Hong , Guo Chang Qing
Published: February 2012

In order to improve measurement accuracy and for choosing the best ratio of hole depth to bore (h/d), a model based on 16Mn was setup for studying the influence of different hole depth h and bore d to the coefficients with finite element method (FEM). The stress and strain on hole edge was simulated and the influence of h/d to the strain relief coefficient A, B were studied. By applying different loads, the relation of A, B vs. stress σ was studied under the conditions of σ=1/3σs. The results showed that more accurate coefficients were achieved when h/d was set to 1.25.
The Compensation of Automatic Control System Based on MATLAB
Authors: Gou Jian Feng , Jiang Yan
Published: February 2012

MATLAB is a visualization of facing the scientific computing outstanding scientific and technological application software, it can make the abstract of pure theoretical study way evolved into the theory and application in the closely combining way, It takes the scientific computing, the visualization and programming focus on a convenient use environment, more easy to grasp. This paper mainly introduces the design of the user interface by using MATLAB. User use the interface, inputting system open-loop transfer function simply, namely can easily finish system analysis and series compensation. not only can avoid trival manual calculation and difficult manual drawing, improve the design accuracy, but also greatly shortened the design time. There has practical application value.
Research on Mine Gas Monitoring System Based on Multi Sensor Data Fusion
Authors: Zi Xing Jian , Wang Hai Jun
Published: February 2012

At present the majority of mine gas monitoring systems have the following shortcomings: inaccuracy in measuring, poor in real-time and anti-interference. This paper presents a two-level-fusion design for sensor system information by patch estimation theory and BP neural network ,and the simulation have been carried out with many mines’ measured data .The results show that the method can greatly improve the accuracy and reliability of measurement, and can make a real-time objective evaluation to the mine safety situation.
The Finite Element Analysis to the Reformation Structure of 75 Ton Iron Ladle Based on ANSYS-Workbench
Authors: Li Shan , Wang Yu Qi , Gao Bo , Wang Lei
Published: February 2012

According to the factual demand of produce, some corporation wants to enlarge the capacity of the idle from 65t to 75t. This paper aims at the changing ladle which the capacity is 75t. It makes research to the iron ladle's promotion process and stress analysis. This paper uses ANSYS-Workbench software to make the finite element analysis of the iron ladle and extracts the largest stress, strain and the location. Then this paper analyses whether the changing ladle can be fit for the intensity demand or not so that it could provide the important theory gist to the corporation
Finite Element Analysis of Dual-Frequency Vibrating Screen
Authors: Hou Yong Jun , Fang Pan , Zeng Lian
Published: February 2012

In order to study the stress distribution of dual-frequency vibrating screen and ensure the screen box has sufficient strength and longevity, a finite element model of dual-frequency vibrating screen was built, and the stress, modes and fatigue life of the screen box were analyzed. The results indicate that, the stress concentration appears at the contacting parts between the crossbeam and the stiffener of motor seat, the crossbeam, L-type stiffening plate, baffle of material added and screen box. The middle of crossbeam and the L-type stiffening plate are weaker parts of fatigue, they are easily fatigue failure under high frequency vibration.
Reverse 3 D Garment Model Reconstruction Technology Research
Authors: Lin Nan , Lin Jing , Lin Ni
Published: February 2012

Reverse Engineering technology has became a widely applied technology, but it has never been used in the field of Clothing Design Engineering .This paper aims to explore how to constructing the three-dimensional entity model of clothing by Geomagic software, then introduce the files into Freeform software in order to redesign clothing. The matters need attention during the Point cloud select, t data processing and model reconstruction are described in detail. In addition, the paper discusses the best solution of importing into Freeform software in different situation, also discusses the processing procedure after importing.
Study on Precision Evaluation of Reverse Modeling for Mechanical Parts
Authors: Tu Qun Zhang , Zhao Jian Xun , Yan Jun , Dai Jv Ying
Published: February 2012

Precision evaluation for the reconstructed model of mechanical parts is an important content used to measure the success or failure of reverse engineering. The various error sources are analyzed detailedly, which are generated in the entire process of reverse modeling for mechanical parts and some methods of obtaining the values of errors are put forward. At the end, taking a piece for an example, the summation of all the errors is calculated by applying different software and the result satisfies the pre-established precision requirement.
Practice on No Pillar Simultaneous Extraction of Coal and Gas in Deep Mine
Authors: Zheng Xi Gui , Zhang Nong , Zhang Zhi Yi
Published: February 2012

Based on four typical mining condition, such as implementation gob-side entry retaining under sandstone roof, long length and long time gob-side entry retaining, implementation gob-side entry retaining under mudstone roof and implementation gob-side entry retaining at depth of more than 900 m, this paper analysis the roadway maintenance-control in no pillar simultaneous extraction of coal and gas engineering, research on the roadway maintenance-control technology during exploitation and before mining, further study typical convergence characteristics of gob-side entry retaining after mining, drew in application of no pillar simultaneous extraction of coal and gas in deep mine, proposed evaluation about the project current existing problems and development trends.
Precision Analysis of Reconstructed Aluminum Alloy Handle
Authors: Jiang Hai Lin
Published: February 2012

In order to carry out the error analyses of the aluminum alloy in reverse engineering, Mastercam was used to create three-dimensional (3D) parametric solid models and automatically generate NC program files. By using the generated NC program, a simulating is processed on a milling machine. The surface of the obtained product 1 was immediately scanned by a laser scanner. Using the obtained results from the laser scanner, the three-dimensional models were created in Geomagic Studio. Reanalysis of the three dimensional models, product 2 can be obtained. Finally, Error analysis was carried out by comparing the 3D scan data with the original design models. The current research demonstrates that error analysis by the present method is feasible. However, since aluminum was selected as the processing material, the scanned data is not satisfactory; contrast error is greater after reverse engineering.
3D Model Reconstruction of the Broken Aeroengine Blade Based on Multi-Scale Genetic Algorithm
Authors: Wang Hao , Cai Zhi Jun , Wang Li Wen
Published: February 2012

This paper made the 3D model reconstruction of the CFM56-5B turban blade. First, collected rough points cloud data by using visual measuring equipment. Then, smoothed and filtered the point cloud data, took the rational simplification, finished pre-processing the point cloud data. Finally, multi-scale genetic algorithm was used for fitting the edge of turban blade, and reconstructed the 3D digital model. The results proved that this method improved smoothness of the model, and reduced time and cost of modeling and machining.