bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of the Varying Normal Force on the Stick Slip Motion of Systems with Friction
Authors: Liu Li Lan
Published: February 2012

In most cases, the normal force applied to mechanical systems with friction is supposed to be constant for convenience. However, through experiments, normal vibration has been proved to have an effect on the stability of mechanical systems. Aiming at uncover the effects of the varying normal force on the stick slip motion, a belt driven system with LuGre friction is investigated. The driving velocity is considered as the critical parameter for stick slip occurrence. By means of the Jacobian matrix and the Taylor expansion, the critical driving velocity is achieved analytically as a function of frequency and acceleration of the varying normal force. In addition, the influence of the varying normal force on the size of limit cycles is also studied numerically. Results show that the variation of the applied normal force has an obviously effect on the stability of mechanical systems, and it should not be ignored in the structure design and the stability analysis for high precision mechanical systems.
The Tribological Behaviour of Precipitation-Hardening Stainless Steel 0Cr17Ni4Cu4Nb against 30CrMnSiA Steel under Sliding Condition
Authors: Tan Zhi Hai , Guo Qiang , Li Xia , Zhao Zheng Ping
Published: February 2012

The tribological behaviour of precipitation-hardening stainless steel 0Cr17Ni4Cu4Nb against 30CrMnSiA steel under sliding condition was tested using the M2000A model wear tester. The surface roughness, hardness and load under the dry or grease lubricated conditions were studied. It indicated that the volume wear, mass wear, wear rate and friction coefficient were all large, and the main wear mechanism was the adhesive wear under the dry friction. The grease lubrication can effectively reduce the volume wear and friction coefficient, and enhance the wear resistance properties of 0Cr17Ni4Cu4Nb. The tribological properties were the best when the surface roughness was 0.8μm under the grease lubricated friction. Meanwhile the volume wear was also small when its hardness was low. The hardness was higher and the friction coefficient was more stable after the heat treatment on 0Cr17Ni4Cu4Nb. The volume wear and friction coefficient were both increased with the increasing of the loads under the grease lubricated friction.
Broadband Unidirectional Electromagnetic Mode along an Arbitrary Surface
Authors: Tao Ke Yu
Published: February 2012

Based on coordinate transformation, we extend the theory of unidirectional surface mode at a plane interface to a more general case of arbitrary boundary. We provide direct simulations to prove the validity of extension. Because it depends only on the signs of off-diagonal elements in the tensor of permittivity (for TM mode) or permeability (for TE mode), the unidirectionality is robust in a wide range of frequency. Moreover, this kind of surface mode is fairly robust with smoothly changing surface. These properties are very useful to design compact nonreciprocal component with wide range of operating frequency in various cases, such as broadband isolators and circulators.
The Brand Awareness and the Brand Image Enhancement of Chinese Health Food
Authors: Yang Xue Xin
Published: February 2012

The main problems in Chinese health food industry are the anomaly management, poor quality, and illusive advertisements at present. In order to regulate the quality and safety management of the health-care food，improve the brand image and reputation, enhance consumer trust and the competition in the international market, some suggestions are offered, which are band orientation, science addition and band innovation in order to ensure to execute brand strategy of health food fluently.
Internal Unsteady Flow Induced Vibration in Centrifugal Pump
Authors: Shao Chun Lei , Zhou Jian Feng , Gu Bo Qin
Published: February 2012

Centrifugal pump is an important installation for fluid delivery. The research on the unsteady flow in centrifugal pump is very meaningful to reducing vibration. The methods of numerical simulation were discussed. The unsteady pressure field was simulated by using Sliding Mesh (SM) model provided by Fluent. The time domain data for pressure were obtained at the monitoring points, and they were translated to frequency domain data by using FFT. The results show that the static pressure at the impeller outlet increases along the direction of impeller rotation from the position near the volute tongue. The pressure disturbance is relatively large near the volute tongue. The pressure disturbance at the impeller inlet is smaller than that at the impeller outlet. The volute tongue plays a key role in the flow induced vibration. The position, where the blade is in closest proximity to the head of volute tongue, is the turning point in the pressure fluctuation cycle. The maximum peak value of pressure fluctuation appears at 145Hz, which is the blade frequency. Other pressure peaks are evident at multiples of the blade frequency. Also the pressure amplitude decreases with increasing frequency.
Identification of Three Dimension Vibration System Based on L-M Algorithm with Learning Rate
Authors: Liu Shao Man , Wu Zhao Lin
Published: February 2012

The vibration control platform is designed involving periodical micro- vibration in Three Dimension (3D) scanning system. The system is identified utilizing neural network based on Levenberg - Marquardt (L-M) algorithm. The L-M algorithm is the combination of the steepest decent algorithm with the Gauss - Newton algorithm so that it has the faster speed of convergence and higher approach accuracy. Compared with the rational BP, the simulation result showed the LM algorithm with learning rate speed up learning process, reduce training time with improve identification accuracy greatly. The identification effect is good.
Simulation of Multi-Channel Active Noise Control Based on Dynamic Neural Network
Authors: Wang Bing , Zi Ke Ming
Published: February 2012

The stability of the controller based on traditional adaptive active noise control(AANC) adaptive algorithms is not sufficient because of the time-varying parameters and essential nonlinear property of the active noise control system. The results show that the performance of the controller using multi-channel dynamic neural network algorithm which possess favorable silencing effect and stability is superior to the one using AANC.
Cause Analysis and Improvement of the Oil-Film Oscillation of the Centrifugal Compressor
Authors: Chen Hong Wei , Wang Rong Jie
Published: February 2012

The paper starts from the reasons of the Centrifugal Compressor’s oil-film oscillation in one factory of Longyan, and thinks oil-film oscillation is the typical one of faults of the high-speed glide bearing and happens at about two times of the critical speed. It also summarizes the features of the oil-film oscillation, analyzes the reason, and finds out that the problem is related to the load, critical speed, the relative eccentricity of the bearing, lubricating oil and the bearing’s load amount. Finally it puts forward HHT detecting methods which can accurately find the problem earlier, and proposes improvement measures which have been proved simple, convenient, and practical after half year’s experiment.
Research on Blade with Particle Dampers
Authors: Xia Zhao Wang , Fang Yuan Yuan
Published: February 2012

The performance of particle damper is highly nonlinear whose energy dissipation is derived from a combination of mechanisms including plastic collisions, friction, and momentum transfer between particles. Particle damper can be applied in extreme temperature environments. In this paper, an investigation on particle damper is performed analytically and experimentally. A simulation algorithm and results of simulative studies aimed at understanding the effects of parameters of particle damper are presented. Parameters considered include damper geometry, particle material and particle size.
Feature Extraction of AE Signal in Offshore Platform Tubular Joints Crack Propagation Based on Wavelet Coefficient Energy Theory
Authors: Liu Gui Jie , Xu Meng , Zhu Shao Feng , Jiang Rui Lin
Published: February 2012

To identify the fatigue crack propagation of tubular joints in the offshore platform, we applied the wavelet coefficient energy theory to monitor and analyze the acoustic emission(AE) signal of marine structures with typical fatigue crack propagation. Based on typical tubular joints model fracture experiments of the offshore platforms, we successfully extracted the characteristics of AE signals during crack propagation. Further analysis results demonstrated that the elastic wave generated by the crack extension was superimposed by a variety of high frequency signals, and it changed with the evaluation of crack. The variation of wavelet coefficient energy and the change of crack propagation state showed a strong correlation. Thus the characteristics of AE signals can be used to identify different stages of crack propagation accurately, intuitively, and clearly, so as to label the development process of crack.
Modal Analysis of Seat Frame of Bulldozer's Cab Based on Finite Element Method
Authors: Yao You Liang , Zuo Cui Peng , Li Cui Lan , Wang Li , Li Hao
Published: February 2012

As the seat frame is an essential structure of bulldozer's cab, dynamic characteristics of the structure are particularly important. The finite element model of the seat frame was established by CATIA software, and then modal analysis was carried out in absolute freeness. After investigating inherent frequency and vibration mode of several typical modes seriously, dynamic characteristics of the frame were clear. Weak links of the structure were obtained on the basis of analysis result, and structure improvement was conducted. Finally, the comparison and analysis was carried out between the unmodified seat frame and the modified one, the result shows that the dynamic characteristic of seat frame is optimized.
Parametric Design of Parts in an Integrated Simulation System Based on Asynchronous Mode of Pro/TOOLKIT
Authors: Zhao Gang Lian , Jiang Yi , Chen Yu Jun , Ma Yan Li
Published: February 2012

Based on software Pro/ENGINEER and Visual C++ 2005，sub-module of parametric design of assembly with wide universality was done by using Pro/TOOLKIT, and the design procedure was introduced in details. Assembly relation of sub-components is transformed into binary tree structure to store and search parts, and the assembly relation is displayed by CTreeCtrl control. The corresponding parts can be quickly found in the binary tree. Engineering drawing was automatically generated and displayed by ProductView after loading a part, and in this way dimensions of different parts can be modified according to engineering drawing in asynchronous mode. The sub-module can meet the needs of parametric design of parts in the integrated simulation system.
Experimental Study of Anti-Jamming Problem for Frequency Control System
Authors: Chen Yan Yan , Zhang Jian Cheng
Published: February 2012

This article studies about anti-jamming problem for frequency control system with three experimental methods which are magnetic shielding, grounding and filtering. The results demonstrate that filtering is the most evident anti-interference. the interference of frequency converter is independent with the signal; Shielding on both ends of the grounding is better than single ended grounding. All of the conclusions will be used for reference.
Application of Robust Design Approach for Design Parameterization in Kansei Engineering
Authors: Sutono Sugoro Bhakti , Taha Zahari , Abdul Rashid Salwa Hanim , Aoyama Hideki , Subagyo Subagyo
Published: February 2012

Nowadays, consumers have become more selective in choosing products not only deciding based on its functionality and its value but also on its aesthetic and emotional value. Aesthetic and emotional values have thus become important aspects in the success of a product in a competitive market. Consequently, recognizing the primary parameters used to generate combinative product shape which has the ability to evoke a particular emotion should be given strong consideration. This paper describes the application of robust design approach which allows the designer to determine the optimal design parameters to obtain form impression evoked by a product shape feature. A Taguchi’s orthogonal array method is applied to design the experiment and is analyzed to obtain the optimal parameters for each factor. ANOVA is then employed to identify the most significant factors. A Taguchi’s L18orthogonal array was adopted for an experiment on the design of an office chair. The case study contains six three-level factors, and 18 different combinative design samples created from shape parameters. The results of the experiment shows that it is possible to create a design support system that can facilitates the designer in the creative process by suggesting shape parameters relating to a specific form impression.
Study on Product Virtual Design for the Diesel Engine Combustion System
Authors: Liu Yong Feng , Zhu Ai Hua , Yang Jian Wei , Tian Hong Sen
Published: February 2012

To carry out product virtual design for diesel engine combustion system, the top-down method is used. The diesel engine combustion system is designed and each part is modeled in Pro/E. Pro/E is a solid modeler and this offers considerable advantage for solid model creation. Normally, the geometry is first sketched in 2-D and then extruded in the third direction to generate a 3-D model. In Pro/E, it is important to first create the base geometry. The base geometry is that captures the design intent of the part to be modeled. This base geometry can be created using either the EXTRUDE or the REVOLVE options. Once this base geometry has been created, additional features like holes, rounds, chamfers, fillets, ribs, etc can be added in the finishing stages of the part creation. The center of the bowl does not coincide with the center of the cylinder due to the presence of valve pockets. The obvious advantage of this configuration is that is gives the true geometry of the piston and the connecting rod ports can be accommodated when the piston is at the top dead center.
Business Logistics Outsourcing Risk and Management
Authors: Xiao Xi Sheng
Published: February 2012

Logistics outsourcing as a form of outsourcing, are increasingly welcomed by the enterprises in developed countries, which has become the strategic orientation of many enterprise logistics mode. However, the development of business logistics outsourcing in China is far from that in developed countries, mechanism factors restricting the development of business logistics outsourcing of China has its characteristic, for this, this article analyses the advantages and risks of logistics outsourcing, and proposed prevention countermeasures of enterprise logistics outsourcing in China.
Study on Modular Design in The Anchor and Windlass
Authors: Tang Wen Xian , Wu Chun Yan , Wang Fei , Huang Qiu Yun , Ma Bao
Published: February 2012

The modular design offers insurement for effective development of serial and diversify products, and hence to satisfy the demand of the market. Through researching the modular design in function and structure, the process schem of modular design characterizing anchor and windlass products was proposed. By studying the module partition method of function and structure, the anchor and windlass was classified as modules of power, modules of driving and changing, modules of control, modules of performing. Based on the program language and three-dimensional software, the computer-aided modular design system for anchor and windlass was established, which satisfies the parametric design for anchor and windlass.
FEA on the Roller System of Rolling Mill
Authors: Wei Yan Gang , Wang Yan Tao , Han Chang Tao
Published: February 2012

According to contact mechanics, the contact regions between the rollers and the steel plate, and then the boundary conditions and FEA model of the roller system of rolling mill are determined reasonably considering the characteristic of the structure and loads. The simulations of the system under different values of loads have been done using FEA and main results are introduced in the paper. The work of this paper offers a reference to calculate the strength or work life of parts in the system and a basis to analyze the roller bearings in the system with 3D FEA in detail.
Synthesis of Diethyl Carbonate from Ethyl Carbamate and Ethanol Catalyzed by ZnO-Fe2O3 from Zn/Fe Hydrotalcite-Like Compounds
Authors: Wang Deng Feng , Zhang Xue Lan
Published: February 2012

ZnO-Fe2O3 catalysts were prepared by thermal decomposition of layered double hydroxides containing zinc and iron within the brucite-like layers and carbonate as the interlayer anion, then the hydrotalcite precursor and mixed oxides were characterized by ICP, XRD and N2 adsorption/desorption techniques. XRD patterns showed that both ZnO and ZnFe2O4 phases appeared for the mixed oxides and their proportion and crystalline degrees depended on the heat treatment temperature. Furthermore, these mixed oxides were tested for the diethyl carbonate (DEC) synthesis from ethyl carbamate and ethanol. More important, the DEC yield could reach to about 32.3% in the bacth reactor under the optimal reactions.
Force/Position Cooperative Control for 6-DOF Parallel Platform
Authors: Li Hai Hai , Hao Kuang Rong , Ding Yong Sheng
Published: February 2012

when the robot works in an uncertain environment, the interaction force can affect the control system performance and damage control targets, so this paper proposed a Generalized Predictive Control (GPC) algorithm, using multi-sensor fusion with force and position sensors to complete force/position synergic control. The control strategy can guarantee the tracking accuracy of the position and force and make the end-effector move along the constraint surface with a desired contact force. Simulation results of 6-DOF parallel platform reveal the high accuracy of position and force tracking control, meanwhile the robot has strong ability to adapt uncertain environments.
An Efficient Parameter Optimization Approach Based on Real-Coded Genetic Algorithm
Authors: Chen Zhi Qiang
Published: February 2012

In this paper, we present an efficient parameter optimization approach based on real-coded genetic algorithm, which breeds selectively offspring based on difference between individuals. A new crossover operator is proposed which generates offspring around the center of mass of parents with Laplace distribution. A set of 14 test problems available in the global optimization literature is used to evaluate the performance of proposed genetic algorithm. The comparative study shows that the proposed genetic algorithm performs quite well for parameter optimization problem.
Design on an Intelligent Self-Locking System of Clutch for Bus
Authors: Zhang Qiong , Tian Xue Ying , Zhang Shuo , Wu Chu Na , Xu Li Wen
Published: February 2012

An intelligent self-locking system of clutch which uses MC9S12XS128MAL as the main microcontroller was designed in this research. The system detects whether the door is completely closed or not by the position switch installed in the door rail to achieve control of the clutch pedal. When the door of bus is not completely closed, the driver cannot push down the clutch pedal to drive the bus. Doing that can we achieve automotive driver assistance and further improve driving safety. This paper also discusses the design of the system’s hardware circuitry and procedures.
Finite Element Analysis and Optimization of Power-Assisted Structure of Wearable Human Lower Limb Exoskeleton
Authors: Liu Fang , Cheng Wen Ming , Zhao Nan
Published: February 2012

In this study, a multi-shape object-oriented human motion model is built using HumanCAD simulation platform to simulate the movement of a particular action; taking structural load-bearing characteristics as the objective function, combined with ergonomic parameters of the constraints, using particle swarm optimization, the study has made an optimized simulation of lower limb three-hinge power-assisted structure for multi-object under multiple constraints and established solid models with Solidworks based on the optimization; the study has realized data exchange between the analysis software of Ansys and the solid models, built a multi-rod coupling analysis model, made the strength calculation and modal analysis, proposed optimization strategies to make improvement, and provided parameters for structural dynamics optimization design.
Research of Accurate NURBS Curve Fitting Based on Genetic Algorithm
Authors: Zhang Yin Juan , Wang Yong Ke
Published: February 2012

In order to control the curve modality of non-uniform rational B-spline accurately, the genetic algorithm is presented to the manipulative precision of NURBS curve fitting. The manipulative precision of curve fitting and the overall side-by-side search ability of genetic algorithm were researched; the excellent unit is founded in the field of weight coefficient. The precision result and the curve figure of curve fitting using the excellent weight coefficient are better. The examples of data fitting are given to show that the curves fitting used genetic algorithms are better in approximation. The precision result of curve fitting is improved. The global optimal search of genetic algorithm provides a reliable tool for scientific data processing.
Research on High-Precision Measurement of Position and Orientation of 6-DOF Parallel Robot Based on Stereo Vision and Positional Solution
Authors: Wang Hai Tao , Hao Kuang Rong , Ding Yong Sheng
Published: February 2012

In the paper, both stereo vision and positional solution are used to measure the position and orientation of 6-DOF parallel robot. Firstly, moving platform is segmented from the background based on temporal and spatial union algorithm, rough position and orientation of moving platform are obtained by feature point extraction and match; secondly, rough length of supported leg is calculated according to rough position and orientation of moving platform; finally, accurate position and orientation of parallel robot are calculated using both actual length measured by sensors and positional solution. Experiment results demonstrate that the position and orientation calculated by the above algorithm have high accuracy.
Tangent Stiffness Matrix of Single-Layer Reticulated Shell’s Members with Rigid Ends
Authors: Wang Fan , Wang Xing
Published: February 2012

In the paper, the axial stiffness and bending stiffness of single-layer reticulated shell’s joint are considering together, non-linear beam-column element with rigid springs and rigid ends is taken as the analysis model of members of single-layer reticulated shell, a tangent stiffness matrix of members of single-layer reticulated shell considering joint’s stiffness is derived on the basis of the beam-column theory. In this matrix, not only coupling effects of bending in two axes but also joint’s stiffness and joint’s size are considered, not only the effect of axial force on bending but also the effect of axial force on torsion are considered. All higher order terms in the displacement function are considered. So this matrix is perfect and more precise than the tangent stiffness matrix from C.Oran, and this model can be suited to the non-linear stablity analysis of single-layer reticulated shell.
Theoretical Study on Inner Support of Run-Flat Tire
Authors: Zhang Xu , Zhao Hai Rong , Cao Yang , Li Li Wei , Cui Wei Wei , Cui Ji Jun , Feng Zhibn , Li Song Yang , Hao Guo Quan , He De Fang
Published: February 2012

Inner support design criteria is put forward and systematic cornering theory model is established. Displacement differential equation is deduced, and then the radial stress and hoop stress expressions of inner support under the condition of high speed are proposed on the basis of assumption of axisymmetric problem, which makes sure that the inner support is safe under normal pressure and high speed condition. Research results are helpful for inner support structure design of run-flat tire system.
Experimental Study on Fatigue for Stent with Micropores
Authors: Ma Zong Min , Dong He Yan , Qi Min
Published: February 2012

To eliminate the risk of late and very late stent thrombosis of permanent polymer stent, a polymer-free stent direct drug-loading by micropores is developed. To evaluate the safety of micropores stent, fatigue test for micropores stent is carried out. The result is that micropores stent still maintain integrity and has no difference found in comparison with the initial state after 400 mio fatigue cycles --corresponding to about 10 years. The result proves that the fatigue durability of micropores stent is safe, which may help to promote the use of polymer-free stent direct drug-loading by micropores.
Research on Hydraulic Self-Enhancement Technology of Fracturing Pump’s Valve Box
Authors: Jiang Fa Guang , Liang Zheng , Zhao Guang Hui , Wang Pan , Zhang Liang
Published: February 2012

It is very important to process acid and fracturing treatment in oil field to improve permeability. The fracturing pump is one of the key equipment for Acid and fracturing treatment. The valve box of fracturing pump is fundamental, costly and wearing parts. Based on the data from domestic and abroad, the life of the valve box is short. Fatigue cracks caused by alternating stress and erosion account for the most invalidation of the valve box. Only increasing structural size and improving material property are not efficient to prolong service life. Related studies show that hydraulic self-enhancement technology is an effective method and it is used widely to improve service life of fracturing pump’s hydraulic parts. Here hydraulic self-enhancement process was simulated by finite element method and 600 Horse Power fracturing pump was studied. The optimal self-enhancement pressure and loading-unloading treatment method are suggested. This study offers a method to found valve box's production technics by hydraulic self-enhancement technology.
The Graphics Section Moment of Inertia of an Area Rotation Axis Calculation Diagram Method——Moment of Inertia of an Area Circle
Authors: Song Xiao Zhuang , Lu Ming Liang , Qin Tao
Published: February 2012

From the graphics section moment of inertia rotation axis formula can make a geometric figure (Moment of inertia circle), and thus may calculate inertia axis rotation calculation problem, called the graphics section moment of inertia rotation axis calculation diagram method. This method can directly answer some questions to be very difficult answered by analytic method. Moment of inertia circle and the stress circle is in the form of very close, for the mastery of stress circle to compute, grasp the moment of inertia circle is very convenient.
Effects of Passive Backup Force on Delamination in Drilling Composite Materials Using Twist Drill
Authors: Tsao Chung Chen
Published: February 2012

The effect of passive backup force in drilling composite materials was investigated in this study. The passive backup force formation is due to material reacting and bending. The theoretical analysis indicated that the passive backup force has a significant effect on prevention of delamination damage in drilling composite materials. When the is large enough, the effects of the passive backup force and material behavior will be attenuated.
The Design of the Connecting Rod Rapid Prototyping Based on Reverse Engineering
Authors: He Ya Yin
Published: February 2012

According to the features and requirements of link forming, the link is designed by reverse engineering and rapid prototyping. The establishing scan model, gathering data, disposal of data, reconstructing CAD model, and rapid prototyping technology have been explained in detail, the integration of reverse engineering and rapid prototyping in link forming is achieved. The results indicated that the RE/RPM can provide convenience and quick design method for new link development.
Transformer Protection Device Communication Management System Based on IEC60870-5-103
Authors: Sheng Zhao Hui , Sheng Rui , Li Tian Ping , Li Bo
Published: February 2012

To meet the protection devices on-site analysis needs to run and debug, to improve the current deficiencies that exist in engineering applications. The paper designed the transformer protection device communication management system and system interconnect communications, then applied in the actual transformer protection devices.
Kinematics Analysis and Experiments of an Artificial Robot Upper Limb
Authors: Wang Chuan Jiang , Fan Bing Hui , Jiang Hao , Zhang Zhi Xian
Published: February 2012

Owing to great demands for artificial robot upper limbs in industrial production lines, dangerous rescue and even the assistance for disabled people, the research and design is carried out about a robot upper limb which is composed of 6 DOFs. In order to illustrate the robot upper limb system comprehensively, the forward kinematics analysis is finished according to the mechanism. At the same time, the workspace of the designed robot upper limb is analyzed and simulated, and the Monte-carlo simulation results show that the workspace is a continuous closed space, which means that the hand of the designed limb can reach anywhere in the workspace. Moreover, the pingpong grasp experiments are conducted, from the experiment results we can see that the robot upper limb can track and grasp objects around it quickly and accurately.
Excitation and Detection Mechanism of Resonant Gas Sensors Based on Micro-Cantilever
Authors: Li Shuang Mei , Li Guan Min , Wang Na
Published: February 2012

This article analyzes the static and dynamic characteristics of the mcrocantilever. Methods about how to improve the frequency resolution is given on theory. Four pairs of resonant excited and detecting mechanism are analyzed with examples. Besides, the feasibility of the four methods applied in gas sensor is also discussed in the article.
Numerical Simulation of the Nozzle with Self-Oscillating Flow Using the VOF Model
Authors: Zhang Zheng Fu , Wang Jun Wei , Bao Feng
Published: February 2012

The jet water shape of the nozzle will become a self-oscillating shape, if the triangle and U shape models are made into the normal nozzle. Using the VOF model , the jet shape of the nozzle will be simulated through a commercial CFD software 'FLUENT'. The VOF model (Volume of Fluid) is a surface-tracking technique applied to a fixed Eulerian mesh. It is designed for two or more immiscible fluids where the position of the interface between the fluids is of interest. The CFD simulation results shows that the jet shape of the nozzle is oscillate in a fixed period.
Simulation Study on Smooth Movement of Mobile Robot
Authors: Bo Shao Jun , Tian Juan
Published: February 2012

In this paper, a small wheel legged mobile robot has been designed, and stability of its movement on the non-smooth ground has been analyzed. The curve analysis is got by experiments, which shows the wheel legged robot has strong stability and the rationality of structure design .The design has proved that its has strong capacity to conquer obstacle and environmental adaptability
Study on Calcium and Magnesium Fouling of Vacuum Membrane Distillation
Authors: Li Bao An , Liu Xue Jing , Gao Xiao Fei
Published: February 2012

In this paper, calcium and magnesium fouling on membrane distillation process was investigated. The effect of less soluble salts with single component or multi component on flux and membrane fouling was examined, by means of synthesizing seawater. The results showed that the fouling caused by calcium carbonate and calcium sulfate was mainly formed by the attachment of the insoluble substance on the fibers. The calcium sulfate caused the blocking at inlet hole of the module. If there were less soluble salts with multi components in the feed, calcium carbonate was the main form of the fouling.
Structural Analysis and Lightweight Design for Cab Overturned Support of a Medium-Duty Truck
Authors: Dong Yu De , Liu Yong Jun , Wang Ling Lan , Li Ting Zhao , Yang Yi Kui , Liu Cai Yun
Published: February 2012

To adapt to the trend of lightweight of vehicles, and optimize the structure of vehicle components, the former overturned support of a medium-duty truck cab was optimized by lightweight design. The 3d model of the cabin former overturned support was firstly established, and then finite element analysis method was used to analyze the distributions of stress and displacement, with the support under extreme work conditions. And then a lightweight design was made basing on the analysis. The support blank is produced by permanent mold casting method. To meet the requirement of actual production, this paper, analyzed the casting defects of the structure by lightweight design, and then had a further modification basing on the actual casting technique. The results indicate that the weight of the cab support is reduced 23.2%, with lightweight design reducing the support weight effectively under safety. And the modifications of the structure casting performance meet better the structural optimization objective, and make the production of the cab support more efficient.
Kinematics Simulation of Luffing Mechanism of Hydraulic Roofbolter Based on Virtual Prototype Technology
Authors: Wang Xiao Yu , Wei Dong Dong
Published: February 2012

By virtue of Pro/Engineer, the parts of Roofbolter luffing mechanism are established, and the virtual assembly models are completed. Then the models are imported into virtual prototype software ADAMS using the technology of software interface. In the working environment, the virtual prototype of roofbolter are constructed after adding reasonable constraint and drive, also through setting motion function for the hydraulic cylinder of luffing mechanism, the kinematic simulation is conducted, and the results are analyzed and the rationality is verified, also it provides theory basis for the subsequent improvement and optimization.
Study on the Structural Improvement Methods for Car Frontal Crash
Authors: Huang Chao Qun , Lai Fei
Published: February 2012

Taking a sedan as the research object, the frontal impact simulation was done. The results showed that the corresponding results of the structure deformation of the body are in agreement with the experimental data. On account of the driving zone and driver survival space that were compressed seriously, some improvements of the front carling were taken in designing. The structural simulation analysis and dummy injury analysis were done to verify the effectiveness of the improved scheme: the peak acceleration of B-Pillar was greatly reduced, the damage value of dummy was significantly reduced, and so greatly improving the car's passive safety.
Deploying Analyses of Large Deployable Space Antenna under Gravity Environment
Authors: Zheng Fei , Chen Mei , Hao Hai Ming , Zhang Jiu Li
Published: February 2012

The gravity is a serious problem for the deploying experiments of a large deployable space antenna on the ground. With the increasing trend for much bigger size deployable structures, new ground experiment methods with expected effects or with low cost should be explored. On this special object, we propose several deploying schemes from theoretical design, to practical design and then to actual design on a new folded hoop-rib mesh antenna structure we proposed before. Through the fundamental processes from theoretical analyses to actual experiments, it shows that the fairly complex mechanism can be deployed successfully, which reveals that the new deploying antenna structure design is feasible and reasonable.
A Ship General Integrated Design Platform Based on Digital Ship
Authors: Huang Jing Feng
Published: February 2012

A ship general design platform is established in order to satisfy the requirement integrating design, analysis and optimization in ship design process. A design-analysis unified connected model is developed based on digital ship idea and a ship general design platform frame system is formed based on the template technology. In the preliminary application process, a design tool database and an applicative template database are established. That the reliability proves to be good is significant for promoting traditional design method and improving design efficiency.
Study on Design Method of Non-Uniform Beam of Mechanical Structure
Authors: Zhang Guo Zhi
Published: February 2012

The non-uniform equivalent beam design method for non-uniform beam of mechanical structure was proposed. Its equivalent mechanical models of tension or compression and bending was established. Moreover, the erro between the result of FEM and the result of non-uniform equivalent beam design method is less than 5% so as to verify the accuracy of non-uniform equivalent beam design method for typical parameter bending cantilever beam and the tension link. The study in the paper provides a new method and basis for design and calculation of similar mechanical structures.
A Study on the Numerical Analysis of Three-Dimensional Parachute Inflation Process
Authors: Qian Jia , Cheng Han , Su Li Hua
Published: February 2012

The finite element model of a folded parachute is established in this paper. The dynamic change of structure and flow field during the parachute inflation process is obtained based on Arbitrary Lagrangian-Eulerian (ALE) coupling calculation. The accuracy of results is verified by wind tunnel tests. The present work is significant for improving parachute performance analysis, and also can be referenced by other fabrics analysis.
The Symplectic Method for the Bending of Symmetrical Laminated Composite Plates with Clamped Boundary
Authors: Song Jin Guo , Yang You Zhen
Published: February 2012

The symplectic method is applied to study analytically the stress distributions of composite laminated plates in this paper applies. The dual equations were presented by variation principle and introducing separation of variables used. Then in the symplectic space which consists of the original variables and their dual variables, the problem can be solved via effective mathematical physics methods such as the method of separation of variables and Eigen function vector expansion. The equation and Eigen-vector are deduced. The results of cross-ply laminated graphite–epoxy composite plate with clamped boundary are shown, which is compared with established results. The parameters’ influences on mechanical property are also discussed.
Green Supply Chain Comprehensive Performance Evaluation in Electronics Manufacturers
Authors: Ji Shou Wen , Xie Qing Xia , Dong Yan Tao
Published: February 2012

In this paper, an evaluation indicator system of green supply chain in electronics manufacturers is established, including five areas: financial level, business implementation, customer service level, development ability and green degrees. This paper uses the analytic hierarchy process to determine the subjective weights, uses the data envelopment analysis to determine the objective weights, uses fuzzy comprehensive evaluation method (FCE) to evaluate the performance of green supply chain in electronics manufacturers, and has an empirical research.
Study on Direct Chill Continuous Casting of 3003/4004 Clad Slab
Authors: Ren Zheng , Zhu Xiu Rong , Sun Jian Bo , Tang Jin Jun , Zhao Xin Bing
Published: February 2012

The 3003/4004 clad slabs are prepared by direct chill continuous casting. The microstructures on the interface are investigated by optical and scanning electron microscopes, chemical composition distributions across the interface are detected by EPMA, and tensile strengths are evaluated by MTS NEW-810 Materials Test System. The results show that 3003 alloy and 4004 alloy are metallurgical bonding on the interface on the interface, which is results from fusion and diffusion bonding. The thickness of diffusion layers is about 30 μm on average. The tensile strengths of the top, center and bottom regions of the bimetal slab tend to be uniform. The tensile properties of the interface for 3003/4004 clad slab are better than that of 3003 alloy.
Green Synthesis of Silver Nanoparticles Using Chitosan for 4-Nitrophenol Reduction
Authors: Yang Xin , Geng Di , Weng Lian Jin , Han Yuan Yuan , Yang Wen Jin
Published: February 2012

In this study, we report a straightforward route for the synthesis of silver nanoparticles by chitosan under moderate thermal treatment. Chitosan acted as both a reducing agent and a capping agent. The synthesized nanocomposites could function as effective catalysts for the reduction of 4-nitrophenol in the presence of sodium borohydride.
The CFD Study of Velocity of Tubes and Power Consumption in the Tank
Authors: Jiang Bin , Ge Chun , Zhang Lu Hong
Published: February 2012

The project is aimed at describing the mixing phenomena of the new reactor. The solide catalyst deposit on the surface of tubes which affect the flux of the reaction product liquid. The liquid scouring effect is necessary which is relate to the velocity of surface tubes. The new design structure i.e.solide catalyst and liquid in a stirred reactor has been simulated using computational ﬂuid dynamics model (CFD). The arrangement of tubes creat a great effect on the behavior of the fluid, especially the veclocity of surface of tubes. The tank with draft dubes or not have obvious different on the power cosumption and the distribution of solid particles. Power consumption is also taken into account. Compared with Japonic reactor, the design reactor is energy saving which have good potential development.
Supplier Selection and Evaluation in Environmental Purchase
Authors: Hou Fang Miao
Published: February 2012

Supplier selection and evaluation is an important part of environmental purchase in green supply chains. How to determine suitable suppliers in the supply chain has become a key strategic consideration. Although there are many approaches having been put forward by researchers, however, considering the complex and unstructured nature of these decisions, the paper conducts an analysis on how to select desired suppliers by AHP, followed by a case study in an enterprise in China.
Comparison Study for Finished Accuracy of WEDM Process
Authors: Zhang Xiao Yan , Wang Di , Li Xiao Jing
Published: February 2012

WEDM wire-cutting processing is a special machining method using pulse discharge happenns between electrodes and workpieces. This paper have analyzed and compared the two working modes of high-speed wire-EDM machine and low-speed wire-EDM machine. For the holes or slots distributed in mould device should be machined by WEDM method and could meet technical regulation. If all the holes or slots with higher accuracy requirement are machined in one process, the form accuracy and positional accuracy mighty be achieved. The paper compared two machining methods for the special holes with experiment. The result indicates that the improved process can greatly improve the machining accuracy and this method can be used in WEDM-HS and WEDM-LS process.
Optimization of Air Cooling Ribs for 1.5MW Wind Rotor Based on CFD
Authors: Qin Ming , Ge Ming Wei , Shi Wen Jiang , Xiao Shan Cai
Published: February 2012

To enhance heat exchange between the rotor and external environment, many ribs are arranged on the cover of the machine. The air cooling condition for 1.5MW wind rotor is evaluated by Computational fluid dynamics(CFD). It is found that the density of the air, the flow velocity and the arrangement of the ribs on the rotor cover is the main factors impacting the air cooling effect of the rotor. Under the same running power, the air cooling condition becomes worse with the decrease of air density and becomes better with the increase of wind speed. To improve the cooling condition of the wind rotor, the arrangement of the ribs on the cover is optimized. The results show that the width ratio of the ribs and channels plays an important role in the heat convection. In all our cases, 0.5 is the best. Considering the manufacture processing, the arrangement of 400 ribs is selected in our optimization.
Organizational Machines Layout and the Application of Individual Features on the Specific Production Respectively Assembly through the Simulation
Authors: Krajčová Katarína , Pecháček František , Velíšek Karol
Published: February 2012

The great emphasis is currently placed on the optimal layout of individual workplaces and machines in the issue of production and production logistics. It is possible to achieve by the selecting an appropriate organizational layout form of machines and devices. There are several layout forms – technological, subject, free, modular and cellular. The paper is focused on clarifying the basic features and differences of individual machines layout and on the application these features on the specific production of certain part type through the simulation in the simulation program. There are several programs, which are used on the production simulation, for example: Plant Simulation, Simul 8, Witness etc. Witness program is the world recognized program. The utilization of individual machines layout is possible to determine by the using of this program. The simulation of production system is possible to use in the assembly system. The similar problem is solving in a project VEGA 1/0206/09 / Intelligent assembly cell.
Adsorbents for Oxygen-Bearing Low Concentration Coal Mine Methane Enrichment by Proportion Pressure Swing Adsorption
Authors: Li Yong Ling , Liu Ying Shu , Yang Xiong
Published: February 2012

Traditional Pressure Swing Adsorption (PSA) approach of using single adsorbent probably makes methane concentration very close to the explosion limit and may result in explosion risk in the adsorption process, when methane concentration in coal min methane is blow 30%. Based on pressure swing adsorption, Proportion Pressure Swing Adsorption (PPSA), a new enrichment method with high safety, was suggested to enrich low concentration Coal mine methane (LCCMM). A mixture of active carbon (AC) and carbon molecular sieve (CMS) was employed as adsorbent in the process of PPSA. The methane and oxygen in CMM were adsorbed simultaneously. The experimental study was carried out in order to verify the feasibility of this method. The equilibrium adsorption characteristic of AC and CMS were tested, the mixture of AC1 and CMS5 are chosen as adsorbents for LCCMM enrichment by PPSA.
Concretes for Special Applications
Authors: Angelescu Nicolae , Amziane Sofiane , Ionita Cristina , Ion Ioana , Stanciu Darius
Published: February 2012

The paper shows the possibility to utilize, for manufacturing of concrete with aluminous cement, the clay or silicon carbide waste aggregates resulting from demolition of linings, concomitantly with the decrease of cement content by using of the cheap admixtures.