bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Thermomechanical Stress of Casting Refractory and Improvement Measures
Authors: Liu Chang Ming , Wang Zhi Gang , Li You Rong
Published: November 2010

Al2O3-ZrO2-SiO2 material (Also known as AZS) is a very important class of refractory, and plays an important role as high temperature structural ceramics. High stress in the edge of the casting is a major cause of fracture of the product. In this paper, the thermal and mechanical stresses were calculated by finite element method under cooling process. Also, the preheat temperature, thermal conductivity of mold material and thermal convection coefficient known as the influencing factors of thermal stress and decreasing stress measures have been studied. Calculation results indicate the peak stress can be lowered by elevating the preheat temperature, thermal conductivity of mold material can not change the peak stress but influence the changing speed.
Review of Nonlinear Rotor-Bearing Dynamics System
Authors: Wu Xing Cong , Lin Bin , Liu Feng , Han Xue Song
Published: November 2010

This article summarizes the research status of nonlinear rotor-bearing dynamics system in china and abroad, discusses several major problems of nonlinear rotor-bearing dynamics system and refers to a large number of references. The review includes the following three aspects: modeling for the nonlinear oil film force of rotor-bearing system; general analysis methods of nonlinear rotor-bearing system; and numerical analysis methods of nonlinear rotor-bearing system. Furthermore, the problems in current research are pointed out, and the development tendencies are also described: further research on the model of nonlinear oil film force; The dimension reduction methods of high-dimensional nonlinear rotor-bearing dynamics system and optimal design of multi-degree of freedom coupled system; nonlinear parameter identification, modeling and reconstruction methods of rotating machinery; optimal design of nonlinear dynamics for large rotating machinery; Research on the sensitivity analysis of nonlinear vibration and the stability, nonlinear stability margin and nonlinear stability criteria of rotor-bearing-basis coupled system; analysis and research on nonlinear dynamics of rotor-bearing-seal system.
Simulation and Analysis for Spin Angle Track of the Ball Machined by Dual Rotation Plates Lapping Method
Authors: Liu Dun , Deng Qian Fa , Lv Bing Hai , Yao Wei Feng , Yuan Ju Long
Published: November 2010

Spin angle is an important target of expressing ball rotation in the lapping process. Whether lapping track can uniformly cover the ball surface or not is directly determined by the variation of the angle. The simulation of spin angle track of the ball based on ADAMS (Automatic Dynamic Analysis of Mechanical Systems) with Dual Rotation Plates Lapping Method by applying virtual prototype technology and using ADAMS is given by the article. The track based on ADAMS is similar with the track of using mathematical theory on the whole. The simulation results show that DRP lapping method owns better lapping uniformity and it is easy to apply to science for the simplicity of structure and control. The spherical lapping uniformity will be further studied with ADAMS in a convenient way.
An Unequal-Sized Unidirectional Loop Layout Design Problem Considering Empty Vehicle Trip
Authors: Li Yu Lan , Li Bo , Luo Su Jun
Published: November 2010

In the facility layout decisions, the previous general design principle is to minimize material handling costs, and the objective of these old models only considers the costs of loaded trip, without regard to empty vehicle trip costs, which do not meet the actual demand. In this paper, the unequal-sized unidirectional loop layout problem is analyzed, and the model of facility layout is improved. The objective of the new model is to minimize the total loaded and empty vehicle trip costs. To solve this model, a heuristic algorithm based on partheno-genetic algorithms is designed. Finally, an unequal-sized unidirectional loop layout problem including 12 devices is simulated. Comparison shows that the result obtained using the proposed model is 20.4% better than that obtained using the original model.
Analysis of Dynamic Characteristics of Rotary Mechanism for Boom Type Roadheader
Authors: Zhang Ming , Ren Jia Jun , Dong Lei , Wang Xi Sheng
Published: November 2010

A solid model of rotary mechanism for boom type roadheader was built by means of UG software. The solid model was introduced into the ADAMS through the interface of the UG solid model and the ADAMS and a simulation model of machinery-hydraulic coupling system of boom type roadheader was established. Dynamics simulation was carried out. Force curves of the rotary cylinder and the lift cylinder to the rotary table joints under different positions were obtained. The relationship between the axial force and radial force in the same period was analyzed. Research results could improve the stability of boom type roadheader working process and provide a strong theoretical basis for the further optimal design of the rotary mechanism.
Strategy and Applied Research of Multi-Constrained Model of Automatic Test Paper Based on Genetic Algorithm
Authors: Liu Zhi Feng , Shi Ji , Liu Jia , Li Yang
Published: November 2010

Test paper problem is a typical multi-constrained objective optimization problem. By using genetic algorithm, this paper analyzes the initial population generation, the chromosome coding and its genetic manipulation, control parameters. Solving that by natural-coded genetic algorithm, improves test paper success rate and convergence rate. This genetic algorithm is applied successfully on NHibernate architecture, and developed "automatic test paper" Online Examination system.
Structural Design of Hoist Boom of Bracing-Hoisting-Separated Barrier-Clearing Vehicle Based on ANSYS
Authors: Zhang Zhan Guo , Liu Xiao Yong , Jiang Xu Dong
Published: November 2010

On the basis of structural design of hoist boom of bracing-hoisting-separated barrier -clearing vehicle, its static analysis by ANSYS was studied to determine the location of insufficient strength, and the improvement methods were proposed. Taking the length and width of the slider in the hoist boom as the design parameters, a parametric model was established. The relationship between the maximum stress of the contact position of hoist boom with sliders and the dimension of slider was identified. The effective approaches to reduce the maximum stress were obtained which included increasing the length of slider or the thickness of top coverboard of basic boom.
Study of the Influence Rules between Structural Parameters and Jet Characteristics of a Liquamatic Fire Water Monitor with Self-Swinging Device
Authors: Hu Guo Liang , Hu Ai Min , Liang Ju Xing
Published: November 2010

Fire water monitor is one of the most commonly used equipments in fire fighting. A liquamatic fire water monitor with self-swinging device was designed. The mechanism of an impeller driving four bar linkage was applied as the self-swinging device. The working principle of the liquamatic fire water monitor was introduced. The internal flow performance was simulated using Fluent software; and the influence rules on jet characteristics were analyzed by changing the cross-sectional shape and diameters of the monitor body, inlet pressure and drive set of the self-swinging device. These analyses led to the optimal structural parameters of flow channel. These simulation results will provide useful theoretical guidance for design of other types of fire water monitor.
Study on Assessment Method and Statistical Distribution of Roundness Error
Authors: Wang A Chun , Ji Li , Teng Yun Nan , Zhang Lei
Published: November 2010

The active academic basic of the shape tolerance and shape error assessment is a geometrical problem which is based on the shape tolerance zone. The research puts forward the probability distribution of the statistical roundness error on the condition of the researching about roundness error of rotor parts and does experimental measurement and data collection. In order to prove that it complies with certain probability distribution law, the fitted roundness error should gain the statistical distribution result by using mathematical statistics.
Analysis of Dynamic Characteristics of Space Deployable Antenna Based on ANSYS
Authors: Tian Da Ke , Liu Rong Qiang , Deng Zong Quan , Guo Hong Wei
Published: November 2010

Analysis of dynamic characteristics is one of the important parts of structure analysis for space deployable antenna. In order to study the dynamic characteristics of truss structure for space deployable truss antenna, according to the structure composition, the finite element model of truss structure is built by using ANSYS software, and the modal analysis is carried out by finite element method, then the natural frequencies and the features of vibration modes are obtained. It is emphatically analyzed that the influence of structure parameters such as chords, vertical beams, diagonal beams and crossing cables on the first natural frequency, and the change curves of natural frequency are given. The results can provide the theoretical basis for the antenna’s structural optimization design and dynamic modification.
Study on Experiment of Drilling for Titanium Alloy Ti6Al4V
Authors: Wu Hong Bing , Jia Zhi Xin , Zhang Xue Chang , Xu Chen Guang
Published: November 2010

The quality of hole is difficult to be guaranteed and tools wear severely in the drilling process of titanium alloy. To investigate more efficient methods to improve the quality of holes, the drilling experiments of titanium alloy Ti6Al4V were carried out under different drilling speed and different feeding speed. The drilling force was achieved through the dynamometers in the experiment. Simultaneously, a series of drilling experiment of titanium alloy was carried out with the two different shape drills and three different diameter drills. The comparison of the achieved drilling force proved that the sharpened tool is better to guarantee the quality of hole for titanium alloy Ti6Al4V.
Study on Numerical Modeling of Three Dimensional Oblique Cutting for Aluminum Alloy Cutting Process
Authors: Zhang Xiang Hua , Dai Guo Hong
Published: November 2010

To reveal the cutting process of aluminum alloy 7050, the oblique cutting finite element model was established to simulate the cutting process. The key techniques including material constitutive model and temperature finite element model were investigated. The chip of aluminum alloy 7050 formed in the simulation of cutting process, and the cutting force curve and cutting temperature distribution were analyzed. The chip obtained by simulation is spiral, and the chip shape of simulation agrees well with the chip of cutting experiment. The oblique cutting finite element model of aluminum alloy 7050 can be used to investigate the optimization of cutting parameters and tool angle further.
Study on Profile-Adaptive Tool System for Small Robots in Large Freeform Surface Polishing
Authors: Liu Qi Tong , Zhan Jian Ming , Mao Jian Hua
Published: November 2010

An adaptive tool system of polishing robots for large freeform surface which is installed discoid tool is proposed. To improve processing efficiency, the mechanical of adaptive tool system adjust to curvature changing of large freeform surface is designed. Adaptability of the processing is analyzed and simulated, and kinematic equation of tool system is established. The polishing process of large freeform surfaces with tool system is analyzed.
Study on the Automatic Wiring of Small Mechanical and Electrical Equipment
Authors: Cao Peng Ju , Quan Jian Zhou , Li Xiao Feng , Zhou Ling
Published: November 2010

The wiring of small mechanical and electrical equipment is one of the bottlenecks in rapid R&D and reliability. The path optimization is the essence of wiring. The paper proposed a new automatic wiring method based on improved A* algorithm, which adapts to three-dimensional path search. The cost for bending and processing was introduced into evaluating function, the rigidity factor was also introduced to improve search efficiency. The wiring module for virtual assembly is developed by UG API implementation. The results show that the method is effective.
Study on the Modification of Gear with Arcuate Tooth Traces
Authors: Min Zou , Zhu Hai Lin , Cheng Chen
Published: November 2010

Only in the middle section of the tooth width, the profile of the gear with arcuate tooth traces is involute; the profiles are envelopes of hyperbolas in the other sections which arevparallel to the plane mentioned. Up to now, there is no publication dealing with the possibility of modification. By using mathematics in meshing theory, this paper shows that the gearing only with reference center distance could be used other than with modified center distance.
Study on YAG Laser Welding Process of Fe-Mn-Si Shape Memory Alloy
Authors: Zhou Chao Yu , Lin Cheng Xin , Liu Lin Lin
Published: November 2010

In this study, 1mm thick Fe-Mn-Si shape memory alloy was welded by both sides using YAG laser welding. In a certain range of parameters, the optimal processing parameters for the maximum tensile strength are current 100 A, pulse frequency 3 Hz and pulse width 15 ms by orthogonal experiment. With the optimal processing parameters, the tensile strength of the welded joint can achieve 94% of base material,and the fracture appears in the center of welding seam and the surface morphology of welding seam is good. The influence of processing parameters on tensile strength of weld joint is directly embodied in cross-section of the welding seam morphology. In the laser welding, the tensile strength of nonpenetration in seam and hourglass shape welded joint is generally poor, and the perfect welded joint has conditions such as wide welding seam, deep penetration, weld pool filling and “non-hollow”. Most importantly, the central area in cross-section of the welding seam is the widest.
Surface-Surface Contact in 5-Axis NC Machining of Sculptured Surfaces Using Anural Cutter
Authors: Liu Quan Hong , Liu Hu Ran
Published: November 2010

Sculptured surface are used in a wide variety of applications in the automotive, aerospace and ship building industries, such as turbine blades, impeller and marine propellers. The original design concept is often embodied in a physical model, perhaps sculpted from clay by a skilled artisan, from which measurement data is scanned. Surfaces are fitted to the scanned data, and a mathematically precise description is then available for subsequent steps in the product-design process. Parametric forms such as the well known Bezier, B-spline and NURBS type usually mathematically define the surfaces. Typically, a design is composed of number of parametric surface patches. This is the highly effective method. In this paper an innovative theory for machining complicated surface is presented. By using an anural milling tool instead of ball-end mill or the flat-ended tool, and by adjusting the axis of cutter relative to the surface, the two surfaces, the swept surface and the required surface, have the same curvatures, up to as high as 3rd order. Through the deduction of differential equation, some theory on partial touching between surfaces and surfaces when manufacturing has been explored. The problem of axis orientation under this condition has also been discussed clearly. The outside of the circular tool is a surface; the surface to be machined is a groove, which can be represented by its transverse line. In this case the problem is attributed to the contact between surface and curve.
Technological Research on Preparing the Ni—Cr Cladding Layer on the Surface of Copper
Authors: Liu Neng Wen , Wang Yun Shan
Published: November 2010

Copper has some excellent performances in anti-erosion and high thermal conductivity. It is applicable in many important fields. In the paper, two methods of preparing Ni-Cr alloy cladding layer on the surface of copper are proposed, including the spray welding and YAG pulse laser cladding .Then the Ni-Cr alloy layer prepared on the copper is investigated by optical microscopy, there is no hole and crack in the cladding layer. The experimental results show the coating is metallurgically bonded with the substrate. In comparison to the prepared cladding layers, the Ni-Cr cladding layer prepared by YAG pulse laser is the better, the size of copper is not restricted, and the copper substrate isn’t preheated.
The Design of Double-Helix Single-Screw Pump Based on PRO/E
Authors: Huang Xiao Bing , Wen Guang
Published: November 2010

Based on the unique merit of double-helix single-screw pump, its working principle is analyzed and its rolling bush and screw profile are designed in this paper. The 3D modeling and virtual assembly of double-helix Screw Pump are established based on Pro/E. The results showed that the multiphase pump could assembly with the design without interference. It provided the reference for optimal design and experimental prototype manufacturing.
The Mechanical Analysis of an Injection Machine Clamping Unit
Authors: Yu Guo Qiang , Zhang Gang , Weng Sheng Feng , Huang Hai Bo
Published: November 2010

The paper is to simulate and analyze the mechanical behavior of the clamp system of an injection molding machine. Different commercial simulation tools are combined to create complete model of the system. The flexibility of several components is included by importing a FE model generated in ANSYS. Then the dynamic characters are presented in MBS software ADAMS. The mechanical behavior of connecting bars, tie bars were analyzed and quantified in order to work out improvements. The results show that the rear link and tie bar were the weakest parts in terms of safety.
The Mode and Structural Design of Venting System for Injection Mold
Authors: Li Hong Lin , Tang Ting Xiao
Published: November 2010

In injection molding processes, while the plastic is injected into the mold cavity, the displaced air leaves the mold through openings which are referred to as the venting slots. With the continuous improvements of manufacturing precision and injecting speed, the design of venting slot is becoming an important problem which influences the quality of products greatly. In this paper, five types of possible location to generate “gas-trap” were summarized based on the research and analysis of mold manufacturing and injection molding. The dimensions of venting slot, eight kinds of venting mode and their corresponding structures were presented. The principle for the design of venting system was proposed.
The Novel Design of Full-Balancing Mechanism for Single-Cylinder Diesel Engine
Authors: Yin Bi Feng , He Jiang Guang , Xu Yi , Li Yong Qiang
Published: November 2010

One new sliding-block balancing mechanism is proposed for the single-cylinder diesel engine. In the new mechanism, the sliding block is installed against the engine piston. The reciprocation trajectory of sliding block is collinear with the piston trajectory, while sliding block and piston move in the opposite direction, just like two opposite crank connecting rods. The new mechanism includes the crankshaft, connecting rod ring, the slider and the guide components. Through the bearing, connecting rod is installed in the eccentric journal of the crankshaft. The circular connecting rod is in the accurate guiding surface of the slider; and the guide pins are in the guide groove. Guide rod connects with supporting shaft through the guide hole of the slide. The optimized parameters for the sliding block show that the ratio of eccentric distance of the eccentric journal to the length of the connecting rod is equal to the ratio of crank radius to connecting rod length. The appropriate results can balance both the centrifugal inertia force and the reciprocating inertia force generated by piston group. Even the complete balance of the first and second-order reciprocating inertia forces can be obtained, which can reduce the vibration and noise of diesel engine.
The Research of Air Fuel Ratio Self-Learning Control Strategy Based on UEGO Sensor
Authors: Tang Lan , Meng Wu Qiang , Gan Hai Yun
Published: November 2010

This paper begins with physical characteristics and the basic working principle of the traditional switch-type Exhaust Gas Oxygen (EGO) sensor and Universal Exhaust Gas Oxygen (UEGO) senor, and then it analyses the Air-Fuel ratio (A/F) Self-learning Control strategy and designs A/F Self-learning Control algorithm of Electronic Control Turbocharged CNG lean-burn engine based on UEGO sensor. At the end, it uses the written control code into ECU of the test engine, and after bench calibration tests it shows that the designed algorithm can compensate wearing, tiring, aging and other state of the engine and improve A/F control accuracy.
Topology Optimization Design of Integral Structure of Woodworking Machine Tool
Authors: Meng Zhao Xin , Cao Jun , Li Zhi Wei , Zhao Jian Xin
Published: November 2010

In accordance with integral structure of woodworking machine tool (WMT), this paper uses the method based on topology optimization design to establish the objective function, constraints, and convergence Criteria. In the meantime, some related factors of woodworking machine tool (WMT), such as economical efficiency, stability, and dynamic properties are taken into consideration. Moreover, through analyzing an instance, the validity of design method has been demonstrated.
Total Quality Innovation of Manufacturing Enterprises Based on Innovation Unions
Authors: Tu Jian Fei
Published: November 2010

The quality is the eternal focus of market competition. Based on the analysis of the forming process of product quality, a total quality innovation model including investigating, designing, manufacturing and re-exploring quality characteristic requirement has been put forward. The characteristics of the total quality innovation is analyzed in detail, its tactics and channels based on the innovation union is constructed, and puts up with the forming structure of the total quality innovation union, including requirement investigation organization, product design enterprise, material supplier, product manufacturing enterprise, processing enterprise of components and parts, clients, colleges and universities, research institution, marketing and service company etc.
Unified Framework and Performance Analysis of Transaction Adjustment Models in Congestion Management of Power System
Authors: Wang Ying , Wang Shuang , Xu Wen Jun
Published: November 2010

This framework can not only include all kinds of existing transaction adjustment models in the Pool, bilateral/ multilateral and Pool+bilateral/ multilateral trade modes, but also establish new transaction adjustment models by setting different parameters. A comprehensive model frame-work for investigating the congestion relief problem was provided. Then, based on the unified framework, three performance indexes, i.e., the market benefit, the effect of manipulation and the choice degree of participants are presented to compare the transaction adjustment models. The existing transaction adjustment models are evaluated, and the comparison results show that the transaction adjustment models in the Pool+bilateral/multilateral trade mode are superior to those of Pool or bilateral/multilateral trade mode as a whole.
Virtual Instrument for Measuring Elastic Modulus of Wood Floor
Authors: Zhao Dong , Zhang Jian Zhong , Zhao Jian
Published: November 2010

Elastic modulus is one of the most important performance parameters of wood-based material, and plays an important role for predicting and evaluating quality of wood-based material. At present, the traditional problems for measuring elastic modulus of wood-based material are: expensive testing instrument, short precision, low immunity to noise and less ease to connect. This paper presents a new elastic modulus-measuring system based on virtual instrument. The system ensures the following functions: (1) real-time data acquisition, (2) signal processing and analyze, (3) saving the file in the appropriate format, (4) computing dynamic elastic modulus by the natural frequency. The analytical results of our experiments show that it is feasible, reliable and effective to use the proposed instrumentation for measuring elastic modulus of wood-based floor.
X-Ray Measurement for Residual Stress in Cold Ring Rolling
Authors: Zuo Zhi Jiang , Yu Wu Xin , Yang Jun Jie
Published: November 2010

The residual stress in cold rolling could decrease the accuracy of ring parts. Because many factors could cause residual stress, it’s difficult to calculate it theoretically. At present, a measurement method was generally used to study the residual stress. For example, X ray could be used to measure residual stress in rings. Through the measurement of residual stress, it could not only obtain the residual stress level after ring rolling, but also validate the finite element model to predict the residual stress distribution. However, because the ring surface was circle, it needs to cut a plane for X ray measure, and it increases measurement inaccuracy. This method only could be suited for qualitative analysis of residual stress in cold ring rolling, and it is not suitable for quantitative analysis of residual stress distribution.
Application and Analysis of RBF Neural Network for Burr Prediction in Micro-Machining
Authors: Zhu Yun Ming , Wang Gui Cheng
Published: November 2010

Micro-milling is widely used in material removal processes in industry. However, burrs are often formed on workpiece edges in milling process. Burr effects the dimensional tolerance and performance of the workpiece seriously and is desirable to be controlled. Burrs prediction technology is useful for cutting conditions optimization to control burrs forming. Due to lots of factors influencing the formation process of burr, it is a difficult task to establish the burr size prediction model by mathematical and mechanical method. RBF neural network was used for burr formation predition. Design of the network, network structure parameters determination and generalization capability of the network were analyzed and discussed. Achieved network has good fitting performance and generalization capability validated by experiments.
Application Study on Resonance Demodulation Technique in Fault Diagnosis of Gear Box
Authors: Hao Qian , Gao Li Xin , Wang Xu , Ye Hui
Published: November 2010

Fault vibration signals of gear box are faint shock and are hardly extracted, which bring a big difficulty for diagnosis. This paper mainly introduces the basic principle of the resonance demodulation technique and its application study in the gear box’s fault diagnosis. The developed resonance demodulation technique can effectively extract the fault features from complex vibration signals through the resonance demodulation technique according to the vibration features of the gear box, and improve the equipments’ fault diagnosis precision.
A Novel CAM System with X/Y/Z 3-Axis Machines for Large Scale Aspheric Lens Grinding
Authors: Lei Xiang Yang , Huang Hao , Zhang Shi Han , Wang Jian , Xu Qiao , Guo Yin Biao
Published: November 2010

According to needs of aspheric lens grinding and measurement with X/Y/Z 3-axis grinding machines, a CAM system is designed and implemented. The system, based on the parallel grinding geometry model, has realized the function of grinding locus planning, form error compensation, NC program auto-generation, on-machine measurement, grinding wheel on-machine measurement, simulation and technical database. To verify the stability of this CAM system, experiments were performed with three independent machining experiments. The experimental results indicate that the system realized the whole process of aspheric grinding, and it improved the machining efficiency and automation. Especially, this system adopted on-machine form error compensation technology and improved the machining accuracy. By implementing the error compensation integrated in the CAM system, the surface form error of a 430mm×430mm aspheric lens is decreased from PV8.2µm to PV4.1µm. The grinding accuracy was improved 100%.
Design and Simulation of Electric Pallet Truck Hydraulic Anti-Skid System
Authors: Li Guo Ping , Wang Lu Wei , Shu Li Sheng
Published: November 2010

Based on electric pallet truck skids in the process of moving because of low road attachment coefficient, this paper proposed an anti-skid method by changing the proportion of enduring pressure between the driving wheel and trundles. Anti-skid control theory of the new method is researched and mathematical models of the main modules are established. Anti-skid control system is simulated by using AMESim and Matlab / Simulink software. Simulation results show that, this hydraulic anti-skid system can respond quickly and precisely.
Design Calculation about Oxynitride Concentration for Tunnels on Inghai-Tibetan Railway
Authors: Sun San Xiang , Yu Nan Yang
Published: November 2010

In this study, a computational analysis of the distribution of oxynitride concentrations in a tunnel is carried out by using the one-dimentional numerical method for a train-induced unsteady flow. The discretized equations are solved using the finite volume method. The results show that the calculated value and measured one is compatible basically. It can provide a theoretical basis and new idea for design.
Design of a Knowledge-Based Self-Assessment System for Enterprise Knowledge Management Evaluation
Authors: Xu Yi , Zhan Hong Fei , Yu Jun He , Sun Li
Published: November 2010

Performance evaluation for knowledge management in organization is an important task under enterprise management. This paper designed a knowledge-based self-assessment system model based on Criteria for Performance Excellent framework established by National Institute of Standards and Technology (NIST). Firstly, the base framework and self-assessment scoring guidelines were introduced and explained. The paper also did requirement analysis for the system and explained the system function in details. Lastly, system process model and flowchart of primary function was designed.
Dimension Classification Method of Multi-Loop Planar Mechanism
Authors: Zhao Deng Feng , Zeng Guo Ying
Published: November 2010

Based on the group theory and the complex division method, the dimension classified method for planar multi-loop mechanism was analyzed. Firstly, the dimension classified inequation was derived from the singularity of constraint equation of the mechanism. Subsequently, by using the classified inequation, the complex division method of the structure-parameter-space was explored. By using the mechanism symmetry group, the simplification method of the division results was analyzed. Finally, by using an example, the classified methods were validated. The results show that all information about mechanism classification are included in the division results. Besides, this method is appropriate for complicated mechanism classification by computer.
Evaluation of Innovation Effect of Residential Design Based on Fuzzy Comprehensive Evaluation Method
Authors: Pan An Ping
Published: November 2010

The fundamental purpose of housing design innovation is to provide residents with functional, well equipped, comfortable and beautiful living space, to achieve sustainable development goals of saving land, energy, materials. In order to set reasonable targets and standards for evaluation, we adopt a comprehensive fuzzy method to evaluate and compare the program overall performances, on the base of collecting the tenements views on the performance, price, use effect as well as various technical and economic indicators of residential building system of the new technology and new materials of the housing construction, soliciting for the advice of Designers and Construction workers, considering the factors of technical, economic and social, combined with our experience.
Experimental Investigation on Grinding-Induced Surface Damage of Fiber Reinforced Ceramic Matrix Composites
Authors: Shi Yan Shi , Wang Yu Guo , Lin Bin , Yu Ai Bing
Published: November 2010

The single factor experience of Fiber Reinforced Ceramic Matrix Composites (briefly named FCC) grinding was done on a NC optical curve grinding machine, and then the morphologie of the grinding surface was observed with an optical microscope. The effect of the grinding parameters, which include mainly grinding depth, abrasive grain size of diamond grinding wheel and grinding direction, on the grinding-induced surface damage of FCC was discussed, finally, the paper drew the conclusions that both increasing of grinding depth and increasing of abrasive grain sizes of diamond wheel can make the grinding-induced surface damage worse, and that different grinding directions also produce different effects on the grinding-induced surface damage.
Experimental Study of the Small Lubrication Holes on the Die Shoulder on the Formability in Cylindrical Cup Deep-Drawing
Authors: Shi Yu Qing
Published: November 2010

Wrinkling and tearing are major defects that usually occur in the deep-drawing process. This study presents a new sheet forming technology, together with machining small lubrication holes on the die shoulder. Deep drawing process of cylindrical cups with flange is investigated. Mechanical characteristics of die shoulder with small lubrication holes in deep drawing are analyzed. Numerical simulation and experimental methods are used to determine the influence on formability of machining small lubrication holes on the die shoulder. The results show that this new sheet forming process can improve formability and forming quality.
Finite Element Analysis and Structure Optimization on Light-Duty Truck Driving Axle Housing
Authors: Fu Jing Shun , Wang Jin , Wang Jun Feng
Published: November 2010

The strength and the stiffness of light-duty truck driving axle housing were analyzed by using the finite element method. The stress distribution and the dangerous section were obtained. The result indicates that there is an obvious stress concentration region in the body of the driving axle housing. The local stress of driving axle housing can be reduced by the improvement of local structure.
A Drive-Transmission Integrated Linear Electromechanical Actuator
Authors: Chen Wen Jia , Zhang Jiang , He Yan Zhong
Published: November 2010

Based on the idea of integrated design, a drive-transmission integrated linear electromechanical actuator is developed. The actuator consists of a permanent magnet synchronous motor (PMSM), a ball-screw and shells. By using coaxial assemblage, the ball-screw is inserted into the hole of the hollow motor rotor and the nut of the ball-screw connects with the motor rotor. In order to restrict the ball-screw rotating relatively to the shell, splines machined respectively on ball-screw and the shell come into being a spline pair. A driver based on a DSP processor and IGBTs plus a position feedback resolver forms a precise servo system.
Improving the Quality in Deep Drawing of Rectangle Parts Using Variable Blank Holder Force
Authors: Shi Yu Qing
Published: November 2010

Wrinkling and tearing are the main failure modes in sheet-metal forming. Wrinkle may occur at the start of a punch stroke if the blank-holder force (BHF) is too low, and tearing may occur at the end of a stroke if the BHF is too high. The BHF is important for deep-drawing because of an effective way to promote deep formability sheet metal. They can be reduced or eliminated by manipulating a suitable BHF during sheet-metal forming. This paper presented an attempt to determine the effect of variable BHF on the tearing and wrinkling and investigated using 08Al sheet metal. The experiment show that tearing and wrinkling can be eliminated and the quality of deep drawing of rectangle parts can be improved using variable BHF.
Influence of Micro Trapezoidal-Groove on Behavior of Sliding Tribopairs
Authors: Zhang Pei Yun , Zhang Yan Hu , Wang Xiao Li , Hua Xi Jun , Fu Yong Hong
Published: November 2010

The effect of various micro isosceles-trapezoid grooves on improvement of tribological performance is discussed. It is accomplished through the CFD-approach where the momentum and continuity equations are solved separately, one of low Reynolds turbulence models-Abid index and SIMPLE algorithm in theory of Control Volume Method are adopted. For different width and depth of micro isosceles-trapezoid grooves, the load supporting capacity of oil-film are compared. The results show that the widths has more influence than the depths on hydrodynamic lubrication, and relative parameters change monotonously with the depth of micro-groove. The effect of texturing arc-grooves on improvement of tribological properties is conspicuous if w1= 40μm, w2= 10μm and hp= 10μm for micro isosceles-trapezoid grooves.
A Study on Holonic Control in Intelligent Car
Authors: Chao Yan , Lei Qiong Hong , Fu Dan Dan , Wu Li Qun
Published: November 2010

Traffic incident influences the security of people in the popularity of navigation. It is urgently necessary to develop intelligent vehicles by using new technologies and advanced methodologies. In this paper, a new approach based on holonic conception is presented to study the intelligent control in vehicle tool. The control structure in car is divided into three levels and is defined three holonary, the function of every holon level is discussed, then a distributed multilevel intelligent control architecture in car based on holon is developed. The cooperation relation is analyzed between different levels; the cooperative model is established to study cooperation mechanisms among different holon level, which will help to improve the intelligent control and vehicle security for car.
Influence of Reground Tool Sharpness on Micro-Cutting Process
Authors: Tian Xin Li , Li Zhao , Tang Xiu Jian , Guo Fang , Yu Ai Bing
Published: November 2010

Tool edge radius has obvious influences on micro-cutting process. It considers the ratio of the cutting edge radius and the uncut chip thickness as the relative tool sharpness (RST). FEM simulations of orthogonal cutting processes were studied with dynamics explicit ALE method. AISI 1045 steel was chosen for workpiece, and cemented carbide was chosen for cutting tool. Sixteen cutting edges with different RTS values were chosen for analysis. Cutting forces and temperature distributions were calculated for carbide cutting tools with these RTS values. Cutting edge with a small RTS obtains large cutting forces. Ploughing force tend to sharply increase when the RTS of the cutting edge is small. Cutting edge with a reasonable RTS reduces the heat generation and presents reasonable temperature distributions, which is beneficial to cutting life. The force and temperature distributions demonstrate that there is a reasonable RTS range for the cutting edge.
Injection Molding Process Optimization of Multi-Objective Based on MUD-RBFNN-GA
Authors: Sun Bao Shou , Chen Zhe , Gu Bo Qin , Huang Xiao Diao
Published: November 2010

The optimization algorithm of MUD-RBFNN-GA was proposed in this article. An injection molding process optimization model of multi-factor and multi-objective was also researched. The multiple uniform designs of experiment was applied to optimize the processing parameters. During this process, the RBF neural network was established, where the melt temperature, mold temperature and packing pressure were taken as the inputs, and warpage, area of air-traps and weld-line length as the outputs, and the Moldflow simulation analysis was used to obtain the output values. By combining the algorithm with genetic algorithm and global optimization in the networks, we can get the optimal process parameters. The results show that the multi-objective optimization based on MUD-RBFNN-GA is practically applicable, and it can reduce the molding defects effectively.
“Inside & Outside”-Design Method for Small and Medium-Sized Enterprises
Authors: Wang Xiao Chun , Shi Ke Jian
Published: November 2010

In this paper we proposed an "Inside & Outside" design method which is suitable for small and medium–sized enterprises to solve the problems that small and medium–sized enterprises usually meet with non-design and tough design. The meaning as well as the principles of this method was explained in detail, meanwhile the process to find out the production opportunities in a short time for small and medium–sized enterprises with the provided method was discussed. Finally, a case study on the improvement of a specific product was analyzed so as to be an illustrated-example.
Investigation into Fluid Velocity Field of Wedge-Shaped Gap in Grinding
Authors: Li Chang He , Han Zhen Lu , Li Jing Yao
Published: November 2010

In the grinding process, grinding fluid is delivered for the purposes of chip flushing, cooling, lubrication and chemical protection of work surface. Hence, the conventional method of flood delivering coolant fluid by a nozzle in order to achieve high process performance purposivelly. However, hydrodynamic fluid pressure can be generated ahead of the grinding zone due to the wedge effect between wheel peripheral surface and part surface. In this paper, a theoretical fluid velocity field modeling is presented for flow of coolant fluid of wedge-shaped gap in flood delivery surface grinding, which is based on navier-stokes equation and continuous formulae. The numerical simulation results showed that the velocity in the x direction was dominant and the side-leakage in the y direction existed. The velocity in the z direction was smaller than the others because of the assumption of laminar flow. The smaller the gap is, the larger the velocity in the x direction. The magnitude of the velocity is also proportional to the surface velocity of the wheel.
A Study on Nanocrystalline Nickel Parts Prepared by Jet Electrodeposition
Authors: Chen Jin Song , Huang Yin Hui , Qiao Bin , Yang Jian Ming , He Yi Qiang
Published: November 2010

The principles of jet electrodeposition orientated by rapid prototyping were introduced. The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument. The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure (average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters.
Model and Algorithm of JIT Purchase Based on Actual Freight Rate
Authors: He Wei Ming , Hu Yan Hai , Guo Li Li
Published: November 2010

Based on single vendor and single buyer, vendor supplies buyer with a product, and the vendor split order into many equal shipments to delivery. Aimed at minimizing the total cost of vendor and buyer, JIT purchase model based on actual freight rate was proposed. Actual freight rate is transformed into alternating ranges of a constant charge per kilogram followed by a constant fixed charge. For the actual freight rate, by calculating the solutions for all weight ranges and comparing them, the optimal solution was derived. Numerical results show that the algorithm can obtain the optimal solution, and the model is verified.
Ni-Doping Alumina Foams for Fabricating MMCs by Pressureless Infiltration Using Fe Alloy
Authors: Yang Shao Feng , Chen Wei Ping , Han Meng Yan , Zhu De Zhi
Published: November 2010

The preparation of Ni-doping alumina foams as precursors for MMCs (Metal Matrix Composites) fabrication was studied. Alumina foams were successfully adulterated with Ni using organic foam impregnation technique. Uniform Ni particles were distributed in alumina struts after they were sintered in a vacuum furnace. At the crucial infiltration step, an inducer such as elemental Ni melted so that interpenetrating channels were created in the ceramics. In contact with Fe melt, the metal matrix could spontaneously infiltrate in alumina foams struts. The influence of infiltration was subsequently investigated by SEM and EDS. Preliminary results showed that the interface between Ni-doping alumina foams and Fe metal matrix reached a full structural homogeneity and the use of Ni-doping alumina foams enhanced the capability of infiltration when processing continuous three-dimensional interconnected ceramics/metal networks MMCs by pressureless infiltration technique.
Noise Radiation Analysis of Structural-Acoustic Coupling System of a Gear Box
Authors: Zhou Jian Xing , Liu Geng , Ma Shang Jun
Published: November 2010

The dynamic model of the gear transmission system is built in consideration of the time-varying mesh stiffness and the gear errors. Then the time history of the dynamic load of system is calculated. The gearbox structural-acoustic coupling system is built and its noise radiation is calculated by using BEM. The noise spectrum of the gearbox and the panel contribution are obtained. The influence of the gearbox structure improvement, structure damping and different gear style on the noise radiation is analyzed. The study provides useful theoretical guideline to the design of the gearbox.
Numerical Analysis of Pressure Straightening Process to High Pressure Boiler Tube
Authors: Tian Ya Qin , Huang Qing Xue , Li Jin Bao
Published: November 2010

The biggest straightening force is one of the important parameters and has an important influence to straightening effect in the straightening process. In this paper, the numerical experiment of loading counterweight force was carried out by finite element analysis software in the steel tube bending. In bending straightening process of numerical calculation, two kinds of steel tube were selected, the size being Φ720mm, δ120mm and Φ325mm, δ55mm, respectively. The straightening force variation law of bending steel pipe was obtained under the plastic state trends in the straightening process. The best control parameters of steel pipe straightening have been identified for the steel pressure straightening and provide a theoretical basis for parameter determination.
Numerical Simulation of Cutting Force and Temperature Field in High Speed Machining of Titanium Alloys
Authors: Yan Cong Ming , Lin You Xi
Published: November 2010

Improvements in manufacturing technologies require better modeling and simulation of metal cutting processes. A fully thermal-mechanical coupled finite element analysis (FEA) was applied to model and simulate the high speed machining of TiAl6V4. The development of serrated chip formation during high speed machining was simulated. The effects of rake angle on chip morphology, cutting force and the evolution of the maximum temperature at the tool rake were analyzed with the finite element model. The simulation results show that the segmented chip formation results in cutting force fluctuation. Although the segmentation frequency of the chip increases with the increase of the rake angle, the degree of segmentation becomes weaker and the cutting force fluctuation amplitude decreases. The predicted temperature distribution during the cutting process is consistent with the experimental results given in a literature.