bluuebunny/crossref_metadata_2025 huggingface dataset:
Fault Prediction Method Based on Data Mining in Semiconductor Test Line
Authors: Yue Ren Hong , Ma Yu Min , Qiao Fei , Wu Xing Hao
Published: January 2012

In semiconductor test system, test equipment all have a period of usage. When the test time of equipment is larger than its period of usage, its fault will occur frequently. This paper will use data mining method to predict the next time point of fault based on the history data related to equipment fault. By this, a method of equipment fault prediction will be put forward, and provide the decision support for semiconductor equipment maintenance.
Control of Pushing and Pulling Motion of a Wheeled Inverted Pendulum Based on a Reduced Order Observer
Authors: Canete Luis , Kimura Sunao , Takahashi Takayuki
Published: January 2012

In this paper the control of the I-PENTAR, a wheeled inverted pendulum type robot being developed by the authors, for pushing and pulling a cart is examined. To control the movement of the object is being pushed or pulled, information regarding several external parameters, eg. Mass of the object and friction components, must be considered. In most cases these parameters are not known before hand or may change. One method of compensating for these unknown or changing external parameters is to represent them as an equivalent reaction force from the object. Our first subject of this research is to design a disturbance observer to estimate and compensate the equivalent force. Another situation is of pushing and pulling a cart with the inverted pendulum type robot traversing an inclined plane. As an initial step to solving this problem in this paper, a force application method using whole body motion of the inverted pendulum type robot is proposed. The whole body motion means changing the balance of the robot to attain a certain desired force. During application of this force the robot must remain in its stabilized or balanced state. For an inverted pendulum type robot, this instantly poses a major problem. To solve the problem, a reduced order disturbance observer is used in this paper to estimate the force applied by the robot. On the other hand, I-PENTAR is targeted for environments where it can interact with humans and so safety is a major concern. For example, in the event that an obstacle bumps the robot as it is pushing the cart, a large and sudden force estimator based on the disturbance observer is also built into the controller. Simulation and experiments using the reduced order disturbance observer and evaluation of the whole body motion force control are presented.
Machine Condition Classification by Using Wavelet Packet Decomposition and Multi-Scale Entropy
Authors: Li Hong Kun , Zhou Shu Ai , Chen Yu Zhen
Published: January 2012

A new condition classification method is put forward based on the analysis of vibration signals. Machine working condition can be recognized by the combination of wavelet packet decomposition (WPD) and multi-scale entropy (MSE). Firstly, vibration signal of machine is decomposed by wavelet packet with the appropriate decomposition layer. Then, each sub-signal in different frequency band is analyzed with the multi-scale entropy. Through analyzing the multi-scale entropy distribution curves of sub-signals for different operating conditions in each frequency band, entropy of certain frequency bands and scales will be chosen as the feature vector, which is used to distinguish different machine conditions. This method presents a novel perspective for rolling bearing default diagnosis and is tested to be very effective to classify different bearing operating conditions through series of experiments.
Second Derivative Gaussian Algorithm in Engine Fault Image
Authors: Luo Yun Lin , Liu Gui Hang , Wang Kun
Published: January 2012

In this paper, we proposed an improved Second Derivative Gaussian (SDG); the endoscopic image of the engine fault was treated by a combination of wavelet and improved SDG, in order to enhance the quality of the image and denosing. The results shows that the propose method can reduce the noise and improve the detail of the image. Provide support for further diagnosis.
Experimental Study of Micro Mill-Grinding Process on Al 6061-T6
Authors: Cheng Jun , Gong Ya Dong , Liu Yue Ming , Yang Jian Yu
Published: January 2012

This paper presents a novel micro machining process that micro mill-grinding by combining micro-grinding and micro-milling. The principle of micro mill-grinding has been analyzed and a experiment is designed to study the influences in micro mill-grinding process on Al 6061-T6. The manufacturing is carried out on a desktop micro machine developed by NEU. In this research, analysis from results could found that the surface quality influences in micro mill-grinding is complicated affected both by milling and grinding, and conclude aspects such as cutter diameter, feed rate and material properties.
Analysis of Flow Field for Link Rod Butterfly Valve
Authors: Ma Xue Dong , Teng Jie
Published: January 2012

The link rod butterfly valve relies on the link mechanism inside the flow channel to realize opening. The flow within flow channel is complex and the flow state is uncertain, so that pressure load of the flow part can't be determined in the butterfly valve designing, and strength of the parts can’t be calculated accurately and the thrust of the hydraulic cylinder can't be determined accurately. Therefore, it is necessary to carry out flow field analysis. In this paper, by adopting the plug-in COSMOSMotion of Solidworks software, the link rod butterfly valve with DN1800 is carried on motion simulation, determining the specific opening. And then the butterfly valve at different opening is carried out the finite element analysis of the flow field, adopting the plug-in COSMOSFloworks of Solidworks of software. The result shows that: the force is the largest when the valve plate is in just opening, it is 230731N, the strength analysis of the flow part and selection of the hydraulic cylinder should be based on the working condition; When full opening, the upward force on the valve plate is 18504N, this force is the power source when the valve plate is over opening. The above mentioned work provides a reliable theoretical basis for the strength calculation and the force and energy parameters calculation of the link rod butterfly valve and the theoretical reference for flow pattern evaluation of the link rod butterfly valve.
Finite Element Modeling and Dynamic Analysis of Rotating Disc and Drum Connected by Bolted Joints
Authors: Qin Zhao Ye , Wang H.Y. , Chu Fu Lei
Published: January 2012

The disc-drum type rotors are commonly used in large gas turbine engines. In this paper, the dynamic characteristics of single stage disc-drum structure are studied based on the finite element model, where the connecting bolts are modeled using solid elements and the frictional contact at the joint interface is accommodated. In order to evaluate the nonlinearity resulting from the bolted joints, a finite element (FE) model fixing the disc and drum together is also established, and the simulation results based on the two models are compared. The effects of the bolt preload and the rotating speed on the dynamic characteristics of the disc-drum structure are also discussed. The works proposed in this paper help to enhance the understanding of the dynamics of the disc-drum type rotor.
Finite Element Analysis for Whole Machine of Link-Type Ladle Turret
Authors: Li Ling Ling , Xu Guang Pu , Cui Bing Bing
Published: January 2012

The mechanism withstands 220t high temperature molten steel. In case of damage, molten steel pours. There will be major security incidents. Therefore, it is necessary to calculate carrying capacity of the mechanism. However, the part of components of the mechanism is made up of a crisscross of steel plate. This is used to withstand the bending and stretching. If we rely on traditional mechanical analysis, a large number of simplifying must be adopted, and accuracy of the calculation can be reduced. Therefore, this paper uses the COSMOSWorks Plug-in of SolidWorks software to carry out finite element calculation of whole machine for the mechanism. It avoids these shortcomings mentioned above. And this makes bearing capacity calculation to be more close to the actual circumstances. And the results show that: (1) the maximum stress of parts in the mechanism is only 52.8Mpa and much less than permissible stresses of its materials. As a result, the mechanism has sufficient bearing capacity. (2) The maximum displacement of whole machine is 2.637 mm. And the displacement will cause dip angle when lifting molten steel and it is less than its allowable stiffness. Therefore, the deformation is to meet requirements for the mechanism. In conclusion, the finite element analysis of the whole machine avoids complex force analysis and simplification of structure. The calculation has high accuracy. It is one of effective methods in the design of intensity and stiffness of complex structures.
Study on Dynamic Response of Assembly Type Gear-Rotor System
Authors: Dai Ji Shuang , Zhang Peng , Li Chao Feng , Wang Bo , Wen Bang Chun
Published: January 2012

The dynamic model of a rotor system of assembled compressor is established. Based on the single axis analysis, and considering the tilting-pad bearing stiffness characteristics with speed variations, the paper analyses whole system’s nature characteristic with gearing mesh factors. It mainly expands with the form of amplitude-frequency drawing and spectrum charts, and examines the dynamic response with each key position of coupled systems under the two working conditions. The results show that, because of the existence of gear meshing effect, Low speed axis and high-speed axis in the corresponding speed shaft appeared a few larger vibration amplitudes, at high speed axis add unbalance force, can arouse resonance of this axis in the first two order critical speed, but in the other axis don’t have obvious display.
Free Vibration of a CLD Combination Cylindrical Shells
Authors: Ren Hong Jun , Wang Bo Ping , Song Xu Yuan , Han Qing Kai
Published: January 2012

Based on elasticity plate theory and the theory of viscoelasticity, the solution of the natural frequency and dissipation factor are given under different boundary conditions. In this paper, the differential equation of the cylindrical shells is set up based on Love shell theory. Then the transfer matrix method is introduced to calculate the entirety transfer matrix and the expression of different frequency and dissipation factor. At last the natural character of CLD cylindrical shell under two different boundary conditions is researched.
Reliability Analysis and Motion Simulation of Steel Coil Upender Clamp
Authors: Jiao An Yuan , Wang Feng Hui
Published: January 2012

A kind of new steel coil upender clamping device was designed. The model was set up by use of SolidWorks and the reliability analysis and motion simulation was further performed in ADAMS. Because of risk at steel coil upender, once the accident appears, it gently slowed-up production and damaged the device, and it could cause people’s dying vitally, it is especially important to assure the longtime work and safety of device which we studied on. The results showed that the efficiency of turnover process of the device was high and the system could save driving force. These also provided some theory bases for the design of the device.
Analytical Solution for Free Vibration of Multilayered Circular Plate
Authors: Ren Hong Jun , Song Xu Yuan , Han Qing Kai
Published: January 2012

An analytical solution is deduced for a three-dimensional transversely isotropic axisymmetric multilayered circular plate made of piezoelectric (PE) and piezomagnetic (PM) under simply supported boundary condition. The state space vector, finite Hankel transform and propagation matrix methods are utilized together to obtain the full-field solutions for the multilayered circle plate. Numerical examples for five-layered PE/PM composites with dimensionless frequencies of the multilayered plate under simple-supported lateral boundary conditions are presented. The frequencies increase with the ratio of the thickness to radius.
Safety and Reliability of Carbon Nanotubes in Nanoactuator Application
Authors: El-Hami Khalil , El Hami Abdelkhalak
Published: January 2012

This paper presents a nanoactuator device as new model of the nanocomposite application. The carbon nanotube was incorporated in the polyvinylidne fluoride and trifluoroethylene P(VDF-TrFE) copolymer matrix. The P(VDF-TrFE) was chosen for its three characteristics which is ferroelectric, piezoelectric and pyroelectric to convert directly the electrical excitation to the mechanical motion (deflection). The SWCNT/P(VDF-TrFE) nanocomposite nanostructure is proposed as nanomaterial challenge to build a nanoactuator and drive systems in nanometer scale size. A deflection the SWCNT of about 10 picometer was found using the atomic force microscopy technique combined with lock-in-amplifier. And in this paper, we present a new method based on Optimal Safety Factors (OSF) in the context of the Reliability-Based Design Optimization (RBDO) analysis of of Carbon Nanotubes in Nanoactuator. We will underline also the different methods of the RBDO analysis and we highlight the advantage of our approach. Numerical results are given to illustrate the proposed method.
Impact Depth on Glass Surface Caused by Sand Particles
Authors: Bouzid S. , Azari Z.
Published: January 2012

Brittle materials in general and particularly glass are very sensitive to dynamic particles impacts of different nature. The ancient objects in glass (building, monuments) and some precious objects are subjected to atmospheric aggressions such as humidity, sand particles, hail,…etc.). Their surfaces are however, often exposed to severe climatic conditions in an environment where the sand wind is a daily phenomenon or beach wind. Many degradation processes due to erosion affect significantly surfaces of buildings that are part of the Cultural Heritage.
Behavior of Reinforced Concrete Beams by Confined Oblique Rods
Authors: Taouche F. , Ait Tahar Kamal , Hannachi Ne
Published: January 2012

The specific objectives of this study are: verifying the applicability of the proposed method of reinforcement of the beams by oblique connecting rods confined by a metallic embedded grid material to improve the behavior of concrete from the point of view strength to shear force, and confronting the experimental results acquired with empirical formulas developed by other researches.
In this study, experimental investigations were performed to evaluate performance characteristics such as flexural ductility, resistance to shear force and load capacity.
The experimental and numerical studies in the present work represent a promising revelation regarding the effectiveness of the proposed reinforcement process by an oblique connecting rods confined by a embedded metallic grid material laid out in the zone of influence of the shear force tilted to 45°. The confrontation of the experimental and theoretical results shows a satisfactory agreement.
Effect of Artificial Defect and Mean Shear Stress on Torsional Fatigue Behaviour
Authors: Nasr Anouar , Nadot Yves , Bouraoui Chokri , Fathallah Raouf
Published: January 2012

The aim of this work is to study the influence of artificial defect and mean stress on fatigue strength under torsion loading. Spherical artificial defects have been machined at the surface of gauge length of fatigue samples. Experimental investigations conducted on both defective and defect free materials. The crack initiation mechanisms have been identified based on several observations on Scanning Electron Microscope (SEM) at different stage of fatigue life. It is observed that the defect free material subjected to torsion loading allows relatively earlier initiation. Experimental results show that mean shear stress has no effect on fatigue behaviour under torsion loading. It is also concluded that defects are much more damaging in high cycle fatigue regime than in low cycle fatigue one.
Singular Perturbation Method for Solving Non-Linear Vibration of Stay Cable (I) - Theory Research
Authors: Ran Zhi Hong , Qu Jun Tong , He Fei , Miao Sheng
Published: January 2012

In order to solve the difficult in calculating cable vibration, the non-linear dynamic model of cable was set up with geometrical non-linearity. The differential equation was solved using the singular perturbation method. The analytical expression of frequency and form function was deduced. The expression can be widely used for the field of measurement of cable force and identification of parameter in cable structure.
Fatigue Evaluation of Flat Steel Box Girders with Closed Stiffeners of Large-Span Suspension Bridges under Different Heavy Trucks
Authors: Zeng Yong , Tan Hong Mei
Published: January 2012

Due to its outstanding aerodynamic shape and light weight, the trapezoidal cross-section flat steel box girder with orthotropic decks and thin-walled longitudinal stiffeners of trapezoidal cross section are widely used in long-span suspension bridges in the world. However, because of the geometrical characteristics and the relative flexibility of their components, these structures may be quite susceptible to traffic loadings that fatigue cracks tend to appear in these structures. In this paper, Jiangyin Bridge is used as a case study to investigate the fatigue performance of the steel girders of suspension bridge Jiangyin Bridge is the second longest bridge in China, which has the main span of 1385m. The stress analysis of steel box girders is firstly carried out based on the analysis of fatigue life. Fatigue assessment method is proposed on the basis of in-situ measurement data combined with finite element analysis. A complete fatigue assessment is made in this paper. Key words: flat steel box girder; orthotropic decks; finite element analysis; fatigue assessment
Strengthening of Concrete Beams Having Shear Zone Openings Using Orthotropic CFRP Modeling
Authors: Mahmoud Ashraf Mohamed
Published: January 2012

A finite element reinforced concrete model has been analyzed by the author with ANSYS 9 finite element program for both unstrengthened and CFRP-strengthened beams using concrete element model 25x25x25mm and discrete and smeared steel distribution with openings exist. The CFRP has been modeled using Solid46 element, which has orthotropic properties. The deflection results have been compared with an experimental and other finite element model which are performed by Mohamed [4], in which using 100x42.5x42.5 mm concrete element, smeared steel distribution with the same opening sizes, and modeling CFRP with ANSYS 5 finite element program using Link10 element which has a uniaxial properties. These results show that the author's model is much better than the Mohamed's [4] model comparing with the experimental one. A parametric study has been done on the proposed model for obtaining the maximum strains values for concrete and steel at failure loads, for different opening sizes and comparing them with the experimental one. This study show a good agreement between the proposed and experimental model results for strains values which indicate the efficiency of the proposed model for analyzing the unstrengthend and strengthened reinforced concrete beams.
Settlement of Foundations Located on Compacted Soil for TMM Projects
Authors: Masoud Oulapour
Published: January 2012

Among the policies accepted in housing development is forming a large number of cooperative construction companies named Taavoni Maskane Mehr (TMM). Due to lowland type of the grounds some few meters, up to 4m, of compacted backfills are proposed in order to raise the elevation of such areas of such areas. In this research a set of data of compaction and consolidation tests are used for studying the situation in one of these projects named Haftkel project. In this regard the consolidation and settlements due to inundation of area are calculated. The results show that the condition of the project is well enough.
Risk Matrix for Factors Affecting Time Delay in Road Construction Projects: Consultants’ Perspective
Authors: Mahamid Ibrahim
Published: January 2012

The aim of this study is to identify the risk matrix for factors causing time delay in road construction projects in the West Bank in Palestine from consultants’ viewpoint. Three zones were used in the matrix according to the degree of factors severity on the projects’ time delay; which are: green, yellow, and red. The analysis of 43 factors considered in a survey indicates that 2 factors are located in the green zone, 28 factors are located in the yellow zone, and 13 factors are located in the red zone.
Using of Furfural to Modify the Ordinary Portland Cement
Authors: Hussain Haleem K. , Wei Liu Gui , Hamdi Hameed A. , Abed Dawood S.
Published: January 2012

This study reported the results of adding furfural on mechanical properties of Ordinary Iraqi cement. Furfural was used at four different ratios (1%, 2%, 3%, and 5 %) by weight to the mix of Iraqi Portland cement (Um- Quasar factory cement). The effect on the plasticizing and fluidity by table flow test for cement paste and slump test of fresh concrete were studied. The obtained results showed that added furfural is acting as super plasticizer. Effective relation was found between fluidity and ratio of added through effecting time of flow where the most effect additive ratio was found to be 3% .The radius of cement paste circle is linearly dependence which is a indicate of high workability. Obtained results explained in term of electrical charges on cement particles. Also found that adding furfural increasing the dispersion work between cement paste particles and preventing coarse agglomerated. The using of furfural with concrete indicates two kinds of concrete behavior. These behaviors were strongly dependence on furfural ratio .The critical value of added furfural was 1% and after which a plasticizing effect obtained. Splitting and flexural tensile test were conducted. Three types of curing methods include dry, moisture and water curing. The obtained results showed that the moisture curing was better than other curing methods due to good results obtained with splitting tensile (6.18 N/mm2) for 5% ratio and water curing is preferred for flexural tensile (7.05 N/mm2 at 2% wt% of furfural ). Finally, we compared our results with AL-Abraaj Kuwait cement and we found that the Iraqi cement (Um Quasar factory cement) was better.
The Economics Analysis of Large-Scale Project Organization
Authors: Chen Yong Hong , Xu Ning
Published: January 2012

Large-scale projects have the features that large organization size, complex relationships between the organization and a serious information asymmetry between project participants. This study carries out in-depth economic analysis about large-scale projects organization, based on principal-agent theory and transaction cost theory from the perspective of new institutional economics, at the same time, establish the economic theoretical framework, it has positive significance to the rational design of the project contract and scientific analysis of the construction economic relations.
Analysis and Inspiration on Typical Damage Characteristic of Bridges
Authors: Zhang Wen Xue , Yang Lu
Published: January 2012

Through analyzing the typical damage characteristic of bridges and corresponding earthquake disaster data in several destructive earthquakes at home and abroad, the law of earthquake damage on bridges has been summarized. Aiming at current aseismatic research and design of highway bridges, further research direction in the field of bridge seismic has been pointed out. In order to improve the seismic behavior of future bridges, some design points to attention have been proposed based on seismic conceptual design and aseismic measures of bridges.
Comparing Steel Plate Shear Wall Behavior with Simple and Corrugated Plates
Authors: Gholizadeh M. , Yadollahi Y.
Published: January 2012

Experimental and numerical studies conducted in the past three decades have demonstrated that a steel plate shear wall is an effective and economical lateral load resisting system against both wind and earthquake forces. The system consists of infill steel plates connected to boundary beams and columns over the full height of the framed bay. The infill plates can be stiffened or unstiffened and the beam-to-column connections can be rigid or shear connections. A properly designed steel plate shear wall has superior ductility, high initial stiffness, stable hysteresis loops, and good energy absorption capacity. These characteristics make the system outstanding in high-risk seismic regions. Use of steel plate shear wall systems has been shown to be more cost effective than the other lateral load resisting systems. Steel plate shear walls are much lighter than the commonly used reinforced concrete shear walls, which reduce both the gravity loads and seismic forces. This aspect significantly reduces the foundation costs and makes the system outstanding for application in rehabilitation projects. Whereas construction cost of stiffened steel plate shear wall is more than unstiffened steel plate shear wall therefore in this investigation the unstiffened steel plate shear wall has been studied as two types of simple and corrugated plate and the behavior has been compared in one story frame. This study was conducted with finite element approach theoretically. The results of this study demonstrated that behavior of corrugated plate is superior to simple plate because it has high loading capacity, ductility and energy absorption.
The Use of Stress Reduces in suddenly Changed Section of Rounded Shafts
Authors: Mohebpour S.R. , Vaghefi Mohammad
Published: January 2012

Reducing stress concentration is mainly done by fillets. However, new concepts toward better material properties lead designers and engineers to use these materials in their design, still changing in geometrical shape of desired models can help us in reducing stress concentration factors. New devices, including fast computers, reliable numerical methods (FEM), and numerical optimization approach can bring special devices for better designing besides considering design limitations in special industries. In this paper we focus on geometrical change (rounded groove) in the sudden changed section of the rounded shaft to reduce stress concentration in the most dangerous section. By optimizing this proposed change in the geometry of shaft we reduce the stress, so using of fillets can be neglected in the future designs to prevent metallurgical and design limitations.
Three Dimensional, Linear and Nonlinear Finite Element Modeling of FRP to Concrete Pull-Off Test
Authors: Hamedani Majid Noori
Published: January 2012

External bonding of fiber reinforced polymer (FRP) sheets to concrete is a popular method of strengthening reinforced concrete (RC) structures. A simple test was set-up in order to simulate the process of debonding in this type of strengthening. The set-up is simulating the bond behavior of strengthened RC structures. In the recent researches it was found out that bond behavior and actual stress distribution is a 3 dimensional phenomenon. This paper is presenting more details about pull-off tests by applying 3-D and nonlinear finite element models. As a first step linear model has been generated to show general stress distribution in the test, in a second step nonlinear model is implemented in order to predict the behavior of pull-off tests more accurately. Tests have shown that at ultimate load, deboning occurs within a concrete layer near the bond surface. Therefore, the paper is focusing on using a more realistic concretebehavior in the model.
Application of ANSYS in the Hydraulic Generator Rotor Bracket Crack
Authors: Li Zheng Gui , Yang Feng Yu , Pu Xiao Xuan , Chen Jun Hui , Si Guo Lei
Published: January 2012

The rotor vibration of the unit is sensitive to the running conditions for the turbine group low head, high flow characteristics. It easily lead the rotor bracket of oblique arm structure to crack. The reason of rotor bracket cracks is proved by ANSYS analysis and its repair program have been identified. Running for some time after repair, the main parameters, such as air-gap and other unit operation , have been analyzed. The results are satisfactory, which verifies that the analysis of the rotor bracket crack repair is objective and reasonable.
Design of Wireless Sensor Management Platform Based on Embedded ARM
Authors: Song Yang , Wu Mu Qing , Jia Kai
Published: January 2012

Wireless Sensor Network is receiving more widely appreciate because of its great prospect. But a variety of sensors need a unified mobility management platform. This paper considers this problem, proposes and implements a wireless sensor management platform which can control a variety of sensors and transfer the collected data by using wireless technology. Then a testing wireless network is built to test the performance of this mobile platform. The test result proves that this platform has the ability of manage sensors, and has the advantages of mobility and portability.
Research on Thermal Comfort in HVAC Laboratory
Authors: Sun He Chen , Zhao Jing Ye , Wang Wen Hai , Gao Zhi Yong
Published: January 2012

According to the characteristics of the laboratory, for the condition of using air conditioning that is falling to the ground pattern to assist radiator to heat, use CFD to simulate the airflow organization and thermal environment in laboratory. Meanwhile combine with the indoor relevant measured parameters, analyze distribution characteristics and finally evaluate the thermal comfort in laboratory in winter.
Existence of Periodic Solutions for a Class of Second-Order Nonlinear Difference Systems
Authors: Tan Wei Ming , Su Fang
Published: January 2012

In this paper, by using critical point theory, a sufficient condition is obtained on the existence of periodic solutions for a class of nonlinear second-order difference systems.
Research on Robust Tracking Control Based Improved Fuzzy Disturbance Observer for Flight Simulator
Authors: Liu Zheng Hua , Yu Xiang , Hua Yue Yang
Published: January 2012

Fuzzy disturbance observer, as an outstanding feedback controller, is an effective means to improve the accuracy and bandwidth of high precision angular tracking systems. This robust controller based on the fuzzy disturbance observer(FDO) is introduced in this paper, and the method is applied to the flight simulator system together with PD controller. Compared to the traditional method of lead and lag correction or DOB controller, this novel method based on FDO can inhibit high-frequency noise and compensate low-frequency interference better, such as frictions, and achieve better precision finally.
Crashworthiness Design for Reinforced Thin-Walled Column under Oblique Impact Using a Magic Cube Approach
Authors: Yang Shu , Qi Chang , Guo Dong Ming
Published: January 2012

This paper is concerned with crashworthiness design of a reinforced thin-walled column under oblique impact. To transform the failure mode of the column under oblique loads from low energy-absorption global bending to high energy-absorption progressive collapse, Magic Cube (MQ) approach, a systematic design approach, is employed to assist the design process: by applying time (process) decomposition, the original difficult nonlinear dynamic crashworthiness design problem is converted into a sequence of simplified linear design problems; by applying multi-domain topology optimization technique to the simplified linear design problems, the optimal configuration of the reinforcement is obtained. Numerical simulation results show that, compared with the original column with same weight, the optimal reinforced thin-walled column has higher energy absorption performance and lower initial crushing force under oblique impact.
Research on Concept System of Mechanical Scaling-Translation Symmetry
Authors: Ma Zhi Yong
Published: January 2012

Scaling-translation symmetry is combined by translation symmetry and scaling symmetry, it widely exists in mechanical systems, and plays an important role in realizing the technical, economic and social performances of mechanical products. Based on the concept system of translation symmetry, and according to the research on a lot of instances, the concept system of scaling-translation symmetry classified by the directivity and alternations of symmetry components, the dimensionality and closed circle of symmetry benchmark, and the variable type of scaling was established. The concept system can completely contain all kinds of existence of scaling-rotation symmetry in mechanical systems, and can provide a theoretical basis for the further research on the application of scaling-translation symmetry in mechanical systems.
Surface Treatment and Adhesive Interface Investigation of a New Type of Aluminum Lithium Alloy
Authors: Sun Zhen Qi , Huang Ming Hui
Published: January 2012

A new type of aluminum lithium alloy Al-Li-S-4 was investigated in this paper. Process of phosphoric acid anodization and method of making bonding joint sample was introduced. Micrographs of plate surface were study by scanning electron microscopy. The pattern of aluminum alloy was modified after anodization. Plates were bonded with FM94 film adhesive and cured at 121°Cin the special clamping fixture. Morphology of bonding sample cross-section interface was investigated after bonding and curing process.
On Chip Kalman Filtering Strategy-Based for VRLA Battery Control Unit
Authors: Piao Chang Hao , Liu Ming Liang , Zhang Qiang , Liu Qi Feng
Published: January 2012

Based on existing understanding of residual capacity, the paper adopts Kalman filtering method on SOC estimation. The battery control unit(BCU) includes voltage, current and temperature sampling module. Due to Lead-Acid battery charging and discharging are a complex electrochemical process, we suggest a non-linear least squares regression method (NLLSRM) on open circuit voltage (OCV) method is proposed to aim at Lead-Acid battery. At the same time, a detailed hardware circuit schemes transfer module and on chip embedded Kalman filter method are employed. Moreover, A Local Interconnect Network (LIN) Bus Communication Technology is applied to communicate to Electronic Control Unit (ECU). Validation experimental results show that the proposed Lead-Acid BCU is high credible and the state of charge (SOC) estimation average relative error is about 3%.
Design of Marine Diesel Engine Waste Heat Recovery System with Organic Rankine Cycle
Authors: Yue Guo Qiang , Dong Shi Wei , Zheng Qun , Li Jia Rui
Published: January 2012

Being an energy-saving project with great development potential, Organic Rankine Cycle (ORC) is becoming one of the research hotspots in recent years. However, there is little research about the waste heat recovery with Organic Rankine Cycle on ships as yet. In this paper, the marine diesel engine waste heat recovery system with Organic Rankine Cycle was designed and analyzed. Isopentane was used as working fluid in the Organic Rankine Cycle. The conditions for the system to recover marine diesel engine waste heat were given, and its schematic diagram was provided. Finally, the ORC turbine which is the most important components of the system was designed. The numerical simulations of the ORC turbine were carried out by using the CFD program. The operation performance and flow field were analyzed.
Effect of High Pressure Carbon Dioxide Fluids on the Birefringence of Polymer Optical Fiber
Authors: Zhao Chuan , He Jang Ping , Xing Jan Wei , Kenji Hisada , Hori Teruo
Published: January 2012

In this paper we report a method for reduce the birefingence of polymer optical fiber by using high pressure carbon dioxide fluids. Polymer optical fiber, in the manufacturing and forming process, it is effected by the external drawing and cooling so that the optical fiber presents exhibit birefringence. The experimental result shows that after the treatments of carbon dioxide fluids, the birefringence of optical fiber drop from 2-2.1×10- 4to 4.1-4.6×10- 5.
The Research on Production Operations of Job Shop Based on eM-Plant in Simulation
Authors: Zhao Min , Zhao Xiao Xu , Zhang Yun Feng
Published: January 2012

In this paper the important meaning of the system simulation in improving enterprise especially for discrete manufacturing is understood. Method of the design of processing workshop facility layout and specific implementation steps can be proposed by further in-depth study of the SSLP. I use eM-plant simulation optimization software for analysis to reduce he workshop production organization management and operating costs effectively. And it could use the analysis method of Bottleneck Analyzer to make statistical analysis. The paper puts forward effective feasible method in planning to layout of stone processing workshop for facilities, and making the logistics park to efficient, low cost operation [1, 2].
Tribological Behavior among Piston Ring -Hydrorefined Mineral Oil- Cylinder Liner for Diesel Engine
Authors: Shen Yan , Xu Jiu Jun , Jin Mei , Wang Jian Ji , Wang Liang , Han Xiao Guang , Zhang Hong Peng , Zhang Yin Dong
Published: January 2012

With a piston ring reciprocating liner test rig, the tribological behavior at top dead center of diesel engine was evaluated between hydrorefined mineral oil (HMO) and two kinds of cylinder liner/piston ring, chromium-plated+honing/physical vapor deposition (CP/PVD) and boron-phosphrous alloy cast iron+honing/physical vapor deposition (CI/PVD). Friction coefficient vs. temperature at different loads was used to discriminate the principal function of tribofilm. The analysis shows that the interface between CP/PVD and HMO was subject to thin film lubrication with stearic acid at 70-150°C. When the temperature exceeds 150°C, zinc dialkyl dithiophosphate (ZDDP) began to change the friction status of interface. However, the steady boundary lubrication of CI/PVD exists from 50—250°C at different loads and can not distinguish the scope of additives effects. The reason can be attributed to the chemical reactivity of chromium and iron with the HMO. The soluble Fe2+ or Fe3+ of CI/PVD maybe played an important role in the tribofilm activation level. The understanding provides friction pairs selection at definite lubrication oil and a design guideline for boundary films.
Study on Relationship between Paper Performance and Ink Transfer Based on Quality Control
Authors: Chen Wen Ge
Published: January 2012

The difference of printing quality depends on the transfer of ink and paper performance.In this paper based on the theory of printing.Measuring the performance of all sorts of paper,with IGT-C1 type printability tester to simulate the printing principle.In the same printing pressure,printing speed and ink,under the conditions of constant temperature and humidity.Using different paper type experiment,obtained paper all kinds of performance and ink transfer data.Then processing, analysis,and obtained paper performance and ink transfer rate relation curves of in printing pressure and the printing speed with constant.For the printing quality control to provide certain basis in the different performance of paper.
Advancement of Aluminum-Water Reaction and Application
Authors: Zhu Rui , Zhang Zhen Shan , Liang Wei Ge , Shan Xiao Liang An
Published: January 2012

The technology of applying aluminum-water reaction to underwater vehicle is analyzed combining with the energy identity of metal fuel and different aluminum powders. The present research situation and development foreground are studied.
Phases Evolution and Y Solid Solution Microstructure in the Mg-6Zn-3Y Alloy Solidified under Super-High Pressure
Authors: Dong Yun , Lin Xiao Ping , Zheng Run Guo , Jiao Shi Hui
Published: January 2012

The solidification microstructure of Mg-6Zn-3Y alloy under super-high pressure was investigated by using X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the dendritic structure of Mg-6Zn-3Y alloy under super-high pressure (GPa level) can be evidently refined with the increase of solidification pressure. When the pressure increases to 2 GPa, Y element can’t solubilize in matrix of a-Mg, the primary Y solid solution is distributed in the shape of polygon block in the matrix. When the pressure is up to 4 GPa, the primary Y solid solution appears as symmetrical petaline shape. So Y solid solution exhibits the different morphology with the change of the pressure
Numerical Simulation for Groundwater-Source Heat Pump Engineering Disposing Wells Scheme in the Coastal Region
Authors: Pan Jun , Liu Chang , Li Yang
Published: January 2012

For analysis the MOMA FengHui residential of BaYuquan area ground- water source heat pump engineering on the influence of seawater invasion，Established the groundwater flow and solute transport and temperature coupling numerical model，Simulated forecast the change tendency of the groundwater flow and solute and temperature of two different disposing Wells scheme. Simulation results show that the two kinds of disposing Wells solutions are not cause seawater invasion, the second disposing Wells scheme help to prevent the occurrence of seawater invasion.
A Novel Robust Smooth Support Vector Machine
Authors: Sun Shao Chao , Huang Dao
Published: January 2012

In this paper, we propose a new type of ε-insensitive loss function, called as ε-insensitive Fair estimator. With this loss function we can obtain better robustness and sparseness. To enhance the learning speed ,we apply the smoothing techniques that have been used for solving the support vector machine for classification, to replace the ε-insensitive Fair estimator by an accurate smooth approximation. This will allow us to solve ε-SFSVR as an unconstrained minimization problem directly. Based on the simulation results, the proposed approach has fast learning speed and better generalization performance whether outliers exist or not.
Synthesis and Characterization of TiO2 Thin Film by Self-Assembly Method
Authors: Mu Wen Ning , Shi Shuang Zhi
Published: January 2012

TiO2 thin films were deposited on SAM-coated silicon substrate by layer-by-layer self-assembly method. The influence of various parameters was investigated to optimize the conditions and the results show that with increasing deposition temperature and deposition time, and decreasing molar ratio of HCl to TiO22+, the content of TiO22+ in the reaction solution decreases. The as-deposited thin films were fully amorphous from the result of XRD, also were homogeneous and continuous produced at 80 °C for120 min as presented in SEM images, and the average size of particles on the thin film surface is approximately 33 nm.
A Study on Economic Analysis of HOQ
Authors: Cao Yan Long , Zhao Kui , Yang Jiang Xin , Guan Jia Yan , Li Bo
Published: January 2012

This paper put forward the concept of economic house of quality (EHOQ), constructing EHOQ model based on quality economic analysis. The proposed method expands the 10-steps model of traditional house to a new 13-steps model via introducing three new steps which are growth rate of customer cognitive price, annual increment of quality comprehensive cost and enterprise expected revenue to carrying out the economic analysis on HOQ. The new method breaks the limitations of traditional quality function deployment (QFD) construction without revenue analysis.
A Machining Method of Sculptured Surface Based on the Quad-Tree Partition
Authors: Fan Li Cheng , Zhang Feng Feng
Published: January 2012

The STL (Stereo Lithography) model is based on the triangular facets of 3D surface description model. This article studies the processing cutter path calculation of the STL model sculptured surface manufacturing: It proposes the full grid quad-tree partition method for surface of the triangular grid model. The sculptured surface is classified by quad-tree partition with projection plane for cutter location point calculation to give a fast search algorithm. Take tooth surface for example, the feasibility of the algorithm is verified according to the study of cone-shaped cutter tool path generation algorithms and also by the grinding test.
Influence of Cutting Speed on Plastic Deformation in Machined Surface of FGH95 PM Superalloy
Authors: Du Jin , Liu Zhan Qiang
Published: January 2012

FGH95 nickel-based superalloy is produced by powder metallurgy (PM) processing for aerospace applications. Due to lower thermal conductivity, work hardening tendency during machining, and intensive adhesion to the surface of the tooling under operation, machining of FGH95 alloy is a significant challenges. The FGH95 machining process will induce substantial amount of plastic deformation in the surface and subsurface of the workpiece. A theoretical model is developed to predict the plastic deformation in machined surface of FGH95 superalloy. Experimental results are also applied to analyze the influence of cutting speed on plastic deformation in machined surface of FGH95. It is found that cutting speed has significantly effect on the plastic deformation in the machined surface. The increasing the cutting speed creates severer plastic deformation. Surface plastic shear strain increases with the increases of cutting speed, while the depth of plastic deformation decreases contrary.
Complex Impedance Matching for Power Improvement of a Circular Piezoelectric Energy Harvester
Authors: Wang Hong Yan , Shan Xiao Biao , Xie Tao
Published: January 2012

The impedance matching and the optimization of power from a circular piezoelectric energy harvester with a central-attached mass are studied. A finite element model is constructed to analyze the electrical equivalent impedance of the circular piezoelectric energy harvester. Furthermore, the complex conjugate matching load is used to extract the maximum output power of the energy harvester. The power output from complex conjugate matching load is compared with the power output from the resistive matching load and a constant resistance, separately. The results suggest that the complex conjugate matching can result in a significant increase of the output power for all frequencies. The effective bandwidth of the piezoelectric energy harvester is extended significantly.
Investigation on Temperature Field and Thermal Stress of Dish Solar Concentrator’s Focal Region
Authors: Wang Xing Zhi , Shuai Yong , Wang Fu Qiang , Yu Chun Liang
Published: January 2012

Depending on the solar radiant flux and velocity measured in Harbin, with finite element method, use a modified radiant heat flux function to calculate the temperature field of a plate on the focal region of a dish solar concentrator. Compared the result with picture taken by infrared camera, there is a good accordance between them. The temperature field is used as the loading parameters to calculate the thickness’s impact on the thermal stress field in the plate. When the value of the thickness increases, the maximum values of the stress increase, but the overall stress field tend to decrease.
Research on Expansion Alloy Grain Growth Tendency
Authors: Yan Feng , Yu Ke Qiang
Published: January 2012

4J29 is a typical of expansion alloy and used as sealing glass material and structure material in transistors, integrated circuit devices manufacturing industry. This article adopts heat-treatment experiments and single factor optimization method to study the relationships of recrystallization temperature, beforehand deformation and grain sizes on 4J29 alloy; then discusses the reason why the coarse grain phenomena appear and gives technological measures to improve the quality and performance of workpiece
Finite Element Study of the Windage of Suspension Insulator String under Steady Wind and Gust
Authors: Li Bo , Luo Shan , Zhang Zhou Quan , Lu Dong , Yang Ming Ming
Published: January 2012

Considering the drawbacks exist in the traditional computational methods, we introduce a finite element method to analyze the windage of suspension insulator strings under the effects of dynamic and random wind loads. The windage of suspension insulator strings in the high voltage transmission line and influenced by static and random wind loads are simulated by using the finite element software. The result shows that the windage of suspension insulator strings subjected to the random wind loads is greater than the counterpart obtained through the statics methods.