bluuebunny/crossref_metadata_2025 huggingface dataset:
Wind-Induced Vibration Control for Transmission System Using Steel-Lead Viscoelastic Damper
Authors: Gan Feng Lin , Jiang Hai Long
Published: July 2014

For wind-induced vibration of transmission tower-line system, the vibration reduction effects are studied based on a new type steel-lead viscoelastic damper. Firstly, Calculate damped coefficient basing on the test of the new type steel-lead viscoelastic damper under slow reversed cyclic horizontal loads. Then, a finite element model of transmission tower was built by using ANSYS. And the time history samples of random fluctuating wind load is obtained with the linear auto-regressive filter law principle. Next, three installation plans of dampers on tower were proposed based on analyzing the working principle damper and the structure of tower. Finally, a wind-induced vibration transient response simulation was performed respectively for the different plans. The influences of SLVD dampers on the displacement and on the acceleration of the controlled nodes were compared. SLVD damper can reduce the top node displacement by about 37.89%. The results indicated that the SLVD damper can suppress the wind-induced vibration. And through comparison, the optimal installation scheme of SLVD dampers is obtained.
The Application Research of Non-Nuclear Density Gauge Electromagnetic Technology in the Road Engineering
Authors: Chai Jin Ling , Wang Yong
Published: July 2014

In order to ensure the control degree of compaction and meet the design requirements in the process of asphalt pavement construction, reduce the core detection for the damage in the late. It using non-nuclear density gauge to test density, and carries on the comparative analysis with the density of core test data or conversion degree of compaction data, then study the variation regularity of after the calibration for field dynamic control compaction with the roller compaction times, Conclusion non-nuclear density gauge control accuracy and error causes in the asphalt layer compaction testing. Experiment results show that non-nuclear density gauge must be proper calibration, which according to different structure layer, gradation type and different materials and core calibration method test values. At the same time suggest appropriate to increase the number of calibration for 10~15 points, which reduce error and test error for choosing, make its accuracy of control within 2%. The conversion relationship between detecting the density and the water method to testing compaction were emphatically studied, this provides a basis for non-nuclear density gauge effective application in the field compaction test grade road asphalt layer.
Dynamic Control of Gait and Posture Training on Robot
Authors: Chen Chih Chen , Ciou Shih Hsiang , Hwang Yuh Shyan , Chen Yu Luen , Chen Sheng
Published: July 2014

In the research, a robot with gait and posture training functions is developed as an interactive balance rehabilitation training system for balance control impaired people to use. The system uses an action control tool with braking and monitoring functions to obtain the dynamic posture and gravity position of the body of the trainee, followed by subsequent process with software which is developed and designed completely to generate related feedback instructions for the trainee. Moreover, the instructions are presented in image, audio and tactile feedback manners, such that the trainee is provided with multiple message instructions to perform training activities according to the action request actually. Clinically, the research may provide training contents oriented according to task need. Compared to the decomposed action approach emphasized in conventional rehabilitation, it does allow the trainee to focus on the activity and obtains more significant effect. Furthermore, the goal of falling prevention function is also achievable after trained by the robot with gait and posture training functions developed in the research.
Novel Strengthened Structure of Stair-Climbing Robots on Campus
Authors: Wang Ching Kuo , Wu Yi Hsiu , Cheng Yu Shiu
Published: July 2014

The riding comfort and the maneuverability play increasingly important roles in the development of the moving platform of manned robots. The escaping dynamics and the sensor-based automation have been topics in the issues of the automobile industry since 1995’s. It occurs when the vehicle slips away from its prescribed trajectory during braking or cornering. This paper is to construct an intelligent controller to avoid escaping phenomenon for the wheeled and the caterpillar robot platforms. The proposed algorithm is focused on modeling, analysis, and control of nonholonomically vehicle dynamics on the geometric point of view. The stratagem of the anti-lock braking system (ABS) is to navigate the cornering dynamics using the intelligent controller, which successfully integrate a fuzzy-logic controller and multi-stage electronic sensors. Finally, dynamic simulations and experiments of a sensor-based prototype are made to justify the performance of the proposed algorithm.
Computer Aided Design of a New Universal Clamping Mechanism
Authors: Li Jeremy Zheng
Published: July 2014

The tooling and fixture play important roles in manufacturing and production. It affects both product quality and quantity. Better tooling and fixture can also promote cost-effective manufacturing process. This paper introduces a new type of universal clamping mechanism based on computer-aided 3D modeling, engineering structural analysis, and prototype testing. It can be applied to easily and reliably clamp different geometrical shape of work pieces per user requirements. This new clamping mechanism, with less moving components, can assist manufacturing industry for high speed production, easy part handling, precise clamping, and lower tooling cost. Keywords: Computer-aided design, automated production, 3D modeling, cost-effective, high speed manufacturing, engineering analysis, optimization, efficient;
Experimental Study of Corrosion Sensors for the Design Technology of Bridge Longevity
Authors: Jeong Jin A
Published: July 2014

Corrosion of steel reinforcement is a major factor in the deterioration of harbor and bridge structure. Steel corrosion in concrete must be checked for investigating the condition of a reinforced concrete structure. The several way how to measuring corrosion condition of reinforced concrete, but the corrosion potential measurement is a very simple, rapid, cost-effective and non-destructive technique to evaluate the severity of corrosion in reinforced concrete structure. However some particular situations may not relate to the reinforcement corrosion probability and a simple comparison of the corrosion potential data with the ASTM Standard on steel reinforcement corrosion probability could prove meaningless because of environment factors as oxygen concentration, chloride content, the concrete resistance. Therefore this paper proposed compact designed corrosion sensors to monitor several corrosion factors, and the electrochemical measurement and evaluation have been carried out to investigate rebar corrosion, and a reasonable prediction of corrosion has been obtained in terms of nondestructive electrochemical point of view.
A Theoretical Study of the Phase Angle for the β Type Pulse-Steam Stirling Expander
Authors: Lai Guang Jer , Lin C.K. , Kobayashi Yoshiyuki , Matsuo Masahiro , Chiu Min Chie
Published: July 2014

This paper introduces a small steam expander linked to a moderate/small industrial steam boiler to form a small scale cogeneration system for the purpose of energy conservation and carbon-emission reduction. Here, a traditional regulator will be replaced by the steam expander. In order to effectively extract the high pressure steam’s unused energy (flow energy) from the boiler, the steam will be induced into an expanding process. Here, a Pulse-Steam Stirling Expander (PSSE), which is different from a normal steam expander, is proposed in the study. In order to decrease the steam condensation and increase the overall output power, the PSSE expander adopts an isothermal process instead of the traditional isentropic process. The PSSE cycle, which is composed of an isothermal process and an isovolumetric process, is similar to the Stirling cycle. Therefore, considering the influence of the valve’s opening/closing within the PSSE cycle and adopting the Stirling engine’s Schmidt theory, the mathematical model of the PSSE cycle has been established. The characteristic analysis of the PSSE expander has been assessed based on the mathematical model. Moreover, a prototype of the PSSE expander has been constructed and tested. According to theoretical analysis and experimental data, the output power for the PSSE expander is closely related to the phase angle between the displacer and the piston. Consequently, the mathematical model of the PSSE expander proposed in this study can be applied to design the practical PSSE expander in industry.
Damage Identification of the Blade Based on Distributed Fiber Bragg Grating Sensors
Authors: Zhang Yan Hui , Yang Wen Yu
Published: July 2014

As the foundation work of the damage identification for the blade, the purpose of this paper is to determine which parts of the blade are more sensitive to the damage and how serious damage could affect the dynamic response of the blade structure. Several damage states are simulated using the magnets, and then the distributed fiber Bragg grating sensor system is used to measure the dynamic strain response of the blade under the random excitation. The dynamic strain time domain signal is first analyzed, and then the different damage states are identified. In order to eliminate the adverse affect of the environmental and operational variations, the Hilbert-Huang Transform method is used to extract the damage-induced signal component. Lastly the damage index based on the autoregressive model and Mahalanobis distance method is constructed to detect damage. Some conclusions are obtained from the experimental results.
Fault Diagnosis of Mechanized Bridge’s Electrical System Based on I2C-bus and Virtual Instrument Technology
Authors: Sun Yong Sheng , Yang Xiao Qiang , Pei Li , Yan Sun
Published: July 2014

The electrical system fault testing and diagnosis system based on I2C-bus and embedded equipment is proposed. This system is accomplished with the integration of PXI-based computer, field fault testing platform, dedicated interface adapter unit and accessories with software program of virtual instrument and database management and fault guidance system. It can obtain various state parameters of the heavy mechanized bridge by interface adapter unit and corresponding sensors. The dedicated interface adapter unit, that is the core of the hardware platform is composed of chassis, embedded microcomputer controller, I2C-bus data acquisition modules, VPC connection package and military aviation sockets. Because of its flexibility and modular design, it can support different data conversion, for example, analog, digital, and serial, while functioning as an intelligent conversion bridge between field fault testing platform or PXI computer and electrical system of heavy mechanized bridge electrical system. The fault diagnosis software is of hierarchical modular structure with integration of system management control, fault detection and circuit hardware driver modules together with fault repair and diagnosis database. Therefore it provides functions of human-machine interaction, equipment fault detection, fault diagnosis and analysis, as well as repair and maintenance guidance The fault testing and diagnosis system in this work is also featured with handy structure, lightweight, low consumption, large storage capacity, excellent expandability and intelligent inference capability. The system can be used in the online fault testing and diagnosis of similar engineering equipments. So it has important engineering and military application value to the rapid fault testing and fault diagnosis of engineering equipments.
Preparation and Antibacterial Activity of Silver Doping Nano Zinc Oxide
Authors: Li Qun , Zhao Xi Hui , Li Xiao Wen , Wang Li Ping , Liu Qian Qian , Zhang Chao
Published: July 2014

Zinc oxalate dihydrate as the precursor of anometer zinc oxide (nano-ZnO) was prepared by direct precipitation method. The zinc oxalate dihydrate was dispersed in a silver nitrate solution, and then the resulting solution was filtered and dried under 120°C. The silver doping nano-Zinc oxide (nano-SDZO) was obtained by decrepitating the zinc oxalate dihydrate cake under 500°C. The microstructure of nano-ZnO and nano-SDZO were characterized by TEM, and the chemical reaction in the heat burst process was described. The nano-ZnO particles were 50-60 nm in diameter, and the particle size of nano-SDZO in the range of 20-100 nm. Antibacterial activity of the nano-ZnO and nano-SDZO were compared. The results show that all of the ZnO samples inhibited the growth of S. aureus and E. coli, and nano-SDZO showed a relatively higher inhibition rate than other samples. Two possible mechanisms were proposed to explain the inhibition of bacteria.
The Establishment and Weight Calculation Method of Evaluation Indexes for the Float Board Propulsion System
Authors: Cai Yao Quan , Zeng Fan Ming , Liu Jin Lin
Published: July 2014

This article aims at solving the problem of evaluation indexes establishment in the process of complexity and the evaluation indexes weight calculation in the process of ambiguity and uncertainty for the float board propulsion system, study and establish evaluation system of the float board propulsion system, make an intensive analysis of calculation method for indexes weight based on rough analytic hierarchy process and calculate the weight of evaluation indexes for the float board propulsion system. This will provide scientific guidance for design and evaluation of the project and lays the certain theory foundation for quality of the design for the float board propulsion system.
The Simulation Studies of PWM Voltage Source Rectifier under Unbalanced Grid Voltage
Authors: Zhang Jun Li , Li Yu Ren
Published: July 2014

Under the balanced or unbalanced grid voltage, the PWM voltage source rectifiers should have many advantages such as sinusoidal input current, unity power factor, four-quadrant operation, the DC voltage stability, etc., so it can be employed in very broad application field. When there is only fundamental positive sequence current component in AC current, the voltage in DC side will remain constant, the rectifier will achieve efficient transformation of power quality. It is necessary to start from control strategies to eliminate harmful components such as the negative sequence current, to improve power quality in rectifier transformation. The mathematical model of PWM rectifier under unbalanced grid voltage was established in the synchronous rotating coordinate system in this paper. The simulation studies of rectifier under unbalanced grid voltage were conducted
VLC-LED Receiver Condenser with Optimized CPC
Authors: Wu Zhao Xia , Nie You Jin , Jin Wei , Zhang Zhi Xu , Qiao Qian , Gu Er Dan
Published: July 2014

In order to enhance the signal intensity of VLC-LED receiver, this paper describes a receiver condenser which is designed based on optimized CPC (compound parabolic concentrator) by using a truncated method, for achieving the aim of boosting receiver’s ability of gathering light and enhancing signal intensity. The Monte Carlo-ray tracing simulation results shows that in the VLC-LED system, the optimized CPC condenser has those advantages, such as higher concentration ratio, larger concentrate light deviation angle.
300 MW Coal Tangential Boiler Furnace Numerical Simulation
Authors: Liu Hong Xian , Li Bin Xia
Published: July 2014

By using the computational fluid dynamics software Fluent and the choice of the reasonable mathematical model, the flow, heat transfer and combustion are simulated in a 300 MW tangential firing boiler furnace. In the process of numerical simulation in the furnace, the gas phase turbulent flow usesRealizable model for both sides and solves the governing equations using SIMPLEC algorithm. Calculation results show that the highest temperature in the furnace is in the burner area,the whole furnace space rotates flow field, residual rotation still exists in the exit of the furnace, and the smoke temperature deviation causes in the residual rotation of furnace exit.
The Research of Drive Roll’s Dynamics Characteristics
Authors: Li Shao Hai
Published: July 2014

In order to research the dynamic characteristics of drive roll, finite element model of the drive roll was set up by ANSYS/Workbench. The drive roll’s natural frequency and vibration mode concerned in reality were acquired based on modal analysis, deformation trend and size of each mode shape were analysed, then deformation of the weak positions about each mode was cleared, and some measures about improving its dynamic characteristics were proposed, all of these offered a support to strengthen drive roll’s damping property.
Analysis and Research on the Picking Roller of the Half-Feed Peanut Combine Harvester
Authors: Lü Xiao Lian , Hu Zhi Chao , Peng Bao Liang
Published: July 2014

Picking peanuts is the key operational link and the core technology of peanut combine harvester. On the basis the theoretical analysis of picking mechanism and structural parameters of the half-feed picking roller, and combined with the picking performance experimental, the structural parameters of the picking blades and blades quantity of picking roller were studied. The results show that: when the straight-shaped blade is picking, the picking force is strong, the broken branch and seedling phenomenon is serious, peanut broken rate and peanut with handle rate are higher; the arc-shaped blade reduced peanut damage, and effectively reduced the rate of the peanut with handle. The picking blade radian has a large impact to the peanut broken and loss rate. When the blade radian is 70° and the blade radius is 35mm, total loss rate is the lowest on the picking segment of the blade. The blade quantity has significant influence to the peanut broken and loss rate. The peanut broken rate of the 8 blades is 2 to 3 times of the 4 and 6 blades; the picking net rate of the 4 blades is much lower than 6 and 8 blades. The self-design the picking roller is 6 arc-shaped blades, the blade radius is 35mm, and the blade radian is 70°. The study provides the design basis for the research and development of the half-feed peanut picking device.
A Variable Proportional Valve Braking Force Distribution Strategy Including SOC Constraints of Electric Vehicles
Authors: Yu Hong Xia , Lin Zhen Yang
Published: July 2014

Braking force distribution plays an important role in energy recovery of electric vehicles. A new braking force distribution based on the variable proportional valve is proposed to solve the traditional proportional valve braking force distribution problem. By considering the safety brake force distribution area, the variable proportional valve friction braking force distribution line is optimized, the regenerative braking force equations are deduced using the optimized friction braking force distribution line at different braking intensity, then the regenerative braking force is corrected by considering mechanical characteristics of motor and SOC of battery constraints. Simulation results show that the proposed regenerative braking energy recovery has been significantly improved.
Multi-Objective Optimization for the Section Structure of Sandwich Plate Applied in the High-Speed Train Compartments
Authors: Wang Yi Qing , Chen Xu , Wang Bin , Kuang Xin Bin , Tian Xiao Geng
Published: July 2014

In order to obtain the side walls section structures of high speed train applicable to different running speeds and conditions, a multi-objective optimization design is made based on the structure of topology optimization. In this optimization formulation, the weight of sandwich plate, static compliance and maximum deformation are used as the objective functions; the thickness of face panels and cores in five parts of the side wall are variables; and the air pressure gradient in compartments is the constraint function. Surrogate model techniques are adopted for constructing the response surfaces based on the optimization. Finally, a multi-objective optimization is performed using the NSGA-II algorithm and the optimization generates a Pareto solution set. The structure performance in Pareto set is greatly improved by 8.21% -33.58% than that of topology structure. In addition, the Pareto solution set provides engineers with many alternative Pareto-optimal solutions for optimization design of the sandwich plate section applied in the high-speed train.
Study on the Stress Variation Mechanism for the Rails under the Wheels Repeated Rolling Effects
Authors: Song Hua , Song Lin Bang , Yao Jin Kai , Lian Fa Bo , Li Wei
Published: July 2014

Abstract：Based on the real geometry and boundary conditions of the wheels and rails, the models of 60kg/m U75V heavy rail and the wear regions of LM are built using ANSYS/LS-DYNA software. The internal stress value and variation of the heavy rails that were repeatedly crushed by the rolling wheels are analyzed using the ANSYS/LS-DYNA3D software. The relationship of the internal stress and variation of heavy rails with the repeated rolling of the wheels are obtained. It provides an important theoretical proof and reference significance to prevent the different failure behaviors of the rails.
Information Systems for Composite Materials: Requirements and Challenges
Authors: Dangelmaier Wilhelm , Sommer-Dittrich Thomas , Streichhan Jenny , Monhof Markus
Published: July 2014

Using fiber-reinforced composites (FRC) in automotive lightweight construction currently is too expensive to achieve a wide distribution. To assist the engineers’ material selection process suitable information systems are needed. Development of those are a hard task due to the complex structure of FRC. In this paper we give an insight to the problem domain and introduce requirements which should be met by an information system for composite data storage.
Synthesis of Cu2ZnSnSe4 Compounds Using Solvo-Thermal Method
Authors: Chou Chuen Shii , Jhang Jhih Wei , Wu Ping , Lu Wei Hua
Published: July 2014

We reported a fabrication of Cu2ZnSnSe4 (CZTSe) via an elemental solvo-thermal method. To suppress the sublimation of Se, we made use of binary compounds of high vaporization temperature by first converting solid Se into a liquid-like alloy. Single-phase CZTSe compounds with the band gap of 1.32 eV were successfully synthesized and characterized. The effect of synthesizing temperature on the formation of CZTSe was also investigated.
The Microstructure and Mechanical Properties Research of FeCrWMoV-Series High Temperature Self-Compensation Lubricating Composite Materials
Authors: Han Ying , Wang Yan Jun , Wang Shou Ren , Xue Guang Ji
Published: July 2014

High temperature self-compensation lubricating composite materials were fabricated by vacuum sintering method in this work. The FeCrWMoV alloy powder was used as the basic material, the TiC and Co ceramic powder was used as reinforcing material and TiH2 and CaCO3 was used as pore-forming material. The changes of the crushing strength, micro-hardness and porosity were analyzed with the temperature. The pore structure and surface morphology of the preforms were analyzed using scanning electron microscope (SEM). The conclusion is that the most appropriate sintering temperature is 1250oC in the process of sintering, and the formation of secondary organization has significant influence on the properties of composite materials.
Continuously Large-Scale Preparation of Multi-Layer Graphene Grown on Polycrystalline SiC Microspheres
Authors: Ma Jun , Li Gong Yi , Chu Zeng Yong , Hu Tian Jiao , Li Yi He , Li Xiao Dong
Published: July 2014

Gram scale multi-layer graphene grown on polycrystalline SiC microspheres were prepared by continuously preparation method in argon through chemical vapor deposition process using liquid polysilacarbosilane as raw material. The observation of products obtained at different temperature confirmed the growth is temperature dependent process. The method could be developed to synthesis hybrid nanostructures based on multi-layer graphene grown on polycrystalline SiC microspheres.
Characteristics of Swirl Effervescent Atomizer Spray Angle
Authors: Ghaffar Zulkifli Abdul , Kasolang Salmiah , Hamid Ahmad Hussein Abdul
Published: July 2014

In the application of sprays produced by an atomizer, spray angle is one of key performance parameters. A larger spray angle is often required in providing a better spray dispersion. Swirl effervescent atomizer is one of the existing atomizers with the capability to produce a large spray angle. The formation of spray angle from this atomizer however is hardly understood. A newly-designed swirl effervescent atomizer was developed and tested with different swirl-generating vane angle in order to understand the swirl intensity effect on the spray angle. Experiments were carried out based on a cold flow test approach using water as the working fluid and nitrogen gas as the atomizing agent. High-speed shadowgraph technique was deployed to record the resultant sprays produced. Video recordings, acquired using a high-speed video camera, were converted to a sequence of images for further analysis using an image processing software. It was found that the spray angle increases with the swirl-generating vane angle. Specifically, the spray angle shows an abrupt increase for the case of swirl-generating vane angle changing from 30° to 45° but visualizes only a gradual increase in the case of swirl-generating vane angle changing from 45° to 60°.
A New Incremental Sheet Forming Process Based on Layer Manufacture
Authors: Liu Jie
Published: July 2014

Sheet dieless digital forming is a new sheet metal dieless forming technology. This paper introduced the fundamentals of the Sheet dieless digital forming process. Based on the principle of “layered manufacture” in rapid prototype technology, this process resolves the intricate three-dimensional geometry information of the workpiece into a series of two-dimensional data, which can be used by an NC system to control a forming tool to make a curvilinear movement over the raw sheet metal layer by layer until the component wanted is formed. This paper introduced the Sheet dieless digital forming system and metal digital forming technology.
Improving Rate of Penetration for PDC Drill Bit Using Reverse Engineering
Authors: Abdul-Rani A.M. , Ismail M.Zamri , Zaky M.Ariff , Noor M.Hariz M. , Zhun Y.Y. , Ganesan K. , Rao T.V.V.L.N. , Kamal Subhash , Ginta Turnad Lenggo
Published: July 2014

In petroleum industry, drilling is one of the most important aspects due to its economics. Reduction in drilling time is desired to minimize operations cost. This work focus on Polycrystalline Diamond Compact (PDC) drill bit which is categorized as a fixed cutter drilling bit. Problem such as wear and tear of PDC cutter are some of the main factors in drilling process failure affecting the rate of penetration (RoP). Thus, an intensive study in drill bit design could potentially save costs if the drill bit efficiency can be improved. The objective of this research is to improve the PDC cutter design and analyse design improvement in relation to the rate of penetration using reverse engineering (RE) approach. RE method is capable of resolving unavailable drill bit blueprint from the manufacturer due to propriety and confidential. RE non-contact data acquisition device, 3D laser scanner will be used to obtain cloud data of the existing worn drill bit. Computer Aided Design (CAD) software is used to convert cloud data of the PDC drill bit into 3D CAD model. Optimization of PDC Drill bit is focused on feature design such as back rake angle, side rake angle and number of cutters. CAE software is used to analyse the effect of the design feature modification to rate of penetration. Results show rate of penetration increases as the angle of both rake angle and number of cutter decreases.
Parameters and Path Optimization on Formidability of Incremental Sheet Forming
Authors: Chen Yun Chi , Li Fang , Wang Qiu Cheng
Published: July 2014

On the basis of ANSYS/LS-DYNA, the finite element model of incremented forming of conical part was constructed. The plastic deformation area of blank was increased and crack was delayed in multistage. Forming parts with the angle of 90°use multistage forming. Focused on the investigation of the influence of process parameters on the thinning rate and the thickness distribution then least-square response surface method was adopted to set up the approximate optimization model for thinning. The optimization on the approximate model was carried out using sequential quadratic programming method. The results show that the experimentally thinning rate is consistent with the theoretic result based on the homogeneous thickness distribution.
Mixing Homogeneity and Rheological Characterization for Optimal Binder Formulation for Metal Injection Moulding
Authors: Amin Azriszul Mohd , Ibrahim Mohd Halim Irwan , Asmawi Rosli
Published: July 2014

Mixing homogeneity and the feedstock rheological characteristic for optimal binder formulation in metal injection moulding is evaluated between Polypropylene (PP) and Sewage fat (SF) or Fat Oil Grease (FOG). Difference powder loading of SS316L also being used here to determine the possibility of the best binder formulation selected could be optimised for optimal powder loading base on rheological characteristic analysis. Two binder formulations of PP to SF being selected here are 60/40 and 70/30 accordingly with the powder loading of 60% and 55% for each binder formulation. The analysis will be base on viscosity, shear rate, temperature, activation energy, flow behaviour index and moldability index. It is found that rheological result shows all the two binder formulations with both powder loading exhibit pseudoplastic behaviour or shear thinning where the viscosity decrease with increasing shear rate. Feedstock viscosity also decrease with increasing temperature indication of suitability for moulding. Results from all the analysis conducted shows that the volumetric powder loading of 60% with binder volumetric of 60% for PP and 40% for SF contributes significant stability and suitability for optimum powder loading.
Modeling Platform for a Micro-CHP System with SOFC Operating under Load Changes
Authors: Kupecki Jakub
Published: July 2014

Paper presents a novel approach to modeling of a micro-combined heat and power (μ-CHP) unit with solid oxide fuel cells (SOFC). The proposed numerical simulator can be applied both to the analysis of a system operation in the design point and in off-design. Main components of the power system have been represented by dedicated sub-models, incorporated in the numerical simulator of a complete μ-CHP unit. The proposed modeling platform offers the possibility of analyzing system with different solid oxide fuel cells, its operation at partial loads and with various fuels. Components of the system can be modified, technical specifications can be adjusted in order to allow simulation of other components. The main equations for electrical and overall efficiency calculations are given and discussed.
Gases Effects for Synthesis ZnO Nanostructures Using Carbon Assisted
Authors: Polsongkram Dheerachai , Chamninok Pattanasuk , An Ki Seok , Pukird Supakorn
Published: July 2014

The morphologies of ZnO nanostructured were synthesized by carbon assisted. The materials source will be prepared by mixing Zn, ZnO and coconut shell charcoal or graphite. The materials source and silicon substrates were put in quartz tube of furnace, heated in difference gases. When, the temperature was cooled down to natural room temperature. The materials sources and silicon substrates will be studied by scanning electron microscope (SEM) and an energy dispersive X-rays instrument (EDX). The results showed that ZnO nanostructures materials such as nanotatrapods, nanowires, nanorods and nanoparticles can be observed.
Research on Coupled Thermo-Hydro-Mechanical Mechanism for Heavy Oil Thermal Recovery
Authors: Sun Feng , Yang Wen Dong
Published: July 2014

Thermal production is an important heavy oil recovery method , which bothers with the complex problems of Thermo-Hydro-Mechanical coupling effects and reservoir failure processes due to thermal recovery. Based on the coupling theory of T-H-M, the fully coupling equations of heat transfer, fluid seepage, geomechanics, and reservoir damage are constructed. The Galerkin FEM with fully implicit and sequential iterative algorithm is adopted to solve the coupling equations. Numerical results demonstrate that Thermo-hydro-mechanical coupling effect takes as important roles in thermal process. The response of the rocks surrounding the reservoir has a significant stress transfer, pore pressure increase or thermal cracking. This paper presents an analytical method to predictions coupled geomechanical effects and change of reservoir parameters, which are all important phenomena affecting heavy oil exploitation.
Mathematical Modelling to Evaluate the Superplastic Material Constants by Bulge Test
Authors: Gillo Giuliano
Published: July 2014

The mechanical behaviour of a superplastic material is often modelled by the power law relationship between the equivalent flow stress, the equivalent strain and the equivalent strain-rate at least over a limited range of strain rates. This paper introduces an original mathematical modelling to determine the superplastic material constants m, n and K by means of experimental tests carried out using a standard forming die geometry.
Study on Flow Characteristics of Valve Inlet Blockage
Authors: An Yan Tao , Ma Ru Jian , Zhao Dong
Published: July 2014

The flow characteristic and differential pressure-flow of inlet blockage fault and trouble-free for control valve are numerical simulated by CFD. The study shows that relative gain of flow characteristic curve for inlet blockage is increased, and it enhances the influence on fluctuation to flow change. The flow is less than the trouble-free at the same pressure, and with the increase of the differential pressure, flow difference of comparing with trouble-free increases gradually.
Flexible Laparoscopic Forceps Manipulator Using Synchronous Belt Mechanism
Authors: Chen Song Ping , Li Yong Xian , Li Gui Bin , Wang Jian Lin
Published: July 2014

In laparoscopic surgery, many problems are due to the poor degrees of freedom (DOF) of movement in controlling the forceps and laparoscopes. This paper proposes a new flexible laparoscopic forceps manipulator using synchronous belt drive mechanism, which consist of two miniaturized parts, synchronous belt drive mechanism enables independent bending procedure from-90° to 90° at the tip of forceps, and friction wheel mechanism which provides pivoting motion of forceps around incision hole on the abdomen. This mechanism is simple with high rigidity and can easily be miniaturized. The most remarkable characteristics of the prototype described in this paper are: 1) the casing diameter of the forceps is 5 mm; 2) with high rigidity and the repeatability positioning accuracy was 0.5o in bending motion; 3) pure mechanical structure with simple operation and low cost. This manipulator can solve the conflicts and blockings in laparoscopic surgery by switching back and forceps towards, meanwhile, it eliminates the surgical doctor’s fatigue and enhances the precision of surgery with higher effectiveness and safety as well.
Movement Mechanism Analysis of a Piezoelectric Spherical Two-Dimensional Stabilized Platform
Authors: Lv Qiong Ying , Tao Xi Jia , Mei Yu Shi , Sun Yu , Zhang Dan Dan
Published: July 2014

Based on the theory of spherical stability and piezoelectric motor drive with the combination of two dimensional stabilization platform. For two-dimensional motion spherical stabilized platform overall structure, having pitch and azimuth two ways. Using the theory of mechanics and geometry to mathematical modeling, prove multiple piezoelectric motor synergy drive, to achieve two-dimensional stabilized platform smooth movement. The design method and mathematical model analysis methods put forward by two-dimensional stabilized platform have important reference value to similar equipment research and development, important innovative progress has been made in structure, layout, and control methods.
Research about Dynamic Performance Prediction for Layout Structure of Globoidal Cam Machine
Authors: Yao Yi Yong , Zhao Li Ping , Diao Guang Zhou , Zhao Hu , Yan Pen
Published: July 2014

Aiming to the layout structure design and performance prediction for globoidal cam machine, a dynamic performance prediction method for machine layout structure is proposed in this paper. With the method, the motion transmission and layout structure are determined based on the mapping rules between function and structure. The prediction model for dynamic performance is established based on BP neural network, which is used to optimize the dynamic performance of layout structure for globoibal cam machine.
Corrosion Behavior of Electrodeposited CoNiFe Nanoparticles Immersed in Different Environments
Authors: Resali Nor Azrina , Hyie Koay Mei , Berhan M.N. , Nik Roselina N.R. , Mardziah Che Murad
Published: July 2014

Replacement or repair of corrosion damaged equipment is the largest maintenance requirement for the industry. One technique for reducing the corrosion of metals is to coat them with thin layers of less reactive metals or alloys. Unfortunately, most metallic coatings are inherently porous and historically have been of little value as barriers against corrosion. Recently, with the development of new alternative material such as electrodeposited CoNiFe, these problems have largely been overcome. This paper investigated the effects of different aggressive environments on the corrosion behavior of electrodeposited CoNiFe. Interestingly, the mixed morphologies with spherical and dendritic structure were found in the neutral and alkaline environment. This morphology exhibited the smallest particle size with less percentage of oxygen elements. Besides, alkaline environment experienced the slowest corrosion rate due to the mixed morphology. It was found that spherical and dendritic refinement provides higher corrosion resistance. The corrosion rate of the sample prepared in alkaline environment was the lowest compared to the others due to the reduction of particle size.
Analysis of Casing Hanger Fluid Channel Performance
Authors: Hou Chao , Zhang Kai , Wang Hong Yan , Tian Shu Bin , Xiao Wen Sheng , Liu Jian
Published: July 2014

In this paper, calculating the deformation and the static strength of the fluid channel during the process of casing hanger running, well cementation and oil production with ANSYS. Researching the effect of the fluid channel deformation on drain and decompression, and the effect of the fluid channel stress concentration position and its existence on casing hanger structure strength. On the basis of those research, ascertaining the optimum range of the fluid channel aperture.
Design of 80000N·m Torsion Testing Machine
Authors: Yu Wei Li
Published: July 2014

The article introduce the mechanical structure and the principles of 80000 N·m torsion testing machine, the structure and the principles of checking power unit of this kind of testing machines and the control manner and the principles of the electronic control system, than expound the benefits of the equipment and its application.
Study on Whole PID Control Method of 5 Degree of Freedom Bearing-Less Motor
Authors: Yang Jun Yue , Ge Yan Jun
Published: July 2014

According to the insufficient in the dispersion PID control method of 5 degree of freedom bearing-less motor suspension control system, based on the rigid body kinematics principle, this paper presents a whole PID control method for 5 degree of freedom levitation force, the mathematical modeling has been established, through the experiment, it is proved validity and practicability, The results of experiment show that, compared to the dispersion PID control method, the whole PID control method improves the interference immunity of bearing-less motor output effectively.
A Novel Solar Concentrating Dish for Reduced Manufacturing Cost
Authors: Cameron Michael , Ahmed Noor A.
Published: July 2014

This paper presents a novel solar dish configuration which can attain a high concentration factor and also facilitate substantial on board energy storage while being low in projected manufacturing cost. This is due to minimizing the requirement for extreme rigidity and accuracy in the design, in turn through reducing the cantilever distance from dish to receiver. This is done by using a novel split / recombined focus arrangement, enabling rim angles up to 900, thus bringing the focal point much closer to the dish than standard dishes, which typically use approximately 450. This research is potentially significant for dish Concentrating Solar Power (CSP) in general and other emerging CSP systems that require high concentration factors.
Inherent Characteristic Similarity Analysis on Short Thin-Walled Cylindrical Shell
Authors: Han Qing Bin , Guo Jian , Sun Ning , Luo Zhong
Published: July 2014

A method for predicting the vibration characteristics of the short thin-walled cylindrical shell was presented by dynamic similarity analysis. Firstly, the similarity conditions between the prototype system and its complete-similitude scale model were derived from their equations of motion. Then, the scaling factors, such as length, radius, thickness, force, and excitation frequency, spring constant and dynamic responses of the cylindrical shell were determined based on the last similarity conditions and the dimensional analysis theory. Free and forced vibration analyses of the elastically supported prototype cylindrical shell and those of its complete-similitude scale model were performed to validate the derived scaling laws, and satisfactory results were obtained.
Optimal Locomotive Control Parameters of Biologically Inspired Four-Legged Walking Machine
Authors: Park Sung Ho , Hong Dong Pyo
Published: July 2014

Mechanical models have been more on technical rather than on biological concepts, which yield unstable locomotion with low speed. Structural and locomotive characteristics of living creatures are copied and modeled with 13 links, 12 joints and body, from the mechanical engineering viewpoint. Quadruped models are simulated as a time variable for the one cycle. Torques at joints are calculated and finally converted to total consumed energy. Variables, specifying structure and locomotion, are applied to the simulation as a time function, and the optimal variables which minimize energy expenditure are derived which can be directly applied to the Quadruped locomotion.
Modal Analysis and Experimental Research of Marine Gearbox
Authors: Liu Wen , Lin Teng Jiao , Peng Quan Cheng
Published: July 2014

The gear-shaft-bearing-housing coupled finite element model of marine gearbox was established by using the truss element, the spring element and the tetrahedral element. The modal of gearbox was analyzed by using the ANSYS software. Then through the experimental modal analysis, the natural frequencies of gearbox are obtained. Compare the experimental results with the numerical results, it shows good agreement.
Mixing Analysis of Laminar Flow in Static Mixers with Circle Grid Fractal Perforated Plate Elements
Authors: Manshoor Bukhari , Zaman Izzuddin , Sapit Azwan , Khalid Amir
Published: July 2014

The static mixers are widely used in many industries to obtain the desired type of mixing. In the context of mixing process, two different fluids and have a different properties will mix in a single equipment to produce an another fluid with a new property. In this research, a new approach of static mixers was proposed for pipeline mixing. The flow pattern, pressure drop and mixing characteristics (coefficient of variation) were carried out by means of computer simulations. The static mixers introduced here consists of a series of perforated plate with circle grids fractal pattern elements. The simulations work were carried out by using a commercial package of Computational Fluid Dynamic (CFD), ANSYS CFX 14.0 software. Three levels of laminar flow with Reynolds numbers (Re) of 100, 200 and 400 respectively had been used to investigate the performance of the static mixers introduced here. The effectiveness of circle grid perforated plate static mixer had been evaluated by comparing the homogeneity level of mixing fluids for each flow simulated. The simulations gave a new insights in the flow pattern in circle grids fractal perforated plate elements. The pressure drop predictions compare favorably with literature data and the coefficient of variation (COV) value for circle grid perforated plate with 50% porosity at Reynolds number 100 was 0.0744 which is out of the range meanwhile at Reynolds number 200 and 400 was 0.0483 and 0.0247 respectively which are in the range of reasonable target for many applications. Mixing in the elements occurs through a combination of flow splitting and shearing at the junctions of successive elements. Besides that, simple installation and manufacturing of this type of static mixers makes the fractal perforated plate’s element an excellent static mixing device.
The Thermal Structure Coupling Analysis of Hydrostatic Motorized Spindle in Ultra-Precision Grinding Machine
Authors: Cui Yi , Li Hao Lin , Huang Hai Tao , Xin Xiao Wei
Published: July 2014

For the hard and brittle materials like optical glasses, ultra-precision grinding machine is primarily used, which can generate parts with high surface finish, high form accuracy and surface integrity. Motorized spindle is an inevitable choice of ultra-precision machine, but it has a prominent heat problem for its specific configuration of build-in motor. The paper does some research about motorized spindle thermal property. The heat resources and heat transferring ways are analyzed. The temperature distribution and deformation distribution of motorized spindle system are calculated through thermal structure coupling finite element analysis. The analysis results can provide warranty for motorized spindle design.
Dynamic Control of Braking-Force Distribution as Turning Braking
Authors: Xia Dong Sheng , Yu Yan , He Hui
Published: July 2014

The Braking-force distribution on the left and right wheels is a key factor influencing the braking performance of vehicles at a corner. To promote the braking stability and the control ability at the turning-braking process, a new method based on the steering-angle feedforward control principle was proposed to realize dynamic braking-force distribution on the left and right wheels. A vehicle model of three wheels with two freedom degrees was established. Computer simulation of the turning-braking process with dynamic distribution control was carried out. The simulated results show that the difference between the actual yaw rate and the ideal one is significantly reduced at the period of braking being effective. It is validated that the method can effectively improve the braking stability and the control ability of vehicles at the turning-braking process.
Research on Marine Electric Propulsion Shafting under Electromechanical Coupling Condition
Authors: Xiao Neng Qi , Zhou Ri Ping , Lin Xi Chen
Published: July 2014

Through the establishment of motor electromechanical coupling vibration model, torsional vibration characteristics of motor is analyzed in starting process. With 1000T lubricating oil ship electric propulsion shafting as the object of study, the free vibration and the forced vibration characteristics are analyzed. In two cases of considering the electromagnetic excitation torque and without considering the electromagnetic excitation torque, the responded vibration of electric propulsion shafting is calculated. The low noise design of the motor and propulsion shafting provides a theoretical basis.