bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimal Design of an Ultrasonic Transducer in Rotary Ultrasonic Machining
Authors: Zeng Fan Chong , Zhang Xiang Hui
Published: June 2012

In this paper, an ultrasonic transducer is designed and optimized in order to reduce the error of resonance frequency and maximize the amplitude of the radiating tip. In order to get the basic dimensions of an ultrasonic transducer easily, resonance frequency equations are derived by using the traditional analytic method. Using ANSYS FEM software, we analyzed the vibration model of the transducer, including Modal Analysis and Harmonic Response Analysis. Studied how the length of two resonance rods affects the resonance frequency. By optimizing the dimensions of the ultrasonic transducer, the error of resonance frequency is reduced to 0.03%; the amplitude of the vibrating tip is up to 6.20μm. The optimal results show that the transducer designed in this paper has superior performance parameters and meets the requirements of machining.
Performance Simulation for Electric Vehicle with Motorized Wheels with Cruise
Authors: Jin Li Qiang , Chen Peng Fei , Liu Yu Long
Published: June 2012

Abstract：Dynamic Modeling of the electric vehicle with motorized wheels (EVMW) is different from the conventional one. Cruise is more and more widely used in the field of vehicle performance omputing. Its calculation results are so precise, it is convenient to use and easy to achieve the integration of control strategies and vehicle simulation. In this paper, a simulation model of EVMW is built by cruise. It is used to verify the matching parameters of EVMW, and calculate the vehicle power and energy consumption rate. The results show that the powertrain parameters meet the vehicle driving range requirements
Quantitative Evaluation in Maintainability of Equipment Engineering Developing Stage
Authors: Tao Feng He , Liu Zhe , Mou Peng Bo
Published: June 2012

Analysis of the content in the stage of equipment engineering development equipment design and maintenance of design, putting forward the method of the quantitative evaluation of equipment maintainability. The instance studies have shown that this method is feasible.
Research of Machine Tool Reconfiguration Based on Reliability
Authors: Song Shi Gang , Hu Xia Xia , Liu Jian , Ma Jian
Published: June 2012

To adapt to agile workshop environment, the reliability of reconfiguration machine tool was analyzed, and the mathematical models of reconfiguration machine tools’ reliability guideline was established. By modular design of reconfiguration machine tool, the general idea of machine tool reconfiguration oriented to reliability was presented. The machine tool reconfiguration method based on modularization was researched mostly in such aspects as relativity analysis, module reconfiguration of lacking ability parameter, module reconfiguration of redundancy ability parameter. The method solved the rapidity reconfiguration ability of machine tool in system reconfiguration, utilized availability resource reasonably.
Research of Reliability Enhancement Testing about Fatigue Component of a Feeding Mechanism
Authors: Jin Zhao , Qin Jun Qi , Di Chang Chun
Published: June 2012

Life test of feeding mechanism cost too much time and capital. To solve these problems, applying Reliability Enhancement Testing (RET) to the feeding mechanism was advanced. Established and checked a virtual prototype model based on ADAMS, and the chain’s contact load spectrum was obtained under both common and enhanced conditions. The stress results are gotten after its finite element analysis in ANSYS. According to the load spectrums and stress result, the life of the chain joint and enhancement coefficient are gained under calculation in ANSYS/FE_SAFE. It can provide a good reference to fatigue based RET.
Research on Fatigue Life Forecast for Torsion Shaft of Self-Propelled Gun under Stochastic Loads
Authors: Hu Hui Bin , Cao Li Jun , Cao Xin Wen , Chen Shu Xiao , Jin Jian Zhong
Published: June 2012

Torsion shaft is the important buffer and damping component of Self-Propelled Gun. Its main failure mode is fatigue fracture. In order to forecast the fatigue life of torsion shaft under stochastic loads, virtual prototyping of Self-Propelled Gun is established in Pro/E and ADAMS. A new kind of measurement method of load spectrums combining actual equipment experiment with virtual prototyping is firstly put forward in this paper and provides complete and accurate load spectrums of torsion shaft. Stress and strain spectrums can be obtained based on material’s S-N curve. The fatigue life of torsion shaft can be forecasted, which provide adequate reference for the maintenance cycle confirmation and mission reliability forecast.
An Evolution Study on Family Characteristic of BMW 3 Series Based on Aerodynamics
Authors: Zhu Yun Feng
Published: June 2012

This paper made a study on automobile modeling design by taking two factors, aerodynamics and family characteristic, from many considerations, with an example of BMW 3 series. It analyzed the significant roles of these two factors’ influence on automobile modeling, and studied regular pattern of its evolution by taking a successful experience in automobile family characteristic in modeling. This paper is expected to provide assistance and instructions for automobile industry in China.
Solving Acoustic Radiation and Scattering Based on Coiflet
Authors: Xuan Jian Ping , Yu Ru Jie
Published: June 2012

In this paper, the acoustic Helmholtz boundary integral equation is solved using Coiflet scaling functions with interpolation approximation property. The scaling functions are utilized as base and test functions in Galerkin method and the expanded coefficients are the values of the function in sampling points, so the number of numerical integral is reduced. Two numerical examples are given and the calculation results agree well with the theoretical results, which show the high accuracy of the estimation and demonstrate validity and applicability of the method.
Steady CFD Analysis on Gas Turbine Stage Cascade Based on Mixing Plane Model
Authors: Su Gao , Zhou Guo Yi , Du Fei
Published: June 2012

Based on a standard dual-equation turbulent flow model and coupled explicit solver,a wall function method was employed to closure the Reynolds averaged N-S equation .The mixing plane method was adopted to tranfer parameters between rotor and stator cascades. A approximate linear law is obtained in gas turbine cascade for supercharged marine boiler,which governs the variation of some parameters at the outlet of the turbine stage cascade along the blade height direction,such as pressure,velocity,as well as temperature and Ma.The results can provide guidelines for aerodynamic optimization design of the gas turbine stage cascade and the scientific management of this kind of set.
Strategy and Application of Modeling and NC Machining for Rotary Parts of Complex Curved Surface
Authors: Liu Wei Hong , Liu Hai Bo
Published: June 2012

Aimed at the difficulty of rotary parts of complex curved surface in modeling and NC machining, making full use of advanced modern molding technology of Solidworks and powerful NC machining skill of Mastercam, the paper introduced a strategy , segmented milling that a true part was step to step machined by end mill not ball mill on 3 Axes NC milling machine but 4 Axes during rough machining. According to the method, it can raise the operation rate and shorten production cycle.
Stress and Deformation Mechanics Model of Sensing Structure in Micro-Machined Capacitive SOI Accelerometer
Authors: Dai Qiang , Zhang Yue , Xu Bin , Jiang Gang , Song Dan Lu , Cai Yong
Published: June 2012

Due to the micro-machined processes, there is residual stress in device layer of capacitive SOI accelerometer, which results in the deformation in sensing structure and hence, makes the device fail to work. To cope with the problem, based on the stress and stress gradient in device layer, in light of the mechanics theory and by dividing the proof -mass into several continuous varied cross-section beams, utilizing symmetric continuous conditions and deformation compatibility, a stress and deformation mechanics model of sensing structure in SOI accelerometer is proposed. By the comparison between the model and experiment data, which is obtained SOI device layer 50 μm and oxide layer 5 μm and model, it is indicated that the model could basically describe the sensing structure deformation. The model could hopefully be helpful in further exploration on stress and deformation in MEMS structure.
Study on 3D Strain Distribution Characteristics Using Etched Grid Method in Tube Bending
Authors: Li Heng , Yang He , Shi Kai Peng
Published: June 2012

Strain distribution is crucial for understanding tube bending and preventing defects. In this paper, taking 321 stainless steel as the objective, via etched grid method, the strain distribution characteristics during tube bending are studied, the effects of the bending velocity and the bending angle on the strain distribution are analyzed, and the consistency of thickness strain with wall thickness variation is verified. The results show that: (1) three-dimensional (3D) strain is symmetrically distributed about bending plane and reaches the maximum value at wall extrados and intrados; (2) absolute value of the 3D strain increases at first, then decreases in tube bending; (3) compared with bending angle, bending velocity has greater effect on spatial strain, and compared with tangent strain, thickness strain is more sensitive to bending velocity; (4) thickness strain distribution characteristics are generally consistent with distribution characteristics of wall thinning degree.
Study on Designs of Stoppers for MEMS Devices in Shock Environment
Authors: Jiang Tao , Zhou Jian , Feng Fei
Published: June 2012

Stoppers are commonly used to improve the shock resistance of MEMS devices. However, the collision between MEMS structure and stoppers in shock environment may lead to emergence of the stress wave, resulting in the failure of devices. Therefore, MEMS devices designed based on current statics theory is unreliable. After analyzing the method and principle for MEMS reliability design, the shock dynamics model was established. Based on the model, the response of the traditional design and designs with different stoppers to shock was researched. At last, protection performances of different stoppers were evaluated. Results showed that the use of stoppers could improve the shock resistance of the device obviously, but hard stoppers would cause to the emergence of the sharp stress wave. Elastic stoppers had excellent protection ability which could strengthen the shock resistance of the device greatly.
The Experimental Study on Dense Paste’s Rheological Characteristic
Authors: Gao Jie , Wang Liang , Yang Hua Xu , Zhang Shuang Yu , Wu Miao
Published: June 2012

This paper improves the existing pressure pipe rheological and resistance characteristic test system and optimizes the pressure and flow data acquisition method. Taking coal slime as an example, it conducts an experimental study on dense paste's rheological characteristics. It ensures the coal slime's rheological model transported in different pipe diameter of which the volume concentration is 57.06%～45.44%and analyses the rheological characteristic trend changing with diameter and volume concentration. The experiment proves that the new system is practicable and easy-operated and reliable. Also the original experimental data and processed result are in accordance with theoretical regulation.
An Improved Damage Detection Method and its Application
Authors: Ma Li Yuan , Wang Tian Hui , Li Yong Jun , Xie Shi Fu
Published: June 2012

A new method called Grey Relation Modal Flexibility Curvature Difference (GRMFCD)is proposed and applied to the numerical experiment and experimental research of a substructure. The results show the ability of GMFCD to locate the inflicted damage and qualitatively evaluate its severity for single and multiple scenarios, with only a few lower order modal parameters. The effectiveness and advantages of GMFCD as compared to the flexibility indicators, such as the change in flexibility, the curvature of the flexibility difference, are demonstrated.
The Modeling and Simulation for the Combined Mooring Windlass Test Rig
Authors: Zhu Yu , Cai Zhen Xiong , Liu Yong Chao
Published: June 2012

In order to inspect the working condition of the tension adjustment system of the marine hydraulic combined mooring windlass, the cable tension simulation device was established which is composed of the double-acting cylinder with electro hydraulic control. The simulation models of the cable tension simulation device and the cable tension adjustment system were set up in AMESim software. The simulation results of both models are verified by the experiments. The response of the tension adjustment system to the cable tension variation caused by the sea-wave is observed. The adjustment delay and maximum cable tension are obtained. The research in this paper provides the method to check the performance of the mooring windlass in the lab and provides the base for further optimization study on the dynamic response characteristic of the mooring windlass.
The Multi-Objective Optimization of the Planet Carrier in Wind Turbine Gearbox
Authors: Yi Peng Xing , Dong Li Jian , Chen Yuan Xin
Published: June 2012

In order to improve the reliability of a planet carrier, a simulation method based on multi-objective design optimization was developed in this paper. The objective of the method was to reduce the stress concentration, the deformation, and the quality of the planet carrier by optimizing the structure dimension. A parametric finite element model, which enables a good understanding of how the parameters affect the reliability of planet carrier, was established and simulated by ANSYS-WORKBENCH. The efficiency of the design optimization was improved by using a polynomials response surface to approximate the results of finite element analysis and a screening algorithm to determine the direction of optimization. Furthermore, the multi-objective optimization was capable of finding the global minimum results in the use of the minimum principle on the response surface. Computer simulation was carried out to verify the validity of the presented optimization method, by which the quality and the stability of the planet carrier were significantly reduced and improved, respectively. The methodology described in this paper can be effectively used to improve the reliability of planet carrier.
The Research of Cold Roll Forming Numerical Simulation of Involutes Spline on ANSYS
Authors: Zhou Chun Ying
Published: June 2012

According to the large deformation elastic-plastic FEM and contact theory, Through the cold roll forming numerical simulation of involutes spline by the finite element software ANSYS, studied with the key techniques of numerical simulation of the large displacements, large rotations, large elastic-plastic deformation under the highly complex nonlinear and the action of friction.
The Study of the Design Parameter of Lead Rubber Bearing
Authors: Wang Jie , Liu Jian Xin
Published: June 2012

The Lead-Rubber-Bearing is a type of isolation device in entirety. Its design parameter is complicated. when it is used in bridges, it always need plenty of time to design. It is not beneficial to its application and dissemination. The design formula now available are lack of relevance，can not provide a clear and distinct computation measure. This paper explains in a systematic way the formula and reasonable value range of the design parameter. These parameters include the diameter and height of lead pin, effective design deflection, the equivalent linear model, shear strain of rubber bearing shear stress of the lead，initial rigidity and second rigidity and so on. At last this paper induces computing method of equivalent rigidity and equivalent damping constant and gives some examples。This paper gives scientific basis for the concrete design and makes the bearing standard and serial to lay a foundation for its application.
Three D Spiral Surface Modeling by Simulation Based on the Section Profile Revolution – Accumulation Method
Authors: Gu Li Zhi , Cheng Bin
Published: June 2012

General expression of spiral is derived by turning any section profile into the end section profile, in terms of surface parameter equations based on the modeling principle in machining operations, and the body of spiral surface is divided into two parts, rotation part and spiral part, indicating the key point that the relative portion between the two parts is most important. “Revolution -Accumulation Method” is put forward with triangular patches being connected into a tiny slide. And the slides are rotated to some degrees and then superimposed together along the axis of the spiral, so as to construct final spiral surface. Two examples of modeling with Revolution- Accumulation Method, cylindrical spiral model and conic spiral model, the most widely used in engineering, are given and successfully executed.
Vertical Planetary Wheel Sand Reclamation Equipment Design and Modeling Based on Solid Edge
Authors: Li Shan , Wang Yu Qi , Xu Liang
Published: June 2012

Vertical planetary mill is a kind of efficient grinding equipment. Due to its unique design, the materials can suffer combined effects of squeezing, shearing and grinding.[1] This paper study the feasibility of the usage of the vertical planetary mill in the field of foundry sand reclamation. It will use Solid Edge to Design and modeling, and it can provide reference price for staff.
Vibration Characteristics of a Containing Liquid Cylindrical Pipe with Lumped Mass
Authors: Li Bing , Wei Yu Lan , Yan Qi Bo , Wang Yue Zhan
Published: June 2012

The liquid within a cylindrical pipe affects the vibration characteristics of the pipe. Furthermore, these vibration characteristics are affected by lumped mass on the pipe. The natural frequencies and the vibration modes of the cylindrical pipe with different lumped masses can be obtained by finite element analysis. The natural frequencies of the containing liquid cylindrical pipe are obtained by experiments. The experimental results show that the natural frequencies of the containing liquid pipe are affected by the lumped mass. The greater the lumped mass is, the smaller the natural frequencies of the pipe are.
A Study for Performance of Corn Straw Smashing Device
Authors: Zhang Li Juan , Geng Ling Xin , Shi Qing Xiang
Published: June 2012

Reducing smashing power is important to a combine harvester. The results from the experiments indicated that rationally choosing the combination of parameters of moving reamer，fixed reamer and bundle angles could remarkably reduces smashing power. The straight moving knife matching cutting fixed knife has a better feeding ability and can get a higher smashing ratio and consume lower power.
Research on Dynamic Characteristics Based on Roll-Bite Model in Metal Elastic-Plastic Deformation Process
Authors: Wang Qiao Yi , Gao Rui Jin , Zhu Yao , Zhao Yong
Published: June 2012

The main issue in cold rolling is the control of rolling chatter, the deformation of the metal sheet roll-bite is ideally homogeneous and elastic-plastic. In addition, only the vertical interactions of the work roll and the roll-bite are considered. The sheet force resulted from the elastic-plastic deformation of the roll-bite is established to be the dominant factor affecting the dynamic response of the work roll. Although the developed rolling system is highly nonlinear, however, the induced instability and chatter in response to various types of sheet force excitations are either modal excitation or resonance-like beating, both of which are characteristically linear. This article establishes the fundamental knowledge base required for the understanding of the characteristics and mechanism of the third and the fifth octave rolling chatters, and thus provides the essential basis for effective control of rolling instability and chatter-free roll mill design.
Applied Research on Optimum Design of Planetary Reducer
Authors: Zhang You Jun , Zhang Chen Chang , Han Li , Wang Jie
Published: June 2012

Reliability optimum design of the mechanical system is studied thoroughly based on the existing research results. Taking the 2K-H planetary reducer of PCP system as the physical mode, the main target of optimization is module, breadth of tooth and number of teeth. The objective function for obtaining a smaller gearbox volume is set up and the requirement of reliability is taken into account. The optimum solution is obtained by the complex method. The result is in conformity with the requirement and it indicates that the synthesis effect is satisfied. The reduction of volume is beneficial to improve PCP system performance.
Simulation Design of Clamp Holder for Sugarcane
Authors: Lin Mao , Fu Xin , Liang Dong
Published: June 2012

In order to increase the accuracy of the experienments of sugarcane’s physical cutting indoor. Due to the practicality of the ingathering by machines in field, the group did some simulation design of clamp holder for sugarcane’s structure on the experienment table. As to make sure the cases in laboratory are close to those in the fields, inflict suitable force to the sugarcane. The parameters of the two kinds of soil including the water content and the hardness value of soil are different. The dry one is 8.7% and 17.5kg/cm2. The wet one is 19.05% and 6.83kg/cm2. The structure of clamp for sugarcane is the form of two springs. 65Mn as material, the diameter is 3 mm, the free length is 130 mm, the active length is 127 mm, the stiffness coefficient is 44.3N/mm.
Study on the Mechanical Property of Gunpowder Composite Welding Rod
Authors: Jiang Jin Yong , Jia Xiao Biao , Lu Gui E , Jiang Lu Ming , Chang Wen Ping , Jia Hao Nan
Published: June 2012

Gunpowder composite welding rod is a new type of welding material, which is mainly composed with gunpowder and thermite. This welding rod has the following characteristics: (1) portable welding rod; (2) simple and safe in operation; (3) high controllability of combustion; (4) don’t need outside energy source, et al. obviously, all characteristics indicate that this welding material can satisfy the demand of field emergency or civil device emergency. In this article, the mainly components and characteristics of gunpowder composite welding rod are introduced in detail.
The Data Processing Technique of Metallic Sheet Friction Coefficient Determination
Authors: Xue Huan , Li Rong Feng , Zhu Hong Chuan
Published: June 2012

The definition and research background of friction is introduced. The reason of generation of friction is analyzed, the importance of the coefficient of friction test in sheet metal forming field is indicated. The testing principle of coefficient of friction on metallic sheet is presented. The basic data processing method of the test is described. Two important data processing techniques which will obviously effects the test results, including effective friction zone and normal pressure have been carefully studied. The comparison result shows these techniques can effectively enhance the testing stability and precision.
The Forced Creep Analysis of Nonmetallic Material
Authors: Zeng Shan Qi , Zhang Zhi Jie
Published: June 2012

Nonmetallic material by stress which less the yield stresses long time, it would force creep. Nonmetallic materials’ operating life depended on the creep degree. The paper set up creep model using ANSYS, create the nonmetallic material creep strain-time curve, got the creep properties of nonmetallic material. To provide effective basis of calculate the nonmetal materials’ operating life.
The Influence of the Coarse Aggregate Size on Mechanical Properties of Reinforced Concrete Beams
Authors: Sun Hong Quan , Ding Jun
Published: June 2012

This paper gives the influence of the coarse aggregate size on the mechanical properties of the beam with different coarse aggregate sizes under static loads. In the research, three reinforced concrete beams with three different coarse aggregate sizes separately are tested. The stains and the deflections of the beams under the static loads are measured. The results show that under the action of the same loads, the maximum strains of the reinforced concrete beams with the big and the small aggregate size separately are larger than that of the beam with mixed aggregate size, and the deflection of the beam with the big aggregate size is larger than that of the beam with small aggregate size. In the loading process, the changes of the normal section strain of the reinforced concrete beams are satisfied the assumption of the plane section.
Bearing Fault Detection Based on SVD and EMD
Authors: Chen Yan Long , Zhang Pei Lin
Published: June 2012

While bearing fault signals are strongly interferenced by noise, diagnosis using EMD directly for bearings fault becomes incorrect. A scheme based on Singular Value Decomposition(SVD) and Empirical Mode Decomposition(EMD) is proposed for solving this problem. Aiming at bearing fault signal characteristics, SVD preprocesses sampled signals to denoise. Then preprocessed signals are analyzed by EMD. Fault characteristic frequency can be obtained by spectrum analysis for Intrinsic Mode Functions(IMFs). This method is useful to detect fault of bearings and a comparison is made between it and EMD. The results show that this scheme can diagnose fault correctly under strong noise.
A Novel Design of Lower Limb Rehabilitation Robot Based on Spring Device and Magnesium Alloy
Authors: Li Jian , Zhang Xiu Feng , Pan Guo Xin , Li Hui
Published: June 2012

A novel design of lower limb rehabilitation robot was developed for lower limb dysfunction, such as stroke, paraplegia, traumatic brain injury and so on. Through analysis of clinical applicability, the design makes some improvements from material, structure, operation means and control system. In this paper, the spring device and magnesium alloy exoskeletons were introduced carefully, which can adapt changes of human gravity centre as walking and lighten the weight of wear. All of above are important for the clinical applicability of the robot.
Analysis of Tubing Collapse Failure during the Operation of Blending Light Dropping Viscosity
Authors: Wang Jian Jun , Feng Yao Rong , Luan Zhi Yong , Wang Gang
Published: June 2012

The heavy oil is the key point which China develops, at present the heavy oil is produced using the technique of blending light dropping viscosity, in addition to usual tubing failure ( pull out, fracture, perforation, corrosion etc.), a new failure form appeared that is tubing collapse, especially in western oilfields China. For the tubing collapse failure in heavy oil recovery well, this paper used the method which the experiment and the theory unify to launch on the analysis research, and mainly considered and analyzed tubing collapse strength under two kind of operating condition according to the field operation situation. This paper pointed out that should consider the bending effect in the pipe string design and the field operation, and must carry on the preliminary calculation to the anti-extrusion pressure in front of the field operation, in order to control the biggest anti-extrusion pressure in the annulus.
Complex Object Modeling Method Based on 3ds MAX Platform
Authors: Yu Ji Hong , Bai Xiao Ming , Lv Jun Wei
Published: June 2012

Ship modeling is more complicated than any other artificial architecture according to its complicated structure, anomalous formation, all types of surface. Based on analysis on the hull, we studied the skills and methods with three views and lofting technique on the platform of 3ds MAX. Firstly, collect detail parameters and views from Internet, then preprocess orthographic views before establishing reference hull and fragmented curves by lofting technique. At last a complete ship model by combing hull and weapons is established. The simulation result is lifelike; it can provide an attractive experiment environment for Virtual Reality, Object Recognition, Engineering Analysis, etc.
Research of Virtual Test of the Combine Harvester and its Key Components
Authors: Yang Zi Dong , Wang Xu Dong , Su Xia Kan
Published: June 2012

According to the purpose and requirements of a virtual test, the complex mechanism of the combine harvester was abstracted and simplified to some extent during modeling, but in order to guarantee the closeness between simulation result and the reality, attention was paid to keeping the total mass of all components close to the actual mass of the combine harvester and reducing workload during modeling. The vibration test of the cleaning operation includes horizontal vibration and vertical vibration. The test conditions are that: the combine harvester is still and has no load and only the engine runs, or the engine and the cleaning component run simultaneously. To guarantee the extractions are thrown out of the machine in the rear end of the screen, the backward slip of the extractions is greater than forward slip. The simulation result satisfactorily reflects the real situation and is same as theoretical analysis. The result indicates the virtual test and the real test are consistent.
Study on Constitutive Model of Weibull Distribution of Cement-Soil Uniaxial Stress Conditions
Authors: Yu Zhi Nang , Song Xin Jiang
Published: June 2012

According to the results of cement-soil uniaxial compressive test, consider cement-soil stress-strain relations as a continuous random process, the function of random variable obeys Weibull distribution, and introduce generalized hooke′s law in order to establish Weibull distribution of cement-soil constitutive model, solve the softening problem that a variety of incremental nonlinear elastic models cannot reflect the cement-soil. This paper discussed the parameter character of Weibull distribution model of cement-soil, presented the solving method of parameters of cement-soil Weibull distribution constitutive model, verified by results of test, revealed the rationality of the model and shows that the proposed model is more convenient than other model, have widely application value.
Effect of Precursor on the Hydrothermal Synthesis of K0.5Bi0.5TiO3 Crystals
Authors: Xu Guo Hui , Yang Lin Lin , Zu Yang Hui , Li Wei Guo , Wang Yu Jiang , Wang Yong Gang
Published: June 2012

K0.5Bi0.5TiO3 nanoparticles and quadrate nanoflakes were successfully prepared by a hydrothermal process. The as-synthesized powders were examined by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results suggest that the precursor plays an important role on the formation of K0.5Bi0.5TiO3 crystals and the formation mechanism was also discussed.
Au-Catalyzed Homocoupling of Terminal Alkynes
Authors: Xu Shao Hong
Published: June 2012

The homocoupling reaction of alkynes was carried out smoothly in the presence of 10 mol% AuCl3 using I2 as oxidant to generate diyned products in high yields. The method is simple, efficient, safe and AuClPh3 also showed comparable catalytic activity to this transformation.
Chip-Bifurcating Criteria for Bifurcating Chip Cutting Method of Metal Fibers
Authors: Li Yao Chao , Wan Zhen Ping , Liu Bin
Published: June 2012

Along with the wide applications of metal fibers in many fields, more and more attentions were paid on the preparation of metal fibers. Bifurcating chip cutting (BCC) is an effective method of manufacturing slim long metal fibers with high efficiency. In this paper, the chip-bifurcating states were studied in the process of BCC. The states can be classified into four kinds of circumstances according to the experimental results: thorough chip-bifurcating, incomplete chip-bifurcating, part chip-bifurcating and chip-bifurcating entirely but sticking together. Moreover, three chip-bifurcating criteria were proposed to keep the thorough chip-bifurcating state stable. The three chip-bifurcating criteria are found in good agreement with experimental results and can be used as a practical guide for producing slim long metal fibers by BCC.
Comprehensive Evaluation Research on the Performances of High Quality Underwear Fabrics
Authors: Liu Yan Jun , Xue Tao , Yang Li
Published: June 2012

Abstract. The performances of underwear fabrics are good or bad is a concept of Physiology and psychology, comprehensive evaluation of its performances by fuzzy mathematics is objective and accurate. Fuzzy mathematics was used in this paper to establish comprehensive evaluation model, and on the basis of this model, the comprehensive evaluation on the performances of the four warmth underwear fabrics were made. The evaluation result indicated that the comprehensive performances of wool fiber covering bamboo fiber compound fabric are superior to pure wool fiber fabric and wool/ bamboo fiber blended fabric. These kinds fabrics are suitable for making high quality warmth underwear for autumn and winter.
Controlled Growth of Carbon Spheres by Chemical Vapor Deposition Based on Anodic Aluminum Oxide Nano-Template
Authors: Chen Lei Shan , Wang Cun Jing , Chen Gai Rong
Published: June 2012

The reactions were carried out by decomposing acetylene at 1000 °C in a two-stage furnace system for 10 min. In the first furnace no catalyst was placed and an AAO template with the average diameter about 50 nm was placed in the second furnace whose temperature was designed to be 500 °C, 600 °C and 700 °C. The samples were characterized by scanning electron microscopy and high resolution transmission electron microscopy. The results show that carbon spheres with average diameter about 50 nm on the AAO template surface were obtained when the temperature of the second furnace was designed to be 700 °C. These carbon spheres are composed of unclosed graphene layers with an interlayer distance of 0.33–0.35 nm between the layers.
Corrosion Behavior of Prepainted Steel Sheets for Construction
Authors: Tu Yuan Qiang , Bai Hui Ping , Cai Jie , Huang Xian Qiu , Huang Chun Yan
Published: June 2012

The behavior on artificial weathering of the S320GD+Z prepainted steel sheet for construction was studied by neutral salt spray test, accelerated UV aging test. Their corrosion performance after accelerated UV aging test was investigated by electrochemical impedance spectroscope technique and atomic force microscopy. The results showed that the resistance to neutral salt spray and the resistance to accelerated UV radiation of the tested samples can meet the demands of domestic and overseas standards. After 2000 h accelerated UV radiation test, the corrosion resistance of prepainted steel sheet declined with the increase of roughness and decrease of electrochemical impedance of the coating surface.
Crystallization Behavior of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization
Authors: Li Min , Xiao Li Guang , Zhao Hong Kai
Published: June 2012

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The crystallization behavior of PE/MMT nanocomposites at different MMT concentrations (from 0.1 to 1.2 wt %) were investigated by differential scanning calorimetry (DSC). The equilibrium melting points increase by the addition of MMT. The crystallization rates of PE/MMT nanocomposites are faster than those of pure PE. The addition of MMT facilitated the crystallization of PE, with the MMT functioning as a heterogeneous nucleating agent at lower content; at higher concentrations, however, the physical hindrance of the MMT layers to the motion of PE chains retarded the crystallization process.
Effect of Annealing Temperature on Corrosion Resistance of Cold-Rolled Strip of Complex Brass
Authors: Liu Yang , Shang Wen Jing , Liu Hong Fang , Huang Zhi Gang
Published: June 2012

Using weight-loss method combined with metallographic to analysis the effect of annealing temperature (600°C, 640°C, 680°C) on the corrosion resistance of cold rolled strip of complex brass HAl72-2.5Al-1.0Ni alloy. Corrosive solutions for testing the corrosion velocity were 3.5% of the neutral sodium chloride solution, artificial acid rain (3.5% NaCl+H2SO4 solution) and artificial sweat solution. The research results show that the corrosion of cold rolled strip occurs easily because grains stretched along the direction of deformation and the existence of residual stress. The maximum corrosion depth of cold-rolled strip is 94.8μm. Annealing treatment can effectively reduce the corrosion depth of alloy. Corrosion resistance of alloy rises with the increase of annealing temperature, because the recrystallization degree of alloy goes on more sufficient. The corrosion depth of samples annealed at 600°C and 680°C drops from 64.45μm to 56.32μm respectively. Aluminum content in the alloy also affects the corrosion resistance of the alloy, because oxygen oxidizes aluminum to density Al2O3 film which prevents the further corrosion of the alloy. The corrosion velocity of samples in the solution of artificial acid rain is fastest and lowest in artificial perspiration solution.
Remote Control Testing Consumer Products for Durability and Performance
Authors: Cuta Andrei Nicolae , Trufasu Aurelian Ovidius
Published: June 2012

This paper presents an algorithm and implementation of remote control testing products over web interface. The testing device is programmed to work in a both automatic and manual mode. Automatic mode testing sequences are programmed by the user from a browser by entering time of the test, several variables (angle, focus, etc.) and the system repeats the process for programmed time. Manual mode offers user testing procedure at a desired time and steps. Our approach combines efficient common user interface with an algorithm to realize programmed tests.
Infrared Detection for Surveillance System
Authors: Rizescu Ciprian Ion , Vlad Bogdan Robert , Rizescu Dana
Published: June 2012

The paper deals with a surveillance system dedicated to close spaces which could be used in several situations: museums, banks, public institutions, airports. The authors continued a previous research [1] with applications in robotics. We developed a system based on detection with eight IR sensors and tracking with a video camera. This system has very good performances and a low price.
Ultrasound Examination – Mean of Analysis of the Layers Properties Deposited Through Different Thermal Spraying Methods
Authors: Constantin Dand Botez Sorin , Dumitru Gabriel Marius , Dumitru Bogdan , Viorel-Cristian Dina
Published: June 2012

Reconditioning materials by thermal spray metalizing is a rapidly growing field. In this paper we conducted a comparative study of three methods of metal deposition: flame spraying, atmospheric plasma spraying, arc spraying. This was done considering two of the properties of layers obtained in metalizing process: surface adhesion strength and porosity. The result of ultrasound examination by immersion shows that adhesion obtained through APS method is better than the others two obtained through AS and FS methods.
Analytical Calculation of the Position Loop Gain for Linear Motor CNC Machine Tool
Authors: Pandilov Zoran , Dukovski Vladimir
Published: June 2012

One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is position loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally position loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the position loop gain Kv. A combined digital-analog model of the 4-th order of the position loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary position loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency  and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. :The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable
Torsor Evaluation of the Tooth during the Milling Process
Authors: Bisu Claudiu , Olteanu Elena Luminița , Minciu Constantin , Zapciu Miron
Published: June 2012

Analysis of the torsor evolution in milling process is very important for optimization of the cutting process to achieve high quality of manufacturing, productivity and cost. Our study is based on the analysis of the Mx, My and Mz moments‘ evolution at the tooth tip of the tool during the milling process. A complex experiemntal setup is designed and realized to obtain a three-dimensional response of the mechanical actions. During the tests, the complete torsor of mechanical actions generated by the cutting process were measured by six components dynamometer (forces and moments according to each direction). In this paper a method for tool position determination in milling process is presented, with purpose to transport and evaluate the moments to the tooth tip of the milling cutter.
The Preliminary Study of Machinability during Milling of Titanium Alloy (Ti-6Al-4V)
Authors: Serboi Claudia , Velicu Stefan , Darnis Philippe , Laheurte Raynald , Ionescu Cristian
Published: June 2012

Titanium and its alloys have found wide application in the aerospace, biomedical and automotive industries owing to their good strength-to weight ratio and high corrosion resistance. However, these alloys have very poor machinability, which is attributed to their inherent high strength maintained at elevated temperature and low thermal conductivity leading to high cutting temperatures. This paper presents the findings of an experimental investigation into the effects of cutting speed, feed rate and depth of cut when milling titanium alloy Ti-6Al-4V. The cutting forces were the response variables investigated. This experimental investigation is translated into a mathematical model of cutting forces designed on the basis of the results obtained from this research.
Device Used for Magnetic Treatment of Fuel Fluids before Burner
Authors: Ciobanu Robert , Repetto Maurizio , Dontu Octavian , Freschi Fabio , Prisecaru Tudor
Published: June 2012

Worldwide magnetism was considered a "stepchild" of electromagnetism, but lately this has changed, and scientists give it great importance today, making a series of studies in which it is the main "actor". Regarding the magnetostatic field, the appearance of magnets with high performance, has led the development of permanent magnet structures with different technical applications, which successfully replace electromagnets. In this paper our main objective was to design and test a device used for magnetic treatment of fuel fluid which flow through pipes before burner to improve combustion dynamics and decrease the released fumes.
Mathematical Simulation of Leg's a 5-Dof a Biped Robot
Authors: Csaba Zoltan Mate , Erzsebet Faluvegi , Luciana Cristea
Published: June 2012

This paper aims to present special issues concerning the analysis of mobile robots with kinematic motion effects on the stability study. In the analysis, the authors used inverse kinematics, which enables rapid modelling and identifying solutions as regards the stability of bipedal robots. The symbolic solution for kinematics equations of biped robots is of great importance for the efficient controllability of these robots. In recent years, numerous researches have been done based on simulation of legged mechanism, especially on biped robots simulation and control. The following article focuses on the biped robot simulation and control handle with the aid of mathematical modeling methods (in MATLAB)
A Pneumatically Driven Stewart Platform Used as Fault Detection Device
Authors: Ramsauer Martin , Kastner Michael , Ferrara Paolo , Naderer Ronald , Gattringer Hubert
Published: June 2012

This paper investigates the sensorless detection and evaluation of inner oscillations of unknown test objects mounted on a compliant test bench. The principle of the sensorless analysis is that test objects are not totally rigid in reality. This means one or more parts of the test objects are oscillating with different eigenfrequencies compared to their rigid equivalent. By comparing eigenfrequencies of both (rigid and fault test object) oscillating parts are detectable. The aim of this experiment is to demonstrate the use of a 6 DOF compliant Stewart platform (alternatively used in a simulation environment) to generate frequency sweeps in all degrees of freedom, to get a sensorless detection of vibrations in unknown objects. For this purpose only the preexisting sensors applied for the control of the hexapod should be used. The detection of loose parts by shaking objects can be done by a complex robotic manipulation task. Being designed for flexible use by small and medium-sized enterprises, the robotic Stewart platform (hexapod) will adapt autonomously to different test objects leading to a highly flexible robot.
Functional and Constructive Optimization of a Serial-Modular Industrial Robot Implemented within a Single Purpose Flexible Manufacturing Cell
Authors: Petrişor Silviu Mihai , Bârsan Ghiţă
Published: June 2012

The authors of this paper aim to highlight the basic design of a flexible manufacturing cell destined for the final processing of water radiators used for AAVs, cell serviced by a serial modular industrial robot possessing in its kinematic chain structure three degrees of freedom, RRT SIL type. The paper outlines the concept, calculation and design of the (MRB) rotation module at the studied industrial robot’s base and of the (MT) translation module of the prehension device attached to the robotic arm. Depending on the organological elements that are part of the MRB rotation module and based on a rigorous dynamic study performed on robotic modules, modeling conducted with the help of Lagrangian equations of the second kind, a dynamic-organological calculation algorithm was obtained for the selection of the appropriate driving servomotor necessary to putting the rotation movable system into service. The last part of the paper deals with the flexible manufacturing cell, together with the calculations related to profitability, economy and investment return duration, following the implementation of the RRT SIL-type industrial robot.
Establishing the State of Operation on Vibration Behavior of the Industrial Robot
Authors: Niculescu Dan , Vagaš Marek , Olaru Adrian , Hajduk Mikuláš , Ghionea Adrian
Published: June 2012

Diagnosis measurement of vibration and noise, should allow monitoring of equipment defects, through a system of preventive maintenance, predictive. Automatic diagnosis of machinery and equipment was made in order to ensure a higher reliability of these and how to obtain a more extended life cycle without the occurrence of defects. Vibrations are always measured in analog format (time domain) and must be transformed into the frequency domain. Therefore Fast Fourier Transform (FFT) method is used to evaluate vibration Almega AX-V6 robot. The application of preventive and predictive maintenance management supports enterprise, because it proves effective, the information you provide in making decisions.