bluuebunny/crossref_metadata_2025 huggingface dataset:
Intelligent Testing System for AC Load Based on PLC
Authors: Chu Yun Xia , Zou Yue Lin , Zhang Jun
Published: August 2014

The backup power plays an important emergency supply role in industrial field and agricultural field. The emergency supply power (such as generator and Uninterrupted Power System etc.) is a standby state in most of the time. These devices only start to ensure electricity supply on the condition of power lose or power failure. It is difficult for users to know its real load performance. This paper designed a kind of intelligent AC (Alternating current) load test system based on PLC (Programmable Logic Controller) to solve the problem. There are signal acquisition part, the dummy load component and parameter display control part in testing load testing system, which can meet the general users of emergency power supply in daily inspection. We design the intelligent control for high performance and fine test users. The test results show that the intelligent AC load systems based on PLC can effectively detect power generation units and UPS emergency power supply in according with national standards.
Prediction of Surface Roughness Based on Least Square Support Vector Machine in Low-Frequency Vibration Cutting Process
Authors: Du Wei Wen , Gu Li Zhi , Wang Jiao Tao
Published: August 2014

A prediction method based on least square support vector machine is introduced into the surface roughness prediction model in low-frequency vibration cutting. The model is created with low-frequency vibration cutting experiment for the corresponding relationship between vibration parameters and cutting parameters and the workpiece surface roughness. The training sample set is constructed to train regression models of least square support vector machine through experimental data. Identification of training sample set is done to gain the regression parametersaandb. The amplitude ofA, vibration frequencyf, feedf1and spindle speednare used as the input variable in Xi. Predicted values of surface roughness are forecasted with the model. Evaluation is made with the difference between the predicted value and experiment. Comparison with BP neural network and support vector machine method has shown that the least square support vector machine prediction model works faster than SVM method, the prediction error is about 29% of that by support vector machine, and the prediction accuracy is higher than the BP model.
Mechanical Properties Comparison of Different La Content in AZ91
Authors: Zhang Yan Yan , He Chun Xia , Yang Hang Song , Liu Jian Xiu
Published: August 2014

In order to improve the comprehensive mechanics performance of AZ91 magnesium alloy which is used as car's material, the La element was added in AZ91 magnesium alloy and specimens was prepared by powder metallurgy method. The influence of La on microstructure, hardness and compression performance of AZ91 a magnesium alloy specimen was studied using metallographic electronic microscope, hardness tester, universal tension and compression testing machine. The experimental results show that when amount of La's addition is 1.2%, its mechanical performance is best, hardness is 67.1 HV, compressive strength is 115.8 MPa, increased respectively by 20.0% and 29.5% compared the AZ91 magnesium alloy substrate, and the grain refinement effect of AZ91 magnesium alloy is the best at this time.
Safety and Reliability of High-Speed Milling Cutter's Evaluation and Control Methods
Authors: Jiang Bin , Sun Shou Zheng , Zhang Ming Hui , Cao Guang Lei , Sun Bin
Published: August 2014

The existing safety evaluation of high-speed milling cutter mainly based on ISO15641 standards, which by idling experiments, then analysis and determine centrifugal force conditions what cause permanent deformation and fracture destructive of cutter, this method cannot be forecast and control the dynamic evolution of the milling cutter's safety and reliability, when cutting load changed suddenly.This paper using the high speed milling cutter's failure criteria and safety margin model of cutting hardened steel, analysed and evaluated coupled thermal field distribution caused by hardened steel surface feature that changed frequently and cutter's impact, fatigue, strength, stiffness, safety margin which cuased by mutated shock load of cutter, then forecast safety and reliability of high-speed milling cutter, and proposed the control method of safety and reliability that could milled hardened steel in high speed.
Frequency Domain Error Analysis in Ultra-Precision Flycutting
Authors: Chen Guo Da , Liang Ying Chun , Wang He Ran , Sun Ya Zhou , Chen Jia Xuan
Published: August 2014

In some special fields such as precision optics, the part surface has strict requirements on the frequency domain errors, besides the conventional spatial domain errors such as surface roughness error. In light of the available works lacking of the frequency domain error analysis in ultra-precision flycutting, this paper therefore presents its frequency domain error analysis. A case study of KDP crystal flycutting is carried out to show its detailed processes, where the processing parameters, tool geometry, motion dynamic error of the machine guideway and tool-work vibration induced dynamic error are considered. A surface profile generation method is put forward. Two cases with different tool-work vibration frequencies are carried out. The spatial frequency spectrum is obtained based on the FFT analysis of the generated profile in the specified direction. After the in-depth analysis, the inherent correlation of the generated spatial frequency components with feed spatial frequency and machine dynamic errors induced spatial frequency under certain machining conditions are found, which is very meaningful for the frequency domain error prediction in the real application. The proposed analysis method can also be applied into other types of surface machining.
Development Status and Trends of Mass Finishing Processes
Authors: Li Wen Hui , Yang Sheng Qiang , Li Xiu Hong , Li Wei Dong
Published: August 2014

Mass finishing processes have widely industrial application, and in most conditions these processes are used with empiricism and trial and error. Based on basic concept of mass finishing, its category is presented. Main aspects of motion and force analysis, material removal model, equipment and consumables, process experiments and industrial application are induced. Finally, development trends are recommended from quantified models, process database, new mass finishing processes and surface integrity. This will provide full investigation and further development and research to improvement part surface integrity.
Research on Production Control Mode of Manufacturing System Based on Neuroendocrine Hormonal Regulation
Authors: Tang Dun Bing , Zhang Hai Tao , Dai Min , Wang Chang Sheng
Published: August 2014

With the developing control and configuration pattern of modern manufacturing system, the complexity of manufacturing system is enlarged and the operating environment is filled with uncertainty. Under the influence of many uncertain factors, reducing delivery time, due-date performance and low inventory become the important goals of production enterprise. This paper presents a bio-inspired manufacturing system control model, combining the knowledge of manufacturing system, biological control and control system. The relationship between response time and production rate of manufacturing system with different capacity is analyzed, production capacity controller is designed using PI and PD, and the control strategy differences of production rate deviation and overshoot is also discussed. Finally, an optimized design for the parameters of a two-layer work-in-process (WIP) inventory controller is analyzed, with the reference to the neuroendocrine regulatory mechanism. The simulation analysis shows that in bio-inspired manufacturing system made of organic manufacturing cells, the shorter the response time of production capacity is, the faster its production rate responses. With the combination of two-layer WIP inventory controller and traditional PID production capacity controller, the production system is more responsive and the production offset and overshoot are small when the unexpected external demand changes of manufacturing system occur.
Development and Experiment of Viscoelasticity Measurement Device for Sponge Material
Authors: Song Yi Lin , Zhang Tong , Gao Shu Mei , Wang Zhong Xian
Published: August 2014

The viscoelastic property of buffer material like sponge is an important index of material mechanics performance; it is also the main basis for choosing protective material used as hip protector. In order to research hip protector to prevent the elderly femoral fractures caused by falls, a single degree of freedom forced vibration model is adopted, and a portable viscoelasticity measurement device for sponge material is designed and developed in this paper. On this basis, the performance of the device is investigated, and the experimental research on the viscoelastic property of sponge material is carried out using the device. Investigation results show that the device has characteristics such as simple structure, light weight, and it can effectively realize the material property measurement of sponge material. At the same time, the experimental results to the viscoelasticitic property of sponge material show that the viscoelastic coefficients and usually given the performance index of sponge such as density, hardness have a close relationship. With the increase of sponge material hardness, the material's ability to resist deformation increases, so the viscoelastic coefficient also increases accordingly; but the viscoelasticity of material is also associated with the composition and the structure of the material. This research has obtained the effective method for measurement of the sponge material viscoelasticity, and found the change trend of viscoelasticity to density and hardness of sponge material, that is useful for us to select material of hip protector.
A Study of Multiple Laser Shock Micro-Adjustment Using Numerical Simulation
Authors: Zhang Di , Gu Chun Xing , Yuan Jun Wei , Shen Zong Bao , Liu Hui Xia , Wang Xiao
Published: August 2014

Laser shock micro-adjustment is a precise and noncontact adjustment technique using laser-shock-waves to adjust the curvature of micro-components. The experimental studies have indicated that: when laser shock region is located at the free end of cantilevers, multiple impacts are applied to achieve a large bending degree; meanwhile, different bending directions can be obtained with multiple impacts in the junction position. Efforts should been made to understand the mechanisms of multiple laser shock micro-adjustment. Two mechanisms have been proposed for describing the laser shock micro-adjustment in different laser shock regions, namely shock inertia mechanism and material flow mechanism. The proposed micro-adjustment mechanisms can predict bending angles and directions. To validate the proposed micro-adjustment mechanisms, numerical simulations were carried out based on the FEM method using the ANSYS/LS-DYNA software and the corresponding results demonstrate the proposed mechanisms.
Research on Modelling and Experiment for Passive Adaptive MR Damper Based on GMM Inverse Effect
Authors: Ding Pan , Liu Xiao Juan , Li Peng Fei , Jiao You Zhou , Zhang Quan Guo
Published: August 2014

Aiming at the limit of energy in quakeproof, aerospace and field ordnance, and requirements for damper’s different damping force in vehicle vibration’s pull and press stroke, a passive adaptive MR damper was designed and made. Passive adaptive MR damper is a new type of damper based on GMM inverse effect and MR effect, and it doesn’t need energy devices and can realize external force self-adaptation. A model of passive adaptive MR damper is established based on Jiles-Atherton model, the law of approach for the magneto mechanical effect, the magnetic circuit law and Bingham model. Experimental results show that the value of damping force is related to displacement and velocity: the larger the displacement, the greater the damping force; the faster the speed, the greater the damping force. This is consistent with the model. The damper has characteristic of load adaptive. Feasibility of the design was verified.
Analysis of Vibration Cause and Damping Design to Lubricating Oil Pipe of 10-K-302C Compressor Based on Numerical Simulation
Authors: Zhang Ya Xin , Pan Hai Li , Xu Xiao Zi
Published: August 2014

Vibration of pipe is the most frequently fault appeared in chemical engineering industry. In this paper, in order to resolve the problem of vibration in exceed of the set standard for the lubricating oil pipe of 10-K-302C compressor of DuShanzi petro-chemical company, the three-dimensional model of the pipe were established by using ANSYS Workbench, and the natural frequency and mode vibration of the pipe were obtained. Through ANSYS bidirectional coupled fluid-structure analyzing method, the variety of the pressure and velocity of the lubricating oil in the pipe, vibration frequency and the displacement of the pipe under working condition were carried out. By contrasting the analysis result between the numerical simulation and measured actually, the validity and accuracy of the numerical simulation have been affirmed and it has been found that the resonance and the large fluid pressure fluctuation were two main reasons caused the pipe vibration. Based on the conclusions above, two ways to reduce the vibration have put forward and the best way have determined.
Simulation Study of Material Deformation in Monocrystal Silicon Nano-Machining
Authors: Yu Nan , Liang Ying Chun , Chen Jia Xuan , Guo Yong Bo
Published: August 2014

Molecular dynamics simulations method is used on the study of material deformation in monocrystal silicon during nanomachining. Both nanoindentation and nanocutting by a diamond tool tip is investigated using LAMMPS. Characterization methods such as coordination number and labeling atoms in different layers have been adopted to study the law of transformation. As the surface atoms are tracked, their transformation law is analyzed and the formation mechanism of the cuttings and finished surface is announced. The impact crystal orientation of silicon on the machining is also studied.
Research on the Automatic Test System of Bus Dashboard Function Based on Machine Vision
Authors: Guo Rong Xing , Wang Jie , Ma Peng Ge
Published: August 2014

This paper studies the automatic test system of bus dashboard EOL (end of line) based on machine vision. Based on machine vision theory, Identification and detection algorithm of panel signal indicator elements and tachometer pointer readings was studied combining single-frame still images and real-time processing of color video image, the automatic parallel detection of multiple dashboard was realized by distributed network architecture. This paper first describes the function requirements, the overall composition and working principle of automatic test system. Then, it proposes an automatic identification and detection algorithm of dashboard symbol sheets and pointer position. Finally, it shows the designing of automatic test software with a self-learning and auto-detection function, and describes the working process of the software. The tests prove that the system is capable of realizing fast and accurate auto-test of bus dashboard functions based on the non-contact of machine vision, which improves the overall efficiency of the bus dashboard line.
Numerical Design of Stepped Compound Horn with Longitudinal-Torsional Vibration under Single Acoustic Excitation
Authors: Zheng Jian Xin , Han Jie , Liu Chuan Shao
Published: August 2014

The mechanism of longitudinal-torsional vibration (LTV) realized by using converter with multiple diagonal slits (MDS) was analyzed based on the acoustic wave propagation when acoustic wave enters obliquely from steel to air. The influences of geometrical parameters of the stepped compound horn with multiple diagonal slits on natural frequencies of LTV were studied with finite element analysis (FEA). The design procedure of stepped compound horn with LTV was provided. The vibration characteristics of actual horn were analyzed with simulation and test. The FEA results show that LTV of the output end of the stepped compound horn may be realized when the input end is excited by longitudinal vibration at certain natural frequency if suitable geometrical dimensions are selected, and the amplitude of the horn is periodical; the trajectory of the particle in the output end is helical curve. The test results indicate that LTV may be realized by stepped compound horn under single acoustic excitation, and the vibration frequency is close to the simulation result, and its vibration properties are good. This method may be applied to design the acoustics system of ultrasonic machining with LTV under single acoustic excitation.
Body Structure Static-Dynamic Analysis and Optimization of a Commercial Vehicle
Authors: Wang Ming Ming , Li Teng Fei , Li Xin , Liu Cheng , Liu Hui Xia
Published: August 2014

White body in the design process needs to meet the needs of a wide range of performance requirement. Adequate stiffness and modal are the basis to ensure the vehicle’s performance of vibration noise. Simultaneously, in order to reduce energy consumption and cost, the lightweight design of the white body has become the mainstream. In this paper, the optimization design is conducted for stiffness and modal of a commercial vehicle’s white body based on the theory of the finite element size sensitivity optimization design. Firstly, build the finite element model of a vehicle’s white body and analyze its stiffness and modal. Some changes were made to the car-body’s partial structure according to the distributing of strain energy achieved from above analysis, which improved the car-body’s dynamic and static performance initially. Secondly, choose panels needed to be optimized by reference to the density of strain energy and panels’ mass. Then, the car-body’s structure was optimized using panels’ thickness as design variables, stiffness and modal frequencies as constrains and minimizing weight of white car-body as objective. After the analysis of the result, modal separation was put forward to improve the quality of this finite element optimization design model. Finally, the car-body’s stiffness and mode nature entirely satisfied the requirements with car-body’s weight decreased.
Research on Tension Control System of Wire Saw Slicing Machine
Authors: Feng Yan Bo , Chen Bo , Sun Tao
Published: August 2014

Nowadays, wire sawing becomes the most advanced brittle crystals slicing technology because of its advantages of slicing larger crystals ingots into very small thickness, high surface quality, high yield wafers. In the process, the thin wire, which is the processing tools, travels at high speed, and subjects to external excitation from many aspects. Wire saw tension control is the core and difficulty of the control system. Mathematical models of tension subsystems were studied. The control strategy of swing arm motor tension direct closed-loop combination of speed difference indirect closed-loop was proposed. The developed tension control hardware and software system reached the functional requirements and technical indicators, and constant tension precision control was solved effectively.
Comparative Study on Pressure Field of Hydrostatic Thrust Bearing with Different Recess Shapes
Authors: Yu Xiao Dong , Wang Zhi Qiang , Meng Xiu Li , Zhou Qi Hui , Zhang Yan Qin , Yang Lan , Jiang Hui
Published: August 2014

A comparative study on pressure field of hydrostatic thrust bearing with sector recess, rectangular recess, ellipse recess and I-shaped recess is carried out in order to solve the deformation of the hydrostatic thrust bearing. The Finite Volume Method has been used to compute three-dimensional pressure field of gap oil film between the rotation worktable and the base. This study theoretically analyzes the influence of recess shape on the bearing pressure characteristic according to Computational Fluid Dynamics (CFD) and lubricating theory. It has revealed its pressure field distribution law. The simulation results indicate that an improved characteristic will be affected by recess shape easily. Through this method, the safety of a hydrostatic thrust bearing with different recesses can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, and experiment and deformation computation for hydrostatic thrust bearing.
Improvement and Error Analysis of Spring Tube Stiffness Measurement
Authors: Liu Wen Xuan , Wang Hui Feng , Wang Guang Lin , Shao Dong Xiang
Published: August 2014

This article analyzes the deviation of existing stiffness measurement method and comes to the main components of the measurement error. Focus on the influence of the bending deformation all of aspects and contact deformation between the various links to the measurement accuracy. Establish the relationship between the actual deformation and the measured deformation to the spring tube through homogeneous coordinate transformation and finite element analysis, in order to identify the error sources impact on the measurement greatest, and improve the measure methods to against the main error source, eliminate the influence of the main error source to the stiffness measurement, then achieve the purpose of improving the measure accuracy.
Research on Kinematics of Assistant Robot Based on Vector Product Method
Authors: Xing Jia Zhen , Wang Zhong Min , Qi Yu Ming , Deng San Peng
Published: August 2014

To the world population aging serious problem, a research on assistant robot is more and more attention. Assistant Robot is a device that is similar to human exoskeleton. This device is worn by the operator, and keep consistent with the human walking and replace body to undertake cargo load. In this paper, based on the method of vector product, a 3-DOF assistant robot’s motion is analyzed. Jacobi matrix of robot motion is calculated. According to the experimental data from human walking, the assistant robot’s displacement and velocity vector and variation are simulated, and its variation are also analyzed. In theory, it proved that the velocity and displacement curves are continuous and smooth. Besides, it also provides references for control system design of the assistant robot.
Research on Modeling and Coordinated Driving Control for Wheeled Mobile Robot on Complex Terrain
Authors: Ge Ping Shu , Zhang Rong Hui , Zhang Tao , Zhao Xiu Chun , Tao Liu
Published: August 2014

Lunar rover is a special kind of wheeled mobile robot for deep space exploration mission. On the moon, the soft weathered layers, as well as different sizes of rocks and craters, are distributed disorderly and unsystematically. Facing such kinds of complex environments and terrains, the mobility and terrain trafficability performance of the lunar rover will be threatened to a certain extent. The SpaceDyn toolbox is adopted to build the six-wheeled lunar rover kinematics relation and to calculate the kinetic parameters. Then the lunar rover dynamics model can be achieved. The wheel-soil interaction model on soft terrain is established based on terramechanics theory. Finally, the coordinated driving controller for the six-wheeled lunar rover on complex soft terrain is designed according to the above model. Numerical calculation and computer simulations are performed to verify the performance of the designed controller on soft terrain. Results indicate that the lunar rover has a better coordination driving control ability when using the designed controller, which may provide a reference for motion control of other kinds of wheeled mobile robot.
Stereoscopic Positioning of Intelligent Fruit Harvesting Robot: a Review
Authors: Ye Min , Zou Xiang Jun , Xiong Jun Tao , Wang Hong Jun , Chen Yan , Mo Yu Da , Lin Gui Chao
Published: August 2014

Target stereoscopic positioning is a significant sign of intelligent robot. The paper first described the research status of harvesting robot target stereoscopic positioning, discussed senor and stereoscopic positioning applications. Then, method and algorithm of rapid identification in target image were stated. In addition, version positioning, mechanism positioning, comprehensive positioning, associated positioning error, random positioning systematic error and application and existing problem of robot were introduced in this paper. Finally, harvesting robot positioning error compensation was proposed with the aiming at realizing robot precision positioning and expecting a great prospect of intelligent harvesting robot.
Design and Modeling of Three Joint Mechanical Arm Based on the Free Floating Space Robot Project
Authors: Zhang Xi , Wu Da Qi
Published: August 2014

The frequence and complex of space exploration activeities makes the life of the spacecraft and on-orbit service technologies becoming research hotspot in recent years. But the limitation of non-renewable fuels makes exploration mission costly and maintenance difficult, so the free floating space robot has its unique advantages. Because the research level and control technology is not maturity, study on the free floating space robot control method is the key theory and technology which is the difficulty that our country now needs to overcome, also, the research is of great theoretical and practical significance. This paper introduct an experiment scara mechanical arm based on the free floating space robot project. Main research contents of this paper include the mechanical structure design, and combining with the characteristic of the free floating mechanical arm , it makes kinematics and dynamics modals of the mechanical arm system, additional, it conduct statics test and dynamic modal analysis, which is to make sure that the mechanical arm could satisfy needs and to study its dynamic characteristics.This topic focus on structure design and mathematical modeling of the mechanical arm, it makes the research of control method and trajectory planning no longer stay on the paper, and makes the research more authenticity and accuracy.
Research of Drives of Power Amplifiers of Magnetic Levitation Servo Spindle Applied to Micro EDM Based on FPGA
Authors: Guo Yong Feng , Luo Song , Ling Ze Bin , Zhang Xiao You
Published: August 2014

The drives of power amplifiers of magnetic levitation servo spindle applied to micro EDM (Electron discharge machining) based on FPGA (Field programmable gate array) are developed. The drive module that produces the PWM (Pulse width modulation) waves that conform to the requirements of spindle power amplifiers involving three-level half bridge switch power amplifier, three-level full bridge switch power amplifier and motor power amplifier, according to input of action values from magnetic levitation servo spindle controller DSP (Digital signal processor) is designed. Multi-PWM producing algorithm by single timer with multi comparing nodes is proposed. After being applied to control system of magnetic levitation servo spindle, the drives accomplish conversion from DSP action values to PWM waves. The PWMs that drive radial coil current power amplifier have phase difference of 180°. The PWMs that drive axial coil current power amplifier have dead zone time and their wave shapes are complementary. The PWMs that drive the motor power amplifier conform to requirements of power amplifier chip LMD18200. Using FPGA to realize the drive function of spindle power amplifier makes the drive design more flexible, resource distribution of DSP more optimized, the task of algorithms running more centralized, and the drives module gets simpler and more reliable because the phase shift circuit and dead zone circuit are cancelled but the function of phase shift and dead zone is reserved.
Temperature Field Numerical Analysis of Machining Process Based on the Finite Element Analysis
Authors: Hu Yan Juan , Wang Yao , Wang Zhan Li
Published: August 2014

In order to study the temperature field distribution in the process of machining, the finite element theory was used to establish the orthogonal cutting finite element model, and the key technologies were discussed simultaneously. By using ABAQUS software for cutting AISI1045 steel temperature field of numerical simulation, the conclusion about changing rule of cutting temperature field can be gotten. The results show that this method can efficiently simulate the distribution of temperature field of the workpiece, cutter and scraps, which is effected by thermo-mechanical coupling in metal work process. It provides the theory evidence for the intensive study of metal-cutting principle, optimizing cutting parameters and improving processing technic and so on.
The Site Visualization and Closed-Loop Control for 3D Assembly Process
Authors: Zhang Peng , Bao Jin Song , Yang Zhi Bo , Huang Feng Chun
Published: August 2014

With the rapid development of 3D CAD technology, 3D assembly process is playing an important role in the on-site assembly. A closed-loop control method and three-dimensional site visualization technology site is presented. The methodology takes into account CAD design stage, assembly process design, site assembly and site inspection. The method includes three key technologies: the verification process technology of three-dimensional assembly process, optimization and process simulation techniques of site assembly, closed-loop control technology of assembly process quality inspection. Finally, the method and technology has applied in the actual assembly, and achieved good results.
Solid-Sealed Polar Pole CMM Digital Measurement and Error Evaluation
Authors: Pan Wei Min , Ye Xin , Kong Ning Ning
Published: August 2014

Solid-sealed polar pole embed Vacuum quenching pot and related conductive part in an easily solidified insulating material such as epoxy resin, making the whole Breaker as a uniform component, decreasing its overall dimension. CMM is widely used in many sectors. Using CMM is one of the most effective ways to carry out for dimension data comparing other measuring method. In the contact, a precise digital measurement is carried out for the key mounting dimension and space tolerance of form and position, then calculating and analyzing the measuring result, and then guarantee the mounting dimension, providing a basis for solid-sealed Vacuum quenching and guide sleeve research such as heat resistance, deformation, tolerance and Fits, etc, which improve the conformity and accuracy of solid-sealed Vacuum quenching.
Research on Vibration Characteristics of Hardened Steel Precision Machining Process
Authors: Chen Guang Jun , Wang Yu Shuo , Xu Rui , Liu Xian Li
Published: August 2014

Hard cutting technology is a green cutting technology of broad application prospect, but hard cutting is more likely to produce vibration compared with traditional cutting, and the production efficiency, machining quality, environment, cost and machine tools and tool life will be affected by the precision in the process of hard cutting chatter. Turning hardened steel GCr15 cylindrical bar using PCBN inserts on the lathe CAK6150DI analyzed the cutting vibration signal characteristic in the different state of cutting tool; analyzed the related features of dynamic cutting force and cutting vibration signals; and observed the microstructure on the machined surface. Analysis results show that the vibration of smooth cutting state is given mainly with forced vibration and noise, vibration signals are produced with the typical characteristics of high range frequency in frequency zone, disperse frequency domain energy; When the cutting chatter, strong self-excited vibration appeared and occupied the main position of vibration signal energy, frequency domain energy is concentrated in nearly natural frequency of the main vibration system of the lower cutting. The results of the study can provide theoretical guidance for the control of vibration in hardened cutting process.
Process Parameter Prediction of Differential Pressure Vacuum Casting Based on Support Vector Machine
Authors: Zhang Xu , Zhang Hai Guang , Zhang Zhuang Ya , Hu Qing Xi
Published: August 2014

To reduce warpage deformation of the differential pressure vacuum casting (DPVC) products and to improve product quality, One prediction method for process parameters based on support vector machine (SVM) and artificial fish-swarm algorithm (AFSA) is proposed.Firstly sample test data is abtained by using orthogonal experimental design and numerical simulation to construct models to forecast warpage of DPVC product based on SVM. Simultaneously to improve the predictive accuracy of the model, AFSA is introduced to optimize the SVM model. And then using this model recommends and adjusts the DPVC process in order to achieve quality control. Finally , through the analysis of a mouse shell , the validity of the method proposed is verified, providing a feasible method for DPVC product quality control
The Trend and Actuality of Hybrid Power Loaders
Authors: Wang Yao , Zhao Ding Xuan , Wang Zhan Li , Hu Yan Juan
Published: August 2014

Hybrid technology has already been recognized as the direction of energy conservation and reduction by world, thus it has drawn the universal concern of Engineering Machinery enterprise and the researchers. Loader as the representative of construction equipment for its high quautity and broad application over the market. In this paper, based on the categories of the hybrid power loader and combined with the latest research achievements at home and overseas,the research status of hybrid power loader has been summarized,while pointing out the problems in the development of hybrid power loader.Besides,the text also analyzes the development trend of hybrid power loader.
Effects of Cutting Speed on the Wear Properties of TiAlN PVD Coated Tool for Cutting P20 Mold Steel
Authors: Lin Hua , Lin You Xi , Han Zhen Wei
Published: August 2014

High-speed cutting is an important method for improving the efficiency and quality of machining mold steel, but the wear of tool is one of the key factors restricting the improvement of cutting speed, which brings higher requirement for the material of tools. At present, most of the research is about high-speed cutting for high hardness mold steel, while only a limited research work on the pre-hardened plastic mold steel with hardness between 30 HRC and 42HRC, such as P20 mold steel. To explore the effects of cutting speed on the wear properties of TiAlN PVD coated tool for cutting P20 mold steel, the experiments in different cutting speeds were carried out under dry condition. Wear characterization of the rake and the flank surfaces were investigated by using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). It was revealed that at the low speed (160m/min), adhesion (built-up edge) followed by delamination was found to be the cause of wear damage; at the high speed (320m/min), the dominant wear mechanisms were oxidation wear and diffusion wear, followed by adhesive wear and melt wear; as the cutting speed increased, the proportion of oxidation wear and diffusion wear was gradually increased.
Implementation of Data Communication of a Food Safety Testing Instrument
Authors: Wu Ang , Zhu Juan Hua , Wang Yong Tian , He Yu Jing
Published: August 2014

In order to make the food safety testing instrument more flexible and convenient and process a lot of data, combining the advantages of the VB interface design and MATLAB secondary development, the serial communication software is developed based food safety testing instrument. The test data is uploaded to computer through RS232 serial port. The research staff needs only to input the parameters simply, and all the parameters were automatically matching with the testing instrument, the test data reception, processing, preservation, search and delete functions was completed through VB calling MATLAB. The software has the abilities of friendly interface, easy to use, high stability, and can shield and correct the misuse of users. It has high value in engineering and can be widely used in similar embedded test instrument.
Vibration Characteristic of Violin Bowstring and Experimental Research on Helmholtz Motion of String
Authors: Ye Bang Yan , Liu Jian Ping , Zhang Cheng Zhong , Zhao X.Z. , Liang S.S. , Niu J.Y.
Published: August 2014

The sound source of violin is string vibration. By the stick–slip friction action between bow and string of violin, string and bridge form a complicated vibration system. The interaction mechanism of bowstring is very intricacy. In this paper, through theoretical analysis and experiment, the vibration behavior of violin string is investigated. We measured the vibration images of bowing and plucking violin string on a high-speed photography optical platform and got two different character of string vibration, including vibration displacement, velocity and space trajectory of the mark point on string. By comparing the displacement curves of the different points among on string, the variety of the ratio of positive process time to negative one of vibration sawtooth waveform are studied, and also the formation process of string vibration enveloping curve. On this basis, the Helmholtz motion of string vibration which is presented at 1862 is studied.
Researches on Resource Allocation of Virtual Enterprise Based on Multi-Agent
Authors: Wang Ni , Zhang Tian Rui , Cai Dong Dong , Li Kai
Published: August 2014

The resource allocation problems of virtual enterprise were analyzed by introducing the content of the virtual enterprise resource management and classifications. From the task decomposition of virtual enterprise, the enterprise business process reengineering (BRP) and enterprise resource planning (ERP) were introduced into the actual operation on resource allocation of virtual enterprise. The framework model, which was based on artificial intelligence body hierarchical Multi-Agent system, was put forward. Finally, through constructing the operation of the management system of virtual enterprise partners, it proved that the resource allocation model which was put forward in this paper could effectively meet customer needs and reduce the enterprise cost.
Static Stiffness Optimization of Large Ram Based on Equivalent Elastic Modulus
Authors: Wu Feng He , Xu Xiao Peng , Wang Jun , Fan Jun Wei
Published: August 2014

The finite element model of heavy-duty machine tool’s ram components has a large number of elements, many contact pairs for assembly and a large-scale optimization calculation, which make the optimization difficult to conduct. To solve this problem, a static stiffness optimization method of the large component based on the equivalent elastic modulus is put forward. The proposed method is applied to super-heavy-duty CNC floor-type milling and boring machine of TK6932 as a case study. Based on the principle of the equivalent stiffness, the ram assembly with complex constraints and contacts is equivalent to a ram part without other components, the calculation method of the equivalent elastic modulus is analyzed and the equivalent elastic modulus formula of the ram under the bending load is derived. Taking the four box-walls’ thickness and the three stiffened-plates’ thickness of the ram as the optimization variables, the minimal volume under static loading as the target and the maximal displacement and stress as the constraints, the optimized mathematical model of the ram’s equivalent static stiffness is established. The results of the optimization are rounded according to the sensitivity analysis. Besides, the optimization effect is proved by simulation through the finite element technology. The optimization procedure and results show that the simplified method based on equivalent elastic modulus presented in the paper can control the calculation scale effectively, and ensure the process of the optimization smooth.
A Study of Minimal Quantity Lubrication with MWCNTs in Turning of AISI 304L Steel
Authors: Huang Wei Tai , Tsai Hsun Heng , Wu Der Ho , Lee Wei Tai
Published: August 2014

This paper proposes a new lubricant environment when MWCNTs was used in MQL for AISI 304L in the turning machine. The effects of dry cutting, MQL cutting, and MWCNTs/MQL were compared to the surface roughness of work pieces, cutting temperature and the tool wear. In the past, the studies have shown that the MQL process can prolong tool life and improve surface accuracy in machining. The purpose of using MWCNTs suspensions is to increase the thermal conductivity of cutting fluid and to reduce the temperature during the cutting and decrease the thermal wear of tool simultaneously. The present study investigated the characterization of the MWCNTs was applied into MQL during the turning process of AISI 304L experimentally. The results showed that the MWCNTs will be a very good additive to MQL, not only with the benefits of improving surface roughness but also with ability of prolonging life of tool by reducing the cutting temperature in turning AISI 304L.
Dressing of Grinding Wheels for Ultra Precision Grinding of Diffractive Structures in Tungsten Carbide Molds
Authors: Bletek Thomas , Klocke Fritz , Hünten Martin , Dambon Olaf
Published: August 2014

The manufacturing of molds with diffractive structures requires new approaches in terms of grinding wheel geometry and preparation. To be able to manufacture small geometric features such as widths and depths in the micron range on the mold, ideally sharp edged grinding wheels should be used. This paper will present dressing procedures to create sharp edged grinding wheels by using metal alloy blocks. The results and achieved tip radii of the dressed resin bonded and metal bonded fine grained grinding wheels will be presented. Finally, grinding tests of a tungsten carbide mold with a diffractive structure are conducted and the results of the achieved form accuracy and surface roughness are presented.
Experiment Study of the Fast Tool Servo (FTS) by Laser Interferometer
Authors: Zhao Rong Li , Chen Xin , Li Ke Tian , Chen Xin Du , Liu Qiang
Published: August 2014

This paper introduced a kind of fast tool servo (FTS). Base on in the frame rack, flexible hinge, piezoelectric ceramic driver, tool base, diamond tools and so on. Laser interferometer is used for displacement measuring of the fast tool servo. The structure simulation was done to the FTS and the nature frequency was obtained. The output displacement of FTS was measured by Laser interferometer. Four kinds of different sin wave sign were given and the frequency of driving voltage ranged from 10Hz to 400 Hz. The relation of the displacement and the driving voltage frequency and the relation of displacement and the driving voltage had been established by experiment.
Fabrication of Comb Shape of Leading Edge Wing of Dragonfly
Authors: Umezu Shinjiro , Tanabe Naoyuki , Hashimoto Hiromu
Published: August 2014

Research on Micro air vehicle (MAV) has been carried out by many researchers to gather information in environmental monitoring, security and so on. When the earthquake, fire, smoke take place, it is difficult for human beings to investigate the detail because of dangerous condition. However, MAV has possibility to investigate the detail because MAV can fly freely around. Recently, dragonfly is highly focused by many researchers because dragonfly has high flight performances those are high efficiency flight, unintended acceleration, rapid turn and hovering. In general, these characteristics have root that wing is corrugation shape. We focus on microstructures on wing and its aerodynamic characteristics because there are many unique microstructures. We focused on micro spikes on dragonfly wing. Over three thousands of spikes exist on two sides of wing. The length and shape of spikes are 10 to 100 micron meters and oblique circular cone. It is important to clear the aerodynamic effect of the oblique circular cone. Artificial wing was fabricated by following processes. We fabricated micro spikes utilizing electro polishing. Fabricated micro spikes were set on plate utilizing micro spot bonding. We investigated the flow around the artificial wing and found that the flow around wing was controlled by micro spikes on wing. In this paper, we focused on comb shape of leading edge of wing. Comb shape is fabricated utilizing micro-EDM. We investigate flow characteristics of comb shape.
Influences of Closed Loop Control Componentson the Performance of Ultra-Precision Machines
Authors: Brecher Christian , Lindemann Dominik , Wenzel Christian
Published: August 2014

At Fraunhofer IPT a test bench has been setup to analyze closed loop control components and their interfaces with focus on their application in ultra-precision machining applications. This paper will present the results of the analysis of feedback and servo drive systems and will give a close inside on the influences of linear scales and analog and digital servo drives for applications in ultra-precision machining. The performed measurements include the analysis of the position accuracy and repeatability (step response test) as well as the determination of the dynamic frequency characteristics (stiffness / compliance) of an air bearing axis. With respect to the aforementioned measurements the tests have been performed under the variation of linear scales (vendor, pitch, signal, sampling frequency, etc.) and servo drives (vendor, switching or linear amplifiers, PWM frequency, control architecture, DC bus voltage, etc.). The paper will give a summary on the results of the analyzed topics, carefully chosen regarding their relevance to ultra-precision machining. Finally, a short outlook to future research work concerning the analysis of CNC controls will be given.
Numerical Study of a 3-Axis Stage for Application of Fast Tool Servo
Authors: Liu Yung Tien , Li Bo Jheng
Published: August 2014

In this paper, a 3-axis stage consisted of a XY stage and Z-axis feeding tool holder is proposed for the application of fast tool servo (FTS). The XY stage actuated by six piezoelectric (PZT) actuators is designed with symmetric flexural hinges featuring low interference motions, high stiffness, and fast response. Numerical design using the finite element method (FEM) was conducted to investigate the steady characteristics (displacement, stiffness, stress, and strain) and dynamic characteristic of resonance frequency. According to calculation results, the major characteristics obtained along XYZ axes are as follows: displacements induced are 10.06, 10.28, and 20.31 μm due to the applied voltage being 50 V; stiffness are 112.84, 110.31, and 223.34 kN/mm; the maximum stresses at the hinges are 9.78, 10.9, and 100.56 N/mm2, which are lower than the allowable stress of aluminum used; and the resonant frequencies are 1.0, 0.64, and 0.4 kHz, respectively. Experimental examinations regarding to the resonant frequencies were performed with a maximum deviation of 16% along the Z-axis compared to the simulation result. As a result of the investigation, it is expected that the 3-axis stage can be effectively applied to implement a FTS.
Preliminary Investigation on Design and Fabrication of a Metallic-Ellipsoidal Neutron Focusing Mirror
Authors: Guo Jiang , Yamagata Yutaka , Takeda Shin , Kato Junichi , Hino Masahiro , Furusaka Michihiro , MORITA Shinya
Published: August 2014

Neutron beam is a very useful probe for material characterization and non-destructive testing. There are a number of plans to construct neutron instrumens using focusing mirror to improve beam quality with higher intensity and smaller spot size. In this paper, an ellipsoidal mirror made by a metal substrate is proposed. As the metal substrate, electroless nickel is adopted because of its amorphous structure, machinability and relatively large critical angle of neutron reflection. The design of ellipsoidal neutron focusing mirror is made by considering the neutron reflectivity. A mirror is fabricated by ultrahigh precision cutting and 1st polishing process, and the form accuracy of 5 μm P-V with surface roughness of 0.7 nm Ra is obtained. Through this experimental fabrication, the feasibility of the proposed method is verified.