bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Remote Meter Reading System Based on PLC Technology
Authors: Zhang Yi Jiang
Published: November 2012

With the deepened transformation of China's power system, the stability and reliability of power utilization have been dramatically improved, but meter reading data acquisition does not keep pace with the times. With the continuous maturity of low-voltage power line communication (PLC), this leads us to see hopes of using PLC technology to realize remote meter reading. In this paper, based on current PLC technology and combining domestic and foreign successful cases, a beneficial exploration and research is conducted from the composition and establishment of software and the design of software and protocol.
Fuzzy Self-Tuning PID Controller in SEHS
Authors: Sun Lan
Published: November 2012

Because of the existing hybrid fuzzy PID controller does not perform, using electric hydraulic servo system application (SEHS). Therefore, when the system parameters change will require a new adjustment of PID controller variable. Therefore, a hybrid fuzzy and fuzzy self-tuning PID control was put forward. With this control scheme was divided into two parts, and the fuzzy controller and fuzzy self-tuning PID controller. Fuzzy controller is used to control the output of the system of the values of the system away from target value. We proved that the performance of the control scheme through the experiment of the motor speed control SEHS. The experimental results show that the proposed a hybrid fuzzy PID controller and fuzzy self-tuning effect is better than that of a hybrid fuzzy and PID controller.
Research of Universities Teaching Materials and Resources Based on Semantic Grid Portal Construction
Authors: Hu Chang Long , Liu Wei , Zhang Ji Dong
Published: November 2012

This paper discusses the college teaching resources based on semantic grid portal construction, which starts from the system architecture and explained how to construct a grid portal application that can support learning service in the area of semantic retrieving of teaching resources on the basis of description of the teaching resources based on semantic, and use the grid technology in SOA to improve the structure of teaching grid portal system.
Research of Optimal Control Model with Multiple Inputs and Multiple Outputs Based on Logic Algebra
Authors: Ling Yi Chun
Published: November 2012

Through the study of computer control system, article puts forward a mathematical model in the computer control system which controlled object is digital, and describes the mathematical model through logic algebra to form a set of method solving optimal index control laws which has the characters of easy to understand and easy to operate.
Eyelid Noise Detection Based on Gray-Scale Morphology and Judgement of Noise Occlusion
Authors: Li Su , Qian Li , Wang Yu Qian
Published: November 2012

In iris recognition, eyelid occlusions will reduce the accuracy of iris recognition, an algorithm of eyelid occlusions detection based on Gray-scale Morphology and the judgement of the noise occlusion is proposed in this paper. By judging the projection relation between eyelid and eyelashes, the algorithm in this paper could determine which part need to be detected, instead of detecting all of the eyelid and eyelashes occlusion blindly. So the efficiency of the algorithm is largely improved and in addition, the noise detection method based on gray-scale morphology could perfect fit out the eyelid edge.
Application of Multivariable Non-Linear Decoupling Control Based on Neural Network
Authors: Zhang Jian Bo , Fan Dong Hai , Hu Ren Zhi
Published: November 2012

Aimed at Neural Network can approach any nonlinear system with arbitrary accuracy, the frame of distributed NN decoupling system are proposed to decouple the MIMO nonlinear system. In this paper, we designed and finished the Distributed Control System based on ABB’s Freelance 800F, and collected experimental data to model the thermostatic heater, then we have carried out the mathematical model by means of MATLAB dynamic simulation. In sequence, we trained the neural network controller in MATLAB. When the decoupling is completed, we used controller to control the MIMO nonlinear system in DCS. Experiment result shows that it is conscientiously feasible and deserves to be widely applied in the process of controlling industry.
MHD: A New Method towards Privacy Protecting Datasets Published
Authors: Liu Fei , Jia Yan , Han Wei Hong
Published: November 2012

In this paper, we proposed a multi-hierarchical diversity algorithm MHD to prevent privacy disclosing in dataset. We proposed some definitions of multi-hierarchical diversity firstly. Sensitive values are partitioned into several classes. We ensured no proportion of class exceeding the threshold. We generalized some values of sensitive attribute to reduce information loss. Clustering method was used to lower data distort. Greed algorithm was used to lower time cost. We compared MHD with classic algorithms, ε-cloning and m-Invariance about Time Cost, Data Distort, Usability and Imbalance. Empirical results showed that our algorithm could protect privacy and publish datasets with high security and lower information loss
A Study on Component Composition Technology Based on XCM
Authors: Liu Yuan Yong
Published: November 2012

Component description and component composition are one of key technology of CBSD and software reuse. At present the different components depend on different component description model, which determines how to construct a single component and specific interaction and component assembly standards, and to generate interactive problems limiting component composition. The paper presents a model of component composition based on XCM, which to define components from the component selection and instantiate and to describe the connections from the component interface and to provide a mechanism of component composition from the components of the event and based on the deployment of the container. The XCM component composition model not only provides a unified description mechanism, also effectively solves the interaction problems.
Based on OLAP Realize Real-Time Integrated Analysis of the Underground Metal Mines Cost Information
Authors: Guo Jun , Gan De Qing , Tan Jing , Yao Xu Long
Published: November 2012

Through OLAP technology study and solve the data issues during the real-time integrated of cost information process. Using OLAP technology does classified and sequenced analyses on mines production cost multi-dimensionally and multi-angle computationally. It is carried the deep study that the application of OLAP theory and technology in underground metal mines cost analysis field, and meanwhile the relative OLAP modeling is put forward.
Precise Mechanics Control and Simulation of Automotive ABS
Authors: Wang Ya Kun , Tan Peng
Published: November 2012

The rapid development of computer technology has brought a huge boost to the automotive industry. This paper uses computer technology to carry out simulation studies of automotive anti-lock braking system (ABS), through braking characteristics of the dynamic equations, we establish the simulation model, and get ABS braking distance and time in different roads, and through optimizing the system design simulation, we provide parameters in accordance with the precise control of the anti-lock braking system.
Explosion-Proof Soft Starter Control System Based on DSP
Authors: Niu Xin , Wang Ya Qiong
Published: November 2012

According to requirements for the use of explosion-proof and intrinsically safe AC motor soft start device in coal mine, the paper designed and realized explosion-proof soft starting control device based on the TMS320LF2406A as soft starter control core.TMS320LF2406A is TI company's new DSP products, superior to the MCU extensive used in general micro-control unit.It has advantages of low cost, low power consumption and high performance processing ability.
Numerical Control Machines Performance Test Platform
Authors: Song Juan , Li Ming
Published: November 2012

Research on the dynamic performance testing test platform of numerical control equipment high-grade guarantee numerical control machine running reliable quality and machining, effectively predict the occurrence of equipment failure and effective, and save a lot of the cost of maintenance, improve the level of management of equipment. It has a very important significance are safe and reliable, and the production of numerical control equipment and modern scientific maintenance and management. The purpose of the research is to provide test equipment work show high-grade numerical control machine dynamic performance, another purpose of study is to provide the critical test technology, and reveals the dynamic performance of faults and development, the deterioration of the accuracy of the factors that lead.
An Acoustic Source Localization Method Based on Equal Distances Multi-Sensors Array
Authors: Wang Xing Wang , Sun Bing Yi , Li Bin , He Li Li , Hu Cheng Quan
Published: November 2012

The traditional acoustic source is sensitive to time. A novel sound source location method using linear intersection spacing multi-sensors array is provided in this paper. Each array is composed of three spaced nodes, and least squares method is used to calculate the final position according to ternary array results. Multi-arrays method is more robust than the ternary one, and much wider scope is covered. Location scope extends from 120m to 800m when the relative positioning error is 10%. A multi-array group based on linear intersection sound source localization method is provided in this paper too. Experiment results show that the proposed method has higher precision on angle locating than distance locating.
Research on Wideband Guiding System Receiving Technology
Authors: Chen Yong Li , Lv Shu Yong
Published: November 2012

The ultra-high speed data acquisition system is introduced, which has sampling rate of 3GSPS. The design scheme of hardware circuit is given in condition to analyze the theory and technology of signal sampling. The design of the main part circuit is described. The module of serial -parallel conversion and FFT spectrum analysis are designed in software realization. The system has strong commonality because of application of the ADC + FPGA + DSP framework.
Microcontroller System Design for Robotic Vehicles
Authors: Liu Chien Yuan , Chen Cheng Yi , Huang C.F.
Published: November 2012

In this paper, a microcontroller system designed for economic robotic vehicles was presented. The system is consisted of hardware and software design. In the hardware design, the layout of the main control PCB was designed and implemented by the researchers themselves. The software function currently merely specified the obstacles avoiding capability for verifying the design of the integrated system. Performance evaluation was conducted to prove the effectiveness and the response time of this system. The results showed that the vehicle could pass the lane stuffed with obstacles in expected time limit.
Study of a Novel Demodulation Method for FBG Sensor
Authors: Wang Lu , Peng Bao Jin , Xu Fei , Wu Dan , Wu Hao Wei
Published: November 2012

A novel demodulation method for Fiber Bragg Grating (FBG) sensor based on matching grating demodulation is proposed. It is means using several fiber gratings to cascade, and programming to make the computer automatically select different wavelengths. So that it can expand demodulation range based on high sensitivity. The photoelectric detector (PD) makes the reflected light intensity which form FBG change into voltage. And the voltage is amplified to 0~5v by amplifying circuit. Then through the data collection box, voltage sent to computer for data acquiring. Real-time analysis data and display the variable of center wavelength for sensing FBG. Because the same type of sensing FBG and demodulation FBG, they have the same temperature drift, so it can control the influence of environmental temperature. Therefore, this system can successfully solve the temperature/strain cross-sensitivity issue. The experimental results show that it is feasible to demodulate wavelength using the cascaded FBG. And the experimental measuring wavelength error is less than 0.009 nm, the measuring micro-strain error is less than 7.5με.
M Optimized Multi Virtual Gravity
Authors: Yuan Li Peng , Yuan Li Ming , Lu Hong Ying
Published: November 2012

A popular hypothesis regarding legged locomotion is that humans and other large animals walk and run in a manner that minimizes the metabolic energy expenditure for locomotion. Here, we just consider the walking gait patterns. And we presented a hybrid model for a passive 2D walker with knees and point feet. The dynamics of this model were fully derived analytically. We have also proposed optimized virtual passive control laws This is also a simple and effective gait-generation method based on this kneed walker model, which imitates the energy and torque behaviors in every walking cycle. Following the proposed method, we use computer optimization to find which gaits are indeed energetically optimal for this model. We prove some walking rules maybe true by the results of simulations and experiments on the existing walking robot.
Study on Multidisciplinary Design Optimization of 3-RRS Parallel Robot
Authors: Zhang Jing , Li Bai Lin
Published: November 2012

The paper aims to apply the idea of multidisciplinary design optimization to the design of robot system. The main idea of collaborative optimization is introduced. The collaborative optimization frame of 3-RRS parallel robot is analyzed. With the method of genetic algorithm and Sequential Quadratic Programming, the investigation is made on the executing collaborative optimization of working stroke, driving performance and hydraulic components. The numerical results indicate that the collaborative optimization can be successfully applied to dealing with the complex robot system, and lay a foundation to solve more complex mechanical system.
Modeling and Simulation Research of NC Machine Servo System Based on Fuzzy PID Control
Authors: Ao Mao Yao
Published: November 2012

Traditional PID control has not been able to meet the control requirements. This paper has designed one type of Fuzzy PID controller to use in NC Machine Servo System. Simulate the response of Fuzzy PID controller and traditional PID controller by Simulink in MATLAB. The simulation results indicated that the Fuzzy PID controller had quick response speed, strong robustness, high precision and non-overshoot etc. It improved the whole control performance of NC Machine Servo System.
Reform of CNC Machine Tool and Programming Based on CDIO Model
Authors: Liu Jing Ping , Li Yu Zhong
Published: November 2012

CNC machine tools and programming is a professional core curriculum of the vocational colleges in machinery manufacturing and automation, and CNC machining technology. This course involves teaching and professional practice, which requires us to improve teaching methods, improve the quality of teaching to promote students 'understanding of CNC machine tools and programming course and mastery, in order to develop students' practical capacity. In this paper, we use the conception, design, implementation, and operation of the CDIO model implementation of teaching reform, providing engineering teaching model with a new teaching ideas, and this also plays an active role in the training to cultivate innovative talents.
Research of Virtual Cutting Based on Hap Tic Feedback
Authors: Zhou Yan , Hu Deng Ming
Published: November 2012

As product design has entered the stage of green design, virtual design becomes increasingly important, and cutting research is the core of it. This paper established a basic virtual cutting system and the grid models of virtual objects based on PHANTOM Omni hap tic feedback device and its system development toolkit and built up oriented bounding box and operated bounding box collision detection. On the base of these, the paper also presented a new method of cutting force condition judgment of cutting tool, and gave the cutting path planning and grid model reconstruction on the basis of virtual cutting methods of triangular grid unit model. At last, the paper researched the virtual cutting of grid model using computer programming language, providing design methods for product design. The relative methods may advance the effect of product design drastically.
Virtual Design of a New Type of Entertainment Machine and Dynamics Simulation of the Conveyor Track
Authors: Bai Wei , Li Pu Lin , Wang Jun Liang
Published: November 2012

This paper proposes a new educational strategy tower of defensive warfare entertainment machine which relies on linkage institutions, introduces two sets of role and combines with strategic defense warfare game ideology. Based on the virtual prototype of modeling which is made by SolidWorks and 3DMAX and a dynamics analysis on hitting force and friction of the opposition role in the attack on track and recycling process, it explains the feasibility of manufacture of the new entertainment machine.
Research on Dynamics of Double-Mesh Helical Gear Set
Authors: Yang Fu Chun , Huang Qi Lin , Wang Yong , Wang Jun Gang
Published: November 2012

A dynamic model of double-mesh helical gear set was established including the torsional vibration, axial vibration and time varying mesh stiffness. The natural modes were systematically analyzed and classified into three types: rotational vibration mode, axial vibration mode and overall vibration mode. The influence of time varying mesh stiffness and the dynamic responses of the gear set were also investigated. The results showed that several natural frequencies are excited in the dynamic response and there is a frequency sensitive area which may cause large dynamic load.
Design and Aerodynamic Assessment of Diffuser with Longitudinal Separators for Underbody of Sedan
Authors: Hu Xing Jun , Zhang Rui , Ye Jian , Yan Xu , Zhao Zhi Ming
Published: November 2012

The aerodynamic characteristics have a great influence on the steering stability and the fuel economics of a high speed vehicle. The diffuser located at the aft part of a car underbody is one of the most important aerodynamic add-on devices. The parameters of the diffuser, including the diffuser angle, the number and the relative position of longitudinal separator (LS), the shape of the end plate and etc, will affect the underbody flow and the wake. Here, diffuser with longitudinal separator of different number and relative position was investigated. Numerical simulation was used to study the aerodynamic characteristics of a simplified sedan with different diffuser of longitudinal separator. The study found aerodynamic coefficient of the car changes little when we change the relative position of diffuser's longitudinal separator. Besides, we also found that increasing the number of the diffuser's longitudinal separator will increase the vehicle's aerodynamic drag coefficient and reduce the vehicle's lift coefficient.
Study on Ride Comfort of Non-Linear Vehicle Vibration System
Authors: Jing Hai Yan , Zheng Yan Ping , Fang Ming Xia
Published: November 2012

Based on the mathematical model of non-linear rubber bearings under the condition of random excitation and time domain model of road roughness, the 11-dof vibrant model for vehicle was built with considering the non-linear rubber bearings. Then the influence of the rubber bearings on ride comfort was simulated under the condition on the B-class road profile by different speed as the random input. The result shows that the way of modeling the vibrant model is feasible, and the influence is not a simple monotone function, especially in the barycenter acceleration of vehicle body.
Parameter Design of Less-Teeth Gear Transmission
Authors: Wang Bao Min , Dong Long Zhi , Cheng Wei
Published: November 2012

How to reasonably design parameters for less-teeth gear transmission is a hard and significant work. In this paper, firstly, according to characteristics of less-teeth transmission, list a series of mathematical expressions. Secondly, edit the flow chart to edit program based on Matlab and design the man-machine interface, then got a group optimal parameters. Finally, use the optimal parameters to build 3D model of less-teeth gear.
Efficiency Sensitivity of Two-Stage Planetary Gear Transmission System Based on Graph Theory
Authors: Chen Ming
Published: November 2012

This paper first establishes the graphic model and basic circuit equation of dual planetary gear transmission system based on modified complex joint picture representation method and basic circuit method. And then according to this model analyses the rotating relation and torque relation of dual planetary gear transmission system deduces the calculation formula of transmission rate efficiency. The sensitivity of each gear ratio to transmission efficiency is defined with the method of sensitivity analysis. By calculation and analysis, the influence degree of each gear ratio on transmission efficiency is obtained. The result can provide a basis for the design and optimization of dual planetary gear transmission system.
The Gap Nonlinear Characteristics of Gear Transmission System under External Excitation
Authors: Huang Kang , Li Jue , Jin Xin , Chen Qi
Published: November 2012

For the study of nonlinear dynamic characteristics of a pair of gears in an external torque under gear meshing error excitation, we will establish two degrees of freedom nonlinear torsional vibration model. The use of Matlab / Simulink for numerical simulation solves the nonlinear dynamic model of the gear gap. Study the dynamic characteristics of the system in a certain domain of parameters on external incentive conditions, as well as external motivation of gear transmission system dynamic characteristics influence. The results have important practical value for future engineering practice on gear transmission system's dynamic design, and have important theoretical significance for complex gear transmission system dynamics study.
Calculation Equation of Tooth Face of Shaping Gear for Logarithmic Spiral Bevel Gear
Authors: Li Qiang , Yang Gao Wei , Yan Hong Bo
Published: November 2012

According to the processing principle of the spiral bevel gear, analyzed the relative motion of cutter and workpiece in process. Combing the feature of logarithmic spiral bevel gear, this paper took the advantage of the gyration vector expansion to derivate the tooth surface equation of logarithmic spiral bevel gear shaping gear and deduced the meshing equation.
Numerical Simulation of Uprooting of Cassava Root
Authors: Yang Wang , Cai Gan Wei , Yang Jian , Li Zhao Jun
Published: November 2012

Based on the methods including modified Mohr-Coulomb yield criterion, Lagrange and smoothed particle hydrodynamics (SPH), the cassava stem - root - soil system dynamics simulation model is established by ANSYS/ LS-DYNA. The interaction mechanisms between uprooted cassava root and soil are discovered. The processes of soil shearing and the changing processes of root's stress are analyzed. The studies show that (1) the effects of root being extruded on the soil expand gradually from inside to outside in the process of uprooting, and the uprooted force reaches the maximum value when the soil appears ring shear rupture; (2) after the uprooted force reaches the maximum value, the root's effective stress still increases gradually with the increasing of its bending deformation until the soil is separated,and root's maximum effective stress appears in the combination of the root and stem where is the most easily to be broken;(3)when the maximum uprooted force on cassava root is analyzed, the interaction of a disc and its extension on the soil is regarded as the mechanical model of maximum uprooted force on cassava root.
Parametric Modeling of Whole Tower Crane Based on ANSYS
Authors: Li Bin , Zhang Hong , Xu Shao Shuai , Zhang Jin Sheng , Zhao Xin
Published: November 2012

The conventional finite element modeling of the tower in the ANSYS GUI, in particular, the modeling of the whole tower crane which is large and complex, always gives rise to low efficiency and less authenticity. A new method of modeling of whole tower crane is presented here. This paper applies the APDL which stands for ANSYS Parametric Design Language to separately build crane’s components :the mast, the tower head, the counter-jib ,the jib and the simplified slewing platform. And then accomplishes the parametric finite element model of the whole tower by using the assembly and connection technology provided by ANSYS to assemble and connect them. Further, based on these methods and Visual Basic Programming Software, the parametric design software on tower crane has been developed. At the end of the paper, the paper takes the H25/23 tower crane as an analysis example to demonstrate that such a method is not only technically feasible, but also cost-effective. The details of the parameterized modeling and related technologies are given in the paper.
Fuzzy Finite Element Applications in the Waste Heat Boiler
Authors: Li Chao , Liu Chang Hong , Qin Xin Chuan , Li Yong Tai
Published: November 2012

A practical approach for analyzing the waste heat boiler with fuzzy parameters is developed. The methodology involves integrated finite element modeling and fuzzy analysis. The uncertainties in the material, loading and structural properties are represented using convex normal fuzzy sets. Vertex solution methodology that is based on α-cut representation is used for the fuzzy analysis. The values of the extreme responses at an α-level are obtained by applying the binary combinations of the fuzzy variables that result in extreme responses to the finite element model. The merit of the proposed methodology is computational efficiency without compromise on accuracy and this is demonstrated through the engineering problem.
Modeling and Simulation Technology of Complex Mechanical Systems
Authors: Lin Bin , Zhu Meng Lai , Liu Xiao Gang
Published: November 2012

Reasonable simplification of finite element modeling of complex mechanical systems can reduce the amount of elements and nodes. The solution efficiency is improved in this way, which is of great economic significance in the practical engineering problem. Based on the modeling and simulation of a Conveyor System between Roving Frame and Spine Frame in automated textile production line, this paper investigates and proves the effectiveness of simplification of the complex mechanical system in the dominant finite element software – ANSYS. Results of static analysis of the simplified model agree well with the actual data, proving that the simplified solid-beam element model of the Conveyor System is reasonable. The results lay the foundation for the subsequent kinetic analysis and optimal design of complex mechanical system.
A Multiresolution Fairing Approach for NURBS Curves
Authors: Li Ai Min , Tian Hai Bo
Published: November 2012

Curve fairing has an important influence on curve editing and geometric modeling. Though there has been several different kinds of fairing methods, Multiresolution curve fairing has higher efficiency and simpler algorithms. Different from existing multiresolution curve fairing, a new multiresolution approach is presented based on non-uniform semiorthogonal B-spline wavelets, which can be applied for NURBS curve fairing. It has no restriction to B-spline curves’ knot sequence. This method effectively overcomes the limit of uniform or quasi-uniform B-spline wavelets for fairing. A detailed example is given to show the effectiveness of this multiresolution fairing method.
Low Cost CPM Machine for Knee Joint
Authors: Metan S.S. , Krishna Prasad , Mohankumar G.C.
Published: November 2012

In today’s world of industrialization, no single branch of Engineering and Technology can be considered independently. In order to increase productivity and profitability, industrial products are designed with the technology involving Mechanical and Electronics principles i.e. Mechatronics. Mechatronics has a vital importance in various fields such as agricultural, aviation, automobile, medical, etc. The scope of present work is to design, manufacture and test the low cost knee Continuous Passive Motion (CPM) machine. By using motorized device of CPM machine, we can gradually move the knee joints. This is not possible actively to the patient due to pain. The knee joint motion without patient’s muscular effort is called as passive motion. The machine designed and developed in present work can achieve this. Once the patient is able to use his muscular power for his active joint motion, CPM is no longer medically necessary. In the present work, design and manufacturing of the Low Cost Knee CPM machine has been successfully done and is elaborated. The machine was manufactured and tested at one of the renowned Hospitals in Sholapur-India. The patient is exercised on CPM machine for three weeks and is observed to be improved to normal condition i.e. normal Range of Motion (ROM).
Research on Complex Precision Mechanical System Assembly Parallel Control System
Authors: Wu Bao Zhong , Qiu Jing , Li Guo Xi , Gong Jing Zhong
Published: November 2012

To achieve the assembly process control of aerospace complex precision mechanical systems and ensure its dynamic characteristics, parallel control theory and methodology is used in the assembly process. The main point is: assembly parallel control system is built corresponding to the actual assembly ones. The ultimate quality of assembly is guaranteed via alignment influence analysis on the dynamics characteristics of the assembly joint structural and the assembly machine and the dynamic characteristics-oriented alignment process optimization and decision-making to carry out computing operator and process decision-making in the assembly process. The dissertation ,regarding space sophisticated mechanical system assembly and its dynamic characteristics as study object, introduced the parallel control thought, presented the overall framework of assembly parallel control, built the assembly parallel control system(APCS) and given the main process and implement of assembly parallel control.
Research of Phase Compensation Technology in Electronic Instrument Transformer
Authors: Huang You Peng , Chen Rui Min , Xiao Yong , Sun Wei Ming , Pan Feng
Published: November 2012

Introduces the analog phase compensation technology used in electronic instrument transformer, put forward a method of digital phase compensation in electronic transformer and carries out in the 220KV electronic instrument transformer measurement system, the resolution ratio of the phase compensation is 1 second and the maximum range of the phase compensation is 270 second, which can meet the phase adjustment of electronic instrument transformer; compares the analog compensation technology and digital phase compensation technology, analyzes their characteristics and different applications.
Robust Suboptimal Control of an Electro-Hydraulic System with Variable Supply Pressure
Authors: Zhang Min , Wang Jin , Huang Guo Bing
Published: November 2012

In this study, a robust H2 suboptimal control method is proposed for an electro-hydraulic system with variable supply pressure. The H2 suboptimal controller is designed to minimize the sum of a quadratic performance criterion and the H2 norm of the closed-loop transfer function from the white noise disturbance to the system state space variables. The genetic algorithm is used to select the weighting matrices of the quadratic performance criterion. In order to improve the robust performance, parameter uncertainties of the electro-hydraulic system are considered in the process of genetic search. Simulation results demonstrate the effectiveness of the proposed approach.
Experimental Study of Vertical Axis Wind Turbine with Wind Speed Self-Adapting
Authors: Xu Ming Wei , Qu Jian Jun , Zhang Han
Published: November 2012

A small vertical axis wind turbine with wind speed self-adapting was designed. The diameter and height of the turbine were both 0.7m. It featured that the blades were composed of movable and fixed blades, and the opening and closing of the movable blades realized the wind speed self-adapting. Aerodynamic performance of this new kind turbine was tested in a simple wind tunnel. Then the self-starting and power coefficient of the turbine were studied. The turbine with load could reliably self-start and operate stably even when the wind velocity was only 3.6 m/s. When the wind velocity was 8 m/s and the load torque was 0.1Nm, the movable blades no longer opened and the wind turbine realized the conversion from drag mode to lift mode. With the increase of wind speed, the maximum power coefficient of the turbine also improves gradually. Under 8 m/s wind speed, the maximum power coefficient of the turbine reaches to 12.26%. The experimental results showed that the new turbine not only improved the self-starting ability of the lift-style turbine, but also had a higher power coefficient in low tip speed ratio.
Research on Simulation of SRM Drive System Based on Simulink
Authors: Meng Xiang Zhong , Wang Jiang Hong
Published: November 2012

A well-performed switched reluctance motor drive system was designed, and the diagram of the hardware on the basis of control system by TMS320F28335 chip was given. A fuzzy PI control method is developed to control SRM in drive system. On the platform of MATLAB/Simulink, the SRM drive system was researched and simulated. The stability of system is analyzed. The results indicated that the performance of SRM speed control system by fuzzy PI control algorithm is obviously better than that by conventional PI control algorithm.
Study on Field Seedling Raising Vacuum-Vibration Tray Precision Seeder’s Horizontal Adjustment Mechanism
Authors: Gong Zhi Qiang , Chen Jin , Li Yao Ming , Wang Cheng Jun , Hang Chao
Published: November 2012

The study describes the characteristic of field seedling vacuum-vibration tray precision seeder, discuses the necessity for horizontal adjustment on the precision seeder. Horizontal adjustment parallel mechanism is designed, DOF and characteristics of parallel mechanism’s moving platform are systematically analysized, proved the mechanism can meet the horizontal adjustment of two-level tilt angle,which provided a theoretical basis for horizontal adjustment of the seeder.
Design and Realization of the Optimization System for ZLZ/ZLY Reducer
Authors: Qin Ru Ming , Li Shi Ying
Published: November 2012

Based on the platform of Visual Basic6.0, Visual FoxPro6.0 and Visual LISP, the optimal design system is developed by establishing mathematical model for optimization design of ZLZ/ZLY reducer and using integer optimal method and visual combination software development technology. The system consists of several exe executable programs and lsp programs. Under the control of internal interface program, the system can realize multi-objective integer optimization design and gear parts drawing.
Optimization Analysis Based on the Articulated Structure of Cement Floor All-Terrain Vehicle
Authors: Meng Zhong Liang , He Fu Qiang , Guan Qi Ming , Wang Hua Dong
Published: November 2012

In allusion to the actual working condition of the articulated steering mechanism of the all-terrain vehicle which is in normal running while steering, the target in this paper is to optimize the positions of link joints on the model structures based on the application and motion state of mathematical modeling on the multi-body kinetic software Recurdyn, analyzing the motion and force of the key joints, and to do the structural adjustment on the optimal positions of two link joints. The optimization results indicate that the revolving speed and force are within the allowed limits and guaranteed that the turn radius would be the maximum and the force would be the minimum within the limits.
Structural Parameters Optimization of Parallel Stable Platform Based on Physical Programming
Authors: Dong Zhong Hui , Ding Hong Sheng , Jiang Fang , Huang Zhi Chen , Fu Tie
Published: November 2012

Based on the parallel stable platform of 6-UPS, Jacobi matrix condition number and driving force of six rods are respectively identified as kinematics evaluation index and dynamics evaluation index of the parallel stable platform. By using physical programming preference functions the comprehensive preference function are constructed. Thus, a multi-objective optimization problem is formulated as a single objective optimization problem. Structural parameters with best working performance are computed by the genetic algorithm. Simulation results in Matlab show that the performance of optimization platform has been improved.
A Novel Radial Telescopic Tire Building Drum and its Kinematics Design
Authors: Wang Yun Long , Zhang Lei , Yang Yu Hu
Published: November 2012

A novel radial telescopic tire building drum is proposed to meet the radial tire production requirements. After the discussion of the mechanical structure and transmission principle of this mechanism, the kinematics equations together with the formulas of contraction ratio and pressure angle are established. In order to optimize the characteristics of force-transfer, when taking the interference condition into consideration, a kinematics design method of this novel radial telescopic building drum is proposed, which can obtain the minimal value of mechanism maximum pressure angle and satisfy the demand of contraction ratio. The most important feature of this building drum is that the external shell is driven by the internal shell. Designer can derivative more design schemes by applying this transmission principle.
Structural Design of the Vermicelli Strapping Machine
Authors: Wang Shou Jun , Wei Ren Zhe
Published: November 2012

This paper introduced the design requirements, structure, as well as the working principle of vermicelli strapping machine. The process of strapping mainly divided into two steps. The first step is to make the cotton thread wrapped around the vermicelli, during which, the speed of wrapping is greatly improved because the distance of the winding is shorten by the innovative teardrop-shaped winding track. The second step is to knot the cotton thread that wrapped the vermicelli. The type of knot used in this strapping machine can be implemented on machine; besides, the knot is so tight that it’s not easy to be loosed. By adjusting the position of knotting structure, the gap of bundled vermicelli is reduced. As a result, the vermicelli will be strapped tight.
A Study on the Automatic Feeding Device for Optical Fibre Adapter Base
Authors: Han Liang , Pang Yun Tian , Lei Min
Published: November 2012

Optical fibre connnector is the most typical optical passive device in optical fibre communication industry with its various categories and structures. Optical fibre adapter is indispensable component when optical fibre connectors connect to each other. The base is the key element of optical fibre adapter. But its feeding in the factory is completely done by hand. This way is of great labour intensity and low production efficiency, so it can not meet the production need. This paper aims to design a compound automatic feeding device for the optical fibre adapter base. The device includes five modules: vibration screening mechanism, jacking-up mechanism, opening-closing mechanism, combiner mechanism, linear vibratory conveying mechanism, is to complete the automatic feeding. The control system is based on MCS51 singlechip computer technology. Through the research, it can be a good solution to the automatic feeding of the opical fibre adapter base.
A Conceptual Design of the Knee Rehabilitation Device
Authors: Han Liang , Li You Yang , Zhang Qian
Published: November 2012

This paper aims to design a knee rehabilitation device which can help the knee patients to perform movement in bending leg manner. And in that way the rehabilitation process will be improved greatly. The design of the device includes the mechanical main body design, driving motor, and control circuit which contains the keyboard setting, display unit and clock unit. Through the pulse width modulation (PWM) technology the stepping motor is driven and the automatic bent in leg is achieved. During the exercise the following information is known: the starting time, the lasting time, the angle of movement and the speed of movement. The micro controller unit (MCU) is responsible for the information processing from both the key and liquid crystal display (LCD). After the key inputs the given parameters the stepping motor can output the desired motions. Meanwhile, the LCD can display the input information. Now the project has accomplished the preliminary design, and the concrete scheme is shown in this paper.
Design Optimization for Double-T Root and Rim of Turbine Blade with Three-Dimensional Finite Element Method
Authors: Zhang Ming Hui , Zhang Di , Xie Yong Hui
Published: November 2012

As the main bearing part in a turbine blade, the root carries most of the loads of the whole blade. The improvement of the root structure can be used to enhance the operation reliability of steam turbine. The research on design optimization for double-T root and rim of a turbine blade was conducted by three-dimensional finite element method. Based on the APDL (ANSYS parametric design language), a multi-variable parametric model of the double-T root and rim was established. Twelve characteristic geometrical variables of the root-rim were optimized to minimize the maximum equivalent stress. The optimal structure of the double-T root-rim is obtained through the optimization. Compared with the original structure, the equivalent stress level of the root and rim has a significant reduction. Specifically, the maximum equivalent stress of root and rim reduces by 14.25% and 13.59%, respectively.
Research on Verfiable Design Model for Design Defect of Mechanical Assembly
Authors: Su Yong Sheng , Fan Shou Wen
Published: November 2012

Final assembly deviations of mechanical products are determined by accumulation, coupling and propagation of all parts tolerances in the assembly system, whether the final assembly meets the design specification or not can only be obtained after the assembly is completed. The verifiable design model in this paper took object-oriented Petri net as logic lever carrier, and embedded deviation in form of matrix to Petri net, and then analyzed and calculated the assembly deviation from the logical and numerical lever synchronically, after that the final cumulative deviation is obtained. If the cumulative deviation exceeded precision limit, key influence factors to the cumulative deviation could be analyzed. The assembly design defect is identified and located in the design process, and the synchronization of design and verification is achieved. This model has some excellent characteristics, such as modularization, reusability, and capability to describe structural logical relationships.
Analysis and Optimization Design of Raking Coal Manipulator Based on ANSYS
Authors: Fan Bing Hui , Min Feng , Yuan Cheng Zhi
Published: November 2012

In this paper statics analysis and optimization design are made for shovel of raking coal manipulator with ANSYS. On the premise of satisfying strength and displacement, improve structure performance further. In addition, theory basis is provided for whether shovel meets working conditions.
Study on Design of Ratchet-Pawl Clutch in Winder
Authors: Zhou Guo Qing , Yuan Ru Wang , Jiang Xiu Ming
Published: November 2012

Basing on an analysis on the motion cycle switching of yarn splicing device and tube changing device of an automatic twisting winder using ratchet-pawl clutch, this paper studies the self-locking conditions of the ratchet-pawl clutch, the rotation angle and revolution angle for separation of the pawl, the pawl escapement and the pawl disk locating device, gets the calculation method and design formulas for functional parameters of the ratchet-pawl clutch, and finds out the conditions for whole circle rotation and precise locating of the pawl disk.
A Novel Two Degrees of Freedom Rotational Decoupled Parallel Mechanism
Authors: Hou Yu Lei , Zeng Da Xing , Zhang Zhan Ye , Wang Chang Mei , Hu Xin Zhe
Published: November 2012

In the field of spatial orientation, the rotational parallel mechanism is widely used. While the existence of coupling brings about the parallel mechanism some difficulties in kinematics and dynamic analysis, the development of control system, and so on. This condition restricts the application fields and effects of the rotational parallel mechanism. Therefore, this paper proposes a novel 2-DOF (two degrees of freedom) rotational DPM (decoupled parallel mechanism). The feature of the mechanism is described and their movement form is analyzed with screw theory. The proposition of the novel rotational DPM will enrich the configurations of the parallel mechanism, and the contents of this paper should be useful for the further research and application of the rotational parallel mechanism.
Research on Modeling and Simulation of Electric Power Steering System for Electric Power Bus
Authors: Shen Rong Wei , Tai Xiao Hong
Published: November 2012

A kind of recirculating ball-type power steering system for electric power bus was designed. The dynamics equations of EPS were analyzed. The simulation model based Matlab/Simulation was build and verified by the experiments on test-bed. Then the simulation test was carried out when vehicle was stationary. The simulation results verify the validity of the simulation model, which creates the research basis for further research of control strategies.
Parametric and Optimum Design of Cylinder Mechanism Based on Statics and Modal Analysis
Authors: Yang Fu Qin , Zhang Hong Tao , Zong Rong , Chang De Gong
Published: November 2012

Collaborative simulation on characteristic parameters of the cylinder mechanism was realized by Pro/E and AWE software. Optimum allocation about the structure parameters like wall thickness, width, diameter and speed was completed based on comprehensive consideration of static strength and stiffness and dynamic characteristics of modal. The simulation result shows that the optimization scheme was beneficial to the yield and quality of cardings which lays the foundation for further development of the cylinder mechanism.
The Data Analysis and Decision of Designation and Optimization on Incline Car Brake Equipment
Authors: Tang Gu Sheng , Wang Qi Ming
Published: November 2012

In the paper, the kinetics of the mine car when it sports on the slope are analysized and calculated, characteristics of the rope brake energy absorption are designed and studied.
High Efficient Viscoelastic Damper for Heavy Trucks
Authors: Zhang Sai Fei , Liu Xiao Ling , Liu Yong
Published: November 2012

In this paper, a new viscoelastic damper design for heavy trucks is presented and a calculation formula of viscous damping force considering the effect of Viscoelastic Fluids (VF) flow rate is carried out. By numerically simulating this equation, curves of the viscoelastic damper performance curve is obtained, and the results show that theoretical calculation result and the test results are well consistent, with the exception at the start point. Theoretical curves are more plumpness in compared with test curves.
Study on the 4-PTT Variable Topology Parallel Chinese Massage Manipulator
Authors: Sun Shu Hua
Published: November 2012

In the paper, virtual prototype parallel chinese massage manipulator was designed based on the technique kinematics and dynamics analysis in Chinese massage technique and on the 4-PTT variable topology parallel mechanism.At the same time, for an example the pushing method,simulation analysis for the kinematic and dynamic of the virtual prototype were studied.
Principle and Approach for Determining the Reasonable Cross-Section of the Solid-Web Double-Beam Component
Authors: Li Ai Feng
Published: November 2012

Solid-web double-beam component is widely used in the dipper handle of excavator, whose mechanical behaviour belongs to compression-bending member and mainly satisfies the strength requirement. In this paper, it starts from the design principles of steel structure and elastic theory, determines the dimension of the main cross-section and the reverse tube under guidance of optimization, and provides initial data for the detailed design. The method has common direct sense.