bluuebunny/crossref_metadata_2025 huggingface dataset:
Failure Analysis and Transmission Parameters Optimization Design of WN Gears Drive
Authors: Mu Xiao Kai , Li Yu Guang , Chen Dian Hua , Li Cheng Chao
Published: November 2012

This paper taking the high strength of WN gears drive as target, which makes the WN gear device has light weight and compact size. The WN gears drive optimization design model of actual project is put forward by multiple-factor comprehensive failure analysis. The research is to solve nonlinear constrained optimization problems by the method of sequence quadratic programming (SQP) in MATLAB optimization toolbox. Using the optimization program of engineering design examples to analyze the relationship about gear drive parameters on contact and bending fatigue strength, thus the engineering design method of the WN gears drive is improved. This research not only achieved the optimization design of WN gears drive, but also revealed that the interactions between transmission parameters and strength design of the gear, which improved design efficiency and provided application foundation for CAD design of WN gears driving.
Dynamic Finite Element Analysis and Experimental Study of Rotating Column in Cylinder
Authors: Li Zhi Miao , Liu Ju Bao , Luo Min , Zhang Qiang
Published: November 2012

Rotary slender column in cylinder is a special structure in oil engineering. It contacts with outer cylinder and interacts with its inner pipe fluid and outer annular fluid. A partitioned coupling model was founded by dispersing slender column into beam element, dividing fluid domain into some sections, dispersing fluid section into hexahedron unit and transfer method of the information of coupling interface was described. Dynamics experimental device of column-liquid interaction was built to do column rotating test with considering the displacement and force boundary conditions of rotating column and testing axial excitation force of bottom column, axial acceleration of head column, transverse displacement of columns and collision and contact forces between inner columns and outer pipeline. The maximum absolute error between experimental results and numerical results is 0.31mm and this research provides the methods of numerical simulation and experimental study.
Meshing Method of FEM in Large Complex Structural Simulations
Authors: Xue Yan Hua , Shao Bin , Wang Zhi Guang , Jiang Xin
Published: November 2012

Meshing is playing an important role in the large complex structural FEM simulations; it has a direct effect on calculating precision of structural simulations. For increasing the calculation accuracy and analysis accuracy of complex structure, the finite element meshing problems is proposed on the finite element analysis of large complicated structures. The effects caused by element type, mesh density and intergradations on calculating precision are studied and discussed. A research argues that with length-width ratio of 1~2 and length-thickness ration of 1.5~4.5 of two-dimensional rectangular element, the quality of meshing method of two-dimensional element is above normal. As the height of one-dimensional element is equal to the sum of reinforcing rib height of outer panel and half the thickness of panel, more accurate results can be obtained.
The Design of New Mechanism of Birdlike MAV
Authors: Zhai Hai Zhou
Published: November 2012

MAV- Micro Air Vehicle which acts like bird has attracted many studies because of outstanding aerodynamic property. Former studies on birdlike MAV with flapping wing had just focused on the flapping motion, but passed over the change of flapping angular velocity and deformation of wing, therefore lost the good aerodynamic capacity. One new mechanism of the birdlike MAV is designed and studied. The mechanism can bring out 3 motions at one time, including flapping, spanning and twisting, so has movement as bird. The kinematic performance including the flapping angle, flapping angular velocity, and the folding angle etc., has been studied and compared with other relative works. The design can help the birdlike aircraft into reality.
Statistical Calculations of Grinding Abrasive Number Based on Normal Distribution
Authors: Wang De Xiang , Ge Pei Qi , Zhang Lei , Zhu Zhen Jie
Published: November 2012

Sliding and plowing are discriminated based on Hertz contact, and the grain number statistics model is established considering that grain size and abrasive protrusion height fit normal distribution. The analysis shows that less than 5% of grains are contacting with workpiece in the grinding arc, about 96% of contacting grains plow and about 4% cut. Sliding grains accounting for contacting grains is about 0.2%, which is almost negligible.
Lightweight Design and Research of Box Girder for Double Girder Bridge Crane
Authors: Wang Quan Xian , Zhang Xiao Fei , Sun Cheng Bin
Published: November 2012

With a design of the box girder of bridge crane for the rectangular right track girder, rectangular side rail girder and two trapezoidal side rail girder, MATLAB optimization tool is carried out to calculate the discrete variable by homing method one by one. Then the discrete variable which is the thickness of the steel plate used in box girder is used to determine the shape of the cross-section of box girder.
The Air Tightness Test Method of the High Speed Train
Authors: Zhang Tao Tao , Wang Fei
Published: November 2012

The tightness of interior space in condition of a high speed train with its side door, side window closed called train air-tightness. The paper introduces the air tightness of the high speed train and the basic methods for air tightness testing. It also applies a constant pressure leak model to test and points out that the importance of air tightness for high speed train.
Analyses of Current Situation about Biomass Carbonization Stove
Authors: Li Yan Cong , Wan Sheng Mou , Wang Li , Chen Jin Cheng
Published: November 2012

By analyzing the current structure of biomass carbonization devices; the advantages and disadvantages of current devices are summarized. Aimed at the problems founded out, the carbonization furnace structure is improved. The designed new carbonization furnace not only solves the exist problems to some extent, but also has some reference values for the future carbonized stove design.
The Finite Element Analysis of Machine Tool Column of NC Gear Shaper Based on HyperWorks
Authors: Zhou Xiang Man , Tian Qi Hua , Du Yi Xian , Zhong Rui Ling
Published: November 2012

The 3D model of machine tool column of NC gear shaper is created in Pro/E. This model is imported into the HyperWorks by STEP file. The column structural static stress and deformation, the five-step modal natural frequencies and mode of vibration are obtained by Hyper Works static and dynamic analysis. Based on the analysis results, this study offers a kind of reference comments for the design and improvement of machine tool column of the gear shaper.
The Calculation Method and Experimental Research on Throttling Pressure Drop during Kill a Well
Authors: Liu Hui Xin , Yang Xian Min , Li Cheng Tao , Cheng Xiang
Published: November 2012

There is a common problem during kill a well, which is how to quickly and accurately control the surface casing pressure according to the requirements for killing a well. A step-by-step exploration process is employed on operation sites. Continuously adjusting throttle valve to acquire surface casing pressure may lead to failure of kill operation because of its long time and low control accuracy. Obviously, if the calculation problems of throttling drawdown can be resolved,the relationship between drawdown and throttle valve opening can be found and the course of explorating can be converted into a straight course.Then the success rate of killing well can be improved. More importantly, this can make automatic controll of surface casing pressure possible. The paper built the calculation method of throttling pressure drop by theoretical analysis and verified the calculation method by adopting it into field test. The result has showed that the calculation method of throttling pressure drop coincides with experimental results and it can be used in engineering practice.
Meshing Stiffness Analysis of Four Ring-Plate-Type Pin-Cycloidal Gear Planetary Drive
Authors: Zhang Xiu Yan , Dai Xiao Jun
Published: November 2012

The four ring-plate-type pin-cycloidal gear planetary drive is a new type of the cycloid. Use the new repair tooth profile gap mesh analysis method to Calculate the cycloid mesh stiffness. the mesh stiffness of the cycloid is solved, According to simulation results based on the ANSYS / LS-DYNA. and the results were compared with theoretical calculations, both mutual authentication. It can be use to improve the prototype program at last.
Tool Wear of Diamond Tools in Ultrasonic Vibration Turning Titanium Alloys
Authors: Zhou Zhi Min , Li Xiao Yan , Qu Yuan Xin , Na Jian
Published: November 2012

Titanium alloys, as difficult-to-cut materials, have poor machinability due to their superior mechanical properties, heat resistance and corrosion resistance. High cutting temperature and great cutting force that will greatly accelerate tool wear often occurs in titanium alloys cutting process. In this paper, an ultrasonic vibration turning method was used to lower diamond tool wear during TC4 titanium alloy turning process. Ultrasonic vibration turning tests were carried out with various cutting parameters. Experimental results indicated that there’s a significant reduction of the wear rate of diamond tools by means of ultrasonic vibration in TC4 turning process. For ultrasonic vibration turning, spindle speed, the amplitude and frequency of vibration of the tool are the greatest impact of tool wear, followed by feed rate, then the cutting depth.
An Improvement Design Research on the Structure of Precision Grinder
Authors: Li Rui Zhen , Zhai Peng , Wang Peng , Zhai Shao Peng
Published: November 2012

To increase the lower order natural frequency of MM7140 grinder’s support parts is an effective measure to improve structural rigidity, avoid resonance and reduce amplitude. The finite element models of MM7140's lathe bed and column, were established by 3-D software UG, and led into ANSYS for modal analysis. Then, found the column was the weak link based on the modal analysis results, and brought out the more effective improvement program. This paper offers a reliable basis for the design and renovation of MM7140 grinder.
Study of Dual-Fuel Engine Performance with Diesel-Natural Gas
Authors: Zhang Jia Xi , Zhao Yan Hui , Dai Xi Liang
Published: November 2012

This paper analyzes the basic combustion characteristics of dual-fuel engine with diesel-natural gas, including the engine’s running characteristics, the external characteristics and the low-load performance. Taking the development and application of natural gas for consideration, this paper also makes studies on how to improve the dynamic performance of the dual-fuel engine CA6110ZLA5N2.
The Research of ELID Grinding Effect and Surface Quality on Carbonized Cold-Rolled Steel
Authors: Guan J.L. , Zhu Li Li , Lu H.W. , Wang Zhi Wei
Published: November 2012

In this document, the electrolytic in-process dressing ( ELID ) grinding technique is used for ultra-precision processing experimental research on the carbonized cold-rolled steel (HRC60～80).A surface roughness of Ra6～8nm was obtained after ELID precision grinding. The results proved that adopting micro grain size (W1.5～W36) and high hardness cast iron based diamond grinding wheel, increasing the wheel peripheral velocity (18～20m/s) and reducing grinding depth can effectively improve surface quality and bring the surface roughness down. The wheel peripheral velocity, grinding depth as well as grinding fluid are the main factors during ultra-precision grinding.
Modeling a Finned Tube Evaporator for Engine Exhaust Heat Recovery
Authors: Wang En Hua , Zhang Hong Guang , Fan Bo Yuan
Published: November 2012

The evaporator is a critical component when using organic Rankine cycle (ORC) to recover waste heat from an internal combustion engine. Evaluating the amount of heat quantity that can be transferred in a designed evaporator is very important for a successful ORC system. In this paper, a finned tube evaporator used for recovering the exhaust waste heat of a diesel engine was presented. The mathematical model for the evaporator was set up according to the dimensions of the designed evaporator along with the specified working conditions of ORC. The evaporator performance was analyzed as the matched diesel engine operating at the rated power point. The results indicate that the heat transfer quantity of the designed evaporator can be reached at 76 kW, and the exhaust temperature at the evaporator exit can be reduced to 115°C.
The Calculation Method of Earth-Rock Allocation Balance and its Application for the Pumped Storage Hydropower Construction
Authors: Song Feng Lian , Liu Quan , Wu Wen Hong , Yang Wen Yong
Published: November 2012

There is a large number of excavation and filling in the construction of pumped-storage power station, and the filling materials are from the excavated materials. The construction planning is limited by the space, time and quantity, order, and its procedure directly affects the construction schedule. Based on relationships analysis of construction schedule and material quality, quantity and its balance, the spatial coordination of excavation, embankment partition and construction safety distance, three models are established which are excavation volume calculation model, the processing logic model and the excavate-transport-fill analysis model of earth-rock . Also, the dynamic balance and allocation of earth-rock for the main work construction are realized. The case analysis shows that this study will contribute to the management efficiency of project construction.
Fatigue Analysis of Wind Turbine
Authors: Ding Chao Yi , Li Gang Qiang , Guo Hong Che
Published: November 2012

This article combines with finite element method and the rain flow count method, which is using the nominal stress method developed a wind turbine used for structural fatigue analysis method, with 2.0 MW wind and machine hub to analyze the fatigue, calculated the operation lifespan fatigue load of wind turbine in the 20 years. By choosing the hot point of hub, analyzes the wheels fatigue damage characteristics. The calculation results show that: the selection of hot point wheels meet with the requirements of GL standard Fatigue design. This paper can be used in large wind turbine development design and in the process of production design authentication.
Matching Research on Commercial Vehicle Driveline Based on Cruise
Authors: Xia Zheng Peng , Liao Ping , Ni Hong Jun , Yuan Yin Nan
Published: November 2012

Take a commercial vehicle driven by rear-wheel as an example, the vehicle model is established using parameters of engine and vehicle based software CRUISE, and the method is introduced for calculating vehicle resistance based on data of the coasting test. The advantage and disadvantage of driveline were obtained among arbitrary combinations of driveline system with the existing three kinds of transmission and four kinds of retarder through the simulation and linear weighted combination method for dynamic dynamics property and fuel economy to convert to single target function. The results show that A2 / B1 is the best driveline solution which dose not only have good dynamic performance, but also good fuel economic. The selection basis is provided for power transmission system component through simulation for vehicle.
The Mechanical Model and Boundary Condition of Separated Zone Water Injection String’s Axial Force
Authors: Wen Hou Zhen , Wang Zun Ce , Lv Feng Xia
Published: November 2012

The oilfield need to calculate the packer’s displacement of separated zone water injection string. Analyzed the force of the separated zone water injection string, and established the physical model and mathematical model. Using the traditional boundary processing method of tubular mechanics to calculate the displacement of separated zone water injection string, discovered that the accuracy cannot meet the requirement of the oilfield. Therefore consider the influence of all packer’s frictional force on the water injection string’s stress condition, and propose a new method to deal with the boundary condition, compared the calculation results with magnetic location results, the calculation results can meet the accuracy requirements of oilfield.
Study on Crack Component Fatigue Life Analysis Based on SIF Fitting
Authors: Chen Yan , Sun Yuan Tao
Published: November 2012

The present structure crack analysis method simplifies the crack as type I crack, and put the stress intensity factor (SIF) mathematical expression of infinite plate under the bi-directional even stress load into Paris formula to analyse the fatigue life of crack components. Due to the finiteness and complexity of component shape and the nonuniformity of the stress distribution in the engineering practice, which makes the SIF value inaccuracy according to the present method, so that the result of crack fatigue life has a large error. Considering the shortcomings of the method, this paper offers a new method which is using the finite element method to calculate SIF in different crack length directly. By means of function fitting, this method determines the mathematical relation between SIF and the crack length and changes the form of Paris formula based on the relation. Furthermore, it can analyse the fatigue life of crack components and improve the analysis accuracy theoretically.
Study on Controlled Decomposition and Reuse of Waste Thermosetting Phenol Resin Based on Physical Methods
Authors: Wu Zhong Wei , Liu Guang Fu , Liu Zhi Feng , Pan Shao Bo
Published: November 2012

Various mechanical forces are used to promote the waste thermosetting phenol resin to produce the physical decomposition process. The molecular structure and physicochemical properties change, thus it obtains the reversible thermos plasticity and restore the processing performance. The paper proposes the regeneration principle based on physical methods, and smashing and regeneration experiments have been carried out. The optimized design for important factors of rotational speed, crushing time, feed, feed size and other parameters which impact crushing and regenerating effects has been carried out after experiments. Multivariate quadratic simulation equations are established and the order of significantly affecting the regeneration is determined.
Squeezing Impact Forces of the Deformation on a Cylindrical Roller
Authors: Beisembetov I. K. , Oteny Y. N. , Muraviev O. P. , Sikhimbayev M. R. , Absadykov B. N. , Arymbekov B. S. , Ussupov S. S , Sherov K. T. , Tkacheva Y. O.
Published: November 2012

The article examines the influence of compressive forces on the deformation of the cylindrical roller. We considered the features of deformation of two cylindrical bodies with identical elastic properties and elastic plastic deformation of the deforming element of the solid parts. Duing the process we calculated deformation of the cylindrical deforming element which is located between the two contracting rigid planar faces of it with a light contact and general deformations. It is shown that the relative deformation of the reels when they are loading does not depend much on the diameter, but depends only on the loading force. It’s produced by computer simulation of compression of a cylindrical roller with two absolutely rigid plates using the software like Pro/E, Solidworks and ANSYS. We obtain the results of experimental investigations of the deformation roller during its compression of flat plates with a hardness of HRC = 65. It was revealed that the deformation roller obtained experimentally is almost identical with the calculated values. It is shown that deformation of the roller shall not exceed two percent of its diameter, and in the calculations determining the parameters of the contact zone can not take into account its deformation.
Kinematic Analysis of a 2-DOF Planar Parallel Manipulator with Automated Selective Activation Mechanism to Avoid Singularities
Authors: Upendran V. , Dash Anjan Kumar
Published: November 2012

Parallel Manipulator has lot of applications in areas like flight/automobile simulators, earthquake simulators, milling machine, etc. Main disadvantage of parallel manipulator is the presence of singularities within the workspace. Due to this, entire workspace of a parallel manipulator cannot be used effectively. To overcome this disadvantage, an automated selective activation mechanism is proposed, designed and fabricated using solenoids, gear train and belt drive arrangement. By using this mechanism interior singularity are crossed and this enables the user to utilize the entire workspace. Selective activation mechanism with automation ability is designed in such a way that, depending on activation of solenoid, active joint of manipulator changes from one position to another, which subsequently changes the singularity curves. By changing active joint positions, 4 ways of operating manipulator are identified. For all type of operations, singularity curves are plotted using MATLAB.
Latest Research Progress of Amorphous Motors
Authors: Ma Guang Ying , Zhang Hong , Gao Jun , Ru Hai
Published: November 2012

The development of amorphous motors has been paid more and more attention. Different types of amorphous motors are designed, calculated, manufactured and tested. All of the motors achieve high efficiency and high torque density, especially in the high speed applications. However, few amorphous motors have been applied to practical applications. This paper reviews the newly development of amorphous motors. Several deficiencies limited the development of amorphous motors are discussed, and some effective improved methods are proposed.
Electric Field Distribution Analysis of ±1000kV DC Wall Bushing during Polarity Reversal
Authors: Zhang Li , Li Qing Min , Zhang Li Na , Cong Yu Di
Published: November 2012

±1000kV DC wall bushing under planning is a complex insulation system which bears the effects imposed by different working conditions. The electric field distribution is concentrated at the bushing outlet terminal, which might result in breakdown discharge especially when short-time abrupt conditions such as polarity reversal occur. In this paper, the finite element method is utilized to analyze electric field distribution and potential distribution of wall bushing during polarity reversal. Electric field distribution and potential distribution at the moment of polarity reversal are obtained, which provides value reference for the study of polarity reversal process.
First-Principles Study of TiC(111) Surface
Authors: Wang Li , Fang Teng , Gong Jian Hong
Published: November 2012

The structural and electronic properties of TiC(111) surfaces are calculated using the first-principles total-energy plane-wave pseudopotential method based on density functional theory. As a polar surface, (111) surface shows large charge depletion in the upper part of the atoms, while charge accumulation happens in the inferior part of the atoms, interlayer Ti-C chemical bonds are reinforced and the outermost interlayer distances are largely reduced. Meanwhile, the charge accumulation and depletion for Ti-terminated surface is more than that for C-terminated surface on the same position of the two slabs after full relaxation. The surface energy of C-terminated surface is in the range from 7.61 to 9.83 J/m2, much larger than that of Ti-terminated surface from 3.13 to 1.35 J/m2, and the Ti-terminated surface is thermodynamically more favorable over all of the range of (chemical potential of TiC slab). This present work makes a beneficial attempt at exploring TiC surface as an ab initio method for studying possible nucleation mechanism of Aluminum on it.
Design of Portable On-Board Charger
Authors: Cheng Deng Liang , Jiang Wei Rong , Mei Jian Wei
Published: November 2012

To solve the key technology of automotive lithium battery charging system, a new kind of smart portable on-board charger is developed. This battery charger takes single-chip machine of freescale as system control chip, realizes closed-loop control of bus voltage by the voltage pulse width modulation chip TL494, realizes charger output with constant voltage, constant current and switch without disturbances by the current pulse width modulation chip UC3846, achieves master-slave control mode for multi–parallel machines through the CAN bus technology. In addition, the microcontroller program realizes the process monitoring and fuzzy PID regulation, the charging process has multiple intelligent protection and external regulatory functions. The experimental results show that with dual regulations of the software and hardware, the charger has the advantages of stable reliability, flexible operation and precise intelligence, an effective exploration of the battery charging technology is carried out.
The Study of Movement Encoder with Low Cost and High Performance
Authors: Wang Xiao Wei
Published: November 2012

The paper proposes a design scheme of movement encoder with low cost and high performance. The scheme can provide higher precise rotor position signal for motor by a hall-effect latch and a linear hall-effect sensor, and it can also provide rotational speed and direction of motor by a winding with full pole distance, at last we deduce a torque balance equation based on speed and acceleration of motor. The study shows that the scheme with low cost have much higher position precision than traditional rotational transformer and hall-effect position sensor, and it does not exist amplitude error and phase error, function error is small. It is very worthy to the wide application of motor of electric bicycle, wind-driven generator, electric car, and servomotor, etc.
Research on Vibration of Transformer with DC Bias
Authors: Bai Bao Dong , Qu Bing Yin , Chen De Zhi , Zhang Bo , Jia Wu Hao
Published: November 2012

As the manufacturing technology of transformer getting more and more mature, issue of its vibration and noise is getting more and more attention. The vibration is more obviously when the transformer is running with DC Bias. 3D field-circuit coupling models of single-phase three-column power transformer was created by ANSYS. The simulating distributions of core magnetic flux density were obtained when the model was running with DC bias current of 0A, 0.9A and 2.6A. So were the modal shapes and curve of vibration-frequency of the transformer model. The theoretical guidance of reducing transformer vibration was obtained after analyzing the simulation result.
Research on BFV-SVPWM Control Strategy for Two Double-Y Shift 30° PMSM Series-Connected System
Authors: Shi Xian Jun , Liu Ling Shun , Zhou Shao Lei
Published: November 2012

Multi-motor drive system is one important area of the motion control research. In this paper, the working principle of single-inverter driving the series-connected system of two double Y-shift 30 ° PMSM is proposed. In order to achieve the better decouple operating of the two series-connected motors and improving the DC bus utilization, a novel control method of BFV-SVPWM for the system is presented. In Matlab/Simulink environment, variable-speed operations are simulated to verify that the proposed BFV-SVPWM control is strategy feasibility and superiority.
Analysis of Vibration and Noise in Transformer under DC Bias
Authors: Bai Bao Dong , Zhang Jian , Yang Guo Hui , Wang Jia Yin
Published: November 2012

DC bias would cause the half-wave saturation of transformer, distortion of the exaction current, generation of high harmonic and the vibration and noise increases rapidly, which harm the safe operation of the transformers. In this paper, simulation of magnetic vibration and noise of a 160KVA dry-type transformer with DC bias and modal analysis with the finite element software comsol multiphysics is obtained. The software conduct multi-physical field coupling analysis to electric field, magnetic field, structural stress field and acoustic field, calculate the distribution of the noise and the natural frequency of transformer and propose effective measures to reduce the noise and vibration of transformer with DC bias.
Analysis and Research on Influence of Seam on Power Transformer's Capacity on Restraining DC Bias
Authors: Chen De Zhi , Bai Bao Dong , Zhang Bo , Jia Wu Hao , Qu Bing Yin
Published: November 2012

Transformer is irreplaceable to make sure power system running stably. It's showed in research that magnetic resistance is relevant to capacity on restraining DC bias both in three-phase three-column transformer and three-phase five-column transformer. Magnetic resistance can be changed by changing the seam size of transformer. 3D field-circuit coupling models of single-phase four-column power transformer with two kinds of seam were created by FEA in this paper. Models were simulated with different DC bias current. The analysis result of influence of seam size on power transformer's capacity on restraining DC bias was obtained by DC bias current efficient extraction and comparison of models with different seam size, which is the theoretical basis of developing new transformer with more capacity on restraining DC bias.
Design and Experimental of High-Performance Interior PMSM with the Aid of Identical Polarization Embedding
Authors: An Yue Jun , Xue Li Ping , Meng Zhao Jun , Zhou Li Min
Published: November 2012

This paper design an identical polarization embedding high-efficiency permanent magnet synchronous motor and analysis electromagnetic field distribution of the new structure permanent magnet synchronous motor, as well as optimize the design using modern chaos optimization algorithm based on the invention patent. Carried out analysis of energy-saving effect combination high-performance interior PMSM with the aid of identical polarization embedding in textiles with small batch production type test. The optimize design and experiment show that the new structure motor efficiency and power factor higher than the previous configuration of the asynchronous motor, and with high-efficiency and energy-saving advantages in a very broad power output range at the condition of same load.
Design of Parallel Interleaved-Phase-Shift-PWM Inverters with Voltage Feedback Control
Authors: Chen Jyh Wei , Liu Yi Hong , Chen Chi Hou , Yueh Yi Lin , Tzeng Yun Chi , Syu Jian Shiang
Published: November 2012

The paper is to design and implement parallel operation of paralleled inverters with interleaved phase shift. For parallel operation, one inverter is used as master module to transmit synchronization signals to trigger the external interrupts of two microcontrollers for synchronous operation to slave module. In this paper, the design of voltage controlled loop feedback controller by proportional-integral controller is employed to have fast transient response with different load conditions. It is proposed that interleaved phase shift for parallel inverters could reduce output voltage ripple of inverter and increase the system response. The experimental results show that the proposed inverter provided a voltage output with low harmonic distortion by the proposed interleaving phase-shift parallel inverter scheme.
Magnet Design of Liquid Metal Magnetohydrodynamic Generator Driven by Wave
Authors: Xu Yu Yu , Bai Jing , Peng Yan , Zhao Ling Zhi , Li Ran , Liu Bao Lin , Li Jian
Published: November 2012

With the increasing energy requirements, IEE, CAS (Yan Peng’s team) proposes a new wave direct generating power way of liquid metal magnetohydrodynamic (LMMHD). The principle of the new power generating way was introduced and the design and numerical simulation of magnet was described in the paper, which is used to a power generating apparatus of 5 kW.
Electromagnetic Susceptibility Analysis Method of Electro-Explosive Devices
Authors: Qin De Chun , Su Dong Lin , Wu Nan Kai
Published: November 2012

Electro-explosive device (EED) is easily influenced by electromagnetic interference (EMI) in war-field. To study the electromagnetic susceptibility of EED, the method based on full-wave physical modeling and resonance effect simulation is presented. The EMS of non-contact fuse is analyzed as an example. The test data validate the correction of the EMS analysis method, which is of great value for reference to Electromagnetic compatibility (EMC) design of EED.
Characteristic Parameters Research on the Secondary Thermal Ignition of Gasoline-Air Mixture in Cave Depots
Authors: Ou Yi Hong , Qian Hai Bing , Du Yang , Fan Rong , Jiang Xing Sheng
Published: November 2012

The purpose of this paper is to explore difference between the first thermal ignition and the secondary thermal ignition, and to reveal the variation rules of characteristic parameters and critical condition ignition for the secondary thermal ignition of gasoline-air mixture. In this paper, experimental investigation on the gasoline-air mixture secondary ignition induced by hot wall in model underground oil depots tunnel has been carried out. Compared to the first thermal ignition, the ignition intensity of the secondary thermal ignition is greater, while the ignition delay and duration are shorter. After the first thermal ignition extinguish, if the ambient temperature is in the range of 286K to 463K and hot wall’ temperature is in the range of 730 to 783K, then the relation between critical ignition temperature and the ambient temperature can be expressed by cubic polynomial. The critical ignition concentration of gasoline vapor is only 0.45% and that of oxygen is 10.4%.
Analysis and Design of Conditioning Circuitry Used for Energy Scavenging Device
Authors: Cheng Yan , Yu Chun Hui , Huang Jin Xin , Zhang Li
Published: November 2012

Energy scavenging device used for smart grid can achieve energy from electromagnetic field and convert it into electricity to power wireless sensors within substations. Due to the energy collected by the energy scavenging unit is unstable, a conditioning circuitry is essential. A conditioning circuitry is proposed, and modeling method is also established accordingly. Both large-signal model and dynamic disturbance model of the topology are presented as to analyze the static and dynamic characteristics. Remarkably, one duty cycle of the sensors is divided into the launch period and dormant period. At different period, their equivalent impedance is different, so the performance of conditioning circuit at different stages is analyzed. To realize it, a feedback control circuit should be considered in the design of the topology. Further, simulation based on PSIM is done to certify effectiveness of the proposed topology and optimized parameters.
Ion-Electron Interaction Contribution to the Helmholtz Free Energy for Fully Ionized Hydrogen Plasma
Authors: Zheng Xing Rong , Tian Chun Ling , Wu Na , Wu Bo , Wang Xiao Bing
Published: November 2012

The Padé approximation is a very important description of thermodynamic properties of fully ionized hydrogen at high pressures and temperatures. By comparing of several reported Padé approximants via calculation of the ion-electron interaction contribution to the Helmholtz free energy of the fully ionized hydrogen plasma, we find that Padé approximant proposed by Stolzman gives an unphysical odd local minimal appears at low temperature( ), and gradually fade away with the increase of temperature, implying a prominent limit of low temperature. While Chabrier et al. developed a more reasonable Padé approximant for the contribution of ion-electron interaction on the Helmholtz free energy. Analyses on isotherm curves indicate that the thermodynamic properties of the ion-electron interaction contribution to the Helmholtz free energy described by the revised Padé approximant is very stable at all temperatures and pressures without any unphysical effects at low temperatures.
Research on Integrated Optimization for Production Process and Steam Power System
Authors: Sun Yu Mei , Ding Ran , Li Qi Qiang
Published: November 2012

Steam power system and production process are the important parts of the process industry. Steam power system provides the production process steam, electricity and other energy it needs, and the relationship between them is very close. In order to obtain the maximum benefit of the total plant, the integrated optimization of the production process and steam power system is very important. In this paper, the framework of the integrated optimization model is established. An iterative optimization method based on genetic algorithm is proposed to solve the integrated model. Simulation example shows the effectiveness of the proposed method.
Robust Position Tracking for Electro-Hydraulic Drives Based on Generalized Feedforward Compensation Approach
Authors: Schmidt Lasse , Andersen Torben O. , Pedersen Henrik C. , Bech Michael M.
Published: November 2012

This paper presents the development of a robust tracking control concept based on accurate feedforward compensation of hydraulic valve-cylinder drives. The proposed feedforward gain is obtained by use of a generalized description of the valve flow that takes into account any asymmetry of valves and/or cylinders, not assuming these asymmetries to be matched, and utilizes pressure measurements. Hence the proposed compensator is generally applicable to any such drive. Simulations show that the proposed compensator poses superior performance and robustness when subjected to strong perturbations in supply pressure and coulomb friction, compared with a conventional constant gain type feedforward compensator.
The Principle of a Novel Load Sensing Hydraulic System and Design of the Electronic Control System
Authors: Li Yan Jie , Cui Tian Yu , Jiang Ji Hai , Yu Cai Xin
Published: November 2012

Abstract. Based on the load-sensing control principle, a novel type of electronic load sensing hydraulic system was developed. Taking a two-loads system for example, the design and analysis of the novel hydraulic system principle was completed and an electronic control system was accomplished using TTC60 controller. A preliminary experimental study was completed. The experimental studies show that the new system can not only achieve the traditional load-sensing control function, but also improve the level of electronic control system.
2-SMC of Electro-Hydraulic Drives Using the Twisting Algorithm
Authors: Schmidt Lasse , Andersen Torben O. , Pedersen Henrik C. , Bech Michael M.
Published: November 2012

In this paper a controller utilizing second order sliding modes, generally applicable for position tracking control of electro-hydraulic valve-cylinder drives (VCD), is proposed. The proposed controller requires pressure measurements, and only the signs of the valve spool position and piston position- and velocity. The main objective is to introduce a control concept that provide for increased performance compared to linear controllers, in the presence of the inherent nonlinear nature characterizing such systems. To accomplish this task, a controller based on the twisting algorithm and knowledge of system gain variations is proposed. Results demonstrate strong robustness when subjected to parameter perturbations and that control chattering is eliminated.
Dynamic Analysis of 6-DOF Large Displacement Composite Simulation Platform
Authors: Liu Xiang Ming , Yan Hong Yi
Published: November 2012

For the problem of Typical Stewart Platform with small workspace and poor flexibility, the paper proposed a new 6-DOF simulator platform. The simulator platform compounds the three-bar parallel mechanism with moving degrees of freedom and the three-axis turntable with rotating degrees of freedom, it can repeat any attitude of 6-DOF in space. Effectively solve the problem of Typical Stewart Platform with small workspace and poor flexibility. Using Lagrange equation establish dynamic equation of the simulator platform, and using MATLAB in-depth analysis its dynamics. It can provide a reference for the optimal design of structural dynamic of the simulation platform.
Experimental Research on Drilling and Sampling of Lunar Soil Simulant
Authors: Shi X. , Quan Q. , Tang De Wei , Jiang S. , Hou X. , Deng Z.
Published: November 2012

China is conducting a lunar exploration mission named “Chang’e project”. The goal of the exploration mission is to obtain the drilling core without breaking the original geological information. Since the characteristics of drilling object in lunar exploration mission are different from the soil on the earth, efforts should be greatly made on special sampling methods, sampling drills and the appropriate sampling strategies. Herein, we proposed a novel drilling and coring method, in which a soft-bag is mounted in a rotary-percussive drill for lunar soil sampling. In the process of lunar soil drilling, the driving parameters of several moving units are strongly coupled. The moving units should work cooperatively in order to acquire high coring rate and low power consumption. The relationship between the coring quantity and the drilling parameters will be discussed through experiments. The research showed a clear correlation between rotary drilling torque, sample quantity and rev-feed ratio under specific lunar soil conditions.
System Trimming for Improvement of Atomization Device
Authors: Wu Rui , Chen Pei Fu , Lei Cheng Liang
Published: November 2012

By decomposing the problem of serious wear of bearing of the atomization device to treat waste gas yielded in the process of garbage power, TRIZ tool component analysis, system trimming and CAI platform pro/innovator are applied in the paper. Then 2 proposals are put forward, by the advice of experts and the current usable resources, the most suitable one is accepted as the final proposal for the problem.
Simulation of Vision-Based Royal Jelly Collecting Robot
Authors: Wang Zhen , Dun Xiang Ming , Dun Xiang Yong
Published: November 2012

A new method to collect royal jelly is proposed according to the view of industrial robot. A three-dimensional model of royal jelly collecting robot with a monocular camera is built. Detecting the particular shapes via Fourier Descriptors and finding the corresponding target points though the image shot by the camera. The vision-based process and the 3-D simulation are performed alternately to simulate picking up queen bee larvae according to robotic forward kinematics and inverse kinematics.
Analysis for Coupling Relationship of Oil Pocket under Eccentric Load in Hydrostatic Worktable
Authors: Zhao Jian Hua , Gao Dian Rong
Published: November 2012

The oil pocket of the hydrostatic worktable in the modern heavy numerical control (NC) machine tools is designed under the circumstance that the working load acts equally on the oil pockets. But when the work piece is out of the rotary center of the worktable, the working load acts unequally on the oil pockets, and then the performance indexes for the oil pockets, such as acting force, oil film thickness, hydraulic damping, rated flow, are different. Based on the eccentric working load, under the circumstance that the oil pocket provides the fluid oil with constant pressure and constant flow mode, the coupling relationship between the oil pockets is analyzed, and the expression and the relatively bar graphics are presented. To achieve the machining quality and to prevent against the totally worn-out of the machine tools, it is best to adjust one oil pocket in order to keep the oil film of all oil pockets at the same thickness. While one oil pocket is adjusted, the oil pockets are intercoupling, and then the performance indexes change synchronously. According to the characteristics of the oil pocket in the hydrostatic worktable, the expression on the coupling relationship for the oil pocket is derived, then the performance indexes are analyzed qualitatively and the curves are plotted. The proposed research analyzed qualitatively the coupling relationship on the performance indexes for the constant pressure and the constant flow oil pockets separately in the worktable. It can improve the design efficiency and the accuracy with the help of the computer programs, and provides the reference for the practical engineering.
Research on the Control System of the Voice and Motion Synchronism Teaching Group
Authors: Lv Zhong Liang , An Pei Wen , Tang Bao Ping
Published: November 2012

The control system design of voice and motion synchronism teaching group based on computer-controlled is completed. By this control system, 96 motor independent controls and the explanation of the model background can be realized. Furthermore，the purpose of voice and motion synchronism is reached. By software programming, the voice and motion synchronism teaching group can be played in order or played repeatedly.
A Research on Improvement of Vertical Power Centrifugal Spraying Gun with High Speed Based-On ARIZ
Authors: Wu Rui , Chen Pei Fu , Zhao Xin Tong
Published: November 2012

The power centrifugal spraying gun is a key facility to treat waste gas yielded in the process of garbage power. Serious wear of bearing that supports the high speed motor shorten its life greatly. To solve the problem, a new tool ARIZ which is initial letters of algorithm for inventive-problem solving is put forward in the paper. After ARIZ’s analysis, a suggested solution is given for the situation. The process of analysis shows us how to use ARIZ and lays foundations for applying knowledge base and patents with thorough analysis.
The Influence of the Damping Hole Parameters on the Performance of Double Nozzle Flapper Valve Basing on the Orthogonal Test
Authors: Lu Xiang Hui , Gao Dian Rong
Published: November 2012

This paper analyses the flow of the double nozzle flapper valve. Three-dimensional model is established with software Pro/E, fluid analysis software is used for modeling and meshing, CFD method is applied for researching pressure, and flow characteristics of the fixed damping hole is researched when parameters of double nozzle flapper valve is varied. The results show that: the highest velocity through the fixed orifice hole is about 150m/s, the pressure is about 5.9MPa; Using orthogonal test to analyze the simulation results, it is obtained that the power losses of the double nozzle flapper with the change of the diameter, length and the angle of the fixed orifice, the influencing factors on the power losses are the diameter, length and the angle, and the best parameter combination through orthogonal table analysis is gained, which can provide the reference for the whole designing of the double nozzle flapper valve.
Study on Parametric Design of Roller Conveyor Based on Top-Down Assembly Modeling Technology
Authors: Wang Xue Jun , Chi Yi Lin , Li Fu Yu , Gao Li , Xu Ping
Published: November 2012

To improve the quality and precision of the conveying equipment, in addition to strictly control the production craft, more important is to improve the design quality and the design efficiency. In this study, Solid Edge ST4 3 d modeling technology will be proposed to be used in synchronous roller conveyor design. A double chain transmission roller conveyor will be designed. In the process of design, synchronous modeling, parallel design, cooperative modeling technique and Top-down Assembly Modeling technology are combined with during the design. Modular design train of thought is used to consider the overall structure of design scheme. Design of roller conveyor will be divided into different design module to consider, the aim is to promote the standardization of product design. The key point in this paper is focused on the parametric design, top-down assembly modeling technology, synchronous modeling technology [1] in roller conveyor design. Meanwhile exploring roller conveyor and other general transportation equipment design process of standardization implementation is another main work. The results show that the application of the technology can reduce design error and design iterative process, thus greatly improve the design efficiency and engineer the design of the product quality.