bluuebunny/crossref_metadata_2025 huggingface dataset:
Feasibility Assessment of Using Cassava Rhizomes for Firing Pottery in Dan Kwian, Thailand
Authors: Jongpluempiti Jarinee , Tangchaichit Kiatfa
Published: January 2012

Cassava is one of the most important crops in Nakhon Ratchasima province which grows the most cassava in the Northeast of Thailand. Therefore, a large amount of cassava rhizome is left in the field after harvest. The objectives of this research were to study the feasibility of cassava rhizomes use for Dan Kwian pottery firing in the same province. The analysis consisted of physical properties, heating value and comparing firing the pottery by wood fuel and cassava rhizome. The results were that the cassava rhizomes, with moisture content of about 34.73%, had properties inferior to the woods. When the rhizomes are burned to give thermal energy to pottery products, the temperature profile of the rhizomes is similar to the profile of wood fuels. As a result, the typical quantity of rhizome required, burning time and cost are 3,627 kg, 40 hours and 1,814 baht, respectively, while the values for wood are about 2,600 kg, 34 hours and 2,600 baht, respectively. The cost of the rhizome is less than the wood by around 786 baht. Therefore, using cassava rhizome to replace wood fuel is feasible but it is necessary to control the moisture content to an appropriate level.
Research on Friction Disk’s Surface Temperature Distribution and Oil Groove Configuration in Wet Friction Clutch
Authors: Jia Yun Hai
Published: January 2012

Multi-plate wet friction clutch is one of key components of duty truck hydrodynamic-mechanical transmission. Super-heated burn and warping deformation are main invalidation forms of wet friction clutch. It is one of effectual methods to augment friction coefficient and prolong natural life of wet friction clutch that friction disks’ surface temperature and radial temperature are reduced. Compute method of friction disk surface temperature is obtained using theory analysis and confirmed correctness using finite element analysis. It is salience character of wet friction clutch that there are some oil grooves in friction disk surface. These oil grooves can increase friction coefficient and emanate heat quantity. Confirming conformable friction disk’s surface oil groove configuration by experiment research is received. It confirmed that the appropriate surface oil groove configuration of friction disk should be double-arc groove.
A Singlet Oxygen Generator with Rapid Separation Process
Authors: Dai Yu Qiang , Liu Zhen Dong , Xu Xiao Bo , Chen Wen Wu , Zhu Li Zhi , Hu Da Peng
Published: January 2012

Singlet oxygen generator is the heart of chemical oxygen iodine lasers and has been the focus of research for many years. In this paper, a novel singlet oxygen generator with rapid separation technology is briefly put forward. To ensure short residence time, the design of reaction and separation processes happening simultaneously in through-flow reactors is dumpy shaped. By means of computational fluid dynamics, the calculations indicate that the residence time of O2(1Δ) in the new structure is about 15ms and the new SOG has excellent anti-entrainment and defoaming separation performance. The analytical results show the new structure is a feasible and promising technology in singlet oxygen generation cases.
Obtaining and Predicting of Equivalent Load Spectrum for Overhead Traveling Crane Based on Support Vector Machines
Authors: Xu Ge Ning , Li Xiao Peng , Fan Xiao Ning
Published: January 2012

Crane load spectrum is the basis data of the evaluation of fatigue life, obtaining the large samples data need to consume large amount of time and finance. For exploring and initiating a new way of obtaining and predicting the crane load spectrum, the present essay uses Support Vector Machines (SVM) to establish the non-linear mapping relation between this type of crane's work cycles and different rated weights and lifting loads, namely equivalent load spectrum of crane. The Engineering example demonstrates: it is feasible to construct the equivalent load spectrum for some type of crane using SVM. Meanwhile, the equivalent load spectrums of the typical or future crane in this type could be obtained and predicted through the trained SVM model. It has provided the reliable data for the reliability analysis and fatigue life prediction of crane.
Identification of Properties of HVAS Waste-Oil Equipment Coating Based on T_S Fuzzy Model
Authors: Chen Bin , Liu Ge , Zhang Xian Ming
Published: January 2012

As the characteristic of high velocity arc spraying（HVAS）restoration are nonlinear, time-varying and multi-model, it is challenge to identify the model, Takagi-Sugeno (T_S) fuzzy model of abrasion resistance of HVAS coating and technological parameters is proposed. The identification method is presented identifying the consequent parameters with least square method and identifying the input space location and the clustering centre with Fuzzy C-Means Clustering Algorithm. T-S fuzzy model of HVAS tested at the term of examination data, the predictive model and the experiment have the deviation within the-8.6-5.8% limits to abrasion resistance，-8-8% limits to compactness properties.
Material Parameter Determination in Glass Wool Mat for Sound Absorption
Authors: Li Cheng Dong , Chen Zhao Feng , Zhou Jie Ming , Li Bin Bin , Wu Wang Ping , Chen Zhou , Xu Teng Zhou , Qiu Jin Lian
Published: January 2012

Glass wool mat is widely used in the fields of building engineering, transport facilities and refrigeration equipment. In this paper, the effect of material parameters such as density, thickness, porosity, and flow resistivity on the normal incidence absorption coefficient has been studied. In addition, fiber length is also investigated to achieve appropriate strength. The prediction error of normal incidence absorption coefficient by modified Johnson–Allard model is less than 5% in the frequency range between 800 Hz and 5 kHz. We could use the modified Johnson–Allard model to determine the parameter of glass wool mat for better development.
Finite Element Simulation and Experimental Study on Blow Forming of Plastic Cups
Authors: Hu Xiao , Zhang Yi Sheng , Li Hong Qing , Li De Qun
Published: January 2012

Blow forming process of plastic sheets is simple and easy to realize, thus, it is widely used for plastic thin-wall parts. In the practical production, an effective method is needed for the preliminary set-up of process parameters in order to achieve accurate control of thickness distribution. Thus, a finite element method (FEM) code is used to simulate blow forming process. For better description of complex material theological characteristics, a physically based viscoelastic model (VUMAT forms Buckley model) to model the complex constitutive behavior is used. Nonlinear FE analyses using ABAQUS were carried out to simulate the blow forming process of plastic cups. The actual values at different locations show a satisfactory agreement with the simulation results: as a matter of fact the error along the cell mid-section did not exceed 0.02 mm on average, corresponding to 5% of the initial thickness, thus the FE model this paper can meet the requirements of the engineering practice.
GPU Accelerated Parallel Cholesky Factorization
Authors: Wang Liang , Zhang Yi Sheng , Zhu Bin , Xu Chi , Tian Xiao Wei , Wang Chao , Mo Jian Hua , Li Jian
Published: January 2012

One of the fundamental problems in scientific computing is to find solutions for linear equation systems. For finite element problem, Cholesky factorization is often used to solve symmetric positive definite matrices. In this paper, Cholesky factorization is massively parallelized and three different optimization methods - highly parallel factorization, tile strategy and memory scheduling are used to accelerate Cholesky factorization effectively. A novel algorithm using OpenCL is implemented. Testing on GPU shows that performance of the algorithm increases with the dimension of matrix, reaching 785.41GFlops, about 50x times speedup. Cholesky factorization is remarkably improved with OpenCL on GPU.
Research on Virtual Design and Simulation System of Characteristic Fruit Manipulator in Southern China
Authors: Cai Wei Liang , Chen Yan , Zhu Meng Si , Zou Xiang Jun , Li Jing , Xiang He Ping
Published: January 2012

To study the characteristic fruit manipulator in southern China, architecture of fruit manipulator virtual design system was build by the use of modular technology. Parameterize the feature properties of picking manipulator, so the reusable parametric model was build. Based on the database technology, the knowledge base was build, including examples base, constraint rules and research status. Moreover, visualization 3D simulation of the processing of picking was realized under the virtual environment. Finally, through the development of experimental prototype, the virtual design system and its key technologies can be verified.
Research on Sustainable Function Innovation Based on TRIZ
Authors: Cao Guo Zhong , Guo Hai Xia , Zhang Cheng Ye , Li Qing Hai
Published: January 2012

Based on the concept of front-end prevention, the demand evolution, technology evolution, function evolution, effects in TRIZ (Teoriya Resheniya Izobreata-telskikh Zadatch, Theory of Inventive Problems Solving) and sustainable functional innovation are integrated. The key enabling technologies for sustainable function innovation are studied, then innovation process model of for sustainable function innovation are formed. Finally, the CdTe thin film solar cell production line is taken as an example to validate the effectiveness of the above model.
Optimization Design of Controlling Differential Continuously Variable Transmission Based on MATLAB
Authors: Li Zhi Yuan , Zhang Chun , Ji Tao
Published: January 2012

For the current- controlled differential continuously variable transmission design complex, with the whole device for the smallest optimization design goal, the optimum model of the controlling differential stepless speed variator was established. It also introduced a optimization design of the transmission by using the MATLAB optimization toolbox, and the result was that the volume of the equipment was less than the initial value after the optimum design. This study method of effective design for the same type transmission design was provided.
The Study of Permeability Revolution in Coal Reservoir during Methane Production
Authors: Cui Bo , Han Hao Liang , Elsworth Derek
Published: January 2012

Permeability of coal is recognized as the most important parameter for fluid transport through the seams. A new finite element model is applied to quantify the gas flow, the deformation of matrix and the net change of permeability. After plenty of study of the permeability, the revolution of the permeability based on the pore pressure and the sorption-induced strain is built. The sorption which affects the volumetric strain is taken into consideration and the pore pressure is also been studied as a key factor for permeability and other relative parameters.
Studies of Optimum Conditions for Cross-Linking Immobilization of Alkaline Protease on Graphene Oxide
Authors: Su Rui Jing , Zhang Wen Feng , Shi Peng Hui , Zhu Min Cong , Li Deng Xin
Published: January 2012

Graphene oxide was used as substrate for immobilizing alkaline protease. The immobilizing conditions were optimized though single-factor test and orthogonal design. Then the activity recovery was raised to 92.0% and 70.1% in the optimum conditions of immobilization. The test indicated that the optimum technics were as follows: the enzyme amount to 1 mg carriers was 500µl, the concentration glutaraldehyde is 1%, pH was 8.0, temperature was 25°C, crosslinking time and absorption were 4 hours and 1 hour, respectively, the recycling rate of activity (RRA) reached 70.1%.
Modeling and Analysis of C2 Network System
Authors: Song Xiao , Qian Li Dong , Shi Xue Cheng , Zhang Shao Yun
Published: January 2012

A command and control (C2) simulation system, ZZSIM is built. The characteristics of ZZSIM models are discussed, comparing System of Systems, HLA systems and complex systems. It is concluded that HLA based C2 simulation is valid. Then the communication data among C2 simulation nodes are recorded and analyzed, which shows that ZZSIM is scale-free. Therefore the data verify that ZZSIM is a valid simulation system of network centric war.
Numerical Testing for Roof Strength and Rear Wall Strength of High-Top Heavy Truck Cab
Authors: Wang Wei , Xie Xu Liang , Shen Fu Lin , Wang Xiao Feng
Published: January 2012

For design of truck cabin, the survival space must be guaranteed for the safety for driver and front seat passenger in event of crash, which is the legal requirement described in ECE-R29 regulation. In this paper, a finite element model of a high-top cabin for heavy truck was built with commercial code Hypermesh, and a manikin according to ECE-R29 was added to the driver seat. The explicit finite element program Ls-Dyna was used to verify the roof strength and rear wall strength. Analysis and discussion on the deformation of the truck cabin and the survival space of the dummy were presented. The survival space of the cab was proved to be sufficient for the safety of the driver.
Control Model of Laser Cutting Quality Based on Simulated Annealing and Neural Network
Authors: Tong Gui , Xu Hong , Yu Han Qi
Published: January 2012

In processing of laser cutting metal sheet, there is the complex correspondence between crafts parameter and surface quality. This paper proposed a control model of laser cutting quality based on Back-Propagetion(BP) neural networks, which indicated the relationship between craft parameters and surface roughness of laser cutting. By the use of the simulated annealing, the fitting accuracy and convergence of the network would been improved. Experimental design with the Central Composite Design could increase the amount of information and reliability of network trainning samples. After the concrete manufacturing of stainless steel sheet, it was seen from the results the developed method gained better reliability and significance of application.
The Design of Textile Image Processing System
Authors: Fu Qing Qing , Liang Zheng Bin
Published: January 2012

According to the drawback of high cost and complicated circuit and inadequate use of resources in DSP and FPGA structure of textile image processing, an image processing system based on Nios II in FPGA is designed. FPGA is the core of the system.Nios II processor is created in FPGA.Video image is acquired by CCD and processed in FPGA. The result shows that the system has some characteristics of small size, low cost, high integration, high stability and flexibility.
Study on the Artificial Breeding Techniques in Ternstroemia gymnnanthera, an Important Industrial Tanning Plant
Authors: Xu Tao , Wang Yue Hua
Published: January 2012

Ternstroemia gymnnanthera is an important plant for industrial raw material of tanning. The systematic artificial breeding techniques are studied. The seeds and the cutting propagation had been carried out in our lab for two years,There is dormancy period of 3 to 4 months for the mature seeds.we found the dormancy is related to its seed coat and red aril. The seed’s nutrients are stored in the cotyledons. The seed coat artificially broken and GA3 (700mg/L) or NAA (100mg/L) treatment can promote seed germination rate. The seed germination is a good way for seedling nursery. The different treatments had done for cuttings to make the seedling nursery and the treatment with NAA (100mg/L) and ABT can significantly improve the cuttings survival rate of two years.Three wild populations of this species were studied in field. We found it adapted to sun environment better than the half shade or shade environment, as in the shade environment, it can not be normally flowering and bearing fruit.
A De-Noising Method for Non-Stationary Signal
Authors: Shang Yan Hai
Published: January 2012

The paper proposed a de-noising method for non-stationary signals received by a small-size antenna array. By taking into consideration of the correlation of signals received by antennae which compose the antenna array, we could improve greatly the discovery probability of signal coefficients in time-frequency domain through taking advantage of the method of integration for signal detection. Meanwhile, under the assumption of Gaussian noise environment, the probability density functions of noise and signal after integration were also presented. In order to extract the coefficients for signal and reduce the Type I error further, an algorithm based False Discovery Rate (FDR) was put forward. Finally, a comparison between the detection performances before and after integration was made: under same rate of Type I error, the detection performance of signal after integration is improved significantly. And the effectiveness of the method was showed by experimental results as well.
Grey Relational Analysis on the Correlation between the Diameter Variation and Cohesive Times of Raw Silk
Authors: Lu Peng , Chen Ting , Wu Li Li
Published: January 2012

Silk is an superior textile material. The cohesion is an important property of raw silk. The cohesion of raw silk is measured with the Duplan tester and raw silk cohesion automatic tester, respectively. The correlations between the cohesive times given by the Duplan tester and the diameter variations of raw silk after different times of abrasion are analyzed using grey relational analysis. The results shows that the diameter variation between ten-time abrasion and one-time abrasion has the highest correlation with the cohesive times, which shows good application prospects for the raw silk cohesion automatic tester when a ten-time abrasion is adopted.
Research on Concept System of Mechanical Scaling-Rotation Symmetry
Authors: Ma Zhi Yong
Published: January 2012

Scaling-rotation symmetry is combined by rotation symmetry and scaling symmetry, belongs to mechanical static structure symmetry, and widely exists in mechanical systems. Scaling-rotation symmetry plays an important role in realizing the technical, economic and social performances of mechanical products. Based on the concept system of rotation symmetry and the research on large numbers of instances, taking the directivity, the rotary type and the alternations of symmetry components, the types of symmetry benchmark, and the variable type of scaling as standards, the concept system of scaling-rotation symmetry was established. The concept system can provide a theoretical basis for the further research on the application of scaling-rotation symmetry in mechanical systems.
Design of a Web-Based Information Management Platform for Automotive Intake and Exhaust System
Authors: Cheng Yang , Liang Yang , Hong Luo
Published: January 2012

The management and sharing of varied automotive intake and exhaust system data makes it imperative for modern automotive companies. Based on needs of a certain company’s NVH department, much work has been done to analyze the data management method and data features, then a web platform based on B/S model has been built and also the solutions to transformation methods between different data types, data visualization, processing of massive data and data dynamic expansion are presented. Based on the key technologies, a practical web-based information system is designed for the management of intake and exhaust system data, which remarkably facilitates the company’s data management work.
Advanced Iterative Approach to Locating Point Layout for Computer Aided Fixture Design
Authors: Cui Yue , Qin Guo Hua , Ye Hai Chao
Published: January 2012

In the machining process, the parts dimension, geometric shape and the formation of the relative position between the surfaces, depended on the position of the workpiece related to the cutting tool in cutting motion process, while the realization of this mutual position relationship is through locating points layout restricts parts DOFs. For this reason, this paper presents the conceptions of theoretical constrained DOFs and Practical constrained DOFs, at the same time the paper innovatively presents locating points layout determination algorithm for complex parts. Firstly, established the DOFs limit model according to the condition that parts of absolute velocity is zero in the machining precision requirements, theoretical constrained DOFs is expressed as the function relation of machining precision requirements. Secondly, establishing the model of locating points layout according to the constraint condition that parts of normal absolute velocity is zero in the position of locating points, and describing Practical constrained DOFs as the function relation between the position of locating points and normal vector. Then, according to the relationships between theoretical constrained DOFs and solves the model of locating points layout, constructed the automatic design algorithm of locating points layout. Finally, according to the proposed design algorithm, developed design and analysis modules of locating points layout by VC6.0 in the UG environment.
A New Combined Dispatching Rule of One-of-a-Kind Assembly Production Process
Authors: Li Ming , Zhang Ming Yu , Han Jun
Published: January 2012

In this paper, we researched a one-of-a-kind assembly production system where every product is unique (i.e. each product has its unique tree-like process route) and arrives one by one randomly with the exponentially distributed interarrival times. We proposed a new effective combined dispatching rule (ELFT rule) that is constructed by considering three factors: the latest finishing time (LFT), the remaining path size (RPS) and whether an operation is on the critical path (CP). We did many numerical experiments to compare the efficiency between the proposed rule and other rules that were reported in existing studies such as LFT rule and EDD rule. The performance analysis shows that the proposed dispatching rule is more effective in reducing the number of tardy products and total tardiness time.
The Rearch of Finite Element Analysis Method about the Boom of Truck Crane
Authors: Fei Ye , Zhu Tian En , Liu Yan Jun
Published: January 2012

Analyzed defects of the domestic existing finite element analysis methods about boom structure, based on the programmed and automated construct concept of finite element model. Adopted processing way of consolidation to improve the contact problem of slide block and pin shaft, the analytical results was verified through the theoretical calculation, within scope of accuracy requirement, The modeling process of improved model is easy to realized programmed by Ansys of its own APDL language, provided a reliable menthod for modeling automatically of boom’s finite element model of truck crane.
Research of Engine Performance Control Based on EGTM
Authors: Peng Hong Bo , Dan Min
Published: January 2012

Life prediction is one important of Engine research. Take-off EGTM is an important parameter to monitor Engine performance. Take-off EGTM have great influence on Engine life, Reducing EGT will help to extend Engine life on wing (LOW), thereby reducing operating costs. Aiming at Engine condition monitoring, the definition of take-off EGT Margin is given, estimation methods and their application on Engine life prediction are discussed.
A New Method for Constructing Optimal Design of Computer Experiments
Authors: Wu Hong , Wang Wei Ping , Yang Feng
Published: January 2012

Computer experiments are widely used for the design and development of products. Therefore, a new method for constructing optimal experimental design(SOEDM) is developed in this paper. There are two major developments involved in this work. One is on developing a multi- objective optimal criterion by combining correlation and space-filling criteria. The other is on developing an efficient global optimal search algorithm, named as improved enhanced stochastic evolutionary (IESE) algorithm. Several examples are presented to show: the optimal designs are good in terms of both the correlation and distance criteria, the new method can be used in other experimental designs besides Latin hypercube design the number of levels of each factor is equal to the number of the experimental schemes, and the new algorithm is fast.
Study on the Surface Quality of Al2O3 Nano-Films by Ion Beam Sputtering Deposition
Authors: Lin Xiao Ping , Dong Yun , Yang Lian Wei
Published: January 2012

The Al2O3 nano-films of different thicknesses (1~100nm) were successfully deposited on the monocrystalline Si surface by using ion beam sputtering deposition. The surface topography and the component of nano-films with different thickness were analyzed. The quality of the surface of nano-films was systematically studied. When the films’ thickness increase, the studies by atomic force microscope (AFM), X-ray photoelectron spectrum（XPS） show that the gathering grain continually grows up and transits from acerose cellula by two-dimensional growth to globularity by three-dimensional growth. The elements O, Al and Si were found on the surface of Al2O3 nano-films. With the thickness of the films increasing, the content of Al gradually increases and the intensity peak of Si wears off, the surface quality of the deposited films is ceaselessly improved
Experimental Research on Thermal Conductivity of Metal-Oxide Nanofluids
Authors: Shou Qing Yun , Chen Ru Dong , Su Sheng
Published: January 2012

Nanofluid is a kind of new engineering material consisting of nanometer-sized particles dispersed in base fluid. In this study, the thermal conductivity of four kinds of nanofluids is measured by the transient hot-wire method. The thermal conductivity of nanofluids is not only influenced by volume fraction of nanoparticles, but also by other factors such as diameter and suspension stability of nanoparticles and the temperature. The experimental results show that nanofluids have substantially higher thermal conductivity than the same liquids without nanoparticles.
Extraction of Feature Photoacoustic Spectroscopy Probed by a Sensor against a Large Background Noise
Authors: Wu Zhi Ying , Zhang Yi , He Xin
Published: January 2012

An algorithm of independent component analysis from blind source separation domain is used and a Δλ-model strong-noise immunity is proposed in this work. The test results showed that maximal extraction error is respectively 0.28% and 3.7% under a SNR of 1/886 and an excellent agreementbetween the numerical simulation and the actual detection value is found, and the detection limit of test sample is improved from 16 ppb with the model based on common linear equations to 2 ppb using the proposed model.
A New Ultrasonic Honing Device with Ultra-Precision
Authors: Kuai Ji Cai
Published: January 2012

The embedded transducer structure is used to put the transducer into the inside of the honing oil stone bed, which is directly driven by the transducer to vibrate and carry out the ultrasonic honing. Experiments show that honing efficiency of the device lowers by 50%, the roughness of honing surface Ra reaches 60nm - 30nm and the cylindricity comes to 10μm - 1μm, which is much higher than the traditional ultrasonic honing precision. This method solves a range of issues of complex structure, high manufacturing costs, not suitable for ultra-precise honing of the traditional ultrasonic honing head, and it is simple to process and easy to install with low manufacturing costs. Because there is no amplifying of horn, the amplitude is very small, which is especially suitable for ultra-precision honing.
Numerical Study on Flow and Heat Transfer Characteristics of Jet Impingement Cooling
Authors: Sun Run Peng , Zhu Wei Bing , Chen Hong , Chen Chang Jiang
Published: January 2012

Three-dimensional numerical study is conducted to investigate the heat transfer characteristics for the flow impingement cooling in the narrow passage based on cooling technology of turbine blade.The effects of the jet Reynolds number, impingement distance and initial cross-flow on heat transfer characteristic are investigated.Results show that when other parameters remain unchanged local heat transfer coefficient increases with increase of jet Reynolds number；overall heat transfer effect is reduced by initial cross-flow；there is an optimal distance to the best effect of heat transfer.
The Design and Implementation of an Automatic Tracking System of Solar Energy Based on the PID Control Algorithm
Authors: Zhao Zhi Long , Li Zheng Bo , Ma Man Man
Published: January 2012

This text, under the guidance of PID control algorithm, designs and implements a new type of solar water heater which can change orientation of its solar panel in real time to automatically follow the direction where the light is strongest by sensing the incident angle of the sun. Tests show that the new solar water heater can succeed in keeping a real-time trace of light source, which can effectively meliorate the traditional solar water heater's shortcoming of producing insufficient heat in winter in some areas and greatly improve the utilization efficiency of solar energy.
Optimal Scalar Quantization for Motion Tracking via Boolean Compressive Infrared Sampling
Authors: Liu Jun , Liu Min , Guo Xue Mei , Wang Guo Li
Published: January 2012

The recently emerged compressive sensing framework aims to acqure signals at reduced sample rates compared to the classical Shannon-Nyquist rate. This paper is concerned with the optimization problem of motion tracking driven by a sort of passive infrared sampling paradigm which springs from compressive sensing framework. In particular, a structured implementation with binary passive infrared sensor node is proposed to acquire the sparse presence state of human motion with resolution of some small cells. To calibrate the cells, a functional scalar quantizer is employed. Its optimization is used to adjust the design of sampling model to reduce the uncertainty of measurement noise. Simulation results show that the proposed optimization method benefits tracking accuracy to a certain degree.
Integrated Powertrain Control for Gear Shifting
Authors: Wan Guo Qiang , Huang Ying , Zhang Fu Jun , Li Gang
Published: January 2012

Drivability and fuel economy are continuously emphasized during the development of automobiles, and shift quality is the most important part of the drivability. To improve the shift quality, the integrated powertrain control strategy for gear shifting is presented in this paper. First of all, the transmission control strategy based on the turbine speed trajectory is proposed. Furthermore, an output torque observer is determined to implement the coordinated engine control, and then the torque based coordinated engine control is presented. Finally, the integrated powertrain control strategy is studied by experiments. The experimental results show that the integrated powertrain control reduces the shift jerk and the dissipated clutch energy during gear shifting.
Analysis of Two Surfaces in Line Contact under TEHL with Non-Newtonian Lubricants
Authors: Sountaree Rattapasakorn , Mongkol Mongkolwongrojn
Published: January 2012

This paper presents the static characteristics of two surfaces in line contact under TEHL with non-Newtonian lubricant. Modified Reynolds equation, elastic equation and energy equation were formulated to obtain the model. The model was simulated based on numerical method by using Newton-Raphson and multigrid multilevel techniques. The static characteristics of the two surfaces in line contact under TEHL such as film pressure, film thickness and film temperature profiles in the contact region were examined at various loads, speeds, roller radius and elastic modulus respectively. The results showed the significant effect of load, elastic modulus and surface velocity on the TEHL for machine element operated at severe conditions.
Segment Slot Partial Competitive Anti-Collision Algorithm for RFID System
Authors: Yang Zhen Yu , Xing Juan , Wang Xin Gang
Published: January 2012

Slot partial competitive (SPC) anti-collision algorithm is based on the ISO/IEC18000-6C UHF radio frequency identification (RFID) standard, which introduces dynamic binary tree search technology into the competitive collision avoidance mechanism. Moreover, the SPC algorithm applies the specific technologies to idle slots and collision slots. This paper proposes a segment slot partial competitive (SSPC) anti-collision algorithm based on the SPC, and introduce the segment algorithm. The performances of the dynamic binary tree search, the SPC algorithm and the SSPC algorithm are compared via simulation experiments. Simulation results indicate that the SSPC algorithm is improved significantly.
Study on Method of Magnetic Flux Leakage Signals De-Noising for Cracks of Bar
Authors: Sun Hong Chun , Xia Yong Fa , Deng Yue Cheng
Published: January 2012

During bars manufacturing and using process, the use of bars with cracks influenced the service life and sustainable work, on the premise of certain detection system, the choose of signal de-noising method plays an important part in magnetic flux leakage testing process, for which determining the global performance of testing equipment. This paper studies on magnetic flux leakage signals characteristic of cracks on the bar, analyzed the advantages and disadvantages of wavelet analysis and wavelet packet threshold de-noising, and on this basis, in order to give consideration to both the low and high frequency interference signal removing, adopted an integration method that combines wavelet packet threshold de-noising, wavelet packet decomposition and wavelet reconstruction, which greatly improved signal processing results.
Wear Characteristics Analysis of Pin-on-Disc Pairs Based on Finite Element Model
Authors: Zhang Yun Feng , Sun Zhan Jie , Yuan Zhe
Published: January 2012

The stress field distribution and change law of the friction surface are analysed in order to get the mechanism and characteristics of the wear pairs. The theoretical stress model of pin-on-disc pairs are observed according to the model of elastic half-space and the finite element model of it is built using the software of ABAQUS. The boundary condition and load are set and the stress change of the stationary state ,running-in period and stable situation are analysed respectively. The Mises stress ,contact stress and friction in different period are described and compared according to the simulated result of the finite element model.The experiment result shows the same characteristics of the simulation, so the advise is given to improve the frictional performance of the pin-disc pairs.
Constitutive Modelling of Sintering of 316L Stainless Steel Microsize Structures
Authors: Liu Lin , Loh Ngiap Hiang , Tay Bee Yen
Published: January 2012

Constitutive model is useful to predict the final shape of sintered microsize structures. In this paper, the contribution of lattice diffusion (Nabarro-Herring creep) is considered and a constitutive model is established to simulate densification of 316L stainless steel microsize structures fabricated by micro metal injection molding. The predictive capability of the model is verified by comparing the theoretical calculations with the experimental results. The influences of boundary energy on modeling results are discussed. It is found that the modeling results agree reasonably well with the experimental results.
Conjugate Heat Transfer Analysis and Design Optimization of Internally Cooling Turbine Blade
Authors: Qu Mao Hua , Sun Su Ya , Xi Ping
Published: January 2012

To improve the cooling efficiency of turbine blade, a multidisciplinary design optimization (MDO) system involving aerodynamics, heat transfer and structures has been developed. In this system, a MDO procedure for a turbine blade with complicate internal structure is performed. The structural size of rib turbulators, partitions and trailing edge cooling slots, which serve as design variables, is used for parametric modeling of three dimensional turbine blade. Conjugate heat transfer analysis is employed to get the temperature of the blade. The temperature in the blade body obtained from former coupled analysis is specified as boundary conditions for structural analysis. Meanwhile, a combined algorithm of multi-island genetic algorithm (MIGA) and sequential quadratic programming (SQP) is applied for optimization in specified space. While the flow rate of cooling air remains unchanged, the maximum and average temperatures of the blade decrease under the condition of meeting the strength requirement. The result shows that the cooling efficiency of turbine blade is improved, and the system exhibits higher stability, feasibility and efficiency for engineering applications.
Research of Detectivity for Ultrasonic Infrared Thermography NDT in Composite Materials
Authors: Song Yuan Jia , Zhang Wei , Wang Dong Dong , Jin Guo Feng
Published: January 2012

In this paper, the ultrasonic infrared thermography (UIT) technique was applied to detect the composites damage. The frictional heating and thermal conductivity at the location of crack of the composites under ultrasonic excitation was simulated by finite element method (FEM). The excitation parameters including time, amplitude and frequency were studied. The composite involving delamination was detected by the ultrasonic generator. The results show that the UIT can identify the contacting interface-type damages at the surface or subsurface of composites rapidly, for example, delamination, fatigue crack et al.The excitation time, amplitude and frequency are impotent detection parameters. It can be seen accurately and intuitively of location of the damage, and there is no uniform heating problems from the experiment. Suitable coupling material can improve testing quality and eliminate “standing wave” effectively.
Fault Diagnosis of Gearbox Based on Wavelet Transforms and Neural Networks
Authors: Zhang Guang Bin , Ge Yun Jian , Liu Yong Jiu
Published: January 2012

In this paper, an actual system based on wavelet transform and artificial neural networks was established to diagnose different types of fault in a gearbox. As a key step, biorthogonal wavelet was used to denoise in feature extraction of signals because of its properties of compact support, high vanishing moment and symmetry. Consequently, a multi-layer perceptron network were designed to diagnose the fault status with feature vectors as inputs. In order to improve the network learning speed and stability, Levenberg-Marquardt algorithm was used to train the network. The present classification accuracy indicates the effectiveness of gearbox failure diagnosis.
Study on Time-Varying Wires Structure in Wire-Driven Parallel Manipulators
Authors: Yue Sui Lu , Lin Qi , Liu Ru Bing , Wang Zhao , Chen Yi Xin
Published: January 2012

In the paper, the concept of time-varying wires structure is proposed to avoid interference between wires and a mobile platform in a wire-driven parallel suspension system. A mathematical model, a kinematic notation model and a calculation model for interference between wires and the mobile platform have been built for it. When the mobile platform moves at a single degree of freedom pitch rotation, the motion equations of relevant hinge are deduced. The simulation results demonstrate that interference can be avoided in the wire-driven parallel manipulators with time-varying wires structure, and the workspace of the mobile platform may be enlarged. But different motions chosen for the hinge correspond to distinguishable sizes of workspace of the wire-driven parallel manipulators with time-varying wires structure. Therefore, according to the requirements to avoid interference, the motion of the hinge can be designed.
Energy Absorption of an Re-Entrant Honeycombs with Negative Poisson’s Ratio
Authors: Yang Shu , Qi Chang , Guo Dong Ming , Wang Dong
Published: January 2012

In the present paper, we have investigated a negative Poisson’s ratio structure with regular re-entrant cell shape to study its structural response under crush by rigid wall. Firstly, we created the geometry of cellular material in HYPERMESH. The developed geometrical model is imported into LS-DYNA. Then we use commercially available nonlinear explicit finite element code LS-DYNA to simulate the NPR material under uniformly distributed load. The deformation modes and energy absorption characteristics of NPR material were analyzed. Numerical results indicate that this NPR material have good ability of energy absorption.
Design of High-Speed Magnetic Centrifugal Blower Impeller and Numerical Simulation of Internal Flow Field
Authors: Wang Zhao Kui , Liu Shu Qin , Li Hong Wei , Bian Bin
Published: January 2012

Currently, most domestic blower speed is still in 3000r/min level. The friction loss of mechanical bearings results in their low efficiency. To further improve the efficiency of the fan, a new high-speed maglev centrifugal fan was developed specially. The design of impeller styles, structure and size are rational. 3D graphics of the impeller and volute were drawn by using solidworks software. Application of CFD flow analysis software and the SIMPLE algorithm described viscous flow field within the three-dimensional centrifugal fan. By comparing simulation data with calculated data, optimize the turbine design. The simulative results are basically consistent with the design data, which provides a theoretical basis for the design of a new high-speed magnetic levitation fans, improving the level of centrifugal fan design.
Calculation of Leakage Coefficient for Hybrid Magnetic Bearing
Authors: Hou Er Yong , Liu Kun
Published: January 2012

This paper proposes a novel radial hybrid magnetic bearing (RHMB), whose configuration and working principle are introduced, and its mathematical model is built using the equivalent magnetic circuit method. A simple and practical method for calculating leakage coefficients is proposed to improve the accuracy of the equivalent magnetic circuit method. A 3-D finite element model of the RHMB is established by the software ANSYS and the leakage coefficients of control and bias fluxes are calculated, respectively. Based on the obtained leakage coefficients, magnetic forces on the rotor are calculated using the equivalent magnetic circuit method, and the results are compared with those of experiments and the finite element method. It shows that the magnetic forces obtained using the three methods are in agreement with each other, which verifies the correction of the proposed method in the calculation of leakage coefficients.
Reactive Power Optimization in Power Supply System for Industrial Enterprise
Authors: Geng Shu Chao , Zhang Jian Sheng
Published: January 2012

Improving power factor will enhance the efficiency of power-using and the economization on energy. This article analyzes reactive power compensation in several methods, and does a detailed technical comparison. With actual situation of enterprises, some views are put forward for reactive power optimization.
Research of CNC Fault Diagnosis Based on RBF Neural Network
Authors: Zhang Jian Sheng , Zhang Yan Hong
Published: January 2012

The artificial intelligence technology has been widely used in fault diagnosis, but under the unusual circumstances, if the real time data is lacking, it is difficult to build new mathematical model. Now the artificial intelligence technology has been used in the fault diagnosis field. The CNC hinders diagnosis using neural network is introduced in this paper, and the fault diagnosis method of numerical control machine is analyzed, and hence the CNC fault diagnoses are realized by RBF neural network algorithm and program.
A New Distribution and Application in Engineering Reliability
Authors: Li Zhang Miao , Jiao Feng Hua , Kou Xin Jian , Zhang Yan Meng
Published: January 2012

Failure probability of a component is the major project of engineering probability. The reliability of a mechanical system or a structural system is calculated by components in the system. However, statistics data shows that the distribution of test data of components is not according with the distribution by theory as normal distribution. Normal distribution is extensively applied in the component reliability nowadays. Its domain is the field of real numbers, whereas, test data of exper-iments are on a finite field. Consequently, the component reliability used the normal distributions has some limitations. It is necessary to choose a suitable distribution in the calculating method. Comparing the normal distribution density curve and the statistics graph, a new distribution is pre-sented in this paper. The examples by both normal distribution and the new distribution are given, respectively. The results suggest that the new distribution is more accurate than normal distribution in the component reliability.
Direct Torque Control of Bearingless Synchronous Reluctance Motor
Authors: Hu Wei Chao , Li Yan Chao , Yang Ze Bin , Zhu Huang Qiu
Published: January 2012

The bearingless synchronous reluctance motor (BSynRM) is a multi-variable, nonlinear and strong-coupled system. To solve the difficult problem of precise decoupling in electric torque and radial suspension force control, the theory of direct torque control of traditional synchronous reluctance motor are applied to the torque control of a BSynRM in this paper. Based on mathematical models of the BSynRM, A direct torque control algorithm based on space vector pulse width modulation (SVM-DTC) is deduced. The SVM-DTC control system is designed and simulated. The simulation results show the control algorithm of SVM-DTC realizes decoupling in electric torque and radial suspension force control. The static and dynamic performance of electric torque, speed and radial suspension force of the BSynRM is excellent.
Effects of Rotational Inertia and Bearing Force on Stability of Permanent Maglev Rotator
Authors: Qian Kun Xi , Xu Z.H. , Wang H.
Published: January 2012

The authors’ former works demonstrated that a passive magnetic (PM) rotator supported merely by PM bearings has a minimal speed, above which it can stabilize its equilibrium, under the function of a so-called Gyro-effect. It is unclear, however, by which factors is this minimal speed determined. This paper investigated the factors affecting the minimal stable speed of permanent maglev rotator, namely, the rotating inertia and PMB force. Two novel permanent maglev turbine models were designed: Model A---one stator and three rotors which have the same size but different rotational inertias; Model B---one rotor and one stator, but the stator has been devised with three different passive magnetic bearings: 1. a pair of small magnetic rings; 2. a pair of big magnetic rings; and 3. both of the two pairs of magnetic rings. Four Hall sensors distributed evenly at the turbine’s stator were used to detect the rotor’s eccentricity, and the speed sensor measured rotating speed. The calculated models of rotor’s eccentricity were established respectively for the two turbine models; the rotor’s eccentricity measuring system was built up and the rotor’s eccentricity of the two turbines was measured. The experimental data demonstrated that the rotational inertia of three rotors in the model A is 6.293×10-5 kg•m2, 1.074×10-4 kg•m2 and 2.081×10-4 kg•m2 respectively, and the corresponding minimal speed for suspension are 4597rpm, 3030rpm and 2222rpm respectively; in the model B, the magnetic force between the stator and rotor in the three cases is 92.12N, 123.48N, 212.66N respectively, corresponding to the minimal speed for suspension---3730rpm, 3120rpm and 2195rpm respectively. The results exhibited that same as the permanent maglev heart pump, permanent maglev turbines also have gyroscopic effect, which makes the rotors maintain stable suspension. And the minimal speed for suspension has a negative correlation with the rotor’s rotational inertia, namely, the bigger the inertia of the rotor, the smaller the required speed for suspension; the minimal speed for suspension also has a negative correlation with the magnetic force between the stator and rotor, that is, the larger the magnetic force, the smaller the rotating speed for suspension. Smaller minimal speed means better stability of the system, thereafter larger inertia or larger bearing force means better stability; besides, larger difference between minimal speed and performance speed of the rotator means better stability, it’s suggested permanent maglev be applied in high speed rotary machines.