bluuebunny/crossref_metadata_2025 huggingface dataset:
Rolling Bearing Fault Diagnosis and Health Assessment Based on EMD–TEO
Authors: Tang You Ning , Lu Chen , Hu Jia Meng
Published: August 2014

An intelligent rolling bearing fault diagnosis method is proposed using empirical mode decomposition (EMD)–Teager energy operator (TEO) and Mahalanobis distance. EMD can adaptively decompose vibration signals into a series of intrinsic mode functions (IMFs), which are zero mean monocomponent AM–FM signals. TEO can estimate the total mechanical energy required to generate signals. Thus, TEO exhibits good time resolution and self-adaptive ability with regard to the transient components of the signal, which is an advantage in detecting signal impact characteristics. With regard to the impulse feature of the bearing fault vibration signals, TEO can be used to detect the cyclical impulse characteristic caused by bearing failure, gain an instantaneous amplitude spectrum for each IMF component, and then identify the characteristic frequency of a single, interesting IMF component in the bearing fault by means of the Teager energy spectrum. The amplitude of the Teager energy spectrum in the inner race and outer race fault frequencies, as well as the ratio of the energy of the resonance frequency band to the total energy, were extracted as feature vectors, which were then separately used as training samples and test samples for fault diagnosis. Thereafter, the Mahalanobis distances between the real measure and the different overall types of fault samples were calculated to classify the real condition of the rolling bearing. Finally, the Mahalanobis distances were converted into CV values, which assessed the current health state of the rolling bearing. Experimental results prove that this method can accurately identify and diagnose different fault types of rolling bearings.
Simulation and Experiment of Power Amplifier for Magnetic Bearings
Authors: Zhao Zi Jing , Hu Ye Fa , Zhang Liang , Wu Hua Chun
Published: August 2014

Power amplifier is an important part of maglev control system and it may need lots of time and manpower at regulating PI parameters. To solve this problem, an equivalent model was proposed to simplify the parameter adjustment. In this paper, firstly, mathematical model of the power amplifier was proposed and the Simulink model was built in Matlab software. Then the experimental platform was established and dynamic properties of the power amplifier were studied by simulation and experiment. The results show that the overshoot and rise time of experiment and simulation results matches well and the error of cut-off frequency is less than 10%. Therefore, it has instructional significance for parameters design.
A Constructed PQ2 Chart for Calculating the Optimized Process Parameters in Die Casting of Aluminum Alloy
Authors: Dai Wei , Fu Li Bing , Zhang Wei
Published: August 2014

According to the elementary principle of fluid dynamics, the process of die casting formation of the machine line, die line, optimized operating point is discussed in this paper. Use Access to link the data with functions for each part of these, fix them together in a PQ2 chart, form a production window which could be used in all aluminum alloy achieved is illustrated in this paper.
Finite Element Analysis on Ultimate Bearing Capacity of Diagonally Stiffened Steel Plates with Different Span-Depth Ratio
Authors: Yin Yi , Zhang Tao Tao , Li Xiao Dan
Published: August 2014

The ultimate bearing capacity of diagonally stiffened steel plates with different Span-depth ratio were analyzed by the finite element analysis software ANSYS. During the analysis, three groups of diagonally stiffened steel plates with different Span-depth ratio has been taken numerical investigations on static load, and obtained the stress distribution law of development and contrast characteristics of bearing capacity. Analysis shows components' yield and ultimate loads will be significantly improved with the decrease of Span-depth ratio. That means plates with small Span-depth ratio have better mechanical properties.
Standard Technical Research of Shore-to-Ship Power Supply System
Authors: Yang Rui , Zhang Wei , Fan Rong , Gu Qun
Published: August 2014

Based on the analysis of present situation of anchored ship shore-to-ship power supply system, the contents and focus problems of engineering construction industry standard are described. In the shore-to-ship power supply system development process the power consumption load, power supply plan and grounding techniques are analyzed and explained as well.
Facile Synthesis and Luminescence Properties of Gd2O3:Eu3+ Hollow Spheres
Authors: Zhang Cui Miao , Wang Jian Yuan , Liu Ya Min , Jia Guang
Published: August 2014

Well-dispersed, uniform Gd2O3:Eu3+ hollow microspheres have been successfully fabricated via a urea-based homogeneous precipitation method in the presence of colloidal carbon spheres as template, followed by subsequent heat treatment. The main process was carried out under aqueous conditions without any organic solvents, surfactants, or etching agents. The as-obtained Gd2O3:Eu3+ spheres with a spherical shape and hollow structure are uniform in size and distribution, and the diameters of the spheres and thickness of the shell are about 500 nm and 50 nm, respectively. The Gd2O3:Eu3+ hollow spheres exhibit strong red emission corresponding to the 5D0-7F2 transition of the Eu3+ ions under ultraviolet excitation, which might find potential applications in the fields such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
Analysis and Improvement of the BLP Security Model
Authors: Zhao Hai Yan , Wang He Yi , Li Hui
Published: August 2014

Bell-LaPadula model (BLP) model is the most classical multilevel computer security model. Based on the research of BLP model, this paper analyzes the main defects in BLP model and different improving methods, puts forward a principle or “read the nearest and write the nearest”, improves the BLP model more effective security and integrity.
Design of High Performance Fixed Point CORDIC Processor
Authors: Sun Wei , An Jun She
Published: August 2014

To meet the demand for aerospace applications, high-speed computing transcendental functions such as trigonometric functions, we design a high-speed full-parallel CORDIC processor. On this basis,combining the optimized algorithm of simplifing pathway and adding-bits high-precision method , the original design has been improved. The experimental results show that improved design reduces hardware overhead compared to adding-bits high-precision design,and improves accuracy compared to fully parallel design. This high-speed fixed-point CORDIC has high precision and is suitable for high-speed applications in computing trigonometric and inverse trigonometric functions.
Multi-Target Tracking Based on Regional Correlation and Color Histogram Match
Authors: Yu Shou Hua , Chen Ji Hong , Ou Jing Ying , Xu Dan Chun
Published: August 2014

A method based on regional correlation and color histogram match was proposed for multi-target adaptive tracking. Firstly, target detection method was used to get the difference images. Then, the same target could be recognized according to the correlation of target regions of consecutive frames and the matching rate of color histogram. Finally, the active value, lifetime and dormancy value of targets were used to carry out long-time target tracking and deal with the problems of missing detection, false detection and target exit. The experiment shows that the method proposed in this paper has reached to a high accuracy rate of 95%, which has good robustness against the processing of missing detection, false detection and target exit.
Study on Digital Modeling of the Virtual Near-Earth Space for Astronaut Training
Authors: Zhao Zai Qian , Chao Jian Gang , Hu Hong
Published: August 2014

A near-Earth space scene digital modeling was studied for the model simulation, which could be used to show the virtual near-Earth space scene with a high fidelity. Based on the technology of computer graphics processing, detailed analysis was proposed to study the effects of the rendering of geometry models to processing in real-time, the method of spatial movements to objects motion, and the role of spatial illumination to objects brightness, furthermore the simplified, modeling and adjustment methods of each model were demonstrated. The digital model of the HDR near-Earth space scene was established, which laid the theoretical and engineering foundation for the virtual scene simulation.
The Research of Design and Simulation of Four-Wheel Drive Car ASR Controller Model
Authors: Wang Shun Li , Li Lian Sheng
Published: August 2014

ASR (Acceleration Slip Regulation) is the extension based on ABS. ABS and ASR are called by a joint name as slip regulation control system. Compared with two wheel drive car, four-wheel drive car has many defects, which is like snatch operation tedious and other defects. This paper has analyzed drive characteristic of four-wheel drive car and established drive simplify mathematical model. According to the mathematical model, we have established drive simulation model in MATLAB/SIMULINK environment, and made simulated analysis of different road surfaces for the model. The result indicated that slip regulation control system played preferable inhibiting effect for drive wheel spike of four-wheel drive car, and it can obtain a certain improvement of dynamic property. It verified feasibility of control algorithm and validity of control strategy at the same time.
Vehicles Categorization in Complex Background
Authors: Xiang Ying Zhuo , Yang Dong Mei , Yan Ji Kun
Published: August 2014

This paper presents a novel approach to categorize multi-view vehicles in complex background using only two dimension characteristic vectors instead of high dimension vectors. Vehicles have large variability of models and the view-point makes the appearance change dramatically. Significant characteristics should be chosen as the evidence to categorize. In this paper, we categorize the vehicles into two categories – cars and lorries. Line detection method is used and calculating the average line length and the number of parallel lines as the two characteristics. A linear classifier is trained using 30 different view cars and lorries as the training set and an 10 additional different cars and lorries as the testing set.
The Research of Wheel Drive Vehicle Yaw Stability Controller Based on Model Predictive Control
Authors: Zou Chen Guo , Zhou Hong Liang , He Zhen
Published: August 2014

As an important active safety control method, vehicle yaw stability control guarantees the dynamic stability of vehicle. A wheel drive vehicle yaw stability controller based on model predictive control theory is designed to plan the longitudinal forces of the four wheels online to control the driving torque or braking torque of each wheel. With the designed controller, the vehicle is able to track the desired yaw rate in the process of turning. The yaw stability and longitudinal characteristics of the vehicle are guaranteed at the same time.
An Efficient Deadlock Avoidance Policy for FMS Using ROPN
Authors: Zhao Yu Ming , Chai Xiang Ju , Zhao Li Zhen
Published: August 2014

This article shows a composed method for modeling the concurrent execution of working processes in flexible manufacturing systems (FMS) by a special class of Petri nets named Resource Oriented Petri nets (ROPN). Essentially, the type of net comes from the availability of system resources. The analysis of ROPN is used to characterize deadlock situations in terms of full markings for certain structure named PPC. For the sake of preventing the system from deadlocks, a policy is proposed based on a series of restrictions for resource allocation, without considering the presence of unmarked siphons in Process Oriented Petri net (POPN). Finally, a control strategy of deadlock avoidance is designed for ROPN, which is better than other control policy.
Design of the Space-Based Optical Surveillance System Based on the Observation of Pinch Points Region on Earth Geostationary Orbit
Authors: Wu Yu Hao , Wu Jing , Wang Xue Ying
Published: August 2014

In this paper, a space-based optical surveillance system was designed based on the research of geostationary (GEO) objects. Firstly, a strategy to observe the pinch point region was researched. Then, the orbit type of surveillance system and sensor pointing were analyzed, a equation set was deduced to guide the system design. The simulation result demonstrates that the revisit time of the surveillance system designed in this paper is less than one day, and the average coverage time is about 900s per day. The system can observe most of the GEO belt objects.
An Improvement Based on Wavelet Transform Speech Denoising Threshold Function
Authors: Xing Wen Long , Zhang Bo Hu
Published: August 2014

The wavelet threshold denoising method is widely researched and used, the hard threshold and soft threshold which exist different advantages and disadvantages are two kinds commonly used threshold function; the threshold function was improved between hard threshold and soft threshold by using the exponential function. The smooth curve is monotonically increasing, no discontinuity and thus will not produce oscillation. Overcoming shortcomings that the hard threshold function and soft threshold function to be zero in wavelet coefficient is small and soft threshold exist constant deviation, and when the absolute value is greater than the threshold coefficient, soft threshold function is disposed with the same contraction method. After the simulation results prove that compared with traditional speech enhancement algorithms, the new threshold function has been improved to a certain extent.
Driver Fatigue Detection Based on Eye Locating Algorithm
Authors: Wu Wei
Published: August 2014

A method for driver fatigue detection based on eye locating was researched in this paper.. The eye location was achieved by combining gray information with shape information, and matched the eye template of image with which was in the open state. To observe images within a certain time interval was to identify the open or closed state of the drivers' eyes, so as to determine if they have fatigue driving. The results showed that the algorithm could suppress gaussian noise and impulse noise very effectively, and had better filtering performance than the standard median filters..
Iterative ML Symbol Detection without Timing and Phase Synchronization
Authors: Shen Zhi Xiang , Yu Hong Yi , Zhang Xiao Yi , Hu Yun Peng
Published: August 2014

This paper deals with maximum-likelihood (ML) detection of symbol sequence in the absence of synchronization information. A novel iterative scheme is proposed to obtain the ML estimates of the symbols without an estimation of synchronization parameters. Instead of the optimal sampling point recovery and explicit carrier phase compensation, the detection of symbols employs the direct calculation of the matched filter output, eliminating the need for a separate synchronizer. The detection problem is treated as ML estimation from incomplete data, which is solved by means of an iterative scheme based on the expectation-maximization algorithm. The proposed scheme is compared with conventional non-data-aided and iterative ML synchronizers. Accordingly, the simulation results indicate that the proposed detector enables improvements on both the bit error rate and convergence property.
Non-Line-of-Sight Positioning Algorithm Based on Robust Principal Component Analysis
Authors: Xiong Zhu Lin , Liu Ce Lun , Du Wei , Xie Ze Bin
Published: August 2014

Non-Line-of-Sight (NLOS) propagation problems badly degrade the accuracy of wireless mobile positioning algorithms, which incurs a large positive bias in the Time-of-Arrival (TOA) measurements. Under several assumptions, the Hankel matrix of TOA data can be decomposed into a low-rank distance matrix and a sparse error matrix. This paper utilizes the robust principal component analysis (RPCA) method to solve the decomposition problem. After estimating the distance, the positioning problem can use existing Line-of-Sight (LOS) based algorithms to calculate the coordinate of the mobile station (MS). Simulation results show our method outperforms other existing NLOS positioning methods and the RPCA based matrix decomposition process can eliminate NLOS effect efficiently.
Palmprint Recognition Based on Sparse Two-Dimensional Local Discriminant Projections
Authors: Zhang Jian Xin , Zhang Zhang E , Liu Jian Yang
Published: August 2014

A novel palmprint recognition method based on sparse two-dimensional local discriminant projections (S2DLDP) is proposed. After a description of the basic theory and resolution method for S2DLDP, the paper presents the detail palmprint feature extraction method based on S2DLDP, and tests the algorithm performance by various non-zero elements size and neighborhood size. S2DLDP considerers the class information, local separability, two-dimensional image inherent properties of training samples and sparse projection, which provides an intuitive, semantic and interpretable feature subspace for palmprint representation. The optimal recognition accuracy of EER=2.2% is obtained on PolyU palmprint database, which also illuminates the effectiveness of the proposed algorithm.
The Optimization of Adaptive PID Control Algorithm Based on RBF Neural Network
Authors: Liu Jing , Wang Guo Xin
Published: August 2014

As the earliest practical controller, PID controller has more than 50 years of history, and it is still the most widely used and most common industrial controllers. PID controller is simple to understand and use, without a prerequisite for an accurate model of the physical system, thus become the most popular, the most common controller. The reason why PID controller is the first developed one is that its simple algorithm, robustness and high reliability. It is widely used in process control and motion control, especially for accurate mathematical model that can be established deterministic control system. But the conventional PID controller tuning parameters are often poor performance, poor adaptability to the operating environment. The neural network has a strong nonlinear mapping ability, competence, self-learning ability of associative memory, and has a viable quantities of information processing methods and good fault tolerance.
Research on Modulation Recognition of the MPSK Signals Based on Statistical Analysis
Authors: Wang Zheng , Wang Bing He , Qu Yi
Published: August 2014

The PSK signals have been applied widely in wireless communication systems, such as in the military and commercial satellite system, the digital short-wave radios, and the ALE system of radio station, etc. This article will be discussed on the problem of how to identify the PSK subclass signal in the situation of non-cooperative communication. In addition, the blind identification method based on Wavelet Transform (WT) and Phase Clustering has been mentioned in the following without knowing any prior information. The first is to obtain the phase mutation phase difference by using WT, and then the modulation recognition of PSK subclass signal will be achieved through the threshold that ground on characteristics of PSK structure. When SNR greater than 2dB, the recognition rate of PSK subclass signal can reach more than 93%, in the condition of white Gaussian noise.
The Local Fractional Hilbert Transform Based on Fractal Theory
Authors: Wang Yan Hai
Published: August 2014

In this paper, the local fractional Hilbert transform in fractal space is established. The characteristics of this local fractional transform are discussed in the following. Considering the basic properties of the local fractional Hilbert transforms, a kind of transform for local fractional is derived and analyzed.
Design and Simulation Analysis of Low Temperature Air Deep Hole Processing System
Authors: Peng Hai , Wang Qiang
Published: August 2014

In this paper, a unique design of low temperature of BTA deep-hole machining system based on the green manufacturing was proposed,in which the low temperature air cutting technology was applied to the BTA deep hole processing. Consequently, the system have the characteristics of low temperature air cutting and deep hole processing. The system presented here uses the large flow of cold air (-30 °C ~-20 °C) and oil mixing atomization gas (MQL) for chip removal, cooling and lubricating the tool, thus the use of deep hole cutting oil was decreased, the cooling and lubricating effect of the tool was strengthened and the tool life was also strengthened. In this article, the ANSYS CFX was used for simulating the internal flow field of chip removal channel. By means of simulations, it is concluded that the pressure difference between the low temperature cold wind is significantly greater than the pressure difference between the liquid, and the gas flow rate is greater than the liquid flow rate. The comprehensive analysis indicate that low temperature air system are likely to bring about a better ability of chip removal, which provides theoretical basis for the low temperature air cutting technology was applied to deep-hole machining system.
Molten Depth Modeling of Laser Transmission Welding Based on Temperature Distribution of Moving Point Heat Source
Authors: Yan Zhang , Lin You Yu , Liu Hui Xia , Li Pin , Cai Ye
Published: August 2014

Laser transmission welding (LTW) is a new and efficient technology. During LTW of polymers, the size and morphology of the weld have great influence on the welding quality. In order to better evaluate the welding quality and optimize process parameters, many researches on the morphology and mathematical analytical model of the molten pool have been conducted. This study attempts to build an analytical model for calculating the depth of the molten pool (molten depth), based on the temperature field distribution theory of the moving point heat source acting on the semi-infinite body. The influence of the welding power and welding speed on the molten depth is studied emphatically. The mathematical analytical model is solved through MATLAB mathematical software. Subsequently, the test experiment about LTW of PA66 is conducted to validate the model. During the test experiment, the upper layer contains 30 wt. % glass fibers (GF) and the bottom layer contains 30 wt. % carbon fiber (CF). The result shows that the mathematical analytical model can well predict the trend of the molten depth. However, the error exists indeed. The detailed analysis about the error is also made in this article.
Research on Elastic Damping Control Strategy at High Speed for a Vehicle Electronic Power Steering System Stability
Authors: Ma Xin Lei , Guo Yong Feng , Shi Ping , Guo Yue
Published: August 2014

Electronic power steering (EPS) system is a critical component for vehicle safety driving. The damping force of automobile steering is decreased at high speeds, so the driving feel is floating. When vehicle suspension shock and a front wheel sensitive to road counterforce it is relation with the driver safety. For the subject of vehicle stability at high speed, an EPS system control strategy of stability has been presented. In order to keep driving feel, when the steering resistance decrease an elastic damping will be increased. Current follow control technique is introduced, and the torque sensor can estimate the vehicle state. This method can be verified by the experiment.
Comparison of Several Common Types of Grease Performance Based AR 2000ex Remoter
Authors: He Chun Xia , Wu Su Zheng , Yang Hang Song , Liu Jian Xiu
Published: August 2014

Different substrates grease composition due to differences in their varying degrees of change in viscosity after shearing studied the rheological properties of three different substrates grease. Used AR2000ex rheometer, investigated the effects of different sessions on the rheological properties of the grease. It was found that the stability of lithium grease from the grease either stops working, or their work situation by cutting lubrication properties, are superior to calcium-based grease and urea-based grease. Urea-based grease on the shear sensitivity is smaller relatively than lithium and the recovery of viscosity after being subjected to continuous shear weak, easily lost during use based the grease flow curves with Herschel-Bulkley model, and the impact performance of the grease thixotropic grease is yield stress.
Chaotic Particle Swarm Optimization for Automatic Surface or Curve Localization
Authors: Wu Jia Feng , Qin Dong Li
Published: August 2014

In order to solve the automatic localization problem of the surface or curve detection, this paper presents a method for obtaining a global optimal solution, the method uses particle swarm algorithm to solve the position and orientation. To solve the problem of premature convergence and slow convergence in particle swarm algorithm, a chaotic mapping logistic model is presented to improve the performance of particle swarm algorithm and the shrinking chaotic mutation operator is applied into the method to increase the diversity and ergodicity of particle populations. In this paper, the objective matrix is separately described by quaternion and Euler angles, and the accuracy and convergence of the algorithm are analyzed taken into account these matrices. Simulation results demonstrate that two mentioned expressions can comply with the requirements of adaptive localization, and while Euler angles as optimization variables, chaotic particle swarm optimization have higher accuracy results. Finally, compared to Hong-Tan algorithms, the method is effective and reliable.
Design of Body Structure for New Type Lightweight Electric Vehicle
Authors: Wang Li Xia , Zhao Tian Feng , Cao Jian Bo , Shen Ji Feng , Xiao Yan Bin , Zhou Ze Xin
Published: August 2014

Considering the efficient use of energy and environmental pollution, people's lives tend to energy saving and environmental protection, and energy saving electric vehicles has gradually been widely used. Through combining theoretical analysis, numerical simulation, system design and experimental validation, based on studying electric vehicle body design principles, the experiment optimized electric vehicle body design, and reduced the weight of the vehicle effectively. Its performance becomes more advanced, and the application becomes more economical and safe. By using Solidworks software, lightweight electric vehicle body structure of two-dimensional design and three-dimensional modeling was built to reach practical requirements. The body structure design is original and simple, which has good practical value.
Research on MRF Shear Stress Measurement Method under Non-Uniform Magnetic
Authors: Ren Shao Qing , Gao Chun Fu , Huang Peng , He Xin Sheng , Wang Hong Yun , Chen Wei Zeng
Published: August 2014

Magnetorheological fluid as an important branch of the emerging intelligent material, its excellent characteristics make it widely used in electrical system and mechanical system. Common MRF system environment is limited to a uniform magnetic field, the practical application process to the vast of magneto rheological characteristics devices has shown the phenomenon, which does not match the uniform magnetic field theory, the reason is that the actual work environment is the non-uniform magnetic [1-2]. To study the characteristics of MRF shear stress in a non-uniform magnetic field, this paper established a non-uniform field magneto-rheological fluid shear stress measurement device. Comparing the experimental shear stress curves with the uniform magnetic field measured shear stress curves, we found that the non-uniform magnetic field strength of the environmental equivalent shear stress values ​​compared with the uniform magnetic field data have large deviation, this indicates that the existing uniform magnetic field theory is not well to explain non-uniform magnetic field shear properties of MRF, we need to build the introduction of non-uniform magnetic field theory.
Diamond-Bead Wire Classification and Spectrum with POS Part II: Classification with Structure and Spectrum with POS
Authors: Gu Li Zhi , Wei Sheng Jun
Published: August 2014

This is companion paper with “Diamond-bead Wire Classification and Spectrum with POS Part I: Classification with Process and Subject”. The current study continued to collected and analyzed systematically a series of patterns of diamond-bead wires from the diamond-bead wire manufacturers throughout the globe and went insight into the essential elements of the wire, including the overall layout, shape characteristics, technological processes, cutting and grinding object, and studied in classification for the spectrum characteristics, with respect to the features of structure, process and the sawing object. The stress was on the method of classification with POS with respect to the structural characteristics, and a trial spectrum has been drawn on the POS classification for diamond–bead wires. Such subject was discussed and presented in two parts, and here is the second part for classification with structure and spectrum with POS.
Design and Experiment of Hand-Push Vibration Picking Machine of Lowbush Blueberry
Authors: Bao Yu Dong , Guo Yan Ling
Published: August 2014

As plants of lowbush blueberry are widely cultivated, picking of blueberry has become an important link in the chain of blueberry industry. At present, research of domestic machinery of blueberry picking is still in early stages. Mechanical and automation level of blueberry picking are enriched, through research of picking machine of lowbush blueberry. The research has the vital significance to the development of blueberry industry. To improve picking efficiency and reduce total loss rate of green fruit, mechanism of picking is analyzed. Fruit, which has certain representativeness in the variety, is researched. Picking force and vibration frequency of plants are obtained and work principle is determined. Structures of vibrating picking and fruit collection and the body of the machine are designed. Parameters of structure size and working are determined, with which the machine is manufactured. Plan of experiment is designed and experiment of picking is done in the season blueberries are most ripe. Result indicates structure of blueberry picking machine is reasonable. Picking force and vibration frequency are effective. Compared with that of manual picking, efficiency of mechanical picking is high, which meets technical requirements of blueberry machinery.
Numerical Research on High-Strength Rectangular Section Steel Tube in Rotary-Draw Bending
Authors: Xing Zhong Wen , Xu Zhi Wei , Yang Hong Liang , Lei Cheng Xi
Published: August 2014

A finite element model of high-strength rectangular section steel tube in rotary-draw bending is established to study the stress and strain in the bending process. Based on control variate method, this paper analyzes the influence laws of three geometric parameters on rotary-draw bending. The results show that bending radius is the most important factor, forming property increases significantly with the increase of bending radius, the trends of cracking and wrinkling are all decreased. The thickness of wall has influence on the strain of inwall, thinner tube may cause crack and wrinkle. Fillet radius has no effect on ektexine, the strain of inwall decreases slightly with the increase of fillet radius.
A sEMG Recording System
Authors: Gao Yong Sheng , Bai Jie , Wang Sheng Xin , Zhao Jie , Li Xiao Yan
Published: August 2014

The sEMG (surface electromyographic) plays a significant role in the rehabilitation medicine, particularly in exoskeleton robotic treatment. A sEMG recording system using STM32F407 DISCOVERY development board and Labview software, combined with multiple signal acquisition sensors was proposed in this paper. The UC/OS-II operating system was embedded in the STM32F407 micro controller so that multiple channels can be picked up from different sensors at the same time. Due to the characteristics of STM32F407 microcontroller; the largest acquisition channels can be up to 16, and multiple signals can be collected such as the sEMG, angle trajectory, acceleration, torque etc. The use of DISCOVERY development board and Labview has reduced development cycle to a greater extent and resulted large improvement in work efficiency.
Design of New-Style Book Trolley Based on Electric Drive for Library
Authors: Liu Zhi , Zhao Tian Feng , Cao Jian Bo , Jin Li Li , Chen Jia Jun , Tang Jia Wei
Published: August 2014

The book transporter innovation to improve the efficiency of the modern library book classification is an important aspect. In this essay, Based on the research on the electric control system, a DC motor as a metal belt stepless automatic transmission was adopt to greatly reduce the number of parts the system and improve overall efficiency, response speed and control precision ratio, thus library books for transportation vehicles designed control system, enabling the driver, speed and other functions. Software such as the Solidworks was applied for designing body shape, includes a handle, a frame, wheels, support frame, a 'W'-shaped support frame was proposed, it can be installed to increase the capacity of the trolley, a pedal was added at the bottom of the trolley, the user can stand on it to save effort. The electric trolley placed the book has simple structure, easy to use, saving manpower, high efficiency, and has good practical value.
Cross Language Query Expansion Approach for CIMS Based on Weighted D-S Evidence Theory
Authors: Wang Xiao Bo , Zhao Fan , Li Xiao , Zhang Rong Hui
Published: August 2014

With the Computer Integrated Manufacturing System and Information Technology rapid development, rapid retrieval multilingual becomes one of the hot spots in Machine Translation. The cross-language information retrieval (CLIR) provides a convenient way, enabling users to use their own familiar language to submit queries to retrieve documents in another language. Basic query expansion is one of the effective methods to improve recall of information retrieval. There are many researchers have proposed many extension methods, but most methods are simply added to the query expansion terms. If we do not distinguish the original query words and extended words, expanded query may deviate from the original semantics. So, it is very inconvenience for mechanical engineer and programmer. Based on Dempster-Shafer theory of evidence, we proposed a query expansion computing model, which considered as the main evidence of the original query terms, while the extensions as a secondary evidence of the original query terms. Which method to use semantic dictionary Han and Uygur-Chinese bilingual dictionary of synonyms forest and How to get the query word synonyms, near-synonyms and hypernym. Latent Semantic Analysis is used to obtain semantic relationships query words related words the using potentially large-scale text. The combination of these two types of evidence is in order to put forward a weighted combination of the Dempster-Shafer rule. Experimental results show that this method can effectively improve retrieval efficiency in Mechanical Engineering and Information Technology. The research results can be provided a reference for CIMS multilingual quick retrieval.
Precision Measurement and Error Evaluation of Connecting Rod Standard Gauge Block Based on CMM
Authors: Pan Wei Min , Kong Ning Ning , Ye Xin
Published: August 2014

Connecting rod is often in high speed movement as one of the main parts of automobile engine. It’s shape error and accuracy of the hole or the plane will directly influence the working performance and the service life of engine. So the production has very strict requirements on the shape error. Connecting rod standard gauge block, as a standard part of manufacturing connecting rod, it’s manufacturing accuracy is higher, and the measurement and calibration of error directly affects the machining efficiency and the precision of the connecting rod. CMM develops so fast that constantly pounding all kinds of special measuring equipment. In the contact, a digital measurement is carried out for the key dimension and the space shape error of connecting rod standard gauge block. so data processing of the measuring results has been obtained, then reconstructed geometry elements of the plane and round hole ,etc., and got the required shape error by the contact CMM, it provides the basis for improving machining precision of the connecting rod.
Determination Method of Optimal Preventive Maintenance Measure of Based on Decision Matrix Principle
Authors: Qiu Xin , Yang Qing , Xiao Shang Lin
Published: August 2014

With the increasing of the large-size and overload of highway transport vehicles, the riding quality and the service life of pavement engineering are facing with a rigorous challenge. According to maintenance experiences from various countries in the world, adopting a reliable pavement preventive maintenance (PPM) measure is an effective method to keep the pavement with a good service level with the less expenditure of capital. The selection plan of the optimal measure is one of the critical aspects of the PPM technology. Whether a PPM measure is suitable or not is closely related to the PPM technical features, the pavement conditions and the traffic service levels. The purpose of the paper was to put forward the principle, method and procedure of the optimal PPM measure selection in terms of the specific features of asphalt pavements based on the decision matrix analysis and the equivalent annual cost method. The analysis results of a project level case demonstrates that the micro surfacing technology is the most suitable PPM measure to match the practical pavement conditions of the Puxing Road.
Diagnosis and Recognition of Pavement Structural Defects Based on Acoustic Emission Principle
Authors: Shen Gang , Hu Yong Ju , He Ren Feng , Qiu Xin
Published: August 2014

Through extensive literature research, this paper from the principle of acoustic emission technology, development and application of acoustic emission technology at home and abroad, the characteristics of acoustic emission technology, acoustic emission instrument classification, structure and technical indicators of acoustic emission technique is applied to the aspects of pavement structure defect diagnosis about the prospect of the system in this paper. Introducing the SAEU2S acoustic emission system structure and technical indicators of acoustic emission instrument applied in pavement structure for the future defect diagnosis recognition provides the reference. Research results objectively show the non-destructive testing technology for pavement maintenance performance detection technology advantage, basic principle and method of then for pavement dynamic maintenance tracking and evaluation of real-time traffic all the way, maintenance decision information and the realization of the institutionalization of laid a foundation.
Finite Element Simulation Application for Vibration Characteristic of Violin
Authors: Zhang Cheng Zhong , Ye Bang Yan , Hu Xi Zhi , Zhao Xue Zhi , Cao Yun Feng
Published: August 2014

In this paper, Finite Element Technology is applied to study the vibration state of violin sounding box using numerical simulation. By means of geometric modeling for the complicated shape of violin sounding box and Finite Element Analysis, the structural parameters of violin box, including thickness of violin plate, height and distribution and change of the shape of arch in front plate geometry, status of bass bar and sound-post etc, are investigated for their influence on vibration patterns and frequency response of violin box. Experiment is carried out for measuring the frequencies responses of violin box to verify the results of the Finite Element Analysis. This research provides a feasible way of theories for violin makers to improve the vibration characteristics of violin.
Identification Control Based on the 2.4 GHz Active Technology
Authors: Hong Yang
Published: August 2014

With the rapid development of information and advanced manufacturing technology, the number of vehicles made by manufacturing enterprises suppliers has substantial increase, and the vehicle management issues become increasingly prominent .Now, since a lot of vehicles factory is lack of effective management practices, slow plant vehicle turnover, uneven loading and unloading area of the factory, and the crowded confusion of factory logistics is more and more serious. In order to improve the management level, to strengthen the efficiency of loading and unloading the vehicle supplier and the protection of the safety of a vehicle plant in the region, the subject will design a vehicle management system with a higher degree of automation. Vehicle identification control system is designed to establish the plant area and unloading vehicle management system management system, building intensive management. These include some of the following features: Vehicle intelligent, automated management of the system is the main objective. This includes the following specific functions: vendor vehicles and staff vehicles holding the legal RF card can pass; others no relevant RF card issued by the administrator cannot access, unless having obtaining a temporary card from the administrators. System must be able to record the time of entering and leaving the factory; according to the state of unloading points, system allocates the unloading point for vehicle distribution, and provide guidance automatically; vehicle access information can be queried at any time.
Research of Blades of Complex Surface Construction Based on Laser Rapid Prototyping
Authors: Yang Zhi Bo , Qu Zhen Peng
Published: August 2014

There are a lot of faults in making complex surface parts (especially 3D curved blade) as designing difficultly, processing complexly, low production efficiency and so on. In this paper, it integrates the computer aided design and manufacturing, layered manufacturing and increase material molding technology. They are based on the pro/E 3d surface modeling and rapid prototype technology. The technology can put the blades of irregular surface processing into simple graphic processing. We can make complex plane quickly, make the development cycle of new products shorter and reduce the development cost by selected material curing. Thus it can make the enterprise have higher product development capacity and market competitiveness.
Research on the Hot Stamping of Invar Based on Flexible Mould
Authors: Huang Jia Shuai , Wang Guang Lin , Shao Dong Xiang , Wang Hao Yang
Published: August 2014

This paper introduces the defect formation and compensation method of Invar during hot stamping with multi point flexible mould. In cylindrical and spherical, for example, through Solidworks 3-d modeling, using Dynaform to do forming numerical simulation, we study multi point hot stamping defects of thick Invar, mainly including indentation and rebound. Then we get the rules of indentation and rebound with thickness and curvature, compensate these defects and control the error within the requirements.
Acoustic Emission Signal Acquisition and Analysis on Tool Wear
Authors: Huang Hui Yu , Hong Yang
Published: August 2014

In the field of machinery manufacture, broken state at the time of the cutting tool in cutting metal, recognition has always been a study is of great significance. Currently, for the state of tool wear and collapse edge damage identification method already has a mature experience. However the existing condition monitoring methods are often used in accuracy and convenience has limitations, this paper USES the acoustic emission technology, as a kind of integrated online test sys tem design lay the foundation. This paper aimed at the sensor in the wireless transmission module, the performance characteristics of tool condition monitoring system of the main structure was designed, and then by acoustic emission signal from the cutting tool in cutting process as the research object, studies the cutting tool characteristics of acoustic emission signal under different damage state, for the on-line monitoring system design and calibration to provide theoretical support.
Analysis of Bearing Mechanics Characteristic of Wind Turbine
Authors: Xu Lan Ying , Mao Yong , Wu Qiang
Published: August 2014

The transmission gear, bearing and hub and important component of wind field prone to fatigue failure under thermal load and alternating stress. The core component of MW class wind turbine gear box is bearing parts, according to the Betz principle bearing dynamic characteristic is analyzed including deduction and calculation of axial force and radial force, this paper simulates contact stress under the typical conditions of cylindrical roller bearing by finite element method, meanwhile analyzes the stress variation of the rolling body and a holding frame, the simulation results show that bearings bear a greater impact load in the starting process, retainer and rolling body produce large instantaneous stress value in the process, while the stress value is relatively small in the smooth operation and at braking speed, The simulation results has some practical value in engineering of optimization design.
Experimental Study on Laser Impact Welding of Dissimilar Metals
Authors: Gu Yu Xuan , Wang Xiao , Hao Er Shu , Zheng Yuan Yuan , Qiu Tang Biao , Ma You Juan , Liu Hui Xia
Published: August 2014

Laser impact welding (LIW) is a novel welding technique which uses laser induced shock waves to obtain the solid-state and metallurgical bonding between flyer and base plates, and can be applied in welding of dissimilar metal plates in micron level. In this paper, experimental study is conducted with titanium as the flyer plate and aluminum as the base plate under different laser energies and laser spot diameters. Besides, the microstructure and mechanical properties of the welding joints are also investigated. The wavy interface is observed by metallographic investigation which is similar to explosive welding and electromagnetic pulse welding. Moreover, the micro-hardness taken from the interface region shows an obvious improvement compared with the base metal. It is also found that laser shock welding results in fine grained structure of titanium on the weld interface. In conclusion, laser shock welding can not only improve the material microstructure of weld interface, but also avoid the heat affected zone and formation of intermetallic phase during dissimilar metal welding. Therefore, it is a promising welding technology in the field of MEMS.
Torsional Vibration of Precise Cable Drive System
Authors: Lu Ya Fei , Fan Da Peng , Chen Qing Yang , Xie Xin
Published: August 2014

Precise cable drive has been developed as an alternative transmission element to gearbox, belt and pulleys, chains and sprocket in Electro-Optical Tracking system. Precise cable drive has several significant advantages including backlash free, high stiffness, high efficiency, no lubrication etc.. This paper develops analytical methods to predict the Torsional Vibration of precise cable drive to enable designers to better assess dynamic performance in the design study phase. Theoretical formulation of transmission stiffness for precise cable drive is carried out, the dynamic equation of cable drive system is deduced and inherent frequency is obtained. Parametric studies are conducted to evaluate the relationship between the inherent frequency and cable drive parameters.
Mechanical Design and Simulation Analysis of Finned Tube Winding Machine for Assembly
Authors: Wang Ya Ping , Li Ge , Gao Lei , Liu Dong Yao , Shi Chang Xuan , Yuan Wen Yue
Published: August 2014

With the increasing of market demand for finned tube and fin tube processing equipment in China continued to deepen, the problems of the inefficient study design a new type of finned tube winding machine in order to solve the traditional winding machine problem such as low efficiency and the unstable quality. Using a design method for assembly , complete design parameters to calculate the main structure of the feeding and winding device and implementing the device on three dimensional Assembly based on CATIA modeling process. Finally, to verify the overall structural design rationality, we have created a virtual prototype of finned tubes and motion simulation and the collision detection also be done.