bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation Technology of the Steel Reinforced Concrete Special-Shaped Columns Using Ansys
Authors: Hou Wei , Zhou Xue Feng , Chen Xiang
Published: February 2012

Nonlinear finite element analysis of twelve SRC (steel reinforced concrete) special-shaped columns using ANSYS programs was conducted and the mechanical behaviors of these columns were analyzed. A series of numerical simulation technologies such as defining the material model of the concrete /steel, establishing global finite element model with discrete reinforced bars/stirrups elements and the methods of post-processing of the results were investigated. A quick method of finite element model establishment was proposed to avoid unit not sharing nodes and grid division error during meshing, which would cause problems such as divergence of the model. The results indicate that the numerical simulation technology presented is feasible and can be applied to further research on mechanical behaviors of the SRC structures.
Research on Fault Diagnosis of Weapon Equipment Based on Support Vector Machines
Authors: Zhang Lin , Liu Tao , Zhang An Tang , Xu Peng , Lian Ke
Published: February 2012

Surface-to-air missile equipment is an advanced aerial defense weapon equipment of middle-high altitude intermediate range in our army, and this weapon equipment is also shouldering the significant task of antiaircraft defense of our country. Therefore, researching on its Fault Intelligent Diagnosis System has an important practical significance and military value on improving the weapon equipment’s renewing of fault and keeping the army’s battle effectiveness.
Speed Control Scheme for BLDC Drive with Nonlinear Fuzzy PID Control Based on DSP and FPGA
Authors: Lv Fu Xing , Gao Ying
Published: February 2012

Because of its high performance, brushless DC motors are widely used in vehicles. But the brushless DC motor speed system itself is easily influenced by the parameter variation, the cogging torque and the load disturbance. And some complex algorithms to overcome the deficiency are difficult to implement on a single DSP chip. To solve the problem, the paper represents a nonlinear PID controller based on DSP and FPGA. A functional design of FPGA in a brushless DC motor system based on FPGA and DSP was completed by using modular design method. All the function modules are programmed by Very-High-Speed Integrated Circuit Hardware Description Language (VHDL). The simulation and experiment results indicate that nonlinear PID can improve the performances of the servo system in rapidity, control accuracy, adaptability and robustness.
Intelligent Car Direction Control Based on Fuzzy PID
Authors: Liang Guo , Gao Hong Li , Zhang Xiao Cheng
Published: February 2012

Direction control is the decisive factors in intelligent car race. This paper used OV7620-CMOS as sensor, with steering gear as direction ac-tuators. Put forward intelligent car direction control model based on fuzzy PID algorithm. Experimental results show that fuzzy PID control algorithm is to improve the operation of the intelligent vehicle direction control response speed and the accuracy is very effective.
Study of Collagen Assemble into Gel In Situ Used as Tissue Engineering Scaffold
Authors: Cui Yuan , Li Yan Hui , Duan Qian
Published: February 2012

Collagen is a kind of protein which can self-assemble into collagen gel in vitro at 37°C in neutral pH. In this work, collagen is extracted from bovine tendon and characterized by amino acid analysis and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). When pH of collagen solution is adjusted to 6.6~6.8 and incubated at 37°C for an hour, collagen molecular can be assembling into gel. As a result, collagen fibers in gel observed form electron microscopic (SEM and TEM) look like natural collagen fiber with cross-grain, which is caused by collage molecular assembly behavior. Then mouse embryonic fibroblasts (3T3 cells) are seeded in the gel. Within a period, state of 3T3 cell living in the 3D gel scaffold is observed. As a result, when collagen solution is mixed with 3T3 cells and incubated in vitro, the gel is formed and provides a three-dimensional space for 3T3 cells proliferation at the same time. This study provides a method to make tissue engineering scaffold with cells in situ and predicts its application in soft tissue defect healing.
Low Potential Electrochemical Polymerization of 1-Hydroxy-2-Methoxybenzene and Characterization of its Polymer
Authors: Huang Yao , Ma Mu Lin , Liu Hou Ting , Xu Jing Kun , Zhang Ge , Qin Lei Qiang
Published: February 2012

The electrochemical polymerization of 1-hydroxy-2-methoxybenzene (HMOB) was performed in boron trifuoride diethyl etherate (BFEE) and a novel conducting polymer poly(1-hydroxy-2-methoxybenzene) (PHMOB) was easily electrodeposited. The oxidation onset of HMOB was initiated at 0.97 V versus a saturated calomel electrode (SCE). PHMOB films obtained from BFEE showed good thermal stability. NMR studies showed that the polymerization of HMOB occurred at C4 and C5 position. Fluorescent spectral studies indicated that doped and dedoped PHMOB were good blue emitters, with the same excitation wavelength maximum of 348 nm.
Oil Spills Identification in SAR Image Using Mahalanobis Distance
Authors: Chen Peng , Zhou Hui , Wang Xiao Tian
Published: February 2012

This paper presents a method of oil spills identification in Synthetic Aperture Radar (SAR) image based on feature vector, it makes use of the advantages of SAR which can work on day and night and all weather conditions with high resolution monitoring for oil spills. Use the algorithm of Mahalanobis distance to identify the target object and gain the feature vector through evaluating SAR image of the dark area boundary. It is proved by experiment that the number of selected feature value is reasonable and more effective for estimating whether has oil spills than the traditional one. The accuracy rate can reach 96% or even more for using the algorithm of Mahalanobis distance and compare to the other methods of oil spills identification it is easy for programming implementation with less conditions .
Web-Based Bioinformatics Analysis of TbpB from Actinobacillus pleuropneumonie L20 Strain
Authors: Li Ren Feng , Tian Xiang Qin , Zhao Kun , Jiang Jin Qing , Wang San Hu
Published: February 2012

The transferring(Tf) receptor from Actinobacillus pleuropneumoniae (App) is comprised of a surface exposed lipoprotein, Tf-binding protein B (TbpB), and an integral outer-membrane protein, Tf-binding protein A (TbpA), both of which are essential for survival in the host, and TbpB is required for the iron acquisition process in vivo. In this study. We analyzed the salient features of the TbpB gene and encoded protein of App L20 strain by bioinformatics tools and highlighted its important biological characterization, which. providing insights into the mechanism of Tf binding and the role of TbpB,
Flammability and Mechanical Properties of EVA Composites Containing Ammonium Polyphosphate Microcapsules
Authors: Wang Zheng Zhou , Zhang Bin , Jiang Ping Kai
Published: February 2012

Flame retardant and mechanical properties of ethylene-vinyl acetate copolymer (EVA) composites containing ammonium polyphosphate (APP) and its microcapsules, MFAPP with a shell of melamine–formaldehyde resin and EPAPP with a shell of epoxy resin, were evaluated in EVA. The results indicate that APP after the microencapsulation leads to an increase in LOI in EVA compared with APP. When dipentaerythritol is added into the EVA composites containing APP microcapsules, a further improvement in flame retardancy of the composite is observed. Moreover, thermal decomposition behavior and mechanical properties of the EVA composites are investigated.
Efficient Simulation of Grain Burning Surface Regression
Authors: Liu You Quan , Yin Kang Xue , Bao Fu Ting , Liu Yang , Wu En Hua
Published: February 2012

The computation of grain burning surface regression plays a very important role in the internal ballistic performance evaluation of solid rocket motor, however, the traditional methods such as geometry-based one could not handle the self-intersection and characteristic geometric element disappearing problems. This paper presents an effective and efficient framework to simulate 3D grain burning surface regression with level set method which is combined with Fast Marching technique to constrain the calculation area only around the burning surface. At last, a typical grain example is given by our framework to verify our method’s effectiveness and efficiency.
Synthesis of n-Butyl Salicylate Catalyzed by Boric Acid
Authors: Zheng Yong Jun , Zhang Ji Chang , Lu Hui Chao
Published: February 2012

Boric acid (H3BO3) was an inexpensive, efficient and mild catalyst for the synthesis of n-butyl salicylate from salicylic acid and n-butanol, the esterifcation process conditions were optimized, the experimental results showed that the new process used small amount of boric acid catalyst, got higher target product yield, thus reduced the cost of production.
New Polymeric Membrane Sensor Doped with N,N’-Bis(benzoin)-1,2-Phenylenediamine for Selective Determination of Aluminum
Authors: Liu Xin Lu , Xie Bin , Pan Xun Hai , Qiao Kang Quan , Wang Ying
Published: February 2012

A new polymeric membrane sensor for Al3+based on bis(benzoin)-1,2-phenylenediamine as a neutral carrier was investigated. The proposed sensor exhibits a near-Nernstian response for Al3+over a wide linear range of 3.0×10-7to 1.0×10-1mol/L, with a detection limit of 1.0×10-7mol/L and a slope of 19.7±0.3 mV/decade. The sensor displays a good selectivity toward Al3+over other cations in pH range of 2.5 to 4.0. It has relatively fast response time (8 s) and can be used at least for 3 months without considerable divergence in potential. The response mechanism was discussed in view of the A.C. impedance technique. It was successfully used as an indicator electrode in the determination of aluminum in real samples.
Numerical Simulation and Prediction of High Fluorine Groundwater Transport in Zhangye Basin
Authors: An Yong Hui , Han Shuang Bao , Wu Xi , Cheng Xu Xue , Liu Wei Po
Published: February 2012

Simulate Feflow with finite element method, and establish flow model and solute transport model of high fluorine groundwater area in Zhangye Basin. Predicting groundwater system response under different exploitation scheme, and evaluating the risk of deep low fluorine groundwater polluted by shallow high fluorine groundwater. The results showed that, firstly, the existing exploitation intensity and the increasing exploitation intensity of the local planning would lead to groundwater table descent, for the deep groundwater head is higher than phreatic water in above scheme, the polluted risk of low fluorine freshwater is low. Secondly, low and deep groundwater “cross strata” caused by well completion technology would lead to deep low fluorine freshwater polluted, and the high fluorine polluted area caused by single well is limited, but the polluted risk of low fluorine aquifer is increasing with that confined water head is lower than phreatic water in local concentrated excess exploitation area. Propose the measures and suggestions of the groundwater sustainable utilization.
Upper Spectral Bound of Biharmonic Operator Eigenvalue Problem by Bicubic Hermite Element
Authors: Ren Shi Xian , Yang Yi Du , Bi Hai
Published: February 2012

This paper uses the bicubic Hermite element to compute the first four eigenvalues of the vibration problem of clamped plate by Matlab program and gives upper bound of the exact eigenvalues. Combing Matlab experiments on Morley element for lower spectral bound we can provide a range of the exact eigenvalues of biharmonic operator more accurately.
Numerical Controlled Process of Tube Sheet on Phthalic Anhydride Switch Condenser
Authors: Wang Zheng Fang
Published: February 2012

Phthalic anhydride switch condenser was imported, failure occurred many times after put in use. There are ellipsoidal winged tubes in them and the holes on tube sheet are ellipsoidal too, which is very difficult to manufacture. Established mathematics model, analyzed the mathematic relation, compiled NC program, realized the numerical controlled process of ellipsoidal hole on MITSUBISHI MCV-1700 machining center, and realized domestic manufacture of phthalic anhydride switch condenser. Analyzed the error of process and selected proper cutter too. Machining center was imported in 1990’s, which CPU is only on 80386 levels, when the NC program is complex, the velocity of calculate will lower than the feed of end mill. The program is compiled with EIA code, which is difficult for most of engineers, took a common PC as program editor to compile program with Quick BASIC, then more technicians can compile program. This improved the procession of process and enlarged the range of machining center.
Preparation and Characterization of Chiral Cyclosiloxane-Based Liquid-Crystalline Elastomers Bearing Menthyl Groups
Authors: Li Qian Yue , Xu Jun , Zhang Wen Zheng , Li Peng
Published: February 2012

Chiral side-chain liquid-crystalline elastomers (LCEs) IP~IVP containig menthyl groups were synthesized by a one-step hydrosilylation reaction. The chemical structures and LC properties of the monomers and polymers were characterized by use of various experimental techniques. The effect of crosslinking mesogens on mesomorphic properties of the chiral LCEs was studied by swelling experiments. All the samples IP~IVP showed cholesteric mesophase when they were heated and cooled, proved by visual observation and X-ray measurements. The glass transition temperature (Tg) of elastomers increased slightly with increase of crosslinking mesogens in the polymer systems, but mesophase-isotropic phase transition temperature (Ti) decreased slightly, suggesting that the temperature range of mesophase became narrow with increase of crosslinking mesogens for all the elastomers. The maximum reflection bands shift slightly to long wavelength and become broad at the same temperature, indicating that the helical structure is partially disrupted because of both the constraint of chemical crosslinking agents and the different mesogenic units.
The Distributed Control of Multi-Kiln Wood Drying Environment Based on Multi Agent System
Authors: Zhang Xue , Liu Ya Qiu , Zhang Qian Long
Published: February 2012

This paper introduces the basic performances of the multi-agent system. And according to the wood drying kiln distributed characteristics and the actual requirements of the wood drying factory, apply Multi-Agent System to the control of the wood drying; establish a multi-agent control system with the hierarchical control method. The system efficiently achieves the distributed control environment of the wood drying. And discuss about the real-time agent’s hardware structure in detail. Meanwhile apply the fuzzy theory to real-time intelligent agent’s software algorithm. And use it on the simulation experiment. Experimental results show that this method can improve the overall efficiency of the system. Application with this method in wood drying control is advanced.
Numerical Analysis on Influencing Factors of U-Shaped Disease of Asphalt Pavement Using ABAQUS Program
Authors: Liu Li , Hao Pei Wen
Published: February 2012

The U-shaped cracking of high-grade semi-rigid base asphalt pavement was studied. A finite element program (ABAQUS) was used to conduct a mechanical model to analyze the effects of the interlayer conditions and overloads on U-shaped cracking. The results show that the generation and development of U-shaped cracking is significantly influenced by interlayer conditions and overloads. Furthermore, the asphalt-to-asphalt pavement layer conditions provide for a more remarkable effect on U-shaped cracking than the asphalt–to-base pavement layer conditions. To reduce the development of U-shaped cracking, two aspects work must be reinforced: (1) the interface conditions should be improved to ensure the shear strength between layers of surface course and avoid slippage failure between layers of asphalt pavement, (2) over loading vehicles must be limited.
ARM-BASED Online Detecting System of Storage Battery
Authors: Xue Qing Jun , Chen Chao
Published: February 2012

The proposal of ARM-based online detecting system of storage battery was suggested for the need of precise control of the working voltage and temperature of base stations of China Mobile. In terms of hardware, ARM7-LPC2368 of NXP Semiconductor was chosen as the processor chip, and the online detecting system was constructed using three modules: information acquisition, kernel control and battery. As for software, our proposal adopted the top-down design philosophy and modularized designing method and also embedded uC/OS-II which significantly improved the utilization rate of CPU. At last, the system precisely met the requirements of the proposal by field tests at base station of China Mobile, thus, verified the feasibility of the proposal.
Design of Intelligentized Testing System of Airborne Electromechanical Controlling Device
Authors: Zou Tao , Xu Heng Cheng , Yang Wen Jie
Published: February 2012

Electromechanical controlling devices (ECDs) plays an important role in electromechanical controlling system. There is a large quantity of electromechanical controlling devices (ECDs) on an airplane which concerning every specialists, and it has a very complex logic control. We developed this system because the construction ,working principle and working condition of the ECD often result in latent failure an some kind of failure that hard to carry out troubleshooting .The system centered by an embedded IPC applies module design in both hardware and software system, and it develop testing application with AVI running under Windows XP operating system, which makes it bound to have certain qualities ,such as good universality, integrity, complete functions, easy to operate and high degree of automation, also it is reliable , maintainable, flexible, adaptive, and the ability on expansion is very impressing . Application of this system will greatly improve the working efficiency and cut the time of inspection and troubleshooting, which means better intact rate of combat readiness of aircraft and mission availability rate, with significant military and economic benefit.
Optimization Analysis of Thin-Walled High Pier
Authors: Dong Xiao Mei , Wen Yan
Published: February 2012

According to the restriction of the stability and intensity, size optimization of the high piers’ section is calculated by using the current FEM software ANSYS, by means of differential coefficient. The results of the calculation and analysis indicate that the parameter optimization of the piers’ section of Long-span continuous rigid frame bridges is feasible by using the optimization model together with the finite element method, and the results are provided reference for optional design of similar bridge
A Type of Fighter Dynamics Modeling and Simulation
Authors: Zhao Ding Xuan , Li Ying Jie , Yang Guo Jun , Hao Qing Bo , Liu Gang , Xu Miao
Published: February 2012

Dynamics model of fighter was proposed in order to drive on flight simulator virtually. The model took Lagrange equation as basis and simplified analysis of the force on fighter according to the real-time input state information from joystick. The dynamics equation was solved in real time using Runge-Kutta method (RK4). It was proved finally that the model and simulation algorithm had higher dependability through datum and simulation scene which was obtained with graphics engine OpenGVS and 3D visual modeling Software Multigen Creator.
The High Voltage Power Quick Switching Device and it’s Effect on the System
Authors: Zhou Xue Song , Zhou Jin Cheng , Ma You Jie , Yang Ya Guang
Published: February 2012

The standby power quick switching device can solve the continuous safe operation of auxiliary power problems. The paper firstly analyzes the basic principle of the quick switching device, and then discusses the possible impact of the quick switching device on the auxiliary power system, and summarizes the influences of different switching ways to the system. At last it concludes that to effectively improve the influences of the quick switching device to the system, we should increase the switching speed of the devices as possible to work in quick-switching mode, so that has certain significance to people of the actual power grid operation.
The Identification Method of Igneous Rock Lithology Based on Data Mining Technology
Authors: Zhang Jun , Li Jun , Hu Yao , Zhou Jin Yu
Published: February 2012

Igenous rock is featured with complex and multivariant lithology, its logging response is multiplicity, therefore, it is difficult to identify igneous rock lithology with logging data. To Lay the foundation for fine logging evaluation of igneous reservoir in Songnan gas field, the identification method of igneous rock lithology is researched. Common crossplot method identify lithology with only two logging parameters, its precision is not high. To improve the accuracy of identification, the data mining software, named as weak, is used, three data mining methods, including Association Rule, Decision Tree, Support vector machine, are applied in lithology identification. The results show that these methods can improve the accuracy of lithology identification, in particular, Decision Tree model has the highest recognition accuracy, while it is relatively easy to understand, so it can be used as auxiliary tools for recognition of igneous rocks. Decision Tree model is used to process logging data of exploratory well, and its computation results are well consistent with the core thin section data.
Simulation Research and Analysis of an Improved Direct Torque Control System
Authors: Lang Bao Hua , Yang Jian Hua , Liu Wei Guo
Published: February 2012

For enhancing operating efficiency of direct torque control system of salient-pole permanent magnetism synchronous machine, an improved direct torque control method which based on maximum torque per ampere(MTPA) is proposed. In the article firstly the new method theory inferential reasoning and the project short-cut method are elaborated. Then the simulation results which are comparison with conventional DTC are given using Matlab/Simulink. Finally the stable analysis and the dynamic analysis are given separately. The simulation and analysis show that the new method maintains fine dynamic property of conventional DTC, but also may raise system's stable operating efficiency effectively.
Research on Suspension System Based on Radial-Basis Function Algorithm
Authors: Tang Chuan Yin , Zhao Guang Yao , Zhang Yi Min , Ma Yan
Published: February 2012

In this paper, a four degrees of freedom half body vehicle suspension system is developed .The Radial-Basis Function network algorithm is used to control the suspension system. With the aid of software Matlab/Simulink , the simulation model is achieved. A lot of simulation work is done. Simulation results demonstrate that the proposed active suspension system proves to be effective in vibration reduction of the suspension system.
Control System Design and Implementation of a Quadrotor Unmanned Aerial Vehicle
Authors: Xu De Xin , Li Guang Chun , Wang Lu
Published: February 2012

In this paper, a method of embedded system with multi-processor is proposed, so as to satisfy the requirement of strong real-time property, high computational performance and multi-task function of the flight control system. In addition, in order to solve the problems of unknown aerodynamic disturbance and weight uncertainties during flight, a hybrid control method based on sliding mode control (SMC) and model referenced adaptive control (MRAC) is proposed. Through the Lyapunov stability analysis, it’s proved that the controller is stable. Various simulations were performed and several experiments on the quadrotor UAV validate the control strategies.
Structures for Reachability Problems of Multirate Hybrid Systems
Authors: Zhang Hai Bin , Yang Li Ya
Published: February 2012

This paper investigates symbolic reachability issue of multirate hybrid systems. To this end, a constraint system called multirate zone is formalized for the representation and manipulation of multirate automata. To represent multirate zones, a data structure difference bound matrix for multirate zones is defined. In addition, to handle unions of multirate zones and data sharing, a BDD-like data structure multirate hybrid diagram is also defined. These enable us to do symbolic reachability analysis of multirate automata in an efficient way.
Study and Application of a Slide Mode Control on Pneumatic Force Servo System
Authors: Yang Yan Li , Shi Wei Xiang , Cao Yan , Lei Lei
Published: February 2012

In this paper, a sliding mode control approach combined with the boundary saturation function approach is put forward and used in a pneumatic force servo system to achieve an exact force control. First, a comparatively accurate model of the system is obtained by using the system identification approach and an analysis is made on the time-varying nature of the model. Then, it is designed by use of the boundary saturation approach, thus overcoming the system instability caused by the non-linearity of the proportional pressure valve and the change of the temperature inside the air cylinder. Finally, the performance of the pneumatic force servo control system is simulated and a comparison is made with the PID control. Results show the feasibility and effectiveness of the approach.
Analyses of Coupling Effect of Load Simulator of Aircraft Control Surface on Actuator Simulation Loop
Authors: Tian Ju , Hu Cheng Wei
Published: February 2012

At present the design of the aircraft control surface simulator is all about how to eliminate the redundant moment and increase the tracking accuracy of load simulator. In this paper, for the abnormal phenomena appeared in the semi-physical simulation loop of the load simulator, a simulation analysis was made to illustrate that there is a strong coupling effect between the load simulator and the actuator simulation loop, and increasing the tracking accuracy of load simulator simply can not eliminate the effect on the semi-physical simulation system. Therefore, there are some limitations in the design of load simulator based on its performance indexes only.
A Multimode Controller Design for a TBM Autopilot with Optimal/Classical Approach
Authors: Li Li , Huang Guo Qing , Yang Ming Xiang , Yu Min
Published: February 2012

This paper introduces design of a multimode controller for a Tactical Ballistic Missile autopilot that combined optimal control method with classical frequency domain analysis. In the paper, optimal control method is used to system structure design and to determine gain coefficient, frequency constraints in classical control theory are used to limit the weighting coefficient matrix of objective function in order to ensure system robustness. The simulation results show that the corresponding system responses have better quickness and some robustness, but the overshoot becomes a bit larger with contrast to traditional method.
Experimental Study on Spray Materials at Low Temperature
Authors: Lin Yue Zhong , Lai Yong Qiang , Zheng Li Jie
Published: February 2012

According to the low temperature spray process, using double quick cement, retarder, water retaining agent, water reducing agent, polymer, fiber was investigated using orthogonal theory the feasibility of preparation of guniting material. Through the experimental research prepared early strength, high adhesiveness, high crack resistance, high economic performance of gunite material, its each index can meet the requirements of the application.
Design of 2-DOF Precision Positioning Table for IC Packaging
Authors: Feng Xiao Mei , Li Li Shun , Zhang Da Wei , Liu Wen Kai
Published: February 2012

A VCA direct-drive 2-DOF precision positioning table is put forward, which can be applied to IC packaging for wafer wire bonding equipment. With the help of a novel elastic decoupling mechanism, the VCA is mounted on the baseboard, diminishing its moving inertia, improving its dynamic performance. The table structural is detailed and its dynamic design approach is proposed. The prototype experiment shows that the new 2-DOF positioning table is of higher speed and higher accuracy than the traditional ones.
Thermal Error Robust Modeling for High-Speed Motorized Spindle
Authors: Lei Chun Li , Rui Zhi Yuan , Liu Jun , Ren Li Na
Published: February 2012

To improve the manufacturing accuracy of NC machine tool, the thermal error model based on multivariate autoregressive method for a motorized high speed spindle is developed. The proposed model takes into account influences of the previous temperature rise and thermal deformation (input variables) on the thermal error (output variables). The linear trends of observed series are eliminated by the first difference. The order of multivariate autoregressive (MVAR) model is selected by using Akaike information criterion. The coefficients of the MVAR model are determined by the least square method. The established MVAR model is then used to forecast the thermal error and the experimental results have shown the validity and robustness of this model.
Simulation and Analysis of Reinforced Concrete Beam Stress Performance at Ultra-Low Temperature Based on DIANA
Authors: Liu Shuang , Lv Chao
Published: February 2012

For the study of reinforced concrete beam stress performance under ultra-low temperature, based on the material constitutive and mechanism at ultra-low temperature. The concrete constitute model and the simulation model are presented by DIANA software environment, the numerical simulations is implemented. The component test is expanded, and the experimental program is presented. The result of component test is compared with the simulation of DIANA. The results show that the reinforced concrete beam bearing capacity and stiffness are increased with lower temperature.
Multi-Parameter Methods of Comprehensive Performance Evaluation for Aero-Engine
Authors: Hao Yi , Wang Li , Jiang Xuan
Published: February 2012

Comprehensive performance evaluation for aero-engine is essential in the stage of operational management in an airline company. Based on the features of aero-engine, this paper focuses on the implement of fuzzy comentropy method which is combined of fuzzy mathematics and rough set theory in the practical performance evaluation of aero-engine. By comparative analysis with principal component analysis, this paper reaches the conclusion that the fuzzy comentropy method has more advantages of computer programming, being free of expertise, preventing information loss. However, the accuracy of multi-parameter evaluation method depends upon the information content provided by the initial data; therefore, the pre-processing of data in decision-making and method itself are still worth in-depth study and improvement.
The Engine Fault Diagnosis with RBFNN Based on AIC
Authors: Huang Qiang , Ouyang Xiao Zhuo , Wang Cheng
Published: February 2012

In this paper, an engine diagnosis method with high precision and quickly response is proposed. Firstly, the Akaike Information Criterion (AIC) is used to improve the performance of the neural network to build the fault diagnosis model. Then the vibration signals are analyzed to estimate the states of the diesel engine. Finally, the five states of diesel engine are set to validate the veracity of diagnosis method. According to experiment and simulation researches, it indicates that the diagnosis method with RBF neural network based on AIC is effective. The veracity of identification is 100% to the single fault. It is a valuable reference to the vibration diagnosis for other complex rotary machines.
Risk Analysis of Robust Recursive Updating Model
Authors: Yang Hui Yong , Zhao Chao
Published: February 2012

Robust recursive updating model is insensitive to the outliers in observed flow data and is effective to obtaining stable flood updating accuracy. At the same time, it is risky to detect falsely good value as outliers. Using Monte-Carlo method, the relations between risk and effect of model are got. The study results indicate the risk of the model is impacted by frequency of outliers.
Determination of m-Cresol and p-Cresol in Industrial Cresols by Raman Spectrometer
Authors: Yu Hui Ying , Yan Ping
Published: February 2012

Adopting raman spectrometer to conduct qualitative and quantitative analysis of m-cresol and p-cresol, selecting the respective character peak of bencycloquidium after deformation vibration (m-cresol at 732 cm-1 and p-cresol at 841 cm-1), via experiment and calculations, the relative raman cross section of m-cresol and p-cresol can be concluded:(∂σ/∂Ω)732cm-1/(∂σ/∂Ω)1000cm-1 is 0.74 (height-fitting of the peak), and 0.61 (area-fitting of the peak). This method samples simply and rapidly, and has a short testing time, whose quantitative analysis result of m-/p-cresol is consistent with that of GC analysis.
Development of a Practical Scanning Acoustic Microscopy
Authors: Liu Zhong Zhu , Xu Chun Guang , Zhao Xin Yu , Guo Xiang Hui
Published: February 2012

Scanning acoustic microscopy (SAM) is a powerful non-destructive testing tool used in electronic, material and medical testing area. Commercial SAM products are generally too expensive to be extended to common users. Therefore, a practical SAM system had been developed using high-frequency ultrasonic focus transducers, a wide-band pulse transmitter/receiver, a high-speed data acquisition card, and a high-precision motion system. The SAM　system's precision and function can meet the requirement of practical test adequately, and the cost is much lower compared to commercial products. Several kinds of imaging method were introduced, and the SAM system has the ability to accomplish full-wave data acquisition.
The Design of Control System of Camshaft Grinding Machine Based on FANUC 0i-TC
Authors: Ren Ai Hua , Sun Chuan Qiong
Published: February 2012

Grinding machine is widely used in the camshaft producing process. H187 slanting headstock camshaft grinding machine is upgraded from the original relay, contactor and other electronic controlled system into PMC controlled CNC machine tool by using FANUC 0i-TC system, which is not only to adapt to the current auto industry production mode of “more batches and more variety”, but also to improve the production efficiency and the manufacturing quality. The upgrading process is introduced especially from the following aspects such as the design of CNC system architecture and electrical control system, development of grinding feed NC program and PMC program. It is proved that this transformation fully realized the expected goals from practice.
Sliding Mode Control of Electronic Throttle Valve Based on Rapid Control Prototyping
Authors: Wu Jian , Zhao Yang
Published: February 2012

In modern engine controlling, in order to adjust air-fuel ratio, electronic throttle valve systems are widely used in combustion engines. However, some difficulties arise in electronic throttle valve control due to multiple nonlinearities. Against this background, this study discusses the design of a throttle valve controller which is aimed to optimize control of throttle valves. Discussion is first made of how to model the electronic throttle valve. Then the design of the sliding mode controller is examined. Finally, a comparison is made of the simulation and experimental results.
A Synchronous Control Strategy for Independent Multi-Motor System Based on CMAC
Authors: Xu Wei Min , Ding Bao Bao , Geng Rui , Zhou Xian Wen
Published: February 2012

With progress making in the art of industrial fields, control methods for synchronized multi-motor systems get more and more extensive applications, and there are increasingly high requirements for synchronous controllers. In this paper, a new control method for multi-axis drive systems is proposed, an adjacent-coupling algorithm based synchronization control strategy is designed, and a CMAC neural network based controller is developed. Simulation results show good performance of synchronization control accuracy, interference immunity, and convergence for the suggested synchronous controller
The Limiting Performance Analysis of the Shock Isolation System
Authors: Lou Jing Jun , Sun Jiong , Tang Si Mi
Published: February 2012

The conventional design of the shock isolation system has focused on selecting suitable stiffness only, so high shock isolation efficiency always gives rise to large relative displacement. In order to design an optimal passive shock isolator, the limiting performance of the shock isolation system is analyzed. The relationship between the shock isolation criterion and the critical initial velocity is studied. The optimal control force is derived and the possibility of engineering implementation of the optimal control force is discussed. The limiting performance analysis shows that the performance of the optimal shock isolator is much more excellent than that of the conventional shock isolator.
Study on Alkali-Oxygen Pulping of Bagasse Wet-Stored with Hypochlorite Bleaching Waste Water
Authors: Li Hong , Sun Bing , Liu Yu Xin , Chen Ke Li
Published: February 2012

In this paper, the bagasse wet-stored with hypochlorite (H) bleaching waste-water which was the original waste liquid from H bleaching process of bagasse, was cooked with alkali-oxygen and its pulping effect was studied. The results showed that the proper treatment time of wet storage with H bleaching waste-water was 12 days, the pulping properties were as follows: screened pulp yield 62.9%, kappa number 15.4, viscosity 802 mL/g, and brightness 58.8 %ISO. The strength properties of pulp were as follows: tensile index 65.6 N•m/g, tear index 5.86 mN•m2/g, burst index 3.83 kPa•m2/g and folding endurance 302 times. In addition, the pulping properties of bagasse wet-stored with H bleaching waste-water were similar to those of bagasse wet-stored with fresh water. Therefore, it can be concluded that the H bleaching waste-water could be used as spraying water for wet storage of bagasse. It was a new idea for saving fresh water in the pulping and papermaking industry.
The Mobile Robot Design Research Based on CNC Machine Group
Authors: Chen Si Jie , Gu Ji Nan , Hu Dian Chuan
Published: February 2012

The Paper Works on the Intelligent Mobile Robot for Economic CNC Machine or Reformed CNC Machine According to the Chinese Enterprise’s Situation, which Can Automatically Finish next Three NC Procedures, Charging, Discharging and Tools Changer, so as to Economize on Manpower and Reduce Product Cost. the Actuator of Robot Is Double Four Bar Linkages, which Realized No Blind Zone in Workspace. in Order to Achieving Remote Control, CNC Machine Group Network Was Built by Newest Technology such as Zigbee Wireless Communication Technology, GPRS, and 3G Module. Except for these, Visual Navigation System Was Equipped to Accomplish the Accurate Orientation in the Procedure of Charging, Discharging and Tools Changer. the Robot Can Intelligently Estimate the Work Condition by Synthetically Use of Pattern Recognition Technology, Multi-sensor Information Technology, and Embedded Technology, which Impressively Improve Efficiency and Automation Level.
Design and Analysis of a Two-Valve Control Hydraulic System for Controllable Pitch Propeller
Authors: Zhang Chang Jun , Li Jing , Jiang Hong Gang , Chen Yun , Yin Yao Bao
Published: February 2012

This paper designs a two-valve control hydraulic system for controllable pitch propeller which consists of an electro-hydraulic directional control valve and a proportional directional control valve. The parallel control strategy is proposed and respective controllers are determined for the system. It yields out the relationship between the control parameters and valves characteristics by modeling and simulation analysis. Also the influence of the proportional valve flow rate on pitch control accuracy is discussed.
Study on Dynamic Hybrid Position/Force Control of Two Coordinated Manipulators
Authors: Chen Guo Dong
Published: February 2012

A dynamic hybrid position/force control method is developed for the coordination of two manipulators of a dual-arm robot to cope with the case of dual-arm tightly cooperate a common rigid object in the presence of environmental constraint. Begin with the definition of a group of generalized motion and force vectors used for task description, and by synthesizing the object dynamics and manipulator dynamics, an object-oriented dynamic equation of the dual-arm rigid coordination system is first derived, where relationships between object motion, internal stress force, and environmental contact force are explicitly presented. Furthermore, this equation and that of single arm dynamics in Cartesian still remain the same form. Based on this definition and description, the dynamic hybrid position/force control scheme for dual-arm symmetric coordination is then designed, and the decomposition and parallel realization of the control algorithm is also discussed. Several experiments have been done on two coordinated PUMA562 robot manipulators, which show that the proposed method works effectively, where the object motion and internal/external force can be simultaneously controlled during cooperation.
The Design and Experiment of Energy Saving Power-Assisted System of Portable Electric Tool
Authors: He Xin Sheng , Gao Chun Fu , Wang Bin , Xie Chu Xiong
Published: February 2012

Since the heavy current and frequent start-stop of portable electric tool, the special energy saving power assisted system is designed. The method for solving these problems is to make a binary power supply with super capacitor and lead-acid battery. The super capacitor provides power assistance to increase output current when starting and recycles inertia energy when stopping, the energy distribution is done by control system. In this paper, the operation principle and control circuit are described and the effect of the proposed system is tested by experiment. The experiment results show that the proposed system double the output current and save energy around 20%. In this way, the problems of short-lifetime and inefficient power take off are solved and this energy saving power assisted system is also appropriate to electric mobile and so on which employ secondary electric power supply as power.
Study of Variation Equivalence in Machining Process
Authors: Gang Ting Ting , Yang Jun , Zhao Yu
Published: February 2012

In this paper, the variation equivalence problem in machining process is investigated. First, the variation equivalence model is introduced to study the equivalent transformation among different variation sources. Then we propose a concept of maximum possible variation equivalence area, based on which an approach to estimating the possibility of occurrence of the variation equivalence phenomenon is given. An example is presented to illustrate the proposed approaches.
Thermal Response Analysis of Barrel of ISAW
Authors: Zhao Yan Jun , Fan Qin Man , Ge Wen Qing , Xu Cheng
Published: February 2012

Aim at Individual Soldier Automatic Weapon (ISAW), three-dimensional FE model and thermoelasticity coupling model of barrel were built. The coupling temperature field and coupling stress field of the barrel were calculated. Laws of the coupling temperature field and coupling stress field were obtained. The coupling temperature field and coupling stress field of different set of barrel aim at automatic fire were compared. The results show that the Material Properties of the barrel is security. Current research work will be helpful the Individual Soldier Automatic weapon design and the life of barrel study.
Study on the Test of Concrete Strength in Winter Construction by a New Technology: Noumenon Sampling Method
Authors: Zhang Guo Zhi , Gao Wei
Published: February 2012

A new measure control technology for testing the compressive strength of concrete structures which is called noumenon sampling method is put forward. The concrete strength of different curing time was got from the application of noumenon sampling method in the detection of winter construction concrete structures. According to the grey system theory, the GM (1, 1) model is used to establish the prediction model of the concrete strength. The established model can be used to determine when the concrete structures will achieve the critical strength in frost resistance. This determination can provide scientific basis for the quality control of concrete in winter construction. Analysis and calculation show that the predictions agree well with the experimental data. The result is ideal. So the prediction model can be applied as a new method for controlling the concrete structures strength in winter construction.
Research on the Cutting Heat and Wear of Indexable Inserts with Different Transition Surfaces
Authors: Zheng Min , Gang Tie Qiang , Yao Bin , Li Fei , Song Yin
Published: February 2012

The transition surface of blade tip has direct impacts on the quality and lifespan of indexable inserts. For rectangle indexable inserts with four different transition surfaces, the paper analyzed how the transition surfaces put impacts on the cutting temperature and wear of inserts by finite element analysis software. The simulation results show that clearance angle of inserts has serious impacts on the blade performance. Besides, to control the clearance angle in an appropriate range , the cutting temperature and wear of insert would decrease accompanying with the rise of clearance angle.
A Novel Motion Retrieval Method Based on Revised Matching Algorithm and High Dimensional Index
Authors: Xiang Jian
Published: February 2012

This paper proposes a method to speed up motion retrieval: matching algorithm improvement and motion high-dimensional index. The fast elimination algorithm is used to delete most of motions that are not similar with samplings. Then indexing of high-dimensional feature is done with 3D motion data structure. The experimental results show that our method outperforms the classical motion retrieval method both in speed and accuracy.
Development of Grinding and Cutting Scientific Data Sharing Platform
Authors: Hua Li , Li Bao Ying , Zhang Lin Zhong , Fu Guang Yu , Hu Ming Ming
Published: February 2012

This author had platform development take network shared data as realization and application technical targets, MySQL5.0 as the background database, Tomcat5.5 as the Web server, adopted J2EE architecture, MVC framework to achieve Database platform creation, publishing and management functions, had data information focus on collection, organization and technical processing of grinding and cutting and related expertise areas, building the eight databases of grinding tools, equipment, academic papers, industry trends, technical standards, professional books bibliography, websites and scientific and technical literature bibliography, including multiple literature types such as academic papers, conference literature, assembly, tool images and specifications, equipment images and specifications, state and industry technical standards, network digital resources and other scientific information.
The Determination of Dynamic Stiffness of Dish-Shaped Metal Corrugated Pipe by Use of Random Vibration Method
Authors: Rui Li Ming , Zheng Mei Sheng , Tian Lian Jun
Published: February 2012

This paper simplifies the dish-shaped metal corrugated pipe into a elastic element, constitutes a single degree of freedom spring-mass system, then applicants the random vibration method to measure its natural frequency, further to calculate the dynamic stiffness of dish-shaped metal corrugated pipe. At the same time its static stiffness test is done. By comparison of two results, static and dynamic stiffness values fit well, and dynamic stiffness is closer to the actual working conditions. Random vibration method for dynamic stiffness is convenient, accurate and has application values in a wide range of engineering.