bluuebunny/crossref_metadata_2025 huggingface dataset:
Computational Modal Analyses of a Steel Nuclear Containment Vessel
Authors: Tian Chun Lai , Yang Lin , Zhao Rui Chang
Published: January 2014

In order to obtain frequencies and modal shapes of a nuclear containment vessel, the computational analyses have been carried out through free structure finite element analysis software. The finite element model of the vessel is built with shell element and solved by the type of the dynamics frequency solver. Results show that mainly deformation area is on the vessels cylindrical shell and the maximum displacements occur at its center. Compared with the design validation values, the frequencies obtained are a little lower. It may be because that the model built here is a completely vessel shell without any hatches or attachments. It is provided that a reliable method of computational structural analyses for the nuclear containment without commercial software cost.
Design on Test Bench of Safety Belt Emergency Locking Property
Authors: Tian Chun Yan , Yang Mei , Lan Zhi Huan , Ning Cheng Da , Ji Yi Guo
Published: January 2014

The mechanical system and controlling system of test bench of safety belt emergency locking property are designed. Safety belt emergency locking property of a moving cars rider can be simulated by changing direct currents acceleration, so multifarious cars safety belt emergency locking property can be examined by the equipment which is developed by using engineering computer as control center,PARKER1505 and VC6.0.Fuzzy PID control algorithm is adopted to decrease the influence and enhance the systems robust.
Precision Analysis of the Surface Model Based on Geomagic Qualify
Authors: Gao Dong Qiang , Ma Jin Feng , Lin Huan , Chen Chao Qun , Yang Fei
Published: January 2014

The precision analysis of surface model is one of the key technologies in reverse engineering.Analyzed the error sources of surface accuracy in reverse engineering,proposed an evaluation indicators of the surface accuracy,which are whether the reconstructed model is qualified.Taking rearview mirror for example,compared with the reconstructed model and the original point cloud data by three-dimensional and two-dimensional methods in Geomagic Quality software,obtained the deviation value of the whole model and three different directions,the results show that the error of the most data points is in the range of permissible,which is less than the pre-set error;take the reconstructed surface data and the original point cloud data for comparison, more than 94% of the total data points is in the range of permissible, prove that the fitting surface accuracy is qualified.
The Relationship between Frequency Domain Blind Source Separation and Frequency Domain Adaptive Beamformer
Authors: Qian Si Chong , Xiang Yang
Published: January 2014

As two important methods of array signal processing, blind source separation and beamforming can extract the target signal and suppress interference by using the received information of the array element. In the case of convolution mixture of sources, frequency domain blind source separation and frequency domain adaptive beamforming have similar signal model. To find the relationship between them, comparison between the minimization of the off-diagonal components in the BSS update equation and the minimization of the mean square error in the ABF had been made from the perspective of mathematical expressions, and find that the unmixing matrix of the BSS and the filter coefficients of the ABF converge to the same solution in the mean square error sense under the condition that the two source signals are ideally independent. With MATLAB, the equivalence in the frequency domain have been verified and the causes affecting separation performance have been analyzed, which was achieved by simulating instantaneous and convolution mixtures and separating mixture speech in frequency-domain blind source separation and frequency domain adaptive beamforming way.
Simulation Research on the Potential and Sencitivity Distribution of ECT System Based on Finite Element
Authors: Jiang Pan , Fan Shi Dong , Quan Wen , Xiong Ting
Published: January 2014

This paper firstly introduces the composition and mathematical description of the capacitance sensor, meanwhile, establishes the mathematical and finite element model of it. According to previous finite element model as mention above, this paper bases on FEM to compile the program and calculate the distribution of potential with shield and no shield. The program obtains result of the contour figuer of every node. Then comparing the potential value on nodes at the same place. In terms of previous analysis result, this essay amis to change electrode plate width and the length of radial shielding electrode by the order. In the meantime, it also research Potential value change in the same area and analyze the influence of potential distribution in those electrodes that were affected by the width of electrode and length of radial shielding electrode. In the end, this study obtains a lot of useful conclusions for the capacitance sensor design.
The Properties of Low Yield Ratio and High Heat Input Welding Construction Steel and the Microstructure of HAZ
Authors: Duan Dong Ming , Wu Run , Tang Meng Xia , Bu Yong , Chen Xiao
Published: January 2014

Steel with low yield ratio (YR0.75) and high heat input welding was made by combining Zr, Ti microalloying. Its microstructure investigated by optical and electron microscopes (SEM, TEM), consists of ferrite with the fine pearlite which not only ensures the high strength and toughness but also decreases the yield ratio. The steel was simulated in 100 kJ/cm heat input welding. The microstructures for heat affected zone (HAZ) of weldments mainly consisted of acicular ferrites which nucleate on fine Zr and Ti contained inclusions. The acicular ferrites decrease detrimental influence of grain coursing in the HAZ and make the steel good toughness in low temperature.
Dynamic Analysis and Simulation of Vertical High-Speed Feeding System Based on Direct-Drive Technology
Authors: Wang Zheng Tuo , Feng Zhen Li , Chen Shao Meng , Xu Yue Tong
Published: January 2014

Vertical high-speed feeding system which based on direct-drive technology possesses unique advantages, and has broad development potential. This paper describes the mechanical structure and working processes of vertical high-speed feeding system, analyzes the punching force and deformation of sheet metal, then establishes the dynamic equations, and finally conducts a dynamic simulation of punching stage and returning stage. And the simulation results in line with expectations.
The 3D Modeling and Characteristic Analysis of EBH300 Roadheader
Authors: Dong Zhi Feng , Huang Jian Nong , Wang Tian Hao , Liu Jie , Fang Li Yu
Published: January 2014

The EBH300 Roadheader is one of the important equipment in laneway excavation of coal mine. It composed of mechanical, hydraulic, electrical and control systems, and covered cutting, shipment and travelling. Because of its hard working conditions, the complex cutting force and load fluctuation and vibration during the working process, the mechanical parts design plays very important roll to the EBH300 Roadheader. The 3D models of the EBH300 Roadheader were built based on the engineering prototype. The mechanical characteristics were studied for further development, which included mechanical structure, the vibration modes of the cutting parts, maximum amplitudes by modal analysis. According to the result, more attention must be paid to the complex force condition, violent and irregular vibration of the cutting parts in the design.
Numerical Simulation on Water Absorption by MX-80 Bentonite for Nuclear Waste Disposal
Authors: Cai Guo Qing , Tian Hui , Li Jian
Published: January 2014

As a low permeability, high thermal conductivity and mechanical strength soil, bentonite has been widely used as buffer/backfill material for nuclear waste disposal. Underground water flow behavior in bentonite was studied in this paper. A numerical simulation was conducted to predict the water absorption test of MX-80 bentonite, which is worldwide known commercial material. ABAQUS was used for simulating the water flow in the soil column in which hydro-mechanical coupled model is taken into consideration. Darcys law and van Genuchten soil water retention curve model were used for water flow. Ideal elastic model, Drucker-Prager plastic model and wetting expansive model were taken to describe the stress-strain relations of the soil. Comparison between experimental and simulation results shows that the proposed numerical method is reasonable to predict the water flow in MX-80 bentonite.
Numerical Simulation on Effect of Pressure-Released Hole Combined Support with Rockbolt by Dynamic Loading
Authors: Song Xi Xian , Zuo Yu Jun , Zhu Wan Cheng , Jiang Cheng Yu , Wen Pai Ke
Published: January 2014

In order to study the effect on the structure of pressure-released hole combined support with rockbolt under dynamic loading, utilize RFPA2D-Dynamics on a numerical simulation of dynamic responses of roadway surrounding rock under different depths and different continued time of stress wave and different amplitudes of stress wave. It had gained the general law of the stress redistribution of roadway surrounding rock under static-dynamic coupling loading, and analysed the damage effect of static-dynamic coupling loading to surrounding rock from the perspective of acoustic emission energy release and failure units. Studies show that dynamic disturbance is the main inducing factor on instability of deep roadway supported by pressure-released hole combined support with rockbolt, the waveform of dynamic stress has important influence on broken surrounding rock, with the stress amplitude is the higher and the action time is longer, dynamic disturbance on stability of roadway bring about more significant effect would become.
Study on the Formation of Nanometer Silver Sol by Micro Arc Discharge
Authors: Yang Jing , Yan Zhi Yu , Sun Bing , Wang Qiao Min
Published: January 2014

A preparation of nanometer silver sol by micro arc discharge has been study here through the reduction of Ag3PO4. Sodium citrate and polyvinylpyrrolidone were added respectively into the electrolyte as stabilizer. The results show that, the Ag3PO4 concentration, stabilizer type and concentration have great impacts on the formation of the nanometer silver sol. By means of UV-VIS extinction spectrophotometer, scanning electron microscope and energy dispersive spectrometer, it is found that the solid powder extracted from the electrolyte solution after discharge is the aggregation of the silver formed in the solution and their original size maybe less than 20nm. Nanometer silver with smaller size and narrower size distribution can be obtained with sodium citrate as stabilizer than with polyvinylpyrrolidone. But the latter has higher conversion rate. From this experiment, we found that micro arc discharge can be a rapid, stable preparation method of nanometer silver sol.
Partition Scheduling Research of Hard Real-Time and Multi-Core System
Authors: Cheng Qian , Gu Qing Fan , Wang Li Song
Published: January 2014

For and multi-core in integrated avionics system used in the challenge, will partition scheduling on a single core changed concurrently on multi-core scheduling problems, we will partition into two partitions exclusive partitions and perform part to solve scheduling resource sharing and synchronization issues. We partition as a unit, to establish a and multi-core partition scheduling model and proposed approximate minimum core and multi-core partition scheduling algorithm to ensure exclusive partitions can be scheduled in the case, you can create a mapping for and multi-core partition to partition scheduling on multi-core .
Surrounding Rock Rupture Modeling of Tunnel Based on ANSYS
Authors: Ren Bai Cheng
Published: January 2014

This article is based on the real condition of a tunnel. By using displacement and stress contours get from finite element analysis software ANSYS, the simulation of the tunnel excavation is modeled and the regulation of overlying rock’s displacement and stress is deducted during the evacuation of the tunnel. The analysis result to overlying rock mass’ rupture regularity can be helpful for the control of surrounding rock’s stability and the improvement of supporting system. The result shows finite element analysis software ANASYS can be used to guide tunnel constructions during the evacuation.
Effects of Mechanical Stimulation on MMP-2 and TIMP-2 Expression of Scleral Fibroblasts after Posterior Sclera Reinforcement
Authors: Wang Guo Hui , Chen Wei Yi
Published: January 2014

To understand the effect of mechanical stimulation on posterior sclera reinforcement (PSR), the rabbit scleral fibroblasts after PSR were subjected to stretch in vitro and MMP-2 and TIMP-2 expression of scleral fibroblasts were evaluated. Three-week-old rabbits were monocularly performed by eyelid suturation randomly to prepare experimental myopia eye. After 60 days, the experimental myopia eyes were treated by PSR. After 6 months, the posterior pole scleral fibroblasts (normal sclera - group A, sclera after operation - group B and fusion region of sclera and reinforcing band group C) were isolated and cultured in vitro. The cells were subjected to cyclic stretch regimens (sine wave, 3% and 6% elongation amplitude, 0.1Hz, 48h duration) by FX-4000 Tension System. The MMP-2 and TIMP-2 expression of scleral fibroblasts were evaluated by ELISA method. The results show that after cyclic stretch to the scleral fibroblasts of the normal sclera and the sclera after operation, the MMP-2 expression was significantly reduced and the TIMP-2 expression was significantly increased, the MMP-2 and TIMP-2 expression of the scleral fibroblasts of the fusion region after operation was no changed. It was indicated that the mechanical stimulation could regulate the MMP-2 and TIMP-2 expression of scleral fibroblasts and play an important role in the process of treating high myopia with PSR surgery.
The Best Speed Limit Range for Road Hump
Authors: Lan Song , Gao Feng , Xu Guo Yan , Ding Neng Gen
Published: January 2014

Through simulating the process of vehicle running over humps in CarSim, calculating and analyzing the body vertical acceleration, the wheel load and wheel ground adhesion index for the car with different speeds that runs over road humps having different height and width, so as to obtain the effect of height and width of the hump on the deceleration performance and driving safety. According to the comparative analysis of the body acceleration, wheel load, wheel ground adhesion index, so as to obtain the best speed limit range of the road hump.
Sensorless Control of PMSM Based on Improved Sliding Mode Observer Method
Authors: Wang Zhi Fu , Zhang Fu Lin
Published: January 2014

This paper introduces an improved sliding mode observer for sensorless control of PMSM. In order to reduce the chattering phenomenon of traditional sliding mode observer, replace the ideal switching function with sigmoid function and use two-stage low frequency filter. At last, the simulation was done to verify the measures.
Research on the PID Tuning of Electric Power-Assisted Steering Test Bench System
Authors: Mai Yun Fei , Ding Wen Jing , Liu Shao Long
Published: January 2014

Electric power-assisted steering(EPAS) bench system can be used for fatigue and functional testing of automotive steering .To get a better performance and higher precision of EPAS system, theory analysis and simulation about passive loading system is carried out in this paper. A new strategy combined particle swarm optimization with PID algorithm is put forward to solve the shortcomings of traditional method. Simulations in different methods show the effectiveness of it.
Recent Development of Electric Vehicles
Authors: Yu Hui Chao , Lu Chun Guang
Published: January 2014

With the rapid development of the automotive industry, the demand for gasoline increases sharply. The gasoline cars cause serious environmental pollution. The application of electric vehicles can solve these problems. In this paper, the significance for developing electric cars is stressed first. Then the recent progresses in developing electric car battery, charging technology, drive motor are summarized. Different type of batteries and charging methods are introduced and their feasibilities are analyzed. The future trend of electric vehicles has been discussed as well. With the development of key technologies in electric car manufacture, todays energy and environmental problems will be solved to a large extent.
Investigation of Low Temperature Sintering of Low Voltage Varistor Based on TiO2
Authors: Lan De Jun , Wan Shu Quan
Published: January 2014

Low temperature sintering of TiO2-base varistor was systematically investigated through doing with V2O5 and B-Si glass. Pellets prepared could be densely sintered from 1273 to 1473K. The highest relative density, 94.6%, was found in the sample sintered at 1433K. According to I-V plots of ceramic pellets, the nonlinear coefficient α and breakdown voltage V1mA were obtained and found to be α=2~5 and V1mA=15~30V. The room temperature dielectric constant was very large, high as to about 20000. Powder XRD analysis has shown the desirable macro-structural characteristics of these compacts.
Dissolution of Tungsten Carbide in Remanufacturing Coating by Plasma Spray Welding
Authors: Du Xiao Dong , Li Lian Ying , Liu Guang Fu , Shen Jian , Zhou Dan
Published: January 2014

The tungsten carbide reinforced Ni-based alloy composite coatings are prepared on the surface of 45 steel by plasma spray welding in back feeding method. The dissolution of Ni-based WC composite coatings was investigated. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy diffraction spectrum (EDS) were used to examine the microstructure and composition of the coatings. The results show that the WC particles are well-distributed in the matrix. The WC particles have a good wettability with Ni-based substrate. In the spraying process, the WC particles have been dissolved obviously, and the diffusion occurs between the WC particles and Ni-based substrate. The surface of the coatings has a microstructure consisting of WC, W2C, Fe7C3, Cr7C3 and γ- (Fe, Ni) solid solution. The hardness increases from the matrix to the surface of coatings and is up to 2311 HV.
The Research on Thermal Residual Stress of SiCp/Al Composites
Authors: Zou Jin , Zhang Jian Yun , Lu De Ping , Zhai Qi Jie
Published: January 2014

SiCp/Al composites would produce a large thermal residual stresses field during cooling process. The thermal residual stress has a greater impact to the composites dimension stability and the accuracy of application. In this paper, the thermal residual stress in SiCp/A356 composites was measured by X-ray diffraction and simulated by finite element method (FEM), the influence of particle shapes and cooling rates are considered, the stress field contour nephogram and stress-time curve during cooling was simulated. The studies present residual stress formed during cooling process because of the difference of thermal expansion coefficient (CTE) between SiC particle and aluminum alloy, the maximum stress distributes near the interface of matrix/SiCp mainly. The stress-time curves are inconsistent under different cooling rates, the higher cooling rate, the more dramatic variety in stress.
Effects of La2O3 on Microstructure and Wear Properties of Thermal Clad NiCoW/ La2O3 Composite Coatings
Authors: Liang Bu Nv , Zhang Zhen Yu
Published: January 2014

NiCoW alloy powders with and without 0. 4 % La2O3were flame spray welded onto 1045 carbon steel substrate. Vickers microhardness profiles of the coatings were carried out. Sliding wear tests in dry conditions were carried out by means of weight-loss method for several applications in oil industries. For this purpose, Ni-based alloy and high chrome cast iron were used as compared materials. A scanning electron microscope (SEM) was used to analyze the wear phenomena of samples. The result showed that the hardness of the coatings can be improved by addition of 0. 4 % La2O3, and the anti-adhesion, anti-scratching, and plastic deformation resistance abilities of coatings are increased with the addition of La2O3.
Effect of Niobium on the Morphology of Nodular Graphite in Ductile Iron
Authors: Yan Yong Sheng , Chang Liang , Chen Xiang Ru , Hua Qin , Zhai Qi Jie
Published: January 2014

This paper mainly studied the effect of niobium on graphite which was quantitatively analyzed by the image analysis software. The results showed that with the amount of niobium increasing the number of nodular graphite and the percent of spheroidization in ductile iron were reduced whereas the size of nodular graphite was increased.
The Residual Stress after High Frequency Induction Welding with Complex Shapes WC-Co Alloy and Steel
Authors: Ju Jia , Xue Feng , Zhou Jian , Bai Jing
Published: January 2014

Residual stresses were investigation by Three-D finite element simulation and experimental method. The Three-D finite element simulation confirms large residual stress appears in seam zone because of the crack part and the maximum loading parts were not coinciding. The heating/cooling rate can seriously affect the residual stress. Along with the heating rate decrease, the residual stress reduces in material and had big drop in high heating rate range than lower range. And cooling rate influence the residual stress in cemented carbide was more sensitive than in steel. Meanwhile, far away the seam, the residual stress decrease and became stable. After heat treatment, the residual stress reduced from more than 800MPa, 300MPa to less 100MPa, 52Mpa in WC-Co side and steel side respectively and the material had better abrasion resistance and high strength.
Interface Microstructure and Properties of 304 Austenite Stainless Steel/Low Carbon Steel Clad Plate by Casting and Hot Rolling Process
Authors: Li Shuo , Tang Di , Wu Hui Bin , Xiong Ji Guang
Published: January 2014

The 304 austenite stainless steel and low carbon steel clad plate was fabricated by casting and hot rolling process. The mechanical properties and interface shear strength of clad plates with different thickness after rolling were investigated in detail. The microstructure characteristics of the clad interface were observed by SEM (Scanning Electron Microscope). The phases and chemical composition were analyzed by XRD (X-ray diffraction) and EDS (energy dispersive spectroscopy). Based on the results, the mechanical properties and interface shear strengths meet the requirements of national standards. No visible cracks were observed in the clad interface after bending test. Cr3C2precipitates, Fe3O4oxides and Fe-Cr intermetallic compound were distributed around the interface of clad plate after casting, but a good metallurgical bonding was achieved after hot-rolling.
First-Principle Study of Atomic Structures of Fe/TMC (TM=Ti, Zr and Hf) Interface
Authors: Li Jin Chun , Shen Jiang , Wang Jan Wei
Published: January 2014

Interfacial atomic structure of iron and transitional metal carbides interface systems were investigated by first-principle method. Meanwhile, free surfaces of iron and transition metal carbides were also researched, and systematically analyzed the differences of atomic moving behaviors of two interfacial systems. These calculations indicated that the atomic movements of transitional metal carbides were lesser than softer iron matrix in these interfacial systems.
First-Principles Study of the Mechanical Properties of ScAl Microalloyed by 4d-Transition Metals
Authors: Huang Shuo , Zhang Chuan Hui , Li Rui Zi , Sun Jing , Shen Jiang
Published: January 2014

The structural and elastic properties of B2 ScAl doped with Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag and Cd elements are studied by using first-principles calculations. The calculated elastic coefficients of pure ScAl are consistent with other theoretical results. The results of elastic constants indicate that all the ScAl-based alloys discussed are mechanically stable. The bulk modulusB, shear modulusG, Youngs modulusY, Pugh ratioB/Gand Cauchy pressure (C12-C44) are investigated. It is found that the addition of Ru that prefers Al site in ScAl can increase the stiffness of ScAl and improve its ductility.
Tribological Properties of FeNiCr Coatings with the Addition of La2O3 on 1045 Carbon Steel
Authors: Zhang Zhen Yu , Liang Bu Nv
Published: January 2014

FeNiCr alloy with various amount of La2O3 powders were thermal sprayed onto 1045 carbon steel substrate. Properties of sprayed coatings were studied by an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. Electron probe microscopy analysis (EPMA), X-ray photoelectron spectroscopy (XPS), were employed to this study. The results show that La2O3 can refine the microstructure effectively, and make the element distribution uniform, which leads to the improvement on the properties of the coatings. Meanwhile, the wear rate of the FeNiCr alloy with 1.5% La2O3 is smaller than other coatings. Interestingly the rare earth can reduce the friction coefficient, and act as self-lubricant in the oxide debris layer formed on the worn surface in friction. Wear mechanism of the coatings is oxidation wear and a large amount of counterpart material is transferred to the coatings.
Effect of Solution Temperature on Grain Size in a Mg-4Y-3Nd-3Dy-0.5Zr Alloy
Authors: Yi Jun Ying , Ning Zhi Liang , Yang Dian Wei , Zhang Hong Xue , Sun Hai Chao , Sun Jian Fei
Published: January 2014

The effects of solution treatment on the grain size and microstructures of an Mg-4Y-3Nd-3Nd-0.5Zr alloy were investigated. Grain size increased slowly when treated at 500 oC and 525 oC, showing that the hindering effect of eutectic phase on grain growth can be ignored. The fitting relationship equations for average grain size vs. solution timehare=49.92t0.15and=45.44t0.15, respectively. When the solution temperature was increased to 550 oC, the fine dispersion phases was dissolved gradually, leading to a rapidly increase in grain size. The fitting relationship equations for vs.his=39.69t049.The grain growth exponent n at 550 oC is far higher than those at 500 oC and 525 oC.
Preparation of Environment-Friendly Epoxidized Corn Oil as a Plasticizer
Authors: Peng Yuan Huai , Lin Hua Di
Published: January 2014

An environment-friendly plasticizer, epoxidized corn oil was prepared by the epoxidation of corn oil with peroxyacetic acid which was generated in situ from hydrogen peroxide and glacial acetic using acidic ion exchange resin modified by zinc chloride as catalyst. The product with an epoxy oxygen content of 6.40 w% and a percent conversion to oxirane of 87.67 % was obtained under the following optimized conditions: 15 % modified ion exchange resin feed relative to the weight of corn oil, the molar ratio of 1.7 to 1 with hydrogen peroxide to double bonds, 18% acetic acid feed relative to the weight of corn oil, the reaction time of 5.5 h, the temperature of 75 °C and stirring speed of 600 rpm.
Effect of Annealing Temperature on Structural and Optical Properties of (Cu, Al):ZnO Thin Film by Sol-Gel Method
Authors: Yang Ying Xiang , Shi Qing Nan , Tan Hong Lin
Published: January 2014

The (Cu,Al):ZnO thin films were prepared on glass substrates by sol-gel spin coating technique.The effect of annealing temperature on the structural and optical properties of the (Cu, Al):ZnO thin film was investigated by means of X-ray diffraction and UV-vis spectrophotometer. It has been found that the grain sizes, Optical band gap and the preferred orientation growth of (002) plane were decreased with annealing temperature. the annealing temperature also played a significant role in the blue-shifted phenomenon.
Adaptive USB Fast Charger Design Based on Quick Charge 2.0 Protocol
Authors: Cai Hong Zhuan , Liu Yong
Published: January 2014

This paper introduces the working principle of adaptive USB fast charging based on Quick Charge 2.0 protocol, and introduces in detail wall plug charger interface chip CHY100 with supporting this kind of protocol. CHY100 integrates all the necessary elements, can add Quick Charge 2.0 platform features to the AC-DC wall plug charger.
Design and Simulation of the Hydraulic Loading Control System of the Rolling Bearing Fatigue Life Testing Machine
Authors: Guo W.Y. , Wu Ming Yu
Published: January 2014

With the continuous expansion of China's bearing industry, rolling bearing life testing machine is becoming increasingly important in the enterprises. Due to its high cost and the complexity of controlling, it is relatively difficult to develop them. Therefore in the medium and small enterprises they are seldom used. In the present study we improve the hydraulic loading control system of the ABLT-5A rolling bearing life testing machine. In addition, we apply mathematical modeling for the control system and simulation analysis by MatLab software, in order to spread and promote the rolling bearing life testing machine in the medium and small enterprises, especially to conduct corresponding researches on the control precision and stability of the hydraulic loading control system.
A Robust Adaptive Sliding Mode Control Method for Attitude Control of the Quad-Rotor
Authors: Gao Yong , Song Zhao Qing , Liu Xiao
Published: January 2014

Quad-rotor is a multi-variable and strong coupling system which has nonlinear and uncertainties. According to the quad-rotor, a dynamic model of attitude which included uncertainty parameters and unknown disturbances was established. The tracking error state was used to design a slide mode surface, and a Lyapunov function which includes slide mode surface and unknown parameter was built. Further more, a robust adaptive control law was designed. At last, the designed control law was simulated, and the results justify the feasibility of the proposed control law.
Prediction of Cutting Force in Trochoidal Milling Based on Radial Depth of Cut
Authors: Zhang Xing Hong , Peng Fang Yu , Qiu Feng , Yan Rong , Li Bin
Published: January 2014

This paper proposes an approach to predict cutting force of trochoidal milling based on radial depth of cut in order to study the mechanics of trochoidal milling. The tool entry angle and exit angle can be easily achieved to get the cutting force infinitesimals via the radial depth of cut. Through coordinate transformation, a time domain analytical model of cutting force is introduced. Subsequently, a corresponding experiment was done to measure the actual cutting force. Compared with the actual measurement data, the theoretical model is verified to be valid.
Dynamic Analysis of Bionic Vibration Isolation Platform Based on Viscoelastic Materials
Authors: Lv Hong Qing , Tang Wei Xiao , Song Qing Hua
Published: January 2014

The ecological structures of some organisms that could resist environmental vibration naturally (such as dragonfly, woodpecker and legs of cursorial animals) uncovered by biologists inspire people a new approach to overcome the above problem. In this paper, a new shock isolation system consisting of a pedestal, a rubber layer, an air spring and a shearing viscoelastic damper is designed, fabricated, and characterized to avoid the performance deterioration and physical damage of mechanical manufacturing devices from external mechanical excitations. The nonlinear dynamics model of the platform is developed and the dynamic characteristics are analyzed using numerical analysis. The displacement and velocity response are obtained. The results demonstrate that the stiffness and damping characteristic of the platform change with excitation frequency. The vibration isolation effectiveness will be greatly enhanced.
Experimental Study on the Impact of Cutting Speed on Surface Integrity of Ti-10V-2Fe-3Al
Authors: Yang Hou Chuan , Chen Zhi Tong , Chen Ming Hua
Published: January 2014

Titanium Alloy Ti-1023 is widely utilized in aerospace industry; the integrity of the parts machining surfaces is of critical importance for aerospace industry. Surface roughness, microstructure and microhardness variations were investigated on a CNC machining at different cutting speeds. Experiments results showed machined surface integrity of Ti-1023was sensitive to cutting speed. The roughness of machined surface raised with increase of the cutting speed from 40 m/min to 100 m/min, but decreased while the cutting speed increase from 100 m/min to 300 m/min. It can also draw the conclusion that no significant phase transformation, no obvious deformation and no white layer on subsurface microstructure can be observed. As for microhardness, it can also be seen that the machined workpiece surface was not seriously hardened, less than 35μm depth of work hardening at different cutting speed.
Experimental Study on Impact Damper with Activated Carbon Fine Particles
Authors: Du Yan Chen , Wu Xiao Le , Liu Zhe , Zhou Yan Yu
Published: January 2014

The activated carbon fine particles, as damping agents, are filled into the impact damper. With experimental method, the performance of the fine particles impact damper to the main system is compared with the multi-unit impact damper. The results indicate that the damping effect of the impact damper with activated carbon fine particles is not better than that of the multi-unit impact damper, but it has a much better effect to restrain the strong nonlinear of response than the multi-unit impact damper. In a certain resonance region, there is an optimum particle filled rate to the fine impact damper.
Experimental Research on the Preparation of Heat-Resistant Concrete Using Normal Portland Cement
Authors: Hu Jing You , Xie Jian Bin , Qian Shan Guang , Huang Jian Feng
Published: January 2014

Based on the heat-resistant mechanism, the orthogonal experimental method and the requirements for physical-mechanical performances of heat-resistant concrete, one mixing process project was taken as the target for analysis on the mixture ratio design of heat-resistant concrete. The conventional raw materials such as normal Portland cement, common crushed aggregates, fly ash and concrete admixture were adopted to manufacture the C30 heat-resistant concrete which gets the limit heat-resistant temperature of 500°C subsequently. And the influencing factors on the strength of heat-resistant concrete were also studied in this paper. Experimental results show that the mixture ratio design of heat-resistant concrete in this paper is reasonable. The engineering application results also show it is financially viable that adopting the normal Portland cement to manufacture the heat-resistant concrete with limit heat-resistant temperature of 500°C.
The Research of Hydraulic Characteristics of High Water Cut Crude Oil Pipeline in Sabei Oilfield
Authors: Guo Xiao Qian , Zhang Xiao Ran , Zhao Jian , Sun Chao
Published: January 2014

Based on a large number of actual production data, the paper researches the hydraulic characteristics of high water cut crude oil pipeline in Sabei Oilfield and summarizes change rules of Hydraulic friction coefficient and Reynolds number of high water cut crude oil pipeline under different flow states. After making correction model of Hydraulic friction coefficient at different flow states and using the optimization technique to determine the coefficient in the model, based on C++ builder programming platform developed the software of pipeline hydraulic friction coefficient of correction. The results calculated from the software show that the correction model can significantly reduce the pipeline hydraulic calculation errors which are declined from more than 20% to less than 5%.
The Motion Attitude Analysis of High-Speed Tracked Vehicle Climbing over Vertical Wall
Authors: Chen Ning , Han Yun Peng , Liu Pei Pei , Yang Shuai
Published: January 2014

The research object is the motion attitude of the high-speed tracked vehicles climbing over the vertical wall. The new calculation method is used in calculating certain parameters of the equation and establishing the equation of driving characteristics. The changing equations of the pitch angle and roll angle when the high-speed tracked vehicles crossing the obstacles can be obtained. The analysis results show that the motion attitude when the high-speed tracked vehicles crossing the obstacles is related to the terrain parameters, the tracked vehicle parameters, the initial velocity when crossing the obstacles, and the motion attitude can be expressed by the mathematics equations. These results provide the research-based and the theory support for the modal and analysis of the high-speed tracked vehicles crossing over the obstacles, which have high practical value.
Research of Sled Motorcycle Model Design
Authors: Du Qiu Lei , Jiang Xiao Wei , Pan Li Ai
Published: January 2014

Sled motorcycle model design is a comprehensive design gathering mechanical engineering, ergonomics, aerodynamics and color design. This paper analyzed the design in detail from the perspectives of ergonomics, aerodynamics and color design, and researched the significance of products using functions and spiritual aesthetics.
Study on the Numerical Simulation of Fillet Radius of V-Shaped Anvil Edge Influencing Quality of TC4 Heavy Long-Axis Forgings in Squaring Process
Authors: Wu Yu Zhong , Huang Fang , Liu Qian
Published: January 2014

An entire forging process for heavy long-axis forgings was divided into three steps：squaring, stretching, chamfering and rounding. Researches of forging process are now focused on the optimization of stretching, but the effect of squaring or chamfering and rounding on the forging quality is neglected. This article is in view of the problems that titanium alloy heavy long-axis forgings were prone to crack and forging process parameters were not easy to control in squaring. Using the Deform software, from strain, damage, forging required load it analyzed that the fillet radius of V-shaped anvil edge influenced quality of titanium alloy heavy long-axis forgings of different diameters in squaring, then we concluded the best combination between diameter of titanium alloy heavy long-axis forgings and fillet radius of V-shaped anvil edge. It provides basis for improving the quality of this kind of forging in squaring.
Electric Film Based on the Design of the New Electrothermal Furnace
Authors: Song Yi Ning , E Shi Ju , Sheng Ze Hong , Zhang Qiang , Shen Feng Liang
Published: January 2014

New semiconductor electric film has many advantages, such as the uniform film surface, long life, no inductance, high thermal efficiency, etc. Especially its wide voltage range, AC and DC characteristics of efficient use of available,can be direct coupling with solar, wind and other energy.Thereby reducing the use of sustainable energys cost here.In this paper, we design a new type of energy-saving electrothermal furnace which take a semiconductor electric film as the electric heating element,and well try to explore the application of this new type of electric materials.
Innovative of the Clean Trolley Based on Autodesk Inventor Professional
Authors: Yao Tian Chang , Yin Yan Chao , Cai Jia Cheng , Xu Da Wei
Published: January 2014

From analysis and design,it concluded that innovation was the key to promoting the development of product design.The scheme of the clean trolley functional innovative design was proposed in this paper, which includes the transmission mechanism, sweeping brush mechanism and Sprinkling mechanism.In design processing,the 3-dimensional model of clean trolley was established and the motion simulation analysis was also presented.The results showed that the presented scheme satisfy the design requirements and have the better performance.
Influence of Wire Grid on the Cone Calorimeter Results of Textile Fabrics
Authors: Mao Bing He , Luo Sheng Li , Zhang Hai Liang , Zhan Zhi Cheng , Jiang Zhi Jie , Yan Yu Rong
Published: January 2014

In this article, an improved procedure based on ISO 5660-1 and ASTM E1474 was developed to ensure the effectiveness and reliability of cone calorimeter test of textile fabrics. In order to improve the instability for some easy shrinking fabrics exposed under heat in cone calorimeter test, an iron wire grid was applied to cover the top surface of polypropylene nonwovens and polyester fabrics to avoid drastic distortion caused by heating irritation. Results showed that the iron wire grid could avoid the distortion of the easy shrinking samples and stable test process, also success probability and results repeatability were also improved. A guiding effect was found during the test caused by the grid, which leaded to a better uniformity of polymer melt under the thermal or even on fire.
Study on Main Function and Key Technology of Enterprises Contingency Plan Virtual Drill System Based on Virtools
Authors: Han Yun Peng , Meng Jian Feng , Meng Jian Jun , Zhang Wei Shuai
Published: January 2014

This paper designs the contingency plan subsystems main function of cognition, tabletop derive, drill and data maintenance. Then it analyses the key technologies which include the construction of 3D scene, scene optimization, scene special efficiency, network communication and synchronization, and diffusion analysis of dangerous chemicals.
Modeling of Direct Current Atmospheric Pressure Argon Discharge in Two-Dimensional
Authors: Huang Xue Yun , Zhang Ting Ting , Zhang Xi
Published: January 2014

The finite element computational package COMSOL multiphysics were used to simulate a bar plate dc discharge in argon at atmospheric pressure. The basic plasma properties such as electron density, ion density, metastable atom density, electron temperature, electric voltage and electric field were studied. The current-voltage (I-V) characteristic of numerical model is in good agreement well with experimental data. This model is simple and insightful as a theoretical tool for argon atmospheric pressure discharges.
Numerical Analysis on Temperature Field of Electric Connectors
Authors: Luo Yan Yan , Wen Yi , Hao Liang , Liu Xin Wei , Wang Yi Jun , Liu Lei , Yao Fang , Wang Zhen , Zheng Shu Mei
Published: January 2014

The steady-state thermal analysis models are established based on the thermal analysis of the Electric connectors. With the consideration to the internal heat conduction and the convection cooling, the three-dimensional solid model is imposed by the reasonable loads and boundary conditions and analyzed by ANSYS thermal analysis module. The numerical analysis is made on the temperature field of a certain type of Electric connectors at different environmental temperature and different working current. The simulation results are compared with the monitoring test data.
Computer Simulation of Pore-Water Pressure
Authors: Liu Tian Hua , Meng Shang Jiu
Published: January 2014

An appropriate analysis of pore pressure models under irregular loading effects is provided. the model is based on liquefaction test with the constant amplitude loading and pore pressure model, based on the accumulated principle of residual pore pressure, using the differential method: superposition method and optimization method. Using constant amplitude loading liquefied test, and artificial modulation irregular load liquefied test and earthquake wave input dynamic triaxial liquefied test on model, the system has been tested, the result displayed: (1) the model can better simulate the results of constant amplitude loading liquefied test; (2) the model can better describe the trend on artificial modulation irregular load liquefied test results (3) the model can describe pore-pressure growth law under earthquake wave, and also can better analysis on differential pore-pressure under different type of earthquake wave (4) the model has less parameters, can analysis of pore-pressure in real time, easy to use.
A New Approach to Assemble Tolerance Analysis Based on CE/TOL
Authors: Zhang Xiu Heng , Ba Peng
Published: January 2014

Quality indicators (precision, durability, reliability) of the mechanical products are heavily depended on their tolerance to select reasonable. According to the technical requirements and the processing program of the product in whole or in parts, the parts and components can be allocated on a reasonably tolerance, and the balance can be found between the product's features and manufacturing costs. In this paper, Pro / E modeling tools are used to design parts and assembly. In the assembly process, assembly of components designed is analyzed and synthezed by the using of CE/TOL (tolerance analysis) module of Pro/E. we obtained the percentage contribution of each unit feature to the functional requirement. A percentage contribution can help designer to decide which tolerance is tighten or loosen. The application of the tolerance analysis approacch in a simple three-dimensional sample was also discussed in this paper. Results show that this approach makes manufacturing costs and the probability of excessive interference and accuracy reduce. The accuracy of the product is improved.
Chromatic Adaptation and Chromatic Adaptation Transform Issues in Color Appearance Model
Authors: Li Xiao Zhou , Liu Yu , Liu Jing Jing , Li Xue Lin , Xu Ai
Published: January 2014

Chromatic adaptation is one of the primary causes of color appearance phenomena. It is the core foundation to develop color appearance model and the chief application. Chromatic adaptation is an important step in color reproduction process and an important physiological and psychological process. The basic principles of chromatic adaptation and chromatic adaptation transform were studied in detail based on the color appearance modeling principles. And the related viewing conditions were also studied in this paper. The research helps to make a deeper understanding to color appearance phenomena in color reproduction and to develop and to modify the color reproduction adaptation models under different viewing conditions. It plays an important role in improving the chromatic adaptation accuracy and color reproduction quality.
The Lagrangian of Analytical Mechanics and its Application in Power System with TCSC
Authors: Yin Ting , Wang Jie , Hailati Gulizhati , Xu Fa Xi
Published: January 2014

The research and development of Hamilton system have provided an effective approach for the nonlinear analysis and stability control of power system. It also plays an important role in the control of flexible AC transmission system. The application of Lagrange analytical mechanics can improve the realization of Hamilton system and the controller design. The model of single-machine infinite-bus system with TCSC is extended to an even-order system in this paper. On the basis of self-adjoint conditions the standard form of Hamilton realization is obtained with the theory of Lagrange mechanics. By non-conservative analytical mechanics theory, the system controller is designed and Matlab programming is realized on the single-machine infinite-bus system. The simulation effects of the designed controller and general controller under three-phase grounded short-circuit faults are compared, which verifies the effectiveness of the proposed control strategy in this paper. The construction of Hamilton function and design of the controller have a broad prospect of applications.
Modelling of Mass Transport in Porous Materials: Analytical Solutions and Analysis
Authors: Miguel Antonio Ferreira
Published: January 2014

The pioneering works in the area of mass transport in porous media go back to the end of last century. The partial differential equations governing the mass and heat transfer can be solved using numerical techniques, and in this paper we solve them analytically under different boundary conditions including time-periodic boundary conditions. The nature of these solutions is discussed. Analytic solutions provide valuable physical insight and are usually easier to compute. In addition, these solutions may help to experimentally determine the parameters in a setting where both the mass and temperature gradients are present, without resorting to a simplified set of equations that govern heat and mass transfer separately.