bluuebunny/crossref_metadata_2025 huggingface dataset:
Research Status and Problem Analysis on Pineapple Leaf Crushing and Returning Technology
Authors: Li Ling , Zhang Jin , Ou Zhong Qing , Cui Zhen De , Li Yu Lin , Zhang Yuan , Yang Zhong Ze
Published: December 2014

Pineapple is widely planted as one of the four major crops in in south China. The handling of residual pineapple leaves is not a step for looking down upon after harvesting. So far, returning the residual on the filed is the popular method, compared to set the residual on fire, crushing and returning has distinct advantage on high-efficient and low-pollution. In the text, the technology and machine of crushing and returning is summarized, and the current problems is analyzed and discussed.
Synthesis and Optical Properties of D-A Type Organic Molecules Based on Fluorene and Carbazole
Authors: Tang Ze Biao , Sun Xiao Xia , Zhang Pei Lin
Published: December 2014

The new compounds F2 and C2 have been successfully synthesized via the Vilsmeier-Haack reaction, which were designed to construct D-A type organic conjugated molecules composed of central fluorene and carbazole donating units and two aldehyde terminal accepting groups. Optical properties of the resulting compounds were examined by UV-vis and fluorescence spectroscopies. The fluorescence spectra of F2 and C2 both exhibiting strong emission peaks in the blue light regions, are expected to be promising pure blue materials for organic light-emitting diodes applications.
Synthesis and Optical Properties of Donor-Accepter Organic Conjugated Molecules Composed of Fluorene and Phenothiazine
Authors: Tang Ze Biao , Sun Xiao Xia , Zhang Pei Lin
Published: December 2014

Novel donor-acceptor conjugated organic molecules composed of central fluorene and phenothiazine units and aldehyde terminal groups have been designed and constructed via the Vilsmeier-Haack reaction. Optical properties of the resulting molecules were examined by UV-vis and fluorescence spectroscopies. The fluorescence spectra of the molecules in the solid state show strong emission peaks in the violet, blue, cyan and green light regions. Thus, the molecules are expected to be promising light-emitting materials for organic light-emitting diodes applications.
Synthesis of D-A Type Organic Molecules Based on Carbazole and Phenothiazine for Organic Light-Emitting Materials
Authors: Tang Ze Biao , Sun Xiao Xia , Zhang Pei Lin
Published: December 2014

Novel D-A type conjugated organic molecules composed of central carbazole and phenothiazine units and aldehyde terminal groups have been designed and constructed. Optical properties of the resulting compounds were examined by the mean of UV-vis and fluorescence spectroscopies. The fluorescence spectra of the molecule C2 based on central carbazole unit show strong emission peaks in the blue light regions, which are expected to be promising light-emitting materials for organic light-emitting diodes applications.
Resistive Switching Behavior in Pt/La0.7Sr0.3MnO3/Nb0.05Bi0.95FeO3/Nb:SrTiO3 Ferroelectric Heterostructure
Authors: Zhu Yong Dan , Hu Cheng , Zuo An You
Published: December 2014

we report reproducible resistive switching performance and relevant physical mechanism of Pt/La0.7Sr0.3MnO3/Nb0.05Bi0.95FeO3/Nb:SrTiO3 ferroelectric heterostructure which was fabricated by pulsed laser deposition. This device exhibits a nonvolatile resistive switching with a resistance ratio of up to 60 under 2V/-3V pulse voltages at room temperature. Low voltage readout, reliable resistance switching reproducibility and good time retention, indicating promise for non-destructive readout nonvolatile memories. In this metal/p-semiconductor/ferroelectric/n-semiconductor heterostructure, the mechanism of resistive switching behavior would be attributed to the ferroelectric polarization enhanced field-induced charge redistribution at the semiconductor/ferroelectric interface, resulting in the modulation of the interface barrier height. Keywords: Resistive switching, Ferroelectric resistive switching, Ferroelectric field effect.
Study on the Precipitation Sequence of Aged NCu30-4-2-1 Alloy by DSC
Authors: Ai Yun Long , Shen Xiao Rui , Chen Wei Hua , Xie Yao Hui
Published: December 2014

NCu30-4-2-1 alloy was handled by solid solution at 950°Cfor 2h and then taking aging treatment at different temperatures and holding time. The microstructural evolution of NCu30-4-2-1 alloy in the process of aging treatment was investigated by metallographic microscope, X-ray diffractometer and differential scanning calorimetry. The results show that the phases of as-cast NCu30-4-2-1 alloy is composed by dendritic α-Ni-based solid solution and β-Ni3Si. After solid solution and aging treatment, the block distribution β-Ni3Si dissolves and many small granular dispersed distribution β'-Ni3Si precipitate out. With the increase of aging temperature and holding time, metastable β' tends to transform into stable β-Ni3Si. The precipitation sequence of aged NCu30-4-2-1alloy is supersaturated solid solution of α-Ni, GP zone, β'-Ni3Si and β-Ni3Si.
Flexural Behavior of Basalt Fiber Reinforced Ferrocement Composite with Fly Ash
Authors: Chen Si , Eising Daniel , Xu De Ping
Published: December 2014

Ferrocement composite is constructed by cement mortar and reinforced buy layers of continuous and relatively small size wire mesh. The high cement usage in the mixture causes environmental and economical impacts. Basalt fiber is produced from melted basalt rock. This paper reports the experimental investigation carried out on the flexural characteristics of ferrocement composite using various kinds of basalt meshes by basalt fiber and different volume of Class F fly ash. The results clarify that the ferrocements without fly ash or with a small percentage of fly ash have a good mesh/matrix bond, leading to a better flexural behavior. The high volume of fly ash is shown to have a negative effect.
The Application of Non-Linear Optimisation Algorithm to the Simulation of Nimonic Alloy 75 at Elevated Temperature
Authors: Zeng Qing Lin , Zhan Zhi Lan
Published: December 2014

In this paper, a gradient-driven non-linear optimization algorithm has been introduced and applied in numerically simulation of a nickel-chromium alloy at elevated temperature. The Chaboche unified constitutive model has been used to describe the cyclic plasticity and viscoplasticity of this alloy. Optimisation algorithm has facilitated a step-by-step method to obtain the initial material parameters, while a non-linear least-square approach were used to obtain the optimised material parameters. Uniaxial experiments were carried to obtain the full cyclic stress-strain and stress relaxation data at 450°C. Satisfactory results have been obtained for the simulation of the transient and steady state cyclic stress-strain and stress relaxation behaviour.
Study on the Stone Material of the Chinese Official Buildings in Early Ming Dynasty (about 1368-1424)
Authors: Sun Xiao Qian , Chen Wei
Published: December 2014

The utilization of the stone material in Chinese official buildings in early Ming Dynasty was mature, and the characteristics performed at the tremendous volume in scale, the flowing lines and the plain style in decoration. This paper took the stone material used in the official buildings in the three capitals (Fengyang, Nanjing and Beijing) as the research object, analyzing the stone’s characteristics, categories and related the transport ability in early Ming Dynasty.
The Determination of Solution Temperature for NCu30-4-2-1 Alloy
Authors: Huang Si Qi , Ai Yun Long , He Wen , Shen Xiao Rui
Published: December 2014

NCu30-4-2-1 alloy was treated by the two methods of in situ observation experiment at high temperature and common heat treatment to determine solution temperature. High temperature metallurgical microscope was used to in situ observation of microstructure evolution of NCu30-4-2-1 alloy during heating process. The microstructures of the samples were observed by optical microscope. The results show that the as-cast microstructure of NCu30-4-2-1 alloy is composed by dendritic α-Ni-based solid solution and net-like (α+β) eutectics. The morphology of strengthening phase β-Ni3Si is graininess distributing on the grain boundary. The optimum solution temperature is both determined as 950°C by the two methods. The two methods of in situ observation experiment at high temperature and common heat treatment have comparability.
Effect of Chamfer Angle on the Stress Distribution in Weld-Boded Single Lap Aluminum Joint
Authors: You Min , Li Jian Li , Wang Peng , Zhao Ya Lan
Published: December 2014

The effect of the outer chamfered angle at the free end of adherend on the stress distribution in weld-bonded single lap aluminum joint was investigated using elasto-plastic finite element method (FEM). The results from the numerical simulation showed that the peak stress along the bondline at the end of lap zone decreases when the adherend is chamfered on the outside and it is decreased greatly as the chamfer angle decreased. Compared to the results from the normal joint, a 15 degree chamfer angle may be appropriate to optimize the stress distribution in the weld-bonded single lap aluminum joint.
Numerical Simulation of Tube-Plate Welding Structure with T-Shaped Sections
Authors: Han Rong , Song Yi Guo , Zhang Dian Tao , Wang Ren Fu , Zheng Yu Feng , Li Li
Published: December 2014

At present, the finite element method (FEM) is used to predict the residual stress distribution of the welding structure. A long computational time is required for the multi-pass welding structure with complex shapes. Therefore, it is necessary to develop time-effective finite element model and computational approaches. In this study, the suitable finite element model is developed to perform the thermal and mechanical analyses for obtaining residual stress data of the tube-plate welding structure with T-shaped sections. The results of the finite element analyses show that the residual stress distribution and radial, hoop and axial direction stress distribution of the welding structure.
Prediction of GMA Welding Characteristic Parameter by Artificial Neural Network System
Authors: Kim Ill Soo , Lee Ji Hye , Malekani Javad , Yarlagadda Prasad K.D.V.
Published: December 2014

Nowadays, demand for automated Gas metal arc welding (GMAW) is growing and consequently need for intelligent systems is increased to ensure the accuracy of the procedure. To date, welding pool geometry has been the most used factor in quality assessment of intelligent welding systems. But, it has recently been found that Mahalanobis Distance (MD) not only can be used for this purpose but also is more efficient. In the present paper, Artificial Neural Networks (ANN) has been used for prediction of MD parameter. However, advantages and disadvantages of other methods have been discussed. The Levenberg–Marquardt algorithm was found to be the most effective algorithm for GMAW process. It is known that the number of neurons plays an important role in optimal network design. In this work, using trial and error method, it has been found that 30 is the optimal number of neurons. The model has been investigated with different number of layers in Multilayer Perceptron (MLP) architecture and has been shown that for the aim of this work the optimal result is obtained when using MLP with one layer. Robustness of the system has been evaluated by adding noise into the input data and studying the effect of the noise in prediction capability of the network. The experiments for this study were conducted in an automated GMAW setup that was integrated with data acquisition system and prepared in a laboratory for welding of steel plate with 12 mm in thickness. The accuracy of the network was evaluated by Root Mean Squared (RMS) error between the measured and the estimated values. The low error value (about 0.008) reflects the good accuracy of the model. Also the comparison of the predicted results by ANN and the test data set showed very good agreement that reveals the predictive power of the model. Therefore, the ANN model offered in here for GMA welding process can be used effectively for prediction goals.
The Influence of Technology Head Shift Speed, Abrasive Kind and Granularity on Technology Head Vibration during Hard-to-Machine Material Cutting
Authors: Bicejova Luba , Pavlenko Slavko , Maščeník Jozef
Published: December 2014

The submitted paper deals with examining the influence of technology head shift speed, abrasive kind and granularity on AWJ technology head vibration generation during manufacturing process of hard-to-machine material Hardox 500 of various thickness. The aim of the paper is to point at an early diagnostics and elimination of unwanted sources of vibration being generated on a technology head due to technological and technical parametre changes and a following design of optimal technological parametres for AWJ technology cutting.
Finite Element Modeling of Quenching Process Coupled with Phase Transformation Effect
Authors: Sun Yu Jie , Cui Qing Chun , Shi Chun Ming , Zhang Suo Huai
Published: December 2014

This paper presents a sequential coupled thermo-metallurgical-mechanical finite element model for low alloy steel quenching which can be used to predict temperature history, evolution of microstructure, internal stress and distortion. The main efforts are to develop a series of subroutines which consider the latent heat released due to phase transformation and numerical implementation of a thermo-metallurgical-mechanical constitute equation. The effectiveness of developed computational method is confirmed by a immersion quenching. Simulations of immersion quenching demonstrate that transformation induce plasticity has significant effect of the evolution of residual stress, distortion and can not be neglected for low alloy steel during immersion quenching.
Microstructure of Laser In Situ Synthesized TiBx+TiC Reinforced Composite Coatings
Authors: Liang Jing , Wang Chao , Chen Sui Yuan , LIU C.S. , Yang Cheng Yu
Published: December 2014

B4C/TiNi mixed powders with different composition (10B4C+90TiNi and 20B4C+80TiNi in wt. %) prepasted on Ti-6Al-4V substrates were scanned by a FL-Dlight02-3000W semiconductor laser to obtain TiBx+TiC reinforced graded composite coatings. The influences of the processing parameters on the microstructure of the coatings were studied. Optimal processing parameters were obtained with laser power (P) 1700W/1900W, laser scanning speed (V) 6.67mm/s and defocus length 310mm. The microstructures and phases of the coatings were analyzed with OM, SEM and XRD respectively. Graded composite coatings with in-situ synthesis of TiC, TiB and TiB2 reinforcements in the matrix of Ti2Ni and TiNi were obtained.
The Technology Head Characteristic Frequency Reading and Research on Technology and Material Parametres Influence on AWJ Technology Manufacturing Systems Technology Head Reverberance
Authors: Bicejova Luba , Pavlenko Slavko
Published: December 2014

The paper describes a vibrations acceleration signals scanning and processing principle at technology head characteristic frequency reading during AWJ manufacturing process.
Effect of AC Magnetic Field on Solidified Structure and Mechanical Properties of Mg97Y2Cu1 Alloy
Authors: Zhang Sen , Zhou Quan , Zhang Hao
Published: December 2014

The influences of different voltage and mold temperature on solidified structure and mechanical properties of Mg97Y2Cu1 alloy reinforced by long-period ordered structure under AC magnetic field were studied. The results show that grains of Mg97Y2Cu1 alloy can be refined by AC magnetic field treatment. Macrostructure of the alloy is changed from coarsened grains to complete fine equiaxed grains. The initial dendrites are broken and and they have a tendency to break into several fragments. The second phase becomes more continuous and uniform, its volume fraction increases. When the voltage is at 0~250V, grain size of the alloy decreases firstly, then increases, and the turning point is 200V. When the mold temperature is at 20-600°C, grain size of the alloy increases grossly with the increase of the mold temperature. The change law of mechanical properties of the alloy is opposite to the change law of grain size. When the voltage is 200V, the tensile strength and elongation of the alloy are increased by up to 16% and 47%, respectively, compared with the alloy in traditional condition.
The Application of Fractal Theory in EDM Surface Strengthening TC4 Titanium Alloy
Authors: Li Min , Hu Xiao Jun , Cai Lan Rong
Published: December 2014

EDM Surface Strengthening TC4 titanium alloy is a kind of very effective surface strengthen method, and its development prospect is very considerable. The medium in the discharge process has characteristic of self-similarity, which can be well described by fractals. And the discharge channels are an important factor affecting the distribution of discharge energy. The discharge process in kerosene and mixed powder dry medium have been simulated by using fractal theory. And the actual strengthening experiment was conducted in two different medium. The results prove that trajectory characteristics based on fractal theory are basically in agreement with the experiment result of EDM Surface Strengthening TC4 titanium alloy. The fractal theory can guide the EDM surface strengthening research of TC4 titanium alloy.
Finite Element Analysis of a Steel Bracket
Authors: Chen Xiao Liang , Tian Zuan , Li Yuan Ping
Published: December 2014

With the development of the society, sheet metal filing cabinets have become popular in the office. When filing cabinets store too many paper documents, the interlayer splints often fail because of the failure of the small brackets below. The stress and deformation of brackets were studied by the theoretical method and the finite element method. Results show some small machining shape defects have little influence on the mechanical behavior of brackets. The failure reason of small brackets is not the strength, but the instability.
Plasma Gear Manufacturing Thermal Aspects
Authors: Maščeník Jozef , Pavlenko Slavko , Bicejova Luba
Published: December 2014

The goal of the submitted paper is to provide information on gear production by means of non-conventional technology to rise production effectiveness. The work is aimed to innovative methods at production of spurs by means of assisting non-conventional technology of laser, plasma and water jet cutting. On the base of an analysis of material cutting, an optimal non-conventional technology for gear manufacturing was chosen, i.e. plasma cutting. The application of the mentioned technology influences a change of the structure of the cutting surface material, which has an impact on the cutting quality and following gear manufacturing processes. The intention of the experimental research was to look for elimination of thermal impact on structure of material used for gear manufacturing.
Research on Improving Durability of the Motorcycle Brake Drum
Authors: Huang Qi , Xiang Li , He Ze Long
Published: December 2014

Now abnormal wear between brake shoe and brake drum is found easily with the bad running conditions for motorcycle. Soft tissue like ferrite and graphite in the brake drum are penetrated by the shoe fiber and falls from the surface and pushed to the inner side which causes abnormal wear. Thus material, metallographic and hardness are improved to enhance durability of the brake drum.
Study on the Magnetic Property Deterioration of Amorphous Cores
Authors: Wang Jian , Zhang Shu Lan , Fu Xiao Tong
Published: December 2014

In order to solve the problem of the magnetic property deterioration of the amorphous cores annealed under high absolute water content condition, the deterioration mechanism was studied by using the SEM and X-ray diffraction equipment. The experimental results indicate that the magnetic properties deterioration of the amorphous cores is mainly related with the oxidation of the amorphous cores. It has been found that the oxidation occurred on the surface of the annealed amorphous materials. What’s more, the oxidation formed at the defects of the amorphous materials in priority. Thus the surface quality has a major impact on the oxidation and the magnetic properties deterioration. By analysis of the possibility of the chemical reaction, it is believed that the oxidation is caused by the Fe or B reaction with H2O. With the holding time increased, the oxides size and quantity increased. To reduce the influence of the H2O in the air on the magnetic properties deterioration of the amorphous materials during heat treatment, the experiment by aerating the N2 to the heat treatment furnace was performed. The experiment result proves that the magnetic properties of the amorphous cores were improved during annealing in N2, which almost reaches the same level of the amorphous cores annealed under low absolute water content condition.
The Storage Length Evaluation of Rubber Sealing Components with Accelerated Thermal Ageing Tests
Authors: Zhou Kun , Wang Cheng Zhang , Hu Bin
Published: December 2014

Rubber sealing components are significant proportion in evaluation of the storage length for production using it. It is necessary to determine and prolong the storage life of production that evaluated the storage length of rubber sealing components accurately. Based on artificial accelerated thermal ageing tests at five levels of temperature, conclude that the storage length of silicon rubber 3S-60 sealing components would be 11.6 years at 25°C and the confidence level of 95%. Validated this conclusion with nature weathering tests results at Jiangjin exposure field in two years, artificial accelerated thermal ageing tests presented here were available. It was illuminated that the storage length evaluation of rubber sealing components should be testified by nature weathering tests results effectually.
Discussion on the Mechanism of Fe-Cr-Mo Electrodeposition
Authors: Yu Wu Xin , Zhou Shi Qian
Published: December 2014

The electrochemical behavior of Fe-Cr-Mo codeposition was investigated by using linear scanning. The deposition potential of Fe2+ shifted negatively after adding glycine and additive W, while the deposition potential of Cr3+ had no obvious change, then the purpose of codeposition was achieved. Induced codeposition occurred after adding molybdate into the solution, at last alloy coating of good appearance was obtained.
Fire Hazard Research of Wire Joint
Authors: E Da Zhi , Zhang Ming
Published: December 2014

With the presentation of a fire accident caused by wire joint, this paper reveals the theory that large contact resistance at wire joint can induce high temperature, and eventually can cause fire. Through macro-examination and metallographic analysis about the melted marks of wire joint, it clarifies the formation mechanism of the melted marks, and the corresponding preventive measures which can prevent wire fires, provide a practical and reliable scientific basis to guarantee the safe operation of house power system.
Investigation on Microstructure and Wear Resistance of the New CrWMoV High-Alloy Wear Resistant Cast Iron
Authors: Wang Zheng Ting , Gao Hong Ming
Published: December 2014

This paper mainly introduces the new CrWMoV high-alloy wear resistant cast iron prepared by the composition design, the composition proportion and the melting and pouring, and analyses its microstructure and wear resistance. Microstructures and phases of the new CrWMoV high-alloy wear resistant cast iron were analyzed by scanning electron microscopy, energy dispersive spectrometer and X-ray diffract meter. Furthermore, the Rockwell hardness, impact toughness and wear resistance of the material were also studied. The result show that the composition of the new CrWMoV high-alloy wear resistant cast iron is mainly (V, W) C particles which is synthesized in-situ and evenly distributed in the composite, as well as a small amount of (Cr, Fe) 7C3 phase and Fe-Cr phase. The average Rockwell hardness of the composite is about 64.5 HRC, the average impact toughness is 9.85 J/cm2, and the relative wear ability of the composite is about 2 times higher than the Cr15Mo2Cu which shows good wear resistance.
Wear Behavior and Microstructural Evolution during Dry Sliding Wear of AZ51 Magnesium Alloy
Authors: Wang Yuan Bo , Su Teng Fei , Yin Ming Liang , Han Xue , Li Xin Ying , Liang Ce , An Jian
Published: December 2014

Wear behavior of AZ51 magnesium alloy was studied using a pin-on-disc type wear apparatus at 20-360 N and 0.785 m/s. Wear mechanisms were determined using scanning electron microscope (SEM), including abrasion, oxidation, delamination, thermal softening and surface melting. Microstructural evolution, plastic deformation and microhardness in the subsurfaces were examined with optical microscope and hardness tester before and after mild to severe wear transition. The subsurface microstructure experienced deformation, dynamic recrystallization (DRX) and surface melting successively with increasing load. These changes in subsurface microstructure result in strain hardening and thermally-activated softening in the near-surface layers. The thermal softening originating from DRX and surface melting in subsurface is responsible for the mild to severe wear transition.
Design and Experimental Analysis of Pepper Fruit Preprocessing Machine
Authors: Zhang Yuan , Ge Chang , Li Yu Lin , Li Ming Fu , Luo Wen Yang , Tan Guang Yu
Published: December 2014

Existing pepper fruit peeling machine for peeling incomplete, improper peeling force, pit protective film damaged, lead to a high impurity rate, pit crushing, unsatisfactory color and other issues. In order to solve these problems, manufacturing pepper fruit preprocessing machine based on analysis of pepper machining process. The machine achieves pepper fruit surface damaged by differential principle, work in with pepper peeling machine to peel completely.
Effect of Segregation Purification Process on Content of Impurity Elements in High Purity Aluminum
Authors: Jia Zhi Hong , Ma Ming Ze , Xu Liang , Xie Dao Cun , Zhao Yu Tao
Published: December 2014

Because of high purity aluminum’s excellent performance in the electronics industry, it has become more and more popular. Aluminum purification technology is the key to the development of high-purity aluminum, in this paper, through self-purification equipment and directional solidification method to explore the effect of k0 to the element purification rate during the produce of high-purity aluminum. Found that when k0 is less than 1, the smaller the value is, the better the purification is.
A Cooling Vest for Construction Workers
Authors: Wu Min , Dong Joe , Zhao Andy , Tang Wai Ching , Sher William D. , Chen Guang Wei , Chen Shuo , Qin Zhi Dan , Zhou Yan , Wang Yin
Published: December 2014

Construction workers are vulnerable to heat stress, and a number of heat-related injuries and deaths have been reported. This study thus introduces a phase change material (PCM) based cooling garment designed for construction workers. The PCM cooling garment will be effective in reducing the workers body temperature and can extend their maximum tolerable time on sites.
Mathematical Simulation of Concrete Fatigue Strength under Cyclic Loading
Authors: Kashevarova Galina G. , Kurbatov Yuri E. , Sevastyanov Roman V.
Published: December 2014

The problem of forecasting the durability of structures, buildings and constructions is one of the most urgent and important tasks in building sphere. In this paper, the authors propose a mathematical model of damage accumulation for the numerical simulation of the fatigue life of concrete. The results of numerical experiments with different levels of the applied load to the model are given, the fatigue characteristics of concrete material - Wohler curve - is built. On the basis of the developed method, the algorithm for research building designs using mathematical and physical modeling is formulated.
The Study on Contact Angle of High-Speed Ball Screw
Authors: Xu Xiang Hong , Tang Wen Cheng , Wang Yan Hui
Published: December 2014

This paper aims to develop a new systematic analysis model to predict the contact angle of ball screw in high-speed condition. In order to investigate the contact angle between the ball and raceway, a proper mechanics model of ball screw should be established. Then, considering the influence of centrifugal force at high speed, the change of contact angle will be analyzed and solved. Finally, the different factors on the influence of contact angle in different locations are analyzed. This study provides the theory basis of studying kinematics of ball screw in high speed.
The Simulation and Accuracy Analysis of Sound Filed Reconstruction Based on Fourier Transform-Source Simulation Technique
Authors: Jiang Hong Hua , Wang Yu Jiang , Xiang Yu
Published: December 2014

Acoustic transform algorithm plays an important role in sound pressure reconstruction. According to a new sound pressure reconstruction of near-field acoustic holography based on Fourier transform-source simulation technique, this article through a simulation experiment with the models of Simply Supported Plate Sound Source, verify the feasibility of the method. Furthermore, in order to verify the effectiveness of this method, this paper analyzes the impact factors that affect the accuracy of the Reconstruction. And it does simulation analysis mainly from the parameters of the Virtual Source Plane, the Distance of the Holographic Measurement and the parameters of the Holographic plane. Therefore this study provided referencing basis for later study on complex field of sound pressure reconstruction based on this technology.
Experimental Research on Thermal-Vibration for Composite Trilaminated Wing Structure
Authors: Zhao Shou Gen , Wang Yue Wu , Wu Da Fang , Pu Ying , Shang Lan
Published: December 2014

The wing structures of long-range, high-speed flight vehicles bear vibration during the flying time. The high temperatures caused by aerodynamic heating can greatly change the elasticity properties of the materials in a high-speed flight vehicle, leading to an alteration in the vibration characteristics of high-speed flight vehicle structures. In this paper, the high-temperature environment test system and vibration test system were combined to conduct a thermal-vibration test for the composite trilaminated wing structure that comprised composite materials and metallic materials. The vibration characteristics of the composite trilaminated wing structure, such as natural frequency and vibration mode, were obtained in 200°C, 300 oC and 400 oC environments. The results provide an important basis for the dynamic characteristics analysis and safety and reliablity design of wing structures comprised composite materials and metallic materials under a thermal-vibration environment.
Research and Development of Rapid Design System for Modular Machine Tool Based on KBE
Authors: Zhou Lin Zhen , Gu Qi , Li Qing Zhu
Published: December 2014

This research probes into the application of knowledge based engineering (KBE), including acquision, expression and deduction of design knowledge, in rapid design system. Following the concept of modular design and in accordance with the characteristics of machine tool design, it develops a rapid design system for modular machine tool. The design flow of this system is dominantly top-down. It can inherit and reuse design knowledge and realize rapid design of modular machine tool. System development platform and development tools are introduced in this paper. The system’s efficiency and quality are illustrated by a case design.
Research on the Calculation of the Security of High Concrete Arch Dam Based on the Finite Element Method
Authors: He Jia Long , Guo Yu Han , Zhu Xi
Published: December 2014

The study on the calculation of the security of high concrete arch dam based on the finite element method will be studied and analyzed in this paper. For high concrete arch dam deformation and stability under normal water level and maximum flood level will be calculated, and the stress of each section of the dam and batholith around will be checked and analyzed, then this paper will come to the dam security conclusion finally.
Turbine Blade CNC Machining Simulation Analysis Based on MATLAB and UG
Authors: Yang Jing Na , Bai Ri Xin , Dong Li Qin , Liu Zhi Hong , Jiao Xin Jing
Published: December 2014

As a key component of turbine, the surface of turbine blade is usually designed to distorted variable cross-section surface, and the shape is very complex. This paper combines NURBS modeling theory and NC machining method, and use NC machining trajectory generation and simulation analysis by means of UG software. The results show that the method is effective for blade processing, and have a guiding role to the industrial production.
Parameterized Highway Tunnel Inner Contour Design with ObjectARX
Authors: Peng Ting , Zhang Qing Fa , Wang Xiao Ling
Published: December 2014

With the rapid development of economy, dramatic changes have taken place in the highway tunnel industry. However, there is no professional computer aided design software for tunnel design available. Designers tend to spend lots of time to completing the design work. In order to reduce the repeating work of designers, this paper focuses on how to implement parametric design of highway tunnel inner contour with ObjectARX on the platform of CAD. In order to generate inner contour of highway tunnel automatically, parameterized design method is employed. Visual C++ 2010 is chosen as development environment of the computer aided contour design software. With proper control parameters inputted, it generates inner contour of highway tunnel automatically. According to the results, it is a promising approach to improve the design work of high design.
The Small Road Surface Shot Blasting Cleaning Machine Design
Authors: Xue Chuan , Hu Ying
Published: December 2014

The design of a small road surface shot blasting cleaning machine, using the motor driven wheel blasting high-speed rotation, the pellet material (steel shot or sand) at high speed and certain Angle to throw, throw rock formed certain fan type flow, impact to the road to play the role of a blasting and removing the effect of the residue .Then, projectile and dust into the separator, separator will be tiny and dust separation, dust into the dust collector, and the projectile into the shot blasting machine to recycle. Complete road surface shot blasting cleaning machine of shot blasting machine, sand pill purification plant design. By using solid works 3D drawing software of 3D modeling and virtual assembly.
Decreasing Airflow Velocity in High Speed Hard Disk Drive by Using Spoiler
Authors: Kankaew Waranya , Tangchaichit Kiatfa , Suriyawanakul Jarupol
Published: December 2014

This research aims at presenting the airflow simulation within the high speed Hard Disk Drive by installing the device called Spoiler which helps to reduce the airflow velocity before colliding with the read/write head. Due to the high speed airflow within the hard disk drive, it directly impacts on the vibration of the read/write arm and consequently causing the damage and inaccuracy function of the read/write head. The rotational speed of the platter is specified at 20,000 rpm (round per minute). According to this study, the length of Spoiler is divided into 4 values which are 15, 20, 25 and 30 millimeters respectively. Thereafter, apply each length of the Spoiler to the commercial software called Computational Fluid Dynamic (CFD) by using K-epsilon model. The result shows that the length of Spoiler at 30 millimeters can reduce the average airflow velocity by 57.18%.
PID Control of a Parallel Vibration Isolation System Based on Pneumatic Artificial Muscle
Authors: Liu Yan Bin , Ma Jia Jia , Yin Chen Xu
Published: December 2014

In the ultra precision measuring and machining, precision measuring instruments and precision accuracy are not only related to the precision of the instrument itself, the vibration from the surrounding environment, and many other factors also determine the accuracy of the measurement and processing. In order to solve the micro-amplitude vibration and shock proof problem of high precision equipment, the article adopted the active vibration isolation technology to build the vibration isolation experiment system based on the pneumatic artificial muscle as the action, according to the characteristics of the vibration isolation system and performance requirements, The experiment was completed by using PID control algorithm. By comparing with passive control, the results show that the vibration isolation system has good broadband vibration isolation effect, in the low frequency, effect is remarkable. This study laid a foundation for further control of pneumatic muscle in isolation system.
Improved Curie Temperature of Li-Doped Lead-Free (K,Na)NbO3 Ceramics Analysis
Authors: Zhang Rui Zhu , Guo Wen Peng , Zhao Gao Lei
Published: December 2014

(K,Na)NbO3(KNN)-based lead-free piezoelectric ceramic could be fabricated by ordinary solid sintering method.This paper reported preferable properties of solid solutions (1-x)(Na0.535K0.480)NbO3-xLiNbO3 (x=0.050,0.055,0.060,0.065 and 0.070 successively) all sintered at 1060°C.The nonconservation of charge suppressed negative effects caused by evaporations of K&Na and doped Li occupied A sites in ABO3 perovskite structure lattices led to the intensification of lattice distortion.XRD result showd phase transition from coexistence of orthorhombic and tetragonal symmetry to tetragonal.Polymorphic phase boundary could be observed when 0.050≤ x≤ 0.060.Coexistence of orthorhombic and tetragonal phases brought improvements of piezoelectric coefficient d33 and electromechanical coupling factor kp,whose top values were 162 pC/N and 28.1% in this paper. Positive correlation between the Curie temperature and Li content proved that a distorted crystal lattice needed more energy to accomplish its phase transition from tetragonal to cubic than a normal one.
The Design of the Test Control System of Small Piston Aircraft Engine
Authors: Li Yun Peng , Li Wei
Published: December 2014

For the engine maintenance enterprises, the test of aeroengine test can detect the performance of the product more accurately, but the engine testing work is a weak link. Conventional piston aircraft engine test system is the simulation instrument, according to the observed by human eyes, manual way to complete data collection work, this test system is inefficient. The engine bench test automatic measurement and control and monitoring system based on computer control is the inevitable trend of its development. Data acquisition module transmits the real-time data from the engine sensor installed on the different parts to the PC through CAN bus and display on the PC. The engine test bed control system and data acquisition system simplifies the system structure and obviously improves the test level and efficiency of the system.
Analysis and Control of the Fault in the Hydraulic System of Coal-Machinery
Authors: Hou Lan Xiang , Kong Jun , Li Feng Gang , Ju Cai Xia , Xu Wei
Published: December 2014

This paper focused on the analysis of the invaders brought into the hydraulic system in the design, manufacture, installation, working and maintenance of the process and the fault caused by the invaders to the hydraulic system of coal machine . The method of reducing the invader in oil of hydraulic system and tincreasing the reliability of hydraulic system was indicated.
Quasi-Close Loop Control of NC Machine Tools
Authors: Wang Qian Qian , Feng Yi Hui , Wang Yu Lin
Published: December 2014

There are some problems existing in open loop system with stepping motor as driving motor, such as lower servo precision, without compensation for step losing of stepping motor and so on. This paper presented a new approach called quasi-close loop control. With the help of the method, the control accuracy will be similar to that of close loop system and can be obtained, and the system will have the same stability as that of open loop system. With MCS-51 single-chip microcomputer as control unit and grating scales for measuring displacement, a quasi-close loop control system was built on NC lathe. The practice shows that the quasi-close loop control system has advantages such as high control accuracy, good stability and high cost performance. It is suited to economical NC machine tools and has wide application prospects.
Design of Multi Parameter Water Quality Online Monitoring System Base on FPGA
Authors: Yang Bao Liang , Ye Jia Yong , Cheng Zheng Fu
Published: December 2014

]:With increasingly serious pollution to surrounding environment,water quality is deteriorating gradually, which on a certain level threats our daily life. In order to detect problems timely, based on FPGA, Multi Parameter Water Quality Online Monitoring System is designed, which, taking Cyclone II FPGA that supports Nios II processor as the core, is responsible for data acquisition, analysis and processing. Data communication adopts General Packet Radio Service (GPRS) to realize the data transmission from acquisition point to the monitoring center. In the analysis of the existing problems of the current water quality monitoring systems, we present the structure and working principle of this system, and then illustrate them from two aspects: hardware and software. Practice shows that the Multi Parameter Water Quality Online Monitoring system with a simple structure is steady, reliable and easy-operated in processing multi-point data acquisition and remote monitoring the whole system, and proves a widely application in the water supply plant of villages and small towns.Key words: FPGA; Water quality; Nios II; remote monitoring
Improvement of Thermal Conductivity of Silicone by Carbon Nanotube Array (CNTA)
Authors: Wu Liang Ke , Ying Ji , Chen Li Ting
Published: December 2014

In order to improve the thermal conductivity of silicone, we prepared silicone/carbon nanotube array (CNTA) composite by immersing the CNTA into silicone solution and cured at 110 °C. The thermal conductivity of silicone and silicone/CNTA composite was measured by laser flash method at 30 °C, 60 °C, 90 °C, 120 °C, which are usually the operating temperatures. It was found that the thermal conductivity of silicone/CNTA composite increased with the temperature until achieved the plateau near 90 °C. The maximum thermal conductivity of silicone/CNTA composite is 0.674 W/mK, which is 220% higher than that of neat silicone. The excellent thermal conductivity makes the composite a promising thermal interface material.
Properties of Films Characterized by Scanning Acoustic Microscope
Authors: Yan Hong Juan , Xu Chun Guang , Xiao Ding Guo , Lin Qi
Published: December 2014

The scanning acoustic microscope is used to detect the properties of films. The ultrasonic wave propagates in the films with thickness h, acoustic impedance Z2 between medium with acoustic impedance Z1. The echoes from upper and lower interfaces overlap and interfere. The echoes are transformed by FFT. The interference phenomena are observed in amplitude spectrum of echoes. The spectrum has periodic extreme values at fn, fn=nc/2h. When thickness h is known, sound velocity c2 of film can be calculated. According to the principle, the properties of films such as thickness, acoustic impendence and elastic modulus are evaluated by scanning acoustic microscopy. The experimental results are good accorded with the actual properties of specimens.
Study on Calibration and Test of Automotive Wheel Hub Detection System
Authors: Yang Xiao Dong , Men Yu Zhuo , Yu Lei , Gao Jin Gang , Yu Hai Bo
Published: December 2014

The wheel hub detection system produces error inevitably, thus it is necessary to eliminate or reduce such error so that to enhance the measurement precision. Facing the strict requirements on the precision of devices for wheel hub run-out measurement, properties, rules of emerging and contributing factors of such errors were analyzed and results showed that it was necessary to calibrate the laser ranging tester. The input-output relation was learned from the output of such ranging tester too. For non-linear errors emerged, those little errors caused by non-linear issues in actual applications shall be revised so that to reduce detection errors.
A Water-Solution Fluorescence Probe for H2O2 Based on Naphthalimide Derivative
Authors: Shen You Ming , Yang Si Meng , Xi Li Chao , Cao Wen Yan , Zhou Li Li , Yang Yao , Feng Shao Dong , Peng Xue Fen , Zhang Xiang Yang , Zhang Chun Xiang , Jin Jun Ling , Zhen Qing Yun
Published: December 2014

A water-soluble fluorescent probe was described for detecting hydrogen peroxide with the naphthalimide derived as fluorophore and boronate moiety as recognition unit. The probe was developed as a turn-on fluorescent chemosensor with fast, high selectivity and sensitivity toward H2O2 over other biological reactive oxygen species. What is more, the probe was linear response to H2O2 concentration in the range of 2.5×10−8 – 3.2×10−5 M and lower detection limit down to 12 nM (S / N = 3) was obtained.
Out-of-Plane Stability Analysis of Crane Jib with Auxiliary Bracing
Authors: Wang Teng Fei , Lan Peng , Lu Nian Li
Published: December 2014

The analysis model is built to investigate the out-of-plane stability of crane jib with auxiliary bracing. Considering the second-order effect, the analytical expression of the out-of-plane buckling characteristic equation for the crane jib with auxiliary bracing is obtained by establishing the bending deflection differential equation of jib under the instability critical state with the method of differential equation. The equilibrium equation of the cable converging point in the lateral direction is introduced to solve the differential equation besides the boundary conditions and deformation compatibility equations. With the characteristic equation, the critical compression or the critical lifting load can be easily obtained. The characteristic equation is analytically expressed and the analytical results obtained agree very well with the finite element method (FEM) results. The validity of the characteristic equation is verified.
Transient Dynamics Analysis of the Reachstacker Speader Based on ANSYS
Authors: Shu Yu Feng , Zheng Yong Feng
Published: December 2014

Reachstacker is an indispensable handling machinery, it will inevitably lead to unbalanced force at the job site. This paper does transient dynamics analysis for the spreader mechanism, which is one of the most significance key components. We get dynamic response of the spreader in lifting instant, results not only provide a reference for designers to understand the mechanical characteristics of spreader comprehensively, but also bedding for the future research.
Design of Multi-Legged Walking Machine
Authors: Meng Fan Bo , Wu Tao
Published: December 2014

It is hard for normal traffic to travel on rugged road and polluted for the environment. So a new multi-legged walking machine with double mixed power is designed. The machine is made up of several parts, including mechanic walking part with eight legs, transmission part with two gears, two electric control footboards, two power motors and a folded beach umbrella. Detailed explanation of designed idea and process for mechanic walking legs is made. Detailed explanation of transmission ratio, circuit diagram and working principle for gear transmission is made as well. It makes simulation analysis for mechanic legs by software AUTODESK INVENTOR. The result shows that moving distance and strength are satisfied and meet standard.