bluuebunny/crossref_metadata_2025 huggingface dataset:
Inverse Solution and Optimal Concept Rethink from Human Operation to Industrial Redundant Manipulator
Authors: Wang Mei Ling , Luo Min Zhou , Lin Xin
Published: March 2014

More and more dual arm robots with redundant manipulator are introduced in industrial fields. Here we focus on this special structure with 7-DOF redundant manipulator, an exhibit analytical and optimal concept was proposed. The formula derivations of inverse kinematics showed that when the redundant joint angle has been obtained, the remaining six joint angles can be derived analytically, and there are eight sets of inverse solution for one giving redundant joint angle. Reversed thinking the joint movement habits, patterns, and frequency of human arm operations, an optimal concept was presented to gain a real time computational efficiency of a direct inverse solution while also achieving the purpose of application.
Guided Rocket Control System Design Based on Discrete-Time Adaptive Sliding Mode
Authors: Yang Rong Jun , Shi Yun Guo
Published: March 2014

The discrete-time adaptive sliding mode controller for spinning rockets in presence of parameter error is proposed. Considering the nonlinear characteristics for the system, input-output feedback linearization is utilized to transform the system model into two standard form subsystems. Then a discrete-time controller for guided rockets is designed based on discrete-time sliding mode control principle. In order to diminish the switch width of the discrete-time sliding mode system corresponding to parameter error, a dead-zone parameter adaptive law is designed. The stability of the uncertain closed-loop system is proved by Lyapunov theory, which make the controller have high robustness. Simulation result indicates that the proposed controller is robust with respect to large aerodynamic parametric uncertainty, and has excellent dynamic tracking performance.
Finite-Time Formation Control for Autonomous Underwater Vehicles Based on Hierarchical Leader-Follower
Authors: Wang Dong Hao , Yuan Jian , Xu Juan , Zhou Zhong Hai
Published: March 2014

Finite-time Formation control of autonomous underwater vehicles (AUVs) is investigated. Considering the different communication ranges of multiple agents, we propose a hierarchical leader-follower finite-time consensus algorithm. The multiple agents are divided into three groups that are a global leader, local leaders and followers. Leaders form their positions according to their obtained information reliability. Simulations show the effectiveness of the proposed control scheme which can form predefined formation in finite time.
Modeling and Control Research for Fuelcell Supercapacitor Hybrid Powertrain
Authors: Jin Zhen Hua , Gao Da Wei , Lu Qing Chun
Published: March 2014

Simulation research work is presented for fuel cell supercapacitor hybrid powertrain. Sub-systems of the fuel cell hybrid powertrain are modeled, simulation system is developed and load following control strategy is designed. Vehicle dynamic and fuel economy performance are investigated through simulation method and the control strategy is verified through experiments on dynamic testbed. Simulation and test result show that supercapacitor can work well for power assist and fuel economy performance is improved through brake energy recovery.
Control System Design of Air Compression Double-Bubble Foaming Machine
Authors: Li Ju Li , Gu Chen Yao , Li Ying Quan
Published: March 2014

Foaming machine is a piece of important equipment in the production process of the foam concrete. This paper designed the control system with singlechip as the core of the digital processing. The communication between the singlechip and frequency converter was realized through RS485 port and the automatic control of the working process of the air compression double-bubble foaming machine can come true. The high performance-cost ratio of the single ratio enables the system control to be economical and practical; the touchscreen interface makes it simple to use; and the multi-gear setting also is easy to adjust and control. All these improve the overall performance of the foaming machine.
The Hydraulic System of Intelligent Asphalt Disperser Based on Neural Network Internal Model Control
Authors: Zhang Yan Jun , Fang Xiao
Published: March 2014

Taking into consideration the lack of control precision of the hydraulic system of intelligent asphalt disperser, an internal model control method based on BP neural network was proposed. In this method, the ability of identification of complicated systems using neural network was combined with the feature that internal model control has low requirements on the model precision. In this way, the design of hydraulic controller of asphalt disperser can be achieved. The results show that this method has better robustness with regard to the systematic uncertainty and disturbance when compared with the PID control system, and the control effect is better, which provides a novel approach for the control of hydraulic system of intelligent asphalt disperser.
Bioreactor Substrate Feeding Control Using DO Stat Control Strategy: A Modeling and Computer Simulation Study
Authors: Gao Ling , Lin Yu Tian , Lin Hui Bin , Jia Xiao Yi , Lin Jian Qun , Lin Jian Qiang
Published: March 2014

In fermentation process, substrate concentration control is important in increasing product concentration, productivity and substrate yield so as to decrease the production cost. But, the feedback control of substrate concentration is difficult for the lack of sensor for online measurement of substrate concentration. In order to overcome above problem, dissolved oxygen (DO) stat strategy was developed for feedback control of glucose feeding in fedbatch fermentation using the abrupt increase of DO as the indicator for glucose depletion and glucose feeding. In this research, the DO stat control strategy for bioreactor control will be developed and the control process will be simulated. The simulation results indicate that the DO stat strategy is effective in glucose feeding control.
Adaptive Fuzzy Controller Design for Dynamic Positioning System
Authors: Zhao Yong Sheng , Bai Yi Ming , Wu Wen Hui
Published: March 2014

An adaptive fuzzy controller for dynamic positioning (DP) system is designed. The controller utilizes Backstepping algorithm as the adaptive law and uses a fuzzy system for approximating the disturbances and uncertainties. The proposed adaptive fuzzy controller is proven to be uniform bounded in the sense of Lyapunov. Simulation results show that DP vessel with the adaptive fuzzy controller would be more adaptive with environmental interference and ship parametric uncertainty.
Biomass Boiler Drum Water Level Control System Using Neural Networks
Authors: Kalaichelvi V. , Ganesh Ram R.K. , Karthikeyan R.
Published: March 2014

. Biomass energy transforms solar energy into chemical energy and the energy is stored in the organisms internally with the help of the photosynthesis. In the biomass boiler combustion system, the boiler drum water level is an important parameter and it is a sign to measure regardless of whether boiler steaming water system is in balance. For a nonlinear process as water level control in boilers, conventional control theory is not an appropriate choice. In this study, a neural network based predictive controller is designed and implemented through simulation in MATLAB software for biomass boilers drum water level control. Performance of neural network controller is compared with conventional PID (Proportional + Integral + Derivative) controller for boiler drum water level control system and it is observed that the neural network based approach is more efficient than conventional PID controller.
The Optimal Design of the New Tube Inside and Outside Differential Pressure Flow Meter
Authors: Xie Shuang Wei , Gao Jing Zhe , Wen Zi Tong , Fang Li De , Kong Xiang Jie , Dong Fang
Published: March 2014

Differential pressure flow meter is a kind of very promising flow measuring instrument, the application range is very wide. But aiming at the defects that the mechanical structure of all kinds of existing flow meters is complex, the throttling way disturbs the fluid greatly and the stability of differential pressure signal is insufficient, a kind of new inside and outside tube differential pressure flow meter was designed.
CO2 Fixation Using MEA and CaCl2 Aqueous Solutions
Authors: Liu Feng , Li Zhi Xin , Fu Dong
Published: March 2014

The saturated CO2 loadings in monoethanolamine (MEA) aqueous solutions at normal temperature and pressure were measured. The calcium chloride (CaCl2) aqueous solution was added into the CO2 loaded MEA aqueous solution to converse the ionic form of CO2 (CO32-) to CaCO3 precipitation. The influence of the addition of CaCl2 on the CO2 fixation was illustrated.
Modeling and Simulation of Engagement Process of Antiaircraft Missile for Training Simulation
Authors: Li Ke , Liu Peng , Chen Nu
Published: March 2014

Aiming at requirements to depict engagement process of the hardware in loop simulation system of antiaircraft missile based on industrial computers for operational training simulation, the paper establishes the guidance and trajectory mathematical models for the process of antiaircraft missile attacking target. According to the result of missile velocity simulation by means of a trajectory simulation system of six degrees of freedom of an antiaircraft missile, a realistic mathematical model of the missile velocity parameter is established; a realistic mathematical model of a missile single shot kill probability (SSKP) is established with relative kill area data of a missile. The simulation model of the missile engagement process is implemented with VC++, which could be used to really simulate a whole engagement process of a missile flying and destroying a target. The experiments indicate the model is correct, the result is credible, the method is effective, and the thought solving the mentioned problem is very helpful for improving operational ability of personnel with similar training simulation system.
Aluminium Self-Piercing Rivet's Failure: Testing and Numerical Analyses
Authors: Hoang Nguyen Hieu , Langseth Magnus
Published: March 2014

In the present study, the behaviour of aluminium rivets in alloy AA7278-T6 during the riveting process when used to join two aluminium plates was investigated experimentally and numerically. It was observed by Hoang et al. that a rivet in alloy AA7278-T6 may fracture in shear when undergoing high pressure during the riveting process. A damage-based failure model was adopted for studying the shear fracture behaviour of the rivet. A calibration procedure of the damage parameters was suggested based on two tests (i.e. material tension tests and rivet compression tests). The model was implemented in the finite element code LS-DYNA as a user-defined subroutine. Numerical results showed that the model seemed to be able to capture the shear fracture mode in the rivets as observed in the tests.
Three-Dimensional Numerical Simulation of the Mechanism of Armour-Piercing Bullet Attacking on the Target
Authors: Li Qing , Chu Wen Hua
Published: March 2014

The efficiency and accuracy could not be ensured for a long time during the numerical simulation of the process of armour-piercing bullet attacking on the target, because of some extreme conditions in it, such as the detonation of high explosive and large deformation of structures. A more effective numerical model of this process is built by the three-dimensional SPH method to study the mechanism of armour-piercing bullet attacking the target. Besides, the influences of different parameters, such as the reaching velocity and angle of bullet, are investigated. It aims at providing references for the structure optimization of armour-piercing bullet and the protective design of target structures.
Effect of Material Constitution on the Properties of Thermal Insulation Materials
Authors: Liu Bo , Wang Shou De , Yang Shuai , Gong Chen Chen , Lu Ling Chao
Published: March 2014

Cement-based foam insulation board is a lightweight thermal insulation and have a characteristic of energy saving. The effects of material constitution on the properties of mechanical properties, dry densityand thermal conductivity for thermal insulation materials. The subject of fast hardening sulphoaluminate cement as cementitious materials, polystyrene particles as a lightweight thermal insulation material, adding a certain amount of water reducer, cellulose ethers, air entraining agent to make thermal insulation materials. The experimental results shows that the appropriate material constitution is following: the cement-bead ratio is 12, the ratio is 0.65, the water-cement ratio is 0.4, the content of water reducer is 0.5%, the content of cellulose ether is 0.4%, the content of the air entraining agent is 0.4% .This mix ratio test of mechanical properties are: flexural strength is 0.72MPa, compressive strength is 1.24MPa, dry density is 375kg/m3, water content is 2.3%, water absorption is 10.8%, softening coefficient is 0.95 and coefficient of thermal conductivity is 0.053 W/ (m K).
A Gas Pipeline Leakage Diagnosis of Fusing BP Neural Network Basing on WSN and D-S Theory
Authors: Liu Ping Ting , Gong Rui Kun , Gong Yu Han , Wang Chong Hao
Published: March 2014

For reasons of low accuracy of artificial survey leakage, a gas pipeline leakage diagnosis method based on BP neural networks and D-S theory is presented by introducing WSN and information fusion theory. Two sub-neural networks are established at normal node to simplify network structure. The leakage characteristic parameters of negative pressure wave and acoustic emission signals are used as input eigenvector respectively for primary diagnosis. Through making preliminary fusion result s as the basic probability assignment of evidence, the impersonal valuations are realized. Finally, all evidences are aggregated at normal and sink node respectively by using the improved combination rules. The method makes full use of redundant and complementary leakage information. Numerical example shows that the proposed improves the leakage diagnosis accuracy and decreases the recognition uncertainty.
UHF RFID Localization Based on Phase Map
Authors: Li Yan Song , Wang Dong
Published: March 2014

The Internet of Things (or IoT for short) [1] refers to uniquely identifiable objects and their virtual representations in an Internet-like structure. Nowadays, the IoT has become to the National Strategic. The basic technology of IoT is growing fast. A comprehensive real-time location system that used to tracking object in time is becoming more and more important. In this paper, a new RFID localization with passive UHF RFID-tags is presented. It is shown how persons of devices that are equipped with a RFID tag and can be tracked. The method is based on fingerprint and phase. We will find the position of the target object by two steps. First, we will calculate the first-order sub-region using SVM algorithm. Then using Dempster-Shafer theory with phase in different frequency will give us a more accurate position.
Research on Reliability Analysis Method of Industrial Control System Based on Markov Process
Authors: Wang Cheng Cheng , Liu Xiao Jing , Wang Chun Xi
Published: March 2014

With the development of industrial control systems manufacture level and reliability technology in recent years, the traditional reliability prediction methods have been unable to meet the needs of product quality. The complicated system have taken the place of traditional simple equipment, maintenance, testing and common-cause failure are becoming new problem before product designers, compared to traditional methods of reliability prediction, the method based on Markov process take maintenance and testing time, common-cause failure factors into consideration, not only make the reliability analysis results more accurate, but also proves that these factors can affect the reliability of product, which can be used as the reference for equipment production engineer to improve products.
Research on the Application of EPC Encoding Technology for Plastic Windows Manufacturing
Authors: Miao Xiang Gen , Ze Xiang Bo , Qu Yi Bing , Zhang Meng Jie
Published: March 2014

Problems with plastic windows manufacturing trade are shown in the bland signing,the lack of production equipment state data in the supply chain link,cannot accurately install productions with multi-specifications. plastic windows manufacturing system based on EPC encoding would contribute to confirm production lead time and manufacturing costs,help to accurately collect date in producing department and install of plastic windows. With the 96 bits EPC GID-96(96 bits universal identifier) coding scheme,from viewpoints of manufacturing and installment construction,designed of plastic windows coding scheme.
Using the Modified Regression Analysis to Estimate Industrial Competitiveness – The Case of Banks in Tanzania
Authors: Pastory Dickson , Qin Xue Zhi
Published: March 2014

The study aims at examining the competition trend in Tanzania using modified regression model; in general the competition was satisfactory as it depicted monopolistic competition although the large share of assets still being dominated by large banks. The study adopted panzer and Rosse model where the sum of H statistics was 0.8 greater than zero but less than one. Therefore the study recommends the banks supervision to increase the reforms to increase competition level.
Enhancing Ceramic Product Value through Appropriate Production Techniques
Authors: Enoch Olalere Folasayo , Shuaib Ab. Aziz , bin Hasbullah Abu Hassan
Published: March 2014

Launching new products is an essential attributes of successful businesses as they survive and grow; and the ability to develop these new products to compete in existing or new markets is a core competency of many successful firms. The process of developing new products begins with a well conceived design, developed into prototype. In ceramics production, the manual process of developing product idea by hand turning or hand carving design concept in plaster is slow, inaccurate and demands skilled persons that are difficult to find and too much time consuming to train; thereby, tends to decrease product competitiveness. Thus, engaging technology, by developing and conducting test digitally, and generating rapid prototype from CAD model is seen as a viable approach that can help improve product quality and get product faster to market. Therefore, this paper seeks to investigate the viability of rapid prototyping technology in enhancing product value. The paper also illustrates on how designers can integrate aesthetic appeals in product by analyzing designs using PhiMATRIXTM Software.
Study on Preparing Coating for the Anti-Erosion Property of Artillery
Authors: Wang Fei , Chen Yong Cai
Published: March 2014

To enhance anti-erosion property of artillery barrel and prolong the using period of the artillery, some new technologies are summarized and discussed in this paper, which including electric explosion spraying technology, hypersonic flame spraying technology and plasma surfacing. The experimental results show that the electric explosion spraying technology is a feasible method to prepare coating for the anti-erosion property of 100mm diameter artillery barrel.
The Influence of Heat Treatment on the Interface and Properties of Mo2FeB2 Cermets-Steel Clad Material
Authors: Peng Jun Song , Pan Ying Jun , Zhang Heng
Published: March 2014

Using B, Mo, and Fe powders as raw materials, Mo2FeB2 cermets-steel clad material has been prepared on steel 45 substrate by means of in-situ reaction vacuum and liquid phase sintering technology, and the influence of heat treatment on microstructure and properties has been studied. The influence of heat treatment on microstructure, and distribution of elements of the cladding-substrate bonding interface area has been investigated by SEM, EDS. Results show that there is an excellent metallurgic bonding between the cladding layer and steel substrate both before and after heat treatment, and heat treatment not only brings the cladding material grain size and microstructure refinement but also increases the thickness of the transition layer.
Raman Study on the Crystallization Characteristics of Amorphous Ge2Sb2Te5 Film
Authors: Zhu Z. , Liu F.R. , Huang Y.N.
Published: March 2014

Phase change materials are the basis for next generation memory devices, but the fundamental mechanism of the phase transitions has not been elucidated clearly. In this paper, the microstructure treated by isothermal and the laser radiance was compared by Raman spectroscopy. It was found that the peak ~105 cm-1 originated from GeTe4 tetrahedral structure and the intensity of this peak became weak with the enhancement of laser pulse energy and extension of annealing time. Moreover, we also ascribed the Raman peaks in specific positions to the GeTe4-nGen (n=0, 1, 2, 3) tetrahedral structures.
Study on Effect of Matrix Properties on Fatigue Damage Initiation of Woven Carbon Fabric Vinylester Composites
Authors: Shao Yong Zheng , Okubo Kazuya , Fujii Toru , Shibata Ou , Fujita Yukiko
Published: March 2014

Plain woven carbon fabric composites using different types of vinyl ester (VE) resin with different toughness have been prepared. The mechanical performances were characterized by different tests, such as tensile, tension-tension fatigue, thermoelastic stress analysis (TSA) and scanning electron microscope (SEM). The results showed that with increasing of fracture toughness of VE as well as adhesive strength between VE and carbon fiber (CF), the tensile strength improved by a range from 23.1 to 33.9%, and fatigue life of CF/VE composites increased by several times to several ten times when low toughness VE was used as control resin. The fatigue damage initiation of CF/VE composites has been investigated by thermoelastic stress analysis. It was found that the initiation and growth of fatigue damage such as matrix cracks was delayed, the linkage of matrix cracks in transverse bundles was inhibited with increasing of fracture toughness and interfacial shear strength (IFSS) of matrix resin.
The Anti-Bending Performance Study of Loaded Continuous Beam that Strengthened with Prestressed Laterally Bonded Carbon Fiber Sheets
Authors: Zeng Xiang Rong , Li Cai Ping , Chen Jin , Xie Xiao , Zhang Lei
Published: March 2014

We studied the strengthening performance of prestressed laterally bonded carbon fiber sheets (CFS) to two-span continuous beams in this paper, which included one unstrengthened beam, two non-prestressed laterally bonded CFS strengthening beams, and four prestressed laterally bonded CFS strengthening beams, and all of them were sticked with CFS on different styles on tension part of lateral beam. We discussed the stress and deformation of laterally bonded CFS strengthened continuous beams under different initial load cases and different prestressed impact, and studied the influence of initial load and prestressing to reinforcement effect. The results showed that the size of initial load and prestressing would affect the reinforcement effect of laterally bonded CFS to continuous beams; The smaller initial load, the better reinforcement effect; The reinforcement effect to continuous beams of prestressed laterally bonded CFS was better than the non-prestressed laterally bonded CFS. Corresponding to latter, the former also owned better deformation performance, less cracks number and width.
Characterization of Spray Angle and Velocity in Water-Mist Nozzle by Using Response Surface Approximation
Authors: Jeong Youn Seung , Shin Yong Wook , Seo Tae Il
Published: March 2014

This paper presented characterization of spray velocity and angle of spray nozzle systems for cosmetic products. Diameter and length of nozzle orifice were chosen as shape factors of the spray system. Combinations of the factors were determined by using Central Composite Design. Fluid analysis was conducted by using Fluent to obtain spray angle and velocity. RSM (Response Surface Method) was used to approximate the relationship between these 2 factors and spray characteristics. To evaluate the proposed method, experimental work with existing was conducted and good agreement between simulation and experimental results.
Mechanical Behavior Research of Recycled Concrete Small-Sized Hollow Block Based on Load Test
Authors: Lei Jin Song , Zhou Zhi Ping , Wang Ya Li , Wang Hong Hong
Published: March 2014

In order to study the mechanical properties of recycled concrete small-sized hollow block, some recycled concrete small hollow blocks were tested separately for mechanical behaviors. Through experimental study, the density, moisture content, anti-permeability, dry shrinkage, compressive strength and bending strength of mechanical property parameters are derived. The results show that material performance indicators of the recycled concrete small-sized hollow block meet the stipulations of the code requirement.
The Spherical Copper Nanoparticle Grown at Water-Immiscible Interface of Castor Oiled Graphite-Epoxy Solid Electrode Surface
Authors: Zhu Xiu Rong
Published: March 2014

The copper nanoparticle at castor oil coated graphite-epoxy solid electrode soft intersurface was studied by cyclic voltammetry. The growth process follows a sphere particle growth process described by an exponential function with parent first order rate constant of 0.00341 s-1. The soft water-immiscible electrode surface tends to produce spherical particles. This study may be useful for the electroanalysis, and offers a new way to prepare a spherical nanometal particle.
Multi-Response Optimization of CNC WEDM Process Parameters for Machining Titanium Alloy Ti 6AI-4V Using Response Surface Methodology (RSM)
Authors: Nandakumar C. , Mohan B.
Published: March 2014

This research deals with the multi-response optimization of CNC WEDM process parameters for machining titanium alloy Ti 6AI-4V using Response Surface Methodology (RSM) to achieve higher Material Removal Rate (MRR) and lower surface roughness (Ra). The process parameters of CNC WEDM namely pulse-on time (TON), pulse-off time (TOFF) and wire feed rate (WF) were optimized to study the responses in terms of material removal rate and surface roughness. The surface plot and the contour plots were generated between the process parameters and the responses using MINITAB software. The results show that the Response surface methodology (RSM) is a powerful tool for providing experimental diagrams and statistical-mathematical models to perform the experiments appropriately and economically.
Influence of Foaming Agent on Properties of Red Mud Lightweight Baking-Free Brick
Authors: Ma Long , Li Guo Zhong
Published: March 2014

Red mud lightweight baking-free brick was prepared by red mud, fly ash and cement, mixed with a certain amount of activator agent and foaming agent. The influence of foaming agent on properties of red mud lightweight baking-free brick was studied. The micro-structure of red mud lightweight baking-free brick was characterized by scanning electron microscopy (SEM). The results show that when the foaming agent content is 10ml, the sample with better performance obtained and the density is 423kg/m3, flexural strength is 0.49MPa and compressive strength is 1.87MPa.
Effect of Minimum Quantity Lubrication when Turning a Steel Grade
Authors: Abou-El-Hossein Khaled A.
Published: March 2014

In turning operations a coolant is usually introduced to the cutting zone to reduce the friction developed at the tool-workpiece contact area and remove heat generated because of this rubbing action. Conventionally, a coolant is introduced into the cutting zone in excessive quantities. However, a lot of concern has been raised recently as a result of the uncontrolled using of coolants in the metal cutting industry. Therefore, the concept of minimum quantity lubricant (MQL) has been introduced recently. In this paper, the principle of MQL is utilised in machining of a steel grade. The performance of MQL in terms of surface finish is evaluated against both, the flood coolant and dry cutting modes. The results obtained show that MQL produces acceptable surface finish. Therefore, it is highly recommended to consider the application of MQL instead of flood cooling when turning steel grades.
Circuit Design of High Reliability Pulse Driver for Relay Control
Authors: Jiang Yang , Peng Wu
Published: March 2014

Relay control is one of the most commonly device driver methods used in industrial control, the commonly control method is using high or low level. Short pulse jitter is extremely easy to cause misoperation of relay. This paper mainly introduces a kind of high reliability relay control method what using pulse driving source, integral circuit, selector and comparator. It can be effectively to reduce the relay misoperation, guarantee the equipment reliability in the engineering application.
The Coupling Effect of Electromagnetic Pulse and Computer
Authors: Du Gai Hong , Tian Yang Meng
Published: March 2014

Coupling characteristic of EM pulse into the computer enclose with aperture and the coupling effect of electromagnetic pulse and computer box are studied. The impact of coupling characteristic of EM pulse into the computer enclose with aperture includes the three aspects (1) the effect of hole shape on the coupling characteristics (2) the effects of the apertures area on the coupling property characteristics (3) the effects of the polarization direction of the electromagnetic pulse on the coupling characteristics; The brief overview of electromagnetic pulse coupling phenomena on the computer includes the following three aspects (1) the physical model of the computer chassis (2) the coupling coefficient of electric field in the computer box and the computer center (3) the change characteristics of the electromagnetic pulse in the computer box; Finally we discussing the preventive approach of computers electromagnetic coupling is.
Resonance Frequency Calculation of Long-Neck Cylindrical Acoustic Resonators
Authors: Li De Yu , Zheng Li Fang , Ou Li Jian
Published: March 2014

This paper presents a general model to predict resonance frequencies for long-neck cylindrical acoustic resonators. The predicted resonance frequencies by the proposed model are compared with those measured and calculated by Panton and Millers model. It is found that the model developed in this paper can give more accurate resonance frequencies for both the first and higher modes, while the Panton and Millers model can only accurately predict the first-order frequency, and up to 4% error is observed in the predicted higher-order resonance frequencies, mainly induced by the lumped-mass simplification.
Analysis of Novel OLED Based Four-Primary Displays
Authors: Deng Fei , Xiong Yan
Published: March 2014

Novel four-primary displays utilizing organic light-emitting devices (OLEDs) was analyzed theoretically and experimentally. Using the fitting curves of the OLEDs electroluminescent (EL) characteristics, RGBW four-primary display is clearly shown to be more energy efficient than traditional RGB three-primary display, especially as the efficiency of the OLEDs is getting higher.
Identification Parameters with Neural Network for Preisach Hysteresis Model
Authors: Amir Mounir , Zergoug Mourad , Amrouche Aissa
Published: March 2014

The description of hysteresis is one of the classical problems in magnetic materials. The progress in its solution determines the reliability of modeling and the quality of design of a wide range of devices, the proposed approach has been applied to model the behavior of many samples and the results show the robustness and efficiency of Neural Network to model the phenomenon of hysteresis loop. The goal of this study is to optimize the parameters of hysteresis Loop by Preisach model with the Neural Network, the method developed is based on an analysis of two distribution functions. The modified Lorentzian function and Gaussian function have been analyzed. The implemented software and performances of the distributions are presented.
Stress and Modal Analysis for Rear Axle Housing of Mining Scraper
Authors: Dong Zhi Feng , Zhang Yu Zhao , Ma Hong Li , Kuang Quan Jin , Dan Gong
Published: March 2014

The scraper is one of the important equipment in coal mine. Because of its hard working condition, the complex force and load fluctuation and vibration during the working process, some structure failures on the axle housing of scraper took place in the coal mine. The 3D models of the axle housing were built based on the engineering prototype. The structure stress of the axle housing was calculated. The mechanical characteristics were studied for further development, which included mechanical structure, the vibration modes of the axle housing, the maximum amplitudes by modal analysis. According to the result, more attention must be paid to the stress concentration, violent and irregular vibration of the axle housing in the design.
Fault Diagnosis Method of Mini Excavator Slewing Bearing
Authors: Guo Gang Tao , Duan Zhi Shan , Shi Li Chen , Zhao Li
Published: March 2014

In order to collect the fault signal of slewing bearing, design and built up the slewing bearing test rig and the signal test system. Because slewing bearing fault signal is weak, the signal containing fault characteristics was resolved and reconstructed with the wavelet theory. With the application of the Hilbert transform in demodulation and detailed spectrum analysis, the fault characteristic frequency was extracted, and the slewing bearing fault was judged. All above work shows that Wavelet analysis combined with the Hilbert analysis is effective to the diagnosis of rotary bearing local fault.
Preparation and Study on the Performance of Polymer-Modified Cement-Based Composite Insulation Materials
Authors: Li Xiao Long , Li Guo Zhong , Wang Ling , Liu Yu Zhong
Published: March 2014

In the experiment, the influence of water-cement ratio on the strength of composite material was studied, and the optimal water-cement ratio was 0.45. The influence of different dosages of foam stabilizer on the mechanical properties of composite material was studied, and the optimal dosage of foam stabilizer was 3%. And the influence of different dosages of polymer on the strength and water absorption of composite material was studied, and the optimal dosage of polymer was 1.5%. In this ratio, the compressive strength is 0.53 MPa, flexural strength is 0.39 MPa, 2h water absorption is 41.1%, 24h water absorption is 43.1% and thermal conductivity is 0.048 W/(m·K). Meanwhile, scanning electron microscopy is used to observe the internal morphology of the samples, and the related action mechanism is explored.
Research on Racing Loss of a High-Power Hydraulic Retarder
Authors: Li Hui Yuan , Ji Hai , Qin Xu Qing , Wu Chao , Wang Yun Hu
Published: March 2014

This paper aims at the requirement of tracklayer gearing controlling racing power loss (for short racing loss), analyzed mechanism of generating racing loss of a high-power hydraulic retarder. By adding different number of baffle-plate equipment, racing loss was reduced. Using CFD technology, this paper studied contrastively the racing loss of hydraulic retarder in different condition, and compared with experiment result. The result indicated that the racing loss reduced obviously after fixing baffle-plate equipment, and the CFD simulation results agree well with the experimental results.
The Study on the Variation of Friction Coefficient of Flank Lock Type Precision Locknut at the Different Tightening Speed
Authors: Chen Chih Ming , Sun Chin Huang
Published: March 2014

The study investigated the variation of friction coefficient of a vertical assembly of flank lock type precision locknut at the different tightening speed by a torque and axial force test machine. The tightening speed is set at 4rpm, 6rpm and 8rpm, respectively. The lubricant is a type of 2TML. Surface morphology was observed before and after the test via an optical microscope. The experiment proceeded to five preloads to test and took the sixth as the experimental setting through the ISO 2320 specification. The study observed the variation of friction coefficient at the different tightening speed under a preload. The results show that the friction coefficient tends to be smaller when the tightening speed becomes faster. The increase of friction coefficient associates with the increase of anti-loosening ratio. For the surface morphology, it was found that the seat surface and the thread surface of the locknut generates the reaming, scraping and fatigue damage after the repeated tightening and loosening test.
Research on Functional Similarity and Structural Similarity of Mechanical Components
Authors: Yin Jie , Wang Ai Lun
Published: March 2014

The similarity theory is in essence a method based on equation expression. In the application, the model is regarded to be similar to the prototype only if the similarity theorem can be met. But different physical objects have the same equation expression, so the model is always not similar to the prototype. To solve this problem, a new method which studies the similarity of mechanical components from the perspective of function and structure is put forward in this paper, based on the similarity theory and the ‘black box’ concept. The functional similarity criteria and structural similarity criteria derived from this method can accurately describe the similar properties of mechanical components under different similar requirements and can be used to set up the experimental model. Finally, a series of basic mechanical components are taken for example to verify the feasibility and superiority of this method. The method put forward in this paper can be applied to model test design and engineering test, etc. under different similar requirements.
Effect of Helical Screw Tape Insertion on Heat Transfer and Pressure Drop Characteristics in a Horizontal Concentric Double Tube Heat Exchanger
Authors: Kapse A.A. , Dongarwar P.R. , Gawande R.R.
Published: March 2014

In the present work, the effects of insertion of helical screw tape on heat transfer characteristics and pressure drop in a concentric double tube heat exchanger are experimentally investigated. The heat exchanger has the outer (steel) and inner (copper) tube diameters of 50 mm and 25 mm respectively. The helical screw tape of diameter 19 mm is inserted into the inner tube to increase turbulence which helped to increase the heat transfer rate. The hot water was flowed through the inner tube and cold water was flowed in annulus. The helical screw tape was inserted in 1/3rd length and full length of the tube. The experiments are based on Reynolds number at tube inlet, ranging from 10000 to 42855. The experimental results show that the average Nusselt numbers and friction factors are respectively, 1.41 and 2.08 times over the plain tube for 1/3rd length insert and 1.87 and 4.31 times over the plain tube for full length insert. Furthermore, the enhancement ratio of the helical screw tape varies between 1.03 and 1.17, 1.02 and 1.26 for 1/3rd length insert and full length insert, respectively.
Application of Taguchi Design of Experiment Method in Optimization of Izod Impact Testing
Authors: Davis Rahul
Published: March 2014

This present research work is focused on obtaining the combination of the optimal levels of the parameters notch angle, heat treatment processes & height of the hammer in order to maximize the impact value of mild steel, having 0.40 % carbon, in an izod impact test. The process evinces hammering effect on the specimen that ascertains the amount of mechanical energy required for the failure of any material. This research work investigates the effect of all the three parameters on impact values. The optimal values of the parameters were determined using design of experiment (DOE) via taguchi method with the application of used Orthogonal Array. Signal-to-noise ratio and the analysis of variance were used for the further analysis. The important findings of the experiments show that height of the hammer was the only parameter that affected the impact values significantly. The findings were followed by affirmations by performing the confirmation experiments.
Multi-Objective Structure Optimization Design on the Upper Carriage of a Naval Gun
Authors: Wang Kai , Ma Da Wei
Published: March 2014

A multi-objective structure optimization design onthe upper carriage of a naval gun was operated in order to improve both compliance and eigenfrequencies effectively. Based on SIMP (solid isotropic material penalization) method, compromise programming method was adopted to define multi-objective topology optimization. The topological structure of upper carriage was obtained through the optimization, and further, the new structure design. Results verified by FEA show that the new design can simultaneously satisfy the compliance and eigenfrequencies objective, and meanwhile candecrease mass and stress.
Anti-Slosh Effectiveness of Baffles and Braking Performance of a Partly-Filled Tank Truck
Authors: Yang Fan , Yan G. , Rakheja S.
Published: March 2014

The liquid cargo movement within a partly-filled tank truck affects its braking, roll dynamics and directional performance in an adverse manner. In this study, the braking performance of a partly-filled tank truck equipped with different baffles designs is investigated considering dynamic fluid-structure interactions. The validity of the computational fluid dynamic model is examined through laboratory tests conducted on a scale model tank with and without baffles. The measured responses to harmonic excitations revealed three-dimensional nature of the fluid motion and couplings between the lateral and longitudinal fluid slosh. Several spectral components were observed for the transient slosh forces, which could be associated with the excitation, resonance, and beat frequencies. A dynamic pitch plane model of a Tridem truck incorporating three-dimensional fluid slosh dynamics is subsequently developed to analyze the fluid-vehicle interactions under straight-line braking maneuvers. The results show that the vehicle responses are highly influenced by the slosh-induced force and moment.
Research of Agricultural Machinery Modeling Method Based on Virtual Reality
Authors: Wang Fei , Chi Rui Juan , Zhu Zhong Xiang , Mao En Rong
Published: March 2014

In order to make the virtual experiment results close to or equivalent to the real movement patterns, the agricultural machinery virtual test based on virtual reality requires realistic scene model and it also needs more accurate agricultural machinery dynamic model.As for the rice and wheat combine harvester of hydraulic steering, firstly, model transformation technology is used to convert Pro/E harvester model into three-dimensional geometric model that can be identified by Vega Prime virtual reality systems. Secondly, classical dynamics equation is used to construct the mathematical models of the rice and wheat combine harvester. Finally, mathematical models are combined with geometric models by VC++ programming, and then the physical behavioral model of combine harvester which has the physics properties is created.It can effectively strengthens the authenticity of agricultural machinery virtual test, and provides an important platform to start agricultural machinery virtual characteristics test. The modeling method can provide an important agricultural machinery dynamic model for the further virtual test based on virtual reality.
An Experimental Investigation on Transpiration Cooling for Supersonic Vehicle Nose Cone Using Porous Material
Authors: Zhao Lian Jin , Lin Jia , Wang Jian Hua , Peng Jin Long , Qu De Jun , Chen Lian Zhong
Published: March 2014

During hypersonic flight or cruise in the near space, the aerodynamic heating causes a very high temperature on the leading edge of hypersonic vehicles. Transpiration cooling has been recognized the most effective cooling technology. This paper presents an experimental investigation on transpiration cooling using liquid water as coolant for a nose cone model of hypersonic vehicles. The nose cone model consists of sintered porous material. The experiments were carried out in the Supersonic Jet Arc-heated Facility (SJAF) of China Academy of Aerospace Aerodynamics (CAAA) in Beijing. The cooling effect in the different regions of the model was analyzed, and the shock wave was exhibited. The pressure variations of the coolant injection system were continuously recorded. The aim of this work is to provide a relatively useful reference for the designers of coolant driving system in practical hypersonic vehicles.
Method of Ginkgo biloba Drying and Drying Machine Design
Authors: Hou Jun Ming , Yang De Xu , Wu Ke Jia
Published: March 2014

In this paper the drying process of ginkgo biloba is discussed. The process combined effect of convective Heat and mass transfer on hydromagnetic electrically conducting viscous, how to improve the ability of drying is an important problem. The heat transmission for drying process is discussed. The parameter of drying process is determined. The ginkgo biloba drying machine is developed and the key part of drying machine is designed. The whole drying machine is developed, which can enhance the ability of medical industry. The study can help the Optimization of drying process and the level of the ginkgo biloba drying.
Simulation Investigation about Combustion and Emission Characteristics of n-Butanol/Diesel Fuel Mixture on Diesel Engine
Authors: Wu Jian , Wang Hong Ming , Zhu Li Li , Hua Yang
Published: March 2014

In this paper, combustion process was simulated on diesel engine with n-butanol/diesel blends in 3000 r/min, 300 Nm using AVL FIRE ESE Diesel. By comparison with indicator diagram, simulation results were consistent with the test results using pure diesel and 5%(volume of n-butanol) n-butanol/diesel blends. Using the calculation model combustion in cylinder is calculated burning B10(mass friction of n-butanol is 10%), B20 and B30 n-butanol /diesel mixture. The results show that the maximum combustion pressure and temperature gradually increases, and accumulated heat of release slightly reduces with the adding of n-butanol. BSFC increases, but indicated efficiency reduces. Mass friction of soot significantly reduce, and mass friction of NOx firstly decreases then increases with the adding of n-butanol. This will provide a basis to the research of n-butanol as substitute fuel.
Viscosity of Dimethylbenzene in [Bmim][BF4] and [Bmim][PF6] Ionic Liquids
Authors: Zhu Ming , Zhu Ming Xia , Song Yu , Liang Wei Zhao , Han Wei , Chen Yi Ning
Published: March 2014

The viscosity of dimethylbenzene and imidazole ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate [Bmi [BF4] and 1-butyl-3-methylimidazolium hexafluorophosphate [Bmi [PF6]) was measured. Within the temperature range from 298.15 K to 308.15 K, the viscosity of the four binary systems decreased sharply as the raise of temperature. The viscosity values decrease slowly in the temperature range from 308.15 K to 338.15 K. The viscosity of dimethylbenzene in the ionic liquids was in sequence: [Bmi [BF4] < [Bmi [PF6]. The experimental viscosity values had been correlated using the binary parameters of Vogel-Fulcher-Tamman equation.Keywords: viscosity, dimethylbenzene, [Bmi [BF4], [Bmi [PF6]
Analytical Method for Obtaining Cut Geometry of Helical Toroidal Cutter during Semi-Finish in 5-Axis Milling
Authors: Kiswanto Gandjar , Hendriko Hendriko , Duc Emmanuel
Published: March 2014

Cut geometry data is an essential information in current machining simulation and optimization. The tool orientation changed continuously during free-form machining become a challenge in predicting cut geometry in 5-axis milling. This paper present an extended analytical method to define cut geometry during semi-finish milling. The algorithm was developed by taken into account the existence of helical angle. The developed model was successfully implemented to generate the shape and the length of cut. From the test it was found that helical angle gives significant effect to the cut geometry.