bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison of Prognostic Algorithms Based on PF and EKF for Estimating Remaining Useful Life of Li-Ion Batteries
Authors: Zhang Jin , Gao An Tong , Wang Wen Bing , Han Yu Sheng , Chen Rong Gang , Zhang Feng
Published: June 2014

To estimate remaining useful life (RUL) of Li-ion batteries is a key factor for correct and safe battery management, particularly for the development of Battery Management System (BMS). A lumped parameter model which integrates the non-linear open-circuit voltage, current, temperature, cycle number, and remaining capacity and other dynamic characteristics is created based on the battery electrical characteristics is presented. A particle filter (PF) algorithm which syncretizes Li-ion battery electrochemical working process is proposed according to the sequence importance of re-sampling to predict its discharge end time in single cycle time and cycle life. Besides, for comparison, a extended Kalman filter (EKF) algorithm is also proposed to estimate the RUL based on the same statistics. Simulation results show that the PF algorithm according to lumped parameter model has a better precision in estimating RUL compared with the EKF algorithm.
Forecasting Performance Comparison by Using Power Transformation between VAR and Bayesian VAR Models
Authors: Kung Syang Ke , Wang Chi Hsiu
Published: June 2014

This article is devoted to examine the performance of power transformation in VAR and Bayesian VAR (BVAR) forecasts, in comparison with log-transformation. The effect of power transformation in multivariate time series model forecasts is still untouched in the literature. We examined the U.S. macroeconomic data from 1960 to 1987 and the Taiwan’s technology industrial production from 1990 to 2000. Our results showed that the power transformation provides outperforming forecasts in both VAR and BVAR models. Moreover, the non-informative prior BAVR with power transformation is the best predictive model and is recommendable to forecasting practice.
Car Suspension Simulation and Optimization
Authors: Zhi Shu Ya , Luo Yang
Published: June 2014

In this paper analyzed and finished optimization design. Using CATIA to establish a three-dimensional model of the car front suspension parts and made assembly. To use ADAMS/CAR build the CAR front wheel of the dynamic model of the double wishbone independent suspension system. The wheel alignment parameters were made simulation analysis. To adjust the model got the best results. The simulation test results show that the optimized parameter range not only improved the kinematics characteristics of the suspension system, more in line with the actual design requirements
Research on the Optimization of the Lower Arm of WEDM Taper Machine
Authors: Qi Jing Xing , Mao Zhi Xing , Cai Chang Tao , Luo Dong Dong
Published: June 2014

Taking the lower arm of DK7725 WEDM Taper Machine as the research object, this paper uses the ANSYS Workbench collaborative simulation environment to analyze equivalent stress and deformation of the lower arm in the different working conditions, find the weak part of Lower Arm, analyze static structure of the lower arm, and improve lightweight design. According to the characteristics of Taper Machine overall structure and optimization variables, using the Design of Experiments (DOE) method, this paper combines the response surface method (RS), goal driven optimization method (GDO) with multi objective genetic algorithm optimization method (MOGA) with the candidate schemes, extractes candidates from the calculation program, insert the candidates as the design points into the whole optimization calculation. By controlling parameter allowable error, this experiments obtains the best optimal solution. The results show that if the mass of the lower arm is decreased 13.28%, the lower arm has stable dynamic performance,and get good optimization effect.
A Novel Line Segments Extraction Algorithm with Variant Constraints
Authors: He Yong Gang , Bu Xiong Zhu , Fan Mao Jun , Hu Jun
Published: June 2014

In the domain of CAM and AI, line segment extraction algorithm play an important role. In order to extract line segments in different degree of curvature and continuum, construct the flexible and variant linearization and continuum constraints by the array signal processing method. And through the setting dimension of image unit, extract line segments satisfying the constraints in different degrees. At the last some experiments on true images demonstrate the roles of flexible parameters and the efficiency of the algorithm.
An New Method for Process Decision-Making of Slot Based on Features
Authors: Jing Huai Jing , Yin Chun Hui , Zhou Qiang Jin , Tang Chun Ying
Published: June 2014

Based on the analysis of features and NC-machining process of typical slots,a rule for slot-defining is given.An algorithm for toolpaths’ generation is proposed in the paper,via automatically obtaining the driving information of slot features.On these basis,under the environment of VS2010,a feature-based NC-processing system aimed at slots is developed,by which NC program can be made automaticly.At last,a simulate-actual processing test is done.The result shows that the algorithm proposed is correct.
Longyuan Spare Parts Management System Development
Authors: Yi Li , Li Hong Tao , Peng Jin
Published: June 2014

This paper studies the design and use of spare parts and system management module, and designed a development model based on B/S architecture. System using MVC framework, using AJAX pages, data and business separation and a series of advanced technologies developed for the management of spare parts. System design mainly uses high-performance UNIX system database server and a set of easy to maintain Windows Server2003 system as an application server, middleware using open source Tomcat, database using the Oracle database, ensure the system's high availability and high cost. The function module is based on B/S model include: procurement module, inventory management module, allocation management module, quota management module statistics query module and module-based information management and system maintenance module, the system message announcement. Spare parts management system and the advantages are analyzed to prove that the system is capable of successful application.
Research status and Application Analysis of 3D Printing Technology
Authors: Ma Wan Li , Tao Feng He , Jia Chang Zhi , Yang Jian Chun
Published: June 2014

3D printing technology is one additive manufacturing technology based on the principle of material accumulation. The domestic and foreign research status is specially introduced. The main principles and features of 3D printing technology are summarized. The applications in the civilian aspect is analyzed
A MAC-Layer Network Coding Opportunity Optimization Scheme in Multi-Hop Wireless Networks
Authors: Shang Feng Jun , Geng Zhe
Published: June 2014

In order to improve the performance of multi-hop wireless network, network coding mixes multiple signals in a single channel. A coding scheme proposed previously which is called BEND is a very compelling network coding applications. While it is another way of such programs, but there is still great potential to be developed. This article, based on BEND, expands the width of the potential paths by asking more potential nodes to join so that it increases network throughput and reduces the transmission delay at the same time. It is not a right way neither in theory nor in practical application that increasing the width of the paths unlimitedly by progressive approach. So the best paths width, as well as the network parameters which affecting the paths width is discussed in the final part of this article.
Enterprise Car Service Management System Design Based on MVC Framework
Authors: Dai Yin Fei , Shao Dan
Published: June 2014

The goal of the system is to improve the efficiency of automotive service management , to make the information management standardized,and to make the statistics and scientific inquiry rapadly, thereby reducing the workload of management and human error. Using JSP technology development process, and try to use jQuery technology to make the system more attractive. Meanwhile, add the page scripting language JavaScript for the necessary information to fill in when the check, use the MVC pattern to build the overall system development framework, to ensure that the view layer and control layer separation.
Computational Experiments Applied for Space System Simulation
Authors: Tang He Ran , Wu Zheng Yu , Xue Chen , Li Zhi
Published: June 2014

Parallel systems belong to the systems science. In 2004, Fei-Yue Wang proposed parallel systems and ACP theory that artificial society for modeling, computational experiments for analysis, and parallel execution for control. This paper re-expound parallel systems theory by the characteristics of space system and build space system model using computational experiments in the ACP theory and simulate space system by HPC method.
Studying and Application of Apriori Algorithm in Analysis of Students’ Achievement
Authors: Dai Yin Fei , Zhao Yao Hong , Gu He
Published: June 2014

In recent years, with China's higher education scale is larger and larger, the college after a long-term accumulation are stored a large number of student achievement information. But to the score analysis generally remain in a simple query and statistical stage, such as statistical quality, good, pass, fail, level number and calculate average scores, the standard deviation index, and for students to obtain these results and the relationship between curriculum have correlation or not often do not understand. By using the Apriori algorithm of association rules, hundreds of students for comprehensive mining, analysis revealed some important information and reason, to work with some of the theoretical and factual basis. If the rational development and utilization of these data, find the course between the correlation effects on student outcomes. It will be on course setting and arrangement has significant meaning.
Constructing a New Mode of Teaching Demonstration Center of Experimental Teaching of Mechanics of Materials
Authors: Chen Yun Xin
Published: June 2014

By constructing a new mode of "integration of material mechanics teaching demonstration center, three levels of" experimental teaching, teaching content and teaching mode reform and innovation of the traditional, improve experiment teaching on cultivating the students' experimental ability, scientific thinking and methods, the innovation consciousness and ability in position; to be promoting one of the basic forms of teaching quality education.
Thermal Characterization of a Reinforced Elastomer
Authors: Ghezzo Fabrizia , Miao Xi Geng , Liu Ruo Peng
Published: June 2014

The effect of the presence of fillers on the thermal properties of a high performance elastomer was investigated in this work. The characterization of the specific heat capacity (Cp), the specific heat flow and the glass transition temperature of a polyurea elastomer reinforced with two different classes of fillers, i.e. short glass fibers and alumina nanoparticles, was conducted by using a differential scanning calorimeter (DSC). We present and discuss the results of the experimental characterization carried out on the reinforced material. The results are compared to those obtained by testing the pure polymer.
The Overview of the Development of Wind Energy
Authors: Zhou Xue Song , Guo Hui Min , Ma You Jie
Published: June 2014

In the field of renewable energy, wind energy has one of the best prospects in all industries. It is a kind of clean, practical, economic and environmentally friendly alternative energy. It also has the advantages of high energy converting rate, large industrial scale、high level technology and so on. Thus in recent years, the developing trend of global wind power industry is rapid, and the growth tide of China has been enhanced significantly. This paper discusses the general development of wind power. Based on the overview of the development of wind energy and combined with the current situation of wind power market, the development trends of wind turbine were discussed. It also proposed the problems which were existed in domestic wind power market.
Research Effect of Four-Quadrant Detector Detection Spot in Atmospheric Turbulence
Authors: Meng Ying , Sun An Xin , Zhang Gui Yang , Zeng Yi Nan , Wu Yu Xin , Wei Xiao Ma , Dou Cheng Lin
Published: June 2014

Movement frequency of atmospheric turbulence is varied between a few Hz to hundreds Hz. when laser is transmitted in atmospheric some characteristic will be changed by turbulence modulation. The energy distribution form and shape of spot will be varied with movement frequency of turbulence. When spot is detected by four-quadrant detector output of detector will be effect. In order to test effect of turbulence to detector and ensure output signal can be amplified and processing effectively a kind of spot detection circuit was designed in turbulent environment. Two bands amplification was used in system. The noise suppression was completed in first band and variable gain amplifier was used in second to meet require of light intensity. Testing system was set up which can research characteristic of quadrant detector in turbulence. Experiment of spot detection in field was done. Distance from transmitting to receiving is 800m and 12.5km. Conclusions have been obtained by experimental when Distance is 800m subdivision can be up to 7 in photosensitive surface. At the same time we can see that impact of turbulence on laser transmission is a combination result with modulation of high and low frequency. And ability to spot detection has been invalid in 12.5 kilometers distances because of photosensitive surface occupied by noise from impact of turbulence, which show subdivision of quadrant detector has been broken in long distance.
Monitoring Corrosion Fatigue Damage Process of LY12CZ Aluminum Alloy with and without Coating by Acoustic Emission
Authors: Chang Hong , Pang Xiao Chao , Li Zhi Jun , Tang Wei Jie , Chen Fei Ming
Published: June 2014

Corrosion fatigue (CF) of aluminum alloy is an important form of aircraft structural damage. Considering the real service conditions, it is necessary to study the effects of the coating on the CF process. The CF lifetime tests were conducted in 3.5% NaCl solution. The coating could well protect specimens before it damaged and markedly improved the resistibility of CF. According to results of S-N fatigue curves, at σmax=250MPa, real-time detection of the CF process for LY12CZ aluminum alloy with and without coating was performed using digital acoustic emission (AE) technique. Three damage modes, namely, coating damage, corrosion and crack propagation, were determined using AE parameters analysis, that is the distribution of amplitude and peak frequency.
Research on the Sealing Structure of Prestressed Wire-Wound Ultra-High Pressure Vessel
Authors: Wu Jun Fei , Lan Jun Bin , Hu Kai , Li Qing Ling
Published: June 2014

As an emerging industry, ultra-high biological processing technology enjoys great potential and vast development prospects. Design and manufacture of the pressure equipment has always been a core problem because of ultra-high pressure processing environment. The finite element analysis software ANSYS is used to analyses the working stress distribution and deformation of a combined self-sealing structure according to an ultra-high pressure vessel. The sealing situation is evaluated and the dangerous position of axial seal is calculated which has a certain guiding significance on optimal structure design of container end seal in the future.
PID Parameter Fuzzy Self-Tuning of the Motion Control System
Authors: Zeng Meng Xiong , Zhao Jin Feng , Ouyang Wen
Published: June 2014

In the motion control system, the fuzzy self-tuning of PID parameter is the combination of fuzzy control strategy and traditional PID control, and it is an effective method to improve the control precision. The paper discussed the principle of fuzzy self-adapted PID controller and the parameter fuzzy adjustment, and it realized self-tuning online of PID parameter for the motion control system by using a fuzzy inference method, and the controller was simulated in application of motion control system under the environment of Matlab/Simulink. The simulation result indicated the self-adaptive PID controller enable the motion control system to achieve the satisfied effect.
Top Charging Car Automatic Control System Based on PLC
Authors: Zhang Chuan Wei , Hu Guang Fan , Qu Xiang Chao , Zhang Li Ping
Published: June 2014

In view of the furnace top charging car ore bin automatic distributing problems, This article puts forward a kind of high reliability, stable performance of automatic material distributing control system ,The system uses wireless communication technology、Ore bin material level detection technology and High reliability of PLC control technology, Achieving material distributing car accords to the need of ore bin for charging, Making material distributing more rational and effective, reduce labor intensity and improve the level of automation for production.`
A Design of Warehouse Monitoring System Based on Virtual Instrument
Authors: Yu Hai Long , Wei Xian Jie
Published: June 2014

In this paper, based on the design of the monitoring system, it has been demonstrated that the channel and the type of hardware, the sampling speed, precision and bus standard requirements. Through the PCI-6023E hardware design and simulation design of warehouse monitoring system by virtual instrument,it proves the feasibility of the method. This design will be a positive guiding significance for the future design of monitoring warehouse.
Research on Image Guided Missile Attack Mode
Authors: Zhu Jing Ju , Jiang Zeng Liang , Wei Xian Jie
Published: June 2014

The guidance system model of an image guided missile is established in this paper. By the simulation of Before Launch Locked and After Launch Locked modes, it has been concluded that the guidance process of before launch locked is better ideal, after launch locked mode is easy to be influenced by the seeker’s target acquisition, shooter locking target time and etc. Simulation results show that it is more favorable for the shooter to hit the target precisely by early detecting and locking the target
Design and Research of an Accelerated Device that Can Change Transient Response Performance of Vehicle Diesel Engine
Authors: Wei Zhen Biao , Zheng Kun Peng , Feng Jian Tao
Published: June 2014

The accelerated performance of the vehicle is an important part of the vehicle performance. To a large extent, the accelerated performance depends mainly on transient response performance of diesel engine. Better the transient response performance of the diesel engine, the accelerated performance of the vehicle is better. On the basis of analyzing poor performance of transient response of turbocharged diesel engine, we propose technical measures to improve accelerated performance of turbocharger using vehicle energy reserves, and design the related hardware and software. Through the real vehicle tests can show that the accelerated device can improve the transient response performance of vehicle diesel engines.
Research of Urban Intersections Group Scoping Based on Simulation
Authors: Wang Shuo , Han Xiao , Wang Qian
Published: June 2014

An urban intersection group consists of a set of intersections which are geographically adjacent and strongly correlated with each other. It is an effective way to relieve traffic congestion in the networks to set the key intersection of the road network as the core, radiate outward to find the scale of its influence and divide the intersections into groups according to their relevance. Determining intersections group is the fundament of improving traffic control. Therefore, analyzing the associated features of intersections group and the research method of determining the scope of intersection group to ensure the compatibility of "time", " space" and "traffic flow", is of high research value and practical significance[1]. This paper focuses on operating characteristics of adjacent intersections with factor (CF) as indicators of the value of the associated metric of the adjacent sections and developing dynamic partitioning intersection group program in VISSIM, and take the road network near Guangzhou Road as example.
Preparation of Powder Metallurgy Ti-47Al-2Cr-2Nb-0.15B
Authors: Wu Jie , Xu Lei , Cui Yu You , Yang Rui
Published: June 2014

Pre-alloyed powder of Ti-47Al-2Cr-2Nb-0.15B was prepared by a gas atomization process and powder metallurgy (PM) γ-TiAl alloys were made through a hot isostatic pressing route. The atomized powders were canned in mild steel and CP-Ti containers, degassed and sealed. The selection of mild steel and CP-Ti on the microstructure of HIPed γ-TiAl alloy was studied. Due to the reaction between mild steel containers and γ-TiAl at relative high temperature (over 1230oC), the γ-TiAl matrix is contaminated. Fully dense compact with CP-Ti container can be obtained by HIPing with suitable parameters of temperature.
Effects of Porosity and Re-HIP on Properties of Ti-6Al-4V Alloy from Atomized Powder
Authors: Guo Rui Peng , Xu Lei , Lei Jia Feng , Yang Rui
Published: June 2014

Ti-6Al-4V alloys of various densities were prepared by powder metallurgy (PM) using hot isostatic pressing (HIPing). The effects of porosity on mechanical properties of PM compacts have been investigated. It indicated that PM Ti-6Al-4V alloy exhibited a better performance by increase of relative density, especially for the tensile strength at 400 oC. Re-HIPing was used to assess the possibility for increasing the relative density of PM compacts with porosity defects in the first HIPing cycles. The results show that re-HIPing is an effective technique to heal porosity defects. The relative density of PM compacts with porosity can be significantly improved by re-HIPing.
Industrial Test of HAT6065 Cyanide Leaching Stirring Tank
Authors: Feng Tian Ran , Han Zhi Bin , Dong Gan Guo
Published: June 2014

HAT type cyanide leaching stirring tank increases gas-liquid mass transfer area to increase leaching speed through changing inflation mode. This article introduces the industrial experiment study situation of HAT6065 cyanide leaching stirring tank with the results show that slurry stirred and suspended evenly without delamination, which can adapt to the condition of high concentration of sulfur, iron and arsenic elements. The leaching rate of HAT6065 cyanide leaching stirring tank is about 6.61% higher than that of conventional cyanide stirring tank.
Morphology Characterization of Expanded Graphite by Ball-Milling and Subsequently Annealing
Authors: Wang Hua , Yue Xue Qing , Tan Xiao Lu , Liu Ming Ling
Published: June 2014

Expanded graphite (EG) was ball-milled for 80 h in a high-energy mill (planetary-type) under an air atmosphere and subsequently annealed at 1000 ℃ for 4 h under a vacuum atmosphere. The products were characterized by scanning electron microscopy (SEM). The results show that ball-milling EG produces nanoporous graphite powders. However, the nano-pores are hardly observed in the ball-milled and subsequently annealed EG powders.
Structural Evolution of Natural Flake Graphite during Intercalation and Exfoliation
Authors: Liu Zhi Guo
Published: June 2014

In order to investigate the structural evolution of natural flake graphite during intercalation and exfoliation, natural graphite flakes were treated by intercalating, water-washing, drying and expanding. The corresponding products, graphite intercalation compound (GIC), residue GIC (expandable graphite) and expanded graphite were characterized by X-ray diffraction (XRD). The results can provide reference for the research in this field.
Nanostructure Evolution Evolution of Expanded Graphite during High-Energy Ball-Milling and Subsequently Annealing
Authors: Liu Zhi Guo
Published: June 2014

Expanded graphite (EG) was ball-milled in a high-energy mill (planetary-type) under an air atmosphere and subsequently annealed under a vacuum atmosphere. The products were characterized by X-ray diffraction (XRD). The results show that the ball-milling decreases the crystallization degree of EG, however, the subsequent annealing improves the crystallization degree of the ball-milled EG.
A Design of Cooperative Vehicle Infrastructure System Based on Internet of Vehicle Technologies
Authors: Ding Zai Ming
Published: June 2014

The cooperative vehicle infrastructure system (CVIS) is currently the hot spot in the field of world transportation, but also the important development direction of the intelligent system of traffic in the future. This article combinations the present status of development of the cooperative vehicle infrastructure system (CVIS) at home and abroad, faces the application and development needs of the cooperative vehicle infrastructure system (CVIS), analyzes the data flow of the cooperative vehicle infrastructure system, and proposes a design of the cooperative vehicle infrastructure system (CVIS) based on the internet of vehicle, thus provides the basic reference for the design and development staff.
A Study on the Flight Data Visualization of General Aviation Based on Flightgear
Authors: Wei Lin , Xu Zhi , Ma Yu Meng , Liu Ye Lu
Published: June 2014

The development of general aviation is very rapid, but general aviation has not built the platform of flight data visualization all the time. A system of constructing the flight data visualization system based on FlightGear Simulation tool has been introduced in this paper. It contained using VC++ exploitation platform and MFC frame. Firstly the file of flight data was processed by XML configuration document. And then the Data were read by opening documents in FlightGear simulation to recreation and the same time the instrument would receive the data from FlightGear simulation with network in order to synchronously display flight data. The experiment proves that the system has good simulation effectiveness and real-time performance.
Research on Simulation of Virtual NC Lathe Machining Process
Authors: Zhou Li Bo , Xu Fu Lin , Shen Zhi Xiong
Published: June 2014

Virtual NC lathe machining simulation system is carried out with Visual C++ and Open Inventor software. The system possesses visible UI, interactive inputting workpiece and machining parameters, the integration of geometric simulation and physical simulation, all the simulation functions including real-time display machining process, tool moving, workpiece geometry shape change, the generation and movement of iron simulation, workpiece pressure shape change could be realized. Tool temperature analysis and stress & strain analysis are simulated in the cutting process by FEM. The simulation results show the high efficiency of the simulation algorithm, reasonable simulation results, lifelike. The practice and training could be replaced by the virtual one. The system is applied to verification of NC code, quality evaluation of machine operators, operators, CNC programming staff training and other functions.
Dynamic Analysis Subject to Displacement Harmonic Excitation of Liquid Storage Tank with 20000m3
Authors: Zhang Guang Hao , Huo Ping , Chen Li Wen
Published: June 2014

The isolation storage tank with 20000m3 responded to seismic is calculated by using the finite element analysis (FEA) program ANSYS, and horizontal displacement harmonic excitation is considered for investigation of the relative displacement of tank wall, liquid sloshing wave height, and the stress of tank wall. The analysis show that, with isolation, the maximal relative displacement, the maximal liquid sloshing wave height, and the maximal stress of tank wall are reduced obviously compared with tank that without isolation, and as site become soft, the maximal relative displacement of the tank wall at the top and the maximal wave height increase gradually, but the maximal stress of tank wall change little.
Research of Modular Design in Disassembly
Authors: Liu Hai Yu
Published: June 2014

Design for disassembly in in the whole life cycle of products focused on product disassembly and as the goal; modular design has to face the module and function analysis for main feature, can pass through the module selection and combination of rapid formation of product series. The detachable design and modular design methods combined, AHP is introduced, put forward to face the removable modular design method and analyzes its design flow. Finally, to large lorry bottom side door of stamping die for example and analysis.
Aerodynamic Characteristics of NACA 23015 Landing Configuration with 20o Flap in Simulated Rain
Authors: Latif Shahid , Hong Zhou , Ismail Muhammad
Published: June 2014

In our numerical simulation the heavy rain effects have been studied on the aerodynamic performance of 2D cambered NACA 23015 airfoil landing configuration with 20o. We have used preprocessing software gridgen for creation of the landing configuration of the airfoil and then creating mesh around it. Fluent is used to solve the conservation equations. We have used discrete phase modeling (DPM) in Fluent to simulate the rain phenomenon in continuous phase flow by using two phase flow approach. In our study the coupling between the discrete and the continuous phase has been activated. In discrete phase model (DPM), we used the wall film model for the interaction of the continuous and discrete phase. The airfoil landing configuration exhibited significant decrease in lift and increase in drag for a given lift conditions in simulated rain. Post processing software like MATLAB, Tec plot and Origin are used to see the effects of the heavy rain and then results obtained are compared with the experimental results. Our numerical results in most of cases show similar trends with the experiments.
Control of Articulated Manipulator Model Using ATMEGA16
Authors: Malinowski Tomasz , Mikolajczyk Tadeusz , Olaru Adrian
Published: June 2014

The paper presents a model for the construction of an articulated manipulator with 3 degrees of freedom (DOF). It is made from lightweight metal. To drive was used the stepper motors. Manipulator control system was made using a ATMEGA16 microcontroller. The control software was elaborated in BASCOM. Manipulator were tested using a manually control by joystick and in automation mode using a data file in array form. Presented solution is useful for didactics. By using more powerful motors and more complicated design it can be used to implementation in industrial conditions.
The Synthesis and Testing of a Shaped Wheel for Stairs Climbing Robot
Authors: Krys Václav , Mostýn Vladimír , Kot Tomáš
Published: June 2014

This article describes the process of designing and testing of shaped wheels for a mobile robotic stairclimbing system. It explains the basic principle of the shaped wheel and a synthesis of the shape and dimensions of the wheel segment for specified dimensions of the stairs. Before building a reduced prototype of a chassis with the designed wheels, simulations of its virtual model were performed in the ADAMS simulation environment. Functionality of the suggested solution was verified by building a prototype and its testing. The article is concluded with description of the achieved results and other research activities planned in the sphere of locomotive subsystems for stairclimbing.
Bezier Curve Based Programmed Trajectory for Coordinated Motion of Two Robots in Cartesian Space
Authors: Slota Adam
Published: June 2014

Coordinated motion of two robots in Cartesian space is considered in the paper. The goal is to generate trajectories for which change of distance between points on trajectories during motion is minimal. To minimize relative position errors along trajectories an idea of corrective motion is introduced. Trajectory coordinates are calculated as the sum of programmed and corrective motions.
To calculate the speed vector of the programmed motion at the current position, the speed at the closest point on the programmed trajectory is used. The closest point is defined as the one to which the distance from the current position is minimal or the programmed position at given time. In order to attract the generated trajectory to the programmed one a modification of the programmed speed vector is proposed. The described approach is verified in simulation. For simulation experiments programmed trajectories defined by Bezier curve segments are used. Simulations for different shapes of programmed trajectories and different programmed velocity rates are presented.
PID Control System for a Distributed Parameter Process
Authors: Ungureşan Mihaela Ligia , Mureşan Vlad
Published: June 2014

This paper presents the numerical simulation of a control system, with PID algorithm, for a process modeled through a partial differential equation of second order (PDE II.2), with respect to time (t) and to a spatial variable (p). Because these types of control systems are less usual, this paper develops a case study, with a program run on the computer. The details of using the PID control are pointed out, for an example of a system which contains a process with PDE II.2 structure.
A Comparative Study on Geometric and Kinematic Parameters of Serial (4R) and Parallel (3T) Robots
Authors: Ocnărescu Constantin , Simionescu Ion , Vulturescu Viorel , Ocnărescu Maria
Published: June 2014

A geometric and kinematic study between two structures of robots was performed, respectively a mechanical anthropomorphic structure, with bars and gears, with four degree of freedom, (dof), redundant (4R), which canavoid obstacles and a parallel manipulator with translation on three axes (3T). This 3T structural solution allows rapid and precise movements, which are important characteristics for machine building industry. All these features make the parallel manipulator to be an attractive alternative to the serial ones for high precision operations in a limited workspace.
Reduced Base Fuzzy Logic Controller for Robot Actuators
Authors: Vladareanu Victor , Schiopu Paul , Cang Shuang , Yu Hong Nian
Published: June 2014

The paper proposes an innovative type of fuzzy logic controller for robot actuators, building upon the current state of the art fuzzy architectures and various observations from work with Fuzzy Logic and Extenics Theory. This leads to a modified fuzzy controller, with a significantly simpler rule base, which shows comparable results. The effect is achieved by taking advantage of the rule base makeup of a regular linear fuzzy controller. Some slight modification is needed to the controller architecture, which is explained in detail. The rationality and validity of the proposed model are demonstrated through simulation in the Matlab/Simulink environment. The results show that the proposed new controller architecture obtains remarkable results, while having the advantage of increased simplicity in design and setting of parameters. Throughout the paper, opportunities for further improvement and research are highlighted and discussed.
Experimental Researches Regarding Strain Measurement of Incrementally Formed Sheet Metal Parts Done Using an Industrial Robot
Authors: Chera Ionut , Bologa Octavian , Racz Gabriel , Breaz Radu
Published: June 2014

This paper aims to provide results regarding the measurement of the strains in the material of sheet metal parts which have been incrementally formed. The incremental forming of the steel sheets has been performed with the aid of a KUKA KR 6 industrial robot on a specially constructed stand, and the measurement of the strains has been done using ARAMIS optical measurement system. The trajectory of the forming punch which is attached to the robot was designed using CATIA V5 and the movements of the robot were designed and simulated in DELMIA software. DELMIA generated the program code needed for the robot to execute the desired movements in order to form the sheet metal parts.
Some Characteristics of the 3($P$) Parallel Manipulator Inverse Model
Authors: Ungureanu Liviu Marian , Comanescu Adriana , Comanescu Dinu
Published: June 2014

A 3($P$) parallel manipulator with three degrees of mobility may be used in different purposes, such as a spatial flight simulator. The same equations but with different unknowns characterize its direct and inverse positional model. By adopting the Euler angles for the mobile platform the inverse positional model is simplified. There are determined the parameters of the linear actuators, which are verified for different situations by graphical simulation in a suitable environment.
Comparative Study on Autonomous Robot Trajectory Determination in an Unknown Indoor Environment
Authors: Gîrbacia Teodora
Published: June 2014

In this paper is presented a comparative study between using extended Kalman filter and particle filter applied on SLAM algorithm for an autonomous mobile robot. The robot navigates through an unknown indoor environment in which are placed 80 landmarks and it creates the map of the environment. Because the sensors placed on the robots produce measurement errors it is necessary to use Bayesian filters as the Kalman filter or the particle filter. An application was implemented that shows the estimated measurement errors produced while using both filters in order to create the estimated map of the closed environment in which the autonomous mobile robot is navigating.
Influence of the Flow Section Geometry on the Static Characteristic Curves of Proportional Hydraulic Throttle Valves
Authors: Avram Mihai , Duminică Despina , Bucşan Constantin
Published: June 2014

Various constructive versions of hydraulic units found in the structure of proportional hydraulic equipment are analysed in the paper. For each version, the authors establish the variation law of the flow section in function of the position of the adjusting element in relation to the reference position. The approach is useful when a theoretical analysis of a proportional equipment is needed, as well as when the characteristic diagrams of the equipment are theoretically established.
Artificial Neural Networks for Modeling of Chemical Source Terms in CFD Simulations of Turbulent Reactive Flows
Authors: Porumbel Ionuţ , Petcu Andreea Cristina , Florean Florin Gabriel , Hritcu Constantin Eusebiu
Published: June 2014

The main goal of the work presented here was to develop, implement and test a highly efficient numerical algorithm for the evaluation of the chemical reaction source terms that appear in the Navier - Stokes equations when a turbulent, premixed, reactive flow is simulated using a finite rate chemistry combustion model. The approach was based on employing Artificial Neural Networks (ANN) that were designed, trained and incorporated into an existing LEM – LES numerical algorithm. Two numerical simulations of reacting flows have been carried out using several techniques for the estimation of the LES filtered reaction rate for the chemical species in laminar and turbulent, premixed, reactive flows, and the results were compared in terms of numerical accuracy and computational speed. It was concluded that the ANN approach provides a significant speedup of the numerical simulation while preserving acceptable accuracy.
Finite Element Method for Simulating the Vickers Hardness Test
Authors: Popovici Victor , Pavalache Adrian Catalin , Vasile Mihai , Voiculescu Ionelia , Stanciu Elena Manuela , Pausan Doru
Published: June 2014

The purpose of the present paper is to present a different approach to the finite element modeling of the Vickers hardness test measurement, and to establish a numerical correlation between the Young modulus of a material and its hardness. In order to realize this, calculations were based upon the tensions acquired as a result of the hollow caused in the investigated materials by the indenter the maps of stresses. The present work demonstrates that from the results of the simulation based on the finite element method it is possible to compute a material’s hardness.
The Analysis of the Influence of EMR Effects Provided From the Mobile Phones with Different SAR Index
Authors: Ungureanu Loredana , Cristea Luciana , Bulmaga Marina , Cazangiu Diana
Published: June 2014

The researches realized on the biological effects of Electromagnetic Radiation (EMR) highlighted that the exposure of the human factor on the electromagnetic radiations of high frequency determines an excessive heating of the tissue causing different burning types. The aim of this paper is to analyze, by comparison, the effect of heating of the facial tissue under the Electromagnetic Radiation (EMR) influence provided from two mobile phones with different Specific Absorption Rate (SAR) index. Helping with the thermal maps, it determined the heating level of the human tissue exposed under the EMR generated by the phone during the conversation. The results obtained after the analysis are very useful for the evaluation of the heating level of the facial tissue in function of the SAR absorption index of the phone
Use of Equimomental Systems in Calculating Inertial and Dynamic Quantities of Plane Plates
Authors: Orăşanu Nicolaie , Craifaleanu Andrei
Published: June 2014

The paper proposes a method for the reduction of an arbitrary-shape plane plate to a symmetrical discrete system of material points, with the same center of mass and the same tensor of inertia. It is shown, first, that an elliptical plate can be reduced to a symmetrical system of five material points, with a spatial distribution directly related to the shape of the plate. The results are subsequently generalized for plane plates of arbitrary shape. By using the reduction procedure, various mechanical quantities can be calculated more simply, as compared to the traditional methods. The proposed method finds application in the dynamic, vibration and structural analysis of complex mechanical systems that include rigid plane plates, such as industrial robots.
Theoretical and Experimental Researches on the Balancing Systems of Machine-Tools Feed Kinematic Chains
Authors: Prodan Dan , Bucuresteanu Anca , Balan Emilia , Motomancea Adrian
Published: June 2014

In this paper, the authors present some of the theoretical and experimental researches conducted in recent years in the field of large masses shifted vertically. The paper starts with a technical-economical comparative analysis of the hydraulic and mechanical balancing. The following are the most commonly used systems of hydraulic balancing for modern machine-tools, the CNC ones especially. Finally the paper presents some of the experimental achievements materialized in hydraulic balancing units for machine-tools.
Researches Regarding Optimising the Contouring Precision of CNC Laser Cutting Machines
Authors: Biris Cristina , Breaz Radu Eugen , Girjob Claudia , Chicea Anca
Published: June 2014

This paper presents some experimental researches regarding the manufacturing accuracy of a profiling machine together with an approach to eliminate the positioning and contouring errors. A mathematical model based on transfer functions is used as starting approach in order to tune the feed drives of the machine. The accuracy of the profiling machine is tested before and after the tuning process, in order to validate the proposed approach. There are unfolded both positioning tests along one axis and contouring tests on two axes.
Parallel Evolutionary Algorithm for Computationally Expensive Single Criteria Design Optimization
Authors: Krenich Stanisław
Published: June 2014

The paper presents an approach to design optimization using parallel evolutionary algorithms. The only use of a simple evolutionary algorithm in order to generate the optimal solution for complex problems can be ineffective due to long calculation time. Thus a tournament evolutionary algorithm (EA) and a parallel computation method are proposed and used. The proposed EA does not require an analysis of the optimization model for each potential solution from evolutionary populations. The second element of the method consists in parallel running of evolutionary algorithms using multi-threads approach. The experiments were carried out for many different single design optimization problems and two of them are presented in the paper. The first problem considers a task of robot gripper mechanism optimization and the second one deals with the optimization of a shaft based on Finite Element Method analysis. From the generated results it is clear that proposed approach is a very effective tool for solving fairly complicated tasks considering both the accuracy and the time of calculation.
Optimum Design of Balancing Systems with Real Springs
Authors: Ciupitu Liviu
Published: June 2014

The static balancing of the weight forces of any mechanical system which is not working in horizontal plane is considered in order to decrease the acting power. From practical point of view two main ways of balancing could be taken into consideration: by mass redistribution of components and/or by adding counterweights, and by elastic forces of the springs or of the gases.The first solution is not always possible due to the clearance diagram of mechanical systems and due to increasing of the dynamic stresses of components. Second solution is more and more used to various mechanical systems and many constructive solutions were proposed in last time. The complexity of balancing systems with springs comes from the need of using zero-free length springs.In any case the mathematical model has not a unique solution. Present paper is continuing a former paper of author and is presenting a method to find the optimum solution of the simplest elastic system which is using a real spring. Design variables are the position of spring’s joints, as well as the constructional parameters of a real spring.
On Determining the Optimal Relation between the Mental Tension and Human Motricity
Authors: Ionescu Cecilia Liliana
Published: June 2014

Considering the major changes that continue to occur in today's society, the constant practice of physical education and sport activities represents a necessary condition to reduce/remove the negative mental tension. The habit to participate in motricity activity has to be developed and learned since early childhood and once reached maturity, the adult acknowledges the necessity of it, the usefulness and benefits of practicing this type of activities leads to a healthy lifestyle.The young people’s openness towards different forms of physical exercise, on medium and long term, has a decisive role in maintaining a good state of health, of promoting sets of values, behavioral, social and personal attitudes. The purposiveness of these actions determines young men’s development with direct positive effects concerning the way of displaying social-relational and professional demonstrations. The scope of this research becomes two-pronged: firstly, it aims to find out what are the young people’s views concerning the importance of performing physical education activities so that to minimize the mental tension states, all these with positive effects towards bio motion potential, linked with a high return of the academic activity and within the social relations. Secondly, the scope is to know if participating in such activities will generate the increase of the satisfaction level through relaxation and tension release.