bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of Powertrain System Dynamic Behavior with Torsional Vibration Damper
Authors: Deuszkiewicz Piotr , Pankiewicz Jarosław , Dziurdź Jacek , Zawisza Maciej
Published: October 2014

The paper presents the results of experimental and model research of powertrain system built with torsional vibration damper. The behaviour of powertrain system with and without vibration damper was shown in the conditions of acceleration and deceleration with different increases of rotational speed. Next, authors describe the process of building a mathematical model of such a system and its identification on the basis of experimental results. When examining the results obtained with empirical and model research, it has been shown that in the structural and parametric identification of model of such system, the main factor affecting the right development of the structure should be dynamic criterion, since the only use of static criteria leads to big errors. On the basis of such model we can make some structural solutions to the system to minimize torsional vibrations.
The Choice of Diagnostic Symptom on the Basis of Mathematical Model Analysis
Authors: Chiliński Bogumił , Markuszewski Damian
Published: October 2014

Composite mast with rigging system is an example of a complex composite-steel system. The implementation of modern constructional materials such as composite materials in order to construct the composite masts has some consequences. Composites have different properties than materials such as wood (in the past), steel or aluminium which are usually used in construction of the masts.
The Load Model of Chosen Element of Underframe with Use the Acceleratrion Signals
Authors: Kosobudzki Mariusz
Published: October 2014

Nowadays modern mechanical objects, above all that which are use in special purposes use the most innovative solutions that should increase their functional quality. The maintenance of those mechanical objects involves the high financial expenditures which is strictly connected with the total life cycle costs. To reduce those costs and keep up the mechanical readiness index on acceptable level the condition based maintenance strategy is more and more desirable. This is connected with the total durability of the element and its threshold value. So, in the strategy the tracking of the loss of maintenance potential of analyzed element is necessary and evaluation of the residual durability as well. In the paper, the method of life estimating the chosen element of high mobility vehicle was presented. This class of vehicle is constructed to move in various on-and off-road conditions. In many cases this vehicles play a key role in public utilities and armed forces. Very often the high mobility chassis has been used to create a special purpose vehicle. The total cost of life cycle this class of vehicles is considerable, so a method to check the loss of maintenance potential of vehicle is desirable . To solve this problem and draw up a mechanical and maintenance characteristics of a vehicles profiled ground tests have been created and various tests have been carried out . This approach have been time consuming and very expensive. What is more, results of tests are strictly connected with sort of roads selected to tests and depends on a lot of random variables. So, a worked out characteristics are statistically correct rather for the whole group of vehicle than to every single one. The proposed method is able to track the loss of maintenance potential of a critical element of every one vehicle of this class in real road condition. The method joins possibilities of calculating the load in frequency domain with fatigue strength of the most loaded points in an analyzing unit according to its FEM model. The developed method enabled to characterize relationship of decrease of maintenance potential of the critical element in terms of the type of the road and surface, and the speed of movement . The method makes it possible to forecast the residual work capacity expressed in units of time and after taking the speed of movement into consideration, also mileage expressed in kilometers.
Decreasing the Contact Surface between Piston and Cylinder at the Heat Engines by Rotary-Percussion
Authors: Chirita Daniel
Published: October 2014

Nowadays the surface fine finishing processes ensure, according to the quality of the initialsurface, the initial quality of the cut metal, the operating mode used for processing, the value of roughness with values between Ra = ( 0.4 .. . 0.02) μm. This leads to the reduction of the size of the layer deformed in the previous processing, and to the decrease of the micro-hollows of the resulted roughness serving as lubricant stores contributing to a decrease in the abrasion resistance of the contact surface of the cylinder. From this context it results that bearing area or rather the work area tends towards 100%. This study will present a method of plastic deforming of the inner cylindrical surface by rotary-percussion. I intend to apply this plastic deformation between the honing operation for the scalping of the heat engines cylinders and the finishing honing. The micro-hollows created by percussion will provide oil deposits to eliminate the dry friction, and their density on the cylinder surface will contribute to reducing the load-bearing work surface. The load-bearing work surface obtained with this process will be the total surface minus the surface of the concavities executed through rotary percussion. This procedure applied to the final machining operation by honing the cylindrical surfaces aims at replacing the finishing honing with lapping thus eliminating the running operation at the commissioning of the heat engine. The process has several technological and economic advantages, such as: the malleability of the metal which the cylinder is built of can be higher, the wear of the piston’s surface will decrease the effect of polishing between the piston and the cylinder , the engine will be able to work at higher speeds because the effect of lubricating the contact surfaces will be enhanced; the elimination of the running operation will decrease the cost and time of the installation parameters specified by the manufacturer, the micro-hollows are not compatible with each other so that the oil in the concavities is not blown by the burning gases before the piston passes by them.
Modelling of Torsional Vibrating Systems with Composite Piezoelectric Assemblies
Authors: Płaczek Marek , Buchacz Andrzej , Wróbel Andrzej
Published: October 2014

Work presents a proposal of mathematical algorithm used to analyse torsional vibrating systems with composite piezoelectric assemblies. In this paper systems with composite piezoelectric assemblies made of a combination of piezoelectric segments forming a ring transducer are considered. This is why such kind of transducers can be easily used in torsional vibrating systems. A mathematical model of the system was created and characteristics of the system were calculated using an approximate method. Obtained results are presented on charts and analysed. The main aim of this work is to prove that the mathematical algorithm that was presented in the previous authors works can be easily used in order to analyse systems with new, advanced and non-classical piezoelectric transducers.
Tribological Properties of Polymer Composites Reinforced with Silver Particles
Authors: Wieczorek Jakub , Blacha-Grzechnik Agata , Łabaj Jerzy , Siwiec Grzegorz
Published: October 2014

The paper presents results of investigations on a potential for utilisation of waste materials, containing silver powders, ceramics and polymer, for production of PTFE-matrix composites. The waste is a mix of Ag powders (10 – 15%), SiC and Al2O3 powders (20 – 50%) and polymeric powders (20 –50%). For composite production, high-temperature press moulding method was applied. Reinforcing materials and the matrix powder were mixed and subjected to the pressing process in a graphite mould at 350oC. Composite specimens containing 25% Ag, 50% Ag and 75% Ag were obtained. For the obtained composites, density, HB hardness and a friction coefficient were determined. The friction coefficient was evaluated in the “pin-on-block” test with the sliding distance of 2500 m and a load of 25 N with no lubrication. Wear of the composites was assessed based on a profilometry analysis. The obtained results suggest that the composites may be applied for manufacturing of components resistant to abrasive wear with a required, low friction coefficient.
The Implementation of the Material Loss Detection Method in the Author Computer Aided Overhaul Software
Authors: Janik Witold
Published: October 2014

In order to prepare a refurbishing process of an element that characterize with a material loss which is a result of worn process or damage could be 3D scanned. Then it 3D model is gained after triangularization process and surface fitting. This model is compared with a CAD model which is an element design representation. In order to provide such comparison, the proper implementation of the MLDMCS (Material Loss Detection Method for Cylindrical Shape parts) in to the software is needed. The software is prepared in Visual Studio environment (.NET) with C# programing language (the algorithm code and the interface), SQL server (database) and Siemens NX software (PARASOLID internal libraries). MLDMCS is implemented as the one of the author Computer Aided Overhaul software modules (CAO). The implementation is a complex task, according to: interface preparation, data collecting, data presentation an input data form, proper set of input data configuration, preparation of 3D graphics processing an analysis algorithms, preparation of output data form and interpretation. The result of software algorithm should be an easy to interpret set of data with a possibility of automatic rapport generation. Furthermore the data should be collected in a data base for future analysis of element worn and damage repeatable progression. Data collected each time from a element during it technical state examination gives also an answer to future proceeding according critical quantity of refurbishing processes in recirculation of technical mean. Additionally collected data gives suggestion of it repeatability in worn or damage after various technologies of refurbishing. Future systems probably will be set on such solution and MLDMCS will be one of typical method used in industry oriented to overhaul of machines parts. Previously presented article, shows only pure method with it foundations. Nowadays solutions are mainly based on a metrology, also supported with CMM (Coordinate Measuring Machines) and offline measuring paths generating systems. The accuracy of proposed solution (3D scanning and transformation of point clouds to solid model) is less accurate than typical measuring methods; however foresights of application are promising. The demand accuracy is sufficient in order to prepare a cladding process by turning worn-out or damaged surface layer.
Computer Aided Design of Classic External Geneva Mechanism
Authors: Stănășel Iulian , Blaga Florin , Buidos Traian
Published: October 2014

Geneva mechanism is used as a mechanism for transforming rotary motion into intermittent motion and is able to achieve a precise movement and its lock, which makes it usable in many areas, particularly in timer devices, measurement devices, feed mechanisms, positioning mechanisms, pick-up and transport machinery, textile machinery etc. The studied literature showed that, although it has long been known, this mechanism is still interesting for contemporary researchers. The present paper proposes a method of synthesis and a computer-aided kinematic and dynamic analysis for this mechanism. Based on input data, it was developed a computer program that computes the dimensions of components of Geneva mechanism and determines velocity acceleration and displacement of Geneva wheel. The dimensional calculated data were also used to obtain 3D model of the mechanism.
Studies on Establishing a Methodology for Predicting the Riveted Joints Fatigue Durability in Aircraft Structures
Authors: Nedelcu Roxana , Bartiș Daniela , Lupaș Anca , Ilie Constantin , Voicu Daniela
Published: October 2014

In this paper are described fatigue physical tests that were performed on a great number of riveted specimens with different constructive and technological parameters. Some of the purposes of the experimental tests, they were: determining the number of load cycles at which cracks by fatigue occurred, determining the moment of initiation, the location and propagation speed of the fatigue crack.
For fatigue crack evolution study numerical models were designed. A simplified model for FEM analysis was proposed that reduced considerable the calculus effort and allows models for complex riveted joints. From the described experiments on specimens and numerical simulations there are some important conclusions regarding the fatigue phenomenon in riveted joints such as: important peculiarity of damage by multiple cracks is the cracks junction of adjacent rivet holes, which contributes, by jumping, to increase the degradation rate of assembly; the riveted joint model can be applied with good accuracy to estimate the durability of the structures inclusively to identify and prevent the cases of widespread fatigue damage.
Analytic General Solution Employed to Calculate the Geometrical Characteristics in Structural Problems
Authors: Oanta Emil , Constantinescu Eliodor , Raicu Alexandra , Axinte Tiberiu
Published: October 2014

The automatic calculus in structural problems was a constant concern of the authors, several models of the phenomena being based on algorithmic generalizations of the analytical methods, where the solutions were either ‘exact’ or numerical. The calculus of the geometrical characteristics is important, being closely related to the calculus of the stresses, of the displacements, of the bucking and in other structural problems. This is why an algorithm designed to compute the geometrical characteristics, must take into account all these aspects. A first general and original solution was to create a Boole algebra based on simple shapes for whom there are direct calculus relations and to create complex geometries of the composite cross-sections using the addition and subtracting operations. This method offered an important advantage regarding the position of a very small set of points belonging to the section where the maximum stresses could be found. The weakness of the method consists of the very few ‘simple’ shapes which could be included in the library of the software application. A first direction to generalize the method would be the definition of new simple geometrical shapes, to be included in the general algorithm and in the library of the software application. Other shapes may be also included, such as the rolled steel girders: I-shaped beams, C-shaped beams and others. However, more general methods may be conceived, expressed as algorithm and implemented.

The paper presents an original method to calculate the integrals, based on a mathematical generalization of the, so to-say, ‘classic’, theory. The method has some strong points, such as: it is very flexible regarding the definition of the domain; the effective calculus may be done either in a direct way or using the numerical methods; it can be easily adapted to employ approximative solutions in order to check the accuracy of the results using alternate approaches; the computer program may be conceived in several ways, fact which offers another aid in the generalisation of the method. The method was tested and the results are accurate. The next direction of generalisation regards the creation of an algorithm which identifies the most relevant locations of the points where the maximum stresses may be found and the areas where sudden variation of the stresses may occur. In this way, there may be calculated only small amount of relevant ad important data regarding the strength of the structure.
Effect of Suction Pipe Diameter and Submergence Ratio on Air Lift Pumping Rate
Authors: Al-Maliky Salam J. Bash
Published: October 2014

The increasingly importance for the uses of the air lift pump in widespread list of fields (mining, nuclear industries, agricultural uses, petroleum industries...etc.) makes it very interested for the researchers to find tools to raise the performance outcome of such pumps.
An air lift pump system was setup to study the effect of the suction pipe diameter and submergence ratio on the liquid (water) pumping rate. The system has a lift pipe of (0.021 m) diameter and (1.25 m) length. Five diameters for the suction pipe (0.021, 0.027, 0.033, 0.048 and 0.063 m) with a fixed length of (0.3 m), were tested for each of the submergence ratios (0.2, 0.3, 0.4, 0.5) respectively.
Results indicate that the higher the diameter of suction pipe, the higher the pumping rate for a fixed submergence ratio. From another side, the higher the submergence ratio, the higher the pumping rate for a fixed suction pipe diameter. Also, under high submergence ratios, high pumping rates were achieved by the use of lower air flow rates compared with those used with lower submergence ratios. The experimental results show good compatibility with the model suggested by Stenning and Martin for the performance of an air lift pump.
Reinforcement Corrosion to Aggressive Environment
Authors: Constantinescu Vasile , Taran Rares George , Bogus Gheorghe Veniamin , Carcea Ioan
Published: October 2014

Corrosion of reinforcing steel in concrete leads to the premature failure of many structures exposed to harsh environments. Rust products form on the bar, expanding its volume and creating stress in the surrounding concrete. In this study we will present how metal acts into an aggressive environment and how we can adopt the best solutions to reduce the attack of corrosion. First we should understand how corrosion occurs. Corrosion occurs when two different metals, or metals in different environments, are electrically connected in a moist or damp concrete. This will occur when: steel reinforcement is in contact with an aluminium conduit; concrete pore water composition varies between adjacent or along reinforcing bars; where there is a variation in alloy composition between or along reinforcing bars; where there is a variation in residual/applied stress along or between reinforcing bars. Loss of alkalinity due to carbonation or chlorides, crack due to mechanical loading, stray currents, agents from atmospheric pollution, moisture pathways, low concrete tensile strength, electrical contact with dissimilar metals are some of the most important reasons of corrosion. Electro-chemical corrosion, which plays a subordinate role in air, is of greater significance in liquids. The extent of electro-chemical corrosion depends on the electrical conductivity of the liquid, which affects the protective influence of the zinc layer over greater or smaller areas. The pH value of the liquid is of most significance. The corrosion rate of zinc is normally low and stable in the pH range of 5,5—12,5, at temperatures between 0 and 20 °C. Corrosion outside this range is usually more rapid. Hard water, which contains lime and magnesium, is less aggressive than soft water. Together with carbon dioxide these substances form sparingly soluble carbonates on the zinc surface, protecting the zinc against further corrosion. Soft water often attacks zinc, since the absence of salts means that the protective layer cannot be formed. In some waters, polarity reversal can occur at about 70 °C so that the zinc coating becomes more electro-positive than the steel and pitting occurs. Oxygen, sulphates and chlorides counteract polarity reversal, which means that the problem may exist only in very clean water. Water temperature is of great significance to the rate of corrosion. Above approximately 55 °C, the layer-forming corrosion products acquire a coarse-grained structure and lose adhesion to the zinc surface. They are easily dislodged and expose new, fresh zinc for continued and rapid corrosion attack. The rate of corrosion reaches a maximum at about 70 °C, after which it declines so that at 100 °C it is about the same as at 50 °C. Keywords : composite materials, corrosion, reinforcement, water corrosion, reinforcement bars.
Visual Interface for Hybrid Programming of the Industrial Robot
Authors: Foit Krzysztof
Published: October 2014

Most of the modern robots could be programmed using only the operators panel, but the older machines often have very simple panels that do not cover advanced programming features. An example of such a robot is Mitsubishi Movemaster RV-M1, which is located in our laboratory. It is a small, five-axis robot which can be programmed only by using computer, while the panel is used only for storing current coordinates in memory. Due to the simplicity of programming language and very simple method of assembling the connection between the computer and the robot, the programming process does not require any dedicated communication software it is enough to have the editor operating in text mode. On the other hand, modern computers and operating systems provide big opportunity in term of building graphical interfaces. In this way the rough manner of programming could be replaced with a modern interface, which mimics the real panel. The one has been implemented for RV-M1 robot with a possibility of using the interface on mobile devices. The software could be also customized for other robots without the need of sources recompilation. An important advantage of the interface is the considerable reduction of the programming effort in comparison with the method of text editing, mainly due to the ability to use code snippets with one click.
Concepts of Flexible Production Line, on the Example of Robotic Cell
Authors: Banaś Wacław , Sękala Agnieszka
Published: October 2014

Modern manufacturing plants even if they produce in large quantities, they often have to change the settings of their production lines. Customers do not want a standard product but personalized models. If the differences are only an option that can be mounted to the finished elements is not difficult. When the differences are much more serious and require changes in the technology of the element. Such orders are collected and made periodically so customers have to wait. Sometimes the wait time is several months. Changing the configuration of the production line or just a robot cell is a difficult and time-consuming process. It is necessary to stop the entire production line, the partially disassemble and installation of new equipment, and after the production of the series, the process repeated. The reconfiguration can take from several hours to several days, even weeks. These changes are costly, and these costs are borne by people buying individual model. Here are examples of the concepts presented elements of an exemplary robotic cell. Different degrees of modification will be presented from simple mechanical systems shortening the time to reconfigure the cell to a fully automatic reconfigurable systems. As an example will be presented to the cell welding. This cell is ready to make a specific item. The concept of adapting the cell to make the like is the first step modification. The next step is to automate the position so that the elements can be produced alternately. The introduction of an additional item of the approximated dimensions to the list made in a cell and automation, is another way to increase the flexibility of the cell. The final stage of the present article is the concept of robotic cell, designed to make the same process for any element. These concepts require a change in transmitting information to each of the stages and the whole process control at every stage. It is possible to transfer productive resources but this requires advanced management methods. Ensuring the mobility of selected measures to increase production efficiency but this requires the use of such multi-agent systems.
Recognition of Geometric Shapes in Images
Authors: Cohal Viorel
Published: October 2014

This paper proposes finding optimal ways of recognizing geometric shapes (square, circle, rectangle, etc.) of files in different formats. Shapes recognition is a field of artificial intelligence, which includes all representation and decision techniques to automate the process of identifying similarities between objects or phenomena. An application of shapes recognition requires the definition of descriptors and choosing a distance. An application of shapes recognition is done in two phases: learning and recognition. By learning to calculate the set of descriptors of known (reference). In recognition stage, we calculate the same set of descriptors for unknown form and compared with known shape descriptors. The comparison is made through a distance. Recognition is a decision problem if you say unknown form is the same as the reference shape and if you say unknown form is different form the reference. Classification of forms is done in five steps: Reading and image display, image transformation in binary image and get its negative, Discover crossing thresholds between levels of color, Determine the properties of objects and Classification of objects by shape. Are three methods: Chain codes, the conventional Hough transform, method Harris Corner Detection
Design and Kinematic Aspects of a Hybrid Locomotion Robot
Authors: Conduraru Slatineanu Alina , Doroftei Ioan , Conduraru Ionel
Published: October 2014

Comparing to wheeled robots, legged ones are more flexible and mobile on difficult terrain, where wheeled robots cannot go. Wheels excel on flat surfaces or specially prepared surfaces, where wheeled robots are faster than legged machines. Also, wheeled platforms have simpler mechanical architecture and control algorithms. But they do not perform well when terrain is uneven, which is the case in real life, legged robots becoming more interesting to research and explore. Hybrid locomotion systems were developed to exploit the terrain adaptability of legs in rough terrain and simpler control as well as high speed associated with wheels. In this paper some information about the mechanical design and kinematics of a small hybrid locomotion robot are presented.
The Markup Language as a Form of Description of the Robot’s Scene
Authors: Foit Krzysztof
Published: October 2014

The purpose of this paper is to show the possibilities offered by the use of markup language in the process of programming of the robot. In this paper, the author primarily focused on the problem of description of the objects’ arrangement on the robot’s scene. The XML format is selected among the various possibilities of using the markup language, due to the fact that most of the software for the simulation of manufacturing processes can export the virtual space configuration to the XML file. The XML (Extensible Markup Language) is a formal language that allows the representation of data structures in a way understandable to a human and suitable for machine processing. The other, significant advantage of the XML is that it is platform-independent language. Its structure is more understandable and much easier to learn than synthetic programming language, so it can be quickly acquired and used by a person who is not a programmer. In this paper, the focus has been mainly put on the presentation of the method and on the assumptions used in the examples given for a simple scene setup and simple manipulation tasks.
A Mobile Robot with Modified Mecanum Wheels
Authors: Conduraru Ionel , Doroftei Ioan , Conduraru Slatineanu Alina
Published: October 2014

Mobile robots applications are demanding them to move in tight areas, to avoid obstacles, finding their way to the next location. In the case of wheeled robots, these abilities mainly depend on the wheels design. A mobile robot with omni-directional capabilities is very attractive because it guarantees a very good mobility in such cases, being able to move instantaneously in any direction from any configuration. These capabilities mainly depend on the wheels design. This paper provides some information about the mechanical design of an omni-directional mobile robot with modified Mecanum wheel, as well as about its control.
An Overview on Ankle Rehabilitation Devices
Authors: Racu Cazacu Cristina Magda , Doroftei Ioan
Published: October 2014

People with walking disorders, due accidents or stroke, can be treated to regain their mobility. Conventional therapy is laborious and time consuming. Therefore a new tendency was born, to facilitate the rehabilitation and to reduce time spent on the machines. Rehabilitation robotics is a field in continuous expansion and recently novel mechanisms have been designed to help humans to regain their mobility. In this paper a short overview of ankle recovery systems is presented.
Simulator of the Car for Driving Courses for the People with Mobility Impairments
Authors: Ociepka Piotr , Banaś Wacław , Herbuś Krzysztof , Kost Gabriel
Published: October 2014

This paper presents the results of the project conducted by the authors, which purpose was to build the simulator for teaching the disabled persons driving a car. This paper presents also the functional design requirements established for the project. The structure of the mechatronic system, basing on which the simulator was built, is also presented. It was also described the details of each subsystem of the simulator and its possibilities and the method of its functioning.
Automatic Generation Method of Simulation Model for Production Planning and Simulation Systems Integration
Authors: Krenczyk Damian
Published: October 2014

In the paper the method of integration of production planning and simulation systems has been presented. An automatic generation method of production systems models has been implemented to integrate the Production Order Verification System (SWZ) for multi-assortment, concurrent production planning) and Enterprise Dynamics simulation system. Submitted methodology allowed the direct generation of simulation models for production systems with the use of data obtained from PPC systems, regardless of the production system structure, flow topology of the production processes and the amount of resources and production orders. Generation of simulation models is performed automatically, allowing the omission of time-and labor-consuming process of building a simulation. In the process of generation of the simulation models, methods of data mapping, transformation and exchange, between heterogeneous computer systems (PPC/DES) using neutral formats and data storing (XML) in conjunction with an intermediate neutral data model have been used. The result of transformation is the input file for simulation systems, containing information about the production system model, together with control procedures. Based on the described methodology, operation algorithms have been developed and the computer software RapidSim, that integrates PPC and DES systems has been presented.
The Procedure of Reaction to Unexpected Events in Scheduling of Manufacturing Systems with Discrete Production Flow
Authors: Kalinowski Krzysztof , Grabowik Cezary , Kempa Wojciech , Paprocka Iwona
Published: October 2014

Rescheduling, as a process of updating the production schedule is a very important element of production planning and control. The occurrence of events that outdate existing schedule is a typical situation in real manufacturing systems. Correct reaction to them allows maintaining the continuity of production and the value of evaluation indicators at the satisfactory level. The paper presents the general rescheduling procedure including activities taken from the occurrence of a disturbance up to introduction of the revised schedule. The procedure includes following steps: registering and identification of the event parameters, decision-making steps about the need and time for schedule correction, steps of changing the scheduling model, selection of rescheduling method, selection of a set of operations to rescheduling and also steps of the creation, selection, and implementation of the new schedule .
A New Procedure of Production Orders Sequencing in Mixed-Model Production Systems
Authors: Zemczak Marcin , Krenczyk Damian
Published: October 2014

The paper presents the task scheduling issue, which main aim is to establish a proper sequence of tasks, that would maximize the utilization of companys production capacity. According to the literature sources, the presented sequencing problem, denoted as CSP (Car Sequencing Problem) belongs to the NP-hard class, as has been proven by simple reduction from Hamiltonians Path problem. Optimal method of solution has not yet been found, only approximate solutions have been offered, especially from the range of evolutionary algorithms. Regardless of specific production system, while considering reception of new tasks into the system, current review of the state of the system is required in order to decide whether and when a new order can be accepted for execution. In this paper, the problem of task scheduling is limited to the specific existing mixed-model production system. The main goal is to determine the effective method of creation of task sequence. Through the use of computational algorithms, and automatic analysis of the resulting sequence, rates of production are able to be checked in a real time, and so improvements can be proposed and implemented.
On Pareto Optimal Solution for Production and Maintenance Jobs Scheduling Problem in a Job Shop and Flow Shop with an Immune Algorithm
Authors: Paprocka Iwona , Kempa Wojciech M. , Kalinowski Krzysztof , Grabowik Cezary
Published: October 2014

In the paper a job shop and flow shop scheduling problems with availability time constraint for maintenance are considered. Unavailability time due to maintenance is estimated basing on information about predicted Mean Time To Failure/To First Failure and Mean Time of Repair of a machine. Maintenance actions are introduced into a schedule to keep the machine available in a good operation condition. The efficiency of predictive schedules (PS) is evaluated using criteria: makespan, flow time, total tardiness, idle time. The efficiency of reactive schedules (RSs) is evaluated using criteria: solution and quality robustness. For basic schedule generation Multi Objective Immune Algorithm is applied. For predictive scheduling Minimal Impact of Disturbed Operation on the Schedule is applied. After doing computer simulations for the job shop scheduling problem following question arises: do dominated Pareto optimal basic schedules achieve better PSs Although a single Pareto-optimal solution is achieved on Pareto-optimal frontier three different schedules have the same quality in the flow shop scheduling problem. The question is: which schedule is the most robust solution
Analytical Interpretation to Optimize Transport Systems
Authors: Ciortea Mihaela Elisabeta
Published: October 2014

This paper aims to analyze the classical transport system using only two processing centers, maintenance can ensure, without negatively impacting the transportation system optimization. To achieve transport system simulation packages have been used to simulate Petri and implementation specialist and preparing conclusion is made based on data specialist. The model is intended to be a source of help in the activities of companies seeking to optimize the transport system and not be disrupted by achieving maintenance. Benefits are those prototypes and analyze the whole system after the implementation of tracking and being able to control the entire system, leading to the prevention and elimination of queues later appearance possible accidents. Studying this system model can deduce new information without the high costs.
Databases Model for Determining of Technological Features Based on the Theory of Technological Similarity
Authors: Rzasinski Rafal
Published: October 2014

The main achievements presented in this paper are developed method orientated on computer aiding and computer program method, both used in designing process of the new technical features. Analyzed methods develop algorithmisation of selection features and support integration with the process of the preparation of the production. Further analyses will be carried on in order to specify the theory of the technological similarity in the new forms of computer aiding (relational databases). The represented programs were being developed on the practical examples of creating the module systems of hydraulic cylinders used in mining, slag cars used in metallurgy and gears series of types. Programs and data bases presented in the paper are basis of selection of the technological features in the process series of types of the technology creating. All of these applications support the intensive development of the types of technical features and affect on their competitive on the ready market.
The Influence of Sliding Velocity on the Wear Intensity in Case of Polymeric Composite Materials Reinforced with Short Carbon Fibers
Authors: Caliman Radu
Published: October 2014

This paper presents a study of the tribological properties of polymeric composite materials reinforced with short carbon fibers. Reinforces carbon fibers materials are more effective if refer to specific properties per unit volume compared to conventional isotropic materials. Potential benefits of carbon fibers composite materials are: high resistance to breakage and high value ratios strength/density; resistance to high temperatures; low density and high resistance to wear; low or high friction coefficient. The composites are complex and versatile materials; their versatility it is given by the multitude of choice variety of the constituent materials that can be combined to obtain the desired properties of otherwise unobtainable from conventional materials. The composite materials used in this research work are obtained combining epoxy with short carbon fibers with titanium carbide and tantalum carbide in order to investigate the variation of the friction coefficient for three different sliding velocities. Varying the percent of epoxy from 29,35% to 43,92% and the percent of short carbon fibers from 35,43% to 53,70%, nine different composite materials are obtained and tested. Friction tests are carried out, at room temperature, in dry conditions, on a pin-on-disc machine. The friction coefficient was measured maintaining constant the pressing force (8 daN) and sliding time (120 sec), and varying the sliding velocity to 8, 14 and 23 m/sec. The main objective of this research work it was to identify a composite material with higher friction coefficient.
The Use of ERP Systems to Determine the Impact of the Company on the Environment
Authors: Horzela Izabela , Szczucka-Lasota Bożena , Węgrzyn Tomasz , Majewski Wojciech
Published: October 2014

ERP systems help organizations to monitor and report on environmental factors, both in the area of individual plants or entire companies. Regular monitoring and analyzing indicators of impact of the company on the environmental enable organizations to determine the effects of the implemented environmental programs. Article concerns the monitoring and reporting of environmental impact in relation to the use of raw materials and semi-finished products in manufacturing processes.
Predictive and Reactive Scheduling for a Critical Machine of a Production System
Authors: Paprocka Iwona , Kempa Wojciech M. , Grabowik Cezary , Kalinowski Krzysztof
Published: October 2014

In the paper a production model with failures is presented where successive failure-free times are supposed to have normal distributions and are followed by normally distributed times of repairs. Unknown parameters of distributions are estimated using e.g. empirical moments approach. Predictions of unknown parameters are done using classical regression method. Having Mean Time To First Failure, and Mean Time of Repair a disturbance robust predictive schedule is generated using rule: Minimal Impact of Disturbed Operation on the Schedule. If a machine's failure-free time is not successfully predicted reactive schedule is generated using criterion: Minimal Impact of Rescheduled Operation on the Schedule.
Sensitivity Analysis of Predictive Scheduling Algorithms
Authors: Paprocka Iwona , Kempa Wojciech M. , Grabowik Cezary , Kalinowski Krzysztof
Published: October 2014

In the paper a survey of predictive and reactive scheduling methods is done in order to evaluate how ability of prediction of reliability characteristics influence over robustness criteria. Survey analysis is done for two job shop scheduling problems: 5x8 and 5x10. The paper answers the question: what method generates robust schedules in case of a failure of a bottleneck occurrence before or after maintenance actions The Hybrid - Multi Objective Immune Algorithm (H-MOIA) is aided with heuristics: Minimal Impact of Disturbed Operation on the Schedule (MIDOS) for predictive scheduling and Minimal Impact of Rescheduled Operation on the Schedule (MIROS) for reactive scheduling. Sensitivity analysis is done for predictive scheduling methods 1) H-MOIA +MIDOS, 2) algorithm based on priority rules: the Least Flexible Job First (LFJ) and the Longest Processing Time (LPT) and 3) the Average Slack Method. Reactive schedules are generated for various scenarios of the bottleneck occurrence in order to evaluate the efficiency of predictive scheduling methods. Reactive schedules are generated using 1) H-MOIA+MIROS, 2) Right Shifting, 3) rescheduling disturbed operations to parallel machines first available. Efficiency of predictive schedules is evaluated using criteria: makespan, total tardiness, flow time, idle time. Efficiency of reactive schedules is evaluated using: solution robustness criterion and quality robustness criterion.
Sea Trails of Large Container Ships
Authors: Bostina Aurel , Bostina Alina Lucia , Acomi Nicoleta , Acomi Ovidiu Cristian
Published: October 2014

The container carrier shipping industry faces nowadays a similar phenomenon that happened in the 90s with crude oil carriers: an imaginable gigantism not-forecasted even by the most optimistic specialists. In the last 20 years the demand in transportation by containers continuously grew. The reaction of Carriers was quick under this demand growth and began an exacerbate competition not only in size of their fleets but in the size of their vessels as well.
Before building a new vessel, a set of simulations and tests of prototypes and models is done, in order to apply corrections of the initial projects but, the practice showed that each vessel is different and its behavior at sea, too. In order to be acquainted to dealing with the various situations at sea, the true measurements of the vessels performance are done in her sea trials.
The purpose of this paper is to update this Sea trials process, to detail it and to bring the contemporary element: measurement technologies, calculations, mathematical models.
A Retrieval Model of Spatial Configuration Based on Space Syntax Histogram
Authors: Li Chang Hua , Li Zhi Jie , Yuan Long Fei , Liu Xin , Zhang Fan
Published: October 2014

With the application of space syntax theory in urban planning and architecture designing is growing continuously, the number of the urban spatial configuration models based on space syntax will be more and more. However, the use of these models still lacks of some intelligent retrieval models currently. This paper splits the urban spatial configuration into regular grid structure, and uses visibility segmentation to construct the relationship diagrams and then extracts space syntax variables from each node to form the four-dimensional histogram. Furthermore, this method calculates the similarity among models through the measurement of the histogram distance, thus realizes the retrieval of the urban spatial configuration. Experimental results show that this model has a satisfactory retrieval results.
Analysis of Dance Approach in the Perspective of Multimedia
Authors: Zhao Zhi Juan
Published: October 2014

In an era of rapid-transpiring information, the art of dance enriches its artistic vocabulary via various disseminate techniques of visual media and multi-sensory stimulation while creating the innovation road of modern dance art. According to the current status of dance teaching in colleges and universities, we attempt to change the traditional teaching model of "words and deeds" for multi-media dance approach to carve out new fields of multimedia-assisted teaching.
Based on Digital Image Forensics Double JPEG Compression Algorithm
Authors: Chang Yu Hong
Published: October 2014

Means of digital image tampering diverse, new technical approach increasingly renovation, therefore, the detection of forged digital tampering issues are complex, and must not universal, once and for all solutions. In this paper, digital image tampering common practices through research, proposed a re-deposit operations for double JPEG image processing software compression testing technology method using image compression and decompression process lossy compression of images tamper with forensic, this method can play an effective role in the detection.
Design and Implementation of UDP-Based Coal Mines Enterprises Internal LAN Communications Software
Authors: Zhang Ying
Published: October 2014

With the economic development, coal mines internal communications began to appear and gradually gained popularity and development. This paper firstly analyzed the coal enterprise intranet LAN communications requirements, and then overviewed the UDP meaning and application and designed and implemented UDP-based coal enterprise LAN communications software, which achieved good results.
Image Tampering with Evidence Algorithm Based on Copy and Paste
Authors: He Yong Hui
Published: October 2014

Authenticity, integrity and authentication primitive technology for digital image content case of digital image forensics, as one branch of information security technology, is not pre-embedded image watermarks to forensic identification. In this paper, a common digital image tampering copy and paste operations have been studied and proposed detection method for this operation to improve the robustness of the algorithm.
Intensity of Coal and Gas Outburst Prediction Model Based on the Improved BP Neural Network
Authors: Kong Long
Published: October 2014

Coal and gas outburst has become one of the major disaster hazard of coal mine safety, Staff on gas outburst disaster prevention is now important research project. The gas outburst prediction work, different degrees of factors has some impact on forecast accuracy, such as logical reasoning efficiency is low. This paper, by using the BP neural network combined with gas outburst samples a prediction model is established, According to the data of a certain coal mine as a sample, Using MATLAB software to simulation test, have been predicted and actual values fitting degree is higher, Can reflect the realities of the coal and gas outburst.
Research of Reconfigurable Measurement Method Based on Mobile Terminal
Authors: Song Xue Kun , Song Peng Fei , Zhang Pei Jiang , Du Juan
Published: October 2014

Reconfigurable virtual instrument measurement model was put forward based on mobile terminal according to the problem of poor mobility and real-time performance in traditional test system. Research a dynamic communication mode in network space, reconfigurable virtual instrument library was developed in mobile devices which is support Android Operating System, and the networked wireless test was carried on, realized the function of reconfigurable virtual instrument test system on mobile terminal.
Research on Algorithm of Delaunay Triangulation Net Interpolating the Best Point
Authors: Qiu Xing Guo , Liu Zheng
Published: October 2014

Aiming at the folds caused by the sparse data in the process of DTM (Digital Terrain Model), this article proposed a method of interpolating spatial control points based on Delaunay triangulation and Kriging interpolation algorithm. The terrain data of an area with complex terrain in Xianyang was used to construct terrain model according to the proposed algorithm. Experimental results show that the method can finish the interpolation of the terrain denser data quickly and accurately, and it provides an efficient technological tool for building a true three-dimensional terrain model.