bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation and Experiment of the Motion Characters in Twin-Screw Extruder
Authors: Zhu Li Xue , Wei Hong Yu , Luo Shao Ming , Zhao Chun Fang
Published: October 2015

In the paper, a velocity and fluid flow status of the melting process in twin-screw extruder were analyzed. To explore the optimum producing parameters of expanding food, several models of the flow field and velocity of twin-screw extruder were created with fake plastic Newton fluid. Then the velocity distribution rules in the cavity space were simulated. With the valuable verification of experiments, the results showed that, the velocity distribution near the inner wall is uniform, and increases at the delivery of the extruder. The velocity rises in the teeth root than in the top of the screws. At the mesh field, the velocity was changed frequently. The experiment of popped extrusion verified the simulation conclusion.
Kinematic Simulation and Analysis on Work Equipment of a New Type Loader Based on ADAMS
Authors: Zhang Lin , Cai Gan Wei , Wang Xiao Chun , Wen Fang , Chen Yuan
Published: October 2015

This paper describes the characteristics of the multi-DOF controllable mechanism type construction machinery, and has done the kinematic analysis on the work equipment of this new type loader. 3 dimensional model of the multi-DOF controllable mechanism type loader is established by Pro/E software, and describe the typical workflow of work equipment through step function. Through carried on the positive and inverse kinematics simulation used the dynamic simulation software of mechanical system ADAMS, we got the movement rules of the driving lever and the curve of the bucket dip angle. Finally, a small prototype model was built to test this new type loader.
Laboratory Testing of a High-Pressure Common Rail Injection Systems
Authors: Starý Petr , Popelka Josef
Published: October 2015

This article deals with the general issues of laboratory testing of high-pressure common rail injection system. Monitoring the movement of the needle and dynamic pressures is of great importance for further research, which will investigate the relationship between the movement of the lifting solenoid and the dynamics of the inlet pressure. At the same time we examined the possibility of operation for biofuel.
The Analysis of Influence Factors about Dynamic Characteristics of a Ball Screw Feed Drive System
Authors: Shi Y.G. , Xiao Hui , Zhang Jun Ao , Zhang Da Wei
Published: October 2015

This paper presents relationships between some vital parameters and the natural frequency of the ball screw feed drive system. A finite element model (FEM) of a machine tool feed drive system is established with joint parameters added in based on the SAMCEF software. Using the finite element model, the influences of the material properties of the worktable, the diameter of the ball screw and joint parameters on the natural frequency of axial vibration are derived. These results provide a reliable basis for the optimization design of the ball screw feed drive system.
Emergency Stop and Drive Analysis of Bolted Flange Joints
Authors: Zhang Yan , Wang He Hui
Published: October 2015

The strength and tightness of flange joints will be weaker due to the temperature fluctuations. There exists no mature calculation procedure that can accounts for the temperature fluctuations’ effect on the performance of flanged joint. Based on the finite element simulation of a flanged joint under emergency stop and drive condition using ANSYS, the strength integrity and sealing performance of it are evaluated according to code JB4732-2005. The results show that stress of every component increases after experiencing an emergency stop and drive, flange deflection is more serious, resulting in integrity and tightness failure and can’t meet the sealing requirements. Repeatedly stop and drive will lead to discontinuity and alternating loads for the flanged joints, which will increase the leakage trend.
Total Structure FE and Theoretical Analysis of MAN Gas Holder
Authors: Yang Ran Xia , Wang He Hui
Published: October 2015

In the paper the total FE model of the MAN gas holder is built to analysis oil leak problem of MAN gas holder in steel plant. By comparing the FE result and theoretical result of MAN gas holder under internal pressure, it is observed that they have high consistency, which proved the reliability of FE model, and provided valuable basis for the following calculation. The main body load of MAN gas holder is circumferential stress, which is observed in total structure analysis result of the MAN gas holder. This kind of stress distribution proved to be the main reason of oil leak.
Study on the Dynamical Parameters of Inertial-Type Counter Flow Screen
Authors: Jiang Jing , Yang Hao , Liu Shu Ying , Wen Bang Chun
Published: October 2015

The structure of inertial-type counter flow screen is presented in this paper. It can be proved that the solid wastes with different friction factors and elasticity coefficients can be well separated by inertial-type counter flow screen. The more difference they have in friction factors and elasticity coefficients, the better sorting performance can be achieved. The selection and calculation on the dynamical parameters of inertial-type counter flow screen is carried out. The study provides the theory basis for the design on new-type friction separation equipment and develops new prospects for the application of inertial-type counter flow screen.
Study of a Vertical Axis Wind Turbine Using Fluid Particle Trajectory
Authors: Lemu Hirpa G. , Petrova Radostina , Mihailov Assen
Published: October 2015

Because of growing global concern for the increasing energy demand and the resulting environmental impact of fossil fuel based energy sources, renewable and environmental friendly energy sources are critically sought. Wind turbines are generally conceived as the key renewable energy sources, but more innovative solutions should augment the classical design and control of wind turbines in order to improve the energy conversion efficiency. For areas outside the integrated grid system and harsh operation conditions in particular vertical axis wind turbines show promising results. This turbine design is previously considered less efficient, and thus the performance has not been sufficiently documented. This paper attempts to contribute in better understanding of the wind flow around the rotor, and the way the rotor components react to the resulting pressure. The turbine is first modeled in 3D CAD system and simulated in a flow simulator in a virtual wind tunnel. Then the iso-lines of velocity and pressure distribution are plotted at selected sections of the turbine plane and the profiles are studied to characterize the fluctuations of the dynamic pressure and identify the vulnerable zone of the turbine blades and the structure.
The Prediction of Velocity Distribution of Plate Jet with a EMMS Model
Authors: Yu Ke Zhi , Zhang Hai , Liu Yan Ling
Published: October 2015

The energy minimization multi-scale model is applied to the plane jet. The stability conditions of plane jets is adopted to predict the velocity distribution of plane jet. When the ratio of total dissipation to viscous dissipation tends to the maximum is used as the optimization condition and entrancement factor is considered as a constant, the Gauss velocity distribution can be concluded in the plane jet.
Numerical Simulation on Dynamic Laval Nozzle under Different Detonation Model
Authors: Yin Jun Ting , Li Gang
Published: October 2015

In conventional charge structure, the shell of charge’s containment is normally closed, with no explosive. When initiating charge, shell expanding to the outward, rupturing and eventually spreading out which was driven by the charge, this don’ have a guiding role to the detonation product flow. To further enhance the control of charge’s detonation product and energy flow, realizing the effective use of detonation products. The thesis put forward a structure design of filling thin-layer explosive in multi-layer shell, by initiating thin-layer explosive to control the deformation of shell, obtaining a approximately function with Laval Nozzle structure which can control the gas product when charge detonation. The thesis put forward a structure that including multi-layer explosive shell, establishing a numerical simulation model. Analysis the difference of shell’ deformation on different initiation method, provides a design references for further engineering application.
Processing Temperature of Sustainable Polymer with Thermoplastics by Injection Moulding (Part 1)
Authors: Rus Anika Zafiah Mohd , Salim Nurul Syamimi M. , Sapiee N. Haiza
Published: October 2015

This research is started by mixing in-house produced sustainable polymers (SP) from waste cooking oil with the standard low density polyethylene (LDPE) via melt-mixing at low ratios. These mixtures are then compounded via injection molding to produce tensile samples according to ISO 527 (5A). The parameters used in injection molding were initially set to follow the parameters of neat LDPE. Fortunately, by using the quality of individual compounds injected, the parameters obtained for all ratios were the same with neat LDPE. The corresponding mechanical behaviors of each ratio were also examined and the results showed that both tensile strength and strain of the LDPE/SP were better than neat LDPE. Therefore, not only does the presence of SP provide biodegradable properties, but it also improves the mechanical properties. It was concluded that the processing temperature and composition of SP will both influence the quality and mechanical behavior of the product made. This study may aid any intention on processing these in-house produced polymers by injection molding.
A Numerical Verification of the Reliability of a Split Hopkinson Pressure Bar with a Total Bar Length of 3 m and a Diameter of 1 Inch
Authors: Shin Hyun Ho , Lee Ho Yun , Kim Jong Bong , Yoo Yo Han
Published: October 2015

A short split Hopkinson bar system with a total bar length of 3 m (a 2 m input bar plus a 1 m output bar), a striker length of 254 mm, and a diameter of 25.4 mm, is designed. Through numerical experiments, the stress vs. strain curve and the rate vs. strain curve of the specimen are obtained from the bar signals. These measured curves are reasonably consistent with the input stress-strain curve of the specimen for the numerical experiment and the prediction by the recently reported rate equation, respectively, verifying the reliability of the designed SHPB system.
Validated Unsteady Computational Fluid Dynamic Analysis of an Oscillating Bio-Inspired Airfoil
Authors: Flint Tim , Ho Wei Hua , New Tze How , Jermy Mark
Published: October 2015

An unsteady, two-dimensional numerical study was conducted to investigate the aerodynamic and flow characteristics of a bio-inspired corrugated airfoil oscillating at 2Hz with an amplitude of 10°. The upstream flow was set such that the chord Re = 14,000. The computational results were validated against experimental results from a 2D particle image velocimetry (PIV) experiment on the same airfoil geometry. Complex flow structures such as the formation and shedding of trailing edge vortices have been revealed to have significant impacts on the lift and drag characteristics of the airfoil in oscillating motion. The shed vortices provide a low pressure region on the top surface of the airfoil throughout the period of oscillation, thus increasing lift of the airfoil. In particular, vortices formed and shed from the rear-most corrugation appear to have the largest effect. The pitch-down motion produces a lower absolute peak lift as compared the pitch-up motion which may be explained by the disruption of the high pressure zone on the top surface of the airfoil by a vortex forming in the corrugations. This results in a relatively lower high pressure region on the advancing side as compared to the pitch-up motion. In addition to the lift calculations, drag calculations indicate that net thrust is being produced during the oscillations and more thrust is produced on the pitch-up than the pitch-down motion.
Catalytic Hydrogenation of Oil Sand’s Natural Bitumen
Authors: Tileuberdi Yerbol , Ongarbayev Yerdos , Imanbayev Ye. , Mansurov Z. , Tuleutaev B. , Behrendt F. , Schneider I. , Khasseinov K.
Published: October 2015

In the paper catalytic hydrogenation of natural bitumen (NB) of Kazakhstan oil sands were investigated. The process provided under 350 bar of H2 pressure and a temperature of 430 °C. At the experiment activated carbon supported catalyst was used. It has 699.807 m2/g of surface area and 0.0635 nm of medium pore size. In the processes the yield of hydrogenated natural bitumen was 91%, including 1st fraction is 13.12 wt.%; yield of 2nd fraction increased, that the temperature range from 216 to 316 °С formed in amount of 45.68 wt.%; vacuum residue of the distillation takes the 41.20 wt.% in natural bitumen.
Study of the Wall Slip Effect on Viscous Fluid Micro-Extrusion Process
Authors: Chen Cong Ping , Wang Xiao Yun , Huang Jie Guang
Published: October 2015

In micro-scale flow condition, the flow rate and fluid extrusion expansibility are always affected by the wall slip between the fluid and tube wall. In this research, a wall slip model based on a micro-tube flow was developed, and then the wall slip effect on the viscous fluid micro-extrusion process was explored by computational fluid dynamics (CFD) with different extruding pressures. The results showed that wall slip make the fluid resistance and expansibility decrease, and the fluid mass flow rate increase.
Dynamic Prediction Method for Hydraulic Structure Concrete Strength
Authors: Tao Jia Xiang , Zhang Jun Rong , Cai Cun , Cui Gang , Lu Jun
Published: October 2015

At present, we usually obtain the prediction models of hydraulic structure concrete strength through lots of tests or engineering experience. But when we use the models to predict the concrete strength at a certain time , there may be some discrepancies with the actual value, even some unreasonable situations. During the service period of hydraulic structure, we can get some new information about the concrete strength by the means of safety testing, monitoring or experimenting. With reference to these new information, the Bayes dynamic prediction method can update the time-varying model of concrete strength mentioned above. This method can more accurately predict the concrete strength value of the next moment.
A Fatigue Life Simulation Analysis Method for Spot Weld Joints Considering Fatigue Crack Propagation
Authors: Lv Jun Cheng , Qian Tao , Song Kai , Qin Bing Heng , Ding Xiao Ming
Published: October 2015

A new fatigue life simulation analysis method for spot weld joints is proposed which considers the fatigue crack propagation from the point of fracture mechanics. The traditional fatigue simulation analysis methods for spot weld joints are mainly LBF method based on force and LMS method based on stress, while there exist some issues such as the prediction accuracy is not high, modeling and computational efficiency is low. A modular spot weld model is adopted in this paper, the node forces and moments around the spot weld are extracted through the finite element analysis, then a average stress intensity factor through the crack propagation path is calculated as the evaluation parameter of fatigue life. Shear fatigue test is designed for spot weld joints with two high strength steel materials (HSLA340GI and DP600GI) and four different thicknesses, then double logarithmic regression analysis is implemented between the average stress intensity factor and the fatigue life data of spot weld joints, then a matching curve is obtained as the fatigue life prediction curve for spot welds. Comparative analysis of prediction accuracy is implemented for these three methods, the results show that the prediction accuracy of fatigue simulation method for spot weld joints in this paper is higher than traditional LBF and LMS methods.
Application of the Conflict Detection of the Collaborative Design of the Automotive Powertrain System
Authors: Nguyen Thanh Cong
Published: October 2015

The collaborative design of the automotive powertrain system is a complex activity, which is involved with multiple disciplines and personnel for completion. Besides, characteristic of multiple goals and no specific operator, design process is inclined to collision, thus collision detection has become critical in collaborative design on the system. In the study, collision factors in the process of collaborative design on the system are analyzed and modeled and a section-based collision detection algorithm is proposed which is competent in detecting collisions in the process of clutch case design.
Mathematical Model of a Turbocharged Engine
Authors: Popelka Josef , Starý Petr
Published: October 2015

In this article I focus on a mathematical description of a turbocharged engine. After expressing the mathematical description I transferred it to the computer environment of a mathematical program. I further elaborated the results and compared them with the results of a simulation model of a turbocharged engine, which is also mentioned in the second part of the article.
Determination of the Impacts of Nanoparticule Additives into Diesel Fuel on NOx Emmision Characteristics of a Heavy Duty Diesel Engine
Authors: Özgür Ceyla , Özgür Tayfun , Özcanli Mustafa , Aydın Kadir
Published: October 2015

Transport is crucial for economic and social development of a society as it serves a key role for transportation of goods and people. But it is not free of negative externalities. Operation of transport vehicles require energy use and this energy is mostly generated with fossil fuel combustion. Unfortunately, the fossil fuel combustion comes with both global emissions (CO2, N2O, CH4), which cause climate change, and local emissions (PM, NOx, HC, CO, O3), which cause adverse health effects and damage natural environment. In this paper the level of NOx emission by adding fuel additive metal oxide based nanoparticles in heavy duty engines were investigated. Three different nanoparticle additives namely Titanium Oxide (TiO2), Silicon Oxide (SiO2) and Zinc Oxide (ZnO), were added to diesel fuel at the dosages of 15, 20 and 25 ppm. Eventually, the most proper additive and addition dosages were indicated.
Analysis of Engine Performance Parameters of Electrically Assisted Turbocharged Diesel Engine
Authors: Özgür Tayfun , Aydın Kadir
Published: October 2015

Charging system is used to increase the charge density. Supercharging system suffers from fuel consumption penalty because of compressor powered by engine output. Turbocharging system uses wasted exhaust energy that means compressor powered by exhaust turbine but has a turbo lag problem. The electrically assisted turbocharger which can eliminate turbo lag problem and fuel consumption penalty is the topic of this paper. The purpose of this paper is to analyze the effect of electrically assisted turbocharger on diesel engine performance parameters. The AVL Boost software program was used to simulate the electrically assisted turbocharged diesel engine. Simulations results showed that electrically assisted turbocharger increases low end torque and improves fuel economy.
Marine Diesel Engine Simulator for Self-Propulsion Test in Evaluating the Fuel Saving Rate
Authors: Sunarsih Sunarsih , Nur Izzuddin , Priyanto Agoes
Published: October 2015

As the vessel operates in the rough open seas, a marine diesel engine simulator which engine rotation is controlled to transmit through propeller shaft is a new methodology for the self-propulsion tests to track the fuel saving in a real time. Considering the circumstance, this paper presents the real time of marine diesel engine simulator system to track the real performance of a ship through computer-simulated model. A mathematical model of marine diesel engine and the propeller are used in the simulation to estimate fuel rate, engine rotating speed, thrust and torque of the propeller thus achieve the target vessel’s speed. The input and output are real time control system of fuel saving rate and propeller rotating speed representing the marine diesel engine characteristics. The self-propulsion test simulation results in calm water [7] were compared to validate the present marine diesel engine simulator. The present simulator then was used to evaluate the fuel saving by employing a new mathematical model of turbocharged marine diesel engine and was applied to a full scale target vessel. The control system developed will be beneficial for users as to analyze different condition of vessel’s speed to obtain better characteristics and hence optimize the fuel saving rate.
Numerical Analysis and Characteristics of Variable Displacement Swash Plate Type Compressor
Authors: Sang Seo Hyun , Cho Haeng Muk , Mahmud Md. Iqbal , Hai Wang Wen , Sarker Konica
Published: October 2015

Variable swash plate compressors recently have been used to improve fuel efficiency and SCM 435 or UNS C67300 were used as the material to manufacture them.As a result of structure analysis through static analysis that used ANSYS, SCM 435 currently being used was found structurally safe as it has that maximum stress is within the allowable range of their material property. Therefore, UNS C67300 was found to generate better fuel efficiency than the existing SCM 435 through structure analysis for automotive variable swash plate air conditioning compressor.
Manufacturing Technology of the Sensitive Elements for Gas Sensors Based on Dielectric Membrane Structures
Authors: Veselov D.S. , Voronov Yu.A.
Published: October 2015

The new fabrication method of dielectric membrane structures for sensitive elements of gas sensors, based on the separation of anisotropic etching of silicon into two stages, is proposed. The preference etchant compositions, the preference elemental composition of membrane films and the acceptable thickness of the thermal silicon oxide underlay to obtain mechanically relaxed membranes are presented. The group technology for manufacturing of sensitive elements for gas sensors is developed, membrane structures are fabricated and their properties are studied.
Development of a Human Upper Limb Volume Sensor for Biomedical Applications
Authors: Wang Long Tao , Yang Jiao , Zhang Xue Wei , Yuan Chao
Published: October 2015

Muscle volume is an important indicator for the strength of the muscle. Many biomedical scientists use the muscle volume as an index for the athlete muscle power and also the health condition of the patients with muscular problems. The purpose of this study is to develop a sensor to easily and accurately gauge human upper limb muscle volume for biomedical applications. The developed sensor has many advantages for protable measurement of the human limb volume.
The Blemish Identify in Ultrasonic Testing of Friction Welded Joints Based on Fractal Theory
Authors: Liu Yuan Peng , Yin Xin , Wang Min
Published: October 2015

The friction welded joints made by GH4169 heat metal alloys are detected by U1traPAC system of the ultrasonic wave explore instrument. Aimed at the blemish signal characteristics, a method is put forward to identify the blemish signal in ultrasonic testing of friction welded joints based on fractal theory., A new kind of fractal dimension number calculation method—normalized scale box-counting dimension method is used to calculate the box-dimension of the blemish signal, and statistic and analysis the scopes of the box-dimension of the blemish signal and the square differ of the result. The preliminary experimental results show that the blemish signal and have each fractal dimension zones, and don’t hand over to fold. So it can use to judge whether the blemish exist or not. The method is identified to have better covariance characteristics about the blemish identify of the friction welded joints.
Design of a Device to Eliminate Isocyanuric Acid from Water
Authors: Corral Bobadilla Marina , Vergara Gonzalez Eliseo P. , Lostado Lorza Ruben , Somovilla Gomez Fatima , Fernandez Martinez Roberto
Published: October 2015

This paper shows the design of a device for partial eliminating of isocyanuric acid (ICN) from swimming pool water using melamine additives. The renewal process of swimming pool water through its own purification makes absolutely necessary the elimination of isocyanuric acid that has been accumulated in the water over time. An excess of isocyanuric acid in water will then prevent chlorine effectiveness in the pool water and as a result, becomes harmful to human health. Therefore, the disinfection stage is considered as well as Isocyanuric acid (ICN) stabilization and as doing this is achieved through melamine-photometry filtering of insoluble complex ICN-M. The overall objective of these stages of purification is to eventually eliminate ICN from swimming pool. The overall objective of this device is to eventually eliminate ICN from swimming pool and then make it safe for human uses, a case that has been considered viable technologically and economically in the system treatment.
Laser-Inertial Aided 3D Scanner Using Geometric Invariant for Terrain Construction
Authors: Achmad M.S. Hendriyawan , Daud Mohd Razali , Pebrianti Dwi , Razali Saifudin
Published: October 2015

Researchers in robotic vision technology are facing larger challenges, where the 2D technology has flaws in complex robot navigation in 3D space. Using 3D scanner, the robot is able to get a more detailed terrain construction, making it easier to carry out its tasks. The 3D image is obtained by fusing the Hokuyo URG-04LX and the 6-DOF IMU that consists of acceleration sensor and gyro sensor. IMU sensor outputs are the angle, speed, and position in 3D. Nevertheless, just the value of the angle is used in this study to construct 3D images based on geometric invariant. To reduce the interference in the sensor output, two types of filter are applied; the Gaussian filter used on the output of 2D LRF, while the complementary filter is applied to the output of the IMU sensor. Angle measurement plays an important role in term of geometric invariant for terrain construction. The complementary filter has provided the best angle measurement results with the lowest error on time constant (τ) = 0.475s and sampling time (dt) = 10ms. Thus, the proposed systems have successfully made an obvious 3D image of the terrain in the indoor testing.
Damage Detection in Structures Using Electromechanical Impedance and Finite Element Analysis
Authors: Djemana Mohamed , Hrairi Meftah
Published: October 2015

Impedance-based structural health monitoring (SHM) techniques have been developed as a promising tool for real-time structural damage assessment, and are considered as a new non-destructive evaluation method. It is gaining popularity due to its potential of reducing maintenance costs while increasing safety and reliability. This article present the results of Finite Element analysis performed for aluminum beam with bonded piezoelectric transducer (PZT). Modeled structure was excited to vibrate at high frequency range and electromechanical impedance (EMI) plots were obtained from the harmonic analysis. Notches were introduced in the beam and the damage metrics were used to asses qualitative changes in structural properties of the system. Furthermore, a parametric study of the effects of different variables was carried out. The numerical results show a good agreement was observed.
Influence of Process Conditions on the Local Shrinkage and on the Pressure Evolution inside the Mold Cavity of the Injection Molded Polypropylene in Two Modifications - PP Homopolymer; 40 % Talc Filled PP
Authors: Záboj Robert
Published: October 2015

This work is focusing on optimization of the chosen process conditions (melt temperature, injection rate and holding pressure) and their mutual interaction on the local shrinkage of wall thickness carried out on rectangular plate. The test was applied on semicrystalline polymer in following modifications - polypropylene homopolymer and 40 % talc filled polypropylene. For better understanding of processes influencing shrinkage the pressure evolution inside cavity was captured by transducers placed near the gate and at the end of flow.
Homogeneity of Aluminum Castings and Dependency on Increasing Pressure
Authors: Gaspar Stefan , Pasko Jan
Published: October 2015

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. In the process of die casting the final quality of a cast is influenced by a great number of factors. The main factors of die casting are: pressing velocity, increase pressure, the melt temperature and the mold temperature. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence in castings correct setting technological factors of die casting. The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.
Diagnostics of Material Properties of Steel Sheets from the Tensile Test Record
Authors: Kmec Jozef , Fechová Erika
Published: October 2015

Nowadays it is not possible to predict material properties such as stampability and their behaviour during pressing at certain conditions without computer simulation. Reliability and accuracy of the results of numerical simulation depend on accuracy of used material model and completeness of input material parameters. The paper mainly deals with diagnostics of material properties of steel sheets from the tensile test record.
Adhesive Bonding Joints of Coating with Zn/Mg Layer on Sheets for Car-Body Panels at Temperature Loading
Authors: Kolnerová Michaela , Sobotka Jiří , Solfronk Pavel
Published: October 2015

The paper deals with the monitoring of utility properties of new coating type on the basis of Zn/Mg (ZM). For the comparison there was used commonly used coating in the series production of car-body panels on the basis of zinc (Z100). Measured results markedly contribute to improve production systems of car-body adhesion bonding on the basic of performed evaluation of applied coatings types utility properties quality with regard to influence of temperature and corrosion environment. Testing was carry out by T-peel test acc. to ISO 11339 when such type of loading represents crucial bonding fracture type. Thus results reveal information about behavior of adhesive joints strength properties together with the type of fracture as a criterion for suitable application of new coatings types on the basis of Zn/Mg and their implementation into series production of automobiles.
Evaluation of Vibration Parameters under Machining
Authors: Panda Anton , Prislupčák Marek , Jurko Jozef , Krenický Tibor , Jančík Marek
Published: October 2015

AWJ abrasive water jet belongs to the unconventional methods of machining. Waterjet offers a number of advantages over other cutting methods. There is no heat or chemical material damage, high accuracy and precision, the ability to cut any material and others. Despite many advantages of AWJ has some technical elements that can be improved and optimized. This article deals with effect of vibration on the technological head and consequently wears. The aim of the experiments is to find the most appropriate feed rate, which extends the life of the technological head.
Evaluation of T-Vc Dependence for the most Commonly Used Cutting Tools
Authors: Duplák Ján , Panda Anton , Kormoš Miroslav , Pandová Iveta , Jurko Slavko
Published: October 2015

The main part of Standard ISO 3685 isT-vcdependence for various cutting materials. The Standard ISO 3685 contains main properties and characteristics for three most important cutting materials those are used in engineering practice. Durability is very important property of every cutting material. This property of cutting materials defined theirs life-time. The standard ISO 3685 prescribes instructions to creation ofT-vcdependence for defined cutting materials. Paper describes process how to defineT-vcdependence for the most commonly used, because were found deficiencies in valid standard ISO 3685.
Dynamics of Treatment Device for Die Casting of Metals
Authors: Ružbarský Juraj , Majerník Rastislav , Hrabě Petr , Valášek Petr
Published: October 2015

The aforementioned proves that the grease flow in mould treatment equipment can be regarded as a regulation system with the input quantity by medium pressure p1 above the grease level and with the output quantity by the grease flow speed.The utilization of treatment equipment for die casting of metal enhances both the working environment and work culture during die casting of metals. Application of grease flow regulation results in better repeatability of die casting cycle which positively influences the quality of castings.
Real Time Pressure Control in Pneumatic Actuators
Authors: Šmeringai Peter , Rimár Miroslav , Fedák Marcel , Kuna Štefan
Published: October 2015

This paper explains the design of real-time control system for drives which use a pneumatic artificial muscles. Described is the design of hardware and software equipment, as well as design of these components involvement in the experimental facility with artificial muscles. In this paper are referred experimental measurements on the device aimed at monitoring the changes in observed PAMs characteristics caused by pressure changes in artificial muscles during their operation.
Application of Sliding Guides to Feeder Device in Aggressive Environments
Authors: Svetlík Jozef , Demeč Peter
Published: October 2015

The article deals with the renovation of an automatic feeder device into an industrial washing machine that removes dirt, residues of cutting oil and coolant after previous machining. The old feeding device showed frequent disturbances. It was therefore necessary to propose a solution that would eliminate common failure. The choice is sliding guides to resulted mainly from the summary of the factors resulting from aggressive environments at the application site and the presence of minor impurities after previous machining.
Action on Crane Runway Caused by Horizontal Forces due to Crane Skewing
Authors: Hrabovský Leopold
Published: October 2015

Determination of the (residual) lifetime of steel structures of construction, mining and maintenance machines has recently received increased attention, particularly for safety, environmental and economic reasons. One of the problems that are addressed in this context is crane skewing, a phenomenon that directly affects, through friction and wear, the life of the crane guiding structure, and indirectly affects the secondary life of the crane supporting structure.
Applying of Automatic Laser Particle Counter as Technique to Morphology Assessment and Distribution of Wear Particles during Lifetime of Transmission Oils
Authors: Kučera Marián , Aleš Zdeněk , Pavlů Jindřich , Hnilicová Michaela
Published: October 2015

Vast part of environment pollution is caused by the lubricants. Lubricants are mostly of mineral origin. They are toxic and not easily biodegradable. Transition to biodegradable oils involves several technical issues. During the operation of machines and equipment wear occurs due to formation of particles that pollute the lubricant fillings. Cleanliness of the oils in lubrication systems is an important prerequisite for maintaining the operating conditions of machines and equipment.The aim of this article is to evaluate distribution of wear particles of tested transmission oil samples via automatic laser particle counter and classifier LaserNet Fines-C which is highly accurate and a fully automated tribotechnical diagnostics device.
Dynamic Model of the Test Station for Gear Drives Dynamic Tests
Authors: Šmeringaiová Anna , Šmeringai Peter
Published: October 2015

The contribution deals with the issue of the experimental assessment of the dynamic behaviour of the gear drives. The objective is to design and to realize the experimental station for dynamic tests of gear drives in an accelerated mode. Described is the idea of the experimental station design, the procedure of creating its mathematical model and the model for computer simulation.
Two Component Parts Hardness Optimization Regarding Production Systems
Authors: Habr Jiří , Bobek Jiří , Lenfeld Petr , Bĕhálek Luboš , Seidl Martin
Published: October 2015

This paper deals with optimization of mechanical properties mainly hardness and stiffness of flexible part of two component injection molded part regarding production systems. Optimization is performed on two material combinations: Thermoplastic - thermoplastic elastomere and thermoplastic - silicone. Polymers used for two component part are suitable for medical applications.
Quality Assessment of Machined Surfaces by an Optical Profilometer
Authors: Gerková Jana , Straka Ľuboslav
Published: October 2015

Technological parameters affecting the surface quality of cutting edges in production system with the AWJ technology include cutting head movement speed. The article examines and evaluates the quality of processed surface by the AWJ technology on selected materials as related to the change of cutting head movement speed. It was discovered that the movement speed for the AWJ technology has a significant effect on the surface quality
Differential Scanning Calorimetry as a Tool for Quality Testing of Plastics
Authors: Bĕhálek Luboš
Published: October 2015

Differential scanning calorimetry (DSC) is the most frequently used method from thermal analysis to characterize plastics and which can be applied not only in the R&D but also in the industrial praxis as input and output control. This paper deals with the most important DSC application which arises from results of applied and contractual research at Technical university of Liberec. In the paper are introduced examples of its utilization for plastics identification and characterization, for analysis influence of plastics processing process parameters on their quality, to describe crystallization kinetics and so on.
Innovation Map in the Process of Enterprise Evaluation
Authors: Kaczmarska Bożena , Gierulski Wacław
Published: October 2015

This paper presents amethod for evaluatingthe innovation of enterprisesusing quantitative measures. It is applicable to detailedstudies in the process of forecasting and is an instrument for assessing individual companies. Itprovides knowledge that is useful for making“maps of innovation”and devising strategic plans for the development of states and regions. Enterprise innovation is assessed within two coupled functional groups ─ technologicaland intellectual─using a six-level scale.The results of evaluation are presented graphically with a structure called the“map of innovation.” This structure, as a measure of the intensity of various forms of innovative activities, is determined in each functional group.
Manufacturing Systems Building and Developing
Authors: Valencik Stefan , Stejskal Tomas , Kmec Ján , Bicejova Luba , Gombar Miroslav
Published: October 2015

The paper presents a complex of information aimed at automated production systems structures and simulation. For production systems intergrated structures formation it uses logistic principles for making the internal material flow among various logistic nodes more precise and effective, including respective information flow, here e. g. with use of integrable and compatibile handling and technological systems, as well.
Analysis of the Model Application of Mechanical Equipment for Hydrothermal Treatment at Biogas Plant
Authors: Junga Petr , Trávníček Petr , Ružbarský Juraj
Published: October 2015

The goal of the paper was to analyse model applications of mechanical equipment for hydrothermal treatment. Alternative 1 was an alternative with a treatment output of 14 500 Mg of processed material, the annual electricity and heat total production of 4000 MWh respectively 3800 MWh, total capital expenditure of 40 000 000 CZK, unit capital expenditure of 2759 CZK per 1 Mg of processed biodegradable material and annual operating expenses of 19 371 000 CZK. The net present value (NPV) is 1 061 000 CZK, the internal rate or return (IRR) totals 4.9%, the simple payback time (Ts) is 12.6 years and the discounted payback time (Tsd) is 19.2 years. Alternative 2 employing the mechanical equipment proved a potential increase in the treatment output to 18 125 Mg, and an increase in the electricity and heat total production to 5000 MWh respectively 4800 MWh, thanks to the shortened intensification of the anaerobic fermentation process. At the same time, the total capital expenditure rose to 43 000 000 CZK, the operating expenses rose to CZK 24 213 000. The unit capital expenditure of alternative 2 amounts to 2372 CZK per 1 Mg of the of processed biodegradable material. The NPV totals 8 329 000 CZK, IRR is at 6.7%, the simple payback time (Ts) is 10.8 years and Tsd totals 15.3 years.
Proposal of the Knowledge Application Environment of Calculating Operational Parameters for Conventional Machining Technology
Authors: Baron Petr , Dobránsky Jozef , Pollák Martin , Cmorej Tomáš , Kočiško Marek
Published: October 2015

Calculation of the machining parameters is one of the basic routine operations carried out before initializing the work and technological operations on a machine tool. Basis for calculating these parameters is obtained from the technical documentation in the form of rules, tables, catalogues and company literature. It can be concluded that this is a routine activity which represents a significant proportion of the activities performed before actual production of the product. It is exactly the routine activities that are possible to underpin and process well with the help of computers and appropriate application equipment. This contribution describes the design and implementation of a knowledge based system of calculation of the processing and operational machining parameters with the possibility of parameter correction with regard to specific technological equipment. The result is the obtaining of an optimal machine setting for machined range of products with a consideration for the production efficiency, durability of the cutting tool and the possibility of reusing the archived operational parameters.
Effect of radionuclide activity concentration on PET-CT image uniformity
Authors: Hasford Francis , Wyk Bronwin , Mabhengu Thulani , Vangu Mboyo , Kyere Augustine , Amuasi John
Published: October 2015

Assessment of radionuclide activity concentration on positron emission tomography-computedr tomography (PET-CT) image uniformity has been carried out quantitatively. Tomographic PET-CT images of cylindrical phantom containing F-18 fluorodeoxyglucose (FDG) activity concentration was acquired and used for the assessment. Activity concentrations were varied and PET-CT images were acquired at the constant acquisition parameters of time, matrix size, and reconstruction algorithm, respectively. Using midtransaxial image slices, quantitative index of nonuniformity (NU), and coefficient of uniformity variation were estimated for the different activity concentrations. Maximum NUs of 17.6%, 26.3%, 32.7%, 36.2%, and 38.5% were estimated for activity concentrations of 16.87 kBq/mL, 14.06 kBq/mL, 11.25 kBq/mL, 8.43 kBq/mL, and 5.62 kBq/mL, respectively. The coefficient of uniformity variation established an inverse quadratic relationship with activity concentration. Activity concentrations of 16.87 kBq/mL, 14.06 kBq/mL, 11.25 kBq/mL, 8.43 kBq/mL, and 5.62 kBq/mL produced uniformity variations of 1.47%, 2.52%, 4.23%, 5.12%, and 4.98%, respectively. Increasing activity concentration resulted in decreasing coefficient of uniformity and hence, an increase in image uniformity. The uniformity estimates compared well with the standards set internationally.
The influence of antithyroid drug discontinuation to the therapeutic efficacy of 131 I in hyperthyroidism
Authors: Kartamihardja A. Hussein Sundawa , Massora Stepanus
Published: October 2015

The influence of antithyroid drugs (ATDs) on the therapeutic efficacy of radioactive iodine in hyperthyroidism is still controversial. The aim of this study was to evaluate the effect of ATD discontinuation to the therapeutic efficacy of I-131 in hyperthyroidism patients with long-term ATD treatment. Retrospective study was done to 39 subjects with hyperthyroidism who had been treated with doses of 300 MBq radioactive iodine. The subjects were divided into three groups: Group I (n = 14) had been using ATDs for more than one year and discontinued more than three days; group II (n = 14) had been using ATDs for more than one year but discontinued only for three days or less, and group III (n = 11) has never been used any ATD before radioactive iodine treatment. There was a significant difference in the therapeutic efficacy after three months of radioactive iodine treatment between group I and group II (P = 0.018), group II and group III (P = 0.017), but not between group I and group III (P = 1.0). There was no observed difference on the therapeutic efficacy between the three groups at 6 months after radioactive iodine therapy (P = 0.143). Administration of ATDs more than 1 year without discontinuation decreased response of radioactive iodine treatment in 3 months follow-up. Discontinuation of ATDs for more than 3 days before radioactive iodine treatment is recommended.
Outcome of Radioiodine Therapy in a West African Population
Authors: Onimode Yetunde , Ankrah Alfred , Adedapo Kayode
Published: October 2015

Hyperthyroidism continues to be a pressing public health concern in West Africa. Its prevalence in Africa has been quoted as 1.2%-9.9%, with Graves' disease as its most common cause. Radioiodine-131 (RAI) therapy of hyperthyroidism recently commenced in two government hospitals in Ghana and Nigeria. This is a retrospective analysis of consecutive patients treated with RAI for primary hyperthyroidism at the National Centre for Radiotherapy and Nuclear Medicine (NCRNM) from 2008-2013, and in the University College Hospital (UCH) from 2006-2013. Cure was defined as euthyroidism or hypothyroidism occurring at 6 months post-RAI. Data were analysed using SPSS version 21 and Epi Info version, categorical data were evaluated with the Chi-square test and Fisher's exact test. 94 patients were studied, aged 20-74 years; 78 were females, and 16 were males. 38 were Ghanaian and 56 Nigerian. The presence of thyroid-associated ophthalmopathy (TAO) made cure less likely (χ2 P = 0.006, odds ratio = 0.118; 95% confidence interval, 0.027-0.518). Other factors assessed proved to be insignificant. Our findings suggest that hyperthyroid patients with TAO will benefit from a higher RAI dose than their counterparts without TAO.