bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of the electric discharge and the power supply on the aqueous solution interface parameters
Authors: Lungu C V , Hnatiuc B 
Published: August 2019

Abstract
Laboratory electrical discharges that produce non-thermal plasma are used more and more for microbiological decontamination, surface treatment and depollution by the means of decomposing some complex molecules or in the field of modern medicine. Each application requires a power supply particularly adapted to the plasma reactor type used. If the first applications of these discharges were designed mostly for reactor types with high volume discharge capabilities, and the power supplies were simple and robust generating high power using industrial frequencies, in time the reactors decreased significantly in size and the power supplies used were working on higher frequencies. This trend was adopted on one hand out of the need for energy optimization of the power supplies used, and on the other hand for obtaining a better homogeneity of the treatment. This paper aims to provide a comparison of few AC and pulsed power supplies, working at different frequencies, with respect to the electrical parameters, from the point of view of active species production. The measured electrical parameters of the electrical discharges are the power and the specific energy. Also the results obtained for treatment of distilled water using three types of plasma reactors (classic GlidArc, Mini-torch plasma and Gliding Spark) will be shown. The analysis focus on the modification of pH of the distilled water in time after the plasma treatment.
The use of the NX mechatronic module to simulate of a simple machine work
Authors: Lysek K , Gwiazda A , Herbus K 
Published: August 2019

Abstract
Mechatronic is combination of three main disciplines like mechanic, electronic and theory of control. CAD/CAM systems is part of them. The aim of this article is to describe how to use CAD system (NX Siemens) with mechatronic module to designee simulation process. That module allows to resolve problems from mechanical, electrical and automation discipline. As an example author creates simple machine using this module. That aim was established in that form has been obtained. The created simulation is working and allowing to resolve mechanical robot’s problems. The simulation was based on kinematics parameters of robot. The article is the introduction to further work on the use of the Mechatronics module to perform the most real simulation of the Fanuc ARC Mate 100iB industrial robot.
Determination of material constants for high strain rate constitutive model of high entropy alloys
Authors: Matache L C , Lixandru P , Chereches T , Mazuru A , Chereches D , Geanta V , Voiculescu I , Trana E , Rotariu A N 
Published: August 2019

Abstract
The paper deals with constitutive models determination for a group of high entropy materials (coded Bl-x). The procedure includes the following steps: experimental determination of mechanical characteristics for quasi-static domain through compression tests, correction of experimental data of quasi-static tests using numerical simulation, acquisition of experimental data obtained on the Split Hopkinson Pressure Bars and their simulated interpretation. Using the processed data, the constitutive patterns of the materials under investigation are drawn. The experimental data correction for quasi-static tests performed using numerical simulation involves drawing the engineering stress/strain diagram, the transition to the plastic characteristic diagram in the hypothesis of perfectly cylindrical shape of the specimen throughout the test, simulation of the compression deformation process in the presence of friction force on the end specimen surfaces and the correction of the characteristic plastic diagram using the calculated error. Dynamic data obtained on Split Hopkinson Pressure Bar were interpreted using a methodology previously published. Experimental data under real conditions are compared with data obtained by numerical simulation on an elasto-plastic model. The viscous component of the dynamic response is the difference between the real and simulated on the elasto-plastic model responses.
Determination of a methodology for formulating constituent models of high entropy alloys
Authors: Matache L C , Chereches T , Lixandru P , Mazuru A , Mitrica D , Trana E , Somoiag P , Rotariu A N 
Published: August 2019

Abstract
A program, based on static and dynamic regime tests and correspondent numerical simulations, was conceived to be appliedfor high entropy alloys mechanical characterization. The objective was to establish a combined experimental & numerical methodology for dynamic characterization of high entropy materials in high strain rate processes. The results of static tests were used to draw the characteristic diagrams of the real material. Based on the results obtained in the compression test, a numerical simulation was performed and a material constitutive model was determined in quasi-static conditions by an iterative process. In the formulating process of constitutive equations for high entropy materials, the dynamic experimental results obtained on SHPB were interpreted using similar simulated numerical models. The methodology conceived in this paper is applicable in materials science for the determination of the constitutive models of new materials.
The frictional contact of coated bodies. Part II – The slip-stick contact
Authors: Spinu S , Cerlinca D , Musca I 
Published: August 2019

Abstract
Fretting is a special wear mode that occurs in a contact subjected to minute relative motion by vibration or other perturbations. The solution of the slip-stick elastic contact is required to address the problem of tractions and stresses arising in a fretting contact. This solution may be particularly difficult to obtain for coated bodies, considering that, unlike the case of homogenous materials, the response of layered materials to unit load has not yet been expressed in closed form. However, explicit expressions, also known as the frequency response functions, have been derived in the Fourier transform domain. Considering that displacement and stress calculation in an elastic contact process yields convolution products arising from superposition of effects, the existing frequency response functions can be used to calculate the response of layered materials directly in the spectral domain, and subsequently transferred to the space domain. Once a method for elastic displacement calculation in layered materials is made available, the slip–stick elastic contact problem can be solved in the same manner as for homogenous materials. The contact problems in the normal and in the tangential direction are coupled, as opposed to the sliding contact model. The numerical solution allows for identification of the slip and stick regions, and of the corresponding contact tractions. The latter tractions can be subsequently used to assess the stress state in the coated body, and thus to formulate competent design decisions.
Statistical control of forming process
Authors: Teodor V G , Paunoiu V , Carausu C , Baroiu N , Costin G A 
Published: August 2019

Abstract
A qualitative product must be obtained through a stable and repeatable process. In order to control a defining characteristic of the quality of a specific product, various specific methodologies have been developed in time. One of the most known methods of this kind is the statistical control of the process which provides users with a powerful and useful range of tools designed to ensure process stability and improve capacity by reducing variability. These tools have the following great advantages: they are simple to use; are effective and can be applied to all processes. This paper presents a software application designed to conduct a forming process by the statistical control method. The program analyzes a database of measured values of the traceability characteristics and identifies whether these values have a statistically normal distribution. In the affirmative case, the main statistical indicators of the considered sample are calculated: maximum and minimum values, amplitude, average value, median, dispersion, process control limits and process capability index. These statistics are displayed both numerically and graphically. By using the software, it is possible to track the process and, if exists the tendency to overcome the control limits, to change the process parameters that caused the change in the quality characteristics.
Programming and wireless control of a wafer manipulation SCARA robot using a mobile device
Authors: Coman G C , Stan L , Ivan A M , Nicolescu A F , Verdete B 
Published: August 2019

Abstract
The research performed by the authors had the purpose of developing a control and programming application for a 3-axes SCARA robot designed for wafer manipulation and integrating it with a mobile device capable of wireless communication. The mobile device was then used to command axis movements, internal signals and for programming. The application was developed as a user-interface capable of communicating with robot’s controller and converting the user inputs into controller commands. In order to achieve position control, the direct kinematic model of the robot was developed. Furthermore, the application was integrated with the V-REP virtual simulation platform in order to achieve simulation and offline programming capabilities - the V-REP software provided the 3-D environment and the kinematics modelling functions required to perform the simulation while receiving commands from the developed application. Finally, a few demonstrative applications were configured in order to test the functionality of the system. The research has important implications in the field of industrial wireless communication, being a step towards more flexible robotic applications, full integration of remote operation technologies and easier access to remote production facilities.
Virtual prototyping, physical structure development and PC control of a double arm (five link) SCARA robot
Authors: Coman G C , Serban C , Ivan A M , Nicolescu A F 
Published: August 2019

Abstract
The research presented in this paper is linked to parallel kinematics robots, their performances evaluation and analysis of their integration opportunity at industrial level. Along this research a double arm SCARA robot (including planar parallel kinematics of a 5 links / 2 DOF mechanism) was developed. The first stage of the project consisted of robot physical structure 3D modelling. The second stage of the project was oriented towards kinematic modelling of robot’s mechanism. Next, in the third stage of the project the real robot was built, including the mechanical structure, the sensorial and electrical driving system for the planar mechanism, the pneumatic driving system for the vertical axis and the vacuum gripper. The fourth stage of the project consisted of configuring the robot controller so that it could be programmed and controlled through a PC. This implied the establishment of communication protocols between the robot’s PLC and the PC, the development of the programming & control software interface for PC robot control. Using this interface, the robot was programmed to perform a pick-and-place application. In the final stage of the project the repeatability of the robot was measured in order to evaluate the accuracy characteristics of robot’s parallel kinematic structure.
Influences of the circular economy in industrial engineering
Authors: Botezatu C , Oroian B , Hrituc A , Condrea I 
Published: August 2019

Abstract
Epoxy resins are some of the best-performing resins currently available on the industrial market. By adding additional filler materials (glass, porcelain), the epoxy resin acquires superior mechanic and thermal properties. The areas in which epoxy resins are used are multiple: metal coating, electronics and electrotechnics, manufacture of paints and adhesives, obtaining plastics with special properties or in construction. Epoxy paints are used indoors because they are UV-sensitive (they get the appearance of chalk) on the outside. However, they are very good as corrosion-resistant primer and very good protection against water and humidity. That is why they are used as a first layer in the automotive or shipbuilding industry. Epoxy adhesives are very resistant and are used in many areas: airplane, car, bicycle construction. Therefore, when making the frame to pour a resin, it should be taken into account that there are few materials that do not stick very well.
The impact of open innovation on product development: innovation versus creative ecosystems
Authors: Bujor A , Avasilcai S , Hutu C A , Avram E 
Published: August 2019

Abstract
Developed business ecosystems exhibit open innovation as the most relevant booster of organizational development. Also, from a combined approach to innovation perspective, using collaboration among different stakeholders in order to achieve competitive advantages, open innovation serves as an important technique for new business model creation. Thus, it is especially important to enhance the impact of open innovation on organisational processes as the main driver for organizational higher performance and development. Based on literature review this paper aims at exploring the main transition from product development processes to co-creation products through implementation of open innovation, in highlighting key differentiating aspects by different types of ecosystems. Consequently, a comprehensive framework for co-creation processes in innovation and creative ecosystems, in terms of product development stages, is provided based on specific adopted criteria, emphasising the open innovation impact within innovation versus creative ecosystems.
Assessment of an accident risk into an industrial building site
Authors: Cojocaru D , Solomon Gh , Dijmarescu M C 
Published: August 2019

Abstract
Starting from the concept that the industrial construction represents a work system with four defying components such as the executant, the workload, the means of productions and the work environment, the collective protection systems for the principal categories of activities, which are ongoing into the industrial building sites, must be analyses and evaluated. The work accidents risks and occupational illness are and they will be present all the time in the industrial building sites. The problem of prevention specialists consists in the way in which the organized and implemented measures are applied and made effective, in order to avoid the occurrence of events or, at least, to mitigate their consequences for the jobs in the industrial sites. Of the specific activities frequently encountered in temporary construction sites, the construction and assembly of metallic structures for the strength and elevation of buildings is highlighted, where there is a large and complex exposure to the risks of injury and also to professional illness. This paper presents a complex evaluation of accidents risks in a construction site for a mechanical locksmith stationary metal structures.
Device for the study of the friction coefficient in the bolt-chain link joint
Authors: Gavrila C C , Lates M T 
Published: August 2019

Abstract
The friction which appears in chain drives has an importantinfluence on their dynamic behaviour, wear and lifetime. The most significant friction and also wear is given by the bolt and chain link joint; in most of the cases this led to changes of the chain geometry and failures. Due to this, the study of the friction in the chain joints is required, but also difficult because of some particularities, as bolt and chain link reduced dimension, the oscillate motion in joint, chain link load.The paper presents a device for the friction coefficient study in the chain link-bolt joint, according to the mentioned requirements. First, the device ensemble 3D model is presented; the geometrical and kinematical restrictions between the parts are also defined. Then, the finite element analysis on this model is realized and is achieved for different initial conditions. In the paper final part, the analysis results and conclusions are presented.
Lean Learning Factory at the University of Pitesti
Authors: Nitu E L , Gavriluta A C 
Published: August 2019

Abstract
Today, the globalization of production and strong competition in the automotive industry requires manufacturers to offer their customers a wide range of products of the best quality and at lower prices. In order to accomplish this objective, the production systems must be as flexible and responsive to customer requests as possible and the production flow should be uniform. The usage of the most modern methods, techniques and tools, such as modelling and simulating production flows and Lean manufacturing, in the layout planning, work organization and production management is imperative to such production systems. In this context, at the University of Pitesti, a Learning Factory has been in development, that facilitates the research in laboratory conditions of modern manufacturing methods and their transfer to factories from automotive industry. The laboratory was developed within a research project and includes integrated research and teaching platforms, specific to layout design, modelling and simulation flows and Lean manufacturing, while also comprising elements of digitalization (Industry 4.0). The Lean Learning Factory at the University of Pitesti is in a continuous developing process which will allow students to enrich their practical skills and competencies concerning modern methods, techniques and tools, by using factory-like equipment. Moreover, this laboratory can also be accessed by automotive companies’ employees from Arges County to improve their abilities in Lean manufacturing.
A methodology for intelligent monitoring the vibrations of an asynchronous motor
Authors: Popa V , Popa L 
Published: August 2019

Abstract
This paper presents an intelligent methodology for diagnosing incipient defects of rotating machines and is focused on monitoring the vibrations of an asynchronous motor. Monitoring of industrial plant operation parameters requires the acquisition of many electrical and non-electric parameters, parameters that can be monitored with powerful software. The technical state of operation of an industrial machine can be judged based on the symptoms it exhibits during operation, in our case the vibrations. Vibration analysis that occurs during engine operation may indicate electrical defects, such as broken rotor blades, unbalanced stator circuits, eccentric rotors and stators, loose power connections. There are mechanical defects and electrical faults in the vibration spectrum. A web application has been created to facilitate the interpretation of the linear spectrum resulting from the vibration monitoring of an asynchronous motor and to be accessible to any user. There was developed an application with Microsoft Silverlight, a software platform that allows us to display advanced multimedia content from a web browser. The spectrum reproduced by the application is simple, precisely to be accessible to everyone and to know very easily whether the machine is working correctly or not.
URANSE simulation for the Seakeeping of the KVLCC2 Ship Model in Short and Long Regular Head Waves
Authors: Bekhit A , Lungu A 
Published: August 2019

Abstract
In the present study, the vertical motions and the added resistance in waves of the KVLCC2 ship model are predicted numerically in regular head wave, for a single wave height and different wave lengths, including long and short waves. The numerical simulation is performed by making use of the ISIS-CFD solver of the commercial software FineTM/Marine provided by NUMECA, where the discretization in space is based on finite volume method using unstructured grid. The unsteady RANSE are numerically solved, while the turbulence is modelled by making use of the k-ω SST model. The free-surface is captured through an air-water interface based on the Volume of Fluid method. For validation purposes, the computed solutions are compared with the available tank test data existing in the public domain. A systematic grid convergence study based on Richardson Extrapolation method is performed for a single wave case on three different grid resolutions, as an attempt of predicting the uncertainties in the numerical solution. A thorough investigation for the free-surface topology at different encountering moments is also presented to prove not only the accuracy of the solver, but also its robustness.
Barge’s study under impact loads
Authors: Nechita M , Mocanu C I 
Published: August 2019

Abstract
The aim of this paper is to present a method of increasing the safety of inner water navigation. It concern on improving the structural resistance of a barge during design process. Numerical structural analyses of the deck and the board are purposed to solve the problem. Different values of friction coefficient steel on steel are considered as input data. Naval structure’s behaviour is analysed using the area and the volume values of the struck surfaces. The post-processing of data shows an influence of the friction coefficient on Von Misses stress of the deck’s structural components. This method also allows evaluation of the barge damages.
Improving the hydrodynamics performance of the catamaran passenger
Authors: Pacuraru F , Mandru A 
Published: August 2019

Abstract
Interest in medium and high-speed marine transportation has acquired a wide variety of research on catamaran hydrodynamics. The demand for high-speed small ship has increased in last period, especially for the passenger ferry boat. The paper considers the assessment of the free surface flow around the hull of the catamaran passenger ship in order to improve its hydrodynamics performance. To accomplish the objective, Computational Fluid Dynamics based on RANS-VOF solver have been used. The free surface treatment is multi-phase flow approach, incompressible and non-miscible flow phases are modelled through the use of conservation equations for each volume fraction of phase. To evaluate the effect of the central bulb positioned between the hull bodies on the ship resistance, nine different sets simulations were carried out for eleven speeds corresponding to Froude numbers between 0.12 and 0.80. Nine different configurations of the bulb considering three different depth and three position along the hull (bow, midship and stern) have been considered. The calculations revealed that wave resistance can be reduced by using a central bulb between the catamaran hulls by up to 8%. This happens when the bulb is positioned at the bow and the stern and for Froude numbers 0.3-0.6.
High-order calculation of triboelectric charge density using a transition matrix element in a triboelectric nanogenerator system
Authors: Kim SeongMin 
Published: August 2019

Abstract
The second-order calculation for triboelectric charge density (σ
tribo) between a metal and polymer is performed analytically based on the molecular-ion-state model. The transition matrix element ∣MAB∣ is approximately calculated for two cases where the distance between metal and polymer is very small (d ≪ 1) and the electronic energy is near the Fermi energy level (EF) because electron transfer between metal and polymer is dominant at this level. The σ
tribo approaches zero-order approximation as d approaches zero. Thus, although d is very small (d ≪ 1), its effect as a second-order approximation, such as dielectric constant and dielectric thickness, is shown here.