Machines. Technologies. Materials.
Vol. 9 (2015), Issue 2

Table of Contents

  • INVESTIGATION MODELS FOR VEHICLE DIRECTIONAL STABILITY- I part

    pg(s) 3-6

    The vehicle directional stability depends on various factors, such as tire construction, their lateral stiffness, the rapport HL, the pressure and etc. The study presents a research of the influence of lateral stiffness of the suspension system and tire on vehicle stability.
    Three types of vehicle models were used by considering the degrees of freedom. The lateral tire-road forces are modeled using Pacejka’s magic formula. The behavior of car stability has been simulated with MATLAB software. The results give the possibility to investigate the vehicle directional stability and the laterals dynamics process.

  • INVESTIGATION MODELS FOR VEHICLE DIRECTIONAL STABILITY- II part

    pg(s) 7-9

    The paper presents a plane mathematical model of two degrees of freedom for vehicle directional stability. This model includes the lateral and yaw motions of the vehicle body. As a result, the model can be used for the analysis of the tire lateral stiffness and tire slip angle on vehicle directional stability. The behavior of vehicle stability has been simulated with MATLAB software. The results give the possibility to investigate the vehicle directional stability and the laterals dynamics process.

  • TRANSFORMATION OF FLEXIBLE ART IMAGE USING SOFTWARE APPLICATION

    pg(s) 13-16

    The report examines the 5-way method as a process with clearly defined intellectual relations – idea, point object, sketch, digital image and implementation. In the first experiment the idea is to create a design product based on photography. In the second experiment the idea is suggesting certain feelings and thoughts through artwork. This initial stage is the accomplished design product transformed into an artwork by traditional painting techniques, collage and assemblage.

  • DETERMINATION OF HEAT TRANSFER COEFICIENT BY INVERSE HEAT TRANSFER ANALYSIS WITH THERMOGRAPHIC EXPERIMENT

    pg(s) 17-19

    The objective of this paper is to determine temperature dependent heat transfer coefficient for the characterization of building porous materials in the range 20 – 60ºC, using the approach based on the solution of the inverse heat transfer problem and the results of measuring boundary conditions. The Levenberg–Marquardt iteration algorithm in software MATHEMATICA is applied to solve nonlinear system of algebraic equations resulting from the sensitivity matrix. The surface temperature distribution is measured using the infrared camera.

  • WEB-BASED SYSTEM FOR MAILPIECE DIAGNOSTICS INTENDED TO USPS

    pg(s) 20-23

    Everyday millions of letters are redirected from old to new addresses of their recipients. It happens because people are changing their homes or job, so the companies changing their location. In order to avoid sending the letters to old and then to the new addresses, which spends lots of recourses, a new generation of Postal Automated Redirection System /PARS/ is applied in USPS. The PARS consists of more than 50 processing sorting centers /P&DC/ equipped with special optical character recognition SW which automatically redirects the letters to the new addresses. This paper presents the design and development of WEB-based Performance Diagnostic System /PDS/ intended to operative control, monitoring and diagnostics of PARS HW and SW components, as well diagnostics and analysis of sorted letters. The PDS can be used for on-line remote control of PARS and the quality and performance of the sorting process.

  • SIMULATION ON SINGLE CYLINDER DIESEL ENGINE AND EFFECT OF COMPRESSION RATIO AND EGR ON ENGINE PERFORMANCE AND EMISSION

    pg(s) 24-26

    In this research, the one dimensional (1D) CFD modelling of four-stroke direct injection diesel engine is developed by AVL Boost software. The performance of a diesel engine increases with increase in compression ratio. Variable compression technologies in IC engines are used to increase fuel efficiency under variable loads. Exhaust gas recirculation is a common way to control in-cylinder NOx production and is used in most modern high speed direct injection diesel engines. However the effect of EGR on performance, combustion and emissions production at different compression ratios are difficult to depict. In the present work an attempt was made to study the effects of exhaust gas recirculation on performance, combustion and emissions of a variable compression Diesel Engine. The test was conducted at different compression ratios with different loads and for different EGR rates.

  • STUDY OF SEVERE PLASTIC DEFORMATION BY MULTI-DIRECTIONAL SHEARING

    pg(s) 27-30

    In order to impose an extremely large strain on the bulk metal without changing the shape, many SPD processes have been developed. This paper present the numerical study of severe plastic deformation by multi-directional shearing in order to determine the materials behaviour in the case of complex solicitations conditions and estimate the magnitude of the final strains obtained. Two hardening laws are considered for describing the material behaviuor: Swift and Ludwick law. The comparison of the numerical results with experimental values for higher levels of strain shows that the Ludwick model presents a better agreement with experimental data. The presented paper gives a method and a numerical tool to study the severe plastic deformation of the materials and to predict the level of the obtained plastic strain.

  • IMPLEMENTATION OF AN AUTOMATED DOCUMENTED IN TEACHING TECHNICAL DOCUMENTATION

    pg(s) 34-36

    This report examined the means of automated design and analysis of technical documentation in CAD environment. Based on the analysis is to develop a methodology for course work in the discipline technical documentation using CAD systems for students of all engineering disciplines. The introduction of CAD products CAD early in training will enhance student motivation for their use – further in the education process in diploma projects.

  • PERFORMANCE MANAGEMENT MODEL FOR HIGH-TECH ENTERPRISES

    pg(s) 37-39

    In the contemporary knowledge-based economy human factor is one of the core competitive advantages of high-tech enterprises. Crucial to the development and commercialisation of innovations is the development of competencies of the human resources.
    Substantial part of the high-tech enterprises are challenged to define precisely what are the most important competencies they need to evaluate and to reward, as well as to foster and develop further in their personnel in order to improves their performance. The aim of the paper is to suggest and analyze the role of an appraisal and performance management model. The model is aimed at helping managers evaluate effectiveness and efficiency of the personnel performance. Further, it can be used as a tool that will aid the decision making process concerning appraisal and reward, training and development, and last but not least the career growth.