Inginerie Mecanică
The linear equivalence method (LEM) was previously introduced by Toma to for getting and studying - both numerically and qualitatively - the solutions of nonlinear dynamical systems. LEM is applied here to Düffing equation. The normal LEM representations emphasize the dependence on parameters and are particularly fitte…
picture_as_pdfText integral (PDF)The instantaneous values and the time-averaged values, respectively, are determined for the lift force and thrust generated during symmetrical horizontal flight of a flapping-wing micro air vehicle (FWMAV). The study methods are applied on a simplified but general model, which can be used, without fundamental modificat…
picture_as_pdfText integral (PDF)For reducing noise levels at ventilating and air conditioning installations, an exact understanding of causes and their occurence are of primary interest. Then, one tries to find new and viable solutions for the proposed goal. Experimental researches performed on an installation with different operating conditions took…
picture_as_pdfText integral (PDF)In this paper the author proposes some mathematical models of reduction of the elementary bodies to systems of material points with the same inertia properties, which means: the same centre of mass and the same tensor of inertia. Starting from these models, each body can be reduced to a system of material points and th…
picture_as_pdfText integral (PDF)Chromoplastic materials can be included in the category of materials that have a Prandtl-type characteristic curve. Such materials were obtained in Romania, at the Chemical Research Institute Bucharest and they are compounded polymers that have a linear-perfect plastic behavior in traction. The material changes its col…
picture_as_pdfText integral (PDF)The paper presents one new method of the assisted determination of the transfer function of the vibrations, global dynamic compliance and of the transmissibility of one didactical robot with magnetorheological damper. By using the comparative method and the proper virtual Fourier analyzer, we were possible to choose th…
picture_as_pdfText integral (PDF)This paper presents the types of noxious substances and the quantities determined following the experiments using shielded metal arc welding (SMAW).\r\nIt also presents the influence of the main parameters of the welding procedure on the pollution coefficient.
picture_as_pdfText integral (PDF)The paper presents experimental research and results in case of determining surface roughness when milling workpieces made of zinc alloys. Even if zinc alloys are used in many cases for mass production and large series of products, until present these materials are not known from the cutting ability point of view. Roug…
picture_as_pdfText integral (PDF)This paper is the result of the authors’ investigations on the temperature at the edge of the tool, during turning of unalloyed steel, depending on the parameters of the cutting process with conventional values. For the determination of the temperature values of the cutting edge an experimental setup with natural and …
picture_as_pdfText integral (PDF)The algebraic waterhammer method has been adapted to transient flow analysis along the whole hydraulic route between reservoir and plant’s turbines. The model allows to include the inertial and friction effects of water column into the surge – tank and secondary intake shaft, and the dissipation energy effect in the co…
picture_as_pdfText integral (PDF)The present paper is dedicated to the experimental investigations and numerical simulations of the velocity distributions in micro-channels geometry, for pure viscous Newtonian fluids and complex fluids characterized by the shear thinning behavior. The steady flow kinematics in Y-micro-bifurcation is determined with a …
picture_as_pdfText integral (PDF)Let\\\\\\\'s consider a looped water supply network with variable demand, which includes two pumping stations (each with 3 pumps working in parallel at constant speed), a suction reservoir with constant level and two tanks with variable water level. Using the Honey Bees Mating Optimization Algorithm (HBMOA), with penal…
picture_as_pdfText integral (PDF)The biphasic gas-liquid systems are widely used in wastewater treatment and purification techniques where raised oxygen concentrations into the aqueous environment are required. This paper proposes a model for oxygen transfer from air into water in the biphasic environment liquid-air bubbles level, for a combined aerat…
picture_as_pdfText integral (PDF)The present work is concerned with experimental investigations on a polymerization reaction in a Taylor-Couette reactor (TCR). The overall aim of the project is to investigate the relationship between mixing and a chemical reaction in TCR. In this work premixed monomer-solvent solutions are polymerized in TCR in the pr…
picture_as_pdfText integral (PDF)Romania, as European Union member country, has undertaken that by 2015 to improve the surface water quality to „good ecological status”. The most at risk of failing to meet quality standards are the rivers in which wastewater (partially treated or untreated) are discharged. In the paper it is compared the results of me…
picture_as_pdfText integral (PDF)Global existence of a large percentage of lakes with eutrophication problems, demands a predictive tool for the quality of these ecosystems. This paper proposes an ecological model (nutrient-phytoplankton) that describes the biochemical behavior of a small natural lake eutrophic. The 1D model developed allows the estim…
picture_as_pdfText integral (PDF)The study is dedicated to the investigations of a pure viscous fluid in oscillatory squeezing flow between two parallel discs. The experiments are performed using the Micro Fourier Rheometer prototype MFR 2100 and the numerical simulations of the flow are obtained with the deformation mesh procedure implemented in the …
picture_as_pdfText integral (PDF)The aim of the paper is to validate a numerical model using a comparison with available experimental data for a slender body configuration with canard fins. Four basic configurations are considered, for which the theoretical results are analyzed in comparison with experimental ones. The numerical model was developed us…
picture_as_pdfText integral (PDF)Any human action or activity involves taking inevitable risks. Risks in a new product launching, in the conduct of investment etc. are due to market fluctuations and to competition. In principle, the causes of this undesirable phenomenon’s cannot be influenced, but seeks to reduce their effects by trying to avoid, mini…
picture_as_pdfText integral (PDF)The behavior in exploitation of processing centers determines their productivity and the quality of manufactured parts. The term of functional stability refers to the maintenance of processing precision in time on the machines-tool with CNC in the prescribed limits, considering the modification in time of the precisio…
picture_as_pdfText integral (PDF)Ecological impact and risk assessments have become of increasing importance in our daily life. The majority of used methodologies until now have been totally subjectiv. That is why the assessments remained dependent the on initial collected data and on the evaluators background and expertise, a major disadvantage being…
picture_as_pdfText integral (PDF)In this paper the authors have sought to present the value analysis methods which were the basis for creating a computer network developed under the IN – TECH – TRANSFER and used within the program \\\\\\\\\\\\\\\"Competitiveness and Innovation”. This software tool allows targeting of resources in some research institu…
picture_as_pdfText integral (PDF)The project management has not only to concern resources allocation process to best satisfaction the objectives assigned, but also to promote collaboration between the actors involved in the project. During the project, the project leader will analyze the real state of design conditions and stimulate the collaborating …
picture_as_pdfText integral (PDF)