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Featured researches published by Ion.


Journal of Thermal Analysis and Calorimetry | 2013

A biomass pyrolysis model for CFD application

Ion Ion; Florin Popescu; Gina G. Rolea

The CFD modeling of biomass combustion or gasification systems needs a description of the volatiles composition that is formed during devolatilization and char oxidation processes. The present model can be used as a submodel in the CFD modeling of combustion or gasification process. This study is a combination of relevant models and data available in the literature to formulate a model that predicts the volatiles in terms of a few simple species. The volatile species considered by this model are CO, CO2, H2O, H2, light hydrocarbons, and heavy hydrocarbons. The model predicts the volatiles as a function of temperature for different biomasses. The model was applied for pyrolysis of briquettes made from agricultural residues. The results are in good agreement with data from literature.


IFAC Proceedings Volumes | 2002

Mobil Mechatronic System with Applications in Agriculture and Sylviculture

Ion Ion; Ion Simionescu; Adrian Curaj

Abstract Walking mechatronic systems protected much better the environment when their contact with the soil is discrete, a fact that limits appreciately the area that is crushed. In order to make and to control a walking robot, one needs the knowledge of all walking potentialities since the choice of the number of legs as well as of their structures depend on the type of gait that has been selected. In the Mobil Robots Laboratory of the POLITEHNICA University of Bucharest, a four-legged modular mechatronic system has been built and tested, while a hexapod one is being tested.


International Journal of Exergy | 2009

Thermodynamic analysis of Spark Ignition engines using the Entropy Generation Minimisation method

Jorge Martins; Bernardo Sousa Ribeiro; Ion Ion

The recent improvement on Spark Ignition Engines has been the result of improved engine thermodynamic cycles, made possible by advances in technologies such as Variable Valve Timing (VVT) and Variable Compression Ratio (VCR). To evaluate the potential of these techniques a thermodynamic analysis is made. Numerical models were implemented in Matlab Simulink using the laws of thermodynamics and include heat transfer, combustion, real working fluid characteristics and intake and exhaust events. The second law analysis allowed the identification of inefficiency sources and directions for improvement. A SI engine was analysed and its processes were evaluated by the amount of entropy generated.


Scientific Journal of Riga Technical University. Environmental and Climate Technologies | 2012

Energy Saving and GHG Emission Reduction in a Micro-CCHP System by Use of Solar Energy

Ion Ion; Gheorghe Ciocea; Florin Popescu

Abstract In this work, the reduction of greenhouse gas emission, and the energy saving by integrating solar collectors and photovoltaic panels in a Stirling engine based microcombined cooling, heating and power (mCCHP) system are studied. The mCCHP system consists of a natural gas Stirling CHP and an adsorber chiller. When the thermal outputs of the Stirling CHP and solar collectors are not sufficient to cover the heat demand for domestic hot water (DHW), heating/cooling, an auxiliary heating boiler starts to operate. The energy saving by using solar energy varies from 13.35% in December to 59.62% in April, in the case of solar collectors usage and from 7.47% in December to 28.27% in July, in the case of photovoltaic panels usage. By using solar energy the annual GHG emission decreases by 31.98% and the fuel cost reduction varies from 12.73% in December to 49.78% in June.


international conference on robotics and automation | 2010

Optimum Design of Industrial Robot Grippers

Ion Simionescu; Ion Ion; Luige Vladareanu

Of all feasible designs, some are “better” than others. If this is assumed as true, then there must be some quality that the better designs have more of than the lees desirable ones do. This quality must be expressed as a computable function of the design variables, and it can consider optimizing to obtain a “best” design. The function with respect to which the design is optimized is called the objective function. In some design situations, there may appear to be two or more quantities which should be objective functions. The goal of the kinematics synthesis of the linkages is to establish the kinematics dimensions of the component elements provided that some conditions are imposed regarding movements of some points or elements. As a rule, only conditions about the positions of the points or elements are imposed. In the other words, only the transmission functions of the positions are used to write the synthesis equations. The solving of the kinematics synthesis problems is reduced to the solving of some nonlinear equation systems. As a result, the problems of the kinematics synthesis of linkages do not have the unique solutions. Only in some very simples particular cases the system of synthesis equations is linear and problem has a single solution. In the optimum synthesis of the gripper mechanisms, the objective function may express the positioning precision of the work pieces, the magnitude of the driving force, the domain of the stable fastening of the work pieces etc. In the work, some considerations about the optimum synthesis of the two fingered self centering grippers are shown.


CLAWAR | 2006

The Modular Walking Machine, Platform for Technological Equipments

Ion Ion; Ion Simionescu; Adrian Curaj; Lucian Dulgheru; Aurelian Vasile

Walking robots represent a special category of robot, characterized by having the power source and technological equipment on-board the platform. A walking robot can traverse most natural terrains. The advantages of a legged system for off-road use have been gradually recognized. One of the most important advantages is mobility.


Advances in Materials Science and Engineering | 2018

A Thermodynamics Study on the Tetrahydrofuran Effect in Exfoliated Graphite Nanoplatelets and Activated Carbon Mixtures at Temperatures between 293.15 and 308.15 K

Florinela Sirbu; Alina Catrinel Ion; Luiza Capra; Ion Ion

A thermodynamics study on exfoliated graphite nanoplatelets dispersed in tetrahydrofuran in comparison with activated carbon dispersed in same solvent was realised. The refractive index, speed of sound, and density of diluted mixed binary solutions of exfoliated graphite nanoplatelets and activated carbon in tetrahydrofuran were measured between 0 and 100 kg·m−3 with composition step of 20 kg·m−3 and at temperatures from 293.15 to 308.15 K and at normal pressure. The isentropic compressibility, acoustic impedance, specific refraction, relaxation strength, and space-filling factor have been evaluated for six concentrations, at four different temperatures for each system. The identified possible molecular interactions between the edges and the surface of exfoliated graphite nanoplatelets and tetrahydrofuran molecules, which include modifications in the structure of exfoliated nanostructured materials in tetrahydrofuran solvent and the influence of the temperature, and of the solute concentration have been calculated based on the obtained experimental values.


Archive | 2015

Renewable Energy Sources for the mCCHP-SE-RES Systems

Nicolae Badea; Ion Ion; Nelu Cazacu; Lizica Simona Paraschiv; Spiru Paraschiv; Sergiu Caraman

The mCCHP-SE-RES system is defined as a particular combined cold, heat, and power system, which is distinguished in that it is a microgeneration system (mCCHP) dedicated to residential building, the CHP unit is a Stirling engine (SE), and the primary energy is obtained from renewable energy sources (RES). In this chapter, the last feature is presented in detail, aiming to recall the basic data and information needed to design such a system. First, it shows the physical fundamentals of the solar energy conversion into electricity or thermal energy, and then the construction and operation of the photovoltaic and thermal solar panels, as well as of the electrical and thermal energy storages assigned to these panels. Also it shows the technical processes of obtaining and burning the biomass, as well as the construction and operation of the Stirling engine and the boiler that can be fueled by biomass.


IFAC Proceedings Volumes | 2012

Some aspects of the modular walking robot MERO's new architecture

Ion Ion; Simionescu Ion; Curaj Adrian; Aurelian Vasile; Dinu Cornel

Abstract The new modular walking robots MERO by reconfiguring their architecture are built to displace the heavy loads on the unaligned terrain. The main characteristic of the modular walking robots is that they are able to move away on unarranged, horizontal and rough terrain The modular walking system protects much better the environment when its contact with the soil is discrete, a fact that limits appreciately the area that is crushed. The new modular walking robots may have a lower or higher autonomy degree. This autonomy has in view the power sources supply capability but also orientation and perception capabilities as regards the terrain configuration the robot is running upon and its decision making and the motion manner towards a target. Architecture of the reference structure of the walking robot has three two-legged modules. Every leg has three degrees of freedom (RRP), a slip sensor and tactile sensor to measure the contact which consists of lower and upper levels. The body of the MERO (MEchanism RObot) walking robot carries a gyroscopic bearing sensor to measure the pitch and roll angles of the platform. The legs are powered by hydraulic drives and are equipped with transducers and sensors. They are used to control the walking robot in the adaptability to a natural ground. In this paper presents some aspects of the new modular walking robot


Archive | 2003

Cost-to-Quality Optimization of Refrigeration

Ion C. Ionita; Ion Ion; Ian K. Smith; Nikola Stosic; Ahmed Kovacevic; Cristian Iosifescu; Viorel Popa

We would approach the problem of optimization quoting some lines of the single book of artificial intelligence that we know to be written for thermal systems [2]: “The term optimization is one of the most misused concepts in the field of Engineering. When reading a technical report about some “optimization” performed on a process or a single component, it is often clear that, in the course of the “optimization” procedures, there was confusion about what was being optimized with respect to what, or what was to be kept constant. Most disappointing thought is the fact that in the quest for an idealized optimum point, frequently configuration, operation and maintenance issues are entirely neglected or grossly underestimated, and a solution obtained via a purely mathematical procedure is presented as the solution to the given design-andoptimization problem. Thus, neighboring “quasi-optima” are disregarded, that in real engineering applications often represent the most convenient solution”.

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Alina Catrinel Ion

Politehnica University of Bucharest

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Ion Simionescu

Politehnica University of Bucharest

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Aurelian Vasile

Politehnica University of Bucharest

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Simionescu Ion

Politehnica University of Bucharest

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Alina Culetu

Politehnica University of Bucharest

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Curaj Adrian

Politehnica University of Bucharest

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Adrian Curaj

Politehnica University of Bucharest

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