The structural and kinematic analyses of a mechanism presented in the specialty literature are performed. The mechanism is used to plot versiera of ellipses and ellipses. We wrote the equations for calculating the positions of the points necessary to realize the geometric model in the ADAMS® program...

This work deals with the dynamic optimization of the control system for the active suspension system of a single-seater race car. The suspension mechanism in study is an innovative one, in its design starting from the requirement to eliminate the contradictory variations of some movement parameters in...

This research addresses to a mannequin design in a parameterized mode similar to a four years old child. The designed mechanical system will be integrated in an active exoskeleton, especially designed for children with locomotion problems. Thus there will be performed measurements for a four years old...

In this paper we will present a new robotic system designed to assist human locomotion. The purpose of using this exoskeleton is to rehabilitate people with locomotor disabilities. We will present the kinematic diagram of a new mechanism used as the leg of an exoskeleton for rehabilitation. We performed...

Selective Laser Sintering, SLS, is a rapid prototyping technique, based on additive manufacturing. It enables fast, flexible, and efficient manufacturing of complex parts, customized according to the requirements of users. Research results on SLS additive manufacturing technique and its specific materials,...

The present paper aims to study the virtual behavior of a prosthetic elbow joint. The values and distribution of stresses in the prosthetic elbow joint by using FEA on the 3D virtual model during flexion-extension movement under the solicitation of a vertical external force are obtained. They are compared...

In order to obtain a personalized three-dimensional model of a patient based on CT images, the InVesalius program was initially used, which performs the initial conversion of the analyzed tissues into a specific engineering file composed of the so-called “point cloud”. This “point cloud” was imported...

The paper first presented the stages of obtaining a virtual model of a female patient, aged 13 years and who had multiple dental malpositions. The patient underwent a CT scan, and CT images were initially processed using the InVesalius program and three-dimensional geometries were obtained, both for...

A four-bar linkage mechanism to accomplish different tasks. Those mechanisms cis used in a vast number of application in different fields accomplish different tasks. Those mechanisms can have some theoretical and practical limitations, depending on their applications. From a theoretical standpoint, four-bar...

The object of the present study is the mathematical side of extremi-related problems. We have studied certain applications of the variational calculus in the domain of vibrations existing in mechanical systems. The most frequently encountered problem in the matter of vibrations is the one of determining...

The paper presents the factors characterizing the non-uniformities that might occur during the technological process of making composite materials. These factors were analyzed in cases of two types of composite materials made of hybrid Dammar-base resin and reinforced with hemp and linen fabric, respectively....

The paper further investigates the Dzhanibekov effect. This effect was noticed for the first time in 1985 aboard the Salyut 7 orbital station. Several different rigid bodies, each and every one of them with its main moments of inertia having close values, are analysed. Rigid bodies, each and every one...

The major objective of this paper is to solve a synthesis problem, namely the design of a mechanism with a double oscillating slide that has the role of rotating a rocker at 180°; the relationships between the lengths of the elements that ensure its rotation without blocking are established. The geometric...

Concerning the optimization design of worm drives, it is especially important to achieve maximum output power of the gear set, which depends particularly intensively on the efficiency coefficient of the worm gear meshing. The purpose of the study presented is to create advanced design optimization procedures...

The aim of this study is to make the kinematic analysis and to design a historical mechanism for the bicycle, without chain, only with links. The relationships between the angular stroke of the pedal rockers and the geometric parameters of the mechanism are established in order to achieve the synthesis...

This research addresses a conceptual design of a flexible robotic system used in the civil engineering domain, respectively in concrete spray procedures. The robotic system has on its structure a 3DOF robotic arm and at the end, it will be mounted a flexible unit that can be bent in four directions under...

Cams and followers are parts of many mechanical systems, including those that assure rotation and translation intermittent movement of an element, example for conveyor belts or rotating stages. The paper deals with the analysis of the influence of geometrical parameters on the kinematics of two-movement...

Two methods were used to study the aperiodicity of a double pendulum based on its chaotic behavior: approximate entropy and maximum Lyapunov exponents. These methods were applied to analyze the aperiodicity of a signal obtained from the angular velocity of the first pendulum. The nonlinear system of...

Lung cancer is the leading cause of death among different type of cancers worldwide. To decrease the recorded mortality rates, earlier diagnosis and timely treatment are essential. The two-degrees-of-freedom robotic and image guided navigation system, ENDORO is designed to find peripheral pulmonary nodules...

This paper presents the analysis of a cantilevered beam using both the commercial FEA software Abaqus and FEMCAS a new software developed for structural analysis. The theoretical approach is described. The results from FEMCAS were comparable with theoretical calculation as well as with Abaqus which shows...

This paper presents the analysis of a cantilevered beam under parametric uncertainties using FEMCAS a new software developed for structural analysis. The theoretical approach is described, including linear analysis module with parametric uncertainties - Monte Carlo simulation, the Perturbation method...

Through this paper there are presented some approaches regarding the experimental research of a walking test bed especially designed for children with ages between 4 to 6 years old. The proposed test bed consists of an exoskeleton and a treadmill. The exoskeleton has six actuation units for motion assistance...

Starting from the statistical data in the field, according to which the most vulnerable road users are pedestrians, with the highest number of deaths, the present research deals with the problem of the impact between a vehicle and a pedestrian. The main purpose of this study is to carry...

The environment is naturally polluted with reversible effects through biological and biochemical cycles. Artificial pollution from industry activities disrupts natural cycles with irreversible consequences. Internal combustion engines are among the most polluting machines manufactured by humans. Worldwide...

The paper propose the modeling and simulate the characteristics of an electric propulsion system that equips a small vehicle that can be used in crowded areas of the cityes in order to reduce the pollution and for this we will use the parameters of Renault ZOE model. Also, in the first part, the paper...

The paper presents the intelligent transport systems used in inland waterway navigation on the Romanian Danube sector, general information on their organization and operation at national, regional and local level, as well as the connection with other functional systems at European level - current situation...

Modern cars now have more intelligent systems than never before. Advanced driver-assistance systems (ADAS) and vehicle-to-vehicle (V2V) communication’s which improve the safety and driving comfort can also be used to decrease fuel consumption and emission. One potential use of these technologies is to...

Some of the most important objectives expected of today’s electric vehicles, as well as from manufacturers and end-users, include electricity consumption, autonomy, which should be able to unequivocally substitute the results obtained by vehicles equipped with a thermic energy source. Based on these...

Performance analysis and measurement of braking parameters are two essential aspects for the correct operation of braking systems but also for their development. The identification of wear patterns and the analysis of wear trends make it possible to develop new systems and make a massive contribution...

This article presents the results obtained following the experimental analysis of the whole-body vibrations transmitted by an electric tractor designed for two types of road and two different speeds recommended by ISO 2631/1 to the driver. The acquisition of experimental data is carried out with the...

Vehicle lighting systems are critical to the safety of night road traffic. Depending on the level of road lighting (urban or extra-urban), the lighting system settings and the nature of the light source used, the position of the steering wheel (LHD - left hand driving or RHD - right hand driving) the...

The homologation process of the internal combustion engines (ICE) is becoming more difficult with the passing of time. Coupled with the need for massive investments in new technologies, such as hybrid or hydrogen powertrains or 100% electrical vehicles, the economy in the traditional automotive manufacturing...

The circular economy has established itself as the economic model that can make a major contribution to achieving the sustainable development goals set by the United Nations through the 2030 Agenda. The European Union has adapted the model to its demands so as to transform the European economy in order...

In this paper we will present theoretical notions, supplemented with studies performed with the finite element method on the distribution of forces in the axial radial ball bearings, as well as the distribution of deformations and stresses on the raceways and rolling bodies of the bearings. The theoretical...

The cold start effect of combustion engines leads to high rate of NOx emissions because the gases temperature of the exhauster is lower than the functioning temperature of selective catalyst reduction systems. This paper aim to present preliminary research, in terms of modelling the thermal field and...

The emissions of CO2 represent an important factor for the automotive industry in the climate change at the global level. The paper aims to study the influence of driving conditions on the CO2 emissions and fuel consumption for two different types of propulsion systems: one conventional propulsion system...

The internal combustion engine has been used for many transportation applications but his efficiency is low mainly to his mechanical and thermal losses. The combustion chamber is designed to be perfectly sealed; however a small part of air and fuel mixture leaks toward the crankcase especially due to...

The paper presented the mathematical processing of data on the probability of failures for 150 starter electric motors of the car type application of a Poisson distribution law. The data regarding the situation of the faults occurred, at the starting electric motors, on 200 thousand km were provided...

The importance of motor vehicle testing stems from the fact that different types of testing, as an integral part of the process of research, development, construction, manufacture, operation and repair, make a decisive contribution to their continuous improvement at all stages. The tests are aimed at...

The paper takes a view on different solutions for rotary engine, such as Mallory and Kaeurtz engine, focusing on Wankel engine. For this one is presented the mathematical background used at inner stator curve, based on peritrochoid or epicycloid curve. The authors makes a cinematic analysis for a triangular...

The scientific paper presents a study on heat transfer in the sandwich walls of the body superstructure of a vehicle for transporting frozen meat carcasses. The transport of perishable products (dairy products, meat, ice cream, vegetables, medicines, etc.) requires particular attention, both to avoid...

The paper aims to present studies on the influence of technological process parameters on geometric accuracy and surface quality, when printing with 3D printers using FFF (FUSED FILAMENT FABRICATION) technology, using PLA wires, 1.75 mm. The research was carried out using a Creality Ender 3D printer,...

The paper aims to present a series of applied studies on specific phenomena, which occurred when stopping the mobile sledge-type subassemblies with reciprocating rectilinear motion. These phenomena can influence the accuracy of the movements necessary for the technological processes of processing on...

In the context of the development of energy demand of all categories, the manufacturing industry is directly interested in finding and developing new solutions for its production in accordance with the requirements and standards at the European and global level. These solutions require higher efficiencies...

Recycled silicone rubber has grown interest due to its excellent mechanic properties, obtained at favorable production costs, which are supported by the use of already available materials waste. Here, we have used three different 3D printed polymeric networks (photopolymerizing resin (SLA), hard photopolymerizing...

Experiments were made for the internal turning of Teflon at high feeds, collecting the resulting chips. There were studied the chips and the machined surfaces using a magnifying glass and a microscope. The shapes and dimensions of these chips were analyzed, explaining their correlation with the feed...

Rivers ships are complex welded structures, built of specific volume sections. Each volume section contains tens or hundreds of nodes, characterized by high restraint conditions. Due to the welding process, each node experiences local concentration of stresses. The paper aims to present a double, analytical...

Microwave heating is a green technology that provides many advantages over conventional heating. In this paper, we analyse some composite ceramic materials, formed by barium carbonate and hematite powders. There were used three mixtures with micron, submicron and nanometric particles size. All the mixtures...

In this paper finite element analysis is applied to evaluate the results regarding the stress and deformation during the turning process of the commercially pure titanium. The results are a very important task to appreciate the state of the piece, from point of view of stress and deformations, during...

Due to the tendencies to deform the component during milling process, and, as it is known, this can affect the dimensional characteristics, and not only, is very important to evaluate total deformation, equivalent elastic strain, equivalent stress, directional deformation, on X, Y and Z axis, shear elastic...

This work presents research on the two possible ways to machine multiple holes on the same part, arrayed placed. The problem is approached from the economical point of view. The objective is to provide a tool able to help in choosing the best solution, either in terms of expenses, or of processing time,...

Lean Manufacturing is an integrated socio-technical system, whose main objective is to eliminate waste. One of the basic techniques of Lean Manufacturing is the 6S technique which helps to improve productivity. The 6S technique is not only the basis for all improvements, but also it supports the positive...

The paper presents a fastening system of parts of small size and thickness of a vacuum table type. The proposed solution is intended to be used in the clamping and machining of this type of part mainly on the vertical machining center Young Tech YMC 1050, but also on other production systems. The virtual...

Since the introduction of the buildings that targets the first energy conservation regulations in the 1970s and the increasing emphasis on the field in the late 1990s and early 2000s, a wide range of methodologies have been developed for predicting, analyzing and evaluating the energy performance of...

The paper presents the influence of the thermal insulation system applied following a thermal rehabilitation process on a block of flats with a GF + 6F height regime, regarding: the resulting linear deformation state, the stress state and the building's own vibration modes. The study model used...

The article presents some conclusions on the comfort microclimate at educational buildings, by monitoring the temperature during the summer. The laboratories are located in two buildings, which differ from the point of view of the construction and building envelope, different positions, from the cardinal...

The structural rehabilitation of buildings with cultural value represents a complex field for practice. We had the opportunity to participate in the project of rehabilitation of Palace Hotel, one of Craiova’s most iconic buildings. The Palace Hotel is a historical monument and it was built with the original...

Restoration projects involve, first, a very careful measure of intervention decisions in relation to the cultural value of the protected monument. The façades of the building represent the most exposed elements, being on the one hand the most visible for visitors, but also the most sensitive in front...

The purpose of this paper is to determine the correct method to simulate the seism behavior of a structure with a raft-type foundation, taking into account the elasticity of the soil using the Winkler hypothesis. This paper presents a comparison between two methods of modeling in the ETABS program a...

This paper presents a new Stiffness Relaxation method of the classic Bouc-Wen hysteresis model, used to simulate the hysteresis loop of Romanian friction dampers SERB-C-194 in seismic analysis of buildings equipped with this type of seismic dampers. The classic model does not accurately simulate the...

This paper presents a study of seism analysis of a reinforced concrete frame structure with a height of B + 5S, made in order to determine the performance of the damping system with viscous fluid that equips the superstructure for buildings of medium height (15–20 m). For this, the GenEcAm program developed...

This paper presents the seism dynamic analysis of a ten-stories building equipped with anti-seismic viscous fluid dampers, in order to determine the influence of the damping coefficient c on the building relative displacements and dampers forces during seism. By modifying the damping coefficient c, three...

In this paper is presented a new mathematical differential model used for simulating the hysteresis phenomenon of romanian seismic energy dissipating devices which are usefull in seismic protection of buildings suprastructure. Existing mathematical models do not provide adequate modeling of the behavior...

In this paper we propose a selection method for green building materials for insulations, based on an integrated AHP - SAW method. Building materials and thermal insulation materials must have a minimal impact on the environment so as to reduce greenhouse gas emissions but also ensure high energy efficiency...

This paper presents the seism analysis of a tall building structure (33 m) made of reinforced concrete frames performed according to Romanian Design Code P100–1/2019. This design code allows the seism analysis of a building to be done with the method of equivalent static forces and with the modal method...

To save the environment we need to recycle. In order to save natural resources we must recycle glass products. These recycled glass products are crushed and the necessary sorts are created, namely 0/4 mm and 4/8 mm, which we can partially replace from the aggregates of ballast or quarry needed to make...