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Radu Alexandru Ionut,Toganel George Radu,Trusca Daniel Dragos 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.5
The aim of this paper was to develop a mathematical model for the study of the kinematic parameters of an occupant and vehicle during a side impact crash. The proposed model has three bodies (the vehicle, the occupant torso and head) that are interconnected to each other by joints, springs and dampers. Also, the head-to-window contact force is taken into account in order to obtain accurate results for the occupant kinematic injury assessment. The model was designed using a CADCAE software, with a flexibility determined by a total of 63 input parameters and 10 selected output parameters. The model has shown positive results with a high degree of similarity to a crash test, overlapping with a margin of error within under 5 % for an impact simulation time of 300 ms. After validation, a number of parameters could be obtained from the model such as the linear and angular displacement of the torso, head and vehicle that can be used to study the side collision kinematics and dynamics. During the simulation, a displacement of 2 m for the vehicle was registered while a force of 3500 N was reached for the head-to-window contact, for a vehicle-to-vehicle initial collision velocity of 11.6 m/s.
Development of a Multibody Model Used to Study the Impact Between a Vehicle Wheel with a Pothole
Radu Alexandru Ionut,Tolea Adrian Bogdan,Trusca Daniel Dragos,Ispas Nicolae,Nastasoiu Mircea 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.5
The aim of the work was to develop a multi-body model that can simulate the impact between the vehicle wheel and a pothole. The model consists of the vehicle wheel together with front McPherson suspension assembly and a potholed road surface. Therefore the kinematics of the suspension when the vehicle hits a pothole can be simulated. The model was first predetermined by an analytical calculation and then successfully validated by an experimental test performed with the same parameters as the virtual model. The results were very similar and therefore allow the model to be used to simulate different scenarios in terms of wheel dynamics and behavior when impacting potholes with different depths.
Maria Sonmez,Denisa Ficai,Ioana Lavinia Ardelean,Roxana Trusca,Laurentia Alexandrescu,Doina Constantinescu,Zeno Ghizdavet,Ovidiu Oprea,Anton Ficai,Ecaterina Andronescu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
In this study, the synthesis and characterization of functionalized flax fabric with adequate titanium and aluminiumprecursors is presented (AlCl3 or Ti(C4H9O)4). The modified flax fabrics were analysed both visually and instrumentally byIR spectroscopy and microscopy, scanning electron microscopy (SEM) and thermal analysis (DTA-TG). The data highlightthat the nature and amount of functionalizing agent induce important morphological changes of the surface. These flaxfabrics decorated with alumina or titanium dioxide nanoparticles are desired to be used as reinforcing agents of differentrecycled polyethylene terephthalate. The properties will be designed by the nature, processing route and amount of theprecursors used for the surface modification of these cellulosic fibres/fabrics, the surface decoration increasing their thermalproperties (especially thermal stability) but also surface properties (especially roughness, hydrophilic/hydrophobic ratio,etc.). All these factors will finally induce improved compatibility between phases and thus improved physico-mechanical andthermal properties. Taking into account the large amount of natural cellulosic fibres and recycled thermoplastic polymers,added-value products will be obtained and at the same time some environmental issues are solved. The expected applicationscan include the fabrication of automotive parts, protective panels for highways and railways, etc.