1,720,981 research outputs found
Esercitazioni 3D al computer e scenari simulati di medicina d'emergenza e delle catastrofi: il ruolo del fotorealismo
No full textTest of a Numerical Model for a Haptic Pedal Brake System under Different Operating Conditions
No full textThe present study focuses on the analysis of the haptic brake pedal developed hydraulic brake system numerical model behavior varying its operative parameters: nominal conditions, increase of air content in brake fluid and brake pads wear are simulated and compared. To carry out the analysis, an experimental setup based on EtherCAT® network and admittance control loop has been implemented, together with a refinement of the numerical model in order to test plausible passenger car and race car systems. The results show about twice brake pedal angle travel for passenger car layout with respect to the race counterpart. Moreover, the different tested conditions physics captured by the numerical model is reflected in the correspondent pedal angle travels and in the haptic feedback to the user
Characterization of a 6 degrees of freedom parallel robot
No full textThis work describes measurements performed to analyze the performances of a 6 Degrees-of-Freedom (DoF) Parallel-Kinematics-Machine (PKM). In particular, the approach proposed want to explore in the most simple and effective way the overlooked issue of vibratory behavior change inside machine workspace, that represent a complex and often underestimated problem in practical exploitation of parallel kinematics machines
Theoretical and experimental modal analysis of a 6 PUS PKM
No full textIn this article the modal analysis of a manipulator is presented and discussed from a theoretical and experimental perspective. The work focuses on both the simulation and the experimental stages of the modal analysis on six DOF parallel kinematics machine. In particular, the behavioural vibrational trend of the kinematics structure under analysis is presented within the entire workspace. Critical aspects of each test phase are highlighted as well as data post processing methods used. Finally, a map capable of summarizing the modal analysis results is shown
Theoretical and experimental modal analysis of a 6 PUS PKM
No full textIn this article the modal analysis of a manipulator is presented and discussed from a theoretical and experimental perspective. The work focuses on both the simulation and the experimental stages of the modal analysis on six DOF parallel kinematics machine. In particular, the behavioural vibrational trend of the kinematics structure under analysis is presented within the entire workspace. Critical aspects of each test phase are highlighted as well as data post processing methods used. Finally, a map capable of summarizing the modal analysis results is shown
Ambienti collaborativi come strumenti di ricerca e didattica in medicina dei disastri e d'emergenza: il simulatore e-DISTRICT CiPro
No full textDrive chain friction characterization of a 6DOF parallel kinematics robot
No full textThis paper describes a time-efficient method for friction characterization on a Robot drive chain, namely a Ball-screw transmission. The Method promotes practical application by being independent from external sensors and giving very precise and usable output model. A complete extimation procedure is described togheter with the results obtained on the real Machine
Post gravidic superior sagittal sinus thrombosis with elevated levels of homocystinemia
No full textCerebral ischemia in the young (less than 45 years) is an uncommon finding, its ethiology remaining undefined in up to half of cases even if all the common diagnostic paths have been followed. Pregnancy and puerperium are characterised by an increased risk of ischemic stroke and intracranial venous thrombosis. We present a case of a young woman with post gravidic thrombosis of the superior sagittal sinus, occurred 10 days after eutocic delivery. She presented elevated plasma levels of homocystinemia, a sulphur containing amino acid that induce complex changes within the blood vessel wall, acting with an oxidative stress and with a reduction of nitric oxide availability. This clinical case suggests that a complete screening for thrombophilic risk factors should be an integral part in the diagnostic path of central venous thrombosis in young patients also in the puerperium, because it allows to identify thrombophilic risk factors requiring specific treatment
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