Search results for "Engineering sciences"
showing 10 items of 2347 documents
Evaluer simplement et efficacement les incertitudes de mesure
2021
Complémentarité entre réseau véhiculaire et réseau LTE
2013
Multi-impact damage of laminated composite materials studied with a compressed air cannon
2022
Indoor positioning of dynamic objects by VLC/LIFI technology
2021
Near-Field Velocity Measurement of a Multihole GDI Injector
2017
This work focuses on the experimental measurements of the spray velocity in the near-nozzle field of a commercial GDI injector at two injection pressures: 5 MPa and 10 MPa. Two regions were investigated by means of backlight imaging technique: the jet periphery (dilute region) within 10 orifice diameter; and dense region within 30 orifice diameter. Two cross-correlation algorithms were used: an in-house algorithm, applied to the dilute region, while a standard PIV algorithm was applied to the dense region. It yields that with a careful setting of the parameters, both algorithms were highly precise: less than 1.2% error in the dilute region and 3% in the dense region. Moreover, the consisten…
Description of sound absorption by a flat resonator stacking metamaterial with double porosity model
2023
Acoustic metamaterials can be designed by inserting along the path of a sound wave periodically spaced side resonators. An example of efficient design was recently proposed consisting of a perforated stacking of flat annular cavities (the pancake resonator), the perforation allowing the propagation of sound waves. The pancake resonator is used in absorber mode and the theoretical description of sound absorption can be achieved with the help of the theory of sound propagation in fluid saturated porous media in which two porosities are considered: the main porosity associated with the perforation and a porosity associated with the flat cavity volumes. Considering a perforation diameter and fl…