54 research outputs found
Real-time loading actuator control for an advanced aerospace test rig
No full textThe growing complexity of aircraft systems requires that extensive testing be performed on dedicated test rigs to grant the necessary flight clearance and to provide troubleshooting of the problems that may arise during prototype flight trials. A new test rig is described herein, that was recently built to provide comprehensive testing of the flight controls, landing gear, and hydraulic systems of the M-346 advanced trainer aircraft. All these subsystems are connected together on the rig as in the real aircraft to ensure that the entire system operates on the rig exactly as on the aircraft. To that purpose, a high-performance force control system was developed to provide accurate dynamic loading of the primary and secondary flight control actuators, and the structure onto which the flight control actuators are mounted provides a mechanical load path with the same stiffness as in the real aircraft. The present paper describes the main characteristics of the test rig and puts particular emphasis on the force control system that makes use of an adaptive control law to provide a very accurate control of the force acting upon the actuators during fast transients
Micro-Mobility Security: A Holistic Approach via Mobile App Analysis
No full textThe growth of urbanization and technology has reshaped transportation, bringing about shared micro-mobility services like e-scooters and e-bikes as sustainable solutions for short urban trips, mitigating traffic and pollution issues. However, the rapid expansion of this market has outpaced the development of standardized security measures. Our research aims to analyze theoretically and empirically the security landscape of shared micro-mobility services, focusing on client components. We present a reference architecture and a detailed threat model to identify and address the most pressing security challenges. Additionally, we design a set of experiments to evaluate existing services and assess their security implementations. Finally, we propose guidelines and best practices to enhance the security of shared micro-mobility services, highlighting the need for a standardized security approach and offering a foundation for future research
Matching perturbative and parton shower corrections to Bhabha process at flavour factories
No full textWe report on a high-precision calculation of the Bhabha process in Quantum Electrodynamics, of interest for precise luminosity determination of electron–positron colliders involved in R measurements in the region of hadronic resonances. The calculation is based on the matching of exact next-to-leading order corrections with a parton shower algorithm. The accuracy of the approach is demonstrated in comparison with existing independent calculations and through a detailed analysis of the main components of theoretical uncertainty, including two-loop corrections, hadronic vacuum polarization and light pair contributions. The calculation is implemented in an improved version of the event generator BABAYAGA with a theoretical
accuracy of the order of 0.1%. The generator is now available for high-precision simulations of the Bhabha process at flavour factorie
Radiative events as a probe of dark forces at GeV-scale e+e- colliders
No full textStudy of the experimental sensitivity to a new light and weakly coupled neutral gauge bosons ("dark photon") at present and future flavor factorie
Standard model precision tests at hadron colliders: Theoretical control on Drell Yan processes
No full textAfter discussing the relevance of single-W and single-Z production processes at hadron colliders, we review the theoretical knowledge of Drell--Yan physics and present some preliminary results on the combination of electroweak and QCD corrections to a sample of observables of the process pp \to W\pm \to \mu \pm + X at the LHC. Our phenomenological analysis shows that a high-precision knowledge of QCD and a careful combination of electroweak and strong contributions is mandatory in view of the anticipated LHC experimental accuracy
Drell-Yan processes at hadron colliders
No full textThe present status of the theoretical predictions for the charged current and neutral Drell-Yan processes at hadron colliders is reviewed
Matrix elements and Parton Shower in the event generator BABAYAGA
No full textDescription of the latest version of the generator BabaYaga, with NLO accuracy matched with QED exponentiation
Photon pair production at flavour factories with per mille accuracy
No full textAbstractWe present a high-precision QED calculation, with 0.1% theoretical accuracy, of two photon production in e+e− annihilation, as required by more and more accurate luminosity monitoring at flavour factories. The accuracy of the approach, which is based on the matching of exact next-to-leading order corrections with a QED Parton Shower algorithm, is demonstrated through a detailed analysis of the impact of the various sources of radiative corrections to the experimentally relevant observables. The calculation is implemented in the latest version of the event generator BabaYaga, available for precision simulations of photon pair production at e+e− colliders of moderately high energies
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