A5040717940- Rocket and propulsion systems research
- Energetic Materials and Combustion
- Aerospace Engineering and Control Systems
- Spacecraft Dynamics and Control
- Spacecraft and Cryogenic Technologies
- Gas Dynamics and Kinetic Theory
- Heat transfer and supercritical fluids
- Network Time Synchronization Technologies
- Computational Fluid Dynamics and Aerodynamics
- Real-Time Systems Scheduling
- Spacecraft Design and Technology
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Inertial Sensor and Navigation
- Space Exploration and Technology
- Combustion and Detonation Processes
- Advanced Control Systems Optimization
- Pulsars and Gravitational Waves Research
- Superconducting Materials and Applications
- Advanced Combustion Engine Technologies
- Stability and Control of Uncertain Systems
- Space exploration and regulation
- Synthesis and properties of polymers
- Ionosphere and magnetosphere dynamics
- Structural Analysis and Optimization
Agenzia Spaziale Italiana
2019-2024
Sapienza University of Rome
2009-2017
European University of Rome
2008
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
1994
This paper deals with the optimization of ascent trajectory a multistage launch vehicle, from liftoff to payload injection into target orbit, considering inverse-square gravity acceleration and aerodynamic forces. A combination lossless successive convexification techniques is adopted generate sequence convex problems that rapidly converges original problem solution. An automatic initialization strategy proposed make solution process completely autonomous. In particular, novel three-step...
This paper outlines a novel approach to the design of optimal space trajectories under significant uncertainty. Finite-horizon covariance control, i.e., steering system from an initial probability distribution desired one at prescribed time, is employed plan nominal path along with robust feedback controller that compensates for exogenous in-flight disturbances. A mindful convexification strategy devised recast nonlinear control problem as deterministic convex optimization problem. The based...
This paper presents a convex programming approach to the optimization of multistage launch vehicle ascent trajectory, from liftoff payload injection into target orbit, taking account multiple nonconvex constraints, such as maximum heat flux after fairing jettisoning and splash-down burned-out stages. Lossless successive convexification methods are employed convert problem sequence subproblems. Virtual controls buffer zones included ensure recursive feasibility process, state-of-the-art...
In the world of space systems and launchers in particular, there is always a strong demand for reduction weight all components/subsystems that are not related to payload simplification integration phase. A possible solution both these problems replacement cables connectors with wireless communication power supply. With this aim, survey was carried out through an analysis technical/scientific literature available on standards electric transfer methods. To evaluate systems’ effective...
The first run of the ultracryogenic resonant bar detector AURIGA is in progress. Diagnostics on cryogenics, data acquisition system and noise characteristics have been performed, with results accord design. reached 140 mK. In tests down to 2 K was very close `Brownian'.
In this work the regression rate performance and flow physics of a lab-scale hybrid rocket engine burning gaseous oxygen paraffin-based fuels are experimentally numerically investigated. Regression rates obtained by thickness-over-time averaging procedures through non-intrusive optical method enabling fuel grain port diameter tracking. A numerical rebuilding experimental data is performed with axisymmetric Reynolds-averaged Navier-Stokes simulations, using sub-models accounting for effects...
Italian teams have been involved many times in Space Weather observational campaigns from space and the ground, contributing advancing of our knowledge on properties evolution related phenomena. Numerous forecasting now-casting modeling efforts resulted a remarkable add-on to overall progress field, at both national international level. The Agency has participated several missions with science objectives Weather; indeed, an important field for scientific industrial communities interested...
Smart hinges for self-deployable solar sails have been prototyped by using shape memory polymer composites (SMPCs). During hinge lamination, a (SM) epoxy resin is deposited between carbon fiber reinforced (CFR) plies, and consolidation obtained an out-of-autoclave (OOA) process. The smart assembled with CFR booms to prototype small square sail. Polymeric supports, made fused deposition modelling (FDM), added correct assembly drive the recovery of SMPC hinges. Flexible heaters used as heating...
In the design and development of solid propellant rocket motors, use numerical tools able to predict behavior a given motor is particularly important in order decrease planning times costs. This paper devoted present results internal ballistics simulation NAWC tactical n. 6, from ignition burn-out, by means quasi-one-dimensional unsteady model, SPINBALL, coupled with three-dimensional grain burnback GREG. particular, attention focused on effects SRM erosive burning, total pressure drops...
In the design and development of solid propellant rocket motors (SRMs), use numerical tools able to simulate, predict reconstruct behavior a given motor, in all its operative conditions, is particularly important order decrease planning times costs. This paper devoted propose present an approach simulation SRM internal ballistics, during entire combustion time, by means dierent own made models. The core this procedure represented SPINBALL model code. considers Q1D unsteady modeling with many...
indovinare ciò che sta vivendo.Solo più tardi gli viene tolto il fazzoletto dagli occhi e lui, gettato uno sguardo al passato, si accorge di cosa ha realmente vissuto ne capisce senso.M. Kundera, Gli amori ridicoli II Ab s t r a c tThe operative life of many large solid rocket motors (e.g.US Space Shuttle SRM, Ariane 5 P230 Titan P80 the five-segment test motor ETM-3) is characterized by presence sustained longitudinal pressure (PO, oscillations) and thrust oscillations.Their frequency close...
Large solid rocket motors can exhibit sustained pressure and thrust oscillations during the quasi-steady operative condition. These uctuations are characterized by a frequency close to rst acoustic mode, or one of its multiple, combustion chamber. The origin this phenomenon is coupling between shear layer instabilities, feedback, resulting from distruction vorticity some geometrical features chamber, as port area variations nozzle walls. In present work, quasi-onedimensional model for...
A three-dimensional high-fidelity numerical simulation of a small-scale solid rocket motor is carried out adopting the implicit large-eddy (ILES) approach to investigate coupling between vortex shedding and acoustic modes chamber. The ONERA C1xb laboratory-scale model considered at firing time close ignition, corresponding 3-mm-grain burned layer. analysis focuses on characterization unsteady pressure signature wall, with emphasis role played by turbulence level oscillations. It found that...
This paper presents a convex programming approach for the optimization of full ascent trajectory reusable launch vehicles, from lift-off to orbit payload injection, together with soft landing first stage. A combination lossless and successive convexification methods is employed handle nonlinear dynamics constraints. Two strategies recovery stage, that is, downrange return-to-launch site, are discussed. Preliminary results presented show effectiveness performance proposed study case involving...
This paper presents a convex approach to the design of optimal space trajectories while explicitly accounting for uncertainty. A covariance control problem aimed at driving stochastic system from an initial probability distribution desired one final time is formulated retrieve nominal trajectory and additive state feedback controller that can compensate exogenous in-flight disturbances. The regulates thrust magnitude and, consequently, propellant mass consumption. As result, random variable...
The optical properties of micrometric-thick polyimide membranes were analyzed between 200 nm and 2500 to assess their potential use as substrates for the fabrication wide devices space applications. These prepared from fully aromatic polyimides containing trifluoromethyl functional groups which have already been used in shown excellent resistance environment. Various synthesized using two different solvents thermal treatments. Spectrophotometric ellipsometric measurements performed estimate...
The use of paraffin-based fuels is a promising approach to low regression rate in hybrid rocket engines, and the capability describe predict combustion instability presence liquefying becomes an enabling step towards application rockets wide range space transportation systems. In this work, multiphysics model having purpose presented discussed. based on network submodels which chamber gas dynamics described by quasi-1D Euler for reacting flows while thermal diffusion grain 1D heat equation...
Abstract This paper addresses the prediction of spontaneous self-sustained transverse combustion instabilities in multi-injector engines using a multi-dimensional non-linear low-order Eulerian model. The approach utilizes physically aware response function that directly links pressure oscillations to fuel mass flow rate, independent external data. enables accurate capture behavior shear coaxial injectors have been proven show peculiar dynamics cyclic accumulation and release acoustic waves....
Hybrid rockets have very interesting characteristics like simplicity, reliability, safety, thrust modulation, environmental friendliness and lower costs, which make them attractive for several applications sounding rockets, small launch vehicles, upper stages, hypersonic test-beds planetary landers. In recent years, advancements been made to increase hybrid motor performance, two of the most promising solutions are vortex injection paraffin-based fuels. Moreover, both technologies can be...