Enrico C. Lorenzini

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This dissertation focuses on the synchronization of multiple dynamical systems using contraction theory, with applications to cooperative control of multi-agent systems and synchronization of interconnected dynamics such as tethered formation flight. Inspired by stable combinations of biological systems, contraction nonlinear stability theory provides a(More)
In this paper, we use Bejan’s Constructal theory to optimize the geometry of a H-shaped cavity that intrudes into a solid conducting wall. The objective is to minimize the global thermal resistance between the solid and the cavity. Internal heat generation is distributed uniformly throughout the solid wall. The cavity surface is isothermal, while the solid(More)
Ultimately, after the Single Aperture Far-IR (SAFIR) telescope, astrophysicists will need a far-IR observatory that provides angular resolution comparable to that of the Hubble Space Telescope. At such resolution galaxies at high redshift, protostars, and nascent planetary systems will be resolved, and theoretical models for galaxy, star, and planet(More)
A vision based instrument able to measure the position and orientation of a spacecraft is described and calibrated from a metrological point of view. The instrument comprises a simple camera which observes the external surface of the satellite provided with fiducial markers and a software procedure which employs a closed-form and direct solution of the(More)
Ground-based testbeds have been used since the beginning of space exploration for both hardware and software validation. In this paper we describe the innovative aspects of the attitude module of a cooperating spacecraft testbed under development at the University of Padova. We also present and discuss experimental results of specific attitude control(More)
Satellite Formation Flying (SFF) is a key technology for several future missions, since, with respect to a single spacecraft, it allows better performances, new capabilities, more flexibility and robustness to failure and cost reduction. Despite these benefits, however, the SFF concept poses several significant design challenges and requires new(More)
We propose a dedicated mission in low Earth orbit to test the gravitational interaction and place improved limits on the atmospheric density at the altitudes of interest. A very simple spacecraft would be placed in a dawn-dusk eccentric orbit between 500 and 1200 km. It should be tracked with high precision, and an on-board accelerometer would measure the(More)
Electrodynamic space tethers offer the opportunity for in-space “propellantless” propulsion around planets with a magnetic field and an ionosphere. This propulsion is accomplished by converting the magnetic force on the tether current into propulsive or drag thrust to either increase or decrease the orbital energy of the spacecraft system. To validate(More)
Ground-based testbed have been used since the beginning of space exploration for the development and verification of both hardware and software. In this paper, we present the calibration and the validation of an optical flow sensor based navigation system for our ground-based spacecraft testbed. This contactless and low cost system is designed to estimate(More)