Trajectory Approximation for Low-Performance Electric Sail with Constant Thrust Angle

Quarta, Alessandro A.; Mengali, Giovanni

doi:10.2514/1.59076

Cited by 22 publications

(39 citation statements)

References 19 publications

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“…During the navigation process, to make sound decisions, the sail-assisted USV should acquire the data related to the wind energy and the environment around itself in real time. By using the wind speed sensor and the wind direction sensor, the raw data are obtained [23]. The wind speed equals 1/71 of its initial frequency signal, and the wind direction data also can be reached after being processed by digital filter.…”

Section: Data Processing For the Sensor Systemmentioning

confidence: 99%

Design of Sail-Assisted Unmanned Surface Vehicle Intelligent Control System

Zhao

Diao

et al. 2016

Mathematical Problems in Engineering

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To achieve the wind sail-assisted function of the unmanned surface vehicle (USV), this work focuses on the design problems of the sail-assisted USV intelligent control systems (SUICS) and illustrates the implementation process of the SUICS. The SUICS consists of the communication system, the sensor system, the PC platform, and the lower machine platform. To make full use of the wind energy, in the SUICS, we propose the sail angle of attack automatic adjustment (Sail_4A) algorithm and present the realization flow for each subsystem of the SUICS. By using the test boat, the design and implementation of the SUICS are fulfilled systematically. Experiments verify the performance and effectiveness of our SUICS. The SUICS enhances the intelligent utility of sustainable wind energy for the sail-assisted USV significantly and plays a vital role in shipping energy-saving emission reduction requirements issued by International Maritime Organization (IMO).

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Section: Data Processing For the Sensor Systemmentioning

confidence: 99%

Design of Sail-Assisted Unmanned Surface Vehicle Intelligent Control System

Zhao

Diao

et al. 2016

Mathematical Problems in Engineering

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“…Several researchers have obtained numerical and analytical solutions for several maneuvers involving specific initial and final orbits and specific thrust profiles (Edelbaum 1965(Edelbaum , 1966Marec et al 1980;Haissig et al 1993;Geffroy and Epenoy 1997;Sukhanov 2000;Kiforenko 2005;Bonnard et al 2006;Da Silva Fernandes and Carvalho 2008;Jamison and Coverstone 2010;Quarta and Mengali 2013). In the analytical studies, averaging techniques are applied and solutions of the averaged equations are obtained such that only secular behavior of the optimal solutions is discussed.…”

Section: Introductionmentioning

confidence: 98%

Optimal low-thrust transfers between coplanar orbits with small eccentricities

2015

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In this paper, a first-order analytical solution, which includes the short periodic terms, for the problem of optimal time-fixed low-thrust limited-power transfers (no rendezvous), in an inverse-square force field, between coplanar orbits with small eccentricities is obtained through canonical transformation theory. Short periodic terms are eliminated from the maximum Hamiltonian, expressed in non-singular orbital elements, through an infinitesimal canonical transformation built through the Hori method. Closed-form analytical solutions are obtained for the average canonical system by solving the Hamilton-Jacobi equation through the separation of variables technique. For long duration maneuvers, the existence of conjugate points is investigated through the Jacobi condition.

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“…E-sail-and solar sail-based trajectories have already been analyzed in an attempt to find approximate analytical solutions to the equations of motion. For example, Quarta and Mengali proposed an analytical approximation for the trajectory of a low-performance E-sail with a constant thrust angle [47]. In a subsequent work [48], Quarta and Mengali offered an approximate expression of the E-sail heliocentric trajectory by reducing the problem to the dynamics of an equivalent nonlinear oscillator with a single degree of freedom, and assuming that the E-sail provides a purely outward radial thrust.…”

Section: Introductionmentioning

confidence: 99%

Spiral trajectories induced by radial thrust with applications to generalized sails

et al. 2020

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In this study, new analytical solutions to the equations of motion of a propelled spacecraft are investigated using a shape-based approach. There is an assumption that the spacecraft travels a two-dimensional spiral trajectory in which the orbital radius is proportional to an assigned power of the spacecraft angular coordinate. The exact solution to the equations of motion is obtained as a function of time in the case of a purely radial thrust, and the propulsive acceleration magnitude necessary for the spacecraft to track the prescribed spiral trajectory is found in a closed form. The analytical results are then specialized to the case of a generalized sail, that is, a propulsion system capable of providing an outward radial propulsive acceleration, the magnitude of which depends on a given power of the Sun-spacecraft distance. In particular, the conditions for an outward radial thrust and the required sail performance are quantified and thoroughly discussed. It is worth noting that these propulsion systems provide a purely radial thrust when their orientation is Sun-facing. This is an important advantage from an engineering point of view because, depending on the particular propulsion system, a Sun-facing attitude can be stable or obtainable in a passive way. A case study is finally presented, where the generalized sail is assumed to start the spiral trajectory from the Earth’s heliocentric orbit. The main outcome is that the required sail performance is in principle achievable on the basis of many results available in the literature.

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Trajectory Approximation for Low-Performance Electric Sail with Constant Thrust Angle

Abstract: a.quarta ing.unipi.it. Senior Member AIAA. † Associate Professor, Department of Aerospace Engineering, g.mengali ing.unipi.it. Senior Member AIAA.

Cited by 22 publications

References 19 publications

Design of Sail-Assisted Unmanned Surface Vehicle Intelligent Control System

Design of Sail-Assisted Unmanned Surface Vehicle Intelligent Control System

Optimal low-thrust transfers between coplanar orbits with small eccentricities

Spiral trajectories induced by radial thrust with applications to generalized sails

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