Trajectory Optimization
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Trajectory Optimization of Launch Vehicles Using Object-oriented Programming
ABSTRACT: The aim of this study is to model launch vehicles with focus on 3-DOF trajectory optimization using a modular approach. Despite the large number of operational launch vehicles, they usually consist of basic components and subsystems. In other words, a launch vehicle is an assembly of stages, which in turn is divided into propellant system and engin
J. Aerosp. Technol. Manag.. Publicado em: 13/09/2018
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2. Robust Optimal Adaptive Trajectory Tracking Control of Quadrotor Helicopter
Abstract This paper focuses on robust optimal adaptive control strategy to deal with tracking problem of a quadrotor unmanned aerial vehicle (UAV) in presence of parametric uncertainties, actuator amplitude constraints, and unknown time-varying external disturbances. First, Lyapunov-based indirect adaptive controller optimized by particle swarm optimization
Lat. Am. j. solids struct.. Publicado em: 2017-06
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3. A Model Predictive Guidance Strategy for a Multirotor Aerial Vehicle
ABSTRACT: The present study faces the problem of safely controlling the position trajectory of a multirotor aerial vehicle subjected to a conic constraint on the total thrust vector and a linear convex constraint on the position vector. The problem is solved using a linear state-space model predictive control strategy, whose optimization is made handy by rep
J. Aerosp. Technol. Manag.. Publicado em: 2017-03
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4. TUNING OF MODEL PREDICTIVE CONTROL WITH MULTI-OBJECTIVE OPTIMIZATION
Abstract Two multi-objective optimization based tuning methods for model predictive control are proposed. Both methods consider the minimization of the error between the closed-loop response and an output reference trajectory as tuning goals. The first approach is based on the ranking of the outputs according to their importance to the plant operation and it
Braz. J. Chem. Eng.. Publicado em: 2016-06
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5. Small Solid Propellant Launch Vehicle Mixed Design Optimization Approach
ABSTRACT: For a small country with limited research budget and lack of advanced space technology, it is imperative to find new approaches for the development of low-cost launch vehicles (LV), which is, among all possibilities, an interesting option for rapid access to space, focused on integration of acquired components complemented with indigenously develop
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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6. Theoretical Optimal Trajectories for Reducing the Environmental Impact of Commercial Aircraft Operations
ABSTRACT: This work describes initial results obtained from an ongoing research involving the development of optimization algorithms which are capable of performing multi-disciplinary aircraft trajectory optimization processes. A short description of both the rationale behind the initial selection of a suitable optimization technique and the status of the op
J. Aerosp. Technol. Manag.. Publicado em: 2014-03
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7. Kick Solid Rocket Motor Multidisciplinary Design Optimization Using Genetic Algorithm
ABSTRACT: In this paper, a multidisciplinary design optimization (MDO) approach of a solid propellant kick rocket motor is considered. A genetic algorithm optimization method has been used. The optimized kick solid rocket motor (KSRM) is capable of delivering a small satellite of 200 kg to a circular low earth orbit (LEO) of 600 km altitude. The KSRM should
J. Aerosp. Technol. Manag.. Publicado em: 2013-09
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8. Thermal Protection System and Trajectory Optimization for Orbital Plane Change Aeroassisted Maneuver
ABSTRACT: The aim of this paper was to identify, for a specific maneuver, the optimal combination between the trajectory and the associated heat shield configuration, namely the locations and thicknesses of the ablative and reusable zones, that maximize the allowable payload mass for a spacecraft. The analysis is conducted by considering the coupling between
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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9. Multidisciplinary Design Optimization of Sounding Rocket Fins Shape Using a Tool Called MDO-SONDA
Abstract: Multidisciplinary design optimization is a promising field in aerospace engineering. However, advances in this field have not been applied yet to improve Brazilian sounding rockets, such as the VS-40. Therefore, to give a perspective of the multidisciplinary design optimization in this context, this work presented a case study of this rocket, which
J. Aerosp. Technol. Manag.. Publicado em: 2012-12
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10. Design Optimization of Micro Air Launch Vehicle Using Differential Evolution
Abstract: In this paper, we have used the differential evolution to optimize the design of a Micro Air Launch Vehicle and its launch trajectory. Since trajectory design of a launch vehicle requires prior knowledge of the masses and propulsion performance parameters of the Micro Air Launch Vehicle, whereas the vehicle design requires prior knowledge of the re
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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11. Solving of time varying quadratic optimal control problems by using Bézier control points
In this paper, linear quadratic optial control probles are solved by applying least square method based on Bézier control points. We divide the interval which includes t, into k subintervals and approximate the trajectory and control functions by Bézier curves. We have chosen the Bézier curves as piacewise polynomials of degree three, and determined Bézi
Computational & Applied Mathematics. Publicado em: 2011
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12. On the aubry-mather theory for symbolic dynamics
We propose a new model of ergodic optimization for expanding dynamical systems: the holonomic setting. In fact, we introduce an extension of the standard model used in this theory. The formulation we consider here is quite natural if one wants a meaning for possible variations of a real trajectory under the forward shift. In other contexts (for twist maps, f
Publicado em: 2011