scholarly journals Procedure for forming nominal control program of solar sail spacecraft heliocentric movement using locally optimal control laws

2020 ◽  
Vol 4 (1) ◽  
pp. 5-13
Author(s):  
R. M. Khabibullin
Keyword(s):  
Optimal Control ◽  
Control Program ◽  
Solar Sail ◽  
Flight Trajectory ◽  
Control Laws ◽  
Phase Coordinates ◽  
Control Scheme ◽  
Control Schemes ◽  
Efficient Control ◽  
Interplanetary Flight

The paper is devoted to the non-coplanar interplanetary flight Earth-Venus of the spacecraft equipped with a solar sail. The goal of the heliocentric movement is to transfer a spacecraft with a non-perfectly reflecting solar sail into the Hill’s sphere of the Venus with zero hyperbolic excess speed. The magnitude and direction of acceleration is calculated taking into account specular and diffuse reflections, absorption and transmission of photons by the surface of the solar sail. One of the main tasks in the field of navigation and motion control of a spacecraft is the search for a simple energy-efficient control scheme for performing maneuvers during flight. These control schemes are locally optimal control laws, various combinations of which allow you to perform the necessary maneuvers during an interplanetary flight. The procedure for the formation of a control program for a non-coplanar interplanetary flight of the Earth-Venus type of a spacecraft with a non-perfectly reflecting solar sail is described. The results include the flight trajectory, the change in phase coordinates in time, graphs of changes in control angles, and the nominal control program. The obtained results satisfy all the boundary conditions described in the statement of the problem.

scholarly journals Control program for noncoplanar heliocentric flight to Venus of non-perfectly reflecting solar sail spacecraft

2020 ◽  
Vol 18 (4) ◽  
pp. 117-128 ◽  
Author(s):  
R. M. Khabibullin
Keyword(s):  
Thin Film ◽  
Optimal Control ◽  
Control Program ◽  
Solar Sail ◽  
Motion Simulation ◽  
Flight Trajectory ◽  
Control Laws ◽  
Osculating Elements

A noncoplanar controlled heliocentric flight to Venus of a spacecraft with a non-perfectly reflecting solar sail is considered. The aim of the heliocentric flight is to get a spacecraft into Hill sphere of Venus with zero hyperbolic excess velocity. An algorithm has been developed for applying the locally optimal control laws for the fastest change of the osculating elements. Solar sail orientation is controlled by thin-film control elements arranged along the solar sail surface perimeter. The flight trajectory, the control program and the required width and area of thin-film control elements are obtained as a result of motion simulation.

Control Scheme of Novel Pressurized Stripper and the Industrial Implementation

2012 ◽  
Vol 241-244 ◽  
pp. 1184-1190
Author(s):  
Da Chun Feng ◽  
Ming Pan ◽  
Yu Qian ◽  
Xin Wu Wang
Keyword(s):  
Optimal Control ◽  
Sensitivity Analysis ◽  
Control System ◽  
Dynamic Simulation ◽  
Coal Gasification ◽  
Oil Refining ◽  
Control Scheme ◽  
Control Schemes ◽  
Optimal Control Scheme ◽  
Sour Gas

A novel pressurized stripper with side-draw has been implemented successfully in coal-gasification industry and oil-refining industry. In this complex stripping process, ammonia and sour gas can be removed effectively from wastewater with ammonia and sour gas. However, compared to simple strippers, the complex pressurized strippers have rarely been considered for dynamic optimization before. In this paper, the dynamic simulation and optimal control of the novel stripper are proposed to improve the overall cost-effectiveness of the whole process. First of all, sensitivity analysis is proposed to find the sensitive plates in stripper with steady state simulation. Based on the sensitivity analysis, two control schemes are built up. And then, the rejecting disturbance capabilities of the two control schemes are compared and testified by using dynamic simulation. Finally, the optimal control scheme is implemented in industry with distributed control system (DCS). A real industrial application demonstrates that relies on the installed control system, the new stripping process can run steadily, consume less energy and satisfy the product quality requirements even though an uncertain disturbance occurs.

An Analysis of Guided Motion of a Research Spacecraft with a Solar Sail

2019 ◽  
pp. 94-103
Author(s):  
R.M. Khabibullin ◽  
O.L. Starinova
Keyword(s):  
Mathematical Model ◽  
Optimal Control ◽  
Finite Element ◽  
Finite Element Model ◽  
Coordinate System ◽  
Element Model ◽  
Solar Sail ◽  
Motion Simulation ◽  
Control Laws ◽  
Controlled Motion

The paper considers guided motion of a research spacecraft with a frame-type solar sail. When scheduled turns of the solar sail are performed, disturbing forces appear, the characteristics of which depend on the solar sail design. It is necessary to take into account the design features of the solar sail to analyze the controlled motion of the spacecraft. A finite element model of a frame-type solar sail spacecraft construction is developed. A mathematical model of motion in the combined helio-centric coordinate system is described. Local-optimal control laws of orbit elements maintenance and correction are formulated. The software developed for simulating the motion of a spacecraft with a solar sail in the heliocentric coordinate system is used in this study. The analysis of the data obtained during motion simulation demonstrates the feasibility of using the solar sail technology for interplanetary flights.

An algorithm for controlling the spatial motion of a spacecraft with an imperfectly reflecting solar sail based on the laws of locally optimal control for Earth — Mars heliocentric flight

2020 ◽  
Author(s):  
R.M. Khabibullin ◽  
O.L. Starinova
Keyword(s):  
Optimal Control ◽  
Control Algorithm ◽  
Center Of Mass ◽  
Control Program ◽  
Solar Sail ◽  
Design Parameters ◽  
Motion Simulation ◽  
Light Pressure ◽  
Spacecraft Control ◽  
Osculating Elements

The article considers a spatial controlled heliocentric Earth-Mars flight of a spacecraft with an imperfectly reflecting solar sail. A new mathematical model of motion is described taking into account the dynamics of motion relative to the center of mass under the forces and moments from light pressure. A spacecraft control algorithm for implementing the flight is formed on the basis of the laws of locally optimal control for the fastest change of osculating elements. The orientation of the solar sail is controlled using thin-film control elements located around the perimeter of the solar sail surface. As a result of motion simulation, the duration and trajectory of the flight, the control program and the necessary design parameters of a spacecraft with a solar sail are determined.

scholarly journals Simplifying the Development of Programs for Digital Engine Controllers

1980 ◽  
Author(s):  
D. A. Rutherford
Keyword(s):  
Control Systems ◽  
Control Program ◽  
Engine Control ◽  
Video Display ◽  
Control Programs ◽  
Display Unit ◽  
Control Scheme ◽  
Control Schemes ◽  
High Level ◽  
Video Display Unit

The paper describes a method of simplifying the preparation and development of control programs for microprocessor-based engine control systems. The system described employs a video display unit, VDU, connected to the digital controller. Programs are prepared in a simple high level language tailored to the requirements of engine control schemes. The paper also describes the internal software structure and features that are provided. An example of the procedures used to develop a simple control program illustrates how a user can concentrate on the control scheme rather than on software problems.

scholarly journals Adaptive nonlinear optimal control for active suppression of airfoil flutter via a novel neural-network-based controller

2018 ◽  
Vol 24 (22) ◽  
pp. 5261-5272 ◽  
Author(s):  
Difan Tang ◽  
Lei Chen ◽  
Zhao F. Tian ◽  
Eric Hu
Keyword(s):  
Optimal Control ◽  
Nonlinear Systems ◽  
Linear Matrix ◽  
Nonlinear Controller ◽  
Control Laws ◽  
Active Suppression ◽  
Value Function Approximation ◽  
Control Scheme ◽  
New Form ◽  
Hamilton Jacobi Bellman

This paper proposes a novel adaptive nonlinear controller based on neural-networks (NNs) for active suppression of airfoil flutter (ASAF) from the optimal control perspective. Optimal control laws for locally nonlinear systems are synthesized in real time by solving the Hamilton–Jacobi–Bellman equation online with a proposed new form of NN-based value function approximation (VFA) and an extended Kalman filter. A systematic procedure based on linear matrix inequalities is further proposed for designing a scheduled parameter matrix that generalizes the new form of VFA to globally nonlinear systems to suit ASAF applications. Un-modeled dynamics are captured using an NN identifier. Comparisons drawn with a linear-parameter-varying optimal controller in wind-tunnel experiments confirm the effectiveness and validity of the proposed control scheme.

scholarly journals Heliocentric Solar Sail Orbit Transfers with Locally Optimal Control Laws

2007 ◽  
Vol 44 (1) ◽  
pp. 273-276 ◽  
Author(s):  
Malcolm Macdonald ◽  
Colin R. McInnes ◽  
Bernd Dachwald
Keyword(s):  
Optimal Control ◽  
Solar Sail ◽  
Control Laws

scholarly journals Nonlinear Current-Mode Control of SCIG Wind Turbines

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 55
Author(s):  
Nicholas Hawkins ◽  
Bhagyashri Bhagwat ◽  
Michael L. McIntyre
Keyword(s):  
Current Mode ◽  
Nonlinear Controller ◽  
Flux Observer ◽  
Current Mode Control ◽  
Mode Control ◽  
Squirrel Cage ◽  
Control Scheme ◽  
Control Schemes ◽  
Rotor Flux ◽  
Squirrel Cage Induction Generator

In this paper, a nonlinear controller is proposed to manage the rotational speed of a full-variable Squirrel Cage Induction Generator wind turbine. This control scheme improves upon tractional vector controllers by removing the need for a rotor flux observer. Additionally, the proposed controller manages the performance through turbulent wind conditions by accounting for unmeasurable wind torque dynamics. This model-based approach utilizes a current-based control in place of traditional voltage-mode control and is validated using a Lyapunov-based stability analysis. The proposed scheme is compared to a linear vector controller through simulation results. These results demonstrate that the proposed controller is far more robust to wind turbulence than traditional control schemes.

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