This paper studies the sloshing disturbance rejection control(SDRC) problem for liquid-filled spacecrafts, in which the motion of the spacecraft is described by ordinary differential equations(ODEs) and the fluid dyna...
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ISBN:
(纸本)9781509009107
This paper studies the sloshing disturbance rejection control(SDRC) problem for liquid-filled spacecrafts, in which the motion of the spacecraft is described by ordinary differential equations(ODEs) and the fluid dynamics is described by the Burgers' equation with the acceleration due to the inertial force of liquid. The sloshing force is that the fluid, via pressure and viscous effects, exerts on the spacecraft, containing the sloshing disturbance and the inertial force of liquid. The modal decomposition technique is initially applied to the Burgers' equation to derive an infinite dimensional ODE system of coupled slow and fast dynamics, and thus, the sloshing disturbance is divided into two parts: slow and fast. Based on the slow subsystem of the Burgers' equation, an observer is constructed to estimate the slow sloshing disturbance, which is called the slow sloshing disturbance observer(SSDO). Then, a low dimensional SSDO-based H SDRC design is developed in terms of linear matrix inequalities(LMIs), where the slow sloshing disturbance is compensated by the SSDO, and the fast one is attenuated by H control. The resulting controller can ensure that the ODE system of the spacecraft is exponentially stable in the presence of the slow sloshing disturbance and satisfies a prescribed attenuation level in the presence of the fast sloshing disturbance. Finally, the proposed method is applied to the control of a unilateral movement liquid-filled spacecraft to illustrate its effectiveness.
For a reentry warhead with single moving mass,the goal of control in this paper is tracking and stabilization in roll and yaw channel,***,a detailed model of warhead is established using Kane method,and the affine non...
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ISBN:
(纸本)9781467383196
For a reentry warhead with single moving mass,the goal of control in this paper is tracking and stabilization in roll and yaw channel,***,a detailed model of warhead is established using Kane method,and the affine nonlinear form for the control design is *** PID is combined with the nonlinear dynamic inverse to form the attitude controller of the *** the disturbance observer based on extended state observer(ESO) is designed,which is used to observe and compensate for the inaccuracy of the under-actuated *** Moving Mass Nonlinear controller(MMNC) is composed of the controller and the disturbance *** last,simulation and comparison are carried out,the results show that the MMNC has better system response,better adaptability and stronger robustness than the traditional PID controller.
Command and control reconfiguration ability for Unmanned aircraft Systems(UAS) plays an important role in network-centric warfare environment.A novel command and control configuration method based on Service Oriented ...
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ISBN:
(纸本)9781467383196
Command and control reconfiguration ability for Unmanned aircraft Systems(UAS) plays an important role in network-centric warfare environment.A novel command and control configuration method based on Service Oriented Architecture(SOA) for UAS was *** command and control authority for UAS was abstracted as a *** on SOA,the system architecture and interaction mechanism for UAS were established,and dynamic reconfiguration ability for UAS was achieved to complete information interacting and *** simulation system was designed and developed,which was used for *** simulation results proved that the methods and technologies involved was effectively able to solve the problem of command and control configuration for UAS.
Based on the characteristics of loading actuation's work pattern alternately switching between homodromous and converse load during the aircraft structure test especially in the fatigue loading test,an energy opti...
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Based on the characteristics of loading actuation's work pattern alternately switching between homodromous and converse load during the aircraft structure test especially in the fatigue loading test,an energy optimization type of power-by-wire valve-control integrated loading actuation system for aircraft structure test was *** system components and working principle was *** loading scheme of the main and the minor valves working in different loading pattern was *** modeling and simulation work of the energy optimization loading actuation system was *** feasibility of the main and the minor valves working in different loading pattern was *** simulation results demonstrate that the designed energy optimization type of power-by-wire valve-control integrated loading actuation system for aircraft structure test can improve the energy efficiency of the system obviously,and can be widely used in aircraft structural loading test system.
The paper focuses on the problem of energy management for solar-powered aircrafts to plan the flight *** solar-powered unmarried aircrafts,the energy utilization efficiency and energy stored in the energy system influ...
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ISBN:
(纸本)9781467383196
The paper focuses on the problem of energy management for solar-powered aircrafts to plan the flight *** solar-powered unmarried aircrafts,the energy utilization efficiency and energy stored in the energy system influence the *** system of solar-powered aircrafts consists of solar photovoltaic arrays and lithium *** of the challenges is that capacity of lithium batteries is *** increase the endurance,an energy management method based on not only lithium batteries status but also gravity to design the flight path is proposed in this *** on the integrated model of solar-powered aircrafts has been done,which presents the performance of the energy management strategy.
The thorough research and the exploration in the calculation algorithm and a mathematical model of small unmanned aerial vehicle (UAV) obstacle avoi dance and path planning in the static scene were thoroughly res earc...
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ISBN:
(纸本)9781509010882
The thorough research and the exploration in the calculation algorithm and a mathematical model of small unmanned aerial vehicle (UAV) obstacle avoi dance and path planning in the static scene were thoroughly res earched and explored. The mathematical model of small UAV obstacle avoidance and path planning in the static scene was established. Combined with the small UAV flightperformance and the minimum turn radius, a path planning algorithm for small UAV based on Dubins path was proposed. Finally, the algorithm was proved to be effective through the design and simulation verification.
Missile spins can reduce the disturbance caused by asymmetric body,the eccentric of mass and other problem,and can also lead to the attitude control of missile being more *** model of a spin missile is established in ...
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ISBN:
(纸本)9781467383196
Missile spins can reduce the disturbance caused by asymmetric body,the eccentric of mass and other problem,and can also lead to the attitude control of missile being more *** model of a spin missile is established in quasi-body *** system is divided into inner and outer subsystems through time-scale separation *** the controllers of inner loop and the outer loop are both designed by the active disturbance rejection controller(ADRC).The main idea of ADRC is putting the uncertainty of the model,parameters perturbation and unmodelled dynamic as a system of total disturbance,and observing it through the extended state observer,and compensating to system *** shows that the system in the conditions of parameters change and disturbance exist can maintain a good dynamic performance.
Aiming at the trajectory optimization of the solar-powered UAVs (SUAVs) cooperative target tracking in urban environment, the distributed model predictive control (DMPC) method based on Adaptive Grasshopper Optimizati...
Aiming at the trajectory optimization of the solar-powered UAVs (SUAVs) cooperative target tracking in urban environment, the distributed model predictive control (DMPC) method based on Adaptive Grasshopper Optimization Algorithm (AGOA) is proposed in this paper. Firstly, the cooperative target tracking problem in urban environment is modeled by formulating the SUAVs kinematic and target models, the urban environment constraints, solar power harvesting and consumption models for SUAV, and sight occlusions by constructions. Especially, the sight occlusions in urban environment for SUAV are taken into consideration for the first time in this paper. A judgment method of sight occlusions for SUAV is proposed to make the calculation of the energy index more precise. Second, based on the precise modeling, the DMPC method is adopted as the framework for trajectory optimization in real time. Third, AGOA, a novel intelligent algorithm to mimic the behaviors of grasshoppers, is proposed to be the DMPC solver. The proposed AGOA has a better searching ability than the traditional GOA and some other intelligent algorithms by introducing some improvement measures e.g. the natural selection strategy, the democratic decision-making mechanism, and the dynamic feedback mechanism based on the 1/5 Principle. Finally, the effectiveness of the proposed method is demonstrated by the simulations.
In this paper,we present a real-time obstacle avoidance method for fixed-wing unmanned aerial vehicles(UAVs) in complex *** Rapidly-exploring Random Tree(RRT) algorithm is used in this *** order to adapt the RRT algor...
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ISBN:
(纸本)9781467383196
In this paper,we present a real-time obstacle avoidance method for fixed-wing unmanned aerial vehicles(UAVs) in complex *** Rapidly-exploring Random Tree(RRT) algorithm is used in this *** order to adapt the RRT algorithm on fixed-wing platforms,we make extensions on *** algorithm demonstrates very good performance in trajectory planning for fixed-wing vehicles in three-dimensional environment and dynamic *** analyze the algorithm theoretically and provide simulation *** also demonstrate our method on a fixed-wing vehicle flying over a runway with multiple *** application of this method will greatly improve the survival ability of fixed-wing vehicles in complex *** is significant in elevation of autonomous level of UAV.
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