Safety of gyroplane is so widely accepted that a study of the stability and control characteristics is *** on the dynamic model,sliding mode control method is adopted to ensure its longitudinal ***,for traditional sli...
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ISBN:
(纸本)9781479946983
Safety of gyroplane is so widely accepted that a study of the stability and control characteristics is *** on the dynamic model,sliding mode control method is adopted to ensure its longitudinal ***,for traditional sliding mode control,the switching control term brings the chattering *** a fuzzy sliding mode control system,based on Mamdani fuzzy switching strategy,is designed to improve the longitudinal dynamic stability *** demonstrated that the proposed control method has an excellent dynamic performance and the chattering phenomena can be attenuated effectively.
The referenced quadrotor helicopter in this paper has a unique configuration. It is more complex than commonly used quadrotors because of its inaccurate parameters, unideal symmetrical structure and unknown nonlinear ...
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Brushless direct current (BLDC) motor is widely used in small and medium side electric vehicles as it exhibit highest specific power and thermal efficiency compared with induction motor. The permanent magnets in the r...
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Brushless direct current (BLDC) motor is widely used in small and medium side electric vehicles as it exhibit highest specific power and thermal efficiency compared with induction motor. The permanent magnets in the rotor create a constant magnetic flux, which limit the motor top speed. As the back electromotive force (EMF) voltage increases proportionally with motor rotational speed and it approaches the amplitude of the input voltage, the phase current amplitude will reach zero. By advancing the phase current, it is possible to extend the maximum speed of the BLDC motor beyond the rated top speed. This will allow smaller BLDC motor to be used in small electric vehicles and in larger applications will allow the use of BLDC motor without the use of multispeed transmission unit for high speed operation. Adjusting the phase angle will affect the speed of the motor as the each coil is energized earlier than the corresponding rise in back emf of the coil. Preliminary test results indicated that the motor top speed can be increased at least by 40 percent over the baseline speed at no load condition.
This paper describes a planning algorithm based on airborne for UAV to track and intercept moving target in the presence of dynamic obstacles and considering the maneuvering characteristics of the Unmanned Aerial Vehi...
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ISBN:
(纸本)9781479946983
This paper describes a planning algorithm based on airborne for UAV to track and intercept moving target in the presence of dynamic obstacles and considering the maneuvering characteristics of the Unmanned Aerial Vehicle (UAV).In the context of ensuring airborne sensor (camera) to keep track of the target,the approach can generate time-optimal speed commands for UAV in dynamic environment to intercept the target after discovering *** filtering the velocity instruction and considering the acceleration performance to generate reachable velocity *** of this method is that the coordinates of the UAV and the coordinates of moving targets and obstacles in the range of airborne sensors can be obtained in real *** simulation and experimental result show that this method can effectively ensure the moving target tracking and interception in dynamic environment.
In this paper,an improved differential search(DS)algorithm was proposed to solve the trajectory planning *** DS algorithm is a new kind of evolutionary algorithm that developes rapidly ***,slow convergence speed and e...
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In this paper,an improved differential search(DS)algorithm was proposed to solve the trajectory planning *** DS algorithm is a new kind of evolutionary algorithm that developes rapidly ***,slow convergence speed and easily trapping into local optimum of the DS algorithm are the main disadvantages that limit its further *** overcome the disadvantages of DS algorithm,we propose a quantum differential search(QDS)algorithm for solving the three dimensional trajectory planning of unmanned aerial vehicles(UAVs)in this *** is a combination of quantum theory and principles of differential search *** using the quantum strategy,the improved DS algorithm can escape the local *** non-winner particles are mutated by quantum theory and the global best position is mutated by using the small extent of disturbance according to the variance ratio of *** of experimental results demonstrate the feasibility,effectiveness and robustness of our proposed *** results show that the proposed QDS algorithm can effectively improve both the global searching ability and the speed of convergence.
As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. Ho...
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This paper is concerned with the infinite horizon H∞ filtering problem for nonlinear stochastic systems with timedelay. For general delayed nonlinear stochastic systems, the conditions of H∞ filtering are usually gi...
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This paper is concerned with the infinite horizon H∞ filtering problem for nonlinear stochastic systems with timedelay. For general delayed nonlinear stochastic systems, the conditions of H∞ filtering are usually given in terms of HamiltonJacobi inequalities(HJIs), which are difficult to solve. In this paper, the delayed nonlinear stochastic systems are modeled based on the T-S fuzzy model. The exponential mean square H∞ filter of delayed nonlinear stochastic systems is proposed via solving a set of linear matrix inequalities(LMIs) instead of HJIs. A numerical example is presented to show the effectiveness of the proposed method.
Autogyro or gyroplane as the first rotorcraft and a type of classical V/STOL aerial vehicle has become a hot point in academia and *** have been achieved in many research areas such as aerodynamics,structure,flight dy...
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ISBN:
(纸本)9781479946983
Autogyro or gyroplane as the first rotorcraft and a type of classical V/STOL aerial vehicle has become a hot point in academia and *** have been achieved in many research areas such as aerodynamics,structure,flight dynamics,modeling *** a sparse contemporary research on autogyro emphasizes the control of autogyro/*** motivation is to design an autopilot for an unmanned ***,the unmanned gyroplane was designed based on an advanced radio-controlled gyroplane and the PX4 open-source flight management ***,dynamics model was obtained through the CFD and aerodynamic estimation method.A fly-to-trim method was used to trim the aircraft and stability characteristics were analyzed at different ***,the attitude controller was designed with incremental nonlinear dynamic inversion method.
In the building climate control area, the linear model predictive control (LMPC)—nowadays considered a mature technique—benefits from the fact that the resulting optimization task is convex (thus easily and quickly ...
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In the building climate control area, the linear model predictive control (LMPC)—nowadays considered a mature technique—benefits from the fact that the resulting optimization task is convex (thus easily and quickly solvable). On the other hand, while nonlinear model predictive control (NMPC) using a more detailed nonlinear model of a building takes advantage of its more accurate predictions and the fact that it attacks the optimization task more directly, it requires more involved ways of solving the non-convex optimization problem. In this paper, the gap between LMPC and NMPC is bridged by introducing several variants of linear time-varying model predictive controller (LTVMPC). Making use of linear time-varying model of the controlled building, LTVMPC obtains predictions which are closer to reality than those of linear time invariant model while still keeping the optimization task convex and less computationally demanding than in the case of NMPC. The concept of LTVMPC is verified on a set of numerical experiments performed using a high fidelity model created in a building simulation environment and compared to the previously mentioned alternatives (LMPC and NMPC) looking at both the control performance and the computational requirements.
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