A new composite nonlinear predictive control(NPC) method based on finite-time disturbance observer is proposed for Mars entry drag trajectory tracking. The composite controller uses nonlinear predictive control strate...
详细信息
ISBN:
(纸本)9781467374439
A new composite nonlinear predictive control(NPC) method based on finite-time disturbance observer is proposed for Mars entry drag trajectory tracking. The composite controller uses nonlinear predictive control strategy in a feedback regulation way to obtain desired tracking performance and uses the disturbance estimation based on finite-time disturbance observer(FTDO)to compensate uncertainty in a feedforward way. The proposed guidance law not only compensates the matched disturbance but also the mismatched disturbance. The drag tracking error is also guaranteed to converge to 0 even when the disturbance is time-varying and related with states.
A graphics-based information model of substation and dispatch center is proposed in this *** model adopts the integrative organization of the graphic-model,combining model information with graphic *** combined informa...
详细信息
A graphics-based information model of substation and dispatch center is proposed in this *** model adopts the integrative organization of the graphic-model,combining model information with graphic *** combined information is included in electrical equipment ***,consistency of power grid model information and graphic information is *** graphics-based information model unifies the requirements of IEC61850 standard and IEC61970 standard,which can support collaborative modeling of substation and dispatch *** model,CIM model and SVG graphic can be derived respectively from the graphics-based information *** promotes the unity of the transformer substation standard and dispatch center model standard.
In this paper, sensorless speed control of permanent magnet synchronous motor (PMSM) with an Extended Kalman Filter (EKF) based observer is performed. The general model of the PMSM and EKF algorithm are presented. Sim...
详细信息
ISBN:
(纸本)9781467379120
In this paper, sensorless speed control of permanent magnet synchronous motor (PMSM) with an Extended Kalman Filter (EKF) based observer is performed. The general model of the PMSM and EKF algorithm are presented. Simulation studies are carried out using MATLAB/Simulink, in order to explore effectiveness and usability of EKF in sensorless PMSM drive for washing machine applications. In order to investigate performance of proposed system in real conditions, real torque profile of a washing machine is used. Simulation results illustrate that the proposed system is quite effective for washing machine applications and robust against variations of motor parameters.
This paper proposes an economical method that the phase currents can be measured and reconstructed by means of the leg-shunt resistors in the 3-leg 2-phase vector-controlled inverter for 2-phase induction motor. In ge...
详细信息
Dynamic clustering provides a scalable and energy efficient solution for data transmission in wireless sensor *** the fact that the cluster reorganization can not solve the problem of imbalanced energy consumption in ...
详细信息
ISBN:
(纸本)9781479970186
Dynamic clustering provides a scalable and energy efficient solution for data transmission in wireless sensor *** the fact that the cluster reorganization can not solve the problem of imbalanced energy consumption in the inter-cluster communication,we propose an adaptive routing strategy for cluster-based wireless sensor networks(ARC).The goal of ARC is to balance the energy consumption of nodes by adaptively controlling the modes of intercluster *** ARC,an adaptive energy threshold and a tunable cost function are designed for cluster heads to make routing *** results demonstrate that ARC effectively balances the energy consumption in the inter-cluster communication,and hence improves the energy efficiency and prolongs the network lifetime.
According to the tactical requirements of unmanned aerial vehicle (UAV) for tracking target and avoiding obstacle in complex dynamic environment, a three-dimensional (3D) real-time path planning method is proposed by ...
According to the tactical requirements of unmanned aerial vehicle (UAV) for tracking target and avoiding obstacle in complex dynamic environment, a three-dimensional (3D) real-time path planning method is proposed by combing the improved Lyapunov Guidance Vector Field (LGVF), the Interfered Fluid Dynamical System (IFDS) and the strategy of varying receding-horizon optimization from Model Predictive control (MPC). First, in order to track the moving target in 3D environment, the LGVF method is improved by introducing flight height into the traditional Lyapunov function , and the generated velocity can guide UAV converge gradually to the limit cycle in horizontal plane and the optimal height in vertical plane. Then, the IFDS method imitating the phenomenon of fluid flow is utilized to plan the collision-free path. To achieve the mission of tracking moving target and avoid static or dynamic obstacle at the same time, the guidance vector field by LGVF is taken as the original fluid of IFDS. As the fluid system still remains stable under the influence of obstacles, the disturbed streamline from the interfered fluid can be regarded as the planned path. Third, as the quality of route is mainly influenced by the repulsive and tangential parameters of IFDS, the real-time suboptimal route can be planned by the varying receding-horizon optimization according to the predicted motion. The experimental results prove that the proposed hybrid method is applicable to various dynamic environments.
In the contribution new results in a control design of a general three-dimensional non-holonomic integrator (NHI) including drift terms is proposed. Beside global asymptotic stability (GAS) proposed non-linear control...
详细信息
In the contribution new results in a control design of a general three-dimensional non-holonomic integrator (NHI) including drift terms is proposed. Beside global asymptotic stability (GAS) proposed non-linear controller assure also minimal input norm during transients and in steady states and high dynamic in output response for a piecewise constant reference input. Due to appropriate input modulation internal states follow natural periodic orbits necessary to fulfill non-holonomic constraints. Introducing a non-linear transformation that describe error dynamics feedback stability is proven by using Lyapunov argumentation. Practical value of the proposed design is illustrated on the example of induction machine torque control along with a simulation and experimental results.
In this paper, we present a novel edge based matching approach to target recognition. To recognize the marker on a rotorcraft, a chaotic mutated bat algorithm optimized edge potential function approach is proposed to ...
详细信息
ISBN:
(纸本)9781479984671
In this paper, we present a novel edge based matching approach to target recognition. To recognize the marker on a rotorcraft, a chaotic mutated bat algorithm optimized edge potential function approach is proposed to accomplish the matching between the sketch image and the scene in real applications. A novel type of attractive contour pattern is acquired using the edge potential function. These edge structures can be conveniently exploited for target matching. Bat algorithm is adopted for the optimization problem of searching the optimal match in the scene, and a chaotic mutated bat algorithm is proposed using the chaotic theory and a mutated operator. Thus, the target matching task is converted to optimizing the average of potential value by the processing of translating, reorienting and scaling the sketch image. Series of experiments are conducted to show that our method is superior to other methods. Our proposed method can achieve the higher fitness value over the standard optimization algorithms.
This paper describes the design and analysis of a direct load sensing electro-hydrostatic actuator (EHA) to solve the heating problem of the motor in current EHAs. The design utilizes load sensing technology to automa...
详细信息
This paper describes the design and analysis of a direct load sensing electro-hydrostatic actuator (EHA) to solve the heating problem of the motor in current EHAs. The design utilizes load sensing technology to automatically adjust the variable displacement pump, so that the motor can work in the high efficiency area to reduce the heating. Especially it can significantly enhance the efficiency of EHA under high load and slow rate conditions. Based on analysis of the principle of load sensing EHA, this article demonstrates the feasibility of load sensing EHA. Simulation and experimental data show that direct load sensing EHA can improve motor heating problem and limit energy loss.
Many networks can be modeled as collections of subsystems with complex internal dynamics, which are dynamically coupled according to a weighted digraph. This article characterizes the input-output behavior of a networ...
详细信息
ISBN:
(纸本)9781479978878
Many networks can be modeled as collections of subsystems with complex internal dynamics, which are dynamically coupled according to a weighted digraph. This article characterizes the input-output behavior of a network of coupled homogeneous single-input single-output subsystems, in the case where external actuation and measurement are each applied at a single (but possibly different) component. Precisely, a two-layer transformation of the network's dynamics is undertaken, which makes explicit the roles of 1) the local subsystem model, 2) the network's global interconnections (graph), and 3) the input and output locations, in determining the zeros of the input-output model. The analysis of the zeros via this special-coordinate-basis decomposition shows a parallel with the spectral analysis of the coupled-subsystem model, and directly gives insight into the network's input-output dynamics and its feedback control.
暂无评论