检索结果-南通市图书馆

Gain-Scheduling H_∞ autopilot Design for Tactical Missiles with Variable-Swept Wings

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2015年第1期22卷 117-123页

作者： Hongyang Bai Ruisheng Sun Weiming Li Xiulai Wang School of Energy and Power Engineering Nanjing University of Science and Technology Shandong Institute of Aerospace Electronic Technology School of Command Information System PLA University of Science and Technology

A new approach to gain-scheduling of H∞controllers is proposed for a cruise missile with variableswept wings( VSW) in bank-to-turn( BTT) mode. A nonlinear dynamic model is established and anticipant performance criterions are given at first. For the selected operating points,feedback robust controllers of threechannels are designed independently to restrain cross-channel couple disturbances and aerodynamic perturbations. Then,the sweepback and Ma number are selected to schedule controller gains iteratively to ensure all closed-loop poles locating inside the desired region. The proposed method here attempts to extend the performance of initial design obtained for a single arbitrary point to the whole linearized domain while maintaining the expected stability over the entire range of sweepback and full flight envelope. Some time-domain analysis procedures based on the proposed method are carried out and assessed,while the performance of tracking and robustness to aerodynamic perturbations in different situations are contrasted by some nonlinear simulations. Finally,the numerical simulations demonstrate that the proposed autopilot design method has better tracking performance and is robust,effective and feasible.

关键词： gain-scheduling robust autopilot variable-swept wi

H_∞ autopilot Design for Autonomous Underwater Vehicles

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2010年第2期15卷 194-198页

作者：冯正平 R. ALLEN School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong University Institute of Sound and Vibration Research University of SouthamptonSouthampton SO17 1BJUnited Kingdom

The design approach of H∞ autopilot for autonomous underwater vehicles (AUVs) is proposed. Comprised by the three sub-controllers,i.e. speed,heading and depth controllers,the designed autopilot has advantage over existing H∞ control of AUVs. The overshoot in speed,heading and depth control systems under step commands is restricted by refining the weighting function for robust stability. The dynamic performance of heading and depth control systems is improved by feeding back yaw rate and pitch angle,respectively. To evaluate the design approach,it is then utilized to synthesize the autopilot for flight control of Subzero Ⅲ,a low cost test-bed for AUV control techniques. Both simulations and water trails verify the effectiveness of the design approach.

关键词： autonomous underwater vehicle (AUV) autopilot H∞ control weighting function

Design and Simulation of BTT Missile with High-Aspect-Ratio Wing Robust H_∞ autopilot

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2007年第1期16卷 50-55页

作者：崔生旺刘莉马春艳 School of Aerospace Science and Engineering Beijing Institute of Technology Beijing 100081China

For the strong coupling among the channels of bank-to-turn （BTT） missile with high-aspect-ratio wing, an autopilot is designed with a two loop control structure robust autopilot design methods. By the inner loop design, the question of pole-zero cancellation is solved, and the stabilization of structured uncertainty is achieved. Through the outer loop of H∞ controller design, the flying performance and robustness can be guaranteed. The nonlinear simulation results show that the autopilot designed has perfect time domain response, and can suppress bad influence of the inertial and kinematics couplings. It can make the missile fly stably in the large flying areas. The control is very effective.

关键词： bank-to-turn robust autopilot coupling high-aspect-ratio

BTT autopilot design for agile missiles with aerodynamic uncertainty

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第4期26卷 802-812页

作者： Yueyue Ma Jie Guo Shengjing Tang School of Aerospace Engineering Beijing Institute of Technology

The approach to the synthesis of autopilot with aerody- namic uncertainty is investigated in order to achieve large maneu- verability of agile missiles. The dynamics of the agile missile with reaction-jet control system （RCS） are presented. Subsequently, the cascade control scheme based on the bank-to-turn （B-I-T） steering technique is described. To address the aerodynamic un- certainties encountered by the control system, the active distur- bance rejection control （ADRC） method is introduced in the autopi- lot design. Furthermore, a compound controller, using extended state observer （ESO） to online estimate system uncertainties and calculate derivative of command signals, is designed based on dynamic surface control （DSC）. Nonlinear simulation results show the feasibility of the proposed approach and validate the robust- ness of the controller with severe unmodeled dynamics.

关键词： agile missile autopilot high angle of attack active dis-turbance rejection control (ADRC) dynamic surface control (DSC),extended state observer (ESO).

Rudder Roll Damping autopilot Using Dual Extended Kalman Filter–Trained Neural Networks for Ships in Waves

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2019年第4期18卷 510-521页

作者： Yuanyuan Wang Hung Duc Nguyen National Center for Maritime Engineering and Hydrodynamics Australian Maritime College University of Tasmania

The roll motions of ships advancing in heavy seas have severe impacts on the safety of crews,vessels,and cargoes;thus,it must be *** study presents the design of a rudder roll damping autopilot by utilizing the dual extended Kalman filter(DEKF)trained radial basis function neural networks(RBFNN)for the surface *** autopilot system constitutes the roll reduction controller and the yaw motion controller implemented in *** analyzing the advantages of the DEKF-trained RBFNN control method theoretically,the ship’s nonlinear model with environmental disturbances was employed to verify the performance of the proposed stabilization *** sailing scenarios were conducted to investigate the motion responses of the ship in *** results demonstrate that the DEKF RBFNN based control system is efficient and practical in reducing roll motions and following the path for the ship sailing in waves only through rudder actions.

关键词： Rudder roll damping autopilot Radial basis function Neural networks Dual extended Kalman filter training Intelligent control Path following Advancing in waves

Effect of autopilot Structure on Proportional Navigation Guidance

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2007年第2期16卷 177-181页

作者：夏群力刘轶英祁载康 School of Aerospace Science and Engineering Beijing Institute of Technology

The dynamic characteristics of acceleration autopilot and attitude autopilot are *** in detail. Also, a comparison study was made between these two different types of control schemes for guidance loop. By means of simulation, it is concluded that the guidance accuracy is mainly determined by the slowest subsystem among different system dynamics. For air-to-ground missiles, with limited terminal guidance time, the control scheme of acceleration autopilot combined with proportional navigation guidance （PNG） law is the better choice.

关键词： autopilot guidance law guidance and control guidance accuracy

Control algorithm of YUPENG ship autopilot based on tangent function nonlinear feedback

在线全文

学校读者我要写书评

暂无评论

Journal of Measurement Science and Instrumentation 2017年第1期8卷 78-83页

作者： ZHANG Xian-ku FENG Yong-xiao Laboratory of Marine Simulation and Control Dalian Maritime University Dalian 116026 China

autopilot is an important navigation instrument,and it plays an important role in safe navigation In order to further improve the performance of the autopilot,this paper adopts the first-order closed loop gain shaping algorithm(PID)to designautopilot control algo rithm with robustness and uses tangent function nonlinear feedback technology to replace the linear feedback to improve the energy saving effect of *** Dalian Maritime University’s newly-built YUPENG ship as anexample,the simulation research is carried *** results show that the control effect is still satisfactory when the model parameterschange by25%,which suggests that the designed autopilot algorithm has good *** with linearfeedback,nonlinear feedback can save7.9%of *** algo rithm proposed in this paper is simple and has obvious *** the same time,the control algorithm is also helpful for the localization of controller design

关键词： autopilot nonlinear feedback tangent YUPENG ship

LQR Integrated with Fuzzy Control for Aerial Refueling autopilot

在线全文

学校读者我要写书评

暂无评论

Computer Aided Drafting,Design and Manufacturing 2007年第1期17卷 30-39页

作者： AHMED Momtaz School of Astronautics Beijing University of Aeronautics and Astronautics

Linear Quadratic Regulator （LQR） is modem linear control that is suitable for multivariable state feedback and is known to yield good performance for linear systems or for nonlinear systems where the nonlinear aspects are presented. The fuzzy control is known to have the ability to deal with nonlinearities without having to use advanced mathematics. The LQR integrated fuzzy control （LQRIFC） simultaneously makes use of the good performance of LQR in the region close to switching curve, and the effectiveness of fuzzy control in region away from switching curve. A new analysis of the fuzzy system behavior presented helps to make possible precise integration of LQR features into fuzzy control. The LQRIFC is verified by simulation to suppress the uncertainty instability more effectively than the LQR besides minimizing the time of the mission proposed.

关键词： fuzzy control linear quadratic regulator aerial refueling autopilot

Robust autopilot with wave filter for ship steering

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2006年第2期5卷 24-29页

作者： WANG Xian-zhou XU Han-zhen Department of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China

Research was done to overcome traditional problems associated with automatic steering systems of a ship in a seaway. A ship’s dynamic model with wave disturbances was built and a wave filter was designed by means of an extended states observer (ESO). The model estimated the low frequency motion component from a heading measurement corrupted by colorednoise, so back-and-forth steering caused by high frequency wave disturbances was avoided. At the same time, a robust autopilot system, designed by variable structure control theory, was presented. Simulation results achieved in dangerous sea status show that the wave filter works very well and the autopilot has strong robustness to environmental disturbances and model perturbation, and more importantly, the frequency of rudder adjustments is reduced noticeably.

关键词： autopilot wave disturbances variable structure control wave filter extended states observer (ESO)