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This paper focuses on the control design and simulation for a hypersonic vehicle with elastic effects. The main characteristic of such vehicles is the strong coupling between the airframe dynamics and propulsion systems. What's more, the elastic coupling between the rigid and elastic body of the vehicle during the flight must be considered when designing the controller. This paper first derive the...
This paper describes the environmental influence to the Unmanned Aerial Vehicle(UAV) flight, and then elaborates the importance of anti-interference technology in the UAV design. Through the analysis of UAV flight data and the drawback of the traditional design method about anti-interference, the paper show a method suitable for UAV, which is based on an embedded operating system-VxWorks. The method...
Due to the low PF (Power Factor, PF) of high-power and high-voltage electronic motor, the reactive power consumed during the soft starting period and the operating period are different. This paper proposes a dynamic reactive power compensation method for high-power and high-voltage electronic motors based on self-adaptive fuzzy PID control to stabilize power grid voltage and reduce energy consumption...
It has a great military significance to detect the magnetic target by magnetic gradiometer system. The positional accuracy of magnetic target will be affected by the installation error of magnetometer in the magnetic gradiometer system. The relationship between the localization results and the installation error is analysed in this paper. The results show that the localization error of magnetic target...
As a kind of typical nonlinearity, actuator position saturation (APS) can severely limit the whole performance of flight control system, and even lead to the undesirable inaccuracy and instability of flying aircraft. However, the APS nonlinear characteristic is usually ignored in the traditional design process of flight control system. Taking the pitching channel as example, a design model considering...
We consider a credible routing in Ad Hoc network for DOS attack problems. This paper presents a probabilistic packet marking location technology, describes the source packet marking attack node localization method, and here we build the attack source reliable positioning model based on probabilistic packet marking. In this case, we provide that the data source in Ad Hoc network can back and transmission...
In this work, a wide dual-band circularly polarized antenna for GPS high-precision survey is proposed and investigated. This antenna is realized by two stacked microstrip patches. Each patch is fed by four ports with orthogonal distribution on the plane, and the four ports are stimulated by separate signals which have same amplitude but 90 degree phase-shift in a clockwise direction. The present antenna...
State feedback H∞ control problem for switched linear singularly perturbed systems (SLSPSs) is investigated in this paper. A switched linear singularly perturbed model is constructed to describe uncertain singularly perturbed systems. State feedback H∞ controller gains are obtained by solving a set of linear matrix inequalities (LMIs). A numerical example is presented to illustrate the effectiveness...
In the attitude measurement system, Unscented Kalman filter algorithm based on quaternion has been developed according to the problems of noise and drift by the three-axis MEMS gyroscope, three-axis MEMS accelerometer and three-axis MEMS magnetometer. According to the principle of strap down inertial navigation, the paper developed the attitude-updating algorithm based on the quaternion, the mathematics...
UAV flight test for scientific phases has a high accident rate, especially for autonomous landing. UAV ground monitoring system is an essential approach to reducing the risk for UAV autonomous landing, and recognition system is the core of system. This paper discusses recognition system for UAV autonomous landing. However, traditional supervised learning usually suffers from expensive labeling in...
For the problem of aero engine gas path fault diagnosis, the diagnosis results of RBF neural network, BP neural network and support vector machine (SVM) are fused at decision level with the D-S evidence theory, the results show that D-S evidence theory can achieve better diagnosis efficiency than the other three theories in separation, and it can reduce the misdiagnosis rate and improve the diagnostic...
Manned asteroid exploration has several different constraints comparing with unmanned exploration. For example, the time of mission should not be too long to ensure plenty food and water supplement. Besides, after landing on the asteroid, the explorer should stay a little time to complete certain tasks before leaving. At the same time, mass changing such as discarding of garbage and releasing of scientific...
According to hypersonic flight vehicles of highly nonlinear and strong coupling characteristics, RBF neural network (RBFNN) based sliding mode controller is proposed. This aircraft model is multivariable, unstable and assumed to have unknown dynamics. The unknown dynamics is due to the parameters uncertainties. The uncertainty parameters are approximated by RBFNN. Sliding mode control has the flaw...
This paper presents a mathematical model of torque motor based on the magnetic circuit method. Through establishing equivalent magnetic circuit, the internal magnetic field of torque motor is analyzed. Following that, the output torque can be calculated. The results of this model are verified by three-dimension finite element analysis and conform well with the analysis. Our obtained results can be...
A nonlinear robust flight control strategy is proposed to solve the robust attitude control problem for the reentry vehicle. Firstly, a time-varying sliding surface with finite time convergence and the corresponding chattering-free sliding mode control are designed respectively. The time-varying function can guarantee global robustness, and the chattering phenomena can be eliminated by using the low...
For the measurements selection in the component health parameter estimation of turbofan engine, the paper proposes an optimization method. It gives a combination of measurement parameters selection through the health parameters correlation analysis and the condition number of coefficient matrix analysis. The linear estimation method of components health parameters is presented on the basis of measurement...
This paper studies the problem of aerial maneuvering control, which is formulated as a multi-objective sequential decision making problem, and is solved by the Multi-Objective Monte-Carlo Tree Search (MOMCTS) algorithm which requires little prior knowledge about the specific maneuvering procedure, and achieves the desired maneuvering trajectory through multi-objective optimization. The proposed method...
For the problem of poor real-time performance in single machine simulation as a result of complex model, based on the characteristics of reflective memory network transmission, this paper proposes a distributed simulation system of on-orbit rescue of spatial non-cooperative targets. The system possesses the function to simulate on-orbit states of different stages, such as the process of approaching,...
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