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Research on Aerobomb Actuator Loading System

Author: FanJinHua
Tutor: LvMing
School: National University of Defense Science and Technology
Course: Control Science and Engineering
Keywords: Rudder Loading System Excess force Structure invariance principle Optimal Control Robust Tracking with interference suppression Variable Structure Control Adaptive control
CLC: TJ410.6
Type: Master's thesis
Year: 2007
Downloads: 276
Quote: 1
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Abstract

Actuator loading system for analog bombs rudder system load and detect steering gear performance, is an important part of the semi-physical simulation system for cruise missiles. With cruise missiles flying performance improvement, the development of the rudder system, load simulation technology put forward higher requirements. Electric loading system in recent years, a hot research, many of the problems to be studied. This article is based on motor actuator loading system as power equipment. The paper summarizes the progress of loading technology, and several basic problems that exist in the loading system. Then, according to the requirements of the system indicators, respectively, from the system structure and model, analysis, control depth theoretical analysis and simulation study of three aspects of the system. The basic structure of the papers given actuator loading system analyze their works, and to establish system mathematical model. Need to adjust according to the system of local parameters proposed in the spring lever and inertia disk system structure and the analysis of the structural parameters of the two parts of the important role in the implementation of the system performance tuning and extra force compensation. Due to the stability of the basic requirements of the system to work, the mechanical resonance characteristics restrict bandwidth system load papers from mechanical resonance characteristics and stability of the system, this paper proposes a method to determine the range of the moment of inertia of the stiffness of the spring rod and inertia disk, and pointed out that under certain conditions, the system can be open-loop stable. For steering gear movement caused excess force on the system performance, based on the structural invariance principle, to the steering gear speed DC motor speed and steering gear control command signal, given three extra force compensation method for observables. Optimal control method is simple, easy to implement, the paper examines the application of optimal control actuator loading system. For linear quadratic approximate optimal control of the steady-state error, proposed the introduction of integral control in optimal control, respectively, with the transfer function and the state space model implementation. Quadratic performance index for the system response speed, adjust the time with the pole of the real part of the relationship, adding the desired degree of attenuation to adjust the response speed of the system. Rudder Loading System nonlinear, time-varying uncertainties, and the approximate optimal control solution approximation and robustness poor unfavorable factors, robust tracking and interference suppression method is loaded Application of the system. The method proposed tracking system specifically for deterministic disturbances can make the system asymptotically track the reference input while suppressing deterministic disturbances on the system performance, and the suppression of the disturbances caused by the changes in the system parameters, it is suitable rudder The machine loaded system. The paper explains the basic principle of the method and the design of the system controller. Taking into account based on the transfer function method for solving the difficulties and accuracy, the robust tracking and interference suppression method in the state space. According to the basic principle of robust progressive regulator, combined with optimal control method, the robust tracking and interference suppression method is applied to the actuator loading system. Robust tracking and interference suppression method is based on the internal model principle, the accuracy and the controller to achieve the accuracy of the input signal has very high requirements, and the controller parameters and the input signal corresponding to the frequency when the signal frequency is changed, the control The parameters will change, bring inconvenience to the system design. Variable structure control to take advantage of the sliding mode system with self-adaptive interference reaching condition flexible control structure to provide more possibilities for the engineering design problems, the commonly used method of uncertain systems. The paper presents a design method of variable structure loading system, pointed out that the introduction of integral strategy augmented system state equation and then design the variable structure control law. Simulation results show the effectiveness of the method, the inhibition of excess force, improve the system tracking accuracy. The systems control law design, the use of the optimal sliding surface of the the final sliding mode structure, and exponential reaching law to make the system asymptotically stable. This method solves the traditional variable structure control method extra force to suppress the poor performance problems. And because only a sliding mode variable structure system for the design, construction is not complicated. In practical applications, due to the inertia of the mechanical, electrical, and other aspects of the ideal switching characteristics can not meet the variable structure control system inevitably there will be buffeting. Taking into account the structural invariance principle can effectively inhibit excess force extraneous force compensation is able to adapt to changes in system parameters, and paper proposes a structure adaptive extraneous force compensation method. This method by constructing a suitable feedforward controller, combined with the conventional model reference adaptive control methods, select appropriate Lyapunov function, Lyapunov stability theorem proving asymptotic stability of the system, the adaptive law, the system controller with adaptive. The simulation results show that this method is effective to suppress the excess force system tracking performance.

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