对Stribeck摩擦力矩模型进行研究,采用模式识别方法估算速率稳定平台Stribeck摩擦力矩,结合常用电机及负载模型、传感器模型和载体扰动模型等建立速率稳定平台隔离度模型.针对速率稳定平台稳态精度高、响应速度快且稳定裕度大的要求,用频域分析法设计两种控制器,并在MATLAB/Simulink中建立稳定平台控制系统模型进行控制器设计,建立隔离度仿真模型进行仿真和验证.将两种控制器离散化,采用计算机控制,利用实际产品进行试验验证,提出了一种提高稳定平台隔离度的方法.

The ability to search in accordance with standard graphics is one of the key capabilities of IR seeker , which can make up small filed of view and improve the ability of target acquisition . For roll-pitch infrared platform , the searching graphic distortion was analyzed by using the common method that the two orthogonal axes scan in turn . The standard mouth searching was carried out by a new proposed segmented scan method , which a recursively solving spherical arc line constraint equation based on quaternion was used . This segmented method was constrained less and the algorithm was small amount of calculation . It was a more efficient solution to solve the approximation search problem . A virtual simulation system was built using the MATLAB ToolBox and the validity of the segmented scanning method was also proved . This method can not only implement the standard mouth searching pattern at any position in the front hemisphere scene , but also be used for any arbitrary shape search pattern for the analogous seeker .

To enhance the angle measurement precision,two-channel multi-pole resolver is usually used in high precision angle measure system.The angle combination of two-channel multi-pole resolver was studied for a uniform method.According to the analysis of the existing combination algorithms and theoretical error judgment,two kinds of relevant algorithms were presented,which were most error-corrective method,binary combination method under special condition.The first method has the most correction capability and the latter one can be achieved simple and expeditious.The results of both digital simulation and applications in practice system validate the algorithms.

The goal of this study is to present a methodology for obtaining optimal placement of PZT actuator/sensor considering stick effect and measuring noise in active vibration control of a flexible structure.Firstly,the candidate positions are supposed to be finite,and Karlman separate principle is used to obtain the actuator location.Based on the actuator location,the sensor location is found.This methodology does not need to find the optimal placement at the same time.The procedure is greatly simplified,it reduces the optimal numerical computations and gives the optimal placement result when there exists measuring noise.Numerical example of a flexible beam is presented to show that the methodology is efficient and fast,and an uncollated placement result is given,it is different from the common result and the sensor position changes more.

This paper proposes a piecewise model for dynamic damping,considering the structure damping changed by the PZT's dynamical output and the coupling effect between the structure and PZT material in the smart material structure.Due to the coupling effect,the rigidity and damping of the whole structure will change.The static viscosity damping model thus cannot accurately describe the whole structure.On the contrary,the proposed model offers an accurate description for the dynamic output and system magnitude response of the integrated PZT systems,which was verified by experiment results of clamped beam considering three modes.

The most prospective method for certain structural failures and damages that cannot employ redundancy is self-repairing techniques, to ensure especially the maximum flight safety. Based on the characters of self-repairing aircraft, this paper states some basic assumptions of the self-repairing aircraft, and puts forward some special new conceptions concerning the self-repairing aircraft: control input, operating input, command input, repair input and operating and control factor as well as their relationships. Thus it provides a simple and reliable mathematical model structure for the research on the self-repairing control of the aircraft.