The research on autonomous navigation and orbital keeping technology of geosynchronous satellites : selecting position vector in the inertia space and longitude , latitude , radial errors in the hill equation as state variables , the precision of orbit determination caused by track dynamic model error , sampling period , and sensor measurement and install error is analyzed 同步卫星自主导航与轨道保持技术研究：分别选取惯性空间位置矢量和采用hill方程表示的经、纬、向径误差作为状态量，分析轨道动力学模型误差、采样周期以及敏感器测量、安装等误差对定轨精度的影响。
First , the theory of fretting wear and studies on fretting fatigue were introduced and the parametric method was used in the process of creating the model of dovetail joints in ug software . the elastic contact problem is analyzed in finite element method ( fem ) and is used to the parameters " distribution and contact stress of the joint are obtained on the base of ansys code . with the effect factor of load frequency , the prediction method of fretting fatigue life of dovetail joint under low and high / low cycle complex load is proposed 本文介绍了微动损伤的机理和微动疲劳寿命的研究方法；利用ug软件对燕尾榫联接结构创建了参数化实体模型；基于ansys软件平台求解弹性接触问题，获得了榫联接结构接触应力及接触状态量的分布；在已有微动疲劳寿命预测模型的基础上，引入载荷频率影响因子，对低周、高低周复合载荷作用下的燕尾榫联接结构进行了微动疲劳寿命的预测，与试验结果对比表明采用本文提出的方法预测榫联接结构的微动疲劳寿命是有效的。
Being the import unit of the distribution automation system , the transformer terminal unit namely ttu , samples ac input ( such as voltage , current and so on ) and state ( for example : switch state ) and executes remote control command ( open operation or close operation ) , ttu supervise the action of transformer , so it guarantee the security of das ( distribution automation system ) this paper is mainly based on the study of transformer terminal unit based on msp430f449 scm , the work of this paper includes : first , introduces the design of the hardware system and the software system of ttu , the core mathematical principle , and then , discusses the implementation of the communication protocol : iec870 - 5 - 101 and i2 c in detail 配变监测终端ttu ( transformerterminalunit )是配电自动化系统中的重要部分，在系统中完成采集模拟量(电压、电流等)和状态量(如开关状态) ，以及执行遥控(开、合操作)操作等功能，实现对配电变压器的实时监测，保障配电系统的可靠运行。本文主要研究了基于msp430f449单片机的配电监测终端的实现，较详细地介绍了系统的硬件设计、软件设计、核心算法，介绍了通讯规约iec870 - 5 - 101和i ~ 2c的实现。
Being the core unit of the distribution automation system , the feeder terminal unit , namely ftu . samples ac input ( such as voltage , current and so on ) and state ( for example : switch state ) and executes remote control command ( break or close ) . this paper is mainly based on the study of feeder terminal unit based on dsp 馈线自动化终端装置( feederterminalunit )是馈线自动化系统中的核心部分，在系统中完成采集模拟量(电压、电流等)和状态量(如开关状态) ，以及执行遥控(开、合操作)操作等功能。
In the paper , useful attempts and research on adaptive control are developed for a turbofan engine . a model reference adaptive control ( mrac ) using input and output measurements and pi adaptive law are applied to aeroengine multi - variable control system . simulation results show that controller avoids the measurement of full states variables and has good control performance 将利用输入输出测量值的模型参考自适应控制方法和比例?积分型自适应律应用于航空发动机多变量控制中，并进行了数字仿真研究，结果表明控制器有效地避免了全状态量的测量，并获得好的动、静态性能。
