小波去除噪音算法研究

介绍了小波变换滤除噪音的机理和与傅立叶变换相比的优越性,其中包括确定性噪音和随机噪音。讨论了增强去噪效果的几种改进方案并提出一种试验估计去噪方法,对工程应用有一定的实用价值。     

位相物体的三维非对称温度场的重建

采用卷积背抽影公式实现了位相物体的三维非对称温度场的重建,为光线偏／折测量三维非对称温度场提供了高精度分析和处理实验数据的方法。     

一个非常规前体机身的流动显示研究

描述了有类似Ｅｒｉｃｋｓｏｎ前体的非常规机身的初步流动显示研究结果,包括测力、表面油流和激光片光流动显示结果和用层流Ｎ－Ｓ方程进行数值模拟的结果。计算和试验的参数范围：α＝０°～５０°,β＝０°～２０°,虽然计算与试验所用的外形在后部有一些不同,但是两者在涡的位置方面显示了良好的一致性。同时研究也表明,大攻角的流动特性可以通过改变机身前体形状进行控制。通过研究还表明,这类前体在改善大攻角横侧方向安定性方面具有很大的潜力。     

Attitude control system of the first Russian nanosatellite <Emphasis Type="Italic">TNS-0 no. 1</Emphasis>

The results of designing the attitude control system of the first Russian nanosatellite TNS-0 no. 1 providing orientation of its longitudinal axis along the local geomagnetic field induction vector are presented. The system consists of a permanent magnet and two sets of hysteresis rods. The magnetic and geometric parameters of the magnet and rods are calculated. The influence of the permanent magnet field on the hysteresis rods and mutual influence of the rods in the case of compact satellite packaging are analyzed. Examples of calculations of transient processes and steady-state angular satellite motion are presented.     

Method of designing a neural controller for the automatic lateral control of unmanned aerial vehicles

The paper discusses a method of designing the neural controller for two-channel control of a technical object by an example of the roll and yaw control depending on deviations, velocities and accelerations of their variation.     

一种型号专用电源转换器快速检定系统的研制

阐述了依据Q/W 892A-2007《电源转换器检定规程》研制的型号专用电源转换器快速检定系统。通过研制专用拔出力检定装置和多功能智能转换开关,实现由PC机通过系统软件自动控制测试仪器进行检定以及检定结果的处理,并自动生成原始记录和证书报告。系统具有自动、智能等优点,能够实现电源转换器的快速检定。经应用,降低了劳动强度,节省了时间,提高了检定效率。     

LabWindows/CVI环境下调用Word文档的实现方法

目的介绍一种在Labwindows/CVI环境下调用Word的实现方法;方法结合具体的实例,实现对Word文档的调用;结果该方法可以按照规定的格式自动生成Word文档;结论提高了软件的效率和自动化程度。     

Analysis of an arbitrarily loaded shell of revolution based on the finite element method in a mixed formulation

The volume finite element in the form of hexahedron with nodal unknowns as components of the displacement vector and stress tensor has been developed to analyze the shells of revolution. The displacement vector components for the inner point of the finite element and the components of its stress tensor are expressed through the nodal unknowns using the method of vector and tensor fields interpolation by the trilinear shape functions; that provides taking into account the finite element displacement as a whole solid. The variational principle in a mixed formulation is applied to form the matrix of hexahedron deformation. The efficiency of the proposed method for approximating the values being sought as vector and tensor fields in comparison with the traditional method for approximating the values being sought as scalar fields is confirmed by a numerical example.     

某型教练机起落架信号电路改进设计

针对某型教练机存外场使用时出现起落架未放到位，而飞行员却没能及时发现的问题，本文对飞机起落架信号电路进行了分析，并提出了相应的改进措施。     

Approximate technique of tip vortex account in calculating a helicopter main rotor

We present the materials, which substantiate the application of a rather simple approximate method of accounting for disturbances of the airflow around the helicopter main rotor blades; in this case, the disturbances are caused by vortices that come down from the blade ends. It is shown that these disturbances influence significantly the varying blade loads.