一种增强虚拟仪器软件数据共享性的方法

在介绍虚拟仪器及其开发环境LabVIEW的特点的基础上，分析了LabVIEW与外部程序代码接口的途径，并着重实现了将LabVIEW与外部代码进行连接的高级技术之一——动态链接库机制。实践表明，此机制高效、易行，是增强LabVIEW与其它Windows应用程序之间数据共享能力的一条很好的途径。     

Formation of required transfer zero location in the multiconnected dynamic system

A method for providing the required location of a transfer zero set in the linear multiconnected dynamic system with an equal number of inputs and outputs is considered.     

涡喷发动机H_∞控制参数化Ricati方程的解

由分块矩阵的奇异值不等式关系，给出了初猜值γ０、λ０的对半求解法，在此基础上直接给出带参数的Ｒｉｃｃａｔｉ方程迭代求解法。用此方法对涡喷发动机不确定性系统设计了控制器，并在发动机气动热力学非线性模型上进行了仿真验证，结果表明控制系统能够取得满意的鲁棒性能、抗干扰性能和伺服跟踪性能。     

基于3层结构的新一代航管信息系统的设计与实现

采用3层结构理论对新一代航管信息系统进行了设计,并对系统研制中的关键技术,包括3层结构的物理实现、基于部件的应用开发、OLE、WindowsSocket、数据实时同步和访问控制等的实现方法进行了分析研究,最后给出了系统的应用实例。     

Experimental study of strain for plates discretely connected to a cylindrical shell

We present the results of an experimental study of deflections for the loaded plates that are discretely connected to a circular cylindrical shell along the generatrix lines. The influence of structure element connection elasticity on these deflections has been examined. The unique experimental setup and three specimens being tested are described. Satisfactory agreement is shown between the experimental results and the calculation data obtained by the simplified mechanical model of a plane problem.     

Control of spacecraft turns in scheduled time using rocket engines

We obtained an on-off control law for two spacecraft (SC) rocket engines creating the angular acceleration in the opposite directions considering that SC is controlled by the rocket engines with an exponential increase of thrust at starting and decrease at shutdown. This control law provides the change-over of SC from the initial angular position to the final one in the scheduled time. A special trajectory consisting of eight typical segments is proposed to identify the angular acceleration and delay of its formation in the rocket engines. Both problems are solved by the method of analytical construction of composite trajectories for the angular turn from the typical segments on which the differential equations of angular motion have analytical solutions. The results are applicable for the development of promising space interceptors and design of onboard control systems.     

Divergence of a plate discretely supported by the stringer system

An approximate solution of the divergence problem, that is, of the static instability of a plate discretely supported by a system of stiffening ribs (stringers) in the gas flow. The critical velocity of divergence is determined in one-term approximation and the influence of stringers on it is analyzed.     

Construction of an airfoil with an irregularity in the flow

Using the method of quasisolutions for inverse boundary-value problems of aerohydrodynamics, a problem of constructing an airfoil was solved by the specified velocity distribution along the sought airfoil contour when there is an irregularity in the flow such as a vorticity source. The cases of a source (sink) and vortex are obtained as particular ones. The airfoils are constructed numerically and analytically and conclusions are made about an influence of the irregularity position and type on the shape and aerodynamic characteristics of the airfoil.     

Analysis of chaotic vibrations for the distributed systems in the form of the Bernoulli-Euler beams using the wavelet transform

A problem on chaotic vibrations of the Bernoulli-Euler beams is formulated. The wavelet transform was first applied to investigate the complex beam vibrations. The validity of results was provided by using two methods of solution, namely, the finite element method and finite difference method.