FET振荡器注入锁相伏特拉级数分析

应用伏特拉级数法分析了电容耦合ＦＥＴ振荡系统在外加信号下的注入锁定现象，推导出输出信号和注入锁定带宽表达式。与一般非线性系统分析方法相比，伏特拉级数法在建立好系统模型后只需进行代数运算，从而避开了求解非线性，非齐次高阶微分方程的复杂过程。     

准各向同性基层上椭圆形子层的屈曲

通过改进文献[1]中假设的挠度函数,使Rayleigh-Ritz法能用于计算准各向同性基层上任意对称椭圆形子层的临界应变,然后以单向层板为主,探讨了临界应变随基层泊桑比ν,椭圆半轴之比λ,子层角θ和单层铺设角α的变化规律。     

Experimental study of damping properties of a composite torsion bar in the helicopter main rotor hingeless hub

The results of the experimental studies of damping characteristics of a composite torsion bar in the helicopter main rotor hingeless hub are presented. A variant of their improvement is considered.     

航空工业发展中存在的问题与对策——以河南省为例

重视发展战略、重视国内市场、重视技术创新以及重视对外合作是航空工业发达国家发展航空工业的主要经验.我国航空工业目前存在着企业规模小、布局分散、"软实力"不足、产品多属民品、科研体制存在弊端等问题.加速我国航空工业的发展,需要制定长远的发展规划,以市场为导向,加大结构调整力度,进行一系列的体制机制创新以及重视现有航空产品的改进改型,广泛进行国际国内合作,等等.     

The finite element analysis of shells of revolution with a branching meridian

We present an algorithm for calculating the shells of revolution with the branching meridian using the triangular finite elements, the rigidity matrices of which are formed based on the vector method of displacement interpolation [1]. The correct kinematic and static conditions of shell conjugation on the line of their coupling have been developed. The shell structure consisting of a cylinder and adjacent shells is calculated under various conditions of support.     

基于ADAMS/Aircraft的起落架滑跑模型仿真

以小车式起落架为例,利用ADAMS/Airc- raft建立了起落架滑跑试验仿真模型.给出了起落架滑跑运动方程,并进行了滑跑试验仿真分析。仿真结果与理论要求对比具有较好的一致性。     

减压活门性能试验台系统方案设计

主要介绍了减压活门性能试验台的实现机理、采用的方案。     

新型精密狭缝的设计

介绍了一种基于弹性铰链的精密狭缝的设计，加工工艺要求和性能测试结果。根据实际需要，狭缝可以采用水冷结构。     

Application of Gram-Schmidt algorithm to fully adaptive arrays

The Gram-Schmidt orthogonalization (GSO) algorithm has excellent numerical performance and is readily applicable to systolic implementations such as in a field of adaptive cancellation systems. A modified GSO algorithm for a fully adaptive array is proposed and computer simulations show that the proposed algorithm gives superior performance. A systolic implementation of the proposed GSO algorithm for fully adaptive array is presented. A feedback mode GSO algorithm for use with analog weights is also presented and has been shown to have excellent performance in the presence of weight errors