Safety Analysis of Helicopter Autorotation Landing Execution on Conditions of Providing Skid Landing Gear Static Strength

The requirements for skid landing gear static strength ensuring are examined based on the comparative analysis of the Airworthiness Standards requirements. Probabilistic principle of determining the safety factor of the skid landing gear is presented. The analysis of the experimental data on bench and flight tests is performed for calculating the actual value of this factor.     

Nonlinear deforming of laminated composite shells of revolution under finite deflections and normal’s rotation angles

The discretization of the boundary value problem for laminated composite shells is based on the finite difference approach using the regular mesh with the constant grid step and the difference operators of the second order of accuracy. The dynamic relaxation method is proposed for the solution of the nonlinear problem. The evolutionary equations of the dynamic relaxation are constructed, and the optimum parameters of the converging linear iterative process are estimated.     

圆柱度仪系统误差的验证分析及消除

介绍了在使用MMQ400圆柱度仪测量高精度圆柱度时,通过对不同测量方法的测量数据差异对比及分析,验证测量系统误差对测量的影响,并提出消除系统误差的方法.     

Laminar flow control research at TsAGI: Past and present

This paper presents a brief review of activities in laminar flow control being performed at the Central Aerohydrodynamic Institute named after Prof. N.E. Zhukovsky (TsAGI). These efforts are focused on the improvement of the existing laminar flow control methods and on the development of new ones. The investigations have demonstrated the effectiveness of aircraft surface laminarization applications with the aim of friction drag reduction. The opportunity of considerable delaying of laminar-turbulent transition due to special wing profile geometry and using boundary layer suction and surface cooling has been verified at sub- and supersonic speeds through various wind tunnel testing at TsAGI and during flying laboratory experiments at the Flight Research Institute (LII). The investigations on using hybrid laminar flow control systems for friction drag reduction were also carried out. New techniques of laminar flow control were proposed, in particular, the method of local heating of the wing leading edge, boundary layer laminarization by means of receptivity control, and electrohydrodynamic methods of boundary layer stability control.     

Avoid online radiation risk: Theoretical simulation of chromosome breaks in cells exposed to heavy ions

In this study, we report an easy and quick method on simulating chromosome breaks in cells exposed to heavy charged particles. The theoretical value of chromosome break was calculated, and validated comparison with experimental value by using premature chromosome condensation technique. A good consistency was found between theoretical and experimental value. This suggested that higher relative biological effectiveness of heavy ions was closely correlated with its physical characteristics. Also, a safe approach on predicting chromosome breaks in cells exposed to heavy ions at off-line environment can be considered. Furthermore, three key factors influencing the theoretical simulation was investigated and discussed.     

Analytical construction of interception trajectories in atmosphere

For an interception strategy of a removable target by a return space vehicle (RSV), we propose a structure of the control law by the aerodynamic efficiency that determines a chain of the three standard trajectories: nosing-up–free flight–nosing-down. A solution of the terminal problem is to determine numerical values of the control parameters that define moments to switch the RSV flight from one standard trajectory to another.     

EPDM包覆层热解状态下的力学行为及本构模型

为了准确描述固体火箭发动机三元乙丙(EPDM)包覆层在不同热解状态下的力学特性,通过热重分析的方法得到EPDM的热解温度范围,并采用准静态单轴拉伸实验的方法获得EPDM在不同热解温度下的应力-应变曲线。以Ogden(n=2)模型为基础,分别对不同热解状态下的力学曲线进行建模,并通过对实验数据的拟合获得模型参数。结果表明,在初始热解状态下,材料只发生了少量的失水和气体的逃逸,其力学行为可通过粘超弹本构模型进行描述;随着材料热解程度增加,基体材料和填充纤维均遭到破坏,其力学行为表现为超弹脆性材料特性。     

Systems for the indication and display of secondary information in avionics and autobasing complexes

We consider the peculiarities of application for the cabin indicating systems of secondary information display, formulate and systematize the compositional and technical requirements for display systems and their elements. The tendencies and lines in the development of head-up displays for avionics and autobasing complexes were determined. The technique of calculating optics of such display systems with the use of electronic distortion compensation is presented.     

冯子明 航空信息化专家

我国航空企业数字化制造已经有哪些成就,为我国航空企业带来怎样的影响?冯子明:目前国内飞机数字化设计制造水平在不断地提高。数字化的软硬件环境已初具规模,飞机设计已由三维几何模型设计向全信息三维模型设计方向发展     

高级教练机训练模拟器发展趋势分析

现代飞行员培训普遍采用综合训练系统(TTS),训练模拟器是其中的重要组成部分。如何使训练模拟器能够快速、有效地培训飞行员,且具有一定的可持续发展能力,已成为训练模拟器的发展必需解决的问题。本文通过总结国内外训练模拟器的发展情况及分析高级教练机训练模拟器的特点,提出了高级教练机训练模拟器发展的相关建议和思路。