新型飞机加温车的设计与研制

本文提出了飞机加温车的原理、方案、设计指标及参数。并对此方案进行了必要的设计验证计算。     

求解C_nH_mO_lN_k-空气系统化学平衡成分的双变量迭代法

燃烧过程和高温气体热力过程的计算需要求解燃气的化学平衡成分。本文提出了一种求解C_(n)H_(m)O_(l)N_(h)-空气系统化学平衡成分的双变量迭代法。与普通的简单迭代法相比,双变量迭代法的收敛性十分可靠;与赫夫法和怀特法相比,双变量迭代法的计算机程序十分简单、计算量极小(所需机时仅为前两者的10％～30％),而收敛性还有所改善。此外,对于贫油混气,文中还提出了双变量同时迭代的计算方案,使计算过程的收敛速度进一步提高。     

防范秘密攻击的安全计算的博弈论实现

在博弈论中,惩罚博弈模拟了参与者试图欺骗但又不想被抓住,即安全计算中秘密攻击者的情形。针对密码学的计算博弈模型,本文对Halpern与Rafael提出的能否在计算具有成本的惩罚博弈与具有一定威慑度的防范秘密攻击的安全计算之间建立联系的问题给出肯定的回答,提出威慑度为1/2的防范秘密攻击的安全是计算博弈中错误可忽略的调解人的通用实现。     

多段翼型气动力优化设计的多标准高效进化算法

本文分别结合基因算法与博弈论中的竞争型Nash对策及分级型Stackelberg对策构造了多标准高效进化算法,并对二维三段翼型成功地进行了多标准位置增升优化。基因算法在合适地选择了基因操作算子后可以得到全局最优解,博弈论的引入使得传统基因算法具备了无人工干预的多标准优化算法,并且这一优化过程接近于实际翼型工程气动力设计情况。应用本文的方法成功地对三段翼型进行了不同气动条件下的缝翼与襟翼的位置组合优化,最后给出了优化算例,并对两种算法进行了对比。     

Formation flying for magnetic sails around artificial equilibrium points

This paper investigates the problem of magnetic sail-based spacecraft formation control around the artificial equilibrium points (AEPs), which can eliminate the requirement of the propellant. The thrusts are achieved by utilizing the interaction between the solar wind and the artificial magnetosphere generated by superconducting current coil onboard. The circular restricted three-body problem (CRTBP) of magnetic sail is discussed including the allowed regions and linear stability of AEPs, the locations of collinear AEPs and the possibility of existence of periodic orbits around the collinear AEPs. Next, the dynamical models of magnetic sail formation around the collinear AEPs are established. A novel fast fixed-time nonsingular terminal sliding mode controller (FFNTSM) based on fixed-time disturbance observer (FTDO) is developed to account for external disturbances. Several numerical simulations are conducted to substantiate that spacecraft formation can be precisely controlled by the proposed propellantless propulsion method in the presence of external disturbances.     

Boundary of nighttime ozone chemical equilibrium in the mesopause region: Improved criterion of determining the boundary from satellite data

A modified derivation of the criterion of nighttime ozone chemical equilibrium (NOCE) in the mesopause region is presented. According to 3D model calculations, the improved criterion reproduces the lower boundary of the equilibrium much better than its earlier version. Processing of the SABER/TIMED data of 2021 has shown that the modified criterion elevates the NOCE boundary by ～ 0.1–1.7 km, depending on latitude and season. The proposed method of determining the condition of chemical equilibrium can be used to analyse the equilibrium of many trace gases in the stratosphere and troposphere important for different practical applications.