用神经网络法编程加工轮毂上特殊曲面的探讨

根据轮毂上曲面的特殊性,提出了采用神经网络方法进行编程,实现数控加工,以取代传统的加工方法的设想。     

逆升压电子设备冷却系统控制方案的研究

分析了目前国内一些飞机基于三点温度控制方案的逆升压电子设备冷却系统的缺陷 ,提出了一种新的系统控制方案 ,即基于飞行速度和高度的逆升压电子设备冷却系统的控制方案。这一方案不需要人工干预 ,可实现全自动化。     

Investigations into sensing characteristics of circular thin-plate electrostatic sensors for gas path monitoring

Circular thin-plate electrostatic sensors are promising in gas path monitoring due to their advantages of non-intrusiveness and easy installation. The spatial sensitivity and filtering effect are two important performance parameters. In this paper, an analytically mathematical model of induced charge on a circular thin-plate electrode is first derived. Then the spatial sensitivity and filtering effect of the circular electrostatic sensor are investigated by numerical calculations. Finally,experimental studies are performed to testify the theoretical results. Both theoretical and experimental results demonstrate that circular thin-plate electrostatic sensors act as a low-pass filter in the spatial frequency domain, and both the spatial filtering effect and the temporal frequency response characteristics depend strongly on the spatial position and velocity of the charged particle. These conclusions can provide guidelines for the optimal design of circular thin-plate electrostatic sensors.     

小鹰-500飞机疲劳试验载荷谱的编制方法

针对小鹰500飞机的设计和使用特点，选用了FAA推荐的通用飞机实测载荷谱数据，按照民机的TWIST编谱原则编制出用重心过载表示的“飞-续-飞”随机疲劳试验载荷谱，用于小鹰-500飞机机翼疲劳试验，并参照国外文献中有关尾翼载荷谱的保守处理方法，采用了从重心载荷谱计算出配套平衡的平尾机动载荷，将其幅值放大1.2倍和频次放大3倍的做法，编制出了平尾疲劳试验载荷谱。     

水平导航中转弯航线解算方法的研究和仿真

在飞机显示器的水平导航区域上需要为飞行员实时显示最新的航线信息,航线中的每个航路点均有不同的转弯方式,目前国内正在研发的飞机采用旁切转弯和飞越转弯两种方式,若错过了预计的转弯起始点,则需要重新进行航线解算,这被定义为超调转弯,给出三类转弯航线的解算方法。     

Two-Way-Coupling Method for Rapid Aerothermoelastic Analyses of Hypersonic Wings

Several types of coupling methods for resolving aerothermoelastic problems associated with hypersonic wings are summarized,and the appropriate coupling methods for engineering calculations are selected.Then,the calculation and analysis methods for the subdisciplines in this field are introduced,and the time step issue is discussed.A two-way-coupling rapid static aerothermoelastic method for analyzing hypersonic wings is proposed.This method considers thermal effects and is used to conduct an aerothermoelastic response analysis for a hypersonic wing.In addition,the aerodynamic force,heat flux,structural deformation and temperature field are obtained.The following three conclusions are drawn.First,the heating effect has a significant impact on the static aeroelastic response of hypersonic wings;therefore,thermal protection shields are essential.Second,the application of thermal protection shields reduces the differences in the calculation results between the one-and two-way-coupling methods.Third,hypersonic wings exhibit large thermal deformation under high-temperature environments,and in certain cases,the thermal deformation is even larger than the deformation caused by aerodynamic force.     

BTi6431S钛合金盒形件热拉深成形工艺数值模拟

为研究BTi6431S钛合金热拉深成形工艺,本文以某型号飞行器天线盒盖为例,通过设计正交实验方案,先后分别对无压边情况下拉深成形进行了有限元数值模拟,用最薄壁厚减薄率作为描述零件成形结果的评价标准,得出该钛合金件在成形温度为650°C,首次拉深凹模圆角半径11mm、凸模圆角半径7mm、转角半径12mm、拉深高度25mm参数下,最薄壁厚减薄率最小(20.3%)。     

地外二氧化碳转化利用技术研究现状与展望

为有效解决未来长期载人地外生存面临的物资供给等关键问题,获得更高的氧回收率、能量转化效率和更低的应用成本,亟须发展更高效的地外二氧化碳转化利用技术。文章总结了地外二氧化碳利用的发展现状并分析了近期的研究进展,发现不同技术之间差异大,在航天应用过程中,需充分考虑地外环境限制因素,以选用更合适的技术。空间站上已搭载的Sabatier装置和火星车上的MOXIE装置初步实现了地外二氧化碳还原。以“地外人工光合成”为代表的常温二氧化碳转化技术可为地外环控生保提供新路线。其不仅能够实现地外氧气供给,还可获得甲酸、乙烯和甲烷等有机分子作为燃料或生物转化原料。随着相关基础研究的不断发展,有望实现二氧化碳的高效转化和高附加值有机物、甚至碳糖食物的生产。地外二氧化碳转化利用技术的发展,将实现地外密闭环境下的废弃资源利用与物质循环,降低载人空间站、载人深空飞船的物资供应需求,也将为原位资源利用火星大气中的二氧化碳提供创新思路,以支撑未来可承受、可持续的地外生存任务。