飞机制造工艺信息系统关键技术研究与实现

研究了飞机制造工艺信息系统的关键技术,包括基于架次的以工艺组件为核心的MBOM管理、AO/FO动态图形工艺设计界面的实现、以AO为核心的飞机装配工艺规划、基于FO的飞机零件制造管理.飞机制造工艺信息系统已在生产中实际应用.     

采用新技术的维修信息系统设计

阐述了一种现代航空装备维修信息系统的设计方法.该信息系统利用维修专家系统、故障诊断、维修决策和维修支援等新技术,大大提高了航空装备维修的自动化水平.     

三维修形对薄轮缘斜齿轮共振应力影响的实验研究

以８对具有不同辐板布置薄轮缘斜齿轮传动为对象，通过实验研究了三维修形对斜齿轮共振应力的影响。运用建立在有限元法、柔度矩阵和数学规划法基础上的三维修形方法获得了每对齿轮副的修形曲线。结果表明，采用三维修形技术将显著降低薄轮缘斜齿轮中的应力波动和振动水平，有利于延长齿轮传动的工作寿命。     

电磁干扰自动测量系统

电磁干扰自动测量系统可完成产品诊断测量、环境场测量和基于GJB-151/152标准的有关测量。测量频率范围为14kHz～18GHz,幅度测量精度在30MHz频率以下优于±2.85dB。在30MHz～6GHz范围内优于±3.86dB,在6～16GHz频率范围内优于±4.81dB,在16～18GHz范围内优于±5.06dB。     

Design and application of an air-cooled probe for total pressure measurement at combustor outlet

An air-cooled probe was designed for measurement of total pressure at combustor outlet; its cooling scheme combined the film cooling and convection cooling. With the aid of CFD technique, cooling effectiveness of the coolant jets at various blow ratios was compared; suitable blow ratios and configuration of film holes were chosen accordingly. The overall cooling performance of the probe was evaluated via CFD technique, the design was improved according to the simulation result, and the cooling effect of the leading edge was obviously strengthened by increasing the local coolant mass flow rate. The results of wind tunnel test indicated that, between Mach numbers 0.2 and 0.4, the probe achieved a high accuracy at various attack angles. The probe was utilized in an annular combustor rig test, the highest temperature reached 1760K and total pressure reaches 1036kPa. The result of rig test demonstrates that the coolant film distribution consistent appropriately with the CFD results.      

A self-healing strategy with fault-cell reutilization of bio-inspired hardware

The self-healing strategy is a key component in designing the bio-inspired embryonics circuit with the structure of cell arrays. However, the existing self-healing strategies of embryonics circuits mainly focus on permanent faults inside the modules of cells such as the function module and the configuration register, while little attention is paid to transient faults. From the point of view of obtaining high efficiency of hardware utilization, it would be a huge waste of hardware resources by permanent elimination when a cell only suffers a transient fault which can be repaired by a configuration mechanism. A new self-healing strategy, the Fault-Cell Reutilization Self-healing Strategy(FCRSS) which presents a method for reusing transient fault cells, is proposed in this paper. The circuit structures of all the modules in the cells are described in detail. In the new strategy, two processes of elimination and reconfiguration are combined. Within the process of fault-cell elimination, cells with transient faults in the embryonics circuit array could be reused simultaneously to replace the functions of the cells on their left side in the same row. Therefore, transient fault-cells in a transparent state can be reconfigured to realize the fault-cell reutilization. Finally,a circuit simulation, resource consumption, a reliability analysis and a detailed normalization analysis are presented. The FCRSS can improve the hardware utilization rate and system reliability at the expense of a small amount of hardware resources and reconfiguration time. Following the conclusion, the method of determining the optimal self-healing strategy is presented according to the environmental conditions.     

可靠性分析的三参数法

提出了可靠性分析的三参数法,它不仅考虑了随机变量的均值和方差,还计入分布偏度的影响。由于三参数法较多地保留了随机变量的分布特征,从而提高了可靠性分析的精度。这一点对于有高可靠性要求的航空产品的可靠性分析更具有意义。     

红外笼模拟外热流方法对空间相机温度的影响分析

空间相机的热平衡试验中,一般采用红外笼—热流计的闭环控制系统来模拟相机进光口处的外热流。为研究该种热流模拟方法对相机温度场的影响,建立了简化的模型进行分析。分析结果表明,红外热流模拟对相机温度场的影响体现在相机整体温度水平和光学件温度均匀性两个方面。对于有精密控温要求的空间相机来说,这一影响产生的误差是必须考虑的。     

改进的量测噪声自适应滤波在空间非合作目标视觉导航中的应用

针对空间非合作目标对接过程中特征点识别的非高斯测量噪声与幅值不确定,对传统滤波方法的量测更新部分进行改进.通过量测更新后的新息数据对量测噪声量级进行在线二次估计,使得量测噪声估计值更贴近实际,增进滤波效果.设计了针对空间非合作目标对接段的滤波器,能够提供对接段相对位置、速度、姿态角及角速率估计信息.仿真结果表明所提出的...     

胶-螺混合连接结构强度分析及影响因素研究

为深入分析胶-螺混合连接结构强度及影响因素,利用ABAQUS平台建立胶-螺混合连接三维渐进损伤模型,采用界面层损伤判据及退化方法来模拟胶层的损伤破坏。首先,将胶-螺混合连接结构强度分别与胶接结构、螺接结构强度进行对比,详细阐释胶-螺混合连接结构与胶接结构承载机理及胶接区应力分布形式;然后,分析讨论钉头形式及宽径比对混合连接结构强度和损伤形式的影响。结果表明：胶-螺混合连接结构强度优于胶接结构和螺接结构,并得到了可有效提高结构强度的钉头形式及最佳宽径比。