型号标准化文件体系的建立与管理

概述型号标准化文件体系的内涵、特点、作用以及文件体系的组成,阐明型号标准化文件体系与企业标准体系以及型号文件系统的关系.介绍型号标准化文件体系的运行与管理.     

New Neural Network Response Surface Methods for Reliability Analysis

This article presents two new kinds of artificial neural network (ANN) response surface methods (RSMs): the ANN RSM based on early stopping technique (ANNRSM-1), and the ANN RSM based on regularization theory (ANNRSM-2). The following improvements are made to the conventional ANN RSM (ANNRSM-0): 1) by monitoring the validation error during the training process, ANNRSM-1 determines the early stopping point and the training stopping point, and the weight vector at the early stopping point, which corresponds to the ANN model with the optimal generalization, is finally returned as the training result; 2) according to the regularization theory, ANNRSM-2 modifies the conventional training performance function by adding to it the sum of squares of the network weights, so the network weights are forced to have smaller values while the training error decreases. Tests show that the performance of ANN RSM becomes much better due to the above-mentioned improvements: first, ANNRSM-1 and ANNRSM-2 approximate to the limit state function (LSF) more accurately than ANNRSM-0; second, the estimated failure probabilities given by ANNRSM-1 and ANNRSM-2 have smaller errors than that obtained by ANNRSM-0; third, compared with ANNRSM-0, ANNRSM-1 and ANNRSM-2 require much fewer data samples to achieve stable failure probability results.     

泄爆面积对连通容器预混气体泄爆影响的实验研究

在大小两个体积不等的球形容器和圆形管道组成的连通容器中,开展连通容器泄爆实验,研究连通容器等泄爆面积条件下的火焰传播和压力变化情况。结果表明：火焰从起爆容器加速传播到传爆容器,但由于容器的开口泄爆,火焰传播速率小于密闭爆炸的火焰传播速率;随泄爆面积的减小,连通容器的泄爆压力和压力上升速率均增加;连通容器爆炸受管道火焰加速和压力累积作用,在相同泄爆面积条件下,容器的最大泄爆压力和最大压力上升速率高于单个容器爆炸时的最大泄爆压力和最大压力上升速率,特别是当小容器为传爆容器时,差别更加明显,不能用单个容器的泄爆设计方法来指导连通容器的泄爆。     

增量成形研究进展

重点综述了新型增量成形技术中的4类典型成形工艺,即局部不均匀加载下板面内弯曲增量成形、单点增量成形、多点柔模成形、高速冷滚打成形就其成形原理、工艺、设备及研究现状等方面的研究成果,并提出了这类新型增量成形的研究方向.     

K418合金的组织对低周疲劳性能的影响

研究了Ｋ４１８合金不同宏观组织（晶粒度）对低周疲劳性能的影响，同时研究了不同热处理状态下合金组织中的γ’相及其对合金的低周疲劳性能的影响。     

一种新的最优地形跟踪随轨迹算法

考虑地形因素和故方威胁的潜在影响，研究了在安全保障前提下，飞行时间－地形庶蔽程度综合最优的地形跟随飞行轨迹问题，提出一种新的最优地形跟随飞行轨迹的算法。首先定义了最小危险曲面，通过坐标变换将飞行器的运动方程变换到该曲面上；再运用极小值原理，求出满足飞行时间－地形遮蔽最优的轨迹的微分方程组；最后用一维搜索算法，通过寻求微分方程的初值解出了最优轨迹。仿真结果表明该算法所产生的三维轨迹光滑连续。不仅能紧     

Resonantly Excited Non-linear Density Waves in Disk Systems

Most of the disk systems are characterized by spiral structures. A good portion of these spiral structures can be identified as waves resonantly excited by a perturber in or pertaining to the same system. For planetary rings, this is an exterior satellite; for galactic disks, a rotating bar; for proto-stellar disks (yet to be confirmed), this would be a proto-planet. These waves, not just responsible for the present morphology of the disks, also play a dominating role on evolution of the disks. Resonance excitation is a extremely effective mechanism. A relatively weak perturbation can result in a highly non-linear responses in the disk. Therefore, non-linear theory is a necessity here. We will examine the non-linear theory of resonance excitation and discuss the applications of the theory to Saturn's rings and disk galaxies in this paper.     

真空等离子装置的改进设计

利用旧的真空装置改造成一个物理气相沉积设备，不仅节约了大量的资金，而且还为今后的科研工作开辟了一个崭新的领域。本文主要讨论了在改造过程中，根据物理气相沉积的共性以及本实验装置的特定要求和需要注意的几个问题，如一个真空沉积腔的整体结构、密封性和冷却结构，如何有效地利用载物台、励磁电路和点火电路的设计等，提出了改造方案。目前，已成功地将它改造成真空度为１０－ ２τ的低真空等离子沉积装置。     

浅谈在雷达管制条件下如何控制好进港航班的高度下降

在雷达管制条件下,随着飞行流量的逐年增加,要求管制员对航空器的调配精度也越来越高,使得管制员对航空器航行诸元的控制也逐渐由少到多,由粗到细。这种要求的转变在区域管制室由程序管制向雷达(监控)管制的过渡过程中显得尤为明显。过去那种简单、粗糙的以阶梯上升/下降为主的     

热和振动复合环境中人体热调节的数值模拟

本文针对热和振动复合环境对人体的影响特点，建立了该复合环境中二维人体热调节系统的数学模型．采用数值方法对人体热调节系统数学模型进行求解，计算了不同热和振动复合环境条件下人体温度分布及动态响应，计算结果与实验结果相符较好，相对误差小于５％．