大尺寸蜗轮齿距累积误差的检测及数据处理

介绍了１种作为工厂机床检修中大尺寸蜗轮距累积误差的检测装置和检测方法，以及用计算机快速准确地进行数据处理。     

平面直线平行度误差的解析评定法与微机数据处理

本文建立了平面直线平行度误差的三种不同评定方法的数学模型。依据该数学模型,利用微型电子计算机处理数据,具有速度快、精度高的特点。     

遥感图像数据压缩新技术研究

研究了遥感图像数据压缩新技术。利用半正交小波基和对偶系设计了具有严格线性相位和精确重建特性的ＦＩＲ滤波器组，将其应用于遥感图像的数据压缩，取得了良好的成果。     

主导概率数据关联及算法

本文给出主导概率数据关联（ＤＰＤＡ）及算法，定义主导联合事件和主导概率，考虑实际目标环境可行联合事件出现为非等概率，导出主导概率数据关联计算方法，它无需计算所有行联合事件的联合率，从而克服了联合概率数据关联（ＪＰＤＡ）的组合问题，本文证明了ＤＰＤＡ性能上限不低于ＪＰＤＡ，下限低于ＰＤＡ，而下限出现的概率极小。本文给出了ＭｏｎｔｅＣａｒｌｏ仿真表明ＤＰＤＡ算法具有很好的性能和较高的实用价值。     

三坐标测量机的现状、发展与未来

叙述了三坐标测量机的基本构成、国内外上产现状、发展与未来。包括测量机的准确度、分类及丰富的软件。尤其对测量机的发展作了较详细的介绍。最后，预测厂测量机的未来。     

Analysis of solar spike events by means of symbolic dynamics methods

We have searched for interrelations of spikes emitted simultaneously at different frequencies during the impulsive phase of flare events (Fig.1). As the spikes are related to the flare energy release and are interpreted as emissions that originate at different sites having different magnetic field strengths, any relation in frequency is interpretated as a relation in space. Quantities of symbolic dynamics, such as mutual information, Shannon information and algorithmic complexity are appropriate to characterize such spatiotemporal patterns, whereas the popular estimate of fractal dimensions can be applied to low-dimensional systems only.The goal is to decide between two possible types of fragmentation depending on the energy release and emission processes, which we callglobal andlocal organization. In the global organization the whole region becomes supercritical, and the energy is released in independent, small regions. The alternative local scenario requires a trigger that spreads from initial localized events and ignites nearby regions.Mutual information which is a generalization of correlation indicates a relation in frequency beyond the bandwidth of individual spikes. The scans in the spectrograms with large mutual information also show a low level of Shannon information and algorithmic complexity, indicating that the simultaneous appearance of spikes at other frequencies is not a completely stochastic phenomenon (white noise). It may be caused by a nonlinear deterministic system or by a Markov process. By means of mutual information we find a memory over frequency intervals up to 60 MHz (Fig. 2). Shannon information and algorithmic complexity, however, describe spike events as a whole, i.e. a global source region. A global organization is also apparent in quasi-periodic changes of the Shannon information and algorithmic complexity in the range of 2–8 seconds (Fig. 3).This findings is compatible with a scenario of local organization in which the information of one spike event spreads spatially and hence triggers further spike events at different places. The region is not an ensemble of independently flashing sources, each representing a system that cascades in energy after an initial trigger. On the contrary, there is a causal connection between the sources at any time.The analysis of four spike events suggests that the simultaneous appearance of spikes is not stochastically independent but a process in which spikes at nearby locations are simultaneously triggered by a common exciter.We have shown in the case in the case of spikes that quantities from nonlinear dynamics used in this paper are helpful in detecting structural properties of complex spatio-temporal patterns. This approach seems to be promising also for several other astrophysical applications.     

细长旋成体大迎角绕流非定常特性的实验研究

在亚临界流动范围内,通过细长旋成体在无侧滑状态下的脉动压力测量,对大迎角细长旋成体多涡区域的轴向以及周向的压力脉动特性进行了研究,分析了旋成体周向压力脉动幅度及主频与背涡之间的对应关系,发现在多涡区存在一种完全不同于卡门涡脱落时的非定常现象,得到压力脉动主频的斯特劳哈数沿旋成体轴向有逐渐增大的趋势。     

航天器火工冲击环境数据外推技术研究

为了制定可靠的组件冲击试验条件,需要预示航天器火工冲击环境.在分析了航天器火工冲击环境预示的三类方法,包括试验法、数值分析法和数据外推法的基础上,详细总结和分析了数据外推法的国内外研究进展,并通过理论推导提出了新的数据外推公式;以大量火工冲击测量数据为参照,通过对比分析证明该数据外推公式比NASA和ESA的数据外推公式...     

基于P～t曲线的导弹火工品品质测试

为了提高导弹火工品的存贮安全性和使用可靠性 ,提出了一种基于P～t(压力 -时间 )曲线获取的火工品品质测试分析方案 ;利用凌华高性能数据采集卡PCI- 9112采集爆炸过程的瞬态压力信号 ,并在对采集到的信号进行频谱分析和在滤波的基础上提取出了火工品的特征参数 ,从而为火工品的品质评判提供了决策参考。     

基于局部平稳AR模型的信号结构变化点精确估计方法

研究了局部平稳AR模型,提出了基于递归辅助变量（RIV）双格型滤波算法,通过统计分析信息量AIC的变化精确估计信号结构变化点。对遥测速变参数的分析表明,该方法能够精确定位信号结构的变化点,实现局部平稳信号的精确分割。