利用格壁安装角对栅格舵展开折叠压心控制的工程方法研究探索

随着技术的发展，在工程设计中，对于巡航迎角下栅格舵导弹的展开与折叠的压心变化控制对于控制系统来说尤为重要。本文创新性的首次提出利用栅格舵的内壁单元的偏转，即相对于水平面的夹角来实现在设计点下的压心控制。由于设计过程需要多次迭代，本文利用计算在所关注的设计点处对展开折叠压心进行了验证，创造性的利用了等效代替的方法提出了一种新型的计算折叠状态压心的快速工程方法。     

Single track and single layer formation in selective laser melting of niobium solid solution alloy

Selective laser melting (SLM) was employed to fabricate Nb-37Ti-13Cr-2Al-1Si (at%) alloy, using pre-alloyed powders prepared by plasma rotating electrode processing (PREP). A series of single tracks and single layers under different processing parameters was manufactured to evaluate the processing feasibility by SLM, including laser power, scanning speed, and hatch distance. Results showed that continuous single tracks could be fabricated using proper laser powers and scanning velocities. Both the width of a single track and its penetration depth into a substrate increased with an increase of the linear laser beam energy density (LED), i.e., an increase of the laser power and a decrease of the scanning speed. Nb, Ti, Si, Cr, and Al elements distributed heterogeneously over the melt pool in the form of swirl-like patterns. An excess of the hatch distance was not able to interconnect neighboring tracks. Under improper processing parameters, a balling phenomenon occurred, but could be eliminated with an increased LED. This work testified the SLM-processing feasibility of Nb-based alloy and promoted the application of SLM to the manufacture of niobium-based alloys.     

Noise analysis of continuous GPS coordinate time series for CMONOC

The Crustal Movement Observation Network of China (CMONOC) is one of the major scientific infrastructures, mainly using Global Positioning System (GPS) measurements, to monitor crustal deformation in the Chinese mainland. In this paper, decade-long coordinate time series of 26 continuous GPS sites of CMONOC are analyzed for their noise content using maximum likelihood estimation (MLE). We study the noise properties of continuous GPS time series of CMONOC for the unfiltered, filtered solutions and also the common mode signals in terms of power law plus white noise model. In the spatial filtering, we remove for every time series a common mode error that was estimated from a modified stacking of position residuals from other sites within ∼1000 km of the selected site. We find that the common mode signal in our network has a combination of spatially correlated flicker noise and a common white noise with large spatial extent. We demonstrate that for the unfiltered solutions of CMONOC continuous GPS sites the main colored noise is a flicker process, with a mean spectral index of ∼1. For the filtered solutions, the main colored noise is a general power law process, indicating that a major number of the filtered regional solutions have a combination of noise sources or local effects. The velocity uncertainties from CMONOC continuous GPS coordinate time series may be underestimated by factors of 8–16 if a pure white noise model is assumed. In addition, using a white plus flicker noise model, the median values of velocity errors for the unfiltered solutions are 0.16 (north), 0.17 (east) and 0.58 (vertical) mm/yr, and the median values for the filtered solutions are 0.09 (north), 0.10 (east) and 0.40 (vertical) mm/yr.     

复合材料缠绕气瓶可靠性验证技术

根据航天器用复合材料气瓶高可靠性特点,对复合材料气瓶的可靠性进行了分析,气瓶的失效模式主要为泄漏和爆破,影响因素分别为疲劳寿命和承压能力,其中疲劳寿命主要受内衬影响,而承压能力主要由复合层性能决定。最后对气瓶的可靠性试验进行了描述,举例说明了气瓶的可靠度试验验证方法。     

一种用于液晶曝光中的激光检测系统

介绍了一种非接触式激光检测系统，可用于检测液晶曝光中液晶模板与基板之间的间隙，给出了该种系统的测量原理、硬件系统、信号处理方法、测量结果、分辨力和误差分析，并指出了这种测量系统的应用。     

弹地人在回路末制导时延补偿改进模型

基于弹地通信链路的人在回路制导导弹利用惯性导航系统短时导航精度高的特点,对导弹末制导中导引指令的时间延迟提出了两种补偿模型及改进方法。通过Simulink仿真,得出距离和导引量与目标横向误差的关系及其方法改进后精度的提高幅度,并进行了分析。仿真结果验证了该方法的有效性。     

基于统计原理的板边弯矩计算方法

板边弯矩的计算是机场刚性道面板设计的重要内容,传统采用手工在板边弯矩影响图上数格的方法,计算效率低且误差在所难免.首先建立板边弯矩影响图数据库,然后用excel内嵌的VBA功能,通过程序判断板边弯矩影响图每个网格的结点与轮印的相对位置以及在不完整网格内均匀布点的方式,采用程序计算出不同机型一个主起落架轮印覆盖的格数,即可精确计算出板边弯矩.通过算例验证表明,该方法的计算误差随着在不完整网格内均匀布点的密度增大而减小,当按照0.02网格长×0.02网格宽的密度布点时,计算误差在0.001以内.上述方法不仅可彻底避免主观因素带来的误差而且大大提高计算效率,基于上述原理还可开发出机场刚性道面设计软件.     

基于S1000D的设备级IETM研制方案

介绍了IETM的特点,阐述了S1000D标准的核心概念、基本思想及基于S1000D的IETM典型研制流程。以某型装备IETM研制为例,给出了系统级IETM研制流程,包括基础环境研制、系统级研制、设备级研制。着眼于设备级研制,提出了制约研制进度和质量的主要问题,包括编制方式问题和内容完整性问题。针对编制方式问题,提出了基于S1000D的设备级IETM研制方案。     

建立中小企业诊断专家系统的构想

运用考试法、直接认定法、临时聘请法遴选专家，组建由政府、企业和民间协会共同组成的专家系统，对中小企业（宏观）发展与（微观）运行中的问题进行咨询和诊断，是我国中小企业快速、健康发展不可缺少的条件。作者对建立这一专家系统的有关问题，提出了自己的看法。