层次分析法在军队既有房屋改造方案决策中的应用

为有效解决军队既有房屋改造过程中的方案选择问题,研究了房屋改造的技术经济评价方法及其特点,在此基础上,提出了应用层次分析法,将问题的定性分析转化为定量计算。结合工程实例,根据工程的具体目标与要求构建层次结构分析模型,通过专家论证与数据收集确定同一层次之间各元素在目标衡量中所占的权重,对判断矩阵求解得出层次单排序与层次总排序。结果表明,此方法对于解决军队既有房屋改造方案决策问题具有可行性,同时增层改造方案在方案选择上具有一定的优势和良好的综合效益。  

Research on Robust Control of Nonlinear Fuzzy VSS for Spacecraft

The nonlinear dynamic system of spacecraft with uncertainty and coupling is analyzed and its general dynamical equation is given. The decoupling-ability and controllability are proved. Aiming at this system, a new nonlinear decoupling controlling method is put forward by synthetically using the variable structure and fuzzy theory. The simulation results show that this method is effective in tracking performances under the existence of uncertainty and outer disturbance.  

Position Adaptive Measurement Model for Double-four Quadrant Photoelectric Detector

A modeling method of the support vector machine combined with matrix optics is considered; a complete new measurement model for double-four quadrant photoelectric detector is built. According to the analysis of the received light spot size and its motion with the changes of the defocusing amount of detector photosensitive surface and the detector position attitude in the optical path, a mathematic expression of photoelectrical conversion is given, which can be applicable to random setting position of the detector at any time. Based on least square support vector machine （LS SVM）, the mapping relationship among the output signal linear characteristic parameters （zero neighborhood gradient and intercept）, the defocusing amount of the detector and the installation position attitude angle is established. Thus, the multiple dimensional high accuracy measuring and adjusting control system can be left out, and adaptive measurement of the detector parameters can be realized. Compared with existed measurement model and method, the presented model has the advantages of more clear physical meaning, closer to work mechanism of detector, acquiring more complete sample data and wiping out the dead spots or bad spots in measurement. And the accuracy of displacement measurement is increased to 3μm. At the same time, this measurement mode provides a technical shortcut for three-dimensional small angle measurement.  

基于工件稳定性的全区域夹紧力变向迭代规划算法

研究机械加工过程中夹紧力的合理规划是保证加工质量的核心环节,对于实现加工过程的可靠性和精密化至关重要,为此构建了全区域夹紧力变向迭代规划算法。根据工件在装夹布局中的受力状态以及工件与装夹元件之间接触力的方向约束条件,分别依据夹紧力大小与夹紧点位置的未知和已知情况,结合线性规划技术建立了力的存在性和力的可行性分析方法。在夹紧力存在的条件下,通过离散夹紧表面为点集的方法,逐点地以一定步长正向从最小值开始选取夹紧力的大小,根据当前值与上一次取值之间可行性的差异,确定下一次取值的步长及其方向,若可行性相同则以相同步长继续正向取值,否则步长减半、反向取值,直至步长的绝对值在阈值范围之内,建立全区域内夹紧力的变向迭代规划算法。该算法将连续型的夹紧力设计问题转化为离散型,不仅适合于形状复杂的工件,而且还利于计算机实现夹紧力的自动化设计。  

在建楼房损坏结构的控制爆破

介绍了某在建楼房受损部分的爆破设计与施工技术.对此楼房受损部分采取控制爆破拆除,辅以人工、机械施工方法和其它防护措施以确保不损坏与之相连的未受损部分.