固体火箭技术2011，Vol.34Issue(5)：564-568,5.
飞行器设计偏差量建模方法研究
Research on modeling of flight vehicle design deviations
高显忠 1侯中喜 1刘建霞1
作者信息
- 1. 国防科技大学航天与材料工程学院,长沙410073
- 折叠
摘要
Abstract
It lays an important foundation of analyzing and evaluatiyng the performance and probabilistic design of a flight vehicle that the design variables deviations and modelled and fit into a probability density function ( PDF). For normal distribution limited in fitners and mixed Gamma distribution unable to be fit test data over the whole number axis, the method using mixed Gouss distribution to fit test data into arbitzazy functions was proposed after its rational demonstration,in which the parameters in Gauss mixed distribution was estimated by expectation maximization (EM) algorithm. The general procedure was designed,and the strategy utilizing prior distribution information and controlling incremental number of branches was proposed so as to reduce computational load and ensure the fita ccuracy. Some examples were given to illustrate the effectiveness of the method. Finally,the experiment data of axis angle deviation in an flight vehicle engine was taken as an example to show the feasibility of the proposed method in engineering application.关键词
概率密度函数/混合高斯分布/期望极大化算法/偏差量建模/飞行器设计Key words
probability density function/mixed Gauss distribution/EM algorithm/modeling of deviation/flight vehicle design分类
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高显忠,侯中喜,刘建霞..飞行器设计偏差量建模方法研究[J].固体火箭技术,2011,34(5):564-568,5.
