基于低偏差序列的直升机易损性计算方法

Vulnerability calculation method of helicopter based on Sobol low discrepancy sequence

直升机易损性评估中的重要一环就是要计算导弹碎片多次打击下的累积杀伤概率(多击中易损性)。首先将"Sobol低偏差序列"数值试验法引入到直升机的易损性评估中,用来产生威胁打击点的分布,然后采用随机抽样与轮盘法来确定部件杀伤状态,最后采用统计方法获得直升机累积杀伤概率。以假设的直升机在3种典型遭遇下的易损性计算为例,验证所提出方法的可行性。算例分析表明,基于低偏差序列的数值模拟法不仅可以计算直升机整机易损性,还可以用来分析不同部件的相对易损性大小,因此,可以对战伤修复和作战战术仿真提供理论指导与技术支持。

In the vulnerability assessment of helicopter, one of the important parts is to calculate the culmulated probability of kill by multiple missile fragments, namely multiple hit vulnerability.This paper firstly introduces the numerical simulation of Sobol low discrepancy sequence into helicopter vulnerability to produce the threat hit location distribution, then the random sampling and roulette wheel method is used to determine the component kill state, and the helicopter cumulated kill probability can be obtained by statistic approach.In the example, the vulnerability of three encounter cases of helicopter with missile are calculaterd, and the feasibility of proposed method is verified.Analysis shows that, the simulation method of Sobol low discrepancy sequence could not only calculate the whole helicopter vulnerability, bul also determine the relative vulnerability of its components.So, the proposed method is useful for providing the guidance and techinical support for battle damage repair and combat tactical simulation.