Study on allocation and realization method of helicopter vulnerability index

直升机易损性指标分配与实现方法研究

¹ School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
² Chief Designer's Office, the First Aircraft Institute of AVIC, Xi'an 710089, China

Received: 30 September 2020

Abstract

To reduce the vulnerability of attack helicopters under fragment/projectile strikes, the method of assigning vulnerability index from the whole aircraft to critical components under single and multiple attacks is mainly studied. Under a single strike, the system components in the same direction are divided into three situations: no component overlap, nonredundant model with component overlap and redundant model with component overlap. Two index allocation methods based on the ratio of the presented area of the critical components and the ratio of the vulnerability assessment results of the critical components are proposed. The system components are divided into redundant components and non-redundant components, and an index allocation method based on the proportion of critical components' vulnerability results is proposed under multiple strikes. On this basis, combining with the vulnerability reduction measures of attack helicopters, the vulnerability index requirements of corresponding components are achieved through iterative analysis. Finally, the AH-64D helicopter is subjected to simulation tests under single and multiple strikes, and the vulnerability indexes of B-level and C-level are assigned, which verified the feasibility of the method.

摘要

为降低武装直升机在破片/弹丸打击下的易损性，主要研究在单次和多次打击下由整机向关键部件的易损性指标分配方法。通过将单次打击同一方向上的系统部件划分为非余度不重叠、非余度重叠以及重叠余度3种情况，提出基于关键部件迎弹面积比例和关键部件易损性评估结果比例的2种指标分配方法；通过将多次打击下的系统部件划分为余度部件和非余度部件，提出基于关键部件易损性结果比例的指标分配方法。在此基础上，结合武装直升机的易损性减缩措施，通过迭代分析实现对应部件的易损性指标要求。对AH-64D直升机进行单次和多次打击下的数值仿真试验，对B、C级杀伤的易损性指标进行分配，验证了方法的可行性。