高 可 靠 单 向 爆 破 的 民 机 防 爆 结 构 设 计

Based on FAR25. 795 and AC25. 795-6，and considering the degree of influence of catastrophic failure states on aircraft and passengers，the design of the Least Risk Bomb Location（LRBL）structure requires that the probability of achieving a one-way blasting function for the structure is larger than 1− 10⁻⁹. A design technology of LRBL structure with high reliability unidirectional blasting is proposed. Firstly，according to the explosion-proof principle of the LRBL structure to release the energy generated by the explosion to the outside of the cabin in the specified direction，the preliminary design of the LRBL structure scheme is a cylinder structure composed of three parts：end cover，tank，and shear pin；secondly，LS-DYNA software is used to study the plastic strain of the LRBL structure under implosion，and the influence of different explosive positions and structural sizes on the plastic strain of each dangerous part of the LRBL structure is discussed. Finally，the reliability analysis of the one-way blasting function of the LRBL structure is carried out，the input sample and the output sample obtained by Latin hypercube sampling and explosion simulation，respectively，the probability distribution characteristics analyzed by the K-S test，and the reliability calculated based on the fault tree model. The results show that the proposed LRBL structure design scheme with a structural thickness of 20 mm and a shear pin diameter of 14 mm has a probability of 1−4. 07×10⁻¹⁰ in one direction，satisfying the design requirements of the LRBL structure and providing technical support for the airworthiness verification and airworthiness certification of domestic aircraft LRBL structures.