地板下结构参数对民机适坠性的影响及优化(英文)  

Simulation Research on Influence of Civil Aircraft Sub-floor Structural Parameters to Fuselage Crashworthiness and Optimization Based on Crashworthiness

作　　者：宋笔锋[1] 苏建民[1] 苟仲秋[1] 孙侠生[2] 

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国飞机强度研究所,西安710065

出　　处：《系统仿真学报》2009年第4期993-997,1002,共6页Journal of System Simulation

基　　金：The Commission of Science and Technology for National Defense Industry civil aircraft project financial aid

摘　　要：为了确保乘员在可生存事故中存活,民机结构必须具备适坠特性。适坠性设计的关键部位为客舱地板以下结构,包括底框、行李舱底部结构和行李舱支柱三个元素。对民机典型机身结构进行了简化,利用LS-DYNA3D建立了1/4缩比动力学仿真模型,考察了行李舱支柱位置、角度及行李舱高度变化对机身坠撞特性的影响。以改善机身适坠性能为目标对地板以下结构参数进行了综合优化,优化过程采用基于均匀试验设计的Kriging近似模型,大大降低了动力学优化的计算代价。优化结果表明合理选择行李舱支柱位置、角度及行李舱高度参数可以有效改善民机机身结构的适坠性能。For ensuring occupant＇s survivability in case of survivable crash accidents, civil aircraft should have good crashworthiness. The key part of civil aircraft fuselage crashworthiness design is sub-floor structures including sub-floor frames, structures under luggage cabin and luggage cabin struts. A typical civil aircraft fuselage was simplified and a 1/4-scale dynamics simulation model based on the simplified structttre was built with LS-DYNA3D, a nonlinear dynamics analysis code. With the scale simulation model, the influence of the strut location, strut slope angle and the luggage cabin height to drop and crash properties of aircraft was investigated. For better crashworthiness, the civil aircraft fuselage subfloor structural parameters were optimized based on Kriging model built from samples determined according to Uniform Experimental Design （UED）, which couM decrease computation cost greatly. The results show that appropriate values of these structural parameters can improve the cmshworthiness of civil aircraft fuselage structures effectively.

关 键 词：适坠性 吸能 结构优化 近似模型 均匀设计 

分 类 号：V221[航空宇航科学与技术—飞行器设计]