文章摘要
隋立军,孙有朝,冯宇.随机谱载荷下无人机机翼外挂物悬挂挂架的损伤容限分析[J].空军工程大学学报:自然科学版,2021,22(3):29-32
随机谱载荷下无人机机翼外挂物悬挂挂架的损伤容限分析
A Damage Tolerance Analysis of UAVs Wing External Store Mounting Pylon under Random Spectrum
  
DOI:
中文关键词: 随机谱  无人机  外挂物  挂架  损伤容限分析
英文关键词: random spectrum  unmanned aerial vehicle  external store  pylon  damage tolerance analysis
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作者单位
隋立军,孙有朝,冯宇 1.南京航空航天大学民航学院 南京, 210016 2.中国民用航空适航审定中心西安航空器审定中心西安, 710065 3.空军工程大学航空工程学院 西安, 710038 
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中文摘要:
      机翼外挂物悬挂挂架结构的损伤容限分析是确保结构安全、实现预期目标任务的重要内容,目前针对无人机机翼外挂物悬挂挂架的损伤容限分析及研究较少。以大展弦比无人机机翼组合探头挂架为例,进行了机翼外挂物悬挂挂架损伤容限分析。根据机翼组合探头挂架的结构设计特征,建立了挂架的有限元分析模型,通过疲劳载荷工况应力分析确定了疲劳危险点,采用随机编谱方式,获得了分析部位的损伤容限载荷谱。基于断裂力学,采用Runge Kutta方法来估算裂纹扩展行为,得到了分析部位的裂纹扩展曲线,获得了裂纹扩展特性。分析结果表明,该挂架的分析部位的裂纹扩展寿命为11 615 250次飞行起落,满足预期的剩余强度值设计要求,可根据裂纹扩展寿命制定检查间隔。
英文摘要:
      The damage tolerance analysis of wing external store mounting pylon structure is an important content to ensure the safety of structure and achieve the expected target mission. At present, nobody cares to make inquires about the damage tolerance analysis and research on the UAV wing external store mounting pylon. Taking a high aspect ratio UAV wing combined probe pylon as an example, the damage tolerance analysis of the wing external store mounting pylon is made. According to the structural design features of wing combined probe pylon, a finite element analysis model of pylon is established, and the fatigue analysis dangerous points are determined by stress analysis of fatigue load conditions. And the random spectrum compilation method is adopted to obtain the damage tolerance load spectrum of the analyzed part. Based on the fracture mechanics, the Runge Kutta method is used to estimate the crack propagation behavior, obtaining the crack growth characteristics and curve of the analyzed part. The analysis results show that the crack propagation life of the analyzed part of the pylon is 11,615,250 flight cycles, meeting the expected design requirements of residual strength value. And the inspection interval can be determined according to the crack propagation life.
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