Evaluation of aircraft random vibration under roughness excitation during taxiing  

作　　者：Shifu Liu Jianming Ling Yu Tian Tianxin Hou 

机构地区：[1]Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China [2]Key Laboratory of Infrastructure Durability and Operation Safety in Airfield of CAAC,Tongji University,Shanghai 201804,China

出　　处：《International Journal of Transportation Science and Technology》2024年第3期65-80,共16页交通科学与技术(英文)

基　　金：supported by the National Natural Science Foundation of China(No.U1933123).

摘　　要：The assessment of runway smoothness or roughness is intimately tied to the vibrational response of aircraft during taxiing.In this study,employing the pseudo excitation method(PEM)based on random vibration analysis,we unearthed the relationship between the ran-dom vibrations of five distinct aircraft types and runway irregularities.Initially,we estab-lished two three-dimensional(3D)models of aircraft taxiing vibration and derived the response output under roughness excitation.Subsequently,we employed MATLAB to ana-lyze the power spectral characteristics of the vibrational response in different parts of the aircraft.Lastly,we examined the effects of taxiing speed,aircraft type,runway roughness,and lift on the aircraft’s vibration.Our findings indicate that the distribution of vibration power spectral density(PSD)exhibits multiple peaks,correlating with the degrees of free-dom of the aircraft.We further note that the frequency that aligns most closely with the response peak should be the focus of investigation.High-frequency excitation impacts the pilot and nose landing gear more significantly than the passenger and main landing gear.Absent the consideration of lift,increased taxiing speed amplifies the impact of roughness excitation on aircraft taxiing safety.Larger aircrafts are more sensitive to long-wave roughness.With lift in consideration,all aircraft types exhibit a speed sensitiv-ity to vibration,which should be the primary concern in runway roughness evaluations.

关 键 词：Random vibration Runway roughness excitation Pseudo excitation method(PEM) Sensitive speed 

分 类 号：V21[航空宇航科学与技术—航空宇航推进理论与工程]