飞机-道面耦合作用下飞机随机动荷载研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (5) : 287-294.

论文

飞机-道面耦合作用下飞机随机动荷载研究

董倩1,3，张献民1,2，包伊婷1，程少锋1，张宇辉1

作者信息 +

Random dynamic load of aircraft under aircraft-pavement coupled action

DONG Qian1,3, ZHANG Xianmin1,2, BAO Yiting1, CHENG Shaofeng1, ZHANG Yuhui1

Author information +

文章历史 +

摘要

为准确确定飞机滑行过程中随时间与位置随机变化的动荷载，建立了飞机主起落架四自由度模型，分析了飞机与道面的耦合作用，利用有限元仿真技术求得了道面平整度及升力影响下的飞机随机动荷载，并根据Welch法求得了飞机动荷载的功率谱密度，探究了动荷载能量在频域内的分布规律。研究结果表明：当滑跑速度不变，国际平整度指数分别为1.56、3.12、4.68时，B737-800每个主起落架上的动荷载峰值增长了7%；当道面平整度等级不变，飞机滑跑速度由10m/s增加至40m/s，受升力影响飞机动荷载呈减小趋势；频域范围内，飞机滑跑速度提高、悬挂系统与非悬挂系统刚度的增加均导致飞机动荷载频率增大；而随着道面平整度等级的降低，飞机动荷载频率不变，仅功率谱密度峰值增大；随着飞机悬挂部分阻尼的增加，动荷载功率谱密度的峰值明显降低，但频率保持不变；而非悬挂部分的阻尼对随机动荷载功率谱密度的影响不明显。

Abstract

A four-degree-of-freedom model of the aircraft main landing gears was established to accurately calculate the aircraft dynamic loads which change randomly with time and positions during the taxiing. The coupling between aircraft and pavement was analyzed. The random dynamic load of each main landing gear of B737-800 was obtained considering the influence of pavement roughness and aircraft lift by finite element simulation technology. The power spectral density of aircraft dynamic load was obtained by the Welch method, and the rule of load energy distribution in frequency domain was explored. The research results show that when the taxiing speed remains unchanged and the International Roughness Index are 1.56, 3.12, and 4.68, the peak dynamic load on each main landing gear of the B737-800 can increase by 7%. When the International Roughness Index remains unchanged and the aircraft taxiing speed increases from 10m/s to 40m/s, the dynamic load tends to decrease under the influence of aircraft lift. The increase of taxiing speed, the increase of the suspension stiffness and the increase of non-suspension stiffness all lead to the increase of the frequency of aircraft random dynamic load. With the decrease of the pavement roughness, the frequency of aircraft dynamic load remains unchanged, and only the peak value of the power spectral density increases. With the increase of the aircraft suspension damping, the peak value of the power spectral density of the dynamic load decreases obviously, but the frequency remains unchanged. However, the damping the non-suspended part effect extremely tiny on the power spectral density of random dynamic loads.

导出引用

董倩1,3，张献民1,2，包伊婷1，程少锋1，张宇辉1. 飞机-道面耦合作用下飞机随机动荷载研究[J]. 振动与冲击, 2023, 42(5): 287-294

DONG Qian1,3, ZHANG Xianmin1,2, BAO Yiting1, CHENG Shaofeng1, ZHANG Yuhui1. Random dynamic load of aircraft under aircraft-pavement coupled action[J]. Journal of Vibration and Shock, 2023, 42(5): 287-294

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