Influence on veer-off behavior of aircraft hydroplaning due to transverse uneven water accumulation
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摘要:
机场道面积水受多重因素影响,非均匀分布特征显著,可导致飞机偏出跑道事故,仅以单一积水厚度指标表征能力不足。对此,建立飞机滑水偏出跑道行为理论模型,基于美国足尺加载试验开展飞机轮组滑水仿真分析,分段量化机场道面横向非均匀积水分布,对比两侧飞机轮组摩阻作用差异。提出一种非均匀积水临界长度评价指标,通过ADAMS整机运动学分析探讨飞机滑行轨迹及速度变化与评价指标关联,验证其合理性与适用性。结果表明:飞机在横向非均匀积水机场道面着陆时,两侧飞机轮组所受摩阻作用存在明显时程差异;飞机处于非对称偏转力交错影响之下,偏出跑道风险贯穿着陆滑行全过程;3组案例分析所得非均匀积水临界长度与理论值相差在6.6%以下,该指标可考察由横向非均匀积水引发的偏转作用累积影响,为起降安全保障及机场道面积水控制提供参考。
Abstract:Accumulated water film on the pavement is unevenly distributed due to several factors, which may lead to an aircraft veer-off accident. The single index of water film thickness lacks the ability to characterize the water film distribution condition. In this paper, a theoretical model of the deviation behavior of aircraft hydroplaning was established. A hydroplaning simulation of an aircraft wheel group was carried out on the basis of the American full-scale test result of pavement loading. The transverse water film uneven distribution was quantified section by section. The differences in the frictional effect between both sides of aircraft wheel group were compared. It was suggested to use a new type of evaluation index called the critical length of unevenly distributed water film. The rationality and applicability of such an index were verified through a correlation study between critical length and aircraft taxing performance variation by using ADAMS-based kinematic analysis. The result indicated that notable differences exist between the time-history curve of the frictional effect between both sides of the wheel group in the case that the aircraft lands on the pavement with a transversely unevenly distributed water film. The entire landing procedure raised the likelihood of a veer-off mishap because asymmetric deviation forces constantly impact the aircraft's taxing performance. The critical length of uneven distributed water film derived from three study cases were merely 6.6% differed from theoretical results. The proposed evaluation index may take the accumulative impact of deviation forces due to transversely unevenly distributed water film into consideration, which may provide useful reference for take-off and landing safety protection and water distribution control on the pavement.
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Key words:
- aircraft wheel group /
- tire hydroplaning /
- uneven water accumulation /
- veer-off /
- ADAMS
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表 1 机场道面分段积水分布结果
Table 1. Water film distribution results of independent pavement sections
道面分段 分段变
形量/mm轻微积
水时Wi/mm中等积
水时Wi/mm重度积
水时Wi/mmD1 0.2 3.2 7.2 13.2 D2 6.2 9.2 13.2 19.2 D3 9.6 12.6 16.6 22.6 D4 9.8 12.8 16.8 22.8 D5 6.3 9.3 13.3 19.3 D6 1.6 4.6 8.6 14.6 D7 1.7 4.7 8.7 14.7 D8 2.2 5.2 9.2 15.2 D9 3.8 6.8 10.8 16.8 D10 6.6 9.6 13.6 19.6 D11 5.4 8.4 12.4 18.4 D12 3.3 6.6 10.3 16.3 表 2 飞机滑水偏出跑道行为案例参数组合
Table 2. Parameters combination of aircraft hydroplaning veer-off behavior cases
案例
编号积水
条件左轮组
接地分段右轮组
接地分段积水厚
度差/mm非均匀
积水长度/mLcw理论
值/m案例1 中等积水 D3 D8 7.4 50 137 案例2 中等积水 D3 D8 7.4 750 137 案例3 中等积水 D1 D6 1.4 750 408 -
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