一种起落架载荷谱相似性判别方法

颜灿林; 贺小帆; 李玉海

doi:10.13700/j.bh.1001-5965.2018.0421

一种起落架载荷谱相似性判别方法

doi: 10.13700/j.bh.1001-5965.2018.0421

北京航空航天大学航空科学与工程学院, 北京 100083

详细信息

作者简介:
颜灿林  男, 硕士研究生。主要研究方向:结构耐久性; 贺小帆, 男, 博士, 副教授。主要研究方向:疲劳/断裂, 结构耐久性与可靠性, 腐蚀条件下使用寿命评定, 载荷谱编制方法

贺小帆  男，博士，副教授。主要研究方向：疲劳/断裂，结构耐久性与可靠性，腐蚀条件下使用寿命评定，载荷谱编制方法

李玉海  男, 教授, 博士生导师。主要研究方向:飞机结构疲劳寿命可靠性

通讯作者:
贺小帆, E-mail:xfhe@buaa.edu.cn

中图分类号: V215.5
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出版历程
- 收稿日期: 2018-07-13
- 录用日期: 2018-10-15
- 网络出版日期: 2019-04-20

An approach for similarity discrimination on landing gear load spectrum

School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China

More Information

Corresponding author: HE Xiaofan, E-mail:xfhe@buaa.edu.cn

摘要

摘要:
起落架结构的寿命监控对保障其安全性与经济性具有重要作用，但由于地面谱复杂的高低载荷非线性交互作用，难以准确计算单机谱的损伤。以当量损伤计算方法为基础，通过对寿命监控中的单机谱进行初步筛选，判别单机谱与基准谱的相似程度，进而分析损伤计算方法的适用性。提出了一种基于时间序列分析中的动态时间弯曲方法的起落架载荷谱相似性判别方法，进行了基准谱与4个单机谱下的疲劳实验，通过分析损伤计算误差与起落架载荷谱相似距离的关系，验证所提载荷谱相似性判别方法的合理性。
- 起落架载荷谱 /
- 疲劳损伤 /
- 单机寿命监控 /
- 载荷谱相似性 /
- 动态时间弯曲
Abstract:
The life monitoring of the landing gear structure plays an important role in ensuring its safety and economy. However, it is difficult to accurately predict the fatigue damage of the individual spectrum due to the complex high-low load interaction of the ground spectrum. Therefore, based on the equivalent damage calculation method, the paper analyzes the similarity between the individual spectrum and the reference spectrum by analyzing the individual spectrum in the life monitoring, and then analyzes the applicability of the damage calculation method. An approach for comparing the similarity of landing gear load spectrum based on dynamic time warping method in time series analysis is proposed, and fatigue test under the reference spectrum and 4 individual spectra is conducted. By analyzing the relationship between the damage calculation error and the similar distance of the landing gear load spectrum, the rationality of the load spectrum similarity discrimination approach is verified.
- landing gear load spectrum /
- fatigue damage /
- individual aircraft life monitoring /
- load spectrum similarity /
- dynamic time warping

HTML全文

图 1 典型起落架载荷谱

Figure 1. Typical landing gear load spectrum

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图 2 欧氏距离匹配与DTW距离匹配对比

Figure 2. Comparison of Euclidean distance matching and dynamic time warping distance matching

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图 3 动态弯曲路径示意图^[16]

Figure 3. Illustration of dynamic warping path^[16]

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图 4 距离计算方法比较

Figure 4. Comparison of distance calculation methods

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图 5 试件几何形状

Figure 5. Geometry of specimen

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图 6 谱1部分载荷序列

Figure 6. Fractional load sequence of Spectrum 1

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图 7 起落架载荷谱相对峰值-相对超越数曲线

Figure 7. Relative peak-relative excess curves of landing gear load spectrum

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图 8 谱1下典型试件断口

Figure 8. Typical fracture surface of specimen under Spectrum 1

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图 9 谱1下主裂纹扩展(L, N)数据

Figure 9. Lead crack growth (L, N) data corresponding to Spectrum 1

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图 10 DTW距离与损伤计算误差的关系

Figure 10. Relationship between DTW distance and damage calculation error

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表 1 寿命统计结果

Table 1. Statistics results of life

载荷谱	试件数	实验寿命/起落数	计算寿命/起落数	相对误差的绝对值/%
1	5	11 067
1-1	6	17 839	11 600	34.97
2	7	10 899	10 938	0.36
3	7	6 895	8 980	30.24
4	6	9 973	8 851	11.25

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表 2 单机谱与基准谱之间的DTW距离

Table 2. DTW distance between individual spectrum and reference spectrum

载荷谱	1-1	2	3	4
DTW距离	421.5	9.1	134.9	23.5

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表 3 不同载荷谱SSF结果

Table 3. SSF results of different load spectra

载荷谱	1	1-1	2	3	4
SSF	1.195	0.672	1.146	1.148	1.266

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