AEROSPACE SHANGHAI, Volume. 42, Issue 2, 177(2025)
Research on Rapid Modal Frequency Prediction and Structural Fault Localization for Slender Body Aircraft
Figures & Tables(12)
Fig. 1. Flow chart for modal frequency prediction and structural fault localization
Fig. 3. Main design parameters influencing the modal frequencies of a slender body aircraft
Fig. 4. Process for solving structural fault localization problems
Fig. 5. Comparison of the predicted and expected output of the first-order mode frequencies
Fig. 6. Linear regression graph of the prediction results for future products
Table 1.
<bold>Partial system input </bold>（<bold>normalized by the maximum values</bold>）<bold> for future products </bold>（<bold>samples to be predicted</bold>） View tableView in ArticleTable 1.
<bold>Partial system input </bold>（<bold>normalized by the maximum values</bold>）<bold> for future products </bold>（<bold>samples to be predicted</bold>） 总体输入序号 第1舱质量 第3舱质量 第1舱厚度 第3舱厚度 直径 飞行器总质量 1# 0.080 0.808 0.727 0.545~0.727 1.000 1.000 2# 0.077 0.747 0.545 0.545~0.727 1.000 0.924 3# 0.081 0.742 0.909 0.909 0.971 0.935 4# 0.074 0.725 0.545 0.545~0.727 0.971 0.901 5# 0.088 0.692 0.545 0.545~0.727 0.943 0.891 6# 0.064 0.647 0.909 0.545~0.727 0.943 0.802 7# 0.076 0.661 0.545 0.545~0.727 0.914 0.836 8# 0.083 0.630 0.545 0.727~0.909 0.914 0.809 9# 0.064 0.618 0.727 0.818~1.000 0.886 0.782 10# 0.060 0.584 0.545 0.727~0.909 0.886 0.738 11# 0.075 0.600 0.545 0.545~0.727 0.857 0.774 12# 0.068 0.475 0.727 0.636~0.818 0.857 0.653
Table 2.
Three design methods for training sample database View tableView in ArticleTable 2.
Three design methods for training sample database 序号 参数枚举 参数随机赋值 输入归一化 数据库1 是 否 否 数据库2 是 否 是 数据库3 是 是 是
Table 3.
<bold>Predicted results for future products </bold>（<bold>samples to be predicted</bold>）<bold> by neural networks</bold> View tableView in ArticleTable 3.
<bold>Predicted results for future products </bold>（<bold>samples to be predicted</bold>）<bold> by neural networks</bold> 总体输入序号 1阶频率/Hz 2阶频率/Hz 3阶频率/Hz 预测值 绝对误差 预测值 绝对误差 预测值 绝对误差 1# 27.588 8 -0.033 71.676 2 -0.120 131.730 4 0.094 2# 28.561 2 -0.007 73.819 1 -0.122 135.625 8 -0.005 3# 31.559 2 0.057 76.714 9 -0.148 142.030 9 0.599 4# 27.676 5 -0.016 71.935 3 -0.138 131.989 1 -0.205 5# 26.278 6 -0.011 69.714 7 -0.075 129.141 0 -0.108 6# 27.813 1 -0.001 73.889 0 -0.261 131.192 5 -0.720 7# 25.904 3 0.011 68.626 1 -0.099 126.235 4 -0.201 8# 28.379 4 -0.002 73.660 5 -0.046 135.489 8 -0.059 9# 30.136 9 0.019 79.041 6 0.175 139.615 6 -0.319 10# 29.269 0 0.013 75.997 4 0.061 137.070 2 -0.162 11# 24.176 7 0.003 65.060 2 -0.173 119.902 4 -0.185 12# 27.384 8 -0.003 74.508 0 0.105 135.038 0 0.341
Table 4.
<bold>Measured and identified nose cone mass </bold>（<bold>normalized by the maximum values</bold>） View tableView in ArticleTable 4.
<bold>Measured and identified nose cone mass </bold>（<bold>normalized by the maximum values</bold>） 头罩序号 质量实测结果 质量辨识结果 误差/% 1# 0.648 6 0.645 1 0.53 2# 0.708 5 0.730 7 3.13 3# 0.838 3 0.833 3 0.59 4# 0.997 9 1.000 0 0.21
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Yizhe SHEN, Junkai JIA, Xiaoming SHI, Yuliu LI, Zhou HUA. Research on Rapid Modal Frequency Prediction and Structural Fault Localization for Slender Body Aircraft[J]. AEROSPACE SHANGHAI, 2025, 42(2): 177
Paper Information
Category: Simulation and Analysis
Received: Dec. 10, 2024
Accepted: --
Published Online: May. 26, 2025
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