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To address the issues of low efficiency and low qualification rates in mesh generation for plate and shell structures, this paper proposes an intelligent finite element meshing technology based on deep learning. First, typical features of plate and shell structures are classified, and meshing strategies are developed for each feature type. Second, a feature recognition model is trained using convolutional neural networks to automatically invoke the corresponding strategies for meshing in feature regions. Finally, geometry cleanup and mesh optimization are performed for non-feature regions. Verified by the white body of a passenger car, this method increases the automatic meshing qualification rate from 82.1% to 92.6% and reduces total working hours by 66.7% compared with the mainstream batchmesh approach, significantly improving both mesh quality and efficiency. By combining AI models with predefined strategies, this technology minimizes manual intervention and provides an intelligent solution for meshing in plate and shell structures.
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为解决板壳结构网格划分效率低、合格率低等问题,提出了一种基于深度学习的板壳结构有限元网格智能划分技术。首先,对板壳结构典型特征进行分类,并为每类特征开发网格划分策略;其次,基于卷积神经网络训练特征识别模型,自动调用策略完成特征区域网格划分;最后,对非特征区域进行几何清理及网格优化。经某乘用车白车身验证,与主流batchmesh方法相比,该方法将网格自动划分合格率从82.1%提升至92.6%,总工时减少66.7%,显著改善了网格质量与效率。该技术通过AI模型与预定义策略的结合,减少了人工干预,为板壳结构网格划分提供了智能化解决方案。
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| 典型特征类别 | 初始样本量/个 | 示意图 |
| 01 | 40 668 |  |
| 02 | 6 764 |  |
| 03 | 4 355 |  |
| 04 | 4 122 |  |
| 05 | 2 161 |  |
| 06 | 3 046 |  |
| 07 | 18 956 |  |
| 08 | 1 189 |  |
| 09 | 8 980 |  |
| 10 | 3 374 |  |
| 总计 | 93 615 | |
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初始样本统计
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| 典型特征类别 | 初始样本量/个 | 示意图 |
| 01 | 40 668 |  |
| 02 | 6 764 |  |
| 03 | 4 355 |  |
| 04 | 4 122 |  |
| 05 | 2 161 |  |
| 06 | 3 046 |  |
| 07 | 18 956 |  |
| 08 | 1 189 |  |
| 09 | 8 980 |  |
| 10 | 3 374 |  |
| 总计 | 93 615 | |
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| 典型特征类别 | 初始样本数量/个 | 最终样本数量/个 |
| 01 | 40 668 | 40 668 |
| 02 | 6 764 | 8 000 |
| 03 | 4 355 | 8 000 |
| 04 | 4 122 | 8 000 |
| 05 | 2 161 | 8 000 |
| 06 | 3 046 | 8 000 |
| 07 | 18 956 | 18 956 |
| 08 | 1 189 | 8 000 |
| 09 | 8 980 | 8 980 |
| 10 | 3 374 | 8 000 |
| 合计 | 93 615 | 124 604 |
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数据增强后样本统计
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| 典型特征类别 | 初始样本数量/个 | 最终样本数量/个 |
| 01 | 40 668 | 40 668 |
| 02 | 6 764 | 8 000 |
| 03 | 4 355 | 8 000 |
| 04 | 4 122 | 8 000 |
| 05 | 2 161 | 8 000 |
| 06 | 3 046 | 8 000 |
| 07 | 18 956 | 18 956 |
| 08 | 1 189 | 8 000 |
| 09 | 8 980 | 8 980 |
| 10 | 3 374 | 8 000 |
| 合计 | 93 615 | 124 604 |
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| 编程语言 | Python 3.8.10 |
| 深度学习框架 | PyTorch 2.0.0 |
| 图形处理器 | NVIDIA TESLA P100 |
| 批大小 | 64 |
| 优化器 | SGD |
| 动量 | 0.9 |
| 学习率 | 0.001 |
| 损失函数 | CrossEntropyLoss |
| 训练轮数 | 20 |
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训练环境及参数设置
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| 编程语言 | Python 3.8.10 |
| 深度学习框架 | PyTorch 2.0.0 |
| 图形处理器 | NVIDIA TESLA P100 |
| 批大小 | 64 |
| 优化器 | SGD |
| 动量 | 0.9 |
| 学习率 | 0.001 |
| 损失函数 | CrossEntropyLoss |
| 训练轮数 | 20 |
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| 卷积神经网络架构 | 训练时间/h | 识别准确度/% |
| ResNet-50 | 9.9 | 94.40 |
| VGG-16 | 10.8 | 94.57 |
| DenseNet-121 | 10.0 | 95.00 |
| MobileNet-v2 | 9.2 | 94.09 |
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AI识别模型对比
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| 卷积神经网络架构 | 训练时间/h | 识别准确度/% |
| ResNet-50 | 9.9 | 94.40 |
| VGG-16 | 10.8 | 94.57 |
| DenseNet-121 | 10.0 | 95.00 |
| MobileNet-v2 | 9.2 | 94.09 |
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| 典型特征类别 | 示意图 | 网格划分结果 |
| 01 |  |  |
| 02 |  |  |
| 03 |  |  |
| 04 |  |  |
| 05 |  |  |
| 06 |  |  |
| 07 |  |  |
| 08 |  |  |
| 09 |  |  |
| 10 |  |  |
), ArticleFig(id=1196564301256376874, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1196563173135401102, language=CN, label=表5, caption=
典型特征网格划分结果
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| 典型特征类别 | 示意图 | 网格划分结果 |
| 01 |  |  |
| 02 |  |  |
| 03 |  |  |
| 04 |  |  |
| 05 |  |  |
| 06 |  |  |
| 07 |  |  |
| 08 |  |  |
| 09 |  |  |
| 10 |  |  |
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| 检查项 | 单元类型 | 网格质量标准 |
| 扭曲 | 壳单元 | ≤45° |
| 翘曲 | 壳单元 | ≤18° |
| 雅可比 | 壳单元 | ≥0.7 |
| 长宽比 | 壳单元 | ≤5 |
| 最小角度 | 四边形壳单元 | ≥40° |
| 最大角度 | 四边形壳单元 | ≤140° |
| 最小角度 | 三角形壳单元 | ≥20° |
| 最大角度 | 三角形壳单元 | ≤120° |
| 三角形占比 | 壳单元 | ≤5% |
| 最小尺寸 | 壳单元 | 3 mm |
| 平均尺寸 | 壳单元 | 5 mm |
| 最大尺寸 | 壳单元 | 8 mm |
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网格质量标准
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| 检查项 | 单元类型 | 网格质量标准 |
| 扭曲 | 壳单元 | ≤45° |
| 翘曲 | 壳单元 | ≤18° |
| 雅可比 | 壳单元 | ≥0.7 |
| 长宽比 | 壳单元 | ≤5 |
| 最小角度 | 四边形壳单元 | ≥40° |
| 最大角度 | 四边形壳单元 | ≤140° |
| 最小角度 | 三角形壳单元 | ≥20° |
| 最大角度 | 三角形壳单元 | ≤120° |
| 三角形占比 | 壳单元 | ≤5% |
| 最小尺寸 | 壳单元 | 3 mm |
| 平均尺寸 | 壳单元 | 5 mm |
| 最大尺寸 | 壳单元 | 8 mm |
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| 网格划分方法 | batchmesh法 | 本文方法 |
| 网格自动划分合格率 | 82.1% | 92.6% |
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网格自动划分合格率对比
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| 网格划分方法 | batchmesh法 | 本文方法 |
| 网格自动划分合格率 | 82.1% | 92.6% |
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| 网格划分方法 | batchmesh法 | 本方法 |
| 网格自动划分工时 | 0.5 | 1 |
| 网格手动优化工时 | 23.5 | 7 |
| 网格划分及优化总工时 | 24 | 8 |
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网格划分工时对比 人日
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| 网格划分方法 | batchmesh法 | 本方法 |
| 网格自动划分工时 | 0.5 | 1 |
| 网格手动优化工时 | 23.5 | 7 |
| 网格划分及优化总工时 | 24 | 8 |
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| 网格划分方法 | batchmesh法 | 本文方法 |
| 前纵梁局部网格 |  |  |
| A柱局部网格 |  |  |
), ArticleFig(id=1196564301814219314, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1196563173135401102, language=CN, label=表9, caption=
局部网格划分质量对比
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| 网格划分方法 | batchmesh法 | 本文方法 |
| 前纵梁局部网格 |  |  |
| A柱局部网格 |  |  |
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