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针对耳机定制设计的人耳甲腔曲面形态层级聚类算法研究与应用

朱兆华 吉晓民 高瞩 胡钢

朱兆华, 吉晓民, 高瞩, 胡钢. 针对耳机定制设计的人耳甲腔曲面形态层级聚类算法研究与应用[J]. 机械科学与技术, 2019, 38(4): 571-581. doi: 10.13433/j.cnki.1003-8728.20180217
引用本文: 朱兆华, 吉晓民, 高瞩, 胡钢. 针对耳机定制设计的人耳甲腔曲面形态层级聚类算法研究与应用[J]. 机械科学与技术, 2019, 38(4): 571-581. doi: 10.13433/j.cnki.1003-8728.20180217
Zhu Zhaohua, Ji Xiaomin, Gao Zhu, Hu Gang. A Novel Hierarchical Clustering Algorithm of Auricular Conchal Morphology for Earphone Customization Design[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(4): 571-581. doi: 10.13433/j.cnki.1003-8728.20180217
Citation: Zhu Zhaohua, Ji Xiaomin, Gao Zhu, Hu Gang. A Novel Hierarchical Clustering Algorithm of Auricular Conchal Morphology for Earphone Customization Design[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(4): 571-581. doi: 10.13433/j.cnki.1003-8728.20180217

针对耳机定制设计的人耳甲腔曲面形态层级聚类算法研究与应用

doi: 10.13433/j.cnki.1003-8728.20180217
基金项目: 

国家自然科学基金项目 51875454

详细信息
    作者简介:

    朱兆华(1988-), 博士研究生, 研究方向为产品造型设计理论与人机工效学设计, shejizhu@hotmail.com

    通讯作者:

    吉晓民, 教授, 博士生导师, 15929482661@163.com

  • 中图分类号: TB472

A Novel Hierarchical Clustering Algorithm of Auricular Conchal Morphology for Earphone Customization Design

  • 摘要: 为实现耳机大规模定制设计且满足用户使用舒适性需求的目标,提出人耳甲腔网格曲面自动重构的方法。将310个样本的耳甲腔网格曲面均重构为由795个型值点组成的NURBS曲面;进一步提出耳甲腔曲面形态层级聚类改进算法,并通过与传统分类算法结果的对比,论证改进算法的优势;其次依据分类的结果将人耳甲腔曲面形态分为29组别,从而构建针对耳机设计的耳甲腔共性特征曲面形态数据库,并通过曲面误差分析论证了数据库的可靠性;最终对耳机进行定制设计,提出基于有限元仿真分析的耳机佩戴舒适度的客观评价方法。
  • 图  1  耳甲腔特征轮廓线的提取

    图  2  耳甲腔网格曲面——NURBS曲面重构的步骤

    图  3  耳甲腔网格曲面——NURBS曲面重构的误差

    图  4  传统层级聚类算法树状图

    图  5  人耳甲腔曲面形态层级聚类改进算法树状图

    图  6  聚类组中所有样本点Pj的分布示例

    图  7  针对耳机设计的耳甲腔曲面形态数据库(前视图)

    图  8  针对耳机设计的耳甲腔曲面形态数据库(后视图)

    图  9  耳甲腔曲面形态误差分析结果对比

    图  10  利用医学MRI仪器获取的高精度人耳三维模型

    图  11  皮肤-软骨双重结构的人耳模型以及耳机三维模型

    图  12  耳机和人耳网格模型细分

    图  13  耳部等效应力分布云图

    表  1  各型值点阈值的设定

    型值点 P1 P2 P4 P5 P6 P7a P7b P7c P7d P785
    阈值 3.5 mm 3.6 mm 4.3 mm 4.6 mm 4.9 mm 4.8 mm 4.8 mm 4.9 mm 4.6 mm 5.5 mm
    下载: 导出CSV

    表  2  聚类结果

    No 起始人数 分组人数 参数a 参数b 参数c 参数d 人数比例
    1 308 66 0.84 0.40 1.32 2.95 21.4
    2 242 32 0.80 0.44 1.54 2.86 10.4
    3 210 30 0.73 0.37 1.24 2.16 9.7
    4 180 22 0.71 0.35 1.55 2.17 7.1
    5 158 21 0.89 0.42 1.35 2.61 6.8
    6 137 15 0.89 0.46 1.52 3.42 4.9
    7 122 15 0.95 0.46 1.63 2.90 4.9
    8 107 12 0.91 0.47 1.76 3.10 3.9
    9 95 12 0.68 0.37 1.25 2.15 3.9
    10 83 10 0.89 0.43 1.60 2.70 3.2
    11 73 7 0.98 0.50 1.64 2.88 2.3
    12 66 6 0.97 0.44 1.66 2.54 1.9
    13 60 5 0.90 0.44 1.46 2.84 1.6
    14 55 4 0.94 0.49 1.74 3.00 1.3
    15 51 5 1.00 0.50 1.69 2.78 1.6
    16 46 4 1.11 0.56 1.85 2.95 1.3
    17 42 5 0.75 0.46 1.89 2.97 1.6
    18 37 4 0.80 0.42 1.53 2.57 1.3
    19 33 5 1.11 0.57 2.29 3.21 1.6
    20 28 4 1.13 0.55 2.14 2.95 1.3
    21 24 3 0.87 0.45 1.83 2.44 1.0
    22 21 3 1.05 0.54 2.23 3.02 1.0
    23 18 2 0.84 0.42 1.58 2.09 0.6
    24 16 2 0.88 0.41 1.60 3.14 0.6
    25 14 3 0.93 0.45 1.68 2.54 1.0
    26 11 2 0.75 0.40 1.82 1.82 0.6
    27 9 2 0.84 0.43 2.02 2.02 0.6
    28 7 2 0.93 0.45 1.68 1.68 0.6
    29 5 2 0.48 0.31 1.65 1.65 0.6
    人数 308 305 99.0
    下载: 导出CSV

    表  3  改进层级聚类算法与传统层级聚类算法的结果对比

    聚类算法 分组数 参与样本 人数占比 参数a 参数b 参数c 参数d
    改进层级聚类算法 29 305 99% 0.88 0.44 1.68 2.62
    Single-linkage (Instastop) 24 159 52% 0.51 0.29 1.25 1.86
    Single-linkage (Laterstop) 30 265 87% 0.71 0.35 1.37 2.32
    Complete-linkage (Instastop) 27 185 61% 0.57 0.28 1.25 1.87
    Complete-linkage (Laterstop) 43 299 98% 0.73 0.39 1.51 2.51
    Mean linkage (Instastop) 27 205 67% 0.59 0.34 1.33 1.97
    Mean linkage (Laterstop) 34 283 93% 0.67 0.38 1.57 2.31
    Centroid linkage (Instastop) 27 215 70% 0.65 0.29 1.43 2.11
    Centroid linkage (Laterstop) 40 293 96% 0.81 0.40 1.62 2.45
    下载: 导出CSV

    表  4  耳甲腔关键特征尺寸

    mm
    No P1P3 P3P5 P1P5 P7aP7b P7cP7d
    1 17.13 16.57 16.25 9.27 7.09
    2 15.40 15.73 15.18 9.15 7.12
    3 16.87 14.93 15.55 8.95 7.15
    4 19.30 16.88 18.14 9.86 7.97
    5 16.65 15.84 16.85 9.49 7.25
    6 17.37 15.92 16.99 9.61 6.71
    7 16.01 15.14 14.68 9.21 6.91
    8 17.37 16.36 18.09 9.44 7.19
    9 17.58 15.05 16.63 9.73 7.55
    10 17.39 16.35 17.50 9.69 7.77
    11 17.14 17.08 16.19 10.22 7.67
    12 15.55 15.06 16.28 9.35 6.99
    13 18.09 16.31 15.24 9.56 6.96
    14 15.96 16.21 16.70 8.71 7.14
    15 17.11 17.53 14.76 7.51 7.35
    16 17.16 17.36 16.57 10.01 8.19
    17 17.34 16.87 16.41 9.43 7.17
    18 16.87 17.94 18.03 9.86 7.86
    19 19.27 17.73 19.02 10.26 7.70
    20 15.47 14.41 14.69 8.27 6.50
    21 19.50 18.34 16.49 11.28 8.87
    22 17.47 16.08 14.16 9.49 5.90
    23 17.72 14.82 16.79 8.93 6.87
    24 17.20 17.25 16.63 9.47 8.03
    25 16.69 14.83 17.41 9.21 6.94
    26 16.74 17.14 19.34 8.67 7.29
    27 19.48 17.35 15.34 10.12 7.19
    28 18.17 15.00 16.30 8.82 7.18
    29 16.61 14.18 16.63 8.83 6.52
    下载: 导出CSV

    表  5  耳廓组织及耳机材料特性

    组织 材料类型 密度/
    (kg·m-3)
    弹性模量/MPa 泊松比
    皮肤 弹性 1 000 35 0.42
    血管/神经 弹性 1 000 50 0.45
    软骨 弹性 1 600 1 200 0.20
    弹性尼龙 弹性 1 030 49.30 0.30
    下载: 导出CSV
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  • 收稿日期:  2018-06-30
  • 刊出日期:  2019-04-05

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