| 李泉良,王肖霞,杨风暴,等.基于扇环插值的内壁多尺度热场图案的构造方法[J].内燃机工程,2023,44(4):68-76. |
| 基于扇环插值的内壁多尺度热场图案的构造方法 |
| Construction Method of Multi-Scale Thermal Field Patterns for Inner Walls Based on Fan-Ring Interpolation |
| DOI：10.13949/j.cnki.nrjgc.2023.04.009 |
| 关键词:内燃机 热场图案 多尺度 关联成像 圆弧插补 图像处理 |
| Key Words:internal combustion engine thermal field pattern multiscale correlation imaging circular interpolation image processing |
| 基金项目:内燃机可靠性国家重点实验室开放课题项目（skler–202011）；山西省回国留学人员科研资助项目（2021） |
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| 摘要:为了实现对内燃机气缸盖鼻梁区热疲劳损伤的重点监测，获得高辨识度重构影像，提出了一种基于扇环插值的多尺度热场图案构造方法。首先，结合内燃机气缸盖内壁的热场分布规律，将气缸盖火力面划分成多尺度的热场区域，剖析内壁各区域易出现热疲劳损伤的机率，确定其分辨率。其次，基于圆弧插补的思想，把划分好的多尺度热场区域离散成由多条圆弧点群组成的扇环区域。然后，对扇环区域内的每条圆弧分别进行插值得到扇环热场图案，再将各个扇环热场图案组合成多尺度热场图案。最后，将构造出的多尺度热场图案和缸盖外壁的热能进行关联运算，重构出气缸盖内壁影像。为了验证本文方法的合理性，将重构出的内壁影像与基于双线性插值构造热场图案下的重构影像进行对比分析。分析结果表明，本文采用的方法重构出的有裂纹和无裂纹气缸盖内壁影像对比度较基于双线性插值方式构造热场图案的重构影像提升了74.77%和75.09%，结构相似度和峰值信噪比也略有提升，且本文中采用的方法更利于热疲劳损伤所导致的裂纹等缺陷的检测和非重点检测区域重构影像的质量提升。 |
| Abstract:In order to achieve focused monitoring of thermal fatigue damage in the internal combustion engine cylinder head nose region and obtain highly discriminative reconstructed images， a multi-scale thermal field pattern construction method based on fan ring interpolation was proposed. Combined with the thermal field distribution law of the cylinder head inner wall of the internal combustion engine， the cylinder head fire surface was divided into multi-scale thermal field regions， and the probability of thermal fatigue damage in each area of the inner wall was dissected to determine its resolution. Then， based on the idea of arc interpolation， the divided multi-scale thermal field region was discretized into a fan ring region composed of multiple arc point groups. The fan ring thermal field pattern was obtained by interpolating each arc in the fan ring region separately， and then the fan ring thermal field pattern was combined into a multi-scale thermal field pattern. Finally， the constructed multi-scale thermal field pattern was correlated with the thermal energy of the outer wall of the cylinder head to reconstruct the image of the inner wall of the cylinder head. In order to verify the rationality of the method in this paper， the reconstructed inner wall image was compared with the reconstructed image based on the bilinear interpolation of the constructed thermal field pattern. The results show that the contrast between the reconstructed images with and without cracks are 74.77% and 75.09% respectively higher than that of the reconstructed images with the bilinear interpolation-based thermal field pattern， and the structural similarity and peak signal-to-noise ratio are also slightly improved. It is also more conducive to the detection of cracks and other defects caused by thermal fatigue damage and the quality improvement of reconstructed images of non-focused inspection areas. |
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