摘要
针对人体数字模型准确度不足,导致汽车内人体电磁剂量安全仿真计算结果误差较大的问题,本文从三个维度提出提升人体数字模型准确度的策略.首先,采用优于传统简化自建模型的高分辨率医学成像人体数字模型;然后,考虑生物组织介电参数随频率变化的色散特性,通过MATLAB将国外不同学者测量的生物组织(以肝和各向异性的肌肉为例)介电参数进行数据对比,对国内外文献数据进行比较,验证测量数据的准确性;最后,引入基于尽可能刚性的平滑旋转增强(smoothed rotation enhanced of as-rigid-as-possible, SR-ARAP)算法,将人体数字模型的直立姿态形变为坐姿姿态,将该坐姿与某型汽车座椅的实际参数进行匹配.结果表明,医学成像人体数字模型的各个器官组织分辨率高,50分位模型单元数量在210万左右;不同学者测量的生物组织介电参数数据在中间频段的吻合度好,在低频段和高频段的一致性不佳;相较于传统的尽可能刚性(as-rigid-as-possible, ARAP)算法,SRARAP算法改善了腘窝形成的塌陷,SR-ARAP算法坐姿形变模型腿部主要组织的体积变化大多低于ARAP算法的50%,具有形变失真度低的优点.
In response to the problem of low accuracy of human digital models leading to significant simulation calculation errors in the safety of human electromagnetic dose inside automobiles,the strategy to improve the accuracy of human digital models is proposed from three aspects.Firstly,a high-resolution medical imaging human digital model that is superior to traditional simplified self-built models is adopted.Then,fully considering the dispersion characteristics of the dielectric parameters of biological tissues with frequency variation,the dielectric parameters of biological tissues measured by different scholars abroad(taking liver and anisotropic muscles as examples)were compared using MATLAB,and domestic and foreign literature data were compared to verify the accuracy of the measurement data.Finally,the smoothed rotation enhanced of as-rigid-as-possible(SR-ARAP)algorithm is introduced to transform the upright posture of the human digital model into a sitting posture,which matches the actual parameters of a certain type of car seat.The results indicate that the digital model of the human in medical imaging has high resolution of various organs and tissues,with around 2.1 million units in the 50th percentile model.The measured dielectric parameters of biological tissues by different scholars show good agreement in the mid-frequency range but poor consistency in the low-frequency and high-frequency ranges.Compared with the traditional as-rigid-as-possible(ARAP)algorithm,SR-ARAP improves the collapse of popliteal fossa formation,and the volume change of the main tissue in SR−ARAP is mostly less than 5O%of ARAP,which has the advantage of low deformation distortion.
作者
高阳春
陈兵
姜昊宇
赵晖
黎小娇
熊曼
冯锦博
雷剑梅
GAO Yangchun;CHEN Bing;JIANG Haoyu;ZHAO Hui;LI Xiaojiao;XIONG Man;FENG Jinbo;LEI Jianmei(State Key Laboratory of Intelligent Vehicle Safety Technology,Chongqing 401122,China;China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China;China Academy of Information and Communications Technology,Beijing 100191,China;School of Vehicle Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《湖南大学学报(自然科学版)》
北大核心
2025年第12期13-24,共12页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划资助项目(2023YFB3306901)。
关键词
人体数字模型
汽车
电磁剂量安全
仿真
分辨率
色散
形变失真度
human digital model
automobiles
electromagnetic dose safety
simulation
resolution
dispersion
deformation distortion
