基于有限元分析的死后头部对流热交换在线工具
- 作者: Nedugiv V.G.1, Nedugov G.V.2
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隶属关系:
- Samara National Research University
- Samara State Medical University
- 期: 卷 10, 编号 4 (2024)
- 页面: 555-565
- 栏目: 技术报告
- URL: https://bakhtiniada.ru/2411-8729/article/view/288324
- DOI: https://doi.org/10.17816/fm16175
- ID: 288324
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背景。在确定死亡时间的热测诊断领域，死后热交换的有限元分析方法是一种前景广阔的技术。相比传统的尸体冷却现象学方程，该方法能够克服其局限性。然而，目前支持这一方法的软件通常价格昂贵，并要求用户具备独立设置求解条件的能力。本文提出了一种开放式在线工具，用于基于头部颅脑热测的尸体冷却有限元分析，具有简洁的界面，可用于确定死亡时间。
研究目的。开发一个用于分析死后头部对流热交换的有限元分析在线工具。
材料与方法。构建了一个可缩放的有限元头部模型，该模型以多层球体为近似，包含1311个节点和9277个有限元。开发了用于计算初始和死后头部温度场的算法，并以Python 3编程语言实现。
研究结果。开发了在线应用程序Simple Finite Element Model of Postmortem Convective Heat Transfer of the Head，其功能包括：考虑初始温度场的特性；头部主要解剖层的尺寸和热物理特性；对流热交换强度；诊断点坐标；尸体冷却过程中外部温度的变化。该工具能够生成诊断点和头部表面在死后24小时内的冷却曲线，并输出相关数值结果。此外，还可显示有限元模型的网格几何特性、温度沿从模型中心到诊断点积分路径的分布情况。
结论。该计算在线工具无需高性能计算机或用户具备专业知识，可在法医学实践中用于通过颅脑热测法确定尸体死亡时间。
作者简介
Vladimir G. Nedugiv
Samara National Research University
Email: nedugovvg@gmail.com
ORCID iD: 0009-0007-7542-7235
SPIN 代码: 2407-7937
俄罗斯联邦, Samara
German V. Nedugov
Samara State Medical University
编辑信件的主要联系方式.
Email: nedugovh@mail.ru
ORCID iD: 0000-0002-7380-3766
SPIN 代码: 3828-8091
MD, Dr. Sci. (Medicine), Assistant Professor
俄罗斯联邦, Samara参考
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Fig. 1. The finite element model of the brain region of the head, set in an online application.
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Fig. 2. The initial temperature field of the diametrical section of the finite element model.
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Fig. 3. Graphs of cooling of the center and surface of the finite element model with sinusoidal changes in external temperature. Symbols: 1 ― temperature at a point with zero radial coordinate; 2 ― temperature at points on the surface of the finite element model; 3 ― ambient temperature. ДНС ― postmortem interval.
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