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首页> 外文期刊>Journal of Materials Engineering and Performance >Inverse Thermal Analysis of Welds Using Multiple Constraints and Relaxed Parameter Optimization
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Inverse Thermal Analysis of Welds Using Multiple Constraints and Relaxed Parameter Optimization

机译：使用多重约束和松弛参数优化的焊缝逆热分析

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摘要

Aspects of a methodology for inverse thermal analysis of welds are examined that provide for relaxed model-parameter optimization. These aspects are associated with the inherent insensitivity of temperature fields, obtained by inverse analysis, to local shape variations of constrained boundaries within these fields. The inverse analysis methodology is in terms of numerical-analytical basis functions for construction parametric temperature histories, which can be adopted as input data to computational procedures for further analysis. In addition, these parametric temperature histories can be used for inverse thermal analysis of welds corresponding to other process parameters or welding processes whose process conditions are within similar regimes. The inverse thermal analysis procedure provides for the inclusion of volumetric constraint conditions whose two-dimensional projections are mappings onto transverse cross sections of experimentally measured boundary conditions, such as solidification and transformation boundaries, and isothermal surfaces associated with thermocouple measurements. Issues concerning relaxed parameter optimization are discussed with respect to inverse thermal analysis of Ti-6Al-4V pulsed-mode laser welds using multiple constraint conditions.
机译：检验了对焊缝进行反向热分析的方法的各个方面，这些方法可提供宽松的模型参数优化。这些方面与通过反分析获得的温度场固有的不敏感度有关，这些温度场对这些场内受约束边界的局部形状变化不敏感。逆分析方法是根据构造参数温度历史的数值分析基础函数，可以将其用作计算程序的输入数据以进行进一步分析。另外，这些参数温度历史可用于与其他工艺参数或工艺条件在相似范围内的焊接工艺相对应的焊缝的反向热分析。逆热分析程序提供了体积约束条件，其二维投影映射到实验测量的边界条件（如凝固和转变边界）以及与热电偶测量相关的等温表面的横截面上。关于使用多个约束条件的Ti-6Al-4V脉冲模式激光焊接的逆热分析，讨论了有关松弛参数优化的问题。

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