National Electric Power Conversion and Control Engineering Technology Research Center (Hunan University), Changsha, Hunan, China.
Sci Rep. 2022 Oct 27;12(1):18088. doi: 10.1038/s41598-022-22959-7.
Of crucial importance for giant magnetostrictive transducers (GMTs) design is to quickly and accurately analysis the temperature distribution. With the advantages of low calculation cost and high accuracy, thermal network modelling has been developed for thermal analysis of GMT. However, the existing thermal models have their limits to describe these complicated thermal behaviors in the GMTs: most of researches focused on steady-state which is incapable of capturing temperature variances; the temperature distribution of giant magnetostrictive (GMM) rods is generally assumed to be uniform whereas the temperature gradient on the GMM rod is remarkable due to its poor thermal conductivity; the non-uniform distribution of GMM's losses is seldom introduced into thermal model. Therefore, a transient equivalent thermal network (TETN) model of GMT is established in this paper, considering the aforementioned three aspects. Firstly, based on the structure and working principle of a longitudinal vibration GMT, thermal analysis was carried out. Following this, according to the heat transfer process of GMT, the TETN model was established and the corresponding model parameters were calculated. Finally, the accuracy of the TETN model for the temporal and spatial analysis of the transducer temperature are verified by simulation and experiment.
对于巨磁致伸缩换能器（GMT）的设计，至关重要的是快速准确地分析温度分布。由于热网络建模具有计算成本低、精度高的优点，因此已开发出用于 GMT 热分析的热网络建模。然而，现有的热模型在描述 GMT 中的这些复杂热行为方面存在其局限性：大多数研究都集中在稳态上，而稳态无法捕捉温度变化；巨磁致伸缩（GMM）棒的温度分布通常假定为均匀分布，而由于其导热性差，GMM 棒上的温度梯度非常显著；很少将 GMM 损耗的不均匀分布引入到热模型中。因此，本文建立了一种考虑上述三个方面的 GMT 瞬态等效热网络（TETN）模型。首先，根据纵向振动 GMT 的结构和工作原理进行了热分析。其次，根据 GMT 的传热过程，建立了 TETN 模型并计算了相应的模型参数。最后，通过仿真和实验验证了 TETN 模型对换能器温度的时空分析的准确性。
