海缆有限元温度场的模型验证

Model Verification of Finite Element Temperature Field of Submarine Cable

为了将有限元法应用在监测系统中同时提高其计算准确度,需要对其进行验证。查阅文献资料发现,对于使用有限元法计算的海缆温度场,计算时各种参数均为理论值,对计算结果的验证是与另一计算方法的计算结果进行对比。这种计算及验证的方法偏向于理论方面,不足以论证有限元温度场适用于工程实际。本文从监测系统的实测数据出发,提取其中的温度数据和电流数据。在光纤温度基本稳定的前提下,提取某一较低电流,以该电流及对应的光纤温度为基准,在参数的合理范围内动态修改建模参数使得参数接近实际值。确定参数后,使用其他电流值代入有限元模型计算海缆温度场并与实测数据进行比较。

In order to apply the finite element method to the monitoring system and improve its calculation accuracy, it needs to be verified. After consulting the literature, it is found that for the submarine cable temperature field calculated by the finite element method, the various parameters are theoretical values during the calculation, and the verification of the calculation result is to compare the calculation result with another calculation method. This method of calculation and verification is biased towards theory and is not sufficient to demonstrate that the finite element temperature field is suitable for engineering practice. This article starts from the measured data of the monitoring system and extracts the temperature data and current data. Under the premise that the temperature of the optical fiber is basically stable, a certain lower current is extracted, based on the current and the corresponding optical fiber temperature, and the modeling parameters are dynamically modified within a reasonable range of the parameters to make the parameters close to the actual values. After determining the parameters, use other current values to substitute into the finite element model to calculate the temperature field of the submarine cable and compare with the measured data.