导线覆冰脱冰有限元模拟方法的适用性分析

APPLICABILITY ANALYSIS OF FINITE ELEMENT METHODOLOGIES TO SIMULATE THE ICE-ACCRETING AND ICE-SHEDDING ON TRANSMISSION LINES

针对导线覆冰脱冰有限元分析中的附加冰单元法和改变密度法,采用相同算例进行方法的适用性分析,澄清以往学者在分析时冰参数选择的不合理之处,并提出计算时冰力学参数的合理建议值。研究表明:在应用附加冰单元法进行导线覆冰脱冰计算时,以往学者取10GPa作为冰弹性模量的取值是不合理的,根据算例结果,建议冰的弹性模量取不超过107Pa。当冰参数合理取值后的附加冰单元法与改变密度法具有等价性,均适用于导线覆冰脱冰的有限元分析。

An adjunctive ice element methodology and a density changing methodology used to analyze the ice-accreting and ice-shedding on transmission lines are investigated. The applicability analysis of the two methodologies is carried out based on an identical example. The mechanical parameters of ice used in the two methodologies are clarified and the appropriate values of ice parameters are suggested. The results from this study show that it is inappropriate for some researchers to use 10GPa as the elastic modulus of ice when applied to an adjunctive ice element methodology. According to calculating results, the elastic modulus of ice is suggested to less than 107pa. When the mechanical parameters of ice are appropriately defmed, the adjunctive ice element methodology is equivalent to the density changing methodology and both of them can be used to simulate the ice-accreting and ice-shedding on transmission lines.