基于CR法的覆冰四分裂导线诱发脱冰算法研究OA北大核心CSTPCD

In order to more realistically and quickly simulate the induced de-icing process of ice-coated and split conductors,this paper develops a beam element calculation program based on the Corotational method,which can quickly and accurately simulate the large-displacement geometrically nonlinear problem of spacers.The beam element is degenerated into a rod element,which can quickly and accurately calculate the large-scale motion of the ice-coated wire space,and the reliability of the method is verified by an example.Finally,the judging criterion of the ice-coated shedding acceleration is defined,and the finite element model of the ice-coated four-split conductor induced de-icing is established.According to the finite element model,the de-icing jump height and variation law of each sub-conductor under different ice thickness,initial de-icing position and critical acceleration are studied.The results show that:the induced de-icing effect of different sub-conductors will produce different ice jump effects,which are close to 1.25 times of the non-induced de-icing mode;the induced effect caused by the lower sub-conductor is much larger than that of the upper sub-conductor;thicker or the closer the initial deicing position is to the midpoint,the smaller the critical acceleration,and the greater the induced effect.The simulation results in this paper can provide a reference for the design of transmission lines in heavy ice areas,and the simulation method proposed in this paper can provide a new research idea for the simulation of deicing and deicing of split conductors.