Applicability of simplified beam model of the dynamic response of the tower line system
Received:October 08, 2019  Revised:January 04, 2020
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DOI:10.7511/jslx20191008003
KeyWord:transmission tower  beam-column model  ice-shedding  dynamic response  finite element analysis
     
AuthorInstitution
杨文刚 华北电力大学 机械工程系, 保定
蒋超 华北电力大学 机械工程系, 保定
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Abstract:
      Reasonable simplification of the transmission tower can improve the efficiency of the dynamic simulation of the tower line system.This paper presents the calculation method of the simplified model of the beam and column of the self-standing tower,and proposes to use the calculation method of the simplified model of the beam and column to establish the overall model of the tower-line system of the self-supporting tower.At the same time,a truss beam hybrid model is used to establish a refined tower line system model.The static characteristics of the two model tower line systems and the dynamic characteristics such as vibration modes and natural frequencies are compared and analyzed.Taking the de-icing condition as an example,the life-and-death unit technology is used to kill the concentrated mass unit applied to the power line node to simulate de-icing,to realize the finite element simulation of the dynamic response of the tower line system,The results show that the bending deformation error of the two models is small,the low-order vibration modes are the same,the natural frequency value error is small,and the dynamic characteristics are basically the same.Under the de-icing condition,the self-supporting tower node displacement and the tower internal force time-course curve are consistent.It can effectively guarantee the calculation accuracy while improving the calculation efficiency.