输电线路双摇臂落地抱杆起升动载系数理论研究  

Theoretical study on lifting dynamic load coefficient of transmission line double rocker arm landing holding pole

作　　者：马勇 孟凡豪 夏拥军 马一民 MA Yong;MENG Fanhao;XIA Yongjun;MA Yimin(Institute of Transmission and Transformation Engineering,China Electric Power Research Institute,Beijing 100055,China)

机构地区：[1]中国电力科学研究院有限公司输变电工程研究所,北京100055

出　　处：《中国工程机械学报》2024年第1期38-43,共6页Chinese Journal of Construction Machinery

基　　金：国家电网有限公司总部科技项目(5200-202033146A-0-0-00)。

摘　　要：针对现有双摇臂落地抱杆的设计计算未考虑起升效应的问题,以双摇臂落地抱杆单吊点模型为例,通过对抱杆的质量与刚度进行等效,推导起升动载系数的数学表达式,并建立相应的有限元模型来验证其正确性,最后通过试验对表达式进行修正。研究表明:起升动载系数的数学表达式为φ_(2)=1+βv_(h)的形式,起升动载系数由等效系数β和起升速度vh决定。通过仿真计算得到,抱杆的位移随加载时间的变化而增大,在达到一定峰值后,因刚度和质量的影响会出现周期性波动。起升动载系数随等效系数、冲击速度的增加而增加,仿真值与理论值的最大相对误差为3.33%,验证了起升动载系数数学表达式的正确性。通过抱杆的起吊试验,采用最小二乘法对起升动载系数数学表达式进行修正,表达式为φ_(2)=1.007+0.05vh。研究结果为双摇臂落地抱杆提供了起升动载系数计算方法,完善了抱杆的设计计算体系,提升了双摇臂落地抱杆的计算准确性与使用安全性。Taking the single lifting point model of double rocker arm landing pole as an example,the mathematical expression of the lifting dynamic load coefficient was derived based on the equivalent the mass and stiffness of the double rocker arm landing pole,which can solve the problem that the lifting effect is not considered in the design calculation of the existing double rocker arm landing pole.And then the finite element model was established to verify the correctness of the mathematical expression.Finally,the expression is modified through a test.The results show that the mathematical expression of lifting dynamic load coefficient can be written in the form ofφ_(2)=1+βv_(h),from which we could see that the lifting dynamic load coefficient was determined by the equivalent coefficientβand the lifting speed vh.Through simulation calculation,it was obtained that the displacement of the holding pole increased with the change of loading time,and it would be periodic fluctuations due to the impact of stiffness and mass after reaching a certain peak value.The lifting dynamic load coefficient increased with the increase of equivalent coefficient and impact speed,and the maximum relative error between the simulation value and the theoretical value was 3.33%,which verified the correctness of the mathematical expression of the lifting dynamic load coefficient.The mathematical expression of the lifting dynamic load coefficient was modified through the lifting test.And the expression wasφ_(2)=1.007+0.05vh.The research results provide a lifting dynamic load coefficient calculation method for the double rocker arm landing pole and improve the design calculation system of the pole,which can improve the calculation accuracy and the usage safety of the double rocker arm landing pole.

关 键 词：双摇臂落地抱杆 起升动载系数 等效系数 起升速度 试验修正 

分 类 号：TH113[机械工程—机械设计及理论]