摘要
针对仅有中间档满足舞动条件的连续档输电线路的振动幅值进行了详细研究。利用ABAQUS通用软件建立了考虑绝缘子串的连续档覆冰输电线有限元模型;通过用户自定义单元UEL对其施加空气动力载荷,获得了考虑几何非线性的连续档覆冰导线大幅振动的时域解;根据数值结果研究了只有中间档满足舞动条件时档距、档数变化对耐张段内各档导线振动幅值的影响。结果表明:舞动档导线和相邻档导线档距相差越大,舞动档导线的振动幅值越小;耐张段内档数和舞动档导线振动幅值成正比,但耐张档档数超过5之后,档数变化对舞动档导线振动幅值影响较小;若中间档覆冰导线只有部分区域满足舞动条件也可使整个连续档导线发生大幅振动。研究结果对连续档覆冰导线舞动和防舞技术的研究具有一定的参考价值。
The vibration characteristics for continuous spans only on middle galloping span are studied. The finite element model of continuous spans is set up by means of ABAQUS commercial software, and the aerodynamic load is defined by UEL. The time domain for continuous spans vibration are obtained by consideration of the non-linear influence. Galloping of multi-span transmission lines are numerically simulated to investigate the effects of various factors, including span length, number of spans and galloping region of mid span, on the amplitude. Results obtained show that the bigger the different in the length of galloping span and adjacent span, the smaller the amplitude. In strain section the amplitude is proportional to the number of spans. When the number of spans exceeds five, the number of spans has a little effect on amplitude of galloping span. Effects of span and galloping amplitude are investigated, which may provide useful reference for prevention of conductor galloping.
出处
《应用力学学报》
CAS
CSCD
北大核心
2014年第4期545-550,6,共7页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51308570
51277186)
博士点联合基金(20125522120003)
重庆市教委科技项目(KJ1400302)
关键词
舞动
有限元
连续档
输电导线
galloping,finite element,continuous spans,transmission line conductor
