为研究圆筒型电涡流阻尼器在冲击载荷下的动力特性，建立冲击载荷下电涡流阻尼器动力学模型，利用Maxwell分析软件建立圆筒型电涡流阻尼器在冲击载荷作用下的有限元模型，分析电涡流阻尼器工作时的气隙磁场与涡流分布。研究了制动减速阶段电涡流阻尼力和阻尼系数随速度变化的关系，分析工作气隙、导体筒厚度及磁轭厚度等参数对电涡流阻尼器制动性能的影响。研制了电涡流阻尼器冲击加载试验装置，试验结果与仿真结果吻合较好。研究结果表明：在保证动子运动精度的前提下，工作气隙尽可能小，磁轭厚度取永磁体厚度的3/4，导体筒厚度取1~2 mm有利于提高电涡流阻尼器的阻尼系数；电涡流阻尼器在冲击载荷作用下具有良好的缓冲制动性能，在武器发射、列车制动等冲击制动领域具有重要的应用价值。
Abstract
Here, in order to study dynamic characteristics of cylindrical eddy current damper under impact load, the dynamic model of eddy current damper under impact load was established.The finite element model of cylindrical eddy current damper under impact load was established using the analysis software Maxwell, and the air gap magnetic field and eddy current distribution were analyzed.Relations of eddy current damping force and damping coefficient versus speed, respectively in braking deceleration stage were studied, and effects of working air gap, thickness of conductor cylinder and yoke thickness on braking performance of eddy current damper were analyzed.The impact loading test device of eddy current damper was developed, and test results agreed better with simulation ones.The study results showed that under the premise of ensuring motion accuracy of mover, working air gap should be as small as possible, yoke thickness should be 3/4 of permanent magnet thickness, and conductor cylinder thickness should be 1-2 mm, which are favorable to improve damping coefficient of eddy current damper; eddy current damper has good cushioning and braking performance under impact load, and has important application value in impact braking fields of weapon launching, train braking, etc.
关键词
电涡流阻尼器 /
冲击载荷 /
电涡流阻尼力 /
阻尼系数 /
磁场
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Key words
eddy current damper /
impact load /
eddy current damping force /
damping coefficient /
magnetic field
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参考文献
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