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| Dynamic characteristics of cylindrical eddy current damper under impact load |
| WANG Nannan, LIU Ning, SHEN Yanping, SUN Mingliang |
| School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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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.
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Received: 17 February 2020
Published: 15 June 2021
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