The Damping Characteristics Research And Design Of Eddy Current Damper

The eddy current damper has the advantages of non-contact,no friction,no wear,long life,no pollution,multi-directional damping,and has wide application prospect in vibration control field.How to design a better damping characteristics is the core of eddy current damper design under certain size,space and weight constraints.In this thesis,the influence of structural parameters on the damping characteristics of eddy current damper is studied quantitatively by theoretical calculation,numerical simulation and experimental test.The main contents and achievements of the thesis are as follows:(1)The finite element model of the parallel plate type eddy current damper is established.Based on the Maxwell electromagnetic theory,the damping characteristics of the damper under different aluminum magnetic gap,eddy current plate thickness,permanent magnet geometry and permanent magnet array spacing are analyzed.The quantitative relationship between the above structural parameters and the eddy current damping coefficient is obtained.(2)The finite element model of the eddy current damping device was established.T he relationship between the eddy current damping coefficient and the structural parameters such as the magnetic flux,the thickness of the eddy current,the geometry of the permanent magnet,and the spacing of the permanent magnet array were analyzed by Ma xwell electromagnetic simulation software.The numerical simulation results show that the damping coefficient decreases with the increase of the aluminum clearance.The damping coefficient increases with the increase of the thickness of the eddy current plate,the length of the permanent magnet and the thickness of the permanent magnet.The damping coefficient increases first and then decreases with the increase of the magnet array spacing,the damping coefficient gets the maximum value when the spacing is 0.08 times the width of the magnet.The results show that the three main factors influencing the eddy current damping coefficient are the aluminum magnetic gap,the thickness of the eddy plate and the length of the permanent magnet.(3)The test scheme of the eddy current damping characteristic is designed and the corresponding test device is set up.The test results of damping coefficient are carried out by adjusting the parameters such as aluminum magnetic gap,eddy current aluminum plate thickness,permanent magnet geometry and permanent magnet array spacing.It shows that the relative error between the simulation results and the test results is not more than 15%.The quantitative relationship between the structural parameters and the damping coefficient of the sandwich parallel plate eddy current damper is found by the above research,which provides theoretical guidance for the design and optimization of the follow-up high performance eddy current damper.