Analysis on the effect of magnetic braking force of an electromagnetic damper under intensive impact load

The permanent magnet type electromagnetic damper has the advantages of no contact, no pollution, simple structure and high reliability, and it has a broad development prospect to be applied to the artillery recoil mechanism. However, the intensive impact load generated by the artillery after firing makes the acceleration of the electromagnetic damper up to 1 200 m/s2. Therefore, the influence of the magnetic braking force under the strong impact load needs to be analyzed urgently. To ensure that the electromagnetic damper can meet the requirements of the artillery recoil mechanism, the equation of recoil motion of the artillery was introduced to understand the variation of the magnetic braking force under the intensive impact load, and the analytical model and the finite element model were used to cross-validate themselves. The results show that during the recoil process, the edge effect decreases the magnetic field strength in the edge area, which reduces the magnetic braking force and the magnetic saturation increases the area of the eddy current area, which strengthens the eddy current demagnetization effect and causes the magnetic damping force curve to have a saddle , effect. By analyzing the effect of magnetic braking force, the study provides a reference for the subsequent design and optimization study of electromagnetic dampers. © 2024 Chinese Vibration Engineering Society. All rights reserved.