In this paper, a high-energy density electromagnetic buffer (EMB) is studied and analysed for the violent acceleration and high velocity of intensive impact loads. First, the design requirements of the EMB are proposed to select reasonable structure and magnetic circuit parameters. The equivalent current model is used to introduce the primary eddy current affected by demagnetization effect and the induced secondary eddy current. The magnetization process is studied by dividing the conductor tube into the approach end and the departure end. Considering the nonlinear damping and eddy current interaction between primary and secondary, a primary-secondary eddy current loss coupled nonlinear time-step finite element model (FEM) is established to obtain the spatiotemporal distribution characteristics of eddy current. Finally, a test experiment with weak impact, medium impact and intensive impact was carried out. The measured displacement, velocity, damping force, and time nodes responses during buffering are consistent with the established time-step FEM results. The proposed high-energy density EMB can effectively complete the impact buffering process. It is reasonable to obtain the eddy current loss and its magnetization law from the established FEM which is suitable for shock buffering with different impulse strength.

中文翻译：

---

强冲击载荷下电磁缓冲器的涡流损耗及其磁化效应

本文研究并分析了高能量密度电磁缓冲器（EMB）的强烈冲击载荷的剧烈加速和高速运动。首先，提出了EMB的设计要求，以选择合理的结构和磁路参数。等效电流模型用于介绍受去磁效应影响的一次涡流和感应的二次涡流。通过将导体管分为接近端和离开端来研究磁化过程。考虑到一次与二次之间的非线性阻尼和涡流相互作用，建立了一次-二次涡流损耗耦合非线性时步有限元模型（FEM），以获得涡流的时空分布特征。最后，进行了弱影响，中等影响和强烈影响的测试实验。缓冲期间测得的位移，速度，阻尼力和时间节点响应与已建立的时间步有限元结果一致。提出的高能量密度EMB可以有效地完成冲击缓冲过程。从既定的有限元法中获得涡流损耗及其磁化规律是合理的，它适合于不同冲击强度的冲击缓冲。