A multi-parameter model of heat treatment process for soft magnetic materials on performance of HSERs

Material properties play an important role in the performance of electromagnetic mechanism. For an aeronautic Hermetically-Sealed Electromagnetic Relay (HSER), more than 50% parts are made of soft magnetic materials. Therefore, the performance of soft magnetic materials directly determines the static and dynamic characteristics of the HSER. Based on the theory of crystal recrystallization, this paper analyzes cold extrusion and heat treatment in the processing of soft magnetic materials, simulates the grain change process of an armature at different heat treatment temperatures, establishes a correlation model of temperature, grain size, and magnetic energy, and verifies results by scanning electron microscopy. Results of heat treatment temperatures from 800 °C to 920 °C are obtained and compared. A sample soft magnetic material after heat treatment at different temperatures has the largest difference in the initial magnetization range, up to 22%. In order to verify the fluctuation of the overall output characteristics of an HSER caused by the difference between soft magnetic materials, a static and dynamic analysis model of a typical HSER is established, and the accuracy of the model is verified by a set of actual test system. The difference of dynamic characteristics under different heat treatment temperatures is nearly 3%.     

磁洁净太阳电池电路技术进展与关键技术分析

随着重力、电磁场等科学探测任务需求的日益增强，对航天器整器的磁洁净度要求日益严格，尤其是光照条件下太阳电池电路的磁洁净度。本文基于国内外重大科学探测型号任务，梳理了国内外磁洁净太阳电池电路技术的发展历程、实现方式以及型号应用情况，并从正面布局、背面线缆以及基板厚度方向等方面系统分析了实现磁洁净太阳电池电路的关键技术:选用低磁材料、镜像对称布局与自由端线缆控制、补偿电缆，为后续磁洁净太阳电池电路技术的进一步突破提供参考。     

基于PIC-DSMC算法的嵌套霍尔推进器仿真性能研究

随着航天技术的发展，新型嵌套式霍尔推进器解决了传统单通道霍尔推进器功率不高和运行模式单一的问题，在航天领域发挥着愈加重要的作用。为了研究质量流量和磁场强度对嵌套型霍尔推进器性能的影响，本文采用PIC-DSMC算法，追踪和模拟等离子体粒子在电磁场作用下的运动和碰撞过程，对羽流场进行仿真。模拟结果表明:质量流量和磁场强度对推力贡献成正相关，推进器的比冲和羽流发散角则会受到双通道的综合影响。适当增大内通道的运行功率能够提升推进器整体效率。本文的模拟结果初步证明了嵌套霍尔推进器运行工况和磁场设计的可行性，并进一步为推进器的实验和优化提供了数据支持。     

航空磁探中潜艇磁场建模方法分析

为提高航空磁探中潜艇磁场模型精度,分析现有潜艇磁场建模方法,对边界积分法、有限元法、积分方程法、磁体模拟法等主要潜艇磁场建模方法的基本原理和推导过程进行分析。通过数值分析比较各方法的建模精度,最后归纳潜艇低空磁场建模方法的基本要点。     

基于三维原子磁强计的核磁共振陀螺仪实验优化

核磁共振陀螺仪内嵌三维原子磁强计是实现核磁共振陀螺仪小型化的一种有效途径,故介绍了一种基于三维原子磁强计的核磁共振陀螺仪.对影响三维原子磁强计性能的重要参数进行了优化,得到了较优的x轴、yy轴和z轴磁强计信号标度因子,进而实现了更灵敏的三维原子磁强计.在三维磁场闭环锁定6000 s后,测得核磁共振陀螺仪的角度随机游走和零偏稳定性分别为0.038(°)/h1/2和0.94(°)/h.