永磁推进电机双层隔离系统冲击响应谱分析

Shock Response Spectrum Analysis of Double Isolation System for Permanent Magnet Propulsion Motor

永磁推进电机作为潜艇推进系统的核心设备必须具有抗水下非接触爆炸冲击的能力。为比较分析不同安装方式对永磁推进电机抗冲击性能的影响。首先计算了永磁推进电机在刚性安装、单层隔离器弹性安装、双层隔离器弹性安装等工况下在时域中的加速度响应。然后按照Smallwood算法将电机的加速度响应转化为冲击响应谱。接下来比对分析以上几种安装工况下的冲击响应谱,发现:双层隔离系统的抗冲击效果好于单层隔离系统;低频布置在下层的双层隔离系统相对于高频布置在下层的双层隔离系统更有利于提高推进电机和筏架的抗冲击能力;应用双层隔离系统还需要考虑并限制电机和筏架局部最小固有频率。该研究对永磁推进电机以及其它舰船设备隔离系统的设计和选用具有一定的参考价值。

As the core equipment of submarine propulsion system, permanent magnet propulsion motor must has the capacity to resist the shock of underwater non-contact explosion. To compare and analyze the influence of different installation methods on permanent magnet propulsion motor shock resistance capacity. First, the time-domain acceleration response of permanent magnet propulsion motor in rigid installation, single isolator elastic installation and double isolator elastic installation was calculated. Next, the acceleration response of motor was converted to the shock response spectrum according to the Smallwood algorithm. Then, the shock response spectrum of the above installation was compared and analyzed, and found： the shock resistance capacity of the double isolation system is better than the single isolation system; the double isolation system which low frequency part at bottom is much better to improve the shock resistance of motor and float raft compared to the double isolation system which high frequency part at bottom; it is also necessary to consider and limit the minimum local frequency of motor and float raft when using the double isolation system. The study has a certain reference value to the design and selection of isolation system for permanent magnet propulsion motor and other ship equipment.