One of the main goals of submarine designers and researchers is to estimate the influence of submarine fluid dynamics for submarine-based optical tracking and pointing systems. In this study, firstly, based on the basic flow governing equation and hierarchical grids, the numerical simulation method of DNS (direct numerical simulation) is adopted to simulate the seawater flow around the submarine at 6° yaw angle and 10⁷ Reynolds number. Secondly, the transformation equations from the earth coordinate system to the optical axis system have been deduced and the ultimate influence of pressure torques on the tracking system is studied. Transfer functions of the coarse channel direct current (DC) torque motor and fine channel fast steering mirror (FSM) also have been modeled and deduced. On this basis, the time domain step responses of both subsystems are analyzed by MATLAB Simulink. Finally, performance analyses have been deduced by comparing the error variation and vortices evolution. It revealed that the frequency characteristics of multi-scale pressure pulsation mainly depended on the lengths of submarine hull or its appendage, as well as the fluid dissipation and random interaction. In general, the coarse channel appears a good compensation performance at low frequency and large amplitude error that caused by the middle-scale pressure pulsation. Contrarily, the FSM fine channel exerts an excellent control effect for higher frequency and small amplitude error caused by small-scale pressure pulsations.

潜艇设计人员和研究人员的主要目标之一是评估潜艇流体动力学对基于潜艇的光学跟踪和指向系统的影响。在这项研究中，首先，在基本流量控制方程和分层网格的基础上，采用DNS的数值模拟方法（直接数值模拟）来模拟6度偏航角和10 ⁷偏航角下潜艇周围的海水流动。雷诺数。其次，推导了从地球坐标系到光轴系统的转换方程，研究了压力转矩对跟踪系统的最终影响。还对粗通道直流（DC）转矩电机和细通道快速转向镜（FSM）的传递函数进行了建模和推导。在此基础上，通过MATLAB Simulink分析了两个子系统的时域阶跃响应。最后，通过比较误差变化和涡旋演化来推导性能分析。结果表明，多尺度压力脉动的频率特性主要取决于潜艇船体或其附属物的长度，以及流体的耗散和随机相互作用。一般来说，在中频压力脉动引起的低频大幅度误差下，粗通道表现出良好的补偿性能。相反，FSM细通道对于由小规模压力脉动引起的较高频率和较小幅度误差具有出色的控制效果。