自主水下航行器回旋运动总体参数敏感性分析

Sensitivity Analysis of General Parameters for Turning Performance of Autonomous Underwater Vehicle

为研究总体参数变化对自主水下航行器回旋运动稳定性的影响,针对水下航行器回旋运动总体参数的敏感性进行分析。在建立水下航行器六自由度空间运动方程的基础上,运用MATLAB/Simulink模块对水下航行器的空间回旋状态进行了数值仿真,得到了水下航行器空间回旋运动的规律。对各总体参数,如浮力、重心浮心距、重心下移量、重心侧移量变化对水下航行器的回旋速度、回旋角速度、回旋深度、回旋空间运动等回旋特性的影响进行了数值计算及分析,结果表明:浮力变化对水下航行器运动特性影响不大,重心浮心距变化会使俯仰角发生变化,重心下移量增大会提高水下航行器运行的稳定性,而重心侧移量增大则会降低其稳定性。

To study the effect of the change of general parameters on the motion stability of autonomous underwater vehicle’s turning performance,the sensitivity of general parameters of autonomous underwater vehicle was studied. The 6-DOF motion equations were established,and the three-dimensional motion model of underwater vehicle was built,and the turning pattern was numerically simulated by use of MATLAB/Simulink model,and the turning motion regulation was obtained. Taking turning performance of underwater vehicle as an example,the effects of general parameters such as buoyancy,the distance between gravity centre and buoyancy centre,the downward displacement of gravity centre and the lateral displacement of gravity centre on the turning velocity,turning angular-velocity,turning depth and turning space motion of underwater vehicle were numerically calculated and analyzed. The results show that the effect of buoyancy variation on motion performance of underwater vehicle is small;the variation of the distance between gravity centre and buoyancy centre can cause the change of pitch angle. The increase of downward displacement of gravity centre can improve the motion stability,but the increase of the lateral displacement of gravity centre can reduce the motion stability.