水下航行体水动参数的仿真辨识

SIMULATIVE IDENTIFICATION OF HYDRAULIC PARAMETERS OF SUBMARINE MOVING BODY

首先写出描述纵平面运动的非线性微分方程,并用小扰动线性方程证明系统参数可辨识性。然后根据选定的量测方案建立观测方程,并按极大似然原理导出非线性动力学系统的参数辨识算法。最后用仿真观测数据辨识出七个水动参数。研究结果表明用水下航行体的初始响应能辨识其水动参数。

Simulative identification of the hydraulic parameter of a submarine moving body is studied by the maximum likelihood method. Nonlinear differential equations describing the longitudinal motion of the submarine moving body are shown. Identifiability of system parameters is demonstrated by linear perturbation equations. According to the selected scheme an equation is constituted for the observation. Identification algorithm for the nonlinear dynamic system, is deduced following the maximum likelihood principle. Hydraulic parameters of the submarine moving body are identified utilizing the simulative observe data, Research results show that hydraulic parameters of the submarine moving body can be identified by initial responses.