随机激励下导引头伺服机构动力学特性的研究
Study on the Dynamics of the Seeker Servo Mechanism Affected by Random Excitation
Nie Xutao1;Huang Ke2
导引头伺服机构的动力学分析大多采用理想模型,较少考虑设计公差、制造误差、摩擦磨损等随机因素对系统动力学特性的影响,难以准确描述实际的动力学特性。为此,本文建立了随机激励下伺服机构的非线性动力学模型,综合运用随机平均法和点插值无网格法推导和求解系统的随机动力学FPK (Fokker-Planck-Kolmogorov)方程,计算得到了伺服机构的随机动力学响应,并且研究了摩擦参数对系统随机响应统计特征的影响,以为评价伺服机构的动力学特性提供理论依据。
Ideal models are usually used in the dynamics analysis of the seeker servo mechanism, and the influences of the random factors such as design tolerance, mismatching tolerance and wear on the system dynamics are seldom taken into account. So it is difficult to describe the actual dynamics correctly. Therefore, the nonlinear dynamics model of the servo mechanism affected by the random excitation is established. The FPK (Fokker - Planck - Kolmogorov) equations of system stochastic dynamics are deduced and solved by the stochastic averaging methods and the points interpolation meshless method synthetically. Then, the random dynamics response is calculated and the influences of the friction on the system random response characteristic are studied. This work can provide theory foundations for evaluating the dynamics of the servo mechanism.
导引头伺服机构 / 随机平均法 / 点插值无网格法 / 动力学特性 {{custom_keyword}} /
Seeker servo mechanism Stochastic averaging method Points interpolation meshless method Dynamics {{custom_keyword}} /
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