航天器环境工程2018，Vol.35Issue(2)：123-127,5.DOI:10.3969/j.issn.1673-1379.2018.02.004
多自由度振动环境下惯组非线性传递特性研究
Nonlinear transfer characteristics of inertial measurement unit in vibration environment of multi-degrees of freedom
摘要
Abstract
The inertial measurement unit (IMU) is the sensor of the attitude control system. The measurement precision of the transfer characteristics of the IMU directly affects its navigation accuracy. A damper is commonly used for the vibration isolation of the IMU, obviously with nonlinear characteristics. In order to analyze the transfer characteristics of the IMU under various working conditions, this paper simplifies the IMU as a Duffing cubic stiffness model with six degrees of freedom. The differential equations of motion under the base excitation is deduced, and solved by the Runge-Kutta method. The transfer characteristics of the system under free and forced vibration conditions are analyzed. It is shown that the frequency and the amplitude of the system under the working excitation condition of multi-degrees of freedom are lower than that under the excitation of single-degree of freedom. In the working environment of the IMU, the actual test should be carried out in the vibration environment of multi-degrees of freedom.关键词
多自由度/惯组/非线性/传递特性Key words
multi-degrees of freedom/IMU/nonlinearity/transfer characteristics分类
航空航天引用本文复制引用
付玮,丁镇军,边学鹏..多自由度振动环境下惯组非线性传递特性研究[J].航天器环境工程,2018,35(2):123-127,5.
