选定状态变量，得出悬挂系统状态方程和振动微分方程。
The state equation and vibration differential equation of suspension system was set up through selecting state variable.
介绍了机械系统完全动力学问题的键合图法，推导出系统状态方程的统一公式。
The bond graph method for the complete dynamic problem of mechanical system is introduced. The unified formula of system state-space equations is derived.
本文以姿态误差四元数与陀螺漂移误差之间的关系为基础，构建了系统状态方程；
The state equations of the system are established on the basis of the relation between attitude error quaternion and the gyro drift.
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