We have already stated that our main concern will be the study of systems for which linear, time-invariant differential equations provide a useful model.
前已指出：我们主要关心的是用线性、时不变微分方程作为实用的模型系统。
The motion differential equations of 2 DOFs linear model for three-axle vehicle are derived in detail in this paper.
本文详细推导了三轴汽车线性二自由度模型的运动微分方程。
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