Through dynamic force condensing, the dynamic matrix of mega-frame is simplified, and corresponding oscillatory differential equation is obtained.

并对在该模型下建立的动力矩阵用动力凝聚法进行简化，推导了相应的振动微分方程。

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The method transfers the structural vibration differential equations into algebraic equations and the empirical formulae about fluid force coefficients is put forward.

该方法把结构振动的微分方程转化为振幅与频率的代数方程，并给出了流体力系数的经验公式。

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The characteristics of MR damper have been described by a set of nonlinear differential equations including three physical parameters such as displacement, voltage and force.

这种阻尼器的性能可通过一组非线性微分方程来描述，物理参数包括位移、电压和力。

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Mathematical models are used to simulate the rest of the car, from the gearbox and rear differential to the force exerted by the road, so that the engine is subjected to the same demands and forces as it would be in a real car.

ECONOMIST: Car design