Generic Bushing Model

Let:

• t be the independent variable time
• p be a set of model coefficients or parameters used in the bushing definition
• x(t) be a set of internal states used in the bushing model
• u(t) be a set of known inputs provided to the bushing
• y(t) be the forces generated by the bushing (the outputs)

Then the general form of the equations representing a bushing is:

$$\begin{array}{l}F\left(\dot{x},x,u,p,t\right)=0\\ y\left(t\right)-G\left(x,u,p,t\right)=0\end{array}$$

The functions F(…) and G(…) depend on the bushing model that is used. The above equations can be combined into one single expression having the form:

$$H\left(\dot{x},x,u,p,y,t\right)=0$$