D.5 Create a suitable 2DOF Simulink Model for Quad bike with Pitch.

D.6 Using the 2DOF Simulink model, analyse road surface induced vibration. Assume road speeds from 0kph to 50 kph. Assume a simplified corrugation shape and a set of realistic road corrugation depths and wavelengths.

D.7 Create suitable damped transfer functions and use Matlab scripts to create bode plots for the damped system undergoing road surface induced vibration.

I just need help with D6 part. That is how to proceed with this in Simulink. Plz suggest the possible solutions.