In order to transport sensitive equipment a crate is installed inside a truck on damped springs, as

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In order to transport sensitive equipment a crate is installed inside a truck on damped springs, as shown in Figure 11.23. The suspension system of the truck, including the tyres, may be modelled as a damped spring. The various spring and damper constants are indicated in the figure. The masses of£the crate and truck are M1 and M2 respectively and their displacements from equilibrium are respectively x1(t) and x2(t). The vertical displacement of the truck as it traverses a bumpy road may be modelled by applying a force u(t) to the truck.
Show that the motion of the crate and truck may be modelled by the differential equations

Mx = K(x-x) + B (x-x) Mx = u(K + K)x + Kx - (B + B)x + BX For the particular case where M = 1, M = 3, K = 2,

Using an appropriate software package, such as MATLAB/SIMULINK, the model developed may be used as the basis for simulation studies of various scenarios.


Figure 11.23

X(1)  x (1) K ellee u(t) Crate (mass M) K B B Truck (mass M)

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