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A full car model with 7DOFs but a problem with graphs in Oscilloscope can anyone help out?
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A full Car Model with 7 DOFs basically with 4 vertical movements of each tyre,one about x-axis of the car(Rolling Movement),one about y-axis of the car(Pitching Movement) and one vertical movement of body centroid main is to analyse the roll angle variation but variation is not proper
Mb is body mass, kg; Mt is tire mass, kg; ay is lateral acceleration of body centroid, ms -2; Ir and Ip denote body rotational inertia around X axis and Y axis respectively, kg m2 ; and denote body roll angle (positive when the car body tilts to the right) and body pitch angle (positive when the car body tilts to the front) respectively, rad; qi (i = 1, 2, 3, 4) are road vertical excitations on the wheels, m; Zti (i = 1, 2, 3, 4) are vertical displacements of the wheels, m; Zb is vertical displacement of body centroid, m; Kt is vertical stiffness of the tires, N/m; Fi (i = 1, 2, 3, 4) is suspension force, N; fdi (i = 1, 2, 3, 4) is suspension travel, m; Aei (i = 1, 2, 3, 4) are effective areas of the air springs of front left, front right, rear left, rear right respectively, m2 ; Kbf and Kbr is respectively roll stiffness of front and rear antiroll bars, Nm/rad; c is damping coefficient (equaling cc and cs in compression and stretch travel respectively.N s/m; Bf and Br are respectively front and rear wheel tracks, m; a, b are respectively the distances from body centroid to the front and rear axles, m; Og is the projection of body centroid O to the ground; ho is the height of centroid, m; hor is the height of roll center, m; hop is height of pitching center, m; T is pitching moment while vehicle turning, N m; g is gravitational acceleration, m/s2 ; Pa represents standard atmospheric pressure
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Sam Chak
2023-7-5
Hi @Vibhav
Appreciated your efforts to post the mathematical model, the graphical model, and the Simulink model. But none of them show the problem with the Oscilloscope. Assuming that you constructed the blocks correctly and inserted the right values in the equations, they are nothing to do with the Oscilloscope. Are you expecting an oscillating signal to be observed in the Oscilloscope (as shown below)?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1426728/image.jpeg)
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