Vehicle Mathematical modeling and dynamics

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Discussion Overview

The discussion revolves around the modeling of vehicle suspension dynamics, particularly focusing on the behavior of the passenger seat in response to road disturbances. Participants explore the effects of various parameters such as stiffness, damping, and mass on oscillations and system response.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant is modeling a vehicle's full suspension and is experiencing excessive bounce and oscillations in the passenger seat compared to the vehicle body.
  • Another participant suggests that the issue may be related to resonance and recommends adjusting the stiffness and damping of the passenger seat.
  • The original poster reports that increasing damping reduces oscillations but does not sufficiently decrease amplitude, indicating a persistent issue.
  • The original poster observes that decreasing the mass of the system leads to fewer oscillations and notes that positioning the passenger seat closer to the center of gravity (COG) aligns its response more closely with the body dynamics.
  • It is mentioned that moving the seat further from the COG results in increased oscillations and amplitude.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are differing views on the effectiveness of parameter adjustments and the underlying causes of the oscillations.

Contextual Notes

The discussion includes assumptions about the system's parameters and their effects, but specific mathematical relationships or models are not fully explored or resolved.

Who May Find This Useful

Individuals interested in vehicle dynamics, suspension modeling, and the effects of system parameters on oscillatory behavior may find this discussion relevant.

uzairkhan
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i am working on the vehicle full suspension model. I am in modeling phase , i am electrical student and i am facing some difficulty in the dynamic results . When i am giving road disturbance to the vehicle the pessanger seat is getting more bounce and oscillations as compared to body to which the disturbance is first transferred. The pessanger seat is modeled using its own stiffness and damping parameters. Plz clarify me the concept behind it.
 
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It is hard to tell with so little data, but you're probably in resonance. Change the stiffness and/or damping of the passenger seat and see what you get (make it stiffer).
 
thanks for suggestion , i will check it soon for the changes for which u have asked and will share the results.
 
i have checked the response of the system by changing the stiffness and damping parameters, but even then it has greater amplitude, though oscillations are reduced by increasing the damping.
One other thing i noticed is that by decresing the mass of the system i am getting minimum oscilations. Also as i am getting pessanger seat nearer to COG(where also body dynamics are being observed), the seat
and boody response getsalmost same(as it should be by geomatrical view). and as i am getting it far from the COG , it is getting more oscillations and amplitude.
 

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