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Spike on the graph of reaction force exerted by the ground on the rear wheel at the bump

asheshshrestha
Hi,
My two wheeler Adams model is subjected to run through the bump of height 10 cm approx. And I am interested in the ground reaction on the rear wheel at the bump when it moves with a velocity 25 km/hr. So I have plotted the ground reaction force on the wheel for a 6-second time span. I have made two graphs with different steps ( 400 steps and 600 steps ). I am pretty confused about which curve should I really trust. The curve of finner steps ( greater than 500) have spikes that show 25 KN ground reaction at the bump while in course one (less than 500 steps), it is smoother than the graph of finner steps ( no spikes at bump ) but of course, It has the effect of bump that shows 2500 N ground reaction force on rear wheel. The ground reaction at rear wheel is 1400 N at rest condition. Any logical suggestion might be helpful for me.
Thanks in advance
errortoask
errortoask2
!
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  • 0
    what kind of bump exactly was it? : It is the default Adams bump that I found in the Adams road library ( 3d_bump.rdf). The schematic of the bump is similar to :
    bump
    Yes, I too agree that there is a lot of variation in the result due to a slight change in different parameters when we use to contact between road profile and wheel tire. More importantly, there is a significant fluctuation in simulating impact fore mainly. I observe it works fine at rest condition. That's why I assume it will work fine at the dynamic condition on impact force too when a bike hits a bump.
     
    It is better to look into a graph of a standard tire from special force rather than the graph of vertical contact force.
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  • 0
    what kind of bump exactly was it? : It is the default Adams bump that I found in the Adams road library ( 3d_bump.rdf). The schematic of the bump is similar to :
    bump
    Yes, I too agree that there is a lot of variation in the result due to a slight change in different parameters when we use to contact between road profile and wheel tire. More importantly, there is a significant fluctuation in simulating impact fore mainly. I observe it works fine at rest condition. That's why I assume it will work fine at the dynamic condition on impact force too when a bike hits a bump.
     
    It is better to look into a graph of a standard tire from special force rather than the graph of vertical contact force.
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