Determing force on anti overrol construction
Determing force on anti overrol construction
(OP)
Hi there,
I am going to do the sine with dwell test on a vehicle. The vehicle can turn over on this test. For the safety of the driver, there must be an construction so that the vehicle can't turn over. The vehicle speed with this test is 80 km/h around 55 miles per hour. The steering movement can be seen in the following link.
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I use the som of moments to solve this. In the figure you can see mine VLS of the vehicle. I want to know force B, wich is the force on the anti overrol construction when the vehicle turns over. I think that B = (F*1100)/1500. And I think that F is m *a, and a is the lateral acceleration from 0.9 g, so this is around 8.3 m/s^2. Whith the vehicle mass of 3500 kg the force B would be 22661 N.
So the force on this contact surface from the anti overrol construction is 22661 N. Can anybody confirm if this is wright or wrong?
Next to this force, there is working another force on the contact surface from the anti overrol construction. This is the friction force. This is force B * the frictioncoefficient.
I am not sure of this all. I appreciate it if anybody can confirm this or when i am wrong correct me. Many thanks.
p.s. sorry for my bad English, i am from Netherland and don't have much English lessons.
Naast deze kracht werkt er naar mijn idee ook een wrijvingskracht op dit contactoppervlak van kunststof. Dit is de wrijvingscoefficient maal kracht B als ik het goed heb.
Kan iemand mijn verhaal bevestigen of juist ontkrachtigen als het niet goed is.
I am going to do the sine with dwell test on a vehicle. The vehicle can turn over on this test. For the safety of the driver, there must be an construction so that the vehicle can't turn over. The vehicle speed with this test is 80 km/h around 55 miles per hour. The steering movement can be seen in the following link.
http://w
I use the som of moments to solve this. In the figure you can see mine VLS of the vehicle. I want to know force B, wich is the force on the anti overrol construction when the vehicle turns over. I think that B = (F*1100)/1500. And I think that F is m *a, and a is the lateral acceleration from 0.9 g, so this is around 8.3 m/s^2. Whith the vehicle mass of 3500 kg the force B would be 22661 N.
So the force on this contact surface from the anti overrol construction is 22661 N. Can anybody confirm if this is wright or wrong?
Next to this force, there is working another force on the contact surface from the anti overrol construction. This is the friction force. This is force B * the frictioncoefficient.
I am not sure of this all. I appreciate it if anybody can confirm this or when i am wrong correct me. Many thanks.
p.s. sorry for my bad English, i am from Netherland and don't have much English lessons.
Naast deze kracht werkt er naar mijn idee ook een wrijvingskracht op dit contactoppervlak van kunststof. Dit is de wrijvingscoefficient maal kracht B als ik het goed heb.
Kan iemand mijn verhaal bevestigen of juist ontkrachtigen als het niet goed is.





RE: Determing force on anti overrol construction
This is created by a 'weight' transfer across the track t of WT=Mx/t
However, this number is remarkably useless to you I suspect, unless you are trying to predict wheel lift off.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction
But how I see it, the moment from the anti overrol construction must be the same as the overturning moment. Am i correct?
With the formula you given i can calculate the maximum acceleration and the maximum overturning moment, because all the weight of the right wheels where transfert to the left wheels. Then it must be correct.
But anybody know something about the friction force? If the contact surface from the anti overrol construction hits the ground there is a friction force i guess. Ffriction = B * frictioncoeffienct. Is this correct?
Thanks
RE: Determing force on anti overrol construction
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction
Do you know how I deal with the fact that one axle lifts before the other? I am now doing an internship and I still niet to learn a lot. Thanks
RE: Determing force on anti overrol construction
I haven't seen an FBD, ah ok.
B*2.5=1.1*m*latacc at rollover.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction
Do i need the wheigt transfer of both axles for this calculation or am i going in the wrong way.
RE: Determing force on anti overrol construction
So, how are you going to determine the friction coefficient? and what happens to to the forces when the puck digs in?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction
The friction coefficient is the next task. I think I must determine this experimental. I dont know if I need the static of kinematic friction. I think the kinematic.
Also the forces when the puck dugs in are unknown to me. I dont know how to determine this. Because I cant imagine it, how this will go. You have an idee?
RE: Determing force on anti overrol construction
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Determing force on anti overrol construction