- #1
tcitizen
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Hello.
I'm trying to find the torque required of an electric vehicle to pull a 1000kg trolley on four Nylon Wheels on smooth concrete. The trolley fully supports its own weight. The vehicle has 2 rubber drive wheels of Radius( r = .125m). Now I'm not sure if am on the right track because i can't find much information on Rolling resistance.
Using Fr = Crr * N to find the rolling resistive force.
Where Fr = Rolling resistance force
Crr = coefficient of rolling resistance
N = Normal force
Rolling resistance of trolley
Assuming Crr = .004
N = 1000kg * 9.81 m/s^2
Ft= (.004*9810) = 39.24
rolling resistance of vehicle
Fv = (45kg * 9.81 m/S^2 * .08)
Fv = 35.316
Ftotal = Fv +Ft
Ftotal = 35.316 + 39.24 = 74.6N
So if I use the equation for toque
T = F * r
T = 74.6 * .125
T = 9.32 N.m
This should give me the minimum required torque to get the trolley and vehicle rolling on a smooth horizontal surface. Yes/No?
Also if my system were to reach maximum velocity of 5km/h (1.389m/s) how do I find the torque needed.
Regards
tcitizen
PS I've tried to include as much information as possible.
I'm trying to find the torque required of an electric vehicle to pull a 1000kg trolley on four Nylon Wheels on smooth concrete. The trolley fully supports its own weight. The vehicle has 2 rubber drive wheels of Radius( r = .125m). Now I'm not sure if am on the right track because i can't find much information on Rolling resistance.
Using Fr = Crr * N to find the rolling resistive force.
Where Fr = Rolling resistance force
Crr = coefficient of rolling resistance
N = Normal force
Rolling resistance of trolley
Assuming Crr = .004
N = 1000kg * 9.81 m/s^2
Ft= (.004*9810) = 39.24
rolling resistance of vehicle
Fv = (45kg * 9.81 m/S^2 * .08)
Fv = 35.316
Ftotal = Fv +Ft
Ftotal = 35.316 + 39.24 = 74.6N
So if I use the equation for toque
T = F * r
T = 74.6 * .125
T = 9.32 N.m
This should give me the minimum required torque to get the trolley and vehicle rolling on a smooth horizontal surface. Yes/No?
Also if my system were to reach maximum velocity of 5km/h (1.389m/s) how do I find the torque needed.
Regards
tcitizen
PS I've tried to include as much information as possible.