New question #690104 on Yade:
https://answers.launchpad.net/yade/+question/690104
Hi All,
I want to get the torque of a body.
I use the following code to get the torque as well as the force.
#####################
def coon():
friction_force_cal0 = sum(O.forces.f(b)[0] for b in cylinderIDS)
friction_force_cal1 = sum(O.forces.f(b)[1] for b in cylinderIDS)
friction_force_cal2 = sum(O.forces.f(b)[2] for b in cylinderIDS)
#friction_force_cal = sum(O.forces.f(b) for b in cylinderIDS)
#torque_cal = sum(O.forces.t(b) for b in cylinderIDS)
torque_cal0 = sum(O.forces.t(b)[0] for b in cylinderIDS)
torque_cal1 = sum(O.forces.t(b)[1] for b in cylinderIDS)
torque_cal2 = sum(O.forces.t(b)[2] for b in cylinderIDS)
f_0=utils.sumForces(ids=cylinderIDS,direction =(1,0,0))
f_1=utils.sumForces(ids=cylinderIDS,direction =(0,1,0))
f_2=utils.sumForces(ids=cylinderIDS,direction =(0,0,1))
torque_0 = utils.sumTorques(ids=cylinderIDS,axis = (1,0,0),axisPt =
(0.2,0,0))
torque_1 = utils.sumTorques(ids=cylinderIDS,axis = (0,1,0),axisPt =
(0,0.2,0))
torque_2 = utils.sumTorques(ids=cylinderIDS,axis = (0,0,1),axisPt =
(0,0,0.2))
plot.addData(f1 =f_0,f2 = f_1,f3 = f_2, friction1 = friction_force_cal0,
friction2 = friction_force_cal1, friction3 =
friction_force_cal2,
torque1 = torque_cal0, torque2 = torque_cal1, torque3 =
torque_cal2,
t1 = torque_0, t2 = torque_1,t3 =
torque_2,unbalanced=unbalancedForce(),i=O.iter)
plot.saveDataTxt('alldata.txt')
#######################
the results show that f1 = friction1, f2 = friction2, f3 = friction3. this
testify the above code for forces.
while the code for torque don't give me the expeted results. (I'm thinking the
t1 should be equal to torque1.)
I found that t1 = -t2.
I don't know which one is correct for the torque.
or because of the axisPt so the torque is different.
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