New question #688763 on Yade:
https://answers.launchpad.net/yade/+question/688763
hi all,
I want to achieve the oscillation movement, as I mentioned in a previous
question.[1]
generally speaking, making the shaft rotates 200 degrees in one direction and
then reverse it back.
Here is my code.
########################
from yade import ymport
from yade import pack,export,geom
import itertools
from numpy import *
import numpy as np
from yade import plot, export, utils
import math
target=0.12
young=4e8
finalcompFricDegree=19.5
rate = 20*(2*pi/60)
############################################# sphere particles material
properties ########################
sphereMat=O.materials.append(CohFrictMat(young=young,poisson=0.3,frictionAngle=radians(finalcompFricDegree),isCohesive=False,alphaKr=0.2,alphaKtw=0,etaRoll=0.5,momentRotationLaw=True,density=2648))
#O.bodies.append(ymport.text("rotation.txt",material = sphereMat))
O.bodies.append([
sphere((0.1,0.1,0.1),.03,color=(0,1,0)),
])
################################################ create the penetrator and
shaft and the cylinder ##############################
facetMat=O.materials.append(FrictMat(young=young,poisson=0.3,frictionAngle=radians(finalcompFricDegree),density=0))
O.materials.append(FrictMat(young=young,poisson=0.3,frictionAngle=0,density=0,label='walls'))
facets =
O.bodies.append(geom.facetCylinder((200e-3,200e-3,300e-3),200e-3,600e-3,wallMask=6,material='walls',segmentsNumber=100))
x0=0.2;y0=0.2;z0=0.39665
cylinderIDS= O.bodies.append(geom.facetCylinder((x0,y0,z0-0.02),
radius=0.0125,height=0.15,orientation=Quaternion((0, 0, 1),
0),wallMask=5,segmentsNumber=10, angleRange=None,material=facetMat))
coneIDS= O.bodies.append(geom.facetCone((x0,y0,z0-0.085825-0.02),
radiusTop=0.0125,radiusBottom=0.0,height=0.02165,orientation=Quaternion((0, 0,
1), 0),wallMask=6,segmentsNumber=10, angleRange=None,material=facetMat))
conecheck=O.bodies[-1].id
################################################ set the global engine for the
simulation##############################
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys(),Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack(),Law2_ScGeom6D_CohFrictPhys_CohesionMoment(useIncrementalForm=True,always_use_moment_law=True,label='cohesiveLaw')]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=10,timestepSafetyCoefficient=0.8),
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.7),
HelixEngine(angularVelocity=rate,linearVelocity=-0.05,rotateAroundZero=True,zeroPoint=(x0,y0,z0),rotationAxis=(0,0,1),ids=cylinderIDS),
HelixEngine(angularVelocity=rate,linearVelocity=-0.05,rotateAroundZero=True,zeroPoint=(x0,y0,z0),rotationAxis=(0,0,1),ids=coneIDS),
PyRunner(command='stop_loading()',iterPeriod=10000),
PyRunner (command ="ossillation_rotation",iterPeriod = 1),
]
def ossillation_rotation():
rotationAngle = O.bodies[cylinderIDS].state.rot().norm()
if 0 < rotationAngle <= 200:
angularVelocity = rate
O.bodies[cylinderIDS].state.refOri=O.bodies[cylinderIDS].state.ori
if 0 < rotationAngle <= 200:
angularVelocity = - rate ### it seems code here is not
working.
O.bodies[cylinderIDS].state.refOri=O.bodies[cylinderIDS].state.ori
########################## stop the simulation
###################################################################
def stop_loading():
if
((O.bodies[conecheck].state.pos[2]-O.bodies[conecheck].state.refPos[2])*(-1))>target:
O.pause()
###############################
i defined a function called ossillation_rotation and use pyrunner to check it
every timestep. but it seems it doesn'e work. it rotates always in one
direction.
Thanks in advance.
Yong
[1] https://answers.launchpad.net/yade/+question/688324
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