void Broadcaster::updateRotation()
{
// New quaternion, from axis-angle notation for gyro
tf::Quaternion qNew(angularVel.normalized(), angularVel.length()*dt);
// Update previous value
q *= qNew;
q.normalize();
}
void Walker::nudgeHips( Hubo_Control &hubo, zmp_traj_element_t &elem,
nudge_state_t &state, balance_gains_t &gains, double dt )
{
bool debug = false;
double kP, kD; //!< Proportional and derivative gains
int side; //!< variable for stance leg
// Figure out if we're in single or double support stance and which leg
switch(elem.stance)
{
case SINGLE_LEFT:
side = LEFT;
kP = gains.single_support_hip_nudge_kp;
kD = gains.single_support_hip_nudge_kd;
break;
case SINGLE_RIGHT:
side = RIGHT;
kP = gains.single_support_hip_nudge_kp;
kD = gains.single_support_hip_nudge_kd;
break;
case DOUBLE_LEFT:
case DOUBLE_RIGHT:
side = 100;
kP = gains.double_support_hip_nudge_kp;
kD = gains.double_support_hip_nudge_kd;
break;
default:
return;
}
// Store leg joint angels for current trajectory timestep
std::vector<Vector6d, Eigen::aligned_allocator<Vector6d> > qPrev(2);
qPrev[LEFT](HY) = elem.angles[LHY],
qPrev[LEFT](HR) = elem.angles[LHR],
qPrev[LEFT](HP) = elem.angles[LHP],
qPrev[LEFT](KN) = elem.angles[LKN],
qPrev[LEFT](AP) = elem.angles[LAP],
qPrev[LEFT](AR) = elem.angles[LAR];
qPrev[RIGHT](HY) = elem.angles[RHY],
qPrev[RIGHT](HR) = elem.angles[RHR],
qPrev[RIGHT](HP) = elem.angles[RHP],
qPrev[RIGHT](KN) = elem.angles[RKN],
qPrev[RIGHT](AP) = elem.angles[RAP],
qPrev[RIGHT](AR) = elem.angles[RAR];
// Skew matrix for torque reaction logic
Eigen::Matrix3d skew;
skew << 0, 1, 0,
-1, 0, 0,
0, 0, 0;
// Proportional gain matrix for ankle roll and pitch
Eigen::Matrix3d shiftGainsKp;
shiftGainsKp << kP, 0, 0,
0, kP, 0,
0, 0, 0;
// Derivative gain matrix for ankle roll and pitch
Eigen::Matrix3d shiftGainsKd;
shiftGainsKd << kD, 0, 0,
0, kD, 0,
0, 0, 0;
// Get rotation matrix for each hip yaw
std::vector< Eigen::Matrix3d, Eigen::aligned_allocator<Eigen::Matrix3d> > yawRot(2);
yawRot[LEFT] = Eigen::AngleAxisd(hubo.getJointAngle(LHY), Eigen::Vector3d::UnitZ()).toRotationMatrix();
yawRot[RIGHT]= Eigen::AngleAxisd(hubo.getJointAngle(RHY), Eigen::Vector3d::UnitZ()).toRotationMatrix();
// TF for body to each foot
std::vector< Eigen::Isometry3d, Eigen::aligned_allocator<Eigen::Isometry3d> > footTF(2);
// New joint angles for both legs
std::vector< Vector6d, Eigen::aligned_allocator<Vector6d> > qNew(2);
// Ankle torque error XYZ (ie. Roll/Pitch/Yaw), but just setting Z to zero.
Vector3d torqueErr[2];
// Determine how much we need to nudge to hips over to account for
// error in ankle torques about the x- and y- axes.
// If Roll torque is positive (ie. leaning left) we want hips to go right (ie. negative y-direction)
// If Pitch torque is positive (ie. leaning back) we want hips to go forward (ie. positive x-direction)
// Get TFs for feet
hubo.huboLegFK( footTF[LEFT], qPrev[LEFT], LEFT );
hubo.huboLegFK( footTF[RIGHT], qPrev[RIGHT], RIGHT );
std::cout << "foot is supposedly at " << footTF[LEFT].translation().transpose() << "\n";
// Averaged torque error in ankles (roll and pitch) (yaw is always zero)
//FIXME The version below is has elem.torques negative b/c hubomz computes reaction torque at ankle
// instead of torque at F/T sensor
torqueErr[LEFT](0) = (-elem.torque[LEFT][0] - hubo.getLeftFootMx());
torqueErr[LEFT](1) = (-elem.torque[LEFT][1] - hubo.getLeftFootMy());
torqueErr[LEFT](2) = 0;
torqueErr[RIGHT](0) = (-elem.torque[RIGHT][0] - hubo.getRightFootMx());
torqueErr[RIGHT](1) = (-elem.torque[RIGHT][1] - hubo.getRightFootMy());
torqueErr[RIGHT](2) = 0;
// Feet position errors (x,y)
Vector3d instantaneousFeetOffset;
// Check if we're on the ground, if not set instantaneous feet offset
// to zero so integrated feet offset doesn't change, but we still apply it.
const double forceThreshold = 20; // Newtons
if(hubo.getLeftFootFz() + hubo.getRightFootFz() > forceThreshold)
{
std::cout << "Fzs = " << hubo.getLeftFootFz() << ", " << hubo.getRightFootFz() << "\n";
if (side != LEFT && side != RIGHT)
{
instantaneousFeetOffset = (dt*shiftGainsKp * (yawRot[LEFT]*skew*torqueErr[LEFT] + yawRot[RIGHT]*skew*torqueErr[RIGHT])/2)
- (shiftGainsKd * (yawRot[LEFT]*skew*(torqueErr[LEFT] - state.prevTorqueErr[LEFT])
+ yawRot[RIGHT]*skew*(torqueErr[RIGHT] - state.prevTorqueErr[RIGHT]))/2);
}
else
{
instantaneousFeetOffset = (dt*shiftGainsKp * yawRot[side]*skew*torqueErr[side])
- (shiftGainsKd * yawRot[side]*skew*(torqueErr[side] - state.prevTorqueErr[side]));
}
}
else
instantaneousFeetOffset.setZero();
// Decay the integratedFeetOffset
state.integratedFeetOffset -= gains.decay_gain[LEFT]*state.integratedFeetOffset;
// Add the instantaneous feet offset to the integrator
state.integratedFeetOffset += instantaneousFeetOffset;
const double integratedFeetOffsetTol = 0.06;
double n = state.integratedFeetOffset.norm();
if (n > integratedFeetOffsetTol) {
state.integratedFeetOffset *= integratedFeetOffsetTol/n;
}
// Pretranslate feet TF by integrated feet error translation vector
footTF[LEFT].pretranslate(state.integratedFeetOffset);
footTF[RIGHT].pretranslate(state.integratedFeetOffset);
// Run IK on the adjusted feet TF to get new joint angles
bool ok = true;
ok = hubo.huboLegIK(qNew[LEFT], footTF[LEFT], qPrev[LEFT], LEFT);
if(ok)
ok = hubo.huboLegIK(qNew[RIGHT], footTF[RIGHT], qPrev[RIGHT], RIGHT);
// TODO: FIXME: MZ doesn't like the above code, he will explain
hubo.huboLegFK( footTF[LEFT], qNew[LEFT], LEFT );
std::cout << "now foot is supposedly at " << footTF[LEFT].translation().transpose() << "\n";
if(debug)
{
std::cout //<< " K: " << kP
//<< " TdL: " << -elem.torque[LEFT][0] << ", " << -elem.torque[LEFT][1]
//<< " TdR: " << -elem.torque[RIGHT][0] << ", " << -elem.torque[RIGHT][1]
//<< " MyLR: " << hubo.getLeftFootMy() << ", " << hubo.getRightFootMy()
//<< " MxLR: " << hubo.getLeftFootMx() << ", " << hubo.getRightFootMx()
//<< " Te: " << torqueErr.transpose()
//<< " Fte: " << instantaneousFeetOffset.transpose()
//<< " qDfL: " << (qNew[LEFT] - qPrev[LEFT]).transpose()
<< " FeetE: " << state.integratedFeetOffset.transpose()
<< "\tqDfR: " << qNew[RIGHT].transpose()
<< "\n";
}
//ok = false;
// Set leg joint angles for current timestep of trajectory
if(ok)
{
elem.angles[LHY] = qNew[LEFT](HY);
elem.angles[LHR] = qNew[LEFT](HR);
elem.angles[LHP] = qNew[LEFT](HP);
elem.angles[LKN] = qNew[LEFT](KN);
elem.angles[LAP] = qNew[LEFT](AP);
elem.angles[LAR] = qNew[LEFT](AR);
elem.angles[RHY] = qNew[RIGHT](HY);
elem.angles[RHR] = qNew[RIGHT](HR);
elem.angles[RHP] = qNew[RIGHT](HP);
elem.angles[RKN] = qNew[RIGHT](KN);
elem.angles[RAP] = qNew[RIGHT](AP);
elem.angles[RAR] = qNew[RIGHT](AR);
}
else
std::cout << "IK Invalid\n";
// Save current force torque readings for next iteration
for(int i=0; i<2; i++)
state.prevTorqueErr[i] = torqueErr[i];
}
