rbdlsim/3rdparty/rbdl/tests/TwolegModelTests.cc

#include <UnitTest++.h>

#include <iostream>

#include "rbdl/Logging.h"

#include "rbdl/Model.h"
#include "rbdl/Constraints.h"
#include "rbdl/Dynamics.h"
#include "rbdl/Kinematics.h"

using namespace std;
using namespace RigidBodyDynamics;
using namespace RigidBodyDynamics::Math;

const double TEST_PREC = 1.0e-13;

unsigned int hip_id,
     upper_leg_right_id,
     lower_leg_right_id,
     foot_right_id,
     upper_leg_left_id,
     lower_leg_left_id,
     foot_left_id;

Body hip_body,
     upper_leg_right_body,
     lower_leg_right_body,
     foot_right_body,
     upper_leg_left_body,
     lower_leg_left_body,
     foot_left_body;

Joint joint_txtyrz (
    SpatialVector (0., 0., 0., 1., 0., 0.),
    SpatialVector (0., 0., 0., 0., 1., 0.),
    SpatialVector (0., 0., 1., 0., 0., 0.)
    );
Joint joint_rot_z (SpatialVector (0., 0., 1., 0., 0., 0.));

VectorNd Q;
VectorNd QDot;
VectorNd QDDot;
VectorNd Tau;

ConstraintSet constraint_set_right;
ConstraintSet constraint_set_left;
ConstraintSet constraint_set_left_flat;
ConstraintSet constraint_set_both;

enum ParamNames {
  ParamSteplength = 0,
  ParamNameLast
};

enum PosNames {
  PosHipPosX,
  PosHipPosY,
  PosHipRotZ,
  PosRightThighRotZ,
  PosRightShankRotZ,
  PosRightAnkleRotZ,
  PosLeftThighRotZ,
  PosLeftShankRotZ,
  PosLeftAnkleRotZ,
  PosNameLast
};

enum StateNames {
  StateHipPosX,
  StateHipPosY,
  StateHipRotZ,
  StateRightThighRotZ,
  StateRightShankRotZ,
  StateRightAnkleRotZ,
  StateLeftThighRotZ,
  StateLeftShankRotZ,
  StateLeftAnkleRotZ,
  StateHipVelX,
  StateHipVelY,
  StateHipRotVelZ,
  StateRightThighRotVelZ,
  StateRightShankRotVelZ,
  StateRightAnkleRotVelZ,
  StateLeftThighRotVelZ,
  StateLeftShankRotVelZ,
  StateLeftAnkleRotVelZ,
  StateNameLast
};

enum ControlNames {
  ControlRightThighRotZ,
  ControlRightKneeRotZ,
  ControlRightAnkleRotZ,
  ControlLeftThighRotZ,
  ControlLeftKneeRotZ,
  ControlLeftAnkleRotZ,
  ControlNameLast
};

enum SegmentLengthsNames {
  SegmentLengthsHip = 0,
  SegmentLengthsThigh,
  SegmentLengthsShank,
  SegmentLengthsFootHeight,
  SegmentLengthsFoot,
  SegmentLengthsNameLast
};

const double ModelMass = 73.;
const double ModelHeight = 1.741;

// absolute lengths!
double segment_lengths[SegmentLengthsNameLast] = {
  0.4346,
  0.4222,
  0.4340,
  0.0317,
  0.2581
};

enum JointLocations {
  JointLocationHip = 0,
  JointLocationKnee,
  JointLocationAnkle,
  JointLocationLast
};

Vector3d joint_location[JointLocationLast] = {
  Vector3d (0., 0., 0.),
  Vector3d (0., - 0.2425 * ModelHeight, 0.),
  Vector3d (0., - 0.2529 * ModelHeight, 0.)
};

enum SegmentMassNames {
  SegmentMassHip,
  SegmentMassThigh,
  SegmentMassShank,
  SegmentMassFoot,
  SegmentMassLast
};

double segment_mass[SegmentMassLast] = {
  0.4346 * ModelMass,
  0.1416 * ModelMass,
  0.0433 * ModelMass,
  0.0137 * ModelMass
};

enum COMNames {
  COMHip,
  COMThigh,
  COMShank,
  COMFoot,
  COMNameLast
};

Vector3d com_position[COMNameLast] = {
  Vector3d (0., 0.3469 * ModelHeight, 0.),
  Vector3d (0., 0.2425 * ModelHeight, 0.),
  Vector3d (0., 0.2529 * ModelHeight, 0.),
  Vector3d (0.0182 * ModelHeight, 0., 0.)
};

enum RGyrationNames {
  RGyrationHip,
  RGyrationThigh,
  RGyrationShank,
  RGyrationFoot,
  RGyrationLast
};

Vector3d rgyration[RGyrationLast] = {
  Vector3d (0.1981, 0.1021, 0.1848),
  Vector3d (0.1389, 0.0629, 0.1389),
  Vector3d (0.1123, 0.0454, 0.1096),
  Vector3d (0.0081, 0.0039, 0.0078)
};

Vector3d heel_point (0., 0., 0.);
Vector3d medial_point (0., 0., 0.);

void init_model (Model* model) {
  assert (model);
  
  constraint_set_right = ConstraintSet();
  constraint_set_left = ConstraintSet();
  constraint_set_left_flat = ConstraintSet();
  constraint_set_both = ConstraintSet();

  model->gravity = Vector3d (0., -9.81, 0.);

  // hip
  hip_body = Body (segment_mass[SegmentMassHip], com_position[COMHip], rgyration[RGyrationHip]);

  // lateral right
  upper_leg_right_body = Body (segment_mass[SegmentMassThigh], com_position[COMThigh], rgyration[RGyrationThigh]);
  lower_leg_right_body = Body (segment_mass[SegmentMassShank], com_position[COMShank], rgyration[RGyrationShank]);
  foot_right_body = Body (segment_mass[SegmentMassFoot], com_position[COMFoot], rgyration[RGyrationFoot]);

  // lateral left
  upper_leg_left_body = Body (segment_mass[SegmentMassThigh], com_position[COMThigh], rgyration[RGyrationThigh]);
  lower_leg_left_body = Body (segment_mass[SegmentMassShank], com_position[COMShank], rgyration[RGyrationShank]);
  foot_left_body = Body (segment_mass[SegmentMassFoot], com_position[COMFoot], rgyration[RGyrationFoot]);

  // add hip to the model (planar, 3 DOF)
  hip_id = model->AddBody (0, Xtrans (Vector3d (0., 0., 0.)), joint_txtyrz, hip_body);

  //
  // right leg
  //

  unsigned int temp_id = 0;

  // add right upper leg
  temp_id = model->AddBody (hip_id, Xtrans (Vector3d(0., 0., 0.)), joint_rot_z, upper_leg_right_body);
  upper_leg_right_id = temp_id;

  // add the right lower leg (only one DOF)
  temp_id = model->AddBody (temp_id, Xtrans (joint_location[JointLocationKnee]), joint_rot_z, lower_leg_right_body);
  lower_leg_right_id = temp_id;

  // add the right foot (1 DOF)
  temp_id = model->AddBody (temp_id, Xtrans (joint_location[JointLocationAnkle]), joint_rot_z, foot_right_body);
  foot_right_id = temp_id;

  //
  // left leg
  //

  // add left upper leg
  temp_id = model->AddBody (hip_id, Xtrans (Vector3d(0., 0., 0.)), joint_rot_z, upper_leg_left_body);
  upper_leg_left_id = temp_id;

  // add the left lower leg (only one DOF)
  temp_id = model->AddBody (temp_id, Xtrans (joint_location[JointLocationKnee]), joint_rot_z, lower_leg_left_body);
  lower_leg_left_id = temp_id;

  // add the left foot (1 DOF)
  temp_id = model->AddBody (temp_id, Xtrans (joint_location[JointLocationAnkle]), joint_rot_z, foot_left_body);
  foot_left_id = temp_id;

  //	cerr << "--- model created (" << model->dof_count << " DOF) ---" << endl;

  // contact data

  // the contact points for heel and toe
  heel_point.set (-0.05, -0.0317, 0.);
  medial_point.set  (-0.05, -0.0317 + segment_lengths[SegmentLengthsFoot], 0.);

  constraint_set_right.AddContactConstraint(foot_right_id, heel_point, Vector3d (1., 0., 0.), "right_heel_x");
  constraint_set_right.AddContactConstraint(foot_right_id, heel_point, Vector3d (0., 1., 0.), "right_heel_y");

  constraint_set_left.AddContactConstraint(foot_left_id, heel_point, Vector3d (1., 0., 0.), "left_heel_x");
  constraint_set_left.AddContactConstraint(foot_left_id, heel_point, Vector3d (0., 1., 0.), "left_heel_y");

  constraint_set_both.AddContactConstraint(foot_right_id, heel_point, Vector3d (1., 0., 0.), "right_heel_x");
  constraint_set_both.AddContactConstraint(foot_right_id, heel_point, Vector3d (0., 1., 0.), "right_heel_y");
  constraint_set_both.AddContactConstraint(foot_right_id, heel_point, Vector3d (0., 0., 1.), "right_heel_z");

  constraint_set_both.AddContactConstraint(foot_left_id, heel_point, Vector3d (1., 0., 0.), "left_heel_x");
  constraint_set_both.AddContactConstraint(foot_left_id, heel_point, Vector3d (0., 1., 0.), "left_heel_y");
  constraint_set_both.AddContactConstraint(foot_left_id, heel_point, Vector3d (0., 0., 1.), "left_heel_z");

  constraint_set_right.Bind (*model);
  constraint_set_left.Bind (*model);
  constraint_set_both.Bind (*model);
}

template <typename T>
void copy_values (T *dest, const T *src, size_t count) {
  memcpy (dest, src, count * sizeof (T));
}

TEST ( TestForwardDynamicsConstraintsDirectFootmodel ) {
  Model* model = new Model;

  init_model(model);

  Q.resize(model->dof_count);
  QDot.resize(model->dof_count);
  QDDot.resize(model->dof_count);
  Tau.resize(model->dof_count);

  Q[0] = -0.2;
  Q[1] = 0.9;
  Q[2] = 0;
  Q[3] = -0.15;
  Q[4] = -0.15;
  Q[5] = 0.1;
  Q[6] = 0.15;
  Q[7] = -0.15;
  Q[8] = 0;

  QDot.setZero();

  Tau[0] = 0;
  Tau[1] = 0;
  Tau[2] = 0;
  Tau[3] = 1;
  Tau[4] = 1;
  Tau[5] = 1;
  Tau[6] = 1;
  Tau[7] = 1;
  Tau[8] = 1;

  Vector3d contact_accel_left;
  Vector3d contact_vel_left;
  Vector3d contact_force = Vector3d::Zero();

  VectorNd QDDot_aba (QDDot);
  VectorNd QDDot_lag (QDDot);
  ForwardDynamics (*model, Q, QDot, Tau, QDDot_aba);
  ForwardDynamicsLagrangian (*model, Q, QDot, Tau, QDDot_lag);

  //	cout << "QDDot_aba = " << QDDot_aba.transpose() << endl;
  //	cout << "QDDot_lag = " << QDDot_lag.transpose() << endl;

  unsigned int body_id = constraint_set_left.body[0];
  Vector3d contact_point = constraint_set_left.point[0];

  MatrixNd G (3, Q.size());
  CalcPointJacobian (*model, Q, body_id, contact_point, G, true);

  //	cout << G << endl;

  ClearLogOutput();

  ForwardDynamicsConstraintsDirect (*model, Q, QDot, Tau, constraint_set_left, QDDot);

  //	cout << "C0: " << contact_data_left[0].body_id << ", " << contact_data_left[0].point.transpose() << endl;
  //	cout << "C1: " << contact_data_left[1].body_id << ", " << contact_data_left[1].point.transpose() << endl;
  //	cout << "td: " << foot_left_id << ", " << heel_point.transpose() << endl;

  contact_force[0] = constraint_set_left.force[0];
  contact_force[1] = constraint_set_left.force[1];

  CHECK_EQUAL (body_id, foot_left_id);
  CHECK_EQUAL (contact_point, heel_point);

  //	cout << LogOutput.str() << endl;
  contact_accel_left = CalcPointAcceleration (*model, Q, QDot, QDDot, foot_left_id, heel_point);
  contact_vel_left = CalcPointVelocity (*model, Q, QDot, foot_left_id, heel_point);
  //	cout << contact_force << endl;
  //	cout << contact_accel_left << endl;

  CHECK_ARRAY_CLOSE (Vector3d (0., 0., 0.).data(), contact_accel_left.data(), 3, TEST_PREC);

  delete model;
}

TEST ( TestClearContactsInertiaMatrix ) {
  Model* model = new Model;

  init_model(model);

  Q.resize(model->dof_count);
  QDot.resize(model->dof_count);
  QDDot.resize(model->dof_count);
  Tau.resize(model->dof_count);

  Q[0] = -0.2;
  Q[1] = 0.9;
  Q[2] = 0;
  Q[3] = -0.15;
  Q[4] = -0.15;
  Q[5] = 0.1;
  Q[6] = 0.15;
  Q[7] = -0.15;
  Q[8] = 0;

  QDot.setZero();

  Tau[0] = 0;
  Tau[1] = 0;
  Tau[2] = 0;
  Tau[3] = 1;
  Tau[4] = 1;
  Tau[5] = 1;
  Tau[6] = 1;
  Tau[7] = 1;
  Tau[8] = 1;

  VectorNd QDDot_aba (QDDot);
  VectorNd QDDot_lag (QDDot);

  // initialize matrix with erroneous values
  constraint_set_right.bound = false;
  constraint_set_right.H = MatrixNd::Zero (model->dof_count, model->dof_count);
  for (unsigned int i = 0; i < model->dof_count; i++) {
    for (unsigned int j = 0; j < model->dof_count; j++) {
      constraint_set_right.H(i,j) = 1.234;
    }
  }

  constraint_set_right.Bind (*model);

  ForwardDynamicsConstraintsDirect (*model, Q, QDot, Tau, constraint_set_right, QDDot_lag);
  ForwardDynamicsContactsKokkevis (*model, Q, QDot, Tau, constraint_set_right, QDDot_aba);

  CHECK_ARRAY_CLOSE (QDDot_lag.data(), QDDot_aba.data(), QDDot.size(), TEST_PREC * QDDot_lag.norm());

  delete model;
}