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

#include "rbdl_tests.h"

#include <iostream>

#include "rbdl/Logging.h"

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

#include "Fixtures.h"

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

const double TEST_PREC = 1.0e-14;

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointSimple", "") {
  QDDot[0] = 1.;
  ref_body_id = body_a_id;
  point_position = Vector3d (1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  // cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (0., 1., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  // LOG << "Point accel = " << point_acceleration << endl;
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointSimpleRotated", "") {
  Q[0] = 0.5 * M_PI;

  ref_body_id = body_a_id;
  QDDot[0] = 1.;
  point_position = Vector3d (1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  //	cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (-1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  // LOG << "Point accel = " << point_acceleration << endl;
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointRotation", "") {
  ref_body_id = 1;
  QDot[0] = 1.;
  point_position = Vector3d (1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  //	cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (-1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  ClearLogOutput();

  // if we are on the other side we should have the opposite value
  point_position = Vector3d (-1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  //	cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointRotatedBaseSimple", "") {
  // rotated first joint

  ref_body_id = 1;
  Q[0] = M_PI * 0.5;
  QDot[0] = 1.;
  point_position = Vector3d (1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  REQUIRE_THAT(Vector3d (0., -1., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  point_position = Vector3d (-1., 0., 0.);
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  REQUIRE_THAT(Vector3d (0., 1., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  //	cout << LogOutput.str() << endl;
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointRotatingBodyB", "") {
  // rotating second joint, point at third body

  ref_body_id = 3;
  QDot[1] = 1.;
  point_position = Vector3d (1., 0., 0.); 
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  // cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (-1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 

  // move it a bit further up (acceleration should stay the same)
  point_position = Vector3d (1., 1., 0.); 
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  // cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (-1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC)); 
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointBodyOrigin", "") {
  // rotating second joint, point at third body

  QDot[0] = 1.;

  ref_body_id = body_b_id;
  point_position = Vector3d (0., 0., 0.); 
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, ref_body_id, point_position);

  // cout << LogOutput.str() << endl;

  REQUIRE_THAT(Vector3d (-1., 0., 0.), AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC )); 
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestAccelerationLinearFuncOfQddot", "") {
  // rotating second joint, point at third body

  QDot[0] = 1.1;
  QDot[1] = 1.3;
  QDot[2] = 1.5;

  ref_body_id = body_c_id;
  point_position = Vector3d (1., 1., 1.); 

  VectorNd qddot_1 = VectorNd::Zero (model->dof_count);
  VectorNd qddot_2 = VectorNd::Zero (model->dof_count);
  VectorNd qddot_0 = VectorNd::Zero (model->dof_count);

  qddot_1[0] = 0.1;
  qddot_1[1] = 0.2;
  qddot_1[2] = 0.3;

  qddot_2[0] = 0.32;
  qddot_2[1] = -0.1;
  qddot_2[2] = 0.53;

  Vector3d acc_1 = CalcPointAcceleration(*model, Q, QDot, qddot_1, ref_body_id, point_position);
  Vector3d acc_2 = CalcPointAcceleration(*model, Q, QDot, qddot_2, ref_body_id, point_position);

  MatrixNd G = MatrixNd::Zero (3, model->dof_count);
  CalcPointJacobian (*model, Q, ref_body_id, point_position, G, true);

  VectorNd net_acc = G * (qddot_1 - qddot_2);

  Vector3d acc_new = acc_1 - acc_2;

  REQUIRE_THAT(net_acc,AllCloseVector(acc_new, TEST_PREC, TEST_PREC));
}

 TEST_CASE_METHOD (FloatingBase12DoF, __FILE__"_TestAccelerationFloatingBaseWithUpdateKinematics", "") {
  ForwardDynamics (*model, Q, QDot, Tau, QDDot);

  ClearLogOutput();
  Vector3d accel = CalcPointAcceleration (*model, Q, QDot, QDDot, child_2_rot_x_id, Vector3d (0., 0., 0.), true);

  REQUIRE_THAT (Vector3d (0., -9.81, 0.), AllCloseVector(accel, TEST_PREC, TEST_PREC));
}

 TEST_CASE_METHOD (FloatingBase12DoF, __FILE__"_TestAccelerationFloatingBaseWithoutUpdateKinematics", "") {
  ForwardDynamics (*model, Q, QDot, Tau, QDDot);

  //ClearLogOutput();
  Vector3d accel = CalcPointAcceleration (*model, Q, QDot, QDDot, child_2_rot_x_id, Vector3d (0., 0., 0.), false);

  REQUIRE_THAT (Vector3d (0., 0., 0.), AllCloseVector(accel, TEST_PREC, TEST_PREC));
  //	cout << LogOutput.str() << endl;
  //	cout << accel.transpose() << endl;
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointRotationFixedJoint", "") {
  Body fixed_body(1., Vector3d (1., 0.4, 0.4), Vector3d (1., 1., 1.));
  unsigned int fixed_body_id = model->AddBody (body_c_id, Xtrans (Vector3d (1., -1., 0.)), Joint(JointTypeFixed), fixed_body, "fixed_body");

  QDot[0] = 1.;
  point_position = Vector3d (0., 0., 0.);
  Vector3d point_acceleration_reference = CalcPointAcceleration (*model, Q, QDot, QDDot, body_c_id, Vector3d (1., -1., 0.));

  ClearLogOutput();
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, fixed_body_id, point_position);
  //	cout << LogOutput.str() << endl;

  REQUIRE_THAT (point_acceleration_reference, AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC));
}

 TEST_CASE_METHOD (FixedBase3DoF, __FILE__"_TestCalcPointRotationFixedJointRotatedTransform", "") {
  Body fixed_body(1., Vector3d (1., 0.4, 0.4), Vector3d (1., 1., 1.));

  SpatialTransform fixed_transform = Xtrans (Vector3d (1., -1., 0.)) * Xrotz(M_PI * 0.5);
  unsigned int fixed_body_id = model->AddBody (body_c_id, fixed_transform, Joint(JointTypeFixed), fixed_body, "fixed_body");

  QDot[0] = 1.;
  point_position = Vector3d (0., 0., 0.);
  ClearLogOutput();
  Vector3d point_acceleration_reference = CalcPointAcceleration (*model, Q, QDot, QDDot, body_c_id, Vector3d (1., 1., 0.));
  // cout << LogOutput.str() << endl;

  // cout << "Point position = " << CalcBodyToBaseCoordinates (*model, Q, fixed_body_id, Vector3d (0., 0., 0.)).transpose() << endl;
  // cout << "Point position_ref = " << CalcBodyToBaseCoordinates (*model, Q, body_c_id, Vector3d (1., 1., 0.)).transpose() << endl;

  ClearLogOutput();
  point_acceleration = CalcPointAcceleration(*model, Q, QDot, QDDot, fixed_body_id, point_position);
  // cout << LogOutput.str() << endl;

  REQUIRE_THAT (point_acceleration_reference, AllCloseVector(point_acceleration, TEST_PREC, TEST_PREC));
}