multicopter-base.hpp

// BSD 3-Clause License
//
// Copyright (C) 2019-2021, LAAS-CNRS, IRI: CSIC-UPC, University of Edinburgh
// Copyright note valid unless otherwise stated in individual files.
// All rights reserved.
 
#ifndef CROCODDYL_MULTIBODY_ACTUATIONS_MULTICOPTER_BASE_HPP_
#define CROCODDYL_MULTIBODY_ACTUATIONS_MULTICOPTER_BASE_HPP_
 
#include <iostream>
#include "crocoddyl/multibody/fwd.hpp"
#include "crocoddyl/core/utils/exception.hpp"
#include "crocoddyl/core/actuation-base.hpp"
#include "crocoddyl/multibody/states/multibody.hpp"
#include "crocoddyl/core/utils/deprecate.hpp"
 
namespace crocoddyl {
 
template <typename _Scalar>
class ActuationModelMultiCopterBaseTpl : public ActuationModelAbstractTpl<_Scalar> {
 public:
  typedef _Scalar Scalar;
  typedef MathBaseTpl<Scalar> MathBase;
  typedef ActuationModelAbstractTpl<Scalar> Base;
  typedef ActuationDataAbstractTpl<Scalar> Data;
  typedef StateMultibodyTpl<Scalar> StateMultibody;
  typedef typename MathBase::VectorXs VectorXs;
  typedef typename MathBase::MatrixXs MatrixXs;
  typedef typename MathBase::Matrix6xs Matrix6xs;
 
  ActuationModelMultiCopterBaseTpl(boost::shared_ptr<StateMultibody> state, const Eigen::Ref<const Matrix6xs>& tau_f)
      : Base(state, state->get_nv() - 6 + tau_f.cols()), n_rotors_(tau_f.cols()) {
    pinocchio::JointModelFreeFlyerTpl<Scalar> ff_joint;
    if (state->get_pinocchio()->joints[1].shortname() != ff_joint.shortname()) {
      throw_pretty("Invalid argument: "
                   << "the first joint has to be free-flyer");
    }
 
    tau_f_ = MatrixXs::Zero(state_->get_nv(), nu_);
    tau_f_.block(0, 0, 6, n_rotors_) = tau_f;
    if (nu_ > n_rotors_) {
      tau_f_.bottomRightCorner(nu_ - n_rotors_, nu_ - n_rotors_).diagonal().setOnes();
    }
  }
 
  DEPRECATED("Use constructor without n_rotors",
             ActuationModelMultiCopterBaseTpl(boost::shared_ptr<StateMultibody> state, const std::size_t n_rotors,
                                              const Eigen::Ref<const Matrix6xs>& tau_f));
  virtual ~ActuationModelMultiCopterBaseTpl() {}
 
  virtual void calc(const boost::shared_ptr<Data>& data, const Eigen::Ref<const VectorXs>&,
                    const Eigen::Ref<const VectorXs>& u) {
    if (static_cast<std::size_t>(u.size()) != nu_) {
      throw_pretty("Invalid argument: "
                   << "u has wrong dimension (it should be " + std::to_string(nu_) + ")");
    }
 
    data->tau.noalias() = tau_f_ * u;
  }
 
#ifndef NDEBUG
  virtual void calcDiff(const boost::shared_ptr<Data>& data, const Eigen::Ref<const VectorXs>&,
                        const Eigen::Ref<const VectorXs>&) {
#else
  virtual void calcDiff(const boost::shared_ptr<Data>&, const Eigen::Ref<const VectorXs>&,
                        const Eigen::Ref<const VectorXs>&) {
#endif
    // The derivatives has constant values which were set in createData.
    assert_pretty(MatrixXs(data->dtau_du).isApprox(tau_f_), "dtau_du has wrong value");
  }
 
  boost::shared_ptr<Data> createData() {
    boost::shared_ptr<Data> data = boost::allocate_shared<Data>(Eigen::aligned_allocator<Data>(), this);
    data->dtau_du = tau_f_;
    return data;
  }
 
  std::size_t get_nrotors() const { return n_rotors_; };
  const MatrixXs& get_tauf() const { return tau_f_; };
  void set_tauf(const Eigen::Ref<const MatrixXs>& tau_f) { tau_f_ = tau_f; }
 
 protected:
  // Specific of multicopter
  MatrixXs tau_f_;  // Matrix from rotors thrust to body force/moments
  std::size_t n_rotors_;
 
  using Base::nu_;
  using Base::state_;
};
 
template <typename Scalar>
ActuationModelMultiCopterBaseTpl<Scalar>::ActuationModelMultiCopterBaseTpl(boost::shared_ptr<StateMultibody> state,
                                                                           const std::size_t n_rotors,
                                                                           const Eigen::Ref<const Matrix6xs>& tau_f)
    : Base(state, state->get_nv() - 6 + n_rotors), n_rotors_(n_rotors) {
  pinocchio::JointModelFreeFlyerTpl<Scalar> ff_joint;
  if (state->get_pinocchio()->joints[1].shortname() != ff_joint.shortname()) {
    throw_pretty("Invalid argument: "
                 << "the first joint has to be free-flyer");
  }
 
  tau_f_ = MatrixXs::Zero(state_->get_nv(), nu_);
  tau_f_.block(0, 0, 6, n_rotors_) = tau_f;
  if (nu_ > n_rotors_) {
    tau_f_.bottomRightCorner(nu_ - n_rotors_, nu_ - n_rotors_).diagonal().setOnes();
  }
  std::cerr << "Deprecated ActuationModelMultiCopterBase: Use constructor without n_rotors." << std::endl;
}
 
}  // namespace crocoddyl
 
#endif  // CROCODDYL_MULTIBODY_ACTUATIONS_MULTICOPTER_BASE_HPP_