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/////////////////////////////////////////////////////////////////////////////// |
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// BSD 3-Clause License |
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// |
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// Copyright (C) 2021-2025, Heriot-Watt University, University of Edinburgh |
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// Copyright note valid unless otherwise stated in individual files. |
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// All rights reserved. |
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/////////////////////////////////////////////////////////////////////////////// |
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#ifndef CROCODDYL_MULTIBODY_ACTIONS_FREE_INVDYN_HPP_ |
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#define CROCODDYL_MULTIBODY_ACTIONS_FREE_INVDYN_HPP_ |
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#include "crocoddyl/core/actuation-base.hpp" |
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#include "crocoddyl/core/constraints/constraint-manager.hpp" |
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#include "crocoddyl/core/costs/cost-sum.hpp" |
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#include "crocoddyl/core/diff-action-base.hpp" |
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#include "crocoddyl/core/residual-base.hpp" |
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#include "crocoddyl/multibody/data/multibody.hpp" |
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#include "crocoddyl/multibody/fwd.hpp" |
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#include "crocoddyl/multibody/states/multibody.hpp" |
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namespace crocoddyl { |
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/** |
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* @brief Differential action model for free inverse dynamics in multibody |
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* systems. |
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* |
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* This class implements forward kinematic with an inverse-dynamics computed |
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* using the Recursive Newton Euler Algorithm (RNEA). The stack of cost and |
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* constraint functions are implemented in `CostModelSumTpl` and |
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* `ConstraintModelManagerTpl`, respectively. The accelerations are the decision |
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* variables defined as the control inputs, and the under-actuation constraint |
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* is under the name `tau`, thus the user is not allowed to use it. |
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* |
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* |
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* \sa `DifferentialActionModelAbstractTpl`, `calc()`, `calcDiff()`, |
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* `createData()` |
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*/ |
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template <typename _Scalar> |
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class DifferentialActionModelFreeInvDynamicsTpl |
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: public DifferentialActionModelAbstractTpl<_Scalar> { |
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public: |
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
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CROCODDYL_DERIVED_CAST(DifferentialActionModelBase, |
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DifferentialActionModelFreeInvDynamicsTpl) |
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typedef _Scalar Scalar; |
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typedef MathBaseTpl<Scalar> MathBase; |
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typedef DifferentialActionModelAbstractTpl<Scalar> Base; |
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typedef DifferentialActionDataFreeInvDynamicsTpl<Scalar> Data; |
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typedef DifferentialActionDataAbstractTpl<Scalar> |
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DifferentialActionDataAbstract; |
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typedef CostModelSumTpl<Scalar> CostModelSum; |
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typedef ConstraintModelManagerTpl<Scalar> ConstraintModelManager; |
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typedef StateMultibodyTpl<Scalar> StateMultibody; |
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typedef ActuationModelAbstractTpl<Scalar> ActuationModelAbstract; |
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typedef ConstraintModelResidualTpl<Scalar> ConstraintModelResidual; |
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typedef typename MathBase::VectorXs VectorXs; |
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/** |
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* @brief Initialize the free inverse-dynamics action model |
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* |
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* It describes the kinematic evolution of the multibody system and computes |
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* the needed torques using inverse dynamics. |
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* |
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* @param[in] state State of the multibody system |
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* @param[in] actuation Actuation model |
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* @param[in] costs Cost model |
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*/ |
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DifferentialActionModelFreeInvDynamicsTpl( |
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std::shared_ptr<StateMultibody> state, |
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std::shared_ptr<ActuationModelAbstract> actuation, |
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std::shared_ptr<CostModelSum> costs); |
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/** |
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* @brief Initialize the free inverse-dynamics action model |
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* |
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* @param[in] state State of the multibody system |
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* @param[in] actuation Actuation model |
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* @param[in] costs Cost model |
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* @param[in] constraints Constraints model |
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*/ |
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DifferentialActionModelFreeInvDynamicsTpl( |
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std::shared_ptr<StateMultibody> state, |
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std::shared_ptr<ActuationModelAbstract> actuation, |
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std::shared_ptr<CostModelSum> costs, |
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std::shared_ptr<ConstraintModelManager> constraints); |
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virtual ~DifferentialActionModelFreeInvDynamicsTpl() = default; |
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/** |
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* @brief Compute the system acceleration, cost value and constraint residuals |
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* |
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* It extracts the acceleration value from control vector and also computes |
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* the cost and constraints. |
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* |
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* @param[in] data Free inverse-dynamics data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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* @param[in] u Control input \f$\mathbf{u}\in\mathbb{R}^{nu}\f$ |
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*/ |
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virtual void calc(const std::shared_ptr<DifferentialActionDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>& x, |
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const Eigen::Ref<const VectorXs>& u) override; |
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/** |
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* @brief @copydoc Base::calc(const |
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* std::shared_ptr<DifferentialActionDataAbstract>& data, const |
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* Eigen::Ref<const VectorXs>& x) |
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*/ |
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virtual void calc(const std::shared_ptr<DifferentialActionDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>& x) override; |
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/** |
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* @brief Compute the derivatives of the dynamics, cost and constraint |
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* functions |
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* |
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* It computes the partial derivatives of the dynamical system and the cost |
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* and contraint functions. It assumes that `calc()` has been run first. This |
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* function builds a quadratic approximation of the time-continuous action |
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* model (i.e., dynamical system, cost and constraint functions). |
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* |
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* @param[in] data Free inverse-dynamics data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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* @param[in] u Control input \f$\mathbf{u}\in\mathbb{R}^{nu}\f$ |
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*/ |
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virtual void calcDiff( |
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const std::shared_ptr<DifferentialActionDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>& x, |
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const Eigen::Ref<const VectorXs>& u) override; |
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/** |
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* @brief @copydoc Base::calcDiff(const |
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* std::shared_ptr<DifferentialActionDataAbstract>& data, const |
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* Eigen::Ref<const VectorXs>& x) |
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*/ |
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virtual void calcDiff( |
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const std::shared_ptr<DifferentialActionDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>& x) override; |
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/** |
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* @brief Create the free inverse-dynamics data |
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* |
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* @return free inverse-dynamics data |
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*/ |
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virtual std::shared_ptr<DifferentialActionDataAbstract> createData() override; |
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/** |
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* @brief Cast the free-invdyn model to a different scalar type. |
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* |
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* It is useful for operations requiring different precision or scalar types. |
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* |
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* @tparam NewScalar The new scalar type to cast to. |
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* @return DifferentialActionModelFreeInvDynamicsTpl<NewScalar> A |
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* differential-action model with the new scalar type. |
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*/ |
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template <typename NewScalar> |
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DifferentialActionModelFreeInvDynamicsTpl<NewScalar> cast() const; |
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/** |
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* @brief Checks that a specific data belongs to the free inverse-dynamics |
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* model |
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*/ |
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virtual bool checkData( |
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const std::shared_ptr<DifferentialActionDataAbstract>& data) override; |
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/** |
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* @brief Computes the quasic static commands |
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* |
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* The quasic static commands are the ones produced for a reference posture as |
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* an equilibrium point with zero acceleration, i.e., for |
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* \f$\mathbf{f^q_x}\delta\mathbf{q}+\mathbf{f_u}\delta\mathbf{u}=\mathbf{0}\f$ |
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* |
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* @param[in] data Free inverse-dynamics data |
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* @param[out] u Quasic-static commands |
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* @param[in] x State point (velocity has to be zero) |
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* @param[in] maxiter Maximum allowed number of iterations (default 100) |
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* @param[in] tol Tolerance (default 1e-9) |
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*/ |
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virtual void quasiStatic( |
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const std::shared_ptr<DifferentialActionDataAbstract>& data, |
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Eigen::Ref<VectorXs> u, const Eigen::Ref<const VectorXs>& x, |
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const std::size_t maxiter = 100, |
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const Scalar tol = Scalar(1e-9)) override; |
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/** |
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* @brief Return the number of inequality constraints |
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*/ |
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virtual std::size_t get_ng() const override; |
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/** |
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* @brief Return the number of equality constraints |
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*/ |
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virtual std::size_t get_nh() const override; |
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/** |
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* @brief Return the number of equality terminal constraints |
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*/ |
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virtual std::size_t get_ng_T() const override; |
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/** |
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* @brief Return the number of equality terminal constraints |
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*/ |
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virtual std::size_t get_nh_T() const override; |
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/** |
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* @brief Return the lower bound of the inequality constraints |
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*/ |
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virtual const VectorXs& get_g_lb() const override; |
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/** |
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* @brief Return the upper bound of the inequality constraints |
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*/ |
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virtual const VectorXs& get_g_ub() const override; |
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/** |
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* @brief Return the actuation model |
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*/ |
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const std::shared_ptr<ActuationModelAbstract>& get_actuation() const; |
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/** |
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* @brief Return the cost model |
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*/ |
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const std::shared_ptr<CostModelSum>& get_costs() const; |
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/** |
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* @brief Return the constraint model manager |
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*/ |
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const std::shared_ptr<ConstraintModelManager>& get_constraints() const; |
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/** |
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* @brief Return the Pinocchio model |
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*/ |
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pinocchio::ModelTpl<Scalar>& get_pinocchio() const; |
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/** |
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* @brief Print relevant information of the free inverse-dynamics model |
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* |
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* @param[out] os Output stream object |
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*/ |
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virtual void print(std::ostream& os) const override; |
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protected: |
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using Base::g_lb_; //!< Lower bound of the inequality constraints |
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using Base::g_ub_; //!< Upper bound of the inequality constraints |
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using Base::ng_; //!< Number of inequality constraints |
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using Base::nh_; //!< Number of equality constraints |
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using Base::nu_; //!< Control dimension |
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using Base::state_; //!< Model of the state |
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private: |
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void init(const std::shared_ptr<StateMultibody>& state); |
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std::shared_ptr<ActuationModelAbstract> actuation_; //!< Actuation model |
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std::shared_ptr<CostModelSum> costs_; //!< Cost model |
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std::shared_ptr<ConstraintModelManager> constraints_; //!< Constraint model |
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pinocchio::ModelTpl<Scalar>* pinocchio_; //!< Pinocchio model |
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public: |
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/** |
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* @brief Actuation residual |
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* |
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* This residual function enforces the torques of under-actuated joints (e.g., |
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* floating-base joints) to be zero. We compute these torques and their |
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* derivatives using RNEA inside `DifferentialActionModelFreeInvDynamicsTpl`. |
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* |
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* As described in `ResidualModelAbstractTpl`, the residual value and its |
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* Jacobians are calculated by `calc` and `calcDiff`, respectively. |
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* |
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* \sa `ResidualModelAbstractTpl`, `calc()`, `calcDiff()`, `createData()` |
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*/ |
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class ResidualModelActuation : public ResidualModelAbstractTpl<_Scalar> { |
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public: |
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
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CROCODDYL_INNER_DERIVED_CAST(ResidualModelBase, |
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DifferentialActionModelFreeInvDynamicsTpl, |
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ResidualModelActuation) |
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typedef _Scalar Scalar; |
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typedef MathBaseTpl<Scalar> MathBase; |
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typedef ResidualModelAbstractTpl<Scalar> Base; |
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typedef StateMultibodyTpl<Scalar> StateMultibody; |
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typedef ResidualDataAbstractTpl<Scalar> ResidualDataAbstract; |
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typedef DataCollectorAbstractTpl<Scalar> DataCollectorAbstract; |
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typedef ActuationModelAbstractTpl<Scalar> ActuationModelAbstract; |
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typedef typename MathBase::VectorXs VectorXs; |
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typedef typename MathBase::MatrixXs MatrixXs; |
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/** |
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* @brief Initialize the actuation residual model |
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* |
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* @param[in] state State of the multibody system |
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* @param[in] nu Dimension of the joint torques |
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*/ |
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ResidualModelActuation(std::shared_ptr<StateMultibody> state, |
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const std::size_t nu) |
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: Base(state, state->get_nv() - nu, state->get_nv(), true, true, true), |
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na_(nu) {} |
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virtual ~ResidualModelActuation() = default; |
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/** |
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* @brief Compute the actuation residual |
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* |
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* @param[in] data Actuation residual data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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* @param[in] u Control input \f$\mathbf{u}\in\mathbb{R}^{nv+nu}\f$ |
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*/ |
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virtual void calc(const std::shared_ptr<ResidualDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>&, |
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const Eigen::Ref<const VectorXs>&) override { |
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typename Data::ResidualDataActuation* d = |
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static_cast<typename Data::ResidualDataActuation*>(data.get()); |
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// Update the under-actuation set and residual |
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std::size_t nrow = 0; |
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for (std::size_t k = 0; |
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k < static_cast<std::size_t>(d->actuation->tau_set.size()); ++k) { |
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if (!d->actuation->tau_set[k]) { |
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data->r(nrow) = d->pinocchio->tau(k); |
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nrow += 1; |
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} |
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} |
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} |
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/** |
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* @brief @copydoc Base::calc(const std::shared_ptr<ResidualDataAbstract>& |
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* data, const Eigen::Ref<const VectorXs>& x) |
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*/ |
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virtual void calc(const std::shared_ptr<ResidualDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>&) override { |
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data->r.setZero(); |
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} |
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/** |
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* @brief Compute the derivatives of the actuation residual |
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* |
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* @param[in] data Actuation residual data |
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* @param[in] x State point \f$\mathbf{x}\in\mathbb{R}^{ndx}\f$ |
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* @param[in] u Control input \f$\mathbf{u}\in\mathbb{R}^{nu}\f$ |
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*/ |
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virtual void calcDiff(const std::shared_ptr<ResidualDataAbstract>& data, |
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const Eigen::Ref<const VectorXs>&, |
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const Eigen::Ref<const VectorXs>&) override { |
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typename Data::ResidualDataActuation* d = |
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static_cast<typename Data::ResidualDataActuation*>(data.get()); |
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std::size_t nrow = 0; |
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const std::size_t nv = state_->get_nv(); |
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d->dtau_dx.leftCols(nv) = d->pinocchio->dtau_dq; |
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d->dtau_dx.rightCols(nv) = d->pinocchio->dtau_dv; |
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d->dtau_dx -= d->actuation->dtau_dx; |
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for (std::size_t k = 0; |
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k < static_cast<std::size_t>(d->actuation->tau_set.size()); ++k) { |
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if (!d->actuation->tau_set[k]) { |
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d->Rx.row(nrow) = d->dtau_dx.row(k); |
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d->Ru.row(nrow) = d->pinocchio->M.row(k); |
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nrow += 1; |
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} |
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} |
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} |
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/** |
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* @brief @copydoc Base::calcDiff(const |
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* std::shared_ptr<ResidualDataAbstract>& data, const Eigen::Ref<const |
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* VectorXs>& x) |
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*/ |
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✗ |
virtual void calcDiff(const std::shared_ptr<ResidualDataAbstract>& data, |
362 |
|
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const Eigen::Ref<const VectorXs>&) override { |
363 |
|
✗ |
data->Rx.setZero(); |
364 |
|
✗ |
data->Ru.setZero(); |
365 |
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} |
366 |
|
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|
367 |
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/** |
368 |
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* @brief Create the actuation residual data |
369 |
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* |
370 |
|
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* @return Actuation residual data |
371 |
|
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*/ |
372 |
|
✗ |
virtual std::shared_ptr<ResidualDataAbstract> createData( |
373 |
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DataCollectorAbstract* const data) override { |
374 |
|
|
return std::allocate_shared<typename Data::ResidualDataActuation>( |
375 |
|
✗ |
Eigen::aligned_allocator<typename Data::ResidualDataActuation>(), |
376 |
|
✗ |
this, data); |
377 |
|
|
} |
378 |
|
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|
379 |
|
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/** |
380 |
|
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* @brief Cast the actuation-residual model to a different scalar type. |
381 |
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* |
382 |
|
|
* It is useful for operations requiring different precision or scalar |
383 |
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* types. |
384 |
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* |
385 |
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* @tparam NewScalar The new scalar type to cast to. |
386 |
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* @return typename |
387 |
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* DifferentialActionModelFreeInvDynamicsTpl<NewScalar>::ResidualModelActuation |
388 |
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* A residual model with the new scalar type. |
389 |
|
|
*/ |
390 |
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template <typename NewScalar> |
391 |
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typename DifferentialActionModelFreeInvDynamicsTpl< |
392 |
|
|
NewScalar>::ResidualModelActuation |
393 |
|
✗ |
cast() const { |
394 |
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typedef typename DifferentialActionModelFreeInvDynamicsTpl< |
395 |
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NewScalar>::ResidualModelActuation ReturnType; |
396 |
|
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typedef StateMultibodyTpl<NewScalar> StateType; |
397 |
|
✗ |
ReturnType ret(std::static_pointer_cast<StateType>( |
398 |
|
✗ |
state_->template cast<NewScalar>()), |
399 |
|
✗ |
na_); |
400 |
|
✗ |
return ret; |
401 |
|
|
} |
402 |
|
|
|
403 |
|
|
/** |
404 |
|
|
* @brief Print relevant information of the actuation residual model |
405 |
|
|
* |
406 |
|
|
* @param[out] os Output stream object |
407 |
|
|
*/ |
408 |
|
✗ |
virtual void print(std::ostream& os) const override { |
409 |
|
✗ |
os << "ResidualModelActuation {nx=" << state_->get_nx() |
410 |
|
✗ |
<< ", ndx=" << state_->get_ndx() << ", nu=" << nu_ << ", na=" << na_ |
411 |
|
✗ |
<< "}"; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
protected: |
415 |
|
|
std::size_t na_; //!< Dimension of the joint torques |
416 |
|
|
using Base::nu_; |
417 |
|
|
using Base::state_; |
418 |
|
|
}; |
419 |
|
|
}; |
420 |
|
|
|
421 |
|
|
template <typename _Scalar> |
422 |
|
|
struct DifferentialActionDataFreeInvDynamicsTpl |
423 |
|
|
: public DifferentialActionDataAbstractTpl<_Scalar> { |
424 |
|
|
EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
425 |
|
|
typedef _Scalar Scalar; |
426 |
|
|
typedef MathBaseTpl<Scalar> MathBase; |
427 |
|
|
typedef DifferentialActionDataAbstractTpl<Scalar> Base; |
428 |
|
|
typedef JointDataAbstractTpl<Scalar> JointDataAbstract; |
429 |
|
|
typedef DataCollectorJointActMultibodyTpl<Scalar> |
430 |
|
|
DataCollectorJointActMultibody; |
431 |
|
|
typedef CostDataSumTpl<Scalar> CostDataSum; |
432 |
|
|
typedef ConstraintDataManagerTpl<Scalar> ConstraintDataManager; |
433 |
|
|
typedef typename MathBase::VectorXs VectorXs; |
434 |
|
|
|
435 |
|
|
template <template <typename Scalar> class Model> |
436 |
|
✗ |
explicit DifferentialActionDataFreeInvDynamicsTpl(Model<Scalar>* const model) |
437 |
|
|
: Base(model), |
438 |
|
✗ |
pinocchio(pinocchio::DataTpl<Scalar>(model->get_pinocchio())), |
439 |
|
✗ |
multibody( |
440 |
|
✗ |
&pinocchio, model->get_actuation()->createData(), |
441 |
|
|
std::make_shared<JointDataAbstract>( |
442 |
|
✗ |
model->get_state(), model->get_actuation(), model->get_nu())), |
443 |
|
✗ |
costs(model->get_costs()->createData(&multibody)), |
444 |
|
✗ |
constraints(model->get_constraints()->createData(&multibody)), |
445 |
|
✗ |
tmp_xstatic(model->get_state()->get_nx()) { |
446 |
|
✗ |
const std::size_t nv = model->get_state()->get_nv(); |
447 |
|
✗ |
Fu.leftCols(nv).diagonal().setOnes(); |
448 |
|
✗ |
multibody.joint->da_du.leftCols(nv).diagonal().setOnes(); |
449 |
|
✗ |
costs->shareMemory(this); |
450 |
|
✗ |
constraints->shareMemory(this); |
451 |
|
✗ |
tmp_xstatic.setZero(); |
452 |
|
|
} |
453 |
|
✗ |
virtual ~DifferentialActionDataFreeInvDynamicsTpl() = default; |
454 |
|
|
|
455 |
|
|
pinocchio::DataTpl<Scalar> pinocchio; //!< Pinocchio data |
456 |
|
|
DataCollectorJointActMultibody multibody; //!< Multibody data |
457 |
|
|
std::shared_ptr<CostDataSum> costs; //!< Costs data |
458 |
|
|
std::shared_ptr<ConstraintDataManager> constraints; //!< Constraints data |
459 |
|
|
VectorXs |
460 |
|
|
tmp_xstatic; //!< State point used for computing the quasi-static input |
461 |
|
|
using Base::cost; |
462 |
|
|
using Base::Fu; |
463 |
|
|
using Base::Fx; |
464 |
|
|
using Base::Lu; |
465 |
|
|
using Base::Luu; |
466 |
|
|
using Base::Lx; |
467 |
|
|
using Base::Lxu; |
468 |
|
|
using Base::Lxx; |
469 |
|
|
using Base::r; |
470 |
|
|
using Base::xout; |
471 |
|
|
|
472 |
|
|
struct ResidualDataActuation : public ResidualDataAbstractTpl<_Scalar> { |
473 |
|
|
EIGEN_MAKE_ALIGNED_OPERATOR_NEW |
474 |
|
|
|
475 |
|
|
typedef _Scalar Scalar; |
476 |
|
|
typedef MathBaseTpl<Scalar> MathBase; |
477 |
|
|
typedef ResidualDataAbstractTpl<Scalar> Base; |
478 |
|
|
typedef DataCollectorAbstractTpl<Scalar> DataCollectorAbstract; |
479 |
|
|
typedef DataCollectorActMultibodyTpl<Scalar> DataCollectorActMultibody; |
480 |
|
|
typedef ActuationDataAbstractTpl<Scalar> ActuationDataAbstract; |
481 |
|
|
typedef typename MathBase::MatrixXs MatrixXs; |
482 |
|
|
|
483 |
|
|
template <template <typename Scalar> class Model> |
484 |
|
✗ |
ResidualDataActuation(Model<Scalar>* const model, |
485 |
|
|
DataCollectorAbstract* const data) |
486 |
|
|
: Base(model, data), |
487 |
|
✗ |
dtau_dx(model->get_state()->get_nv(), model->get_state()->get_ndx()) { |
488 |
|
✗ |
dtau_dx.setZero(); |
489 |
|
|
// Check that proper shared data has been passed |
490 |
|
✗ |
DataCollectorActMultibody* d = |
491 |
|
✗ |
dynamic_cast<DataCollectorActMultibody*>(shared); |
492 |
|
✗ |
if (d == NULL) { |
493 |
|
✗ |
throw_pretty( |
494 |
|
|
"Invalid argument: the shared data should be derived from " |
495 |
|
|
"DataCollectorActMultibody"); |
496 |
|
|
} |
497 |
|
|
|
498 |
|
|
// Avoids data casting at runtime |
499 |
|
✗ |
pinocchio = d->pinocchio; |
500 |
|
✗ |
actuation = d->actuation; |
501 |
|
|
} |
502 |
|
|
|
503 |
|
|
pinocchio::DataTpl<Scalar>* pinocchio; //!< Pinocchio data |
504 |
|
|
std::shared_ptr<ActuationDataAbstract> actuation; //!< Actuation data |
505 |
|
|
MatrixXs dtau_dx; |
506 |
|
|
using Base::r; |
507 |
|
|
using Base::Ru; |
508 |
|
|
using Base::Rx; |
509 |
|
|
using Base::shared; |
510 |
|
|
}; |
511 |
|
|
}; |
512 |
|
|
|
513 |
|
|
} // namespace crocoddyl |
514 |
|
|
|
515 |
|
|
/* --- Details -------------------------------------------------------------- */ |
516 |
|
|
/* --- Details -------------------------------------------------------------- */ |
517 |
|
|
/* --- Details -------------------------------------------------------------- */ |
518 |
|
|
#include <crocoddyl/multibody/actions/free-invdyn.hxx> |
519 |
|
|
|
520 |
|
|
CROCODDYL_DECLARE_EXTERN_TEMPLATE_CLASS( |
521 |
|
|
crocoddyl::DifferentialActionModelFreeInvDynamicsTpl) |
522 |
|
|
CROCODDYL_DECLARE_EXTERN_TEMPLATE_STRUCT( |
523 |
|
|
crocoddyl::DifferentialActionDataFreeInvDynamicsTpl) |
524 |
|
|
|
525 |
|
|
#endif // CROCODDYL_MULTIBODY_ACTIONS_FREE_INVDYN_HPP_ |
526 |
|
|
|