Template Class ResidualModelContactForceTpl

Defined in File contact-force.hpp

Inheritance Relationships

Base Type

public crocoddyl::ResidualModelAbstractTpl< _Scalar > (Template Class ResidualModelAbstractTpl)

Class Documentation

template<typename _Scalar> class ResidualModelContactForceTpl : public crocoddyl::ResidualModelAbstractTpl<_Scalar>

Define a contact force residual function.

This residual function is defined as \(\mathbf{r}=\boldsymbol{\lambda}-\boldsymbol{\lambda}^*\), where \(\boldsymbol{\lambda}, \boldsymbol{\lambda}^*\) are the current and reference spatial forces, respectively. The current spatial forces \(\boldsymbol{\lambda}\in\mathbb{R}^{nc}\) is computed by DifferentialActionModelContactFwdDynamicsTpl or ActionModelImpulseFwdDynamicTpl, with nc as the dimension of the contact.

Both residual and residual Jacobians are computed analytically, where the force vector \(\boldsymbol{\lambda}\) and its Jacobians \(\left(\frac{\partial\boldsymbol{\lambda}}{\partial\mathbf{x}}, \frac{\partial\boldsymbol{\lambda}}{\partial\mathbf{u}}\right)\) are computed by DifferentialActionModelContactFwdDynamicsTpl or ActionModelImpulseFwdDynamicTpl. These values are stored in a shared data (i.e., DataCollectorContactTpl or DataCollectorImpulseTpl). Note that this residual function cannot be used with other action models.