linearSpring.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    You should have received a copy of the GNU General Public License
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Class
    Foam::RBD::restraints::linearSpring
 
Description
    Linear spring restraint.
 
SourceFiles
    linearSpring.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef RBD_restraints_linearSpring_H
#define RBD_restraints_linearSpring_H
 
#include "rigidBodyRestraint.H"
#include "Switch.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace RBD
{
namespace restraints
{
 
/*---------------------------------------------------------------------------*\
                        Class linearSpring Declaration
\*---------------------------------------------------------------------------*/
 
class linearSpring
:
    public restraint
{
    // Private Data
 
        //- Anchor point, where the spring is attached to an immovable
        //  object
        point anchor_;
 
        //- Reference point of attachment to the solid body
        point refAttachmentPt_;
 
        //- Spring stiffness coefficient [N/m]
        scalar stiffness_;
 
        //- Damping coefficient [Ns/m]
        scalar damping_;
 
        //- Rest length - length of spring when no forces are applied to it
        scalar restLength_;
 
        //- Switch to allow no restraint when line is shorter than restLength
        Switch allowSlack_;
 
 
public:
 
    //- Runtime type information
    TypeName("linearSpring");
 
 
    // Constructors
 
        //- Construct from components
        linearSpring
        (
            const word& name,
            const dictionary& dict,
            const rigidBodyModel& model
        );
 
        //- Construct and return a clone
        virtual autoPtr<restraint> clone() const
        {
            return autoPtr<restraint>
            (
                new linearSpring(*this)
            );
        }
 
 
    //- Destructor
    virtual ~linearSpring();
 
 
    // Member Functions
 
        //- Accumulate the retraint internal joint forces into the tau field and
        //  external forces into the fx field
        virtual void restrain
        (
            scalarField& tau,
            Field<spatialVector>& fx,
            const rigidBodyModelState& state
        ) const;
 
        //- Update properties from given dictionary
        virtual bool read(const dictionary& dict);
 
        //- Write
        virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace restraints
} // End namespace RBD
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //