linearSpring.H

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    Copyright (C) 2011-2013 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
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Class
    Foam::sixDoFRigidBodyMotionRestraints::linearSpring
 
Description
    sixDoFRigidBodyMotionRestraints model.  Linear spring.
 
SourceFiles
    linearSpring.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef linearSpring_H
#define linearSpring_H
 
#include "sixDoFRigidBodyMotionRestraint.H"
#include "point.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
namespace sixDoFRigidBodyMotionRestraints
{
 
/*---------------------------------------------------------------------------*\
                          Class linearSpring Declaration
\*---------------------------------------------------------------------------*/
 
class linearSpring
:
    public sixDoFRigidBodyMotionRestraint
{
    // 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_;
 
 
public:
 
    //- Runtime type information
    TypeName("linearSpring");
 
 
    // Constructors
 
        //- Construct from components
        linearSpring
        (
            const word& name,
            const dictionary& sDoFRBMRDict
        );
 
        //- Construct and return a clone
        virtual autoPtr<sixDoFRigidBodyMotionRestraint> clone() const
        {
            return autoPtr<sixDoFRigidBodyMotionRestraint>
            (
                new linearSpring(*this)
            );
        }
 
 
    //- Destructor
    virtual ~linearSpring();
 
 
    // Member Functions
 
        //- Calculate the restraint position, force and moment.
        //  Global reference frame vectors.
        virtual void restrain
        (
            const sixDoFRigidBodyMotion& motion,
            vector& restraintPosition,
            vector& restraintForce,
            vector& restraintMoment
        ) const;
 
        //- Update properties from given dictionary
        virtual bool read(const dictionary& sDoFRBMRCoeff);
 
        //- Write
        virtual void write(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace solidBodyMotionFunctions
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //