hydrodynamic_plain_bearing_force.h

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#ifndef ___HYDRODYNAMIC_PLAIN_BEARING_H__INCLUDED___
#define ___HYDRODYNAMIC_PLAIN_BEARING_H__INCLUDED___

#include <ac/f2c.h>

#ifdef __cplusplus
extern "C" 
{
#endif
        
static const int NBDIRSMAX = 6;

    struct bearing_data
    {
        doublereal b, d, Psi, eta, eps_max, s, a[9];
    };

    void hydrodynamic_plain_bearing_init(bearing_data& bdat);
    
// computes the hydrodynamic bearing force at the bearing
        
    void hydrodynamic_plain_bearing_force(const bearing_data& bdat,
                                        const doublereal omega[2], 
                                        const doublereal e[2], 
                                        const doublereal e_dot[2], 
                                        doublereal k[3],        
                                        doublereal &eps,
                                        doublereal &eps_dot,
                                        doublereal& delta,
                                        doublereal& SoD,
                                        doublereal& SoV,
                                        doublereal& my,
                                          doublereal& beta);
                                        
// computes the hydrodynamic stiffness matrix and damping matrix at the bearing side

    void hydrodynamic_plain_bearing_force_dv(const bearing_data& bdat,
                                                const doublereal omega[2],
                                                const doublereal omegad[2][NBDIRSMAX],
                                                const doublereal e[2], 
                                                const doublereal ed[2][NBDIRSMAX],
                                                const doublereal e_dot[2], 
                                                const doublereal e_dotd[2][NBDIRSMAX],
                                                doublereal k[3],
                                                doublereal kd[3][NBDIRSMAX], 
                                                doublereal& eps, 
                                                doublereal& eps_dot, 
                                                doublereal& delta, 
                                                doublereal& SoD, 
                                                doublereal& SoV, 
                                                doublereal& my, 
                                                doublereal& beta,
                                                const int& nbdirs);

#ifdef __cplusplus
} // extern "C"
#endif
                                                                                                
#endif