Description
Base interface for structural damping of beam sections of Cosserat type, where xyz force "n" and xyz torque "m" are a 6-dimensional function of generalized strain speeds, "e'" traction/shear speed and "k'" curvature speed, as: {n,m}=f({e',k'}) Children classes implement this function in different ways.
#include <ChBeamSectionCosserat.h>
Public Member Functions | |
| virtual void | ComputeStress (ChVector<> &stress_n, ChVector<> &stress_m, const ChVector<> &dstrain_e, const ChVector<> &dstrain_k)=0 |
| Compute the generalized cut force and cut torque, caused by structural damping, given actual deformation speed and curvature speed. More... | |
| virtual void | ComputeDampingMatrix (ChMatrixDynamic<> &R, const ChVector<> &dstrain_e, const ChVector<> &dstrain_k) |
| Compute the 6x6 tangent material damping matrix, ie the jacobian [Rm]=dstress/dstrainspeed. More... | |
| virtual void | SetAsRectangularSection (double width_y, double width_z)=0 |
| Shortcut: set parameters at once, given the y and z widths of the beam assumed with rectangular shape. | |
| virtual void | SetAsCircularSection (double diameter)=0 |
| Shortcut: set parameters at once, given the diameter of the beam assumed with circular shape. | |
Public Attributes | |
| ChBeamSectionCosserat * | section |
Member Function Documentation
◆ ComputeDampingMatrix()
|
virtual |
Compute the 6x6 tangent material damping matrix, ie the jacobian [Rm]=dstress/dstrainspeed.
This must be overridden by subclasses if an analytical solution is known (preferred for high performance), otherwise the base behaviour here is to compute [Rm] by numerical differentiation calling ComputeStress() multiple times.
- Parameters
-
R 6x6 material stiffness matrix values here dstrain_e current strain speed (deformation part) dstrain_k current strain speed (curvature part)
Reimplemented in chrono::fea::ChDampingCosseratLinear.
◆ ComputeStress()
|
pure virtual |
Compute the generalized cut force and cut torque, caused by structural damping, given actual deformation speed and curvature speed.
This MUST be implemented by subclasses.
- Parameters
-
stress_n local stress (generalized force), x component = traction along beam stress_m local stress (generalized torque), x component = torsion torque along beam dstrain_e local strain speed (deformation); x elongation speed; y,z shear speeds dstrain_k local strain speed (curvature); x torsion speed; y, z line curvature speeds
Implemented in chrono::fea::ChDampingCosseratLinear.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/fea/ChBeamSectionCosserat.h
- /builds/uwsbel/chrono/src/chrono/fea/ChBeamSectionCosserat.cpp
