Description
Class for all elements whose stiffness matrix can be seen as a NxN block-matrix to be splitted between N nodes.
Helps reducing the complexity of inherited FEA elements because it implements some bookkeeping for the interface with solver. This means that most FEA elements inherited from ChElementGeneric need to implement at most the following two fundamental methods: ComputeKRMmatricesGlobal(), ComputeInternalForces()
#include <ChElementGeneric.h>
Public Member Functions | |
| ChKblockGeneric & | Kstiffness () |
| Access the proxy to stiffness, for sparse solver. | |
| virtual void | EleIntLoadResidual_F (ChVectorDynamic<> &R, const double c) override |
| (This is a default (a bit unoptimal) book keeping so that in children classes you can avoid implementing this EleIntLoadResidual_F function, unless you need faster code) | |
| virtual void | EleIntLoadResidual_Mv (ChVectorDynamic<> &R, const ChVectorDynamic<> &w, const double c) override |
| (This is a default (VERY UNOPTIMAL) book keeping so that in children classes you can avoid implementing this EleIntLoadResidual_Mv function, unless you need faster code.) | |
| virtual void | ComputeMmatrixGlobal (ChMatrixRef M) override |
| Returns the global mass matrix. More... | |
| virtual void | InjectKRMmatrices (ChSystemDescriptor &mdescriptor) override |
| Tell to a system descriptor that there are item(s) of type ChKblock in this object (for further passing it to a solver) | |
| virtual void | KRMmatricesLoad (double Kfactor, double Rfactor, double Mfactor) override |
| Adds the current stiffness K and damping R and mass M matrices in encapsulated ChKblock item(s), if any. More... | |
| virtual void | VariablesFbLoadInternalForces (double factor=1.) override |
| Adds the internal forces, expressed as nodal forces, into the encapsulated ChVariables, in the 'fb' part: qf+=forces*factor (This is a default (a bit unoptimal) book keeping so that in children classes you can avoid implementing this VariablesFbLoadInternalForces function, unless you need faster code) | |
| virtual void | VariablesFbIncrementMq () override |
| Adds M*q (internal masses multiplied current 'qb') to Fb, ex. More... | |
 Public Member Functions inherited from chrono::fea::ChElementBase | |
| virtual int | GetNnodes ()=0 |
| Gets the number of nodes used by this element. | |
| virtual int | GetNdofs ()=0 |
| Gets the number of coordinates in the field used by the referenced nodes. More... | |
| virtual int | GetNodeNdofs (int n)=0 |
| Get the number of coordinates from the n-th node that are used by this element. More... | |
| virtual std::shared_ptr< ChNodeFEAbase > | GetNodeN (int n)=0 |
| Access the nth node. | |
| virtual void | GetStateBlock (ChVectorDynamic<> &mD)=0 |
| Fills the D vector with the current field values at the nodes of the element, with proper ordering. More... | |
| virtual void | ComputeNodalMass () |
| Compute element's nodal masses. | |
| virtual void | ComputeKRMmatricesGlobal (ChMatrixRef H, double Kfactor, double Rfactor=0, double Mfactor=0)=0 |
| Sets H as the stiffness matrix K, scaled by Kfactor. More... | |
| virtual void | ComputeInternalForces (ChVectorDynamic<> &Fi)=0 |
| Computes the internal forces (ex. More... | |
| virtual void | Update () |
| Update: this is called at least at each time step. More... | |
| virtual void | EleDoIntegration () |
| This is optionally implemented if there is some internal state that requires integration. | |
Protected Attributes | |
| ChKblockGeneric | Kmatr |
Member Function Documentation
◆ ComputeMmatrixGlobal()
|
inlineoverridevirtual |
Returns the global mass matrix.
This is the default implementation, POTENTIALLY VERY INEFFICIENT. Children classes may need to override this with a more efficient version.
Implements chrono::fea::ChElementBase.
Reimplemented in chrono::fea::ChElementShellReissner4, chrono::fea::ChElementShellANCF_8, chrono::fea::ChElementShellANCF, chrono::fea::ChElementBeamANCF, and chrono::fea::ChElementCableANCF.
◆ KRMmatricesLoad()
|
inlineoverridevirtual |
Adds the current stiffness K and damping R and mass M matrices in encapsulated ChKblock item(s), if any.
The K, R, M matrices are load with scaling values Kfactor, Rfactor, Mfactor.
Implements chrono::fea::ChElementBase.
◆ VariablesFbIncrementMq()
|
overridevirtual |
Adds M*q (internal masses multiplied current 'qb') to Fb, ex.
if qb is initialized with v_old using VariablesQbLoadSpeed, this method can be used in timestepping schemes that do: M*v_new = M*v_old + forces*dt (This is a default (VERY UNOPTIMAL) book keeping so that in children classes you can avoid implementing this VariablesFbIncrementMq function, unless you need faster code.)
Reimplemented from chrono::fea::ChElementBase.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/fea/ChElementGeneric.h
- /builds/uwsbel/chrono/src/chrono/fea/ChElementGeneric.cpp
