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41 if (restraints_.empty())
48 DebugInfo <<
"Restraint " << restraints_[ri].name();
51 restraints_[ri].restrain(tau, fx, state);
69 <<
"qDot = " << qDot <<
nl
70 <<
"tau = " << tau <<
endl;
77 for (label i=1; i<nBodies(); i++)
79 const joint& jnt = joints()[i];
80 jnt.
jcalc(J, q, qDot);
85 Xlambda_[i] = J.
X & XT_[i];
87 const label lambdai = lambda_[i];
91 X0_[i] = Xlambda_[i] & X0_[lambdai];
98 v_[i] = (Xlambda_[i] & v_[lambdai]) + J.
v;
99 c_[i] = J.
c + (v_[i] ^ J.
v);
101 pA_[i] = v_[i] ^* (
I(i) & v_[i]);
105 pA_[i] -= *X0_[i] & fx[i];
109 for (label i=nBodies()-1; i>0; i--)
111 const joint& jnt = joints()[i];
112 const label qi = jnt.qIndex();
116 U1_[i] = IA_[i] & S1_[i];
117 Dinv_[i].xx() = 1/(S1_[i] && U1_[i]);
118 u_[i].x() = tau[qi] - (S1_[i] && pA_[i]);
120 const label lambdai = lambda_[i];
126 IA_[i] - (U1_[i]*(Dinv_[i].xx()*U1_[i]))
131 pA_[i] + (Ia & c_[i]) + U1_[i]*(Dinv_[i].xx()*u_[i].
x())
139 pA_[lambdai] += Xlambda_[i].T() & pa;
144 U_[i] = IA_[i] & S_[i];
145 Dinv_[i] = (S_[i].T() & U_[i]).
inv();
149 const label lambdai = lambda_[i];
156 - (U_[i] & Dinv_[i] & U_[i].
T())
163 + (U_[i] & Dinv_[i] & u_[i])
171 pA_[lambdai] += Xlambda_[i].T() & pa;
178 for (label i=1; i<nBodies(); i++)
180 const joint& jnt = joints()[i];
181 const label qi = jnt.qIndex();
183 a_[i] = (Xlambda_[i] & a_[lambda_[i]]) + c_[i];
187 qDdot[qi] = Dinv_[i].xx()*(u_[i].x() - (U1_[i] && a_[i]));
188 a_[i] += S1_[i]*qDdot[qi];
192 vector qDdoti(Dinv_[i] & (u_[i] - (U_[i].
T() & a_[i])));
195 qDdot[qi] = qDdoti.
x();
196 qDdot[qi+1] = qDdoti.
y();
197 qDdot[qi+2] = qDdoti.
z();
199 a_[i] += (S_[i] & qDdoti);
204 <<
"qDdot = " << qDdot <<
nl
205 <<
"a = " << a_ <<
endl;
226 for (label i=1; i<nBodies(); i++)
228 const joint& jnt = joints()[i];
229 const label qi = jnt.qIndex();
231 jnt.
jcalc(J, q, qDot);
236 Xlambda_[i] = J.
X & XT_[i];
238 const label lambdai = lambda_[i];
242 X0_[i] = Xlambda_[i] & X0_[lambdai];
246 X0_[i] = Xlambda_[i];
249 v_[i] = (Xlambda_[i] & v_[lambdai]) + J.
v;
250 c_[i] = J.
c + (v_[i] ^ J.
v);
251 a_[i] = (Xlambda_[i] & a_[lambdai]) + c_[i];
255 a_[i] += S1_[i]*qDdot[qi];
const Cmpt & x() const
Access to the vector x component.
Holds the motion state of rigid-body model.
label nDoF() const
Return the number of degrees of freedom in this joint.
const scalarField & qDdot() const
Return access to the joint acceleration.
static constexpr const zero Zero
Global zero (0)
Ostream & endl(Ostream &os)
Add newline and flush stream.
Templated 3D spatial tensor derived from MatrixSpace used to represent transformations of spatial vec...
const Cmpt & z() const
Access to the vector z component.
Joint state returned by jcalc.
const scalarField & qDot() const
Return access to the joint velocity.
#define forAll(list, i)
Loop across all elements in list.
spatialVector c
The constrained joint acceleration correction.
void forwardDynamicsCorrection(const rigidBodyModelState &state) const
Correct the velocity and acceleration of the bodies in the model.
dimensionedSphericalTensor inv(const dimensionedSphericalTensor &dt)
#define DebugInFunction
Report an information message using Foam::Info.
spatialTransform X
The joint transformation.
const scalarField & q() const
Return access to the joint position and orientation.
void forwardDynamics(rigidBodyModelState &state, const scalarField &tau, const Field< spatialVector > &fx) const
Calculate the joint acceleration qDdot from the joint state q,.
const Cmpt & y() const
Access to the vector y component.
#define DebugInfo
Report an information message using Foam::Info.
SpatialTensor< scalar > spatialTensor
SpatialTensor of scalars.
void applyRestraints(scalarField &tau, Field< spatialVector > &fx, const rigidBodyModelState &state) const
Apply the restraints and accumulate the internal joint forces.
VSForm block(const label start) const
Abstract base-class for all rigid-body joints.
SpatialVector< scalar > spatialVector
SpatialVector of scalars.
virtual void jcalc(XSvc &J, const scalarField &q, const scalarField &qDot) const =0
Update the rigidBodyModel state for the joint given.
spatialVector S1
The joint motion sub-space (1-DoF)
compactSpatialTensor S
The joint motion sub-space (3-DoF)
spatialVector v
The constrained joint velocity.
static const Identity< scalar > I