WOLFRAM SYSTEM MODELER

TransformationMatrices

Functions for transformation matrices

Package Contents

Orientation

Orientation type defining rotation from a frame 1 into a frame 2 with a transformation matrix

der_Orientation (1/s)

New type defining the first time derivative of Orientation

orientationConstraint

Return residues of orientation constraints (shall be zero)

angularVelocity1

Return angular velocity resolved in frame 1 from orientation object and its derivative

angularVelocity2

Return angular velocity resolved in frame 2 from orientation object and its derivative

resolve1

Transform vector from frame 2 to frame 1

resolve2

Transform vector from frame 1 to frame 2

multipleResolve1

Transform several vectors from frame 2 to frame 1

multipleResolve2

Transform several vectors from frame 1 to frame 2

resolveDyade1

Transform second order tensor from frame 2 to frame 1

resolveDyade2

Transform second order tensor from frame 1 to frame 2

nullRotation

Return orientation object that does not rotate a frame

inverseRotation

Return inverse orientation object

relativeRotation

Return relative orientation object

absoluteRotation

Return absolute orientation object from another absolute and a relative orientation object

planarRotation

Return orientation object of a planar rotation

planarRotationAngle

Return angle of a planar rotation, given the rotation axis and the representations of a vector in frame 1 and frame 2

axisRotation

Return rotation object to rotate around one frame axis

axesRotations

Return rotation object to rotate in sequence around 3 axes

axesRotationsAngles

Return the 3 angles to rotate in sequence around 3 axes to construct the given orientation object

smallRotation

Return rotation angles valid for a small rotation and optionally residues that should be zero

from_nxy

Return orientation object from n_x and n_y vectors

from_nxz

Return orientation object from n_x and n_z vectors

from_T

Return orientation object R from transformation matrix T

from_T_inv

Return orientation object R from inverse transformation matrix T_inv

from_Q

Return orientation object T from quaternion orientation object Q

to_T

Return transformation matrix T from orientation object R

to_T_inv

Return inverse transformation matrix T_inv from orientation object R

to_Q

Return quaternion orientation object Q from orientation object T

to_vector

Map rotation object into vector

to_exy

Map rotation object into e_x and e_y vectors of frame 2, resolved in frame 1

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Package Frames.TransformationMatrices contains type definitions and functions to transform rotational frame quantities using transformation matrices.

Content

In the table below an example is given for every function definition. The used variables have the following declaration:

Orientation T, T1, T2, T_rel, T_inv;
Real[3]     v1, v2, w1, w2, n_x, n_y, n_z, e, e_x, res_ori, phi;
Real[6]     res_equal;
Real        L, angle;
Function/typeDescription
Orientation T; New type defining an orientation object that describes
the rotation of frame 1 into frame 2.
der_Orientation der_T; New type defining the first time derivative of Frames.Orientation.
res_ori = orientationConstraint(T); Return the constraints between the variables of an orientation object
(shall be zero).
w1 = angularVelocity1(T, der_T); Return angular velocity resolved in frame 1 from orientation object T
and its derivative der_T.
w2 = angularVelocity2(T, der_T); Return angular velocity resolved in frame 2 from orientation object T
and its derivative der_T.
v1 = resolve1(T,v2); Transform vector v2 from frame 2 to frame 1.
v2 = resolve2(T,v1); Transform vector v1 from frame 1 to frame 2.
[v1,w1] = multipleResolve1(T, [v2,w2]); Transform several vectors from frame 2 to frame 1.
[v2,w2] = multipleResolve2(T, [v1,w1]); Transform several vectors from frame 1 to frame 2.
D1 = resolveDyade1(T,D2); Transform second order tensor D2 from frame 2 to frame 1.
D2 = resolveDyade2(T,D1); Transform second order tensor D1 from frame 1 to frame 2.
T= nullRotation() Return orientation object T that does not rotate a frame.
T_inv = inverseRotation(T); Return inverse orientation object.
T_rel = relativeRotation(T1,T2); Return relative orientation object from two absolute orientation objects.
T2 = absoluteRotation(T1,T_rel); Return absolute orientation object from another absolute
and a relative orientation object.
T = planarRotation(e, angle); Return orientation object of a planar rotation.
angle = planarRotationAngle(e, v1, v2); Return angle of a planar rotation, given the rotation axis
and the representations of a vector in frame 1 and frame 2.
T = axisRotation(i, angle); Return orientation object T for rotation around axis i of frame 1.
T = axesRotations(sequence, angles); Return rotation object to rotate in sequence around 3 axes. Example:
T = axesRotations({1,2,3},{90,45,-90});
angles = axesRotationsAngles(T, sequence); Return the 3 angles to rotate in sequence around 3 axes to
construct the given orientation object.
phi = smallRotation(T); Return rotation angles phi valid for a small rotation.
T = from_nxy(n_x, n_y); Return orientation object from n_x and n_y vectors.
T = from_nxz(n_x, n_z); Return orientation object from n_x and n_z vectors.
R = from_T(T); Return orientation object R from transformation matrix T.
R = from_T_inv(T_inv); Return orientation object R from inverse transformation matrix T_inv.
T = from_Q(Q); Return orientation object T from quaternion orientation object Q.
T = to_T(R); Return transformation matrix T from orientation object R.
T_inv = to_T_inv(R); Return inverse transformation matrix T_inv from orientation object R.
Q = to_Q(T); Return quaternion orientation object Q from orientation object T.
exy = to_exy(T); Return [e_x, e_y] matrix of an orientation object T,
with e_x and e_y vectors of frame 2, resolved in frame 1.

Wolfram Language

In[1]:=
SystemModel["Modelica.Mechanics.MultiBody.Frames.TransformationMatrices"]
Out[1]:=