MATLAB SIMMECHANICS 3 - VISUALIZATION AND IMPORT GUIDE Manual de usuario Pagina 25

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Multibody Modeling Workflow
Assemble Multib
ody Model
Once you have cre
ated the rigid body subsystems, you can assemble the
subsystems into
a mechanism or machine. In a m echanism or machine, joints
and constraint
s provide well-defined degrees of freedom that constrain rigid
body motion. Tw
o types of motion are po ssible:
Rotation abou
toneormoreaxes
Translation a
longoneormoreaxes
Connect Joints
To assemble
rigid b ody subsystems into complete multibody systems, connect
the with joi
nts. SimMechanics provides a library with fourteen joint blocks.
Each block p
rovides a different number and/or type of mechanical degrees o f
freedom. E
xactly two rigid body fram es connect to each joint, with each frame
belonging
to a different rigid body.
Joints ar
e com po sed of joint primitives elementary joints that you can
combine t
o create more complex joints. SimMechanics contains three joint
primitiv
es:
Prismat
ic one translational degree of freedom along an axis
Revolut
e one rotational degree of freedom about an axis
Spheri
cal three concurrent degrees of freedom about three axes
The fol
lowing table identifies the joint primitives associated with each joint.
Prismatic Primitives
0
1
23
0
Weld Joint Prismatic
Joint
Rectangular
Joint
Cart
esian
Joi
nt
1
Revolute
Joint
Cyl
indrical
Joi
nt
Planar
Joint
Revolute
Primitives
1-21
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