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/FRAME/MOV

/FRAME/MOV

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/FRAME/MOV

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Block Format Keyword

/FRAME/MOV - Moving Frames

Description

Describes moving frames. Relative motion with respect to a reference frame.

Format

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/FRAME/MOV/frame_ID

frame_title

node_ID1

node_ID2

node_ID3

 

 

 

 

 

 

 

hmtoggle_plus1Flag Definition

Field

Contents

frame_ID

Reference frame identifier - must be different from all skew identifiers.

(Integer, maximum 10 digits)

frame_title

Reference frame title

(Character, maximum 100 characters)

node_ID1

Node identifier N1

(Integer)

node_ID2

Node identifier N2

(Integer)

node_ID3

Node identifier N3

(Integer)

hmtoggle_plus1Comments
1.Let a moving reference frame symbol_vt(A,u,v,w).
2.For each time t, the frame position and orientation are determined via its original position xA and a rotation (orientation) matrix R.
3.Let w be the instantaneous rotational velocity of symbol_v.
4.For each time t, the local coordinates xl of a point M with respect to the frame are related to its coordinates xG into the global system, as follows:

5.The relative displacement of M between time 0 and t, with respect to the frame is related to its displacement with regard to the global system, as follows:

6.The relative velocity of M with respect to the frame is related to its velocity with regard to the global system, as follows:

where, is the driving velocity; that is the velocity of the point coincident with M at time t and fixed with respect to the reference frame.

7.The relative acceleration of M with respect to the frame M is related to its acceleration with regard to the global system, as follows:

Where, is the driving acceleration and is the acceleration, due to Coriolis forces.

8.For a moving reference frame, the reference frame position and orientation vary with time and are defined by N1, N2 and N3.

The origin of the frame is defined by the position of N1.

Nodes N1 and N2 define X’:

Plane N1, N2 and N3 define Y’:

Z is normal to plane X’ Y’

and Y’ is recomputed:

9.In a 2D analysis N1 and N2 define Y’.

frame_move_image

Reference frame identifier must be different from all skew identifiers.

See Also:

Skew and Frame (/SKEW & /FRAME)