MotionView User's Guide

Driver Demand File (DDF)

Driver Demand File (DDF)

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Driver Demand File (DDF)

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You can define the driver path as a table of centerline points in Cartesian coordinates.  Driver uses the AKIMA interpolation scheme to interpolate between the nodes.

altair_driver_ddf_example_mv

[ALTAIR_HEADER]

FILE_TYPE = 'DDF'

FILE_VERSION = 1.0

FILE_FORMAT  = 'ASCII'

[UNITS]

(BASE)

{length  force      angle       mass    time}

'm'   'newton'   'degrees'   'kg'    'sec'

[DEMAND_VECTORS]

{X                Y                 Z}

2.1000            0.0000            0.0000

1.1000            0.1050            0.0000

0.1001            0.2200            0.0000

-0.8995           0.3451            0.0000

-1.8989           0.4803            0.0000

-2.8979           0.6256            0.0000

-3.8964           0.7810            0.0000

-4.8942           0.9466            0.0000

-5.8913           1.1224            0.0000

-6.8876           1.3084            0.0000

-7.8830           1.5046            0.0000

-8.8773           1.7111            0.0000

-9.8705           1.9278            0.0000

-10.8624          2.1549            0.0000

-11.8530          2.3922            0.0000

Defining acceleration or velocity profile in a DDF.

Example:

[DEMAND_ACC]

TYPE = 'CURVE'

FILE = 'xyz_demand_acc_fo8.ddf'

DEMAND_VECTOR = 'DEMAND_ACC'

[DEMAND_VECTORS]

{X    Y     Z     DA}

0     0     0     3

-1    0     0     3

-2    0     0     3

-3    0     0     3

-4    0     0     3

-5    0     0     3

-6    0     0     3

-7    0     0     3

-8    0     0     3

-9    0     0     3

-10   0     0     3

-11   0     0     3

-12   0     0     3

-13   0     0     3

-14   0     0     3

-15   0     0     3