/IMPDISP

Block Format Keyword Defines imposed displacements on a group of nodes.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/IMPDISP/impdisp_ID/unit_ID
impdisp_title
fct_IDT Dir Skew_ID sens_ID grnd_ID   icoor      
Ascalex FscaleY Tstart Tstop    

Definitions

Field Contents SI Unit Example
impdisp_ID Imposed displacement block identifier.

(Integer, maximum 10 digits)

 
unit_ID Unit Identifier.

(Integer, maximum 10 digits)

 
impdisp_title Imposed displacement block title.

(Character, maximum 100 characters)

 
fct_IDT Time function identifier.

(Integer)

 
Dir Direction: X, Y, and Z in translation; XX, YY, and ZZ in rotation.

(Text)

 
Skew_ID Skew identifier.

(Integer)

 
sens_ID Sensor identifier.
0 (sensor activated)
The imposed displacement is applied at time of sensor activation and function is shifted in time.

(Integer)

 
grnd_ID Node group on which the imposed displacement is applied.

(Integer)

 
icoor Coordinate system usage type.
= 0
Cartesian coordinates.
= 1
Cylindrical coordinates.

(Integer)

 
Ascalex Abscissa (time) scale factor for fct_IDT.

Default = 1.0 (Real)

[ s ]
FscaleY Ordinate (displacement) scale factor for fct_IDT.

Default = 1.0 (Real)

[ m ] or [ rad ]
Tstart Start time.

(Real)

[ s ]
Tstop Stop time.

Default = 1030 (Real)

[ s ]

Comments

  1. The displacement direction must be right justified in the ten characters of field number 2.
  2. If Tstart and Tstop are specified, the displacement is imposed between these times, but the time versus displacement function is not shifted to begin at Tstart.
  3. When a sensor is defined sens_ID, the imposed displacement is applied at the time of sensor activation and the function is shifted by the sensor activation time.
  4. When a sensor sens_ID is used with Tstart and Tstop, the imposed displacement will only occur if the sensor activation time occurs between Tstart and Tstop.
  5. The AscaleX and FscaleY are used to scale the abscissa (time) and ordinate (displacement or angle).
    The actual load function value is calculated as:(1)
    F ( t ) = F s c a l e y f T ( t A s c a l e x ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaciOraiGacIcacaWG0bGaaiykaiabg2da9iaadAeacaWGZbGaam4y aiaadggacaWGSbGaamyzamaaBaaaleaacaWG5baabeaakiabgwSixl GacAgadaWgaaWcbaGaamivaaqabaGcdaqadaqaamaalaaabaGaamiD aaqaaiaadgeacaWGZbGaam4yaiaadggacaWGSbGaamyzamaaBaaale aacaWG4baabeaaaaaakiaawIcacaGLPaaaaaa@520D@

    Where, f T MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaciOzamaaBaaaleaacaWGubaabeaaaaa@3BC7@ is the function of fct_IDT.

  6. If icoor=1, the directions X, Y, and Z (resp. XX, YY, and ZZ) refer to translations along (resp. rotations around) the radial direction (r), azimuthal angular direction ( θ ) and longitudinal direction (Z) (/SKEW/FIX).

    cyl_coord_system
    Figure 1.
  7. If icoor=1 when imposing the translational displacement in the radial, resp. the azimuthal direction, the displacement of the node is set so that:(2)
    δ r ( t ) = r ˙ d t = F s c a l e y f T ( t A s c a l e x ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaeqiTdq2aaSbaaSqaaiaadkhaaeqaaOWaaeWaceaacaWG0baacaGL OaGaayzkaaGaeyypa0Zaa8qaaeaaceWGYbGbaiaacaWGKbGaamiDai abg2da9aWcbeqab0Gaey4kIipakiaaysW7caWGgbGaam4Caiaadoga caWGHbGaamiBaiaadwgadaWgaaWcbaGaamyEaaqabaGccqGHflY1ci GGMbWaaSbaaSqaaiaadsfaaeqaaOWaaeWaaeaadaWcaaqaaiaadsha aeaacaWGbbGaam4CaiaadogacaWGHbGaamiBaiaadwgadaWgaaWcba GaamiEaaqabaaaaaGccaGLOaGaayzkaaaaaa@5BBD@
    (3)
    r e s p . θ = θ ˙ d t = F s c a l e y f T ( t A s c a l e x ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaamOCaiaadwgacaWGZbGaamiCaiaac6cacaaMe8UaeqiUdeNaeyyp a0Zaa8qaaeaacuaH4oqCgaGaaiaadsgacaWG0bGaeyypa0daleqabe qdcqGHRiI8aOGaaGjbVlaadAeacaWGZbGaam4yaiaadggacaWGSbGa amyzamaaBaaaleaacaWG5baabeaakiabgwSixlGacAgadaWgaaWcba GaamivaaqabaGcdaqadaqaamaalaaabaGaamiDaaqaaiaadgeacaWG ZbGaam4yaiaadggacaWGSbGaamyzamaaBaaaleaacaWG4baabeaaaa aakiaawIcacaGLPaaaaaa@5EE9@

    Where, f T MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbb a9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0Firpe pesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcba GaciOzamaaBaaaleaacaWGubaabeaaaaa@3BC7@ is the function of fct_IDT.