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Impulse respose using transient analysis

Impulse respose using transient analysis

Impulse respose using transient analysis

(OP)
Hi,

I am trying this simple example of a cantilever beam. I want to obtain the impulse response of the structure and have the following APDL script. I should get a harmonic response, what I get is a ramp.

I will appreciate if someone can point to my mistake.
=======================================================
finish
/clear

/PREP7                ! Enter preprocessor
K,1,0,0             ! Keypoints
K,2,1,0
L,1,2               ! Connect keypoints with line

ET,1,BEAM3              ! Element type
R,1,0.0001,8.33e-10,0.01    ! Real constants

MP,EX,1,2.068e11        ! Young's modulus
MP,PRXY,1,0.33          ! Poisson's ratio
MP,DENS,1,7830          ! Density

LESIZE,ALL,,,10         ! Element size
LMESH,1             ! Mesh the line

FINISH

!-----------------------------------------------------------
/SOLU               ! Enter solution phase

ANTYPE, TRANS            ! Transient analysis

D,1,ALL
TIME,1e-6
TIMINT,OFF
SOLVE

!At time equals 0.001s
TIME,0.001            ! Sets time to 0.001 seconds
KBC,1                ! Ramped load step
F,2,FY,-100            ! Load right end
TIMINT,ON
SOLVE

!At time equals 1s
TIME,1              ! Sets time to 1 second
KBC,1                ! Ramped load step
F,2,FY,0            ! Load right end
TIMINT,ON
SOLVE

 
FINISH  

!-----------------------------------------------------------

/POST26             ! Enter time history
 
NSOL,2,10,U,Y, UY_2        ! Calls data for UY deflection at node 2
STORE,MERGE              ! Stores the data
PLVAR,2,            ! Plots vs. time
==================================================================

HN

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