!DYNAMIC¶

Dynamic analysis control

Time t for each !AMPLITUDE specified in !BOUNDARY, !CLOAD and !DLOAD must be started from 0.0.

Parameter¶

TYPE = LINEAR    : Linear dynamic analysis
NONLINEAR : Nonlinear dynamic analysis

** 2nd line or later **

(2nd line) idx_eqa, idx_resp

Parameter Name	Attributions	Contents
idx_eqa	I	Solution of equation of motion (Direct time integration) (Default: 1) 1: Implicit method (Newmark-β method) 11: Explicit method (Center difference method)
idx_resp	I	Analysis type (Default: 1) 1: Time history response analysis 2: Frequency response analysis (Not included)

`idx_resp=1` (Time history response analysis)¶

(3rd line) t_start , t_end , n_step, t_delta

|Parameter Name |Attributions |Contents| |---------|------|---------------------------------------| | t_start | R |Analysis start time (Default: 0.0), not used| | t_end | R |Analysis end time (Default: 1.0), not used| | n_step | I |Overall No. of steps (Default: 1)| | t_delta | R |Time increment (Default: 1.0)|

(4th line) gamma , beta

Parameter Name	Attributions	Contents
gamma	R	Parameter γ of Newmark-β method (Default: 0.5)
beta	R	Parameter β of Newmark-β method (Default: 0.25)

(5th line) idx_mas ,idx_dmp , ray_m ,ray_k

Parameter Name	Attributions	Contents
idx_mas	I	Type of mass matrix (Default: 1) 1: Lumped mass matrix 2: Consistent mass matrix
idx_dmp	I	1: Rayleigh damping (Default: 1)
ray_m	R	Parameter R_m of Rayleigh damping (Default: 0.0)
ray_k	R	Parameter R_k of Rayleigh damping (Default: 0.0)

(6th line) nout, node_monit_1, nout_monit

Parameter Name	Attributions	Contents
nout	I	not used
node_monit_1	I	Monitoring node ID (Global) or node group name
nout_monit	I	Results output interval of displacement monitoring (Default: 1)

Note: Regarding the information of the monitoring node specified in this line, the displacement is output to the file <dyna_disp_NID.txt>, where NID is the global ID of the monitoring node, and each line includes the step number, time of the step, NID, u1, u2, and u3 in this order. The velocity and acceleration are also output to <dyna_velo_NID.txt> and <dyna_acce_NID.txt>, respectively, in the same format as the displacement. The nodal strain is output to <dyna_strain_NID.txt> and each line includes the step number, time of the step, NID, e11, e22, e33, e12, e23, and e13 in this order. The nodal stress is output to <dyna_stress_NID.txt> and each line includes the step number, time of the step, NID, s11, s22, s33, s12, s23, s13, and s_mises in this order. When monitoring nodes are specified by a node group, each of the files stated above is separately output for each node. When this output is specified, the kinetic energy, deformation energy and the overall energy of the overall analytic model will also be output to <dyna_energy.txt>.

(7th line) iout_list(1),iout_list(2),iout_list(3),iout_list(4),iout_list(5),iout_list(6)

Parameter Name	Attributions	Contents
iout_list(1)	I	Displacement output specification (Default: 0) 0: Not output, 1: Output
iout_list(2)	I	Velocity output specification (Default: 0) 0: Not output, 1: Output
iout_list(3)	I	Acceleration output specification (Default: 0) 0: Not output, 1: Output
iout_list(4)	I	Reaction force output specification (Default: 0) 0: Not output, 1: Output
iout_list(5)	I	Strain output specification (Default: 0) 1: Output 2: Output (Node base) 3: Output (Element base)
iout_list(6)	I	Stress output specification (Default: 0) 0: Not output (Element base and node base) 1: Output 2: Output (Node base) 3: Output (Element base)

Example of Use¶

!DYNAMIC, TYPE=NONLINEAR
1 , 1
0.0, 1.0, 500, 1.0000e-5
0.5, 0.25
1, 1, 0.0, 0.0
100, 55, 1
0, 0, 0, 0, 0, 0

`idx_resp=2` (Frequency response analysis)¶

(3rd line) f_start, f_end, n_freq, f_disp

Parameter Name	Attributions	Contents
f_start	R	Minimum frequency
f_end	R	Maximum frequency
n_freq	I	Number of divisions for the frequency range
f_disp	R	Frequency to obtain displacement

(4th line) t_start, t_end

Parameter Name	Attributions	Contents
t_start	R	Analysis start time
t_end	R	Analysis end time

(5th line) idx_mas, idx_dmp, ray_m ,ray_k

Parameter Name	Attributions	Contents
idx_mas	I	Type of mass matrix (Default: 1) 1: Lumped mass matrix
idx_dmp	I	1: Rayleigh damping (Default: 1)
ray_m	R	Parameter R_m of Rayleigh damping (Default: 0.0)
ray_k	R	Parameter R_k of Rayleigh damping (Default: 0.0)

(6th line) nout, vistype, nodeout

Parameter Name	Attributions	Contents
nout	I	Results output interval in time domain
vistype	I	Visualization type 1:Mode shapes 2:Time history results at f_disp
nodeout	I	Monitoring NODE ID in frequency domain

(7th line) iout_list(1),iout_list(2),iout_list(3),iout_list(4),iout_list(5),iout_list(6)

Parameter Name	Attributions	Contents
iout_list(1)	I	Displacement output specification (Default: 0) 0: Not output, 1: Output
iout_list(2)	I	Velocity output specification (Default: 0) 0: Not output, 1: Output
iout_list(3)	I	Acceleration output specification (Default: 0) 0: Not output, 1: Output
iout_list(4)	I	not used
iout_list(5)	I	not used
iout_list(6)	I	not used

Example of Use¶

!DYNAMIC
11 , 2
14000, 16000, 20, 15000.0
0.0, 6.6e-5
1, 1, 0.0, 7.2E-7
10, 2, 1
1, 1, 1, 1, 1, 1

!DYNAMIC¶

Parameter¶

idx_resp=1 (Time history response analysis)¶

Example of Use¶

idx_resp=2 (Frequency response analysis)¶

Example of Use¶

`idx_resp=1` (Time history response analysis)¶

`idx_resp=2` (Frequency response analysis)¶