MAXCYCMODE
MAXCYCMODE, LSTEP1,
SBSTEP1, Cmp1x1,
LSTEP2, SBSTEP2,
Cmp1x2, Comp,
Numsect
Computes the maximum results value of cyclic mode pairs at the same frequency or the
amplitude of a single complex mode.
LSTEP1Load step for the first mode in the pair. (Set
LSTEP1andLSTEP2to the same integer value if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)SBSTEP1Substep for the first mode in the pair. (Set
SBSTEP1andSBSTEP2to the same integer value if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)Cmp1x1Complex value key for the first mode in the pair.
'Real'
—
Indicates the real part of the first mode (default).
'Imag'
—
Indicates the imaginary part of a complex mode. (Used only if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)
LSTEP2Load step for the second mode in the pair. (Set
LSTEP1andLSTEP2to the same integer value if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)SBSTEP2Substep for the second mode in the pair. (Set
SBSTEP1andSBSTEP2to the same integer value if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)Cmp1x2Complex value key for the second mode in the pair.
'Real'
—
Indicates the real part of the second mode (default).
'Imag'
—
Indicates the imaginary part of a complex mode. (Used only if you are using MAXCYCMODE to calculate the amplitude of a single complex mode.)
CompComponent for which a maximum value is to be obtained. Valid
Complabels and component descriptions are listed in the Notes section.NumsectNumber of sectors. This should only be used for cyclically symmetric modes computed using the CYCLIC command.
Notes
There is no command default, and only
Cmp1x1 and Cmp1x2 have argument defaults. Values must be specified for all other
command arguments except for Numsect, which is only required if the
command is used for computing the maximum of cyclic modes calculated in a cyclic symmetry analysis using the
CYCLIC command.
This command is valid only for mass normalized modes (MODOPT,,,,,,OFF).
For a model generated with the CYCLIC command, results are only valid when the solution coordinate system is aligned with the cyclic coordinate system. Issuing MAXCYCMODE while the cyclic sector is expanded (/CYCEXPAND,,ON) will result in resetting the cyclic expansion back to the sector (/CYCEXPAND,,OFF).
This command has two different functionalities:
To compute the maximum results value of cyclic mode pairs at the same frequency that are computed from a cyclically symmetric system.
To compute the amplitude of a single complex mode calculated in a modal analysis using the damped eigensolver (MODOPT, DAMP).
To compute the maximum results value of cyclic mode pairs at the same frequency
This command can be used to compute the maximum results value of cyclic mode pairs at the same frequency that are computed from a cyclically symmetric system. Because two modes at the same frequency have indeterminate mode shapes, the combined mode pair must be considered to compare cyclic mode pairs from different solves or models. The maximum values computed are an estimate of the maximum value for each of the modes in the pair.
This command can be used on any mode pairs at the same frequency that are computed in a modal analysis (ANTYPE,MODAL) of a cyclically symmetry system modeled in any of the following ways:
A cyclic symmetry model generated from the CYCLIC command
A cyclic symmetry model generated under the multistage approach using the MSOPT and CECYCMS commands
A cyclic symmetry model generated using no symmetry boundary conditions (full 360° model).
Set the Cmplx1 and Cmplx2 values to Real to compute the maximum value of two cyclic modes at the
same frequency.
Valid Comp labels are listed in the following table. The
maximum values obtained are in the coordinate system defined by the RSYS command.
Valid
Comp Labels | |
Comp Label | Description |
| UX | Displacement in the X direction |
| UY | Displacement in the Y direction |
| UZ | Displacement in the Z direction |
| UCOMP | Displacement in the X, Y, and Z directions |
| USUM | Displacement vector sum |
| SX | Stress in the X direction |
| SY | Stress in the Y direction |
| SZ | Stress in the Z direction |
| SCOMP | Stress in the X, Y, and Z directions |
To compute the amplitude of a single complex mode
An alternative functionality of this command is to compute the amplitude of a single complex mode that was calculated in a modal analysis using the damped eigensolver (MODOPT, DAMP). In this case, specify the real and imaginary parts of a single mode instead of only real parts of two separate modes. This is useful for cyclic symmetry or multistage cyclic symmetry analyses since SET,,,,AMPL is not supported.