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Analysis results are often transformed using FFT.
However, when a value such as acceleration is converted using FFT, it is expected that a value to be higher than 200 Hz will be obtained, but it may appear only up to 50 Hz.
The solution is quite simple; increasing the number of analysis results.
Specifically, you need to increase the STEP and set the Max Step Size to a sufficiently small value.
For example, even if a model with characteristics of 200 Hz or higher is simulated, if the result value shown in the result file does not indicate 200 Hz or higher, the characteristics cannot be determined by using FFT.
Therefore,
1. You need to increase the STEP to ensure that a sufficient number of data can be obtained.
2. Make sure that the Step Size is small enough so that the solver can calculate it.
If you want to check the characteristics of a model with 200Hz, it is recommended to set the number of STEPs by considering about 3~4 times. (At least twice)
That means to set it to 600~800 Hz as follows. (If End time = 1)
STEP = 600~800 (기왕이면 1000?)STEP = 600~800 (ideal if it is 1000)
Maximum Time Step = 0.001~0.0015
RecurDyn solver is an implicit solver and uses variable steps. Therefore, when the Max. Step Size is large (for example, 0.01), even if the STEP is set to 1000, only 200 to 300 can be recorded in the RPLT.
