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The figure above shows a simulation in which contact with the model occurs multiple times. However, the plot does not indicate all of the contact forces. To state the conclusion first: There is no problem with the analysis results.
The reason that the plot does not show some of the contact forces is that most simulation programs, including RecurDyn, mark the data at certain intervals (discrete time) when plotting graphs rather than using continuous time.
Suppose that the plot draws data at 0.05 second intervals and contact occurs at 0.99 seconds.
In the above figure, the plot shows contact forces of 0 at 0.95 seconds and 1.00 seconds but nothing at 0.99 seconds. Therefore, it seems as if no contact occurred between 0.95 and 1.00 seconds.
If you are interested in only how contact affects the behavior of the system, it may not be necessary to fully reflect the contact forces in the graph of the simulation.
However, if it is necessary to show the exact contact force values in the plot, then you must increase the displayed intervals so that the value at 0.99 seconds appears on the plot. To do so, open the Analysis dialog window and increase the Plot Multiplier Step Factor value. This increases the amount of output data included in the RPLT file, or the plot output file, so the plot will display the contact force of every impact, as shown in the following figure.
Be careful not to enter an unnecessarily large number in the Plot Multiplier Step Factor field. The larger the factor is, the more data the RPLT file has to save. Select an appropriate factor after considering your requirements. (The size of the RPLT file increases based on the factor. In this example, the factor is 100, so the resulting RPLT file will be approximately 100 times larger than the previous file.)
