I performed a modal analysis of multiple similar systems using Ansys Modal, after identifying frequencies with the highest participation factor and effective mass-to-mass ratio for each system. However, some systems’ fundamental frequencies are near to another system’s eigenfrequency. <\/p>\n
Now, I want to check the response of each system at the fundamental frequency of system 1, that is, how fast the amplitude of each system increases at the fundamental frequency of system 1. For that, I need each system’s amplitude vs time graph, as shown in the sketch below. I am trying transient structural, but I am encountering two issues: how to give force. The force will be an ultrasonic force with a frequency equal to the fundamental frequency of system 1, say 66000 Hz, and an amplitude of 0.8 uN. How do I input this force in transient structural as a function?<\/p>\n