From the graph we see that the frequency is not dependent on structural damping, which was observed from the top of each roller is at the same frequency.
From the graph, we find that the frequency is independent of the Structural damping, which have from the amount of each se in that same frequency positions.
From graph we will find that the value of the frequency band, it would be up to Structural damping which is from the top of observation, but it's location is the same band เส่น