I have been tasked with trying to design a plastic welding horn for a 20KHz ultrasonic welder. This involves a lot of black magic as near as I can tell. I found papers on the web to get me a close design. Now I need to see if it is resonant at 20KHz. When I run the static frequency study it gives me the first 5 frequencies, the max at approx 9KHz. If I list the frequencies I see 12 have been calculated. The 12 one is approx 20KHz. I would like to go a little past this. I have tried everything to get Solidworks to just calculate the freq. between 15 and 25KHz or to show the results for all 12 frequencies. Can anyone help me with what I am doing wrong?
BTW - once I determine the part has the correct dimensions because it resonates at 20KHZ. I will do a dynamic study study to determine the displacement gain of the horn.