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Frequency Study

Question asked by Robert Eppig on Nov 24, 2017
Latest reply on Nov 25, 2017 by Bill McEachern

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.