https://forums.autodesk.com/t5/robot-structural-analysis-forum/modal-analysis-amp-footfall-analysis-oddities/m-p/8940191#M23730 <P>Hi</P><P>I have a model which is doing strange things.&nbsp; Despite the X and Y directions being turned off in the modal analysis I am getting Eigenvectors in these directions.&nbsp; Also the frequency limit cut off for the footfall doesn't seem to be very reliable (on this particular model).&nbsp; It seems to pull in modes higher than the cut off.&nbsp; Have you any suggestions why this may be?</P><P>Thanks</P><P>PS tried to attach the file but I got the attached error message</P> Wed, 31 Jul 2019 08:28:01 GMT GGB.BHB 2019-07-31T08:28:01Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/modal-analysis-amp-footfall-analysis-oddities/m-p/8940191#M23730 <P>Hi</P><P>I have a model which is doing strange things.&nbsp; Despite the X and Y directions being turned off in the modal analysis I am getting Eigenvectors in these directions.&nbsp; Also the frequency limit cut off for the footfall doesn't seem to be very reliable (on this particular model).&nbsp; It seems to pull in modes higher than the cut off.&nbsp; Have you any suggestions why this may be?</P><P>Thanks</P><P>PS tried to attach the file but I got the attached error message</P> Wed, 31 Jul 2019 08:28:01 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/modal-analysis-amp-footfall-analysis-oddities/m-p/8940191#M23730 GGB.BHB 2019-07-31T08:28:01Z https://forums.autodesk.com/t5/robot-structural-analysis-forum/modal-analysis-amp-footfall-analysis-oddities/m-p/8940614#M23731 <P>Model now attached</P> Wed, 31 Jul 2019 12:13:11 GMT https://forums.autodesk.com/t5/robot-structural-analysis-forum/modal-analysis-amp-footfall-analysis-oddities/m-p/8940614#M23731 GGB.BHB 2019-07-31T12:13:11Z