https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/499573#M809 <P>Hello, There are lots of issues here. I am trying to simulate a electronics chassis on a tray with LORD type isolators with the spring model. First, how do you make them visible in results. I cannot seem to see them. So run a static "check" simulation (1 G in one direction) and I get some results. The reaction check out, etc. I run an eigenvalue extraction. I get the model shapes (without springs) and they seem reasonable. I run a random vibration and I get the fatal error, saying that I have an unconstrained degree of freedom. The message continues that I should run a constrained Modal Analysis with rigid mode search to see the unconstrained degrees of freedom. Well, I did that and 1) I didn't have any rigid modes. (with the rigid mode option on and the lowest frequency to start the search at "0" Hz.&nbsp; HELP. Any suggestions???</P> <P>Thanks in advance.</P> Tue, 30 Jan 2018 22:43:18 GMT rhilson 2018-01-30T22:43:18Z https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/499573#M809 <P>Hello, There are lots of issues here. I am trying to simulate a electronics chassis on a tray with LORD type isolators with the spring model. First, how do you make them visible in results. I cannot seem to see them. So run a static "check" simulation (1 G in one direction) and I get some results. The reaction check out, etc. I run an eigenvalue extraction. I get the model shapes (without springs) and they seem reasonable. I run a random vibration and I get the fatal error, saying that I have an unconstrained degree of freedom. The message continues that I should run a constrained Modal Analysis with rigid mode search to see the unconstrained degrees of freedom. Well, I did that and 1) I didn't have any rigid modes. (with the rigid mode option on and the lowest frequency to start the search at "0" Hz.&nbsp; HELP. Any suggestions???</P> <P>Thanks in advance.</P> Tue, 30 Jan 2018 22:43:18 GMT https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/499573#M809 rhilson 2018-01-30T22:43:18Z https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/557383#M810 <P>spring to ground</P> <P>creo simulate 2.0</P> Mon, 25 Jun 2018 15:12:04 GMT https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/557383#M810 skunks 2018-06-25T15:12:04Z https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/674554#M811 <P>&nbsp;a belated thank you.</P> Mon, 29 Jun 2020 14:21:25 GMT https://www.ptcusercommunity.com/t5/Analysis/Spring-in-CREO-2-0-simulate/m-p/674554#M811 rhilson 2020-06-29T14:21:25Z