topic Re: finding unknown in Mathcad https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277689#M108554 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE><TABLE border="1"><TBODY><TR><TD>Thanks but i would prefer any other method without guess values or symbolic solver....</TD></TR></TBODY></TABLE></BLOCKQUOTE><P>All numeric non-linear solvers require a guess value. So you can either solve it by hand, using the symbolic solver, or using the numeric solver with a guess value. There are no other options.</P></BODY></HTML> Tue, 23 Feb 2016 14:35:24 GMT RichardJ 2016-02-23T14:35:24Z finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277683#M108548 can any one help me in finding T.max_2_10k_relief in the attached file i would be happy if the solution is obtained by not using symbolic solver here vonmises stress (sigmavon) is 120000psi Thu, 03 May 2018 14:40:16 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277683#M108548 jreddy 2018-05-03T14:40:16Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277684#M108549 <HTML><HEAD></HEAD><BODY><P>Not numerical nor symbolical but manual:</P><P><IMG __jive_id="98554" class="jive-image image-1" src="https://community.ptc.com/legacyfs/online/98554_pastedImage_0.png" style="max-height: 900px; max-width: 1200px;" /></P></BODY></HTML> Tue, 23 Feb 2016 14:01:17 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277684#M108549 ValeryOchkov 2016-02-23T14:01:17Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277685#M108550 <HTML><HEAD></HEAD><BODY><P>I know that....i'm looking for a numerical value for Tmax_2_10k_relief....</P></BODY></HTML> Tue, 23 Feb 2016 14:03:55 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277685#M108550 jreddy 2016-02-23T14:03:55Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277686#M108551 <HTML><HEAD></HEAD><BODY><P>Use a numeric solve block</P><P>Replace the assigment := by boolean =</P><P>Provide guess values for the four unknowns</P><P>Assign sigma.von the value you named</P><P></P><P>Hope the attached helps</P><P><IMG __jive_id="98551" alt="" class="jive-image image-1" height="507" src="https://community.ptc.com/legacyfs/online/98551_pastedImage_0.png" style="width: 398.252px; height: 507px;" width="398" /></P></BODY></HTML> Tue, 23 Feb 2016 14:04:11 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277686#M108551 Werner_E 2016-02-23T14:04:11Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277687#M108552 <HTML><HEAD></HEAD><BODY><P>Thanks but i would prefer any other method without guess values or symbolic solver....</P></BODY></HTML> Tue, 23 Feb 2016 14:11:47 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277687#M108552 jreddy 2016-02-23T14:11:47Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277688#M108553 <HTML><HEAD></HEAD><BODY><P>"any other" method??</P><P>What are you thinking of?</P></BODY></HTML> Tue, 23 Feb 2016 14:31:26 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277688#M108553 Werner_E 2016-02-23T14:31:26Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277689#M108554 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE><TABLE border="1"><TBODY><TR><TD>Thanks but i would prefer any other method without guess values or symbolic solver....</TD></TR></TBODY></TABLE></BLOCKQUOTE><P>All numeric non-linear solvers require a guess value. So you can either solve it by hand, using the symbolic solver, or using the numeric solver with a guess value. There are no other options.</P></BODY></HTML> Tue, 23 Feb 2016 14:35:24 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277689#M108554 RichardJ 2016-02-23T14:35:24Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277690#M108555 <HTML><HEAD></HEAD><BODY><P>please see the attached file the final value is changing if you try as i did in the attached file....check shear stress at thread relief<IMG alt="tttt.JPG" class="jive-image image-1" src="https://community.ptc.com/legacyfs/online/98566_tttt.JPG" style="height: auto;" /></P></BODY></HTML> Tue, 23 Feb 2016 14:41:38 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277690#M108555 jreddy 2016-02-23T14:41:38Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277691#M108556 <HTML><HEAD></HEAD><BODY><P>There ist no file attached and I don't see what you had changed and why you think that the output is not OK.</P><P></P><P>You can always check your result using the symbolic solution, <IMG src="https://community.ptc.com/legacyfs/online/emoticons/devil.png" />:</P><P><IMG __jive_id="98568" alt="" class="jive-image image-1" src="https://community.ptc.com/legacyfs/online/98568_pastedImage_0.png" style="max-width: 1200px; max-height: 900px;" /></P><P></P><P>EDIT: I just saw that you added a numeric evaluation.</P><P>You have a a boolean equation and if you evaluate that kind of equation you may get 0 (false)&nbsp; or 1 (true) as result.</P><P>Why did you add that numeric evaluation - it does not make any sense to me.</P><P></P><P>What you did has the very same effect as disabling that equation completely. Mathcad does not change tau.thread at all and uses the other three equations to solve for the other three variables. No wonder that the results differ.</P><P></P><P>WE</P></BODY></HTML> Tue, 23 Feb 2016 15:25:26 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277691#M108556 Werner_E 2016-02-23T15:25:26Z Re: finding unknown https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277692#M108557 <HTML><HEAD></HEAD><BODY><P>Great.....i will better use the above equation people here are too confused</P></BODY></HTML> Wed, 24 Feb 2016 06:53:28 GMT https://www.ptcusercommunity.com/t5/Mathcad/finding-unknown/m-p/277692#M108557 jreddy 2016-02-24T06:53:28Z