Please unsubscribe me from this list. -----Original Message----- From: xansys-temp-request@list.xansys.org <xansys-temp-request@list.xansys.org> Sent: Thursday, November 2, 2023 12:31 AM To: xansys-temp@list.xansys.org Subject: Xansys Digest, Vol 156, Issue 1 Send Xansys mailing list submissions to xansys-temp@list.xansys.org To subscribe or unsubscribe via email, send a message with subject or body 'help' to xansys-temp-request@list.xansys.org You can reach the person managing the list at xansys-temp-owner@list.xansys.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Xansys digest..." Today's Topics: 1. Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads (Bohlen, Dan (GE Aerospace, US)) 2. Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads (Benjamin HAGEGE) 3. Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads (Metin Ozen) ---------------------------------------------------------------------- Message: 1 Date: Wed, 1 Nov 2023 13:40:15 +0000 From: "Bohlen, Dan (GE Aerospace, US)" <dan.bohlen@ge.com> Subject: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Message-ID: <7aa09b1a0d7748e98f718c2d7b9fdde6@ge.com> Content-Type: text/plain; charset="us-ascii" Thanks. Any simple examples like a cylindrical tube in bending? -----Original Message----- From: Harish Radhakrishnan <harish.radhakrishnan@ansys.com> Sent: Wednesday, November 1, 2023 9:33 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Subject: EXT: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads WARNING: This email originated from outside of GE. Please validate the sender's email address before clicking on links or attachments as they may not be safe. Sorry, I had meant to add another example also but missed. Here is one using the General Axisymmetric elements on a nonlinear transient analysis. They are quite versatile and can be used in Static, Transient, Modal etc. They can also be connected to 3D solid elements if needed. https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/ans_tec/teccamshaft.html Harish Radhakrishnan Product Manager, Mechanical Products +1 (281)717-1598 -----Original Message----- From: Bohlen, Dan (GE Aerospace, US) <dan.bohlen@ge.com> Sent: Wednesday, November 1, 2023 8:29 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Subject: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads [External Sender] Thanks, but that looks like modal analysis - looking to do static stress. -----Original Message----- From: Harish Radhakrishnan <harish.radhakrishnan@ansys.com> Sent: Wednesday, November 1, 2023 8:58 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Subject: EXT: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads WARNING: This email originated from outside of GE. Please validate the sender's email address before clicking on links or attachments as they may not be safe. Hi Dan, The SOLID272/273 elements can be used to model axisymmetric parts with non-axisymmetric loads. There is good example in the Tech Demo guide on this. https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/ans_tec/tecrotordyn.html Harish Radhakrishnan Product Manager, Mechanical Products +1 (281)717-1598 -----Original Message----- From: Bohlen, Dan (GE Aerospace, US) <dan.bohlen@ge.com> Sent: Wednesday, November 1, 2023 7:09 AM Subject: [Xansys] Modeling question. How to model an axisymmetric part with non-axisymmetric loads [External Sender] Hi All, This is sort of a lost art. I think it ought to pretty easy, but can't crack it. I'd like to model an axisymmetric shaft with something like PLANE25 elements and apply non-axisymmetric loads like an over turning moment on one end or a vertical shear on one end. I've modeled this expanding the model out in 3D, but we'd like to do studies and 2D could be a lot faster. I've played around with static and harmonic analysis using the MODE command mode,1,1. It will solve but the results aren't correct. Also, I would think I can expand the plotting of the results 360 degrees. I've tried the /EXPAND command with no success. Hoping some one can point me in the right direction. Thanks, Dan Bohlen Senior Engineer, Stress Analysis STAR review chairman, military structures NGP2 engine focal GE Aerospace 1 Neumann Way Evendale, OH 45215 USA Build B90 Column L 3.75 M/D H358 Cell 513-917-3402 Building 200 Desk Phone 3-8816 GE FOCUS: Safety, Quality, Delivery, Cost "In God we trust, all others bring data." W Edwards Deming _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list ------------------------------ Message: 2 Date: Wed, 1 Nov 2023 15:09:17 +0100 From: Benjamin HAGEGE <Benjamin.HAGEGE@UTC.fr> Subject: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Message-ID: <9A931217-3092-4AE7-BEA2-F91EA808EBCA@UTC.fr> Content-Type: text/plain; charset=utf-8 Hi Dan, As an axisymetric model involves that everything is axisymetric, it absolutly needs an axisymetric load / BC. So the key is « Can you decompose a load that is non-axi into a sum of axi loads ? ». I remember this kind of problem with a SOL101 Nastran problem I was giving to my students in the early 2000’s : glass of wine pinched, so we decomposed the pinching pressure (non-axi but distributed like p0cos(theta)) into Fourier’s series… Benjamin HAGEGE associate prof. UTC (France) > Le 1 nov. 2023 à 13:09, Bohlen, Dan (GE Aerospace, US) <dan.bohlen@ge.com> a écrit : > > Hi All, > > This is sort of a lost art. I think it ought to pretty easy, but can't crack it. I'd like to model an axisymmetric shaft with something like PLANE25 elements and apply non-axisymmetric loads like an over turning moment on one end or a vertical shear on one end. I've modeled this expanding the model out in 3D, but we'd like to do studies and 2D could be a lot faster. > > I've played around with static and harmonic analysis using the MODE command mode,1,1. It will solve but the results aren't correct. Also, I would think I can expand the plotting of the results 360 degrees. I've tried the /EXPAND command with no success. > > Hoping some one can point me in the right direction. > > Thanks, > > > > Dan Bohlen > Senior Engineer, Stress Analysis > STAR review chairman, military structures > NGP2 engine focal > GE Aerospace > 1 Neumann Way > Evendale, OH 45215 USA > > Build B90 Column L 3.75 > M/D H358 Cell 513-917-3402 > > Building 200 Desk Phone 3-8816 > > GE FOCUS: Safety, Quality, Delivery, Cost > > "In God we trust, all others bring data." W Edwards Deming > > > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send > an email to xansys-temp-leave@list.xansys.org If you are receiving too > many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list ------------------------------ Message: 3 Date: Thu, 2 Nov 2023 04:30:43 +0000 From: Metin Ozen <metin@ozeninc.com> Subject: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Message-ID: <BYAPR06MB599155E3A590BDF7EEDF8B1BB4A6A@BYAPR06MB5991.nam prd06.prod.outlook.com> Content-Type: multipart/related; boundary="_004_BYAPR06MB599155 E3A590BDF7EEDF8B1BB4A6ABYAPR06MB5991namp_"; type="multipart/alternative" Back in 1985, at the second Ansys users conference, I presented a paper on roller bearing loads on axisymmetric structures where back then, I had to simulate roller bearing loads by decomposing them into Fourier series in “/PREP6” (yes, there used to be a PREP6 in addition to PREP7). The key here is the structure is to be “axi-symmetric. The second important thing here is that when you expand your load into Fourier series, are you taking enough terms in Fourier series so that you are representing your loads 99-100% because if you take too few number of terms in Fourier series, you may not be loading the axisymmetric structure to full 100% of the load! Therefore, there needs to be a check to make sure enough terms in Fourier series are taken so that the full load is accounted for (this may have to be done outside of Ansys; also check your reaction forces). Again, it is a valid approach as long as: * Structure is axisymmetric * Load is harmonic/periodic (and can be represented by Fourier series expansion) * Enough Fourier series terms are taken to represent the full load on the structure. The last item above is really the fact that if you have concentrated loads (or forces) that are applied say at every 20 degrees around the axisymmetric structure, then this may not be the right approach because it will take you thousands of Fourier series terms to be able to represent local loads (You may as well go to a 3D slice model). This methodology works well when you have these periodic loads “nicely distributed” around the circumference meaning that you can take a few Fourier series terms to represent these loads. To be able to answer Dan’s question, we need more information on: * Is the structure truly axisymmetric * Are the load truly harmonic/periodic around the axis of symmetry or non-axisymmetric * What is the expected structural behavior? (Axisymmetric or not) If it is a simple bending problem, then you may want to take a look at VM43 in APDL Verification Manual… Metin Ozen, Ph.D., ASME Fellow Principal/CEO Ozen Engineering, Inc. - Ansys Elite Channel Partner America’s Channel Partner of the Year: 2015, 2018, 2021 Phone: 800-832-3767 Email: metin@ozeninc.com<mailto:metin@ozeninc.com> 1210 E Arques Ave., #207, Sunnyvale, CA 94085 [signature_229924829] All customers can access our Help Center Knowledge Base<https://support.ozeninc.com/help-center> and submit technical support tickets through our Customer Portal<https://support.ozeninc.com/portal>. From: Benjamin HAGEGE <Benjamin.HAGEGE@UTC.fr> Date: Wednesday, November 1, 2023 at 10:54 PM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Subject: [Xansys] Re: Modeling question. How to model an axisymmetric part with non-axisymmetric loads [You don't often get email from benjamin.hagege@utc.fr. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] Hi Dan, As an axisymetric model involves that everything is axisymetric, it absolutly needs an axisymetric load / BC. So the key is « Can you decompose a load that is non-axi into a sum of axi loads ? ». I remember this kind of problem with a SOL101 Nastran problem I was giving to my students in the early 2000’s : glass of wine pinched, so we decomposed the pinching pressure (non-axi but distributed like p0cos(theta)) into Fourier’s series… Benjamin HAGEGE associate prof. UTC (France) > Le 1 nov. 2023 à 13:09, Bohlen, Dan (GE Aerospace, US) <dan.bohlen@ge.com> a écrit : > > Hi All, > > This is sort of a lost art. I think it ought to pretty easy, but can't crack it. I'd like to model an axisymmetric shaft with something like PLANE25 elements and apply non-axisymmetric loads like an over turning moment on one end or a vertical shear on one end. I've modeled this expanding the model out in 3D, but we'd like to do studies and 2D could be a lot faster. > > I've played around with static and harmonic analysis using the MODE command mode,1,1. It will solve but the results aren't correct. Also, I would think I can expand the plotting of the results 360 degrees. I've tried the /EXPAND command with no success. > > Hoping some one can point me in the right direction. > > Thanks, > > > > Dan Bohlen > Senior Engineer, Stress Analysis > STAR review chairman, military structures > NGP2 engine focal > GE Aerospace > 1 Neumann Way > Evendale, OH 45215 USA > > Build B90 Column L 3.75 > M/D H358 Cell 513-917-3402 > > Building 200 Desk Phone 3-8816 > > GE FOCUS: Safety, Quality, Delivery, Cost > > "In God we trust, all others bring data." W Edwards Deming > > > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send > an email to xansys-temp-leave@list.xansys.org If you are receiving too > many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list -------------- next part -------------- A message part incompatible with plain text digests has been removed ... 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