Complex eigenvalue extraction in Brake Squeal
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Complex eigenvalue extraction in Brake Squeal
by cyteoh09
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Dear All,
I am doing prediction of brake squeal using complex eigenvalue extraction in Abaqus/Standard 6.8. (CAE) The analysis completely done, but the real part of the system are zero for all mode.. What are the possible mistake that i made? Anyone can help?? Thanks You. Cyteoh |
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Re: Complex eigenvalue extraction in Brake Squeal
by Abd. Rahim
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could you give the step to rotate the the disc.
you should use *motion card instead of *boundary please take a look my phd thesis in the website given under my signature ABD. RAHIM ABU BAKAR,PhD *************************** Department of Automotive Engineering Head of Automotive Panel Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 UTM Skudai Johor, MALAYSIA Phone: +607-5534572 Mobile: +6012-9371480 Fax: +607-5566159 Web: www.fkm.utm.my/~arahim *************************** --- On Fri, 10/30/09, cyteoh09 <cyteoh09@...> wrote: From: cyteoh09 <cyteoh09@...> Subject: [ABAQUS] Complex eigenvalue extraction in Brake Squeal To: ABAQUS@... Date: Friday, October 30, 2009, 11:01 AM Dear All, I am doing prediction of brake squeal using complex eigenvalue extraction in Abaqus/Standard 6.8. (CAE) The analysis completely done, but the real part of the system are zero for all mode.. What are the possible mistake that i made? Anyone can help?? Thanks You. Cyteoh -- View this message in context: http://old.nabble. com/Complex- eigenvalue- extraction- in-Brake- Squeal-tp2608872 7p26088727. html Sent from the Abaqus Users mailing list archive at Nabble.com. [Non-text portions of this message have been removed] |
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Re: Complex eigenvalue extraction in Brake Squeal
by cyteoh09
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Hi ABD. RAHIM,
I used boundary condition to rotate the disc in static analysis. kindly refer to the attach input file. Please advise.. Looking forward for ur reply... Thanks.. Cyteoh Brake.inp |
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Re: Complex eigenvalue extraction in Brake Squeal
by Abd. Rahim
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replace in the 2nd step i.e
*Boundary, op=NEW, type=VELOCITY _PickedSet402, 5, 5, 10. with *motion, rotation, type=velocity _PickedSet402, 10, x1,y1,z1,x2,y2,z2 you need to speficy points of rotational axis (x1,y1,z1,x2,y2,z2) these points can be obtained from cae. ABD. RAHIM ABU BAKAR,PhD *************************** Department of Automotive Engineering Head of Automotive Panel Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 UTM Skudai Johor, MALAYSIA Phone: +607-5534572 Mobile: +6012-9371480 Fax: +607-5566159 Web: www.fkm.utm.my/~arahim *************************** --- On Mon, 11/2/09, cyteoh09 <cyteoh09@...> wrote: From: cyteoh09 <cyteoh09@...> Subject: Re: [ABAQUS] Complex eigenvalue extraction in Brake Squeal To: ABAQUS@... Date: Monday, November 2, 2009, 2:23 PM Hi ABD. RAHIM, I used boundary condition to rotate the disc in static analysis. kindly refer to the attach input file. Please advise.. Looking forward for ur reply... Thanks.. Cyteoh Abd. Rahim wrote: > > could you give the step to rotate the the disc. > > you should use *motion card instead of *boundary > > > please take a look my phd thesis in the website given under my signature > > > ABD. RAHIM ABU BAKAR,PhD > ************ ********* ****** > Department of Automotive Engineering > Head of Automotive Panel > Faculty of Mechanical Engineering > Universiti Teknologi Malaysia > 81310 UTM Skudai > Johor, MALAYSIA > > Phone: +607-5534572 > Mobile: +6012-9371480 > Fax: +607-5566159 > Web: www.fkm.utm. my/~arahim > ************ ********* ****** > > --- On Fri, 10/30/09, cyteoh09 <cyteoh09@yahoo. com> wrote: > > > From: cyteoh09 <cyteoh09@yahoo. com> > Subject: [ABAQUS] Complex eigenvalue extraction in Brake Squeal > To: ABAQUS@yahoogroups. com > Date: Friday, October 30, 2009, 11:01 AM > > > > > > > > Dear All, > > I am doing prediction of brake squeal using complex eigenvalue extraction > in > Abaqus/Standard 6.8. (CAE) > > The analysis completely done, but the real part of the system are zero for > all mode.. > > What are the possible mistake that i made? > > Anyone can help?? > > Thanks You. > > Cyteoh > -- > View this message in context: http://old.nabble. com/Complex- eigenvalue- > extraction- in-Brake- Squeal-tp2608872 7p26088727. html > Sent from the Abaqus Users mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > -- View this message in context: http://old.nabble. com/Complex- eigenvalue- extraction- in-Brake- Squeal-tp2608872 7p26156038. html Sent from the Abaqus Users mailing list archive at Nabble.com. [Non-text portions of this message have been removed] |
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Re: Complex eigenvalue extraction in Brake Squeal
by cyteoh09
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Hi Abd. Rahim,
I follow your instruction to replace in the 2nd step *Boundary, op=NEW, type=VELOCITY _PickedSet402, 5, 5, 10. with *motion, rotation, type=velocity _PickedSet402, 10, 0,0,0,0,50,0 Brake.inp but the result still the same. The 'effective damping ratio' and 'real part' of the eigenvalues still zero for all modes.. I run the .inp file in Abaqus command window with command 'abaqus interation job=brake.inp Hope you will give more advise. Thanks for your help.. Regards, Cyteoh
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Re: Complex eigenvalue extraction in Brake Squeal
by Abd. Rahim
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then you should select the entire disc for rotation and constrain all boltholes.
you cannot use reference point (RF) to tie with the boltholes. there is example for simulating brake squeal in abaqus documentation. please put efforts to find it. there is no easy way in solving a problem. ABD. RAHIM ABU BAKAR,PhD *************************** Department of Automotive Engineering Head of Automotive Panel Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 UTM Skudai Johor, MALAYSIA Phone: +607-5534572 Mobile: +6012-9371480 Fax: +607-5566159 Web: www.fkm.utm.my/~arahim *************************** --- On Wed, 11/4/09, cyteoh09 <cyteoh09@...> wrote: From: cyteoh09 <cyteoh09@...> Subject: Re: [ABAQUS] Complex eigenvalue extraction in Brake Squeal To: ABAQUS@... Date: Wednesday, November 4, 2009, 11:21 AM Hi Abd. Rahim, I follow your instruction to replace in the 2nd step *Boundary, op=NEW, type=VELOCITY _PickedSet402, 5, 5, 10. with *motion, rotation, type=velocity _PickedSet402, 10, 0,0,0,0,50,0 http://old.nabble. com/file/ p26186554/ Brake.inp Brake.inp but the result still the same. The 'effective damping ratio' and 'real part' of the eigenvalues still zero for all modes.. I run the .inp file in Abaqus command window with command 'abaqus interation job=brake.inp Hope you will give more advise. Thanks for your help.. Regards, Cyteoh Abd. Rahim wrote: > > replace in the 2nd step i.e > *Boundary, op=NEW, type=VELOCITY > _PickedSet402, 5, 5, 10. > > with > > *motion, rotation, type=velocity > _PickedSet402, 10, x1,y1,z1,x2, y2,z2 > > you need to speficy points of rotational axis (x1,y1,z1,x2, y2,z2) > these points can be obtained from cae. > > > ABD. RAHIM ABU BAKAR,PhD > ************ ********* ****** > Department of Automotive Engineering > Head of Automotive Panel > Faculty of Mechanical Engineering > Universiti Teknologi Malaysia > 81310 UTM Skudai > Johor, MALAYSIA > > Phone: +607-5534572 > Mobile: +6012-9371480 > Fax: +607-5566159 > Web: www.fkm.utm. my/~arahim > ************ ********* ****** > > --- On Mon, 11/2/09, cyteoh09 <cyteoh09@yahoo. com> wrote: > > > From: cyteoh09 <cyteoh09@yahoo. com> > Subject: Re: [ABAQUS] Complex eigenvalue extraction in Brake Squeal > To: ABAQUS@yahoogroups. com > Date: Monday, November 2, 2009, 2:23 PM > > > > > > > > Hi ABD. RAHIM, > > I used boundary condition to rotate the disc in static analysis. > kindly refer to the attach input file. Please advise.. > Looking forward for ur reply... > > Thanks.. > Cyteoh > > Abd. Rahim wrote: >> >> could you give the step to rotate the the disc. >> >> you should use *motion card instead of *boundary >> >> >> please take a look my phd thesis in the website given under my signature >> >> >> ABD. RAHIM ABU BAKAR,PhD >> ************ ********* ****** >> Department of Automotive Engineering >> Head of Automotive Panel >> Faculty of Mechanical Engineering >> Universiti Teknologi Malaysia >> 81310 UTM Skudai >> Johor, MALAYSIA >> >> Phone: +607-5534572 >> Mobile: +6012-9371480 >> Fax: +607-5566159 >> Web: www.fkm.utm. my/~arahim >> ************ ********* ****** >> >> --- On Fri, 10/30/09, cyteoh09 <cyteoh09@yahoo. com> wrote: >> >> >> From: cyteoh09 <cyteoh09@yahoo. com> >> Subject: [ABAQUS] Complex eigenvalue extraction in Brake Squeal >> To: ABAQUS@yahoogroups. com >> Date: Friday, October 30, 2009, 11:01 AM >> >> >> >> >> >> >> >> Dear All, >> >> I am doing prediction of brake squeal using complex eigenvalue extraction >> in >> Abaqus/Standard 6.8. (CAE) >> >> The analysis completely done, but the real part of the system are zero >> for >> all mode.. >> >> What are the possible mistake that i made? >> >> Anyone can help?? >> >> Thanks You. >> >> Cyteoh >> -- >> View this message in context: http://old.nabble. com/Complex- eigenvalue- >> extraction- in-Brake- Squeal-tp2608872 7p26088727. html >> Sent from the Abaqus Users mailing list archive at Nabble.com. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> [Non-text portions of this message have been removed] >> >> >> > http://old.nabble. com/file/ p26156038/ Brake.inp Brake.inp > -- > View this message in context: http://old.nabble. com/Complex- eigenvalue- > extraction- in-Brake- Squeal-tp2608872 7p26156038. html > Sent from the Abaqus Users mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > -- View this message in context: http://old.nabble. com/Complex- eigenvalue- extraction- in-Brake- Squeal-tp2608872 7p26186554. html Sent from the Abaqus Users mailing list archive at Nabble.com. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com [Non-text portions of this message have been removed] |
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