SDLD25 - System mass-arises with shock absorber viscous proportional (spectral response)

Transcription

1 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 1/6 SDLD25 - Syste ass-arises with sho absorber visous proportional (spetral response) Suary This one-way proble onsists in arrying out a spetral seisi analysis of a ehanial struture ade up of a set of ass-springs with visous sho absorbers subjeted to a seisi request provided in the shape of a spetru of answer of osillators pseudony in aeleration. Via this proble, one tests odal obination SRSS of the operator COMB_SISM_MODAL [U ]. In addition, one tests several operators of pre - treatent; DEFI_FONCTION and DEFI_NAPPE. This test is also a test of resorption of LICE. There are no differenes between the Code_Aster results and the LICE results.

2 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 2/6 1 Proble of referene 1.1 Geoetry U 1 U 2 U 3 U 8 x,u A P 1 P 2 P 3 P 8 B Speifi asses: P1 = P 2 = P 3 = = P 8 = Stiffnesses of onnetion: AP1 = P1P2 = P2P3 = = P8B = Visous depreiation: AP1 = P1P2 = P2P3 = = P8B = 1.2 Material properties Spring of elasti translation linear Speifi ass One-way visous daping =10 5 N / =10g =50 N / / s 1.3 Boundary onditions and loadings Not A and B : ebedded ( u= 0 ) Spetru of aeleration to the supports ü f,a noralized with 1. s 2 Points A and B : ü=ü f,a s % 10 5% fréquene (Hz)

3 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 3/6 2 Referene solution 2.1 Method of alulating used for the referene solution Coparison with other odes. 2.2 Results of referene Absolute aeleration aording to x at the points A, P1, P2, P3, P4.

4 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 4/6 3 Modeling A 3.1 Charateristis of odeling y A P 1 P 2 P 3 P 4 P 5 P 6 P 7 P 8 B x Charateristis of the eleents: DISCRETE with nodal asses M_T_D_N and atries of rigidity K_T_D_L and atries of daping A_T_D_L Liiting onditions: in all the nodes DDL_IMPO (TOUT=' OUI' DY = 0., DZ = 0. ) with the nodes ends (GROUP_NO = AB, DX = 0. ) Naes of the nodes: Not A = N1 Not B = N10 P 1 = N2 P 2 = N3... P 8 = N9 3.2 Charateristis of the grid Many nodes: 10 Many eshs and types: 9 SEG2 3.3 Sizes tested and results Identifiation Referene LICE Tolerane Referene Not regression Tolerane Eigen frequenies ,001 5,525 0, ,001 10,887 0, ,001 15,924 0, ,001 20,461 0, ,001 24,390 0, ,001 27,566 0, ,001 29,911 0, ,001 31,347 0,001 Size loalization ACCE_ABSOLU A DX ,136 0,001 P1 DX ,001 10,450 0,001 P2 DX ,001 19,030 0,001 P3 DX ,001 25,318 0,001 P4 DX ,001 28,946 0,001

5 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 5/6 3.4 Rears Mode Daping (in %) 0,868 1,710 2,500 3,213 3,830 4,331 4,698 4,924 Spetru ,033 3,928 2,282 1,601 1,283 1,136

6 Titre : SDLD25 - Systèe asse-ressort ave aortisseur vi[...] Date : 03/08/2011 Page : 6/6 4 Suary of the results Results Aster are idential to the LICE results until the seond deial. The variation on absolute aeleration at point A is due to the design assuption of the different pseudo-ode between LICE and Code_Aster.