$$$$ ELFE NOTICE CHAT 11/09/12 21:16:00 7124 DATE 11/09/12 Operateur ELFE Voir aussi : --------------- RESU1 = ELFE |'LAPLACE' ! 'PLAQUE' LT1 | | E1 H1 NU1 RHO1 LCAM1 | | PC1 | | CHAM1 | | OP1 | OP2 | | | ST1 | | S0 LOM1 | | | | 'POUTRE' GEO1 (GE02) CHPO1 CHELEM LFR1 | | S0 POIN1 COMP1 IMETH1 (IMP1) | | | | 'ACOU' GEO1 CHPO1 CHELEM (TEXP) LFR1 | | S0 POIN1 COMP1 | | | | | | |'TEMPS' | 'POUTRE' STRU1 ATTA1 TEMP1 | | DT1 CHAR1 (M1) GREE1 | | ('NFOIS' NN1) | | | | LAPLACE PLATE OPTION --------------------- This option enables the user to calculate the transfer function of a plane plate in bending by means of an integral formulation in the frequency domain (Laplace) L1 : Contour mesh (SEG3 elements) H1 : Plate thickness (FLOTTANT type) E1 : Young's modulus (FLOTTANT type) NU1 : Poisson's ratio (FLOTTANT type) RHO1 : Volumic mass LCAM1 : List of external damping coefficients associated with each pulsation of the list LOM1 PC1 : Nodes composing the corners CHAM1 : Field of imposed boundary conditions possible components : WW : deflection WN : deflection normal derivative MN : bending moment KN : shear force OP1 : Point of application of the force OP2 : Point at which the displacement is calculated ST1 : Surface mesh within the plate only the deformed shape of which is requested (form of POI1 type elements) S0 : real part of Laplace variable LOM1 : list of pulsations (frequency scanning) RESU1 : TYPE TABLE if OP1 OP2 are given (transfer function) RESU1.1 : displacement modulus in OP2 (LISTREEL) RESU1.2 : displacement phase in OP2 (LISTREEL) if ST1 is given (deformed surface) RESU1.i : field defining the displacement for the ith pulsation of the list LOM1 (CHPOINT of MODU and PHAS components) LAPLACE BEAM OPTION --------------------- This option enables the user to calculate the transfer function of a system of beams (beam treillis) by means of the integral formulation in the frequency domain of LAPLACE. GEO1 : Object describing the system of beams (MAILLAGE SEG2 type) (GEO2) : Objet describing the same mesh as GEO1 with additional points where the associated displacement will be calculated for each beam of the system. CHPO1 : Object describing the boundary conditions at the extreme points (CHPOINT type). Particular values are allocated to the displacement vector (UX, UY, UZ ), to the force vector (FX, FY, FZ), to the rotation vector (RX,RY,RZ), to the momemt vector (MX, MY, MZ), and possibly to a punctual mass (MA). CHELEM : Object describing the characteristics of the MCHAML type beams : - the following characteristics are defined : - YOUN .. YOUNG's modulus - NU .... POISSON's ratio - RHO ... volumetric mass - SECT .. beam section - INRY .. moment of inertia /Oy (local base) - INRZ .. moment of inertia /Oz (local base) - TORS .. twisting moment (local base) - SECY .. reduced shear section /Oy - SECZ .. reduced shear section /oz - CAM ... viscous damping coefficient - ETA ... internal damping (in percent) - VECT .. vector defining axis Oy LFR1 : Object defining the calculation frequencies (LISTREEL type) ; if GEO2 is specified, LISTREEL length must equal 1 (a single calculation point of the modal deformed shape) S0 : REEL providing the abscissa in the LAPLACE variable : S = S0 + i W POIN1 : Object describing the place where the result can be found (POINT type) COMP1 : Object describing the requested component : UX, UY, UZ, RX, RY, RZ (MOT type) IMETH1 : ENTIER describing the selection of the solution method 1 .. GAUSS ; 2 .. GAUSS OPTIMISE Always choose IMETH1 = 2 which enables you to win a factor 4 on the solution time ; in fact, since the matrices to be solved for each sequence have always the same form, the position of Gauss pivot is registered once, then this is repeated. This could lead to a null Gauss pivot with an inversible matrix. Then the calculation would be resumed with IMETH1 = 1 IMP1 : ENTIER (0 or 1) giving or not the intermediate printing RESU1 : - if GEO2 is not specified: ------------------------ ---> EVOLUTION type object : frequency response curve of the chosen variable by means of "COMP" in modulus and phase - if GEO2 is not specified: ------------------------ ---> CHAMPOINT type object : champoint giving the corresponding displacement for each point of the mesh GEO2 The name of the variables for each point : - UXM , UYM , UZM ....modal displt modulus - UXP , UYP , UZP ... modal displt phase LAPLACE ACOU OPTION ------------------- This option enables the user to calculate the transfer function of a system of cylindrical pipes by means of the integral formulation in acoustico-mechanics in the frequency domain of Laplace. GEO1 : Object describing the system of pipes (MAILLAGE SEG2 type) CHPO1 : CHPOINT type object describing : a) the boundary conditions at the extreme points : - displacement vector : UX,UY,UZ - rotation vector : RX,RY,RZ - force vector : FX,FY,FZ - moment vector : MX,MY,MZ - acoustical impedance : A, B et R (at the end of the tube) with Ap+Bq=R p and q are therefore the relative pressure and flow, so : p=0 <=> open pipe q=0 <=> closed pipe b) local components : - point mass : MA - moment of inertias : JOX,JOY,JOZ - local stiffnesses in tension-compression : KX,KY,KZ in twisting : CX in bending : CY,CZ - pressure discontinuity : DP - flow discontinuity : DQ These components may be added to each point including those on which one or several boundary conditions are applied. CHELEM : Object describing the material and fluid characteristics, of MCHAML type : - the following characteristics are defined : - RINT .. pipe internal radius - REXT .. pipe external radius - KCYZ .. TIMOSHENKO constant - YOUN .. YOUNG's modulus - NU .... POISSON's ratio - RHO ... volumetric mass - CAM ... external damping coefficient - ETA ... internal damping coefficient - RHOF .. fluid volumetric mass - CSON .. sound speed - VECT .. vector defining axis Oy - for the elements defined in TEXP : - VECT .. vector defining axis Oy Note : this operator takes into account - the fluid transverse added mass in bending. - the modification of the sound speed within the fluid due to the pipe swelling. TEXP : Object describing characteristics (TABLE type) with the following structure TEXP.SOUSTYPE = 'TAB_EXPERIMENTALE'; TEXP. M1 = TABLE ; TEXP. M1 . i = TABLE; TEXP. M1 . i . MOT = xx ; with M1 mesh type object i integer varying from 1 to 14 (14 relations between the unknowns are required for defining the acousto-mechanical behavior) MOT key word defining the unknown to which the coefficient xx is allocated possible values of MOT : &AA$ with & being R or I (real or imaginary part) $ being A or B (element two extreme points) AA equalling UX UY UZ RX RY RZ FX FY FZ MX MY MZ LFR1 : Object describing the calculation frequencies (LISTREEL type) ; S0 : REEL supplying LAPLACE variable with the abscissa : S = S0 + i W POIN1 : Object describing the place where the result can be found (POINT type) COMP1 : Object describing the requested component : UX, UY, UZ, RX, RY, RZ, P or Q (MOT type) RESU1 : EVOLUTION type object: frequency response curve of the variable chosen by means of "COMP" in modulus and phase BEAM TIME OPTION ----------------- This option enables the user to calculate a system of beams in dynamics by means of integral equations in the temporal domain. STRU1 : Object describing the beam (STRUCTUR type) ATTA1 : Object describing the linkages between the elements (ATTACHE type) TEMP1 : Requested calculation time value (FLOTTANT type) DT1 : Calculation time step (FLOTTANT type) CHAR1 : Loading temporal description (CHARGEME type) GREE1 : Green functions (EVOLUTIO type) (GREEN operator) M1 : Truncation index of the convolution product (ENTIER) type 'NFOI' : Key word followed by : NNP1 : Frequency of CHPOINTs in SOLUT1 (ENTIER type) SOLUT1 : generated object of SOLUTION DYNAMIQUE type.
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