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I applied 1000 N force and 900 hz frequency using the Steady State Dynamic Direct method but after 260 increments negative eigenvalue appeared in my analysis. Is there any way to avoid warnings and negative eigenvalue?

 

Warning as follow:

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-1-Rigid plate-1 AND ASSEMBLY_CP-1-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-4-Rigid plate-1 AND ASSEMBLY_CP-4-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-5-Rigid plate-1-lin-2-1 AND ASSEMBLY_CP-5-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-6-Rigid plate-1-lin-2-1 AND ASSEMBLY_CP-6-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-7-Rigid plate-1-lin-2-1 AND ASSEMBLY_CP-7-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

OVERCONSTRAINT CHECKS: THE *TIE PAIR BETWEEN SURFACES ASSEMBLY_CP-8-Rigid plate-1-lin-2-1 AND ASSEMBLY_CP-8-P2-44-1 ATTEMPTS TO TIE ONE DEFORMABLE AND ONE RIGID BODY. SINCE THE *TIE SLAVE SURFACE BELONGS IN PART OR ENTIRELY TO THE RIGID BODY, THE NODES ON THIS SURFACE WOULD BE OVERCONSTRAINED BY THE *RIGID BODY AND *TIE COMBINATION. THE SLAVE AND MASTER ARE SWITCHED SO THAT OVERCONSTRAINTS ARE AVOIDED.

FOR *TIE PAIR (ASSEMBLY_CP-1-P2-44-1-ASSEMBLY_CP-1-Rigid plate-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT. FOR *TIE PAIR (ASSEMBLY_CP-2-P2-44-1-ASSEMBLY_CP-2-Rigid plate-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT. FOR *TIE PAIR (ASSEMBLY_CP-3-P2-44-1-ASSEMBLY_CP-3-Rigid plate-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT. FOR *TIE PAIR (ASSEMBLY_CP-4-P2-44-1-ASSEMBLY_CP-4-Rigid plate-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT,MODEL=YES FOR COMPLETE PRINTOUT. FOR *TIE PAIR (ASSEMBLY_CP-5-P2-44-1-ASSEMBLY_CP-5-Rigid plate-1-lin-2-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT. FOR *TIE PAIR (ASSEMBLY CP-6-P2-44-1-ASSEMBLY CP-6-Rigid plate-1-lin-2-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT.

 

FOR *TIE PAIR (ASSEMBLY_CP-8-P2-44-1-ASSEMBLY_CP-8-Rigid plate-1-lin-2-1), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY *PREPRINT, MODEL=YES FOR COMPLETE PRINTOUT.

For models with material and/or global damping: in the direct steady state dynamic procedure the reaction force calculation for structural elements does not include damping force for transverse shear components. Additionally, mass matrix is diagonalized for reaction force calculation. Therefore, it may give rise to incorrect reaction force results. For correct values of reaction forces, in a presence of damping, it is recommended to use the modal steady state dynamics procedure based on sim architecture.

The system matrix has 1 negative eigenvalues.

The system matrix has 1 negative eigenvalues.

The system matrix has 1 negative eigenvalues.

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