*HEADING :SPRING-MASS SYSTEM WITH MASS PROPORTIONAL DAMPING **** testing *mass, alpha= **** The constants are such set that the results for U1 of NODE 3 **** should be the same as running 2.8.4-example A (exsd3glx.inp) **** *NODE,NSET=NALL 3,10.,0. ** ** Spring Definitions ** *ELEMENT,TYPE=SPRING1,ELSET=SPR1 1,3 ** ** Point Mass ** *ELEMENT,TYPE=MASS,ELSET=MA 9,3 *NSET,NSET=MASSES 3,12,13,102,103 *SPRING,ELSET=SPR1 1, 30.0, *MASS,ELSET=MA,ALPHA=4.6367852 0.02588, *RESTART,WRITE ** ** ** ** ** ----------- STEP 1 ----------- ** *STEP,NLGEOM STRETCH OUT *STATIC 1.E2,1.E2 *BOUNDARY 3,1,1,1. 3,2,6,0. *NODE PRINT,FREQ=2,SUMMARY=NO,GLOBAL=NO U,V,A *END STEP ** ** ** ------------ STEP 2 ------------ ** *STEP,INC=200 RELEASE *DYNAMIC,HAFTOL=0.1 5.E-4,0.7, *BOUNDARY,OP=NEW ** ** Removed previous BC's; let node 3 free in x dir ** 3,2,6,0. *MONITOR,NODE=3,DOF=1 *NODE PRINT,FREQ=2,SUMMARY=NO,GLOBAL=NO U,V,A *EL PRINT, FREQ=0 *ENERGY PRINT *OUTPUT,HISTORY,FREQUENCY=1 *ENERGY OUTPUT,VARIABLE=PRESELECT *EL PRINT, SUMMARY=NO ELKE,ELVD,ELSE *END STEP