*HEADING 3-D model of light-service cargo crane--Dynamic drop load S.I. Units (m, kg, N, sec) ** ** Nodal coordinates ** *NODE 100 , 0, 0, 1 104, 8,1.5,.1 107,0,1,1 *NGEN, NSET=TRUSSA 100,104 104,107 *NCOPY, CHANGE NUMBER=100, OLDSET=TRUSSA, REFLECT=MIRROR, NEW SET=TRUSSB 0.,0.,0.,1.,0.,0. 0.,1.,0. *NCOPY, CHANGE NUMBER=200, OLDSET=TRUSSA, SHIFT 0.,0.,0. 0.,0.,0.,0.,0.,1.,0. *NCOPY, CHANGE NUMBER=200, OLDSET=TRUSSB, SHIFT 0.,0.,0. 0.,0.,0.,0.,0.,1.,0. *ELEMENT, TYPE=B33, ELSET=OUTA 100, 100,101 101, 101,102 102, 102,103 103, 103,104 104, 104,105 105, 105,106 106, 106,107 *ELEMENT, TYPE=B33, ELSET=BRACEA 110, 101,107 111, 101,106 112, 102,106 113, 102,105 114, 103,105 *ELEMENT, TYPE=B33, ELSET=OUTB 200, 200,201 201, 201,202 202, 202,203 203, 203,204 204, 204,205 205, 205,206 206, 206,207 *ELEMENT, TYPE=B33, ELSET=BRACEB 210, 201,207 211, 201,206 212, 202,206 213, 202,205 214, 203,205 *ELEMENT, TYPE=B33, ELSET=CROSSEL 300, 306,406 301, 306,401 302, 301,401 303, 302,402 304, 402,305 305, 305,405 306, 405,303 307, 303,403 ** ****** END OF MESH GENERATION COMMANDS ****** ** ** ** Define element normals that would be altered by averaging ** *NORMAL, TYPE=ELEMENT 113, 102, -0.3986, 0.9114, 0.1025 113, 105, -0.3986, 0.9114, 0.1025 213, 202, -0.3986, 0.9114, -0.1025 213, 205, -0.3986, 0.9114, -0.1025 103, 104, -0.1820, 0.9829, 0.0205 203, 204, -0.1820, 0.9829, -0.0205 *ELSET, ELSET=TRUSSA OUTA,BRACEA *ELSET, ELSET=TRUSSB OUTB,BRACEB ** *NSET, NSET=ATTACH 100,107,200,207 ** *BEAM GENERAL SECTION, SECTION=BOX, ELSET=OUTA, DENSITY=7800. 0.10,0.05,0.005,0.005,0.005,0.005 -0.1118, 0.0, -0.9936 200.E9,80.E9 *BEAM GENERAL SECTION, SECTION=BOX, ELSET=OUTB, DENSITY=7800. 0.10,0.05,0.005,0.005,0.005,0.005 -0.1118, 0.0, 0.9936 200.E9,80.E9 *BEAM GENERAL SECTION, SECTION=BOX, ELSET=BRACEA, DENSITY=7800. 0.03,0.03,0.003,0.003,0.003,0.003 -0.1118, 0.0, -0.9936 200.E9,80.E9 *BEAM GENERAL SECTION, SECTION=BOX, ELSET=BRACEB, DENSITY=7800. 0.03,0.03,0.003,0.003,0.003,0.003 -0.1118, 0.0, 0.9936 200.E9,80.E9 ** *BEAM GENERAL SECTION, SECTION=BOX, ELSET=CROSSEL, DENSITY=7800. 0.03,0.03,0.003,0.003,0.003,0.003 0.0,1.0,0.0 200.E9,80.E9 ** ** Multi-point constraints ** *MPC PIN,101,301 PIN,102,302 PIN,103,303 PIN,105,305 PIN,106,306 PIN,201,401 PIN,202,402 PIN,203,403 PIN,205,405 PIN,206,406 ** ** Constraint equations ** *EQUATION 2, 104,1,1.0, 204,1,-1.0 2, 104,2,1.0, 204,2,-1.0 ** ** Time variation of loading ** *AMPLITUDE, NAME=BOUNCE, VALUE=RELATIVE 0., 0., 0.01, 1.0, 0.2, 1.0, 0.21, 0. ** ** History data ** ** ** Step 1: Extract nodes and frequencies ** *STEP, PERTURBATION Frequency extraction of the first 30 modes *FREQUENCY, EIGENSOLVER=LANCZOS ** ** Change 30 to 5 (or 2) for 5 (or 2) modes ** Note that one needs to change the "30" ** after the *MODAL DAMPING card ** 30, ** ** Boundary conditions ** *BOUNDARY ATTACH, ENCASTRE ** ** Output requests ** *EL PRINT, FREQUENCY=0 *NODE PRINT, FREQUENCY=0 *MODAL FILE *END STEP ** ** Step 2: Transient dynamic analysis ** *STEP, PERTURBATION Simulation of Drop Load on Crane *MODAL DYNAMIC 0.005, 0.5 ** ** Damping ** *MODAL DAMPING, MODAL=DIRECT ** ** Change 30 to 5 (or 2) for 5 (or 2) modes ** Change 0.05 to 0.1 (or 0.01) for 10% (or 1%) damping ** 1, 30, 0.05 *SELECT EIGENMODES, GENERATE 1,30,1 ** ** Loads ** *CLOAD, AMPLITUDE=BOUNCE 104, 2, -1.0E4 ** ** Output requests ** *OUTPUT, FIELD, FREQUENCY=5, VARIABLE=PRESELECT *NSET, NSET=TIP 104, 204 *OUTPUT, HISTORY, FREQUENCY=1 *NODE OUTPUT, NSET=TIP U, *NODE OUTPUT, NSET=ATTACH RF, *ENERGY OUTPUT ALLKE, ALLSE, ALLVD, ALLWK, ETOTAL *EL PRINT, FREQUENCY=0 *NODE PRINT, FREQUENCY=0 ** ********************************** ** OUTPUT FOR ABAQUS QA PURPOSES ********************************** *NODE FILE, FREQUENCY=20 U, V, A *END STEP