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MODELING OF MECHANICAL SYSTEMS BY ANSYS m k Example:2.1 k=35000 N/m m=100 kg ω=18.71 rad/s=2.98 Hz * Run ANSYS Interactive * Set Working Directory * Run Notepad text editor and write the following commands below. /prep7 et,1,mass21 et,2,combin14 r,1,0,100 r,2,35000,0 n,1,0,0 n,2,0,0.25 type,1 real,1 e,2 type,2 real,2 e,1,2 1 2 /solu d,all,ux,0 d,all,uz,0 antype,2 modopt,lanb,1 solve finish Save as e01.txt Write e01.txt in ANSYS Command Window General Postproc > Results Summary d,1,uy,0 eplot File>Clear&Start New...>OK>YES

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In Example 2.1, * The command file is prepared with a text editor. (Notepad) * The file is run in ANSYS GUI can used by clicking ANSYS menu without preparing a command file. et,1,mass21 Main Menu>Preprocessor>Element Type>Add/Edit/Delete>Add...> Help>Help on can be used for more information abut the ANSYS commnads. The commands are recorded in a file with an extension of.log The.log file can be examined in a text editor. Structural Mass>3D mass 21 * Programs establish a mathematical model of a system, solve it and give results In CAD/CAE programs like ANSYS: * System elements and connections are defined in programs with commands

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G y2y2 y1y1 kck c L1L1 L2L2 m,I yAyA yByB Homework 01C - Problem 4: m=1050 kg, I=670 kg-m 2 k=35300 N/m, c=2000 Ns/m L 1 =1.7 m, L 2 =1.4 m y A and y B are the inputs, y 1 ve y 2 generalized coordinates. f 1 = Hz, f 2 = Hz Soluiton by ANSYS: /prep7 et,1,beam3 et,2,mass21 et,3,combin14 r,1,0.2,7e-4,0.1 r,2,0,1050,0,0,0,670 r,3,35300,2000 mp,ex,1,200e type,1 real,1 mat,1 e,1,3 e,3,2 n,1,0,0 n,2,3.1,0 n,3,1.7,0 n,4,0,-0.25 n,5,3.1,-0.25 type,2 real,2 e,3 type,3 real,3 e,1,4 e,2,5 d,all,ux,0 d,all,uz,0 d,4,uy,0 d,5,uy,0 antype,2 modopt,lanb,2 solve finish General Postprocessing> Results Summary /solu eplot

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