*HEADING COUPLED ACOUSTIC ANALYSIS OF A MUFFLER, EXPLICIT SUBMODEL ANALYSIS--THIS IS THE SUBMODEL: INCLUDES THE SHELL STRUCTURE AND THE EXTERIOR AIR ** ** This input file needs the following files: ** **muffler_shell_nodes.inp **muffler_shell_elem.inp **muffler_extair_nodes_xpl.inp **muffler_extair_elem_xpl.inp ** ** It is recommended to run the analysis ** in DOUBLE PRECISION !!! ** ** PART INSTANCE: INTERIORAIR-1 ** *Parameter f=180.0 T=1.0/f omega=2*3.14159*f ** ------------------------------------------- ** ** PART INSTANCE: MUFFLERSHELL-1 ** *NODE,INPUT=muffler_shell_nodes.inp *ELEMENT,TYPE=S4R,INPUT=muffler_shell_elem.inp ** ------------------------------------------- *ELSET,ELSET=MUFFLERSHELL-1_I1,GENERATE 1458, 1500, 1 *SHELL SECTION,ELSET=MUFFLERSHELL-1_I1,MATERIAL=STEEL 0.00075, 5 ** ------------------------------------------- ** ** PART INSTANCE: OUTERAIR-1 ** *NODE,INPUT=muffler_extair_nodes_xpl.inp *ELEMENT,TYPE=AC3D8R,INPUT=muffler_extair_elem_xpl.inp ** ------------------------------------------- *ELSET,ELSET=OUTERAIR-1_I1,GENERATE 1501, 2734, 1 *SOLID SECTION,ELSET=OUTERAIR-1_I1,MATERIAL=AIR 1., ** ------------------------------------------- *NSET,NSET=OUTERAIR,ELSET=OUTERAIR-1_I1 ** ------------------------------------------- *ELSET,ELSET=SHELL2OUTERAIR_SPOS,GENERATE 1458, 1500, 1 *SURFACE,NAME=SHELL2OUTERAIR SHELL2OUTERAIR_SPOS, SPOS ** ------------------------------------------- *ELSET,ELSET=OUTERAIR2SHELL_S6 2100,2116,2420 *ELSET,ELSET=OUTERAIR2SHELL_S3 2100,2420,2421,2422 *ELSET,ELSET=OUTERAIR2SHELL_S4,GENERATE 1519, 1975, 19 *SURFACE,NAME=OUTERAIR2SHELL OUTERAIR2SHELL_S6, S6 OUTERAIR2SHELL_S3, S3 OUTERAIR2SHELL_S4, S4 ** ------------------------------------------- *ELSET,ELSET=SPHERE1_S3,GENERATE 2340, 2355, 1 *ELSET,ELSET=SPHERE1_S4,GENERATE 2664, 2734, 5 *SURFACE,NAME=SPHERE1 SPHERE1_S3, S3 SPHERE1_S4, S4 ** ------------------------------------------- *ELSET,ELSET=SPHERE2_S3,GENERATE 2036, 2051, 1 *ELSET,ELSET=SPHERE2_S4,GENERATE 1979, 2035, 4 *SURFACE,NAME=SPHERE2 SPHERE2_S3, S3 SPHERE2_S4, S4 ** ------------------------------------------- *ELSET,ELSET=CYLINDER_S6,GENERATE 1501, 1957, 19 *SURFACE,NAME=CYLINDER CYLINDER_S6, S6 ** ------------------------------------------- ** ** MATERIALS ** *MATERIAL,NAME=AIR *ACOUSTICMEDIUM,BULKMODULUS 1.42E5, *DENSITY 1.2, *MATERIAL,NAME=AIRABSORB *ACOUSTICMEDIUM,BULKMODULUS 1.42E5, *ACOUSTICMEDIUM,VOLUMETRICDRAG 1.2, *DENSITY 1.2, *MATERIAL,NAME=STEEL *DENSITY 7920., *ELASTIC 1.9E+11, 0.3 ** ------------------------------------------- *TIE,NAME=ACOST1 OUTERAIR2SHELL,SHELL2OUTERAIR *** ------------------------------------------- *AMPLITUDE,NAME=SINE,DEF=PERIODIC 1,,0.0,0.0 0.0,1.0,0,0 ** ** STEP: STEP-1 ** *NSET,NSET=INTER_P,ELSET=OUTERAIR2SHELL_S4 *NSET,NSET=OUTER_P,ELSET=CYLINDER_S6 *NSET,NSET=TEST_P INTER_P,OUTER_P *NSET,NSET=QA_TEST INTER_P, *NSET,NSET=shell,ELSET=MUFFLERSHELL-1_I1 *SUBMODEL, ABSOLUTE=1.E-3,GLOBAL ELSET=MUFFLERSHELL-1_I1 Shell, *STEP *DYNAMIC,EXPLICIT , *Boundary,submodel,step=1 shell,1,3 *Simpedance,nonreflecting=circular cylinder,0.7 *Simpedance,nonreflecting=spherical sphere1,0.7 *Simpedance,nonreflecting=spherical sphere2,0.7 ************* *FILE OUTPUT,NUM=1 *NODE FILE,NSET=INTER_P POR, ****************** *OUTPUT,FIELD,NUM=4 *NODE OUTPUT U,POR ******************* *OUTPUT,FIELD,NUM=1 *NODE OUTPUT,NSET=QA_TEST POR, ******************* ***OUTPUT,HISTORY,FREQ=1 ***NODE OUTPUT,NSET=TEST_P ***POR *END STEP