**CABIN-AIR MODEL FOR ACOUSTIC ANALYSIS ** In order to reproduce the result in the example problem, COUPLED ** ACOUSTIC-STRUCTURAL ANALYSIS OF A PICKUP TRUCK, the parameter ** in tr_parameters.inp should be changed to 200. **PREPRINT,MODEL=YES,HISTORY=YES *include, input=tr_parameters_inphase.inp *include, input=tr_parameters.inp **-------------------------------------------------- **PART INSTANCE CABIN-1 *include, input=tr_cabin_nodes.inp *include, input=tr_cabin_nsets.inp *include, input=tr_cabin_elements.inp *include, input=tr_cabin_elsets.inp *include, input=tr_cabin_sections.inp *include, input=tr_cabin_air_w.inp *TIE,type=nodetosurface,name=cabin,position tol=140,adj=no cabin-1_cabin, air-1_air_orphan **------------------------------------------------- ** Make surface at firewall *surface, name=firewall cabin-1_cabin-firewall,SPOS **------------------------------------------------- ** MATERIAL DEFINITIONS *include, input=tr_materials_acous.inp *CONNECTOR BEHAVIOR, NAME=conn_door_hinges_beh *CONNECTOR ELASTICITY,COMPONENT=4 , *Material, name=Elastic-Air *Acoustic Medium 1.39E-1, *Density 1.2E-12, **------------------------------------------------ ** lock the doors *CONNECTOR MOTION cabin-1_conn_door_lock_left_cabin_cart, 1,0.0 cabin-1_conn_door_lock_left_cabin_cart, 2,0.0 cabin-1_conn_door_lock_left_cabin_cart, 3,0.0 cabin-1_conn_door_lock_left_cabin_cart, 4,0.0 cabin-1_conn_door_lock_left_cabin_cart, 5,0.0 cabin-1_conn_door_lock_left_cabin_cart, 6,0.0 ** cabin-1_conn_door_lock_right_cabin_cart, 1,0.0 cabin-1_conn_door_lock_right_cabin_cart, 2,0.0 cabin-1_conn_door_lock_right_cabin_cart, 3,0.0 cabin-1_conn_door_lock_right_cabin_cart, 4,0.0 cabin-1_conn_door_lock_right_cabin_cart, 5,0.0 cabin-1_conn_door_lock_right_cabin_cart, 6,0.0 *BOUNDARY cabin-1_retained_cabin_chassis_rear, 1,6,0 cabin-1_retained_cabin_radiator_chassis, 1,6,0 *IMPEDANCE PROPERTY, NAME=CARPET ,0.0005e9 *INCIDENT WAVE INTERACTION PROPERTY, NAME=PL, TYPE=PL 340343.0,1.2E-12 *INCIDENT WAVE INTERACTION PROPERTY, NAME=DI, TYPE=DIFFUSE 340343.0,1.2E-12,6 *AMPLITUDE, DEFINITION=TABULAR, NAME=WAVE 0.0,1.0,1000.0,1.0 ****------------------------------------------------ *nset,nset=qa_test_bound cabin-1_retained_cabin_chassis_rear, ****------------------------------------------------ *STEP *STEADY STATE DYNAMICS,INTERVAL=RANGE, DIRECT 120, *SIMPEDANCE,PROPERTY=carpet air_impedance, *INCIDENT WAVE INTERACTION, LOADCASE=1, PROPERTY=PL, PRESSUREAMP=WAVE FIREWALL,SOURCE,STANDOFF,1.0 **displacements of seat hook-up points **acoustic pressure at driver ear position *output,history *node output,nset=qa_test_bound u, ***node output,nset=air-1_ear_position **por, *output,field *node output,nset=air-1-all por, *END STEP ****------------------------------------------------ *STEP *STEADY STATE DYNAMICS,INTERVAL=RANGE, DIRECT 120, *SIMPEDANCE,PROPERTY=carpet air_impedance, *INCIDENT WAVE INTERACTION, LOADCASE=1, PROPERTY=DI, PRESSUREAMP=WAVE FIREWALL,SOURCE,STANDOFF,1.0 **displacements of seat hook-up points **acoustic pressure at driver ear position *output,history *node output,nset=qa_test_bound u, ***node output,nset=air-1_ear_position **por, **output,field **node output,nset=air-1-all **por, *END STEP