**CABIN-AIR MODEL FOR ACOUSTIC ANALYSIS ** In order to reproduce the result in the example problem, COUPLED ** ACOUSTIC-STRUCTRUAL ANALYSIS OF A PICKUP TRUCK, the parameters ** and in tr_parameters.inp should both be changed to 200, ** should be changed to 25. **PREPRINT,MODEL=YES,HISTORY=YES *include, input=tr_parameters_inphase.inp *include, input=tr_parameters.inp **-------------------------------------------------- **PART INSTSTANCE 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 air-1_air_orphan, cabin-1_cabin **------------------------------------------------- ** 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 **------------------------------------------------ *STEP *FREQUENCY,normalization=mass ,,200 **------------------------------------------------ *OUTPUT, FIELD, MODE LIST , *NODE OUTPUT U,POR **------------------------------------------------ *ENDSTEP *STEP *STEADY STATE DYNAMICS,INTERVAL=RANGE 35,120, *CLOAD cabin-1_chassis_load_1, 3, 100.0 cabin-1_chassis_load_2, 3, 50.0 **displacements of seat hook-up points **acoustic pressure at driver ear position *output,history *node output,nset=cabin-1_retained_cabin_chassis u, *node output,nset=air-1_ear_position por, *END STEP *STEP *STEADY STATE DYNAMICS,subspace projection,INTERVAL=RANGE 35,120, *CLOAD cabin-1_chassis_load_1, 3, 100.0 cabin-1_chassis_load_2, 3, 50.0 **displacements of seat hook-up points **acoustic pressure at driver ear position *output,history *node output,nset=cabin-1_retained_cabin_chassis u, *node output,nset=air-1_ear_position por, *END STEP