**CHASSIS SUBSTRUCTURE FOR ACOUSTIC ANALYSIS
**  In order to reproduce the result in the example problem, COUPLED 
**  ACOUSTIC-STRUCTRUAL ANALYSIS OF A PICKUP TRUCK, the parameter 
**  <nfreq> in tr_parameters.inp should  be changed to 200.  
**
*include,input=tr_all_nodes.inp
*include,input=tr_parameters_inphase.inp
*include,input=tr_parameters.inp
*include,input=tr_materials_acous.inp
*include,input=tr_chassis_elts.inp
*include,input=tr_acous_chassis_coup.inp
*include,input=tr_chassis_mpc.inp
**---------------------------------
*step
*frequency,normalization=mass, SIM=NO
<nfreq>,
**<neigenmodes>,
*boundary
retained_acous_chassis,1,6
*end step
**-----------------------------------
*step
*substructure generate, type=z45, overwrite, 
recovery matrix=<recov_yes_no>, mass matrix=yes,grav=no,
libr=tr_acous_chassis
**
**
*RETAINED NODAL DOFS,sorted=no
retained_acous_chassis,
*SELECT EIGENMODES,generate
1,<nfreq>,1
**
*substructure load case, name=engine_1
*cload
chassis_engine_1,3,1.0
*substructure load case, name=engine_2
*cload
chassis_engine_2,3,1.0
*substructure load case, name=engine_3
*cload
chassis_engine_3,3,1.0
**
*substructure matrix output, stiffness=no, 
mass=no, recovery=no,grav=yes, 
file=lib_acous_chassis
*end step
****-----------------------------------