The Modal Analysis must be pre-stressed with the Static Structural system. In the Analysis Settings of the Modal system, the Future Analysis field under Analysis Data Management must be set to MSUP Analyses. To activate the Cyclic Mode Superposition option, turn on the Beta flag by selecting Yes in the Cyclic Mode Superposition field.
Note: Most Forced Response results require generated files. Set the Delete Unneeded Files option to No. This option is under Analysis Data Management in the Analysis Settings of the Modal system.
Leave the Solver Type within the Solver Controls set to . Only is supported. For more information, see Mode-Superposition Harmonic Cyclic Symmetry Analysis.
Note: For Mistuning and Aerocoupling, the files with the extensions .rstp, .r001, .rdb, and .ldhi are required. In the Modal Analysis settings, the Delete Unneeded Files field must be set to No to ensure these files are present.
Alternatively, add a post command in the Solution of the Modal to copy over the files, as follows:
/post1 ! Enter /SOLU module ! Copy the RSTP file to file.rst in user files ! (RSTP is the results file extension after Linear perturbation prestressed modal) /COPY,file.rst,,,%_wb_userfiles_dir(1)%file.rstp file,,rst ! Open file.rst in APDL /show,png,rev ! Save plots in in png format from APDL /yrange,0,3000, ! Set the Y range for the next plotting to 0-3000 Hz. plzz,16043 ! Plots the speed lines (16043 RPM) in interference diagram /show,close fini /COPY,file.r001,,,%_wb_userfiles_dir(1)%file.r001 /COPY,file.rdb,,,%_wb_userfiles_dir(1)%file.rdb /COPY,file.ldhi,,,%_wb_userfiles_dir(1)%file.ldhi