XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> 11.4 Using MSC Random
The execution of MSC Random is made of two parts. 1) Patran Interface and 2) MSC Random executable (Similar to Patran and MSC Nastran.
Output Files:
MSC Random produces various output files depending upon different action selected by user.
XY Plot:
Job_Name.log: Error Messages
Job_Name-xy.out: ASCII output files – Input description and warning messages
Job_Name.xy: ASCII XY Plot output file. This file can be imported in to Excel Spreadsheet.
Note: All GRID responses are processed in Analysis Coordinate System. Element results are in Element Coordinate System.
RMS Analysis:
Result_Name.log: Error Messages
Result_Name.out: ASCII RMS results output files
Result_Name.pat: Neutral result file that can be imported in to Patran database.
Note: All Grid RMS Fringe Plots/Results are in BASIC Coordinate System Element Results are in Element Coordinate System.
In addition, MSC Random will create following input files.
Job_Name.inp: This files will be read by MSC Random executable (similar to .bdf or .dat file created by Patran
Job_Name.rnd: User created or created by MSC Random Interface. This file contains the random input descriptions.
Contents of output files:
Job_Name.xy: This file is similar to MSC Nastran XYPUNCH file. First Line describes the type of plot, Elem/Node ID, Component/DOF and then followed by XY data representing Frequency Vs Result.
XYDATA,ACCE-PSDF:ID 92, Tx :RMS(*3.00) 5.05682E+04 Zero X-ing 3.32133E+02
1.00000000E+01 4.08137744E+03
1.06809082E+01 5.53827100E+03
1.11413689E+01 6.68424609E+03
1.13124104E+01 7.11009375E+03
1.16323595E+01 8.02400781E+03
1.18563261E+01 8.76009570E+03
....
....
XYDATA,ACCE-PSDF:ID 144, Tx :RMS(*3.00) 3.89760E+04 Zero X-ing 4.38824E+02
1.00000000E+01 1.08585098E+04
1.06809082E+01 1.47525918E+04
1.11413689E+01 1.78551055E+04
1.13124104E+01 1.90274238E+04
1.16323595E+01 2.15572695E+04
....
....
Job_Name.out: RMS Result output file.
THIS PROGRAM IS CONFIDENTIAL AND A TRADE SECRET OF MSC.SOFTWARE CORPORATION. THE RECEIPT OR
POSSESSION OF THIS PROGRAM DOES NOT CONVEY ANY RIGHTS TO REPRODUCE OR DISCLOSE ITS CONTENTS, OR TO
MANUFACTURE, USE, OR SELL ANYTHING HEREIN, IN WHOLE OR IN PART, WITHOUT THE SPECIFIC WRITTEN CONSENT
OF MSC.SOFTWARE CORPORATION.
* * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * *
* * * *
* * * *
* * * *
* * MSC.SOFTWARE * *
* * CORP * *
* * * *
* * M S C . P a t r a n * *
* * * *
* * Random Analysis * *
* * * *
* * VERSION - 2007.0.0 * *
* * * *
* * * *
* * * *
* * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * *
User Input........
XDB:C:\barbela\Random\_Production\2005\doc\Examples\cylinder-1\base-x.xdb
RESPONSE:ACCE
LOG_LIN:LOG
FACTOR:3.0
RFILE:C:\barbela\Random\_Production\2005\doc\Examples\cylinder-1\Random.rnd
OPTION:RMS
** Finished Reading Input **
*** Result Multiplier : 3.000 ***
No of Subcases : 1
No of Frequencies : 435
No of Randps : 1
No of Tabrnd1 : 1
Integration Scheme : Log-Log (to calculate RMS & Number of Zero Crossing)
Checking Coherence Function or Schwarz's Inequality
Abs((Pjk)*(Pjk)) / (Pjj * Pkk) <= 1.0 or Pjk * Conjg(Pjk) / (Pjj * Pkk) <= 1.0
Where Pjj and Pkk are Auto-PSD of subcase J and K and
Pjk is Cross PSD between Subcase J and K
** Grid RMS ACCE (In BASIC Coordinate System) **
Grid_Id Tx Ty Tz Rx Ry Rz
( Zero X-ing)( Zero X-ing)( Zero X-ing)( Zero X-ing)( Zero X-ing)( Zero X-ing)
1 2.30924E+04 0.00000E+00 0.00000E+00 2.58905E-05 8.98656E+03 6.57608E-04
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.69641E+03)(1.43129E+03)(1.84746E+03)
2 2.30924E+04 0.00000E+00 0.00000E+00 1.10007E+03 8.68984E+03 1.50619E+02
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.35119E+03)(1.42223E+03)(1.86314E+03)
3 2.30924E+04 0.00000E+00 0.00000E+00 2.07223E+03 8.13880E+03 1.78845E+02
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.35360E+03)(1.42746E+03)(1.85834E+03)
4 2.30924E+04 0.00000E+00 0.00000E+00 2.80963E+03 7.31220E+03 1.14604E+02
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.36068E+03)(1.43917E+03)(1.85221E+03)
5 2.30924E+04 0.00000E+00 0.00000E+00 3.17502E+03 6.23646E+03 4.71577E+01
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.35383E+03)(1.44905E+03)(1.84413E+03)
6 2.30924E+04 0.00000E+00 0.00000E+00 3.19763E+03 5.14193E+03 6.86768E+00
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.36159E+03)(1.47125E+03)(1.50072E+03)
7 2.30924E+04 0.00000E+00 0.00000E+00 2.79517E+03 4.08549E+03 2.65419E+01
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.35498E+03)(1.49633E+03)(1.82526E+03)
8 2.30924E+04 0.00000E+00 0.00000E+00 2.08432E+03 3.24476E+03 4.72351E+01
(9.74284E+02)(0.00000E+00)(0.00000E+00)(1.36012E+03)(1.53061E+03)(1.84444E+03)
……
……
Example Problems:
Instead of going through each form and every line item on the form, the usage of MSC Random and its various capabilities will be demonstrated using few examples.
Three different examples will be considered.
1. Cylinder under base acceleration PSDF input in one direction only.
2. Table, modeled with all solid elements, subjected to three simultaneous acceleration base PSDF Input in three directions.
3. Flat plate subjected to pressure and point load with Auto and Cross PSDF input.