ANSYS Mechanical APDL Advanced Analysis Techniques Guide

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Transcript of ANSYS Mechanical APDL Advanced Analysis Techniques Guide

ANSYS Mechanical APDL Advanced Analysis Techniques Guide

ANSYS, Inc. Southpointe 275 Technology Drive Canonsburg, PA 15317 ansysinfo@ansys.com http://www.ansys.com (T) 724-746-3304 (F) 724-514-9494

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Table of Contents1. Probabilistic Design ................................................................................................................................ 1 1.1. Understanding Probabilistic Design .................................................................................................. 1 1.1.1. Traditional (Deterministic) vs. Probabilistic Design Analysis Methods ......................................... 2 1.1.2. Reliability and Quality Issues .................................................................................................... 3 1.2. Probabilistic Design Terminology ...................................................................................................... 3 1.3. Employing Probabilistic Design ......................................................................................................... 8 1.3.1. Create the Analysis File ............................................................................................................. 8 1.3.1.1. Example Problem Description .......................................................................................... 9 1.3.1.2. Build the Model Parametrically ........................................................................................ 9 1.3.1.3. Obtain the Solution ....................................................................................................... 10 1.3.1.4. Retrieve Results and Assign as Output Parameters .......................................................... 11 1.3.1.5. Prepare the Analysis File ................................................................................................ 12 1.3.2. Establish Parameters for Probabilistic Design Analysis ............................................................. 12 1.3.3. Enter the PDS and Specify the Analysis File ............................................................................. 13 1.3.4. Declare Random Input Variables ............................................................................................. 14 1.3.5. Visualize Random Input Variables ........................................................................................... 19 1.3.6. Specify Correlations Between Random Variables ..................................................................... 20 1.3.7. Specify Random Output Parameters ....................................................................................... 23 1.3.8. Choose a Probabilistic Design Method .................................................................................... 23 1.3.8.1. Probabilistic Method Determination Wizard ................................................................... 24 1.3.9. Execute Probabilistic Analysis Simulation Loops ...................................................................... 25 1.3.9.1. Probabilistic Design Looping ......................................................................................... 25 1.3.9.2. Serial Analysis Runs ....................................................................................................... 27 1.3.9.3. PDS Parallel Analysis Runs .............................................................................................. 27 1.3.9.3.1. Machine Configurations ........................................................................................ 28 1.3.9.3.1.1. Choosing Slave Machines ............................................................................. 28 1.3.9.3.1.2. Using the Remote Shell Option ..................................................................... 29 1.3.9.3.1.3. Using the Connection Port Option ................................................................ 31 1.3.9.3.1.4. Configuring the Master Machine ................................................................... 33 1.3.9.3.1.5. Illustration of the host set-up using port option ............................................ 34 1.3.9.3.1.6. Host and Product selection for a particular analysis ....................................... 35 1.3.9.3.2. Files Needed for Parallel Run ................................................................................. 36 1.3.9.3.3. Controlling Server Processes ................................................................................. 37 1.3.9.3.4. Initiate Parallel Run ............................................................................................... 38 1.3.10. Fit and Use Response Surfaces .............................................................................................. 38 1.3.10.1. About Response Surface Sets ....................................................................................... 39 1.3.10.2. Fitting a Response Surface ........................................................................................... 39 1.3.10.3. Plotting a Response Surface ......................................................................................... 40 1.3.10.4. Printing a Response Surface ......................................................................................... 40 1.3.10.5. Generating Monte Carlo Simulation Samples on the Response Surfaces ........................ 41 1.3.11. Review Results Data ............................................................................................................. 41 1.3.11.1. Viewing Statistics ......................................................................................................... 42 1.3.11.2. Viewing Trends ............................................................................................................ 43 1.3.11.3. Creating Reports .......................................................................................................... 44 1.4. Guidelines for Selecting Probabilistic Design Variables ..................................................................... 44 1.4.1. Choosing and Defining Random Input Variables ..................................................................... 44 1.4.1.1. Random Input Variables for Monte Carlo Simulations ..................................................... 44 1.4.1.2. Random Input Variables for Response Surface Analyses .................................................. 45 1.4.1.3. Choosing a Distribution for a Random Variable ............................................................... 45 1.4.1.3.1. Measured Data ..................................................................................................... 45Release 14.0 - SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

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ANSYS Mechanical APDL Advanced Analysis Techniques Guide 1.4.1.3.2. Mean Values, Standard Deviation, Exceedence Values ............................................. 45 1.4.1.3.3. No Data ................................................................................................................ 46 1.4.1.4. Distribution Functions ................................................................................................... 48 1.4.2. Choosing Random Output Parameters .................................................................................... 50 1.5. Probabilistic Design Techniques ...................................................................................................... 50 1.5.1. Monte Carlo Simulations ........................................................................................................ 50 1.5.1.1. Direct Sampling ............................................................................................................. 51 1.5.1.2. Latin Hypercube Sampling ............................