damper desgn

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damper design by various method

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ANSYS Mechanical APDL Feature Archive

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Table of ContentsAbout This Archive ...................................................................................................................................... vii I. Legacy Features ....................................................................................................................................... 1 1. Piping Models ................................................................................................................................... 3 1.1. What the Piping Commands Can Do for You ................................................................................ 3 1.2. Modeling Piping Systems with Piping Commands ....................................................................... 3 1.2.1. Specify the Jobname and Title ............................................................................................ 4 1.2.2. Set Up the Basic Piping Data ............................................................................................... 4 1.2.3. Define the Piping System's Geometry ................................................................................. 4 1.2.3.1. Review and Modify Your Piping Model ....................................................................... 5 1.3. Example Piping Model Input ....................................................................................................... 5 2. Subroutines ....................................................................................................................................... 9 2.1. Creep Subroutine UserCr ............................................................................................................ 9 2.2. Subroutine UserPL (Writing Your Own Plasticity Laws) ............................................................... 10 2.3. Subroutine UserVisLaw (Defining Viscosity Laws) ....................................................................... 12 2.4. Subroutine usflex (Computes the flexibility factor for PIPE16 and PIPE18) ................................... 13 3. Restarting a Direct Coupled-Field Analysis .................................................................................... 15 3.1. Singleframe Restart ................................................................................................................... 15 3.1.1. Singleframe Restart Requirements .................................................................................... 15 3.1.2. Singleframe Restart Procedure ......................................................................................... 17 3.1.3. Restarting a Nonlinear Analysis From an Incompatible Database ....................................... 18 3.1.3.1. Re-establishing Boundary Conditions ....................................................................... 19 4. Partial Solution Procedure .............................................................................................................. 21 4.1. Partial Inertia Relief Calculations ................................................................................................ 21 4.2. Comparison of Linear Perturbation and Partial Solution Procedures ........................................... 22 4.3. Surface Solution ....................................................................................................................... 23 II. Legacy Commands ................................................................................................................................ 25 III. Legacy Elements .................................................................................................................................. 75 BEAM4: 3-D Elastic Beam ....................................................................................................................... 77 CONTAC12: 2-D Point-to-Point Contact .................................................................................................. 91 PIPE16: Elastic Straight Pipe ................................................................................................................... 99 PIPE18: Elastic Curved Pipe .................................................................................................................. 109 PLANE42: 2-D Structural Solid .............................................................................................................. 119 SOLID45: 3-D Structural Solid .............................................................................................................. 127 CONTAC52: 3-D Point-to-Point Contact ................................................................................................ 135 PIPE59: Immersed Pipe or Cable .......................................................................................................... 143 SHELL63: Elastic Shell .......................................................................................................................... 161 PLANE82: 2-D 8-Node Structural Solid ................................................................................................. 171 SOLID92: 3-D 10-Node Tetrahedral Structural Solid .............................................................................. 179 SOLID95: 3-D 20-Node Structural Solid ................................................................................................ 185 IV. Legacy Theory .................................................................................................................................... 193 1. Archived Theory Element Library ................................................................................................. 195 1.1. BEAM4 - 3-D Elastic Beam ........................................................................................................ 195 1.1.1. Stiffness and Mass Matrices ............................................................................................ 195 1.1.2. Gyroscopic Damping Matrix ........................................................................................... 199 1.1.3. Pressure and Temperature Load Vector ........................................................................... 199 1.1.4. Local to Global Conversion ............................................................................................. 199 1.1.5. Stress Calculations .......................................................................................................... 201 1.2. CONTAC12 - 2-D Point-to-Point Contact ................................................................................... 203 1.2.1. Element Matrices ............................................................................................................ 203 1.2.2. Orientation of the Element ............................................................................................. 205Release 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 Feature Archive 1.2.3. Rigid Coulomb Friction ................................................................................................... 205 1.3. PIPE16 - Elastic Straight Pipe .................................................................................................... 206 1.3.1. Assumptions and Restrictions ......................................................................................... 207 1.3.2. Stiffness Matrix ............................................................................................................... 207 1.3.3. Mass Matrix .............................................................................