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1. Introduction to Multibody Simulation
1.1. Benefits of the Finite Element Method for Modeling Multibody Systems
1.2. Overview of the Multibody Analysis Process
1.3. The Ansys-ADAMS Interface
1.4. Learning More About Multibody Dynamics
2. Modeling in a Multibody Simulation
2.1. Modeling Flexible Bodies in a Multibody Analysis
2.1.1. Element Choices for Flexible Bodies
2.2. Modeling Rigid Bodies in a Multibody Analysis
2.2.1. Defining a Rigid Body
2.2.2. Rigid Body Degrees of Freedom
2.2.3. Rigid Body Boundary Conditions
2.2.4. Representing Parts of a Complex Model with Rigid Bodies
2.2.5. Connecting Joint Elements to Rigid Bodies
2.2.6. Modeling Contact with Rigid Bodies
2.3. Connecting Multibody Components with Joint Elements
2.3.1. Joint Element Types
2.3.2. Material Behavior of Joint Elements
2.3.3. Reference Lengths and Angles for Joint Elements
2.3.4. Boundary Conditions for Joint Elements
2.3.5. Connecting Bodies to Joints
3. Performing a Multibody Analysis
3.1. Kinematic Constraints
3.2. Convergence Criteria
3.3. Initial Conditions
3.3.1. Apply Linear Acceleration in a Dummy Transient Analysis
3.3.2. Apply Large Numerical Damping Over a Short Interval
3.4. Damping
3.4.1. Numerical Damping
3.4.2. Structural Damping
3.5. Time-Step Settings
3.6. Solver Options
4. Reviewing Multibody Analysis Results
4.1. Reviewing Results in POST1
4.2. Reviewing Results in POST26
4.3. Output of Joint Element Quantities
4.4. Energy Output
5. Using Component Mode Synthesis Superelements in a Multibody Analysis
5.1. CMS Superelements in a Multibody Analysis
5.2. Flexible Body Types
5.3. Substructuring Overview
5.4. Master Degrees of Freedom in a Substructured Multibody Simulation
5.5. Steps for Performing a Substructured Multibody Simulation
5.5.1. Step 1: Prepare the Full Model for a Substructured Multibody Analysis
5.5.2. Step 2: Create the Substructures (Generation Pass)
5.5.3. Step 3: Build the CMS-based Model (Use Pass)
5.5.4. Step 4: Run the Multibody Analysis
5.5.5. Step 5: Expand all Solutions (Expansion Pass)
5.5.6. Step 6: Create the Merged Results File
5.5.7. Step 7: Postprocess the Results
6. Example Multibody Analysis: Crank Slot Mechanism
6.1. Problem Description
6.2. Problem Specifications
6.3. Defining Joints
6.4. Performing the Rigid Body Analysis
6.5. Performing the Flexible Body Analysis
6.6. Using Component Mode Synthesis in the Multibody Analysis
6.7. Using Joint Probes
6.8. Comparing Processing Times
6.9. Input Files Used in This Analysis
7. Troubleshooting a Flexible Multibody Analysis
7.1. Addressing Overconstraint Issues During Modeling
7.1.1. Overconstraints in Rigid Bodies
7.1.2. Overconstraints Caused by User-Defined Constraint Equations
7.2. Resolving Overconstraint Problems