Alibre Design

Chapter 19 - Alibre MotionFixed Parts“Anchored” Parts and Sub-Assemblies will always become Fixed Parts. The dynamics ofFixed Parts is not calculated, and they are used by Alibre Motion only when they areconstrained to Moving Parts, and for determining any Interferences or Collisions.Physical Characteristics of Parts And Sub-AssembliesThe physical characteristics of the moving parts in the simulation decide how they reactto forces and torques applied to them. Alibre Motion calculates these characteristicsdirectly from your existing Part and Sub-Assembly designs:• Location• Orientation• Mass - calculated from the Material specified• Location of the center of mass (aka center-of-gravity, or CG)• Moments of inertia• The position of each point at which another body or force can actAll of these are computed automatically by Alibre Motion from the Assembly, whenevera Simulation is generated. They come from the design of each part, and the constraintsin the Assembly.Tip: Ensuring that these characteristics are correct when designing your parts andassemblies is a crucial step in the process of producing accurate and useful simulations.19.6.5 Creating Simulations‣ To create a new simulation:1. In the Motion Explorer, right-click on the name of the assembly, and select NewSimulation. The New Simulation dialog appears.2. In Name, type a name for the new simulation.554