ACP ACP Inventor Nastran and Dynamic Simulation 1 — Questions and Answers
Question 1: In Inventor Nastran, what is the primary purpose of applying boundary conditions before running a simulation?
- To assign material properties to components
- To define how the model is constrained and loaded in the real-world scenario (Correct answer)
- To set the mesh element size
- To define contact between assembly parts
Correct answer: To define how the model is constrained and loaded in the real-world scenario
Boundary conditions define the physical constraints (fixed supports, applied loads) that represent the real-world environment of the analysis.
Question 2: In Inventor's Dynamic Simulation environment, which joint type allows rotation about one axis and translation along the same axis?
- Revolute
- Cylindrical (Correct answer)
- Slider
- Ball
Correct answer: Cylindrical
A Cylindrical joint allows both rotation about and translation along a single shared axis, combining two degrees of freedom.
Question 3: What does a 'convergence study' in Inventor Nastran verify?
- That the model geometry matches the CAD design intent
- That refining the mesh no longer significantly changes the simulation results (Correct answer)
- That all boundary conditions are properly applied
- That the material properties are correctly assigned
Correct answer: That refining the mesh no longer significantly changes the simulation results
A convergence study refines the mesh progressively to confirm that the solution (stress, displacement) stabilizes and is not mesh-dependent.
Question 4: In Inventor Nastran, which element type is most appropriate for simulating a thin-walled sheet metal bracket?
- Solid tetrahedral elements
- Shell elements (Correct answer)
- Beam elements
- Spring elements
Correct answer: Shell elements
Shell elements are used for thin-walled structures where the thickness is much smaller than the other dimensions, making them computationally efficient and accurate.
Question 5: In Inventor's Dynamic Simulation, what is the function of an 'imposed motion' constraint?
- It locks all degrees of freedom on a joint
- It drives a joint at a prescribed velocity, acceleration, or position over time (Correct answer)
- It applies a gravity force to the mechanism
- It defines the initial rest position of a component
Correct answer: It drives a joint at a prescribed velocity, acceleration, or position over time
Imposed motion drives a joint with a defined kinematic function (position, velocity, or acceleration) so the simulator follows a prescribed motion profile.
Question 6: Which Inventor Nastran analysis type calculates the natural vibration frequencies of a structure without external loads?
- Linear Static
- Normal Modes (Modal) (Correct answer)
- Nonlinear Static
- Frequency Response
Correct answer: Normal Modes (Modal)
A Normal Modes (Modal) analysis calculates the undamped natural frequencies and mode shapes of a structure.
ACP ACP Inventor Nastran and Dynamic Simulation 1
In Inventor Nastran, what is the primary purpose of applying boundary conditions before running a simulation?