ACP ACP Inventor Nastran and Dynamic Simulation 3

Question 1

In Inventor Nastran, what is the purpose of mesh refinement controls applied locally to specific geometry features?

Accepted Answer

To increase mesh density in high-stress or geometrically complex regions for improved accuracy

Answer

To reduce the total number of elements in the model

Answer

To assign a different material to that region

Answer

To exclude that region from the analysis

Question 2

What does a 'frictionless' support boundary condition simulate in Inventor Nastran?

Accepted Answer

A surface constrained only in the direction normal to it, free to slide tangentially

Answer

A surface that is completely free to move in all directions

Answer

A surface with infinite friction preventing all tangential motion

Answer

A surface that has no material assigned to it

Question 3

In Inventor's Dynamic Simulation, which joint type replicates the behavior of a ball-and-socket connection with three rotational degrees of freedom?

Accepted Answer

Ball

Answer

Revolute

Answer

Cylindrical

Answer

Point-Curve

Question 4

What is the purpose of running a 'Linear Buckling' analysis in Inventor Nastran?

Accepted Answer

To determine the critical compressive load at which a slender structure may suddenly buckle

Answer

To calculate the maximum deflection under bending loads

Answer

To find the natural frequencies of a compressed structure

Answer

To measure thermal expansion under compressive loads

Question 5

In Inventor's Dynamic Simulation environment, what is the role of a 'damper' force element?

Accepted Answer

To resist motion by dissipating kinetic energy as a function of velocity

Answer

To store energy like a spring during compression

Answer

To apply a constant force in a fixed direction

Answer

To prevent two joints from rotating simultaneously

Question 6

When a simulation in Inventor Nastran shows high stress concentrations at a re-entrant corner, what is the recommended design approach to reduce them?

Accepted Answer

Add a fillet radius to the sharp corner to smooth the stress flow

Answer

Increase the applied load to redistribute stress

Answer

Apply a frictionless support at the corner location

Answer

Reduce the mesh element size only at that corner without design changes