CSWP Motion Studies 5 — Questions and Answers
Question 1: What is the primary advantage of using 'Path Mate' in a Motion Study over manually keying positions along a curve?
- Path Mate automatically generates collision detection
- It constrains a component to follow a sketch curve, simplifying motion definition along complex paths (Correct answer)
- It converts the motion study to a structural FEA load
- It locks the component's orientation to world-up at all times
Correct answer: It constrains a component to follow a sketch curve, simplifying motion definition along complex paths
A Path Mate forces the component's reference point to stay on a defined sketch path, making curved-path animation straightforward without manually setting many key points.
Question 2: In Motion Analysis, which term describes the number of independent coordinates required to fully define the position of all bodies in the mechanism?
- Constraint rank
- Degrees of Freedom (DOF) (Correct answer)
- Modal frequency
- Eigenvalue count
Correct answer: Degrees of Freedom (DOF)
Degrees of Freedom (DOF) counts the minimum number of independent variables needed to describe the complete configuration of the mechanism.
Question 3: When setting up an 'Oscillating' linear motor in Motion Analysis using a data function, which input type would produce reciprocating motion?
- Constant value
- Step function
- Sine/Cosine expression (Correct answer)
- Random noise profile
Correct answer: Sine/Cosine expression
A sine or cosine displacement function causes the motor to move back and forth symmetrically, producing oscillating reciprocating motion.
Question 4: How do you prevent a component from participating in Motion Analysis dynamics while keeping it visible in the assembly?
- Assign it zero density in its material
- Fix it to ground using a Fixed constraint or a fully-defined Ground mate set in the study (Correct answer)
- Delete all mates to that component
- Change its display state to hidden
Correct answer: Fix it to ground using a Fixed constraint or a fully-defined Ground mate set in the study
Applying a Fixed (ground) constraint in the Motion Study makes the component immovable for the solver while leaving it visible.
Question 5: What does the 'Trace Path' tool in a Motion Study output?
- A video file of the moving component
- A 3D sketch curve tracing the path of a selected point during the simulation (Correct answer)
- A text report of joint forces
- A spreadsheet of frame-by-frame positions
Correct answer: A 3D sketch curve tracing the path of a selected point during the simulation
Trace Path generates a 3D sketch in the assembly that follows the trajectory of a chosen reference point throughout the motion study.
Question 6: Which statement correctly describes 'redundant constraints' in a Motion Analysis study?
- They are required for the solver to converge on a unique solution
- They occur when more mates than necessary restrict the same DOF, potentially causing solver warnings or inaccurate force results (Correct answer)
- They speed up computation by reducing the equation set
- They are only relevant in Animation studies, not Motion Analysis
Correct answer: They occur when more mates than necessary restrict the same DOF, potentially causing solver warnings or inaccurate force results
Redundant constraints over-constrain the mechanism; the solver may still run but joint force results can be unreliable because force is shared ambiguously among redundant constraints.
Question 7: When you change the 'Frame Rate' in the Motion Study Properties, what is the primary effect on a saved animation output?
- It changes how long the simulation runs
- It determines the number of frames captured per second in the exported video, affecting playback smoothness (Correct answer)
- It controls the solver integration step size
- It adjusts the gravity magnitude in the simulation
Correct answer: It determines the number of frames captured per second in the exported video, affecting playback smoothness
Frame rate sets how many frames per second are written to the exported video file, directly affecting the visual smoothness of playback.
CSWP Motion Studies 5
What is the primary advantage of using 'Path Mate' in a Motion Study over manually keying positions along a curve?