Quiz - Mode Superposition Method | ANSYS Innovation Courses

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Question 1 of 10

1. Question
What is the fundamental assumption behind the mode superposition technique?
- 1) Response to any dynamic load can be expressed as a combination of mode shapes
- 2) Different modes can be scaled by different scale factors (called modal coordinates) based on the load values and their direction
- 3) The response is linear
- 4) All of the above
Question 2 of 10

2. Question
Using a linear combination of modes, one can solve dynamics problems including:
- 1) Harmonic analysis
- 2) Transient dynamics problems
- 3) Random vibration and response spectrum problems
- 4) All of the above
Question 3 of 10

3. Question
Compared to full harmonic analysis, the MSUP method:
- 1) Has the same accuracy because higher even with few modal shapes
- 2) Has similar accuracy when there is sufficient modal shapes considered
- 3) Has similar efficiency when the total degree of freedom gets large
- 4) Is always significantly faster even for small problems
Question 4 of 10

4. Question
The mode superposition method:
- 1) Expresses the displacement as a quadratic combination of mode shapes
- 2) Sum the mode shapes to approximate the final response
- 3) Does not require mode shape coefficients
- 4) Only need the first five mode shapes
Question 5 of 10

5. Question
Eigenvectors are important in the mode superposition method because:
- 1) Eigenvectors are scaled and combined to find the approximated displacement
- 2) Components of the eigenvectors are used as modal coordinates
- 3) Eigenvectors are directly added to approximate displacement in the mode superposition method
- 4) Eigenvectors are the basis of both dynamic and static problems
Question 6 of 10

6. Question
Why is the full method expensive?
- 1) It converts the equation of motion to modal form and adds extra computational cost
- 2) It requires a finer mesh and greatly increase the degree of freedoms
- 3) The unknowns are coupled and need to be solved simultaneously
- 4) The unknowns are imaginary nodal displacement and are hard to calculate
Question 7 of 10

7. Question
What is a reasonable number of modes to use in the MSUP method?
- 1) 5
- 2) 10
- 3) 100
- 4) Depends on the problem
Question 8 of 10

8. Question
What is the role of modal coordinates in the MSUP method?
- 1) It scales the eigenvector
- 2) It equals the nodal displacement
- 3) It equals the eigenvalues
- 4) None of the above
Question 9 of 10

9. Question
In the drone arm harmonic analysis, using the MSUP method gives a similar result with the full method because:
- 1) The material is linear
- 2) No large deflection is included
- 3) Sufficient modal shapes are chosen
- 4) All of the above
Question 10 of 10

10. Question
Which of the following statement about the equation of motion is true?
- 1) It governs the dynamic behavior of an object
- 2) It can be solved only in time domain
- 3) It can always be solved using the MSUP method
- 4) All of the above

Quiz - Mode Superposition Method

Quiz - Mode Superposition Method

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