Simulation Quiz 2

Linear Dynamics using Ansys Mechanical - Simulation Quiz 2

Complete the simulation and have all the results ready BEFORE starting the quiz.

Once you have finished the exam, click on the 'Mark Complete' button to save your progress and move to the next section.

1 / 10

Consider the case where only the first 3 modes were extracted from the modal analysis and used in the mode-superposition harmonic response analysis for this model. Select the best option that is correct regarding the frequency response plot of deformation.

The deformation trends would not be the same.

The deformation trends would be similar, but the magnitude will be higher since fewer modes are used.

The deformation trends would be similar, as the first mode is the most important mode.

The deformation trends would be similar, but the magnitude will be lower since fewer modes are used.

2 / 10

Consider the stresses calculated in the modal analysis for this model. Select the statement that is correct.

The modal analysis stresses for a given mode is the same value as the downstream harmonic response analysis at the same frequency of that mode.

The modal analysis stresses will change if there is a change in the harmonic loading.

Ansys Mechanical cannot calculate stresses in a modal analysis.

The modal analysis stresses are relative and are not actual values.

3 / 10

Which mode shape and corresponding natural frequency from Modal Analysis matches closely with the Directional Deformation result of Harmonic Analysis? Select the best option.

3rd mode shape

4th mode shape

2nd mode shape

5th mode shape

4 / 10

What is the minimum number of modes that needs to be extracted such that the ratio of effective mass to total mass along the direction of loading is at least 0.9? Select the best option.

6

3

13

2

5 / 10

From the Harmonic Response analysis, what is the frequency at which peak amplitude is observed? Select the option that is closest to the result you obtained.

70 Hz

200 Hz

600 Hz

500 Hz

6 / 10

If the magnitude of both the Force loads was increased by 100N, what would be its effect on the mode shapes and corresponding natural frequencies? Choose the best option without rerunning the model.

Mode shapes would remain the same, however, corresponding frequencies would change

Mode shapes and corresponding natural frequencies would remain unchanged with a change in the loading

Mode shapes would change, however, corresponding frequencies would remain same

Mode shapes and corresponding natural frequencies would change with change in the loading

7 / 10

From the Directional Deformation result, what is the absolute maximum amplitude of deformation reported when calculated with maximum spatial resolution? Select the option that is closest to the result you obtained.

7e-4 mm

7e-3 mm

1.1e-2 mm

2e-2 mm

8 / 10

Assume that both the loads were acting along the X-direction. Which mode shape from the Modal Analysis would have resulted in peak amplitude, considering all other parameters unchanged? Choose the best option without rerunning the model.

3rd mode shape

5th mode shape

2nd mode shape

1st mode shape

9 / 10

Consider the case if the 2 applied forces were acting in-phase for this model. Select the best option that would be a correct statement in this situation.

The frequencies of peak response would shift slightly higher.

Ansys Mechanical cannot solve multiple loads that are in-phase with each other.

The results would be unchanged if the loads are in-phase.

The model would need to be re-solved since the loading has changed.

10 / 10

Which of the following statements hold true with respect to the loads applied on this model? Select the 3 best options.

The 2 loads always act in opposite directions

The 2 loads are excited at the same frequency

The 2 loads are in phase with each other

The 2 loads are assumed to be sinusoidal

Your score is

0%

Linear Dynamics Using Ansys Mechanical

Total Available Time - 30 mins

Total Number of Questions - 10