Simulation Quiz 4

Linear Dynamics using Ansys Mechanical - Simulation Quiz 4

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1 / 10

The Response PSD Tool is generally considered more accurate and versatile than using the Response PSD Probe. Select two options below that are correct.

The Response PSD Tool supports specifying the number of cluster points at each natural frequency.

The Response PSD Tool supports scoping to surfaces and bodies to obtain peak response PSD values.

The Response PSD Tool allows users to include results at any frequency within the PSD frequency range

The Response PSD Tool performs calculations differently compared to the Response PSD probe; it uses the Segalman-Reese method, which is known to be more accurate.

2 / 10

What is the RMS value of relative Y-Displacement Response PSD at vertex A when base motion is not included? Please select the best response closest to the answer for this model.

4 mm

0.5 mm

2.1 mm

1 mm

3 / 10

Which one of the following statements is correct about this random vibration analysis? Please select the best response.

The 3-sigma direction deformation results show the maximum possible value experienced by the assembly.

The 1-sigma direction deformation results show the maximum possible value experienced by the assembly.

Maximum directional deformation of the assembly will decrease with increasing confidence interval

Maximum directional deformation of the assembly will increase with increasing confidence interval

4 / 10

Which of the following statements are correct for Force Reaction probe of the Fixed Support of this model? Please select the two best options that are correct.

Only a Response PSD tool can be used to obtain the correct force reaction.

The force reaction result is statistical in nature.

The force reaction result is deterministic in nature and equal to the applied loading

One needs to use a force reaction probe.

5 / 10

What is the magnitude of the total deformation of thise structure due to the input random excitation ? Please select the best answer

0.5 mm

60 mm

2 mm

Cannot be determined since random vibration output is statistical and not deterministic

6 / 10

Which of the following is true regarding the directional deformation results? Please select the best response

1-Sigma results hasve the highest probability of occurrence compared with 2-sigma and 3-sigma results.

3-sigma results may be lower than 1-sigma results, so it is best practice to review 1-sigma, 2-sigma, and 3-sigma results.

1-sigma, 2-sigma, and 3-sigma results are independently calculated.

The trend seen for 1-sigma directional deformational results will be seen the same for 3-sigma results as well

7 / 10

Which of the following are true when you change the Clustering Frequency Points in the Details of the Response PSD Tool? Please select the two best responses that are correct..

By default, Mechanical clusters points about the natural frequencies and the number of points will change is made in the Details of Response PSD Tool.

Clustering Frequency points increases the number of modes extracted in the modal analysis.

It will increase the frequency range of the input PSD acceleration in this example.

The clustering of frequency points gives better accuracy than using evenly spaced intervals.

8 / 10

Review the 1-sigma directional deformation results in the Y and Z directions. Select the best option below that is a correct statement.

The maximum 1-sigma X directional deformation is larger than the maximum 1-sigma Y directional deformation, and this is expected since the holder has the smallest bending stiffness in that direction.

The maximum 1-sigma Z directional deformation is larger than the maximum 1-sigma Y directional deformation, indicating a problem in the model setup.

The maximum 1-sigma Y directional deformation is larger than the maximum 1-sigma Z directional deformation, and this is expected since excitation is in the Y direction.

The maximum 1-sigma Z directional deformation is larger than the maximum 1-sigma Y directional deformation, but this is expected due to the geometry and excitation direction.

9 / 10

What is the value of maximum acceleration RPSD in Y-direction at a location on the faces on which the input excitation is applied? Please select the best response closest to the answer for this model

4.8e6 (mm/s2)2/Hz

9.6e6 (mm/s2)2/Hz

4.8e7 (mm/s2)2/Hz

2e7 (mm/s2)2/Hz

10 / 10

Based on 1-sigma directional deformation results of this model, which two of the following statements are true? Please select the two best responses.

There is a 68.3% probability that deformation magnitude in the Y-direction will be less than or equal to 1.16 mm.

There is a 68.3% probability that deformation magnitude in the Y-direction will be less than or equal to 0.63 mm.

There is a 68.3% probability that deformation magnitude in the Z-direction will be less than or equal to 1.47 mm.

There is a 68.3% probability that deformation magnitude in the Z-direction will be less than or equal to 0.65 mm.

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Linear Dynamics Using Ansys Mechanical

Total Available Time - 30 mins

Total Number of Questions - 10