Simulation Quiz 2

Methods of Solving Problems in Structural Mechanics - 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 / 15

If both ends of the cantilever are fixed, and the force is applied at the center, which one of the following statements is correct?

Insert fixed support in the Transient analysis setup.

Apply two forces one at the edge of the cantilever and one at the center but in opposite directions.

The model needs to be setup again from the modal analysis.

Insert frictionless support in the Transient analysis, this will be like modeling a symmetric boundary.

2 / 15

The model has a Force applied on the free end with 100 N acting in each of the X, Y, and Z directions. Select the option below that is a correct statement.

The force in the X-direction dominates the overall response.

The forces in X, Y, and Z are all equally important in the overall response.

The force in the Y-direction dominates the overall response.

The force in the Z-direction dominates the overall response.

3 / 15

When determining the transient results using the mode-superposition method, which modes are used by the solver in its calculations? Select the best option.

All the modes extracted in the modal analysis are used by the solver.

Only modes that have mode shapes in direction of deformation are considered.

The modes with maximum deformation in each X, Y, and Z direction are used.

Only six modes, corresponding to each degree of freedom, are used by the solver.

4 / 15

Which of the following is correct about this analysis?

Modal analysis is linear but transient analysis using modal superposition method is nonlinear.

The analysis will always be linear.

The analysis behavior is nonlinear.

The analysis behavior can be nonlinear when we include the nonlinearities.

5 / 15

Without modifying and resolving the model, a change in plate thickness has what effect on modal analysis results? Select the best option.

No effect.

Only the order of the mode shapes will change, but participation factors remain constant.

The order of mode shapes and the corresponding participation factors can change.

The order of the mode shapes always remains the same, but the corresponding participation factors can change.

6 / 15

Before performing the Mode Superposition Analysis, which of the following is always useful to perform? Select the best, most practical option.

Create a very fine mesh to obtain conservative results.

Extracting a very large number of modes to ensure that the structure’s dynamic response is adequately captured.

Checking ratio of effective mass to total mass from the modal analysis to see if enough modes have been extracted.

Extract only 6 modes to see if the system’s response can be captured with a small number of modes.

7 / 15

The applied force is not sinusoidal, but the Total Deformation response is oscillatory. Select the best option that explains why this happens.

Damping causes the response to be oscillatory in nature.

The size of the timestep determines the period of the oscillations.

Numerical simulation cannot approximate a triangular waveform, so the applied force is actually a series of harmonic excitations that cause oscillatory responses.

The natural frequency of the structure gets excited after the force is released, so the oscillations are due to the excitation of the mode.

8 / 15

Review the Reaction Forces at the Fixed Support for this model. Select the option below that is a correct statement.

The structure experiences a peak reaction force in the X-direction of 100 N.

The peak reaction force is about 140 N.

The structure has a higher reaction force in the Z-direction compared to the Y-direction.

The reaction force time-history response is identical to the time-history of the applied force.

9 / 15

Without modifying and solving the model again, consider an increase in the plate thickness. Select the best option that describes what happens to the Total Deformation response.

The period of the oscillations will decrease.

No changes in deformation response.

The period of the oscillations will increase.

The period of the oscillations will stay the same, but the amplitude will decrease.

10 / 15

The analysis used a damping ratio of 1%. If the damping ratio were increased to 5%, select the best option that describes the Total Deformation response.

The amplitude will not be affected by any change in the damping ratio.

The amplitude will increase slightly.

The amplitude will decrease more gradually.

The amplitude will decrease more quickly.

11 / 15

Without modifying and solving the model again, consider changing the material to one with twice the current mass density (geometry, loads, and all other material properties remain unchanged). Select the best option that describes what happens with this new density to the Total Deformation response.

The period of the oscillations will increase.

The period of the oscillations will decrease.

No changes in deformation response.

The period of the oscillations will stay the same, but the amplitude will increase.

12 / 15

If only three modes are used to calculate the maximum total deformation, then which mode shapes would provide the most accurate results? Select the best option.

1, 3, and 4

3, 4, and 5

1, 3, and 5

6, 7, and 8

13 / 15

Looking at the plot of maximum Total Deformation, which one of the following statements is correct?

The deformation increases due to a reduction in the structure’s stiffness.

The magnitude of deformation reduces over time due to damping.

The deformation decreases due to an increase in the structure’s stiffness.

The magnitude of deformation increases with time.

14 / 15

Without solving the model, what will the maximum directional deformation in the Y-direction be if the applied force in the Y-direction is -200 N? Assume that forces in the X- and Z-directions remain unchanged. Select the best option.

The maximum directional deformation in the Y-direction will be 4 times the deformation in the current case.

The answer cannot be obtained without solving the numerical model with -200 N applied in the Y-direction.

The maximum directional deformation in the Y-direction will be 1.4 times the deformation in the current case.

The maximum directional deformation in the Y-direction will be 2 times the deformation in the current case.

15 / 15

What is the maximum deformation seen during the transient analysis? Select the closest option.

~ 0.05mm

~ 0.1mm

~ 0.2mm

~ 0.04mm

Your score is

0%

Methods of Solving Problems

Cantilever Mode Superposition Analysis

Total Available Time - 45 mins

Total Number of Questions - 15