# Foundations in Linear Dynamics using Ansys Mechanical - Simulation Quiz 1

### Modal Analysis of a Tuning Fork

A tuning fork has two prongs forming a U shape. When hit against a surface, it emits a musical tone. The frequency of the tuning fork depends upon its stiffness and mass. Modal analysis can help determine the frequency of the tuning fork. Perform a modal analysis to determine the natural frequency of vibration of the tuning fork when held in hand at its base.

Follow the instructions to set up the simulation and get results BEFORE starting the quiz. Download the instructions and necessary simulation files from here.

Note: The Expected Completion Time for this quiz is 15 mins, but the Maximum Available Time to complete it is 30 mins.

Times up!

##### Foundations in Linear Dynamics using Ansys Mechanical - Simulation Quiz 1

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

In System A (“Steel”), which direction does not have its dynamic response properly characterized with 10 modes?

2 / 10

For System A (“Steel”), select two statements which are correct concerning the system response in the global z-direction.

3 / 10

Consider System B (“Copper”). For this tuning fork, the desired mode shape is shown below, where the tines (prongs) are vibrating in opposite motions toward/away each other. Select the correct statement below:

4 / 10

Review the third and sixth modes in System B (“Copper”). Select the correct statement below:

5 / 10

What is the first frequency of vibration for the steel tuning fork in System A (“Steel”)?

6 / 10

The Cumulative Mass Fraction reported for the highest extracted mode should _____. Select the best option to complete this sentence.

7 / 10

Compare the first four modes of System A (“Steel”) with System B (“Copper”). Select the correct statement below:

8 / 10

What is the frequency of the tenth mode for the steel tuning fork in System A (“Steel”)? Pick the closest option.

9 / 10

Consider System A (“Steel”). For this tuning fork, a region of interest for the 6th mode is highlighted in a dotted red oval below. Select the correct statement below:

10 / 10

Compare the modes of System A (“Steel”) with System B (“Copper”). Select the correct statement below: