Design a Soundproof Room

Students relate science to engineering as they examine properties of sound and apply this knowledge in order to design a soundproof room—a practical application that acoustical engineers may perform in their work. The students employ the engineering design process and are given a range of materials to choose from. As students design their soundproof rooms, they are also limited by several constraints that acoustical engineers may encounter; they must work with a finite number of materials and must stay within a budget.

After this activity, students should be able to:

• Apply their knowledge of sound to a real-life situation.
• Evaluate materials for their design using quantitative data.
• Design a soundproof box using the engineering design process.

Students should complete the Decibels and Acoustical Engineering lesson and What Soundproofing Material Works Best? activity prior to this activity.

(Show slides 15 and 16 from the Soundproofing Material PowerPoint Presentation (PPTX).)

Now that we’ve learned about sound and explored the properties of a select number of materials, you are going to take on the role of acoustical engineers faced with a new design challenge. Your new school is under construction and the architect accidentally put the music room next to the library! In your groups, design a room that will absorb the most amount of sound so that students playing music do not disturb those reading in the library.

Your groups will create a design inside a box that will decrease the decibels measured from the outside of the box. Just like real acoustical engineers, you’ll follow the engineering design process and work within a set number of constraints. Each group has a materials budget of only $15, so make sure to choose your materials wisely! Use your prior knowledge of how different materials interact with sound to create a soundproofed music room!

Background

Refer to the Soundproofing Material PowerPoint Presentation (PPTX) to review information on acoustical engineering and the science of sound.

Before the Activity

• Complete the What Soundproofing Material Works Best? activity
• Download both apps from the App store
• • Tone Generator
  • Decibel X: dB, dBA Noise Meter
• Buy all necessary materials
• Set up materials in a central location; a “store,” where students can easily access them while building their soundproof rooms.   

With the Students

1. Introduce the activity and design challenge the students will need to complete (See Soundproofing Material PowerPoint Presentation (PPTX), slide 15).
2. Pass out the Post-Introduction Assessment (PDF).
3. Explain to the class that each group will be given a budget of $15 to design their soundproof room.
4. Show students the “store” where they will buy their materials to design their soundproof room. The Post-Introduction Assessment (PDF) lists all the materials with a price. The materials list also tells the students how much material they are allowed to buy per group. (A discussion about constraints in the engineering design process would fit well here, if time allows. This constraint is explained in Slide 16 in Soundproofing Material PowerPoint Presentation (PPTX)).
5. Provide the class with ideas to jumpstart the brainstorm process (Show Figure 1 and Figure 3 as an example).
6. Provide students with extra copies of materials list so they can sketch out different budgets while brainstorming.
7. Tell students to brainstorm three different ideas individually about what would be the best way to soundproof their music room. They will write their brainstorm on the Post-Introduction Assessment (PDF).
8. Assign students to groups for the challenge and instruct students to bring their best individual design with them to their group.
9. Instruct them to collaborate with their groups about which individual brainstorm, or combination of, is the best design for their soundproof room and record this within the Post-Introduction Assessment (PDF).
10. Students decide on the best design within their group and fill out their final budget (see Figure 2).

Figure 2. Students fill out their budget sheets.CopyrightCopyright 2017 Emma Cipriani, Natalie Jackson, Geanna Schwaegerle, and La’Nise Gray, Collaborative RET: University of Dayton, Central State University and Wright State University in Ohio.

11. Approve of their design, and move on to the construction process.
12. Allow students to visit the materials “store” and “purchase” materials based on their budget ($15 per group).
13. Have students ACE (answer, cite, and explain) the following question in the Post-Introduction Assessment (PDF) after they have chosen their design: Explain why you picked specific materials for your soundproof room design based on the previous activity and the collected data.
14. Instruct students to test their empty boxes with sound to measure the decibels as a baseline.  Make sure that the testing is all performed in the same location.

• • App to test: Tone Generator, found at the (App Store for free)
  • Decibel meter: Decibel X: dB, dBA Noise Meter (App store for free)
  • Note: testing environment must be quiet in order to get an accurate reading. 
  • Test with the box face down on the table.
  • Put one phone inside the box with the Tone Generator on; place the box face-down on the table.
  • Use Decibel X outside the box to measure the sound generated from the Tone Generator.
  • Note: you can substitute the Tone Generator for music from iTunes or a similar music app. Playing music will give it the feel of a music room. However, if you use music there will be variations in amplitude and this may affect the decibel reading.    

15. Tell students to record their baseline data on the Post-Activity Assessment (PDF).
16. Allow the students to start building their designs. (Refer to Figure 1 or Figure 3 again as example designs.)

• • There are no limits on layers of material for this activity. Encourage students to try to build using all the supplies they purchased.

17. With the teacher’s assistance, repeat step 12 and measure the decibels from a completed design.
18. Have students record their data on the Post-Activity Assessment (PDF).
19. Each group will place their information on the board so the class can analyze the information. Place all group names on the board so that each group can fill in their data table. (Using a collaborative Google doc may also help with data collection.)
20. Guide students through creating a bar graph with the collected data.

• • y-axis = decibel reading (in amps)
  • x-axis = group names
  • Title: For example, “Decibel readings of soundproof rooms”
  • Change in decibel reading; subtract the initial reading taken inside the empty box from the reading taken inside the constructed design.

21. Students and teacher will analyze data and answer critical thinking questions about the graph in the Post-Activity Assessment (PDF).
22. Lead a discussion as to why a certain group’s design worked and why another group’s design may have needed further iteration. In the discussion, discuss a given material’s ability to absorb, reflect, or transmit sound. Use the Soundproof Rubric (PDF) to help guide the grading process.

Figure 3. Examples of student groups’ final designs.CopyrightCopyright 2017 Geanna Schwaegerle, Collaborative RET: University of Dayton, Central State University and Wright State University in Ohio.

Pre-Activity Assessment

Motivational Activity: Complete motivational activity/hook with students.

1.  Use Slide 13 of the Soundproofing Material PowerPoint Presentation (PPTX) to present students with the activity. You may also have students groups research one of the following readings, “Movie Sound Effects”, “Sounds Trivia”, “Moving Sound: The Doppler Effect” (see Additional Multimedia Support).
2.  Once students begin reading, begin making noise with some kind of instrument (this will vary).
3.  Hold discussion about how this noise would affect learning within the classroom.

• 1. Questions (listed on Slide 14 of the PowerPoint):
• • • How would you feel if you had to listen to these loud noises each time you were trying   to read a book or article?
    • Would this affect your concentration?
    • How would your grades be affected from the constant noise?

Activity 2 Embedded Assessment

Assessments: Students should complete the Post-Introduction Assessment (PDF) and the Post-Activity Assessment (PDF).

Post-Activity Assessment

Rubric: See the Soundproof Rubric (PDF) to grade students on their performance during the activity.

• Remind students about the importance of using scissors properly in the classroom.

• Ask students and teachers to collect boxes prior to the activity.
• Have the materials store set up prior to starting the activity with each material labeled.
• Teacher can be the official “tester” (place the phone flat on the side of the box; choose the exact same orientation for each test to reduce the variables added into testing).
• Use two phones; one to play the Tone Generator (or a music app) inside the box and the other to measure the decibel reading from outside the box.