Demonstration Presentation Final
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Transcript of Demonstration Presentation Final
Maroon (and Gold) 4Band-in-a-Box
Team 13
Presented By:
Benjamin Pacholl Christopher BrownJack Linke Michael Myer
Introduction
With the band Maroon (and Gold) 4’s upcoming tour fast approaching, we were presented with the problem of designing four unique instruments for the band to use on tour. We set out to solve this problem by focusing on a design that addressing the following criteria:
Quality Acoustics
Aesthetics
Portability
Cost Effectiveness
Our design includes four instruments Mini Pipe-Organ
Xylophone
Harp
Flute
Basic Physics of Wind Instruments
Pipe length determines output frequency.
Longer pipe = longer wave = lower frequency
Shorter pipe = shorter wave = higher frequency
𝑓𝑝=𝑛𝑣𝑋 𝐿(Frequency Formula) (Length formula)
(End Effect Correction ) Lactual = L theoretical – (61% x inside radius)
• f= fundamental frequency • v = speed of sound in air (343.5m/sec) • p = harmonic number (1 for this project)
• n = the mode number. (1 for this project)
• L= length of pipe (in meters)• Inside Radius 0.0064 meters• X = Length multiplier (closed pipe: 4, open
pipe: 2)
𝐿=𝑛𝑣𝑋 𝑓𝑝
Physics of String Instruments
String Instrument Equation:
T = Tension of the string in Newtons
= Linear mass density of the string
L = Length of string in meters
Rearranged to calculate lengths:
String Length, Tension, and Linear Mass Density determine the frequency of a string
Longer String = Lower Frequency
Lower Tension = Lower Frequency
Higher Linear Mass Density = Lower Frequency
Physics of Percussion Instruments
A xylophone is works by supporting bars of aa rigid material (i.e. wood or metal). When each bar is stuck, it vibrates and gives off a tone. This tone varies by the material type, thickness, and length.
Frequency Equation:
𝑓𝑛=𝑝𝑖𝐾𝑣8𝐿2
• f= fundamental frequency • v = speed of sound in pine wood (3300 m/sec) • K = harmonic number (bar thickness/3.46 for this project)• n = the mode number. (1 for this project)• L= length of pipe (in meters)
Discussion: Mini Pipe Organ
Frequency Range: 293Hz (D4) – 698.45Hz (F5)
Cost: $13.60
Design Characteristics
Easy to play
small and compact
14” X 14” X 6”
Future design improvements
Larger air chamber, increased airflow
More rigid back of frame
Removed ¼ PVC tube, increased airflow
Discussion: Harp Frequency Range: 220Hz (A3) – 523.25Hz (C5)
Cost: $12.30
Design Characteristics
Each string can be tuned
Small and compact
15” X 7” X 1.5”
Every note between A3 and C5 is represented
Future design improvements
1/2” threaded rod vice 3/8” threaded rod
Design for higher voice (using thinner strings)
Discussion: Flute Frequency Range: 220Hz (A3) – 523.25Hz (C5)
Cost: $10.14
Design Characteristics
Adjustable key locations
Small and compact
16” X 6” X 2”
Easy to play
Future design improvements
More rigid keys
Discussion: Xylophone
Bar lengths between 6.22 and 10.77 inches
Frequency Range from 87 Hz to 262 Hz
14 Note bars cover low voice required for the ASU Fight Song
Originally started as a set of cowbells, but design limitations made the xylophone much more effective in terms of cost, construction, and space within the box.
Final cost was lower since some specified materials were not necessary: $9.80
An improvement to the design could include resonator tubes underneath each bar length to increase the volume of the instrument.
Project Budget
Project Cost Target: $60 ($15/instrument)
Proposed Budget: $38.99
Final Budget: $45.84
+/- From Target: -$14.16
Final BudgetInstrument Cost
Pipe Organ $ 13.60
Xylophone $ 9.80
Harp $ 12.30
Flute $ 10.14
Total $ 45.84
Music Demonstration
We recorded the ASU Fight Song for our presentation
An excerpt of the recording is provided here
Full recording available online
Conclusion
Our Instrument designs: Play the ASU fight song
Fits easily in 2ft x2 ft. x2 ft. Box
Under Budget
Uses less than 10 ft. of pipe
Less than 6 ft. of string
Unique designs
Have unique and quality sound
Look great
References
ASU. Blackboard Learn. Accessed June 15, 2015. https://myasucourses.asu.edu/.
Bugman13. "PVC Pipe Organ." Instructables.com. Accessed June 15, 2015. http://www.instructables.com/id/PVC-Pipe-organ/.
"EFunda: Properties of Stainless Steels Details." EFunda: Properties of Stainless Steels Details. 2015. Accessed June 15, 2015.
Phil Medina “Waves and Vibrations.” Accessed July 3, 2015 http://www.mrsciguy.com/Physics/Waves.html. Accessed July 3, 2015