bangarang musical engineering university of notre dame department of aerospace and mechanical...
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Bangarang Musical Bangarang Musical EngineeringEngineering
University of Notre Dame University of Notre Dame Department of Aerospace and Mechanical Department of Aerospace and Mechanical
EngineeringEngineeringGroup Members: Roberto Ayala, Ryan Bradley, Pat Group Members: Roberto Ayala, Ryan Bradley, Pat
Fox, Matt Medlock, Mike Tieu Fox, Matt Medlock, Mike Tieu
Outline of PresentationOutline of Presentation
Project Overview and ObjectivesProject Overview and Objectives Concept SelectionConcept Selection Identification of Technical Challenges and Identification of Technical Challenges and
Feasibility IssuesFeasibility Issues Prototype Creation Prototype Creation Feasibility AssessmentFeasibility Assessment ConclusionsConclusions
Project ObjectivesProject Objectives
Task: Develop an innovative musical Task: Develop an innovative musical instrumentinstrument
Requirements:Requirements:
-- Play in an automated and manual -- Play in an automated and manual fashionfashion
-- Utilize embedded intelligence-- Utilize embedded intelligence
Concept SelectionConcept SelectionInitial Concepts and Design ConsiderationsInitial Concepts and Design Considerations
Air Guitar ConceptAir Guitar Concept Fan Sound GenerationFan Sound Generation
Key Design Considerations for Final ConceptKey Design Considerations for Final Concept
-- Enable disabled people to play a new instrument-- Enable disabled people to play a new instrument
-- Generate mechanical sound-- Generate mechanical sound
Concept SelectionConcept SelectionTarget Market IdentificationTarget Market Identification
Initial Target Market: People suffering from motor-Initial Target Market: People suffering from motor-skill skill disabilitiesdisabilities
Confirmed from meeting with physical therapist Confirmed from meeting with physical therapist
-- “Call-and-response” method of rehabilitation-- “Call-and-response” method of rehabilitation
Target market now includes neuro-rehabilitiation Target market now includes neuro-rehabilitiation capabilitiescapabilities
Concept SelectionConcept SelectionFinal Design ConceptFinal Design Concept
Group chose to pursue a mechanically operated drum setGroup chose to pursue a mechanically operated drum set
Features:Features:-- Two Drums Sticks-- Two Drums Sticks
-- Two Actuators-- Two Actuators
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility IssuesIssues
Drum stick actuating mechanismDrum stick actuating mechanism
-- Solenoid Selection-- Solenoid Selection Selection of pressure sensorsSelection of pressure sensors Drum stick material selectionDrum stick material selection Minimizing system response timeMinimizing system response time Generating variable volumeGenerating variable volume
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility IssuesIssues
Selection of Drum Stick ActuatorSelection of Drum Stick Actuator
Five actuating options considered:Five actuating options considered:-- solenoid, linear motor, rotary/servo motor, -- solenoid, linear motor, rotary/servo motor,
stepper motor, pneumatic systemsstepper motor, pneumatic systems
Merit based comparison:Merit based comparison:-- cost, estimated response time, durability, -- cost, estimated response time, durability,
variable force controlvariable force control
Selected a push solenoid as the actuating Selected a push solenoid as the actuating mechanismmechanism
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility
IssuesIssues Solenoid SelectionSolenoid Selection Investigate stick tip velocity and actuation force through two Investigate stick tip velocity and actuation force through two
trade trade studies studies
Requirements:Requirements:-- 65 dB of sound output-- 65 dB of sound output-- Stick tip velocity of 7 ft/s-- Stick tip velocity of 7 ft/s
Selected a solenoid with a stroke length of 1.0 ” and 5 lbf of Selected a solenoid with a stroke length of 1.0 ” and 5 lbf of pushing pushing forceforce-- Attached a spring with constant 3.34 lb/in to recoil stick-- Attached a spring with constant 3.34 lb/in to recoil stick
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility IssuesIssues
Pressure SensorsPressure Sensors
A trade study investigated the force exerted A trade study investigated the force exerted during during finger tapping finger tapping
Selected 0 to 1 lb pressure sensorsSelected 0 to 1 lb pressure sensors
Average Tapping Force (lbs)Average Tapping Force (lbs)
FingerFinger IndexIndex MiddleMiddle RingRing PinkyPinky
Force (lbs)Force (lbs) 0.2990.299 0.3630.363 0.3100.310 0.2600.260
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility Issues Issues
Drum Stick Material SelectionDrum Stick Material Selection
Study conducted in Study conducted in order to determine the order to determine the drum stick tip material drum stick tip material
Selected wood as the Selected wood as the materialmaterial-- Greatest slope-- Greatest slope
Velocity, Force, and Material StudyVelocity, Force, and Material Study
MaterialMaterial WoodWood ¾” ¾” steelsteel
¼” ¼” steelsteel
AlAl PlasticPlastic
Slope (dB-s/ft)Slope (dB-s/ft) 1.451.45 0.740.74 1.201.20 1.191.19 0.460.46
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility IssuesIssues
Minimizing System Response TimeMinimizing System Response Time
Electrical response from sensors was negligible (5 Electrical response from sensors was negligible (5 µs)µs)
Main contributor was mechanical responseMain contributor was mechanical response-- Solenoid push-- Solenoid push
-- Stick recoil-- Stick recoil
Key Technical Challenges and Feasibility Key Technical Challenges and Feasibility IssuesIssues
Generate variable volumeGenerate variable volume Desired to create three different volumesDesired to create three different volumes
-- Pressure Sensor-- Pressure Sensor
-- Microcontroller-- Microcontroller
-- DC Solenoid-- DC Solenoid
Utilized three Utilized three different different microcontroller microcontroller pins to output pins to output variable volume variable volume commandscommands
Prototype CreationPrototype CreationCAD ModelingCAD Modeling
CAD model created to visualize the CAD model created to visualize the prototypeprototype
Prototype CreationPrototype CreationCritical FunctionsCritical Functions
Will prove concept feasibility in the following areas:Will prove concept feasibility in the following areas:-- Generate variable volumes greater than 65 dB-- Generate variable volumes greater than 65 dB
-- Function both manually and autonomously-- Function both manually and autonomously
-- Operates at a minimum rate of 1 beat/s-- Operates at a minimum rate of 1 beat/s
Additional goals:Additional goals:
-- Robust design-- Robust design
Budget Requirements:Budget Requirements:-- Maximum $500-- Maximum $500
-- Actual Cost - $432-- Actual Cost - $432
Prototype CreationPrototype CreationManufacturingManufacturing
-- Striving towards a prototype with complete adjustability
Frame Mount
Clevis
Feasibility AssessmentFeasibility Assessment Prototype effectively demonstrated product feasibilityPrototype effectively demonstrated product feasibility Scored 95/100 on team-developed performance requirementsScored 95/100 on team-developed performance requirements
Prototype Strengths:Prototype Strengths:-- Pressure sensor effectiveness-- Pressure sensor effectiveness-- Minimum mechanical complexity-- Minimum mechanical complexity-- System response time-- System response time-- Packaging and presentation-- Packaging and presentation-- Robust-- Robust
Prototype Weaknesses:Prototype Weaknesses:-- Circuit assembly problems-- Circuit assembly problems-- Extra sound from solenoid actuation and contact with -- Extra sound from solenoid actuation and contact with mountmount-- Over weight limit-- Over weight limit
ConclusionsConclusions
Product has high market Product has high market potentialpotential
Group believes that Group believes that product will be successfulproduct will be successful
Prototype demonstrates Prototype demonstrates product feasibilityproduct feasibility
Final Product Changes:Final Product Changes:-- Drum size-- Drum size
-- Circuit design-- Circuit design
Questions Asked:Questions Asked: Question: How important was it to return the stick to its Question: How important was it to return the stick to its
original position?original position? The stick had to be returned to its initial position to be able The stick had to be returned to its initial position to be able
to change the volumes at which the drum played. If the drum stick to change the volumes at which the drum played. If the drum stick did not return to its initial position, the variable force firing of the did not return to its initial position, the variable force firing of the solenoid would have little to no effect on the stick tip velocity, thus solenoid would have little to no effect on the stick tip velocity, thus making it impossible to change the volume.making it impossible to change the volume.
Additionally, the stick had to return to its original position Additionally, the stick had to return to its original position because otherwise, it would not create sound. If the drum stick because otherwise, it would not create sound. If the drum stick remained in contact with the drum head, the firing of the solenoid remained in contact with the drum head, the firing of the solenoid would not generate sound. The stick would be driven through the would not generate sound. The stick would be driven through the drum head.drum head.
Question: How durable was the spring?Question: How durable was the spring? The spring was effective for our use. The design team feels The spring was effective for our use. The design team feels
that because of the spring constant, the durability of the spring that because of the spring constant, the durability of the spring would not be an issue.would not be an issue.
Question: How easy would it be to add components?Question: How easy would it be to add components? Adding components would be a significant challenge that Adding components would be a significant challenge that
would need to be thought out. By adding more components, the would need to be thought out. By adding more components, the weight of the design would be significantly increased, which would weight of the design would be significantly increased, which would cause the apparatus to be difficult to move around. Additionally, to cause the apparatus to be difficult to move around. Additionally, to fit the design through a set of doors, one could not extend the size of fit the design through a set of doors, one could not extend the size of the frame to include more components. This question requires much the frame to include more components. This question requires much more thought, and would need to be fully investigated if pursuing more thought, and would need to be fully investigated if pursuing the product.the product.
Question: Have you performed a patent search?Question: Have you performed a patent search? We have not performed a patent search. We are pursuing We have not performed a patent search. We are pursuing
undergraduate design competitions in an effort to get the design undergraduate design competitions in an effort to get the design noticed.noticed.