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Project Readiness Package Rev 7/22/11

MSD Continuation Interest:

(not interested) 0--------1--------2--------3---------4----------5 (very interested)

Assuming a “3” rating is a neutral stance on continuing the project, I would put my interest around a level four. I am not married to the project (I would not be devastated if the project did not run), but I would not be opposed to continuing the project as team lead.

My personal interest for a senior design project is one that has an electrical base and requires product design mechanical engineering skills (such as the enclosure design described in this proposal).

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INTRODUCTION:The primary objective of this Project Readiness Package (PRP) is to describe the proposed project by documenting requirements (customer needs and expectations, specifications, deliverables, anticipated budget, skills and resources needed, and people/ organizations affiliated with the project. This PRP will be utilized by faculty to evaluate project suitability in terms of challenge, depth, scope, skills, budget, and student / faculty resources needed. It will also serve as an important source of information for students during the planning phase to develop a project plan and schedule.

ADMINISTRATIVE INFORMATION:

Project Name (tentative): Hearing Aid Redesign – Team 1 Project Number, if known: XX

Preferred Start/End Quarter in Senior Design:

Faculty Champion:

Name Dept. Email PhoneGeorge Slack EE [email protected] 581-475-5105

Other Support, if known:

Name Dept. Email PhoneLawrence Scott NTID [email protected] 518-475-6970

Project “Guide” if known: Unknown

Primary Customer:

Name Dept. Email PhoneEddie Mc Bride NTID [email protected] unknown

Sponsor(s):

Name/Organization Contact Info. Type & Amount of

Support Committed

TO BE CONFIRMED RIT RESEARCH

http://www.rit.edu/research/srs/news/index.php?option=com_content&view=article&id=499:call-for-proposals-in-effective-access-technology&catid=140:research-news-stories&Itemid=228

Applied for research grant 11/12

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Fall/Winter Fall/Spring Winter/Spring

mailto:[email protected]

mailto:[email protected]


PROJECT OVERVIEW:

The product outlined by this document is an expansion of a concept developed by an RIT Industrial Design team during the Spring 2012 quarter. The design students are looking to work with engineering senior design teams during the winter/spring senior design block to turn their concept into a reality. This project readiness package provides a detailed explanation of the design teams goals and product concept. The senior design students assigned to this project are encouraged to provide feedback, expand, refine, and improve the product concept – student solutions are not limited to the original design proposal.

The product concept conceived by industrial designers Paula Garcia, Nick Kelemen, and Nanxi Yu, is an alternative design to the standard behind-the-ear style hearing aid device. The new design is intended to help change the social stigma currently shadowing hearing aids devices.

A hearing aid is an electronic audio amplification device worn by hard-of-hearing individuals. According to the National Institute on Deafness and Other Communication Disorders (NIDCD)*: only 1 out of 5 people who could benefit from a hearing aid actually wears one. The root cause of this statistic is unknown; based on preliminary research conducted by the design team, one can argue that potential users fail to use the device due to price, unattractive visual design, or as a result of the stereotype associated with hearing aid use. The product concept outlined in this proposal seeks to redefine the visual presence of hearing aid technology, and improve device functionality. The destigmatization of the device and integration with improved features will help increase the attractiveness of using a hearing device, thereby improving the quality of life of users.

The device concept proposed by the ID team, is an audio device that contains standard hearing aid functions, such as sound amplification, and features common on other audio devices such as a blue tooth headset or headphone used for music listening. The device requirements include the ability to recharge through a computer interface, reprogram-ability of the device functionality, and improved sound clarity in comparison to hearing aid products currently on the market. The long-term (10 year) goal of the proposed design is to develop a universal audio device that is used by both hearing and hard-of-hearing consumers. Universal is defined as a product design that appeals to both user groups (hearing and hard of hearing), both in design aspects and functionality. The short-term goal (20 weeks), intended for senior design engineering students: students are to deliver (1) a refined enclosure design optimized for user comfort, weight, and microphone location; (2) a computer interface software package that will allow users to download and edit sound processing software, and (3) a polished sound processing software for sound amplification and noise cancellation. Along with other customer needs, the delivered product is to include a rechargeable power source and reprogrammable circuitry.

Due to the complexity of the proposed design, this project is to be supported by two senior design teams. Team 1 is to be responsible for the enclosure design, computer interface, and data transfer capabilities. Team 2 is responsible for developing the sound processing software for the customer, and to determine the optimal location for the microphone placement. This project readiness package describes the tasks of Team one in detail.

*Source: http://www.hearingaids.com/quick-statistics/

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DETAILED PROJECT DESCRIPTION:

This project readiness package explores the deliverables for Team 1: the product enclosure design, rechargeable power, computer interface software, and data transfer capabilities. HEARING AID BACKGROUND:

The design of this product concept was based on improving the behind-the-ear style hearing aid. The behind-the-ear style hearing is the most widely used style. This style hearing aid locates the main enclosure, containing the device microphone, speakers, amplifier, battery power, and circuitry, of the device behind the users ear. The enclosure is connected through a clear tube to an ear mold that transmits amplified sound to the user (Figure 1). NOTE: The deliverable for this project is the enclosure only. The enclosure is to interface with a standard tube, but the tube and earmold are not to be changed.

Figure 1: Behind-the-Ear Hearing Aid

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ID CONCEPT:

Figure 1: Industrial Design Concept Proposal

The product concept, as proposed by the industrial design team, is a three part hearing assistant (Figure 1), and includes a computer software package, earpiece, and a transfer module.

Computer Software: one of the long-term goals developed by the industrial designers is to change the audiologist experience. Instead of physically visiting an audiologist for tuning or updates, the team would like to develop a software package that allows user to tune their own device, or download programs from their audiologist, and transfer the new data to the earpiece. Team A is to develop the computer interface that will complete this task. For this project, the deliverable is computer software that allows users to edit the sound processing software (developed by Team 2) and transfer these files to the earpiece via the transfer module.

Earpiece: the physical enclosure is intended to be a visual alternative to the behind-the-ear style aid. The inspiration for the shape of the enclosure was from current Bluetooth headset designs. By creating a product that is similar to a device commonly worn by hearing individuals, the hearing aid will not draw attention to the user because the form will no be unfamiliar to society. The enclosure contains all electronic components necessary to perform the task of sound amplification: microphones, speakers, processor, receivers, power, etc. Team 2 is responsible for the microphone location and sound processing software / electronics. Team 1 is responsible for improving the physical enclosure for user comfort and ergonomics. The earpiece must interface with the transfer module without impacting user experience.

Transfer Module: the transfer module is a floating component of this product system. The goal is to transfer power and data between the computer software and earpiece. The transfer module lives primarily in the users computer USB port, and is removed from the computer and attached to earpiece when the user needs to repower the earpiece or update the software on the earpiece. In an effort to maintain a small earpiece volume, the power storage available in the earpiece was compromised. The transfer module makes it easier for users to quickly recharge their earpiece without forcing the user to remove the device. When the earpiece power is low, users can attach the transfer module and repower the unit.

In parallel with this project, Team 2 will focus on the number of microphones and microphone locations. Additionally, the team will develop the sound processing software (sound amplification, noise cancellation, feedback calibration, etc.). It is unrealistic to have Team 1 and 2 work simultaneously and produce a working true size model. Therefore, the deliverable for the end of spring quarter is a proof of concept, an “on-the-table” hearing aid, where the electronics live outside the enclosure. A continuation project for this product concept would be to miniaturize the system and create a working prototype.

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Customer Needs and Objectives:

CN# Rank Customer NeedsCN1 9 The device is rechargeableCN2 3 The device is intuitive to the userCN3 3 The device does not draw attention to the userCN4 3 The power in the earpiece should last a minimum of 48 hours.CN5 9 The device communicates with a USB 2.0 portCN6 3 The weight of the device is similar to existing devices on the marketCN7 9 The device software is reprogrammableCN8 3 Device fits the 10th-90th percentile of adult ears

Stake Holderso ID Team (Paula Garcia) o MSD Student Teamo MSD Selection Committee o End User (hard of hearing)o End User (hearing) o Audiologist o Hearing Aid and Audio Device manufacturers

Functional Decomposition: (See Attached)

Specifications (or Engineering/Functional Requirements):

Specification (metric) Unit of Measure

Ideal Value

CN

1

CN

2

CN

3

CN

4

CN

5

CN

6

CN

7

CN

8

S1 Time to charge earpiece minutes <30S2 Time to charge transfer module minutes <30S3 Time to transfer data to earpiece minutes <5S4 Time to transfer data to transfer module minutes <5S5 Weight of earpiece grams <12S6 Weight of transfer module grams <8S7 Capacity of battery in earpiece Milliamp hours >130mhaS8 Capacity of battery in transfer module Milliamp hours >130mha

Students should prepare a product survey to be distributed to both hearing and hard-of-hearing individuals during the Imagine RIT festival. Students are to collect data regarding the new hearing aid design, the comfort, and the current perception of hearing aids. The survey is intended to poll the potential market and assess if the customer needs 3 and 8 are satisfied.

Constraints: o Product is to be low cost o Product is to be light weighto Product needs to be competitive with existing models o NOTE: Project is NOT constrained by the industrial design proposal, this is a starting point

for further innovation

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Potential Concepts: (See attached)

Project Deliverables: o An “on-the-table” hearing aid – due to the complexity of the product functions and size

constrains, this senior design team is not required to fit all electronics inside enclosure. The miniaturization of the product could be a continuation option for future teams.

o An ergonomically optimized earpiece prototype (design, weight, user interface); 3D model o Software and computer interface program

Budget Estimate: o Enclosure Development: 3D printing / modeling (Brinkmen Lab)

Contacted Devin Hamilton (Innovation Center) for a quote for using the rapid prototyping machine in the Innovation Center

Contacted John Bonzo for a quote for use of the CNC / 3D printers in the KGCOE Brinkman Lab

Price ($) SourceBattery DevelopmentUSB Connector Tape A Jack W/PCB Terminals 31.63 Mouser.com22-Gaurge Hookup Wire 9 radioshack.com60/40 Rosin Core Solder 15 Radioshack.comMiscellaneous Connectors 50 Mouser / Other(2x) 9V Battery 15 Radioshack.com+5V fixed voltage regulator 2 Radioshack.comUSB Male A to Female A Cable 5 Newegg.comEnclosure Development3D Printing Materials (per unit) 300 Brinkman Lab*Data Transfer DevelopmentRF Module 33.98 Mouser.comMiscellaneous Connectors 50 Mouser / OtherSD Card (16GB) 45 Mouser.comSD Card Reader 2 Mouser.comTotal Estimate 558.61

Intellectual Property (IP) considerations: o Current hearing aids on the marketo Industrial Design product concept credit

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STUDENT STAFFING:

Skills Checklist: [Attached]

Anticipated Staffing Levels by Discipline:

IDEAL STAFFING

Discipline How Many? Anticipated Skills Needed

EE 2 EE students will be concerned with device programing, battery power design and power management, data transfer, computer interface, etc.

ME 2 ME students will focus on enclosure design (ergonomics, prototyping, CAD, etc).

CE 1 CE students are to develop the computer software interface, USB communication, and assist TEAM B with program development.

ME HEAVY – due to the electrical focus of the project, there is no true ME heavy staffing solution. A team of all mechanical engineers may be able to model the hearing aid performance (battery power, sound processing, etc.) using MATLAB. Without an electrical support, the necessary required circuitry would not be obtainable. Additionally, without a CE, the USB communication would not be obtainable.

EE HEAVY

Discipline How Many? Anticipated Skills Needed

EE 4 EE students will be concerned with device programing, battery power design and power management, data transfer, computer interface, etc.

ME 1 ME students will focus on enclosure design

CE0 VERY DIFFICULT to complete project without a CE – EE students do

NOT have a standard background with USB and computer software integration according to research.

OTHER RESOURCES ANTICIPATED:Describe resources needed to support successful development, implementation, and utilization of the project. This could include specific faculty expertise, laboratory space and equipment, outside services, customer facilities, etc. Indicate if resources are available, to your knowledge.

Category Description Resource Available?

Faculty NTID Audiologists and sound specialists

Environment Audiology resources in NTID; hearing aid shop; hearing equipment, etc.

Equipment 3D printing or rapid prototyping resources (Brinkmen Lab) for enclosure dev.

Prepared by: Date:

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ENGINEERING ANALYSiS:

Can a USB port charge the required battery capacity in a reasonable amount of time? Yes, both the USB 2.0 and USB 3.0 ports paired with a battery of capacity size 675 will charge in under 22 minutes. Variation in charge time will depend on the chemical composition of the battery and the final size.

1.4 V = Hearing Aid battery voltage* (standard voltage)

640 mAh = battery size 675 capacity* (largest standard hearing aid battery size)

Total number of watt-hours of power available to device = (1.4V)*(640mAh) = 896 W-h

USB 2.0 Specs**: 5V supply, draw a maximum of 500mA = 2500 WUSB 3.0 Specs**: 5V supply, draw a maximum of 900 mA = 4500 W

Time to Charge (USB 2.0) = (896 W-h) / (2500 W) = 0.36 hours = 22 minutes Time to Charge (USB 3.0) = (896 W-h) / (4500 W) = 0.20 hours = 12 minutes

*http://1000bulbs.com/product/59015/BAT-L675ZA8ZM.html **http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power

What type of student is knowledgeable of programming with USB ports? According to Dr. Becker-Gomez, all CE students have taken courses in USB / computer interfacing. EE students will not have this background. *This project will most likely require a micro-USB.

What type of students are educated in battery control and design? According to Dr. B-G, the physical power management associated with battery design is strictly EE. The micro-controller that will control the battery functions is a CE skill, though EE’s may have slight knowledge.

Should we be concerned with the heat generation associated with the electronics? If the final deliverable were a working prototype in which all the electronic components were imbedded in the enclosure – heat generation would be a major concern. Due to the fact that this is a proof-of-concept proposal and the final deliverable is an “on-the-table” hearing aid, the heat generation is not a major constraint. The team should analyze and evaluate the safety of the device, but without miniaturizing the system there is no way to test / evaluate the electrical performance of the system (beyond an analytical model).

CE skill set includes: interfacing with computers (such as USB ports); imbedded systems; and software or programming in electrical systems; signals; data processing; programming in matlab and C.

EE skill set includes: physical board design; imbedded systems; power management; DSP? Can the parts be designed to fit in the ID enclosure? No, during this iteration it is unlikely that a student team can design, debug, and miniaturize the system. The teams should focus on completing the tasks, and storing the electronics outside the physical enclosure. The enclosure will be modified by Team 1 to optimize the ergonomic shape and finalize the interface method of the earpiece and transfer module. Team 2 will use the enclose to test various microphone locations for optimization. The second phase of

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the MSD project would be to combine both projects and minimize the electronics to fit the parts into the enclosure.

Is there an enclosure to work with? Yes, the ID team created a solid works model of the proposed enclosure. This file can be used to 3D print or CNC in the Brinkman Lab. ID or ME students will be able to modify the enclosure using solidworks or ProE.

Is the weight constraint feasible? For this iteration, the weight is most likely not a specification that can be met. Due to the fact that the electronics will not be miniaturized, the weight calculation cannot be made. It is possible that the teams work together and finalize the parts and part sizes that would be included in the final model, therefore a CAD model could be designed and a weight could be estimated.

Overall, is this project feasible? Yes. However, this project CANNOT be completed without the support of a CE AND EE student. A design-focused ME student can replace the need for an ID student and possibly replace the ergonomic knowledge of an IE student.

Is it feasible to ask students to fit the electronics in the small enclosure? No, it is unrealistic that a senior design team could design all the electronics for a working prototype and miniaturize the system to successfully fit in the earpiece enclosure. This PRP does not require a miniaturized system. The deliverable for this project is an “on-the-table” working prototype – the electronics can live outside the enclosure and connect via wires. The miniaturizing of the system would be an example of an opportunity for continuation.

What is Team B working on? The partner senior design team will be working on the hearing aid sound processing performance. The team will be focused on determining what frequencies are typically lacking in sound spectrum for a hard-of-hearing individual. We recognize that this there is an insane amount of variability in the hearing ranges; therefore the team will focus specifically on the student customer and their personal audiogram results and needs. Through microphone and sound collection, the team will develop programs to process / amplify the frequencies into the audible range for the customer. Additionally, the team will have to evaluate feedback, noise, and other issues with sound processing.

Additional Support: Refer to EDGE website for additional information on developer kids, DIY (do-it-yourself) battery and flash drive devices.

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CONCEPT PITCH1: Docking Station

Students are to develop am external docking station that allows hearing aid unit to dock and wirelessly charge.

Similar Products: wireless phone

Pro:- technology exists on market, goal is obtainable- requires multiple disciples Con: - project may not be attractive to MSD students because it

already exists- is not exactly inline with ID goals

____________________________________________________________________________

CONCEPT PITCH2: USB Charge

Student are to develop a hearing aid unit that charges through a USB cable, similar to a smatphone or electronic device.

Pro: - technology exists on market, goal is obtainable- requires multiple disciples

Con:- project may not be attractive to MSD students because it

already exists- is not exactly inline with ID goals

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CONCEPT PITCH3: Magnetic Connections

Design a magnetic interface between the earpiece and transfer module. This connection will be the location of energy and data transfer.

Pro:- easy to attach and breakaway - good visual Con: - may not be possible to transfer power / data through a

magnetic surface - difficult to attach transfer module to computer USB

port; would require an additional adapter. ____________________________________________________________________________

CONCEPT PITCH4: Wireless Transfer

Student are to develop a hearing aid unit that charges and transfer data wirelessly

Pro: - eliminates need to transfer module - less parts required to fabricate

Con: - interference with frequencies / other electrical signals - feasibility unknown

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APPENDIX X: Benchmarking

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APPENDIX X: Price Benchmark

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Appendix (PRP): Skills Checklist

Project Name (tentative):

Hearing Aid – Team 1

Checklist Completed by (name):

Alissa Anderson

For each discipline, indicate which skills or knowledge will be needed by students working on the associated project, and rank the skills in order of importance (1=highest priority). You may use the same number multiple times to indicate equal rank.

Mechanical Engineering

1 3D CAD Aerodynamics2 MATLAB programming CFD

Machining (basic) BiomaterialsStress analysis (2D) VibrationsStatics/dynamic analysis (2D) Combustion enginesThermodynamics 3 GD&T (geometic dimensioning &

tolerancing)Fluid dynamics (CV) Linear controlsLabView (data acquisition, etc.)

Composites

Statistics 3 DFM (potential)Robotics (motion control)

FEA 3 Composites1 Heat transfer Other:3 Modeling of electromechanical

& fluid systemsOther:

Fatigue & static failure criteria (DME)

Other:

Specifying machine elements

Reviewed by (ME faculty):

Industrial & Systems Engineering

Statistical analysis of data – regression

Shop floor IE – methods, time study

Materials science Programming (C++)Materials processing – machining labFacilities planning – layout, material handling

DOE

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Production systems design – lean, process improvement

Systems design – product/process design

3 Ergonomics – interface of people & equipment (procedures, training, maintenance)

Data analysis, data mining

Math modeling – linear programming), simulation

Manufacturing engr.

Project management DFx -- Manuf., environment, sustainability

Engineering economy – ROI Other:Quality tools – SPC Other:Production control – scheduling Other:

Reviewed by (ISE faculty):

Electrical Engineering

1 Circuit design: AC/DC converters, regulators, amplifier ckts, analog filter design, FPGA Logic design, sensor bias/support circuitry

Digital filter design and implementation, DSP

1 Power systems: selection, analysis, power budget determination

2 Microcontroller selection/application

System analysis: frequency analysis (Fourier, Laplace), stability, PID controllers, modulation schemes, VCO’s & mixers, ADC selection

2 Wireless protocol, component selection

1 Circuit build, test, debug (scopes, DMM, function generators)

Antenna selection (simple design)

Board layout (some students) 1 Communication system front end design

MATLAB (some proficiency) 1 Algorithm design/simulation

PSpice 1 Embedded software design/ implementation

Programming: C, Assembly (some proficiency)

Other:

1 Electromagnetics (shielding, interference)

Other:

Other:

Reviewed by (EE faculty):

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Computer Engineering

Digital design (including HDL and FPGA)

Wireless networks

1 Software for microcontrollers (including Linux and Windows)

Robotics (guidance, navigation, vision, machine learning, and control)

1 Device programming: Assembly language, C

Concurrent and embedded software

1 Programming: Java, C++ Embedded and real-time systems

1 Analog design Digital image processingNetworking and network protocols Computer visionScientific computing (including C and MATLAB)

Network security

Signal processing Other:Interfacing transducers and actuators to microcontrollers

Other:

Other:

Reviewed by (CE faculty):

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